/************************************************************************* * * * YAP Prolog * * * * Yap Prolog was developed at NCCUP - Universidade do Porto * * * * Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 * * * ************************************************************************** * * * File: iopreds.c * * Last rev: 5/2/88 * * mods: * * comments: Input/Output C implemented predicates * * * *************************************************************************/ #ifdef SCCS static char SccsId[] = "%W% %G%"; #endif /* * This file includes the definition of a miscellania of standard predicates * for yap refering to: Files and Streams, Simple Input/Output, * */ #include "Yap.h" #include "Yatom.h" #include "Heap.h" #include "yapio.h" #include #if HAVE_STDARG_H #include #endif #if HAVE_SYS_TIME_H #include #endif #if HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_STAT_H #include #endif #if HAVE_SYS_SELECT_H && !_MSC_VER && !defined(__MINGW32__) #include #endif #ifdef HAVE_UNISTD_H #include #endif #if HAVE_STRING_H #include #endif #if HAVE_SIGNAL_H #include #endif #if HAVE_FCNTL_H /* for O_BINARY and O_TEXT in WIN32 */ #include #endif #if HAVE_IO_H /* Windows */ #include #endif #if !HAVE_STRNCAT #define strncat(X,Y,Z) strcat(X,Y) #endif #if !HAVE_STRNCPY #define strncpy(X,Y,Z) strcpy(X,Y) #endif #if _MSC_VER || defined(__MINGW32__) #include #endif #if _MSC_VER || defined(__MINGW32__) #if USE_SOCKET #include #endif #ifndef S_ISDIR #define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR) #endif #endif #include "iopreds.h" STATIC_PROTO (Int PlIOError, (yap_error_number, Term, char *)); STATIC_PROTO (int FilePutc, (int, int)); STATIC_PROTO (int MemPutc, (int, int)); STATIC_PROTO (int console_post_process_read_char, (int, StreamDesc *)); STATIC_PROTO (int post_process_read_char, (int, StreamDesc *)); #if USE_SOCKET STATIC_PROTO (int SocketPutc, (int, int)); STATIC_PROTO (int ConsoleSocketPutc, (int, int)); #endif STATIC_PROTO (int PipePutc, (int, int)); STATIC_PROTO (int ConsolePipePutc, (int, int)); STATIC_PROTO (int NullPutc, (int, int)); STATIC_PROTO (int ConsolePutc, (int, int)); STATIC_PROTO (Int p_setprompt, (void)); STATIC_PROTO (Int p_prompt, (void)); STATIC_PROTO (int PlGetc, (int)); STATIC_PROTO (int MemGetc, (int)); STATIC_PROTO (int ISOGetc, (int)); STATIC_PROTO (int ConsoleGetc, (int)); STATIC_PROTO (int PipeGetc, (int)); STATIC_PROTO (int ConsolePipeGetc, (int)); #if USE_SOCKET STATIC_PROTO (int SocketGetc, (int)); STATIC_PROTO (int ConsoleSocketGetc, (int)); #endif #if HAVE_LIBREADLINE STATIC_PROTO (int ReadlineGetc, (int)); STATIC_PROTO (int ReadlinePutc, (int,int)); #endif STATIC_PROTO (int PlUnGetc, (int)); STATIC_PROTO (Term MkStream, (int)); STATIC_PROTO (Int p_stream_flags, (void)); STATIC_PROTO (int find_csult_file, (char *, char *, StreamDesc *, char *)); STATIC_PROTO (Int p_open, (void)); STATIC_PROTO (int AddAlias, (Atom, int)); STATIC_PROTO (void SetAlias, (Atom, int)); STATIC_PROTO (void PurgeAlias, (int)); STATIC_PROTO (int CheckAlias, (Atom)); STATIC_PROTO (Atom FetchAlias, (int)); STATIC_PROTO (int FindAliasForStream, (int, Atom)); STATIC_PROTO (int CheckStream, (Term, int, char *)); STATIC_PROTO (Int p_check_stream, (void)); STATIC_PROTO (Int p_check_if_stream, (void)); STATIC_PROTO (Int init_cur_s, (void)); STATIC_PROTO (Int cont_cur_s, (void)); STATIC_PROTO (Int p_close, (void)); STATIC_PROTO (Int p_set_input, (void)); STATIC_PROTO (Int p_set_output, (void)); STATIC_PROTO (Int p_current_input, (void)); STATIC_PROTO (Int p_current_output, (void)); STATIC_PROTO (Int p_write, (void)); STATIC_PROTO (Int p_write2, (void)); STATIC_PROTO (Int p_set_read_error_handler, (void)); STATIC_PROTO (Int p_get_read_error_handler, (void)); STATIC_PROTO (Int p_read, (void)); STATIC_PROTO (Int p_cur_line_no, (void)); STATIC_PROTO (Int p_get, (void)); STATIC_PROTO (Int p_get0, (void)); STATIC_PROTO (Int p_get_byte, (void)); STATIC_PROTO (Int p_peek, (void)); STATIC_PROTO (Int p_past_eof, (void)); STATIC_PROTO (Int p_put, (void)); STATIC_PROTO (Int p_put_byte, (void)); STATIC_PROTO (Int p_skip, (void)); STATIC_PROTO (Int p_flush, (void)); STATIC_PROTO (Int p_flush_all_streams, (void)); STATIC_PROTO (Int p_write_depth, (void)); STATIC_PROTO (Int p_open_null_stream, (void)); STATIC_PROTO (Int p_user_file_name, (void)); STATIC_PROTO (Int p_line_position, (void)); STATIC_PROTO (Int p_character_count, (void)); STATIC_PROTO (Int p_show_stream_flags, (void)); STATIC_PROTO (Int p_show_stream_position, (void)); STATIC_PROTO (Int p_set_stream_position, (void)); STATIC_PROTO (Int p_add_alias_to_stream, (void)); STATIC_PROTO (Int p_change_alias_to_stream, (void)); STATIC_PROTO (Int p_check_if_valid_new_alias, (void)); STATIC_PROTO (Int p_fetch_stream_alias, (void)); STATIC_PROTO (Int p_format, (void)); STATIC_PROTO (Int p_startline, (void)); STATIC_PROTO (Int p_change_type_of_char, (void)); STATIC_PROTO (Int p_type_of_char, (void)); STATIC_PROTO (void CloseStream, (int)); static int GetFreeStreamD(void) { int sno; for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) { return -1; } return sno; } int Yap_GetFreeStreamD(void) { return GetFreeStreamD(); } static int yap_fflush(int sno) { #if HAVE_LIBREADLINE if (Stream[sno].status & Tty_Stream_f && Stream[sno].status & Output_Stream_f) { if (ReadlinePos != ReadlineBuf) { ReadlinePos[0] = '\0'; fputs( ReadlineBuf, Stream[sno].u.file.file); } ReadlinePos = ReadlineBuf; } #endif if ( (Stream[sno].status & Output_Stream_f) && ! (Stream[sno].status & (Null_Stream_f| InMemory_Stream_f| Socket_Stream_f| Pipe_Stream_f| Free_Stream_f)) ) { return(fflush(Stream[sno].u.file.file)); } else return(0); } static void unix_upd_stream_info (StreamDesc * s) { if (s->status & InMemory_Stream_f) { s->status |= Seekable_Stream_f; return; } #if USE_SOCKET if (Yap_sockets_io && s->u.file.file == NULL) { s->status |= Socket_Stream_f; s->u.socket.domain = af_inet; s->u.socket.flags = client_socket; s->u.socket.fd = 0; return; } #endif /* USE_SOCKET */ #if _MSC_VER || defined(__MINGW32__) { if ( #ifdef __MINGW32__ TRUE /* we cannot trust _isatty in MINGW */ #else _isatty(_fileno(s->u.file.file)) #endif ) { s->status |= Tty_Stream_f|Reset_Eof_Stream_f|Promptable_Stream_f; /* make all console descriptors unbuffered */ setvbuf(s->u.file.file, NULL, _IONBF, 0); } #if _MSC_VER /* standard error stream should never be buffered */ else if (StdErrStream == s-Stream) { setvbuf(s->u.file.file, NULL, _IONBF, 0); } #endif return; } #else #if HAVE_ISATTY #if __simplescalar__ /* isatty does not seem to work with simplescar. I'll assume the first three streams will probably be ttys (pipes are not thatg different) */ if (s-Stream < 3) { s->u.file.name = Yap_LookupAtom("tty"); s->status |= Tty_Stream_f|Reset_Eof_Stream_f|Promptable_Stream_f; } #else { int filedes; /* visualc */ filedes = YP_fileno (s->u.file.file); if (isatty (filedes)) { #if HAVE_TTYNAME char *ttys = ttyname(filedes); if (ttys == NULL) s->u.file.name = Yap_LookupAtom("tty"); else s->u.file.name = Yap_LookupAtom(ttys); #else s->u.file.name = Yap_LookupAtom("tty"); #endif s->status |= Tty_Stream_f|Reset_Eof_Stream_f|Promptable_Stream_f; return; } } #endif #endif /* HAVE_ISATTY */ #endif /* _MSC_VER */ s->status |= Seekable_Stream_f; } static Int p_always_prompt_user(void) { StreamDesc *s = Stream+StdInStream; s->status |= Promptable_Stream_f; #if USE_SOCKET if (s->status & Socket_Stream_f) { s->stream_getc = ConsoleSocketGetc; } else #endif #if HAVE_LIBREADLINE if (s->status & Tty_Stream_f) { s->stream_getc = ReadlineGetc; if (Stream[0].status & Tty_Stream_f && s->u.file.name == Stream[0].u.file.name) s->stream_putc = ReadlinePutc; } else #endif { /* else just PlGet plus checking for prompt */ s->stream_getc = ConsoleGetc; } return(TRUE); } static int is_same_tty(YP_File f1, YP_File f2) { #if HAVE_TTYNAME return(ttyname(YP_fileno(f1)) == ttyname(YP_fileno(f2))); #else return(TRUE); #endif } static void InitStdStream (int sno, SMALLUNSGN flags, YP_File file) { StreamDesc *s = &Stream[sno]; s->u.file.file = file; s->status = flags; s->linepos = 0; s->linecount = 1; s->charcount = 0; unix_upd_stream_info (s); /* Getting streams to prompt is a mess because we need for cooperation between readers and writers to the stream :-( */ #if USE_SOCKET if (s->status & Socket_Stream_f) { /* Console is a socket and socket will prompt */ s->stream_putc = ConsoleSocketPutc; s->stream_getc = ConsoleSocketGetc; } else #endif if (s->status & Pipe_Stream_f) { /* Console is a socket and socket will prompt */ s->stream_putc = ConsolePipePutc; s->stream_getc = ConsolePipeGetc; } else if (s->status & InMemory_Stream_f) { s->stream_putc = MemPutc; s->stream_getc = MemGetc; } else { /* check if our console is promptable: may be tty or pipe */ if (s->status & (Promptable_Stream_f)) { /* the putc routine only has to check it is putting out a newline */ s->stream_putc = ConsolePutc; /* if a tty have a special routine to call readline */ #if HAVE_LIBREADLINE if (s->status & Tty_Stream_f) { if (Stream[0].status & Tty_Stream_f && is_same_tty(s->u.file.file,Stream[0].u.file.file)) s->stream_putc = ReadlinePutc; s->stream_getc = ReadlineGetc; } else #endif { /* else just PlGet plus checking for prompt */ s->stream_getc = ConsoleGetc; } } else { /* we are reading from a file, no need to check for prompts */ s->stream_putc = FilePutc; s->stream_getc = PlGetc; } switch(sno) { case 0: s->u.file.name=Yap_LookupAtom("user_input"); break; case 1: s->u.file.name=Yap_LookupAtom("user_output"); break; default: s->u.file.name=Yap_LookupAtom("user_error"); break; } s->u.file.user_name = MkAtomTerm (s->u.file.name); } if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; #if LIGHT s->status |= Tty_Stream_f|Promptable_Stream_f; #endif #if HAVE_SETBUF if (s->status & Tty_Stream_f) /* make sure input is unbuffered if it comes from stdin, this makes life simpler for interrupt handling */ YP_setbuf (stdin, NULL); #endif /* HAVE_SETBUF */ } static void InitStdStreams (void) { if (Yap_sockets_io) { InitStdStream (StdInStream, Input_Stream_f, NULL); InitStdStream (StdOutStream, Output_Stream_f, NULL); InitStdStream (StdErrStream, Output_Stream_f, NULL); } else { InitStdStream (StdInStream, Input_Stream_f, stdin); InitStdStream (StdOutStream, Output_Stream_f, stdout); InitStdStream (StdErrStream, Output_Stream_f, stderr); } Yap_c_input_stream = StdInStream; Yap_c_output_stream = StdOutStream; Yap_c_error_stream = StdErrStream; /* init standard aliases */ FileAliases[0].name = AtomUsrIn; FileAliases[0].alias_stream = 0; FileAliases[1].name = AtomUsrOut; FileAliases[1].alias_stream = 1; FileAliases[2].name = AtomUsrErr; FileAliases[2].alias_stream = 2; NOfFileAliases = 3; SzOfFileAliases = ALIASES_BLOCK_SIZE; } void Yap_InitStdStreams (void) { InitStdStreams(); } static void InitPlIO (void) { Int i; for (i = 0; i < MaxStreams; ++i) Stream[i].status = Free_Stream_f; /* alloca alias array */ FileAliases = (AliasDesc)Yap_AllocCodeSpace(sizeof(struct AliasDescS)*ALIASES_BLOCK_SIZE); InitStdStreams(); } void Yap_InitPlIO (void) { InitPlIO (); } static Int PlIOError (yap_error_number type, Term culprit, char *who) { if (Yap_GetValue(Yap_LookupAtom("fileerrors")) == MkIntTerm(1)) { Yap_Error(type, culprit, who); /* and fail */ return(FALSE); } else { return(FALSE); } } /* * Used by the prompts to check if they are after a newline, and then a * prompt should be output, or if we are in the middle of a line. */ static int newline = TRUE; static void count_output_char(int ch, StreamDesc *s) { if (ch == '\n') { #if MPWSHELL if (mpwshell && (sno == StdOutStream || sno == StdErrStream) && !(s->status & Null_Stream_f)) { putc (MPWSEP, s->u.file.file); if (!(Stream[Yap_c_output_stream].status & Null_Stream_f)) fflush (stdout); } #endif /* Inform that we have written a newline */ ++s->charcount; ++s->linecount; s->linepos = 0; } else { #if MAC if ((sno == StdOutStream || sno == StdErrStream) && s->linepos > 200) sno->stream_putc(sno, '\n'); #endif ++s->charcount; ++s->linepos; } } static void console_count_output_char(int ch, StreamDesc *s) { if (ch == '\n') { #if MPWSHELL if (mpwshell && (sno == StdOutStream || sno == StdErrStream) && !(s->status & Null_Stream_f)) { putc (MPWSEP, s->u.file.file); if (!(Stream[Yap_c_output_stream].status & Null_Stream_f)) fflush (stdout); } #endif ++s->charcount; ++s->linecount; s->linepos = 0; newline = TRUE; /* Inform we are not at the start of a newline */ } else { newline = FALSE; #if MAC if ((sno == StdOutStream || sno == StdErrStream) && s->linepos > 200) sno->stream_putc(sno, '\n'); #endif ++s->charcount; ++s->linepos; } } #ifdef DEBUG static int eolflg = 1; static char my_line[200] = {0}; static char *lp = my_line; static YP_File curfile; #ifdef MACC static void InTTYLine(char *line) { char *p = line; char ch; while ((ch = InKey()) != '\n' && ch != '\r') if (ch == 8) { if (line < p) BackupTTY(*--p); } else TTYChar(*p++ = ch); TTYChar('\n'); *p = 0; } #endif void Yap_DebugSetIFile(char *fname) { if (curfile) YP_fclose(curfile); curfile = YP_fopen(fname, "r"); if (curfile == NULL) { curfile = stdin; fprintf(stderr,"%% YAP Warning: can not open %s for input\n", fname); } } void Yap_DebugEndline() { *lp = 0; } int Yap_DebugGetc() { int ch; if (eolflg) { if (curfile != NULL) { if (YP_fgets(my_line, 200, curfile) == 0) curfile = NULL; } if (curfile == NULL) YP_fgets(my_line, 200, stdin); eolflg = 0; lp = my_line; } if ((ch = *lp++) == 0) ch = '\n', eolflg = 1; if (Yap_Option['l' - 96]) putc(ch, Yap_logfile); return (ch); } int Yap_DebugPutc(int sno, int ch) { if (Yap_Option['l' - 96]) (void) putc(ch, Yap_logfile); return (putc(ch, Yap_stderr)); } #endif /* static */ static int FilePutc(int sno, int ch) { StreamDesc *s = &Stream[sno]; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif putc(ch, s->u.file.file); #if MAC || _MSC_VER if (ch == 10) { fflush(s->u.file.file); } #endif count_output_char(ch,s); return ((int) ch); } /* static */ static int MemPutc(int sno, int ch) { StreamDesc *s = &Stream[sno]; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif s->u.mem_string.buf[s->u.mem_string.pos++] = ch; if (s->u.mem_string.pos == s->u.mem_string.max_size) { extern int Yap_page_size; /* oops, we have reached an overflow */ Int new_max_size = s->u.mem_string.max_size + Yap_page_size; char *newbuf; if ((newbuf = Yap_AllocAtomSpace(new_max_size*sizeof(char))) == NULL) { if (Stream[sno].u.mem_string.error_handler) { Yap_Error_Size = new_max_size*sizeof(char); longjmp(*(jmp_buf *)Stream[sno].u.mem_string.error_handler,1); } else { Yap_Error(OUT_OF_HEAP_ERROR, TermNil, "YAP could not grow heap for writing to string"); } return -1; } #if HAVE_MEMMOVE memmove((void *)newbuf, (void *)s->u.mem_string.buf, (size_t)((s->u.mem_string.pos)*sizeof(char))); #else { Int n = s->u.mem_string.pos; char *to = newbuf; char *from = s->u.mem_string.buf; while (n-- >= 0) { *to++ = *from++; } } #endif Yap_FreeAtomSpace(s->u.mem_string.buf); s->u.mem_string.buf = newbuf; s->u.mem_string.max_size = new_max_size; } count_output_char(ch,s); return ((int) ch); } #if USE_SOCKET /* static */ static int ConsoleSocketPutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; char c = ch; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif #if _MSC_VER || defined(__MINGW32__) send(s->u.socket.fd, &c, sizeof(c), 0); #else if (write(s->u.socket.fd, &c, sizeof(c)) < 0) { #if HAVE_STRERROR Yap_Error(FATAL_ERROR, TermNil, "no access to console: %s", strerror(errno)); #else Yap_Error(FATAL_ERROR, TermNil, "no access to console"); #endif } #endif count_output_char(ch,s); return ((int) ch); } static int SocketPutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; char c = ch; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif #if _MSC_VER || defined(__MINGW32__) send(s->u.socket.fd, &c, sizeof(c), 0); #else write(s->u.socket.fd, &c, sizeof(c)); #endif console_count_output_char(ch,s); return ((int) ch); } #endif /* static */ static int ConsolePipePutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; char c = ch; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif #if _MSC_VER || defined(__MINGW32__) { DWORD written; if (WriteFile(s->u.pipe.hdl, &c, sizeof(c), &written, NULL) == FALSE) { PlIOError (SYSTEM_ERROR,TermNil, "write to pipe returned error"); return(EOF); } } #else write(s->u.pipe.fd, &c, sizeof(c)); #endif count_output_char(ch,s); return ((int) ch); } static int PipePutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; char c = ch; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif #if _MSC_VER || defined(__MINGW32__) { DWORD written; if (WriteFile(s->u.pipe.hdl, &c, sizeof(c), &written, NULL) == FALSE) { PlIOError (SYSTEM_ERROR,TermNil, "write to pipe returned error"); return(EOF); } } #else write(s->u.pipe.fd, &c, sizeof(c)); #endif console_count_output_char(ch,s); return ((int) ch); } static int NullPutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif count_output_char(ch,s); return ((int) ch); } /* static */ static int ConsolePutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; #if MAC || _MSC_VER || defined(__MINGW32__) if (ch == 10) { putc ('\n', s->u.file.file); } else #endif putc (ch, s->u.file.file); console_count_output_char(ch,s); return ((int) ch); } static Int p_setprompt (void) { /* 'prompt(Atom) */ Term t = Deref(ARG1); if (IsVarTerm (t) || !IsAtomTerm (t)) return (FALSE); *AtPrompt = AtomOfTerm (t); return (TRUE); } static Int p_is_same_tty (void) { /* 'prompt(Atom) */ int sni = CheckStream (ARG1, Input_Stream_f, "put/2"); int sno = CheckStream (ARG2, Output_Stream_f, "put/2"); return ( (Stream[sni].status & Tty_Stream_f) && (Stream[sno].status & Tty_Stream_f) && is_same_tty(Stream[sno].u.file.file,Stream[sni].u.file.file) ); } static Int p_prompt (void) { /* prompt(Old,New) */ Term t = Deref (ARG2); Atom a; if (!Yap_unify_constant (ARG1, MkAtomTerm (*AtPrompt))) return (FALSE); if (IsVarTerm (t) || !IsAtomTerm (t)) return (FALSE); a = AtomOfTerm (t); if (strlen (RepAtom (a)->StrOfAE) > MAX_PROMPT) { Yap_Error(SYSTEM_ERROR,t,"prompt %s is too long", RepAtom (a)->StrOfAE); return(FALSE); } strncpy(Prompt, RepAtom (a)->StrOfAE, MAX_PROMPT); *AtPrompt = a; return (TRUE); } #if HAVE_LIBREADLINE #if HAVE_READLINE_READLINE_H #include #endif extern void add_history (const char *); static char *ttyptr = NULL; static char *myrl_line = (char *) NULL; static int cur_out_sno = 2; #define READLINE_OUT_BUF_MAX 256 static void InitReadline(void) { ReadlineBuf = (char *)Yap_AllocAtomSpace(READLINE_OUT_BUF_MAX+1); ReadlinePos = ReadlineBuf; #if _MSC_VER || defined(__MINGW32__) rl_instream = stdin; rl_outstream = stdout; #endif } static int ReadlinePutc (int sno, int ch) { if (ReadlinePos != ReadlineBuf && (ReadlinePos - ReadlineBuf == READLINE_OUT_BUF_MAX-1 /* overflow */ || #if MAC || _MSC_VER ch == 10 || #endif ch == '\n')) { #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif if (ch == '\n') { ReadlinePos[0] = '\n'; ReadlinePos++; } ReadlinePos[0] = '\0'; fputs( ReadlineBuf, Stream[sno].u.file.file); ReadlinePos = ReadlineBuf; if (ch == '\n') { console_count_output_char(ch,Stream+sno); return((int) '\n'); } } *ReadlinePos++ = ch; console_count_output_char(ch,Stream+sno); return ((int) ch); } /* reading from the console is complicated because we need to know whether to prompt and so on... */ static int ReadlineGetc(int sno) { register StreamDesc *s = &Stream[sno]; register int ch; while (ttyptr == NULL) { /* Only sends a newline if we are at the start of a line */ if (myrl_line != NULL && myrl_line != (char *) EOF) free (myrl_line); rl_instream = Stream[sno].u.file.file; rl_outstream = Stream[cur_out_sno].u.file.file; /* window of vulnerability opened */ if (newline) { char *cptr = Prompt, ch; if ((Stream[FileAliases[2].alias_stream].status & Tty_Stream_f) && Stream[FileAliases[0].alias_stream].u.file.name == Stream[sno].u.file.name) { /* don't just output the prompt */ while ((ch = *cptr++) != '\0') { console_count_output_char(ch,Stream+StdErrStream); } Yap_PrologMode |= ConsoleGetcMode; myrl_line = readline (Prompt); } else { Yap_PrologMode |= ConsoleGetcMode; myrl_line = readline (NULL); } } else { if (ReadlinePos != ReadlineBuf) { ReadlinePos[0] = '\0'; ReadlinePos = ReadlineBuf; Yap_PrologMode |= ConsoleGetcMode; myrl_line = readline (ReadlineBuf); } else { Yap_PrologMode |= ConsoleGetcMode; myrl_line = readline (NULL); } } /* Do it the gnu way */ if (Yap_PrologMode & InterruptMode) { Yap_PrologMode &= ~InterruptMode; Yap_ProcessSIGINT(); Yap_PrologMode &= ~ConsoleGetcMode; if (Yap_PrologMode & AbortMode) { Yap_Error(PURE_ABORT, TermNil, ""); Yap_ErrorMessage = "Abort"; return(console_post_process_read_char(EOF, s)); } continue; } else { Yap_PrologMode &= ~ConsoleGetcMode; } newline=FALSE; strncpy (Prompt, RepAtom (*AtPrompt)->StrOfAE, MAX_PROMPT); /* window of vulnerability closed */ if (myrl_line == NULL || myrl_line == (char *) EOF) return(console_post_process_read_char(EOF, s)); if (myrl_line[0] != '\0' && myrl_line[1] != '\0') add_history (myrl_line); ttyptr = myrl_line; } if (*ttyptr == '\0') { ttyptr = NIL; ch = '\n'; } else { ch = *ttyptr++; } return(console_post_process_read_char(ch, s)); } #endif /* HAVE_LIBREADLINE */ int Yap_GetCharForSIGINT(void) { int ch; #if HAVE_LIBREADLINE if ((Yap_PrologMode & ConsoleGetcMode) && myrl_line != (char *) NULL) { ch = myrl_line[0]; free(myrl_line); myrl_line = NULL; } else { myrl_line = readline ("Action (h for help): "); if (myrl_line == (char *)NULL || myrl_line == (char *)EOF) { ch = EOF; } else { ch = myrl_line[0]; free(myrl_line); myrl_line = NULL; } } #else /* ask for a new line */ fprintf(stderr, "Action (h for help): "); ch = getc(stdin); /* first process up to end of line */ while ((fgetc(stdin)) != '\n'); #endif newline = TRUE; return ch; } /* handle reading from a stream after having found an EOF */ static int EOFGetc(int sno) { register StreamDesc *s = &Stream[sno]; if (s->status & Push_Eof_Stream_f) { /* ok, we have pushed an EOF, send it away */ s->status &= ~Push_Eof_Stream_f; return(EOF); } if (s->status & Eof_Error_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM,MkAtomTerm(s->u.file.name), "GetC"); } else if (s->status & Reset_Eof_Stream_f) { /* reset the eof indicator on file */ if (YP_feof (s->u.file.file)) YP_clearerr (s->u.file.file); /* reset our function for reading input */ #if USE_SOCKET if (s->status & Socket_Stream_f) { if (s->status & Promptable_Stream_f) s->stream_putc = ConsoleSocketPutc; else s->stream_putc = SocketPutc; } else #endif if (s->status & Pipe_Stream_f) { if (s->status & Promptable_Stream_f) s->stream_putc = ConsolePipePutc; else s->stream_putc = PipePutc; } else if (s->status & InMemory_Stream_f) { s->stream_getc = MemGetc; s->stream_putc = MemPutc; } else if (s->status & Promptable_Stream_f) { s->stream_putc = ConsolePutc; #if HAVE_LIBREADLINE if (s->status & Tty_Stream_f) { s->stream_getc = ReadlineGetc; if (Stream[0].status & Tty_Stream_f && is_same_tty(s->u.file.file,Stream[0].u.file.file)) s->stream_putc = ReadlinePutc; } else #endif { s->stream_getc = ConsoleGetc; } } else { s->stream_getc = PlGetc; } if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; if (CharConversionTable != NULL) s->stream_getc = ISOGetc; /* next, reset our own error indicator */ s->status &= ~Eof_Stream_f; /* try reading again */ return(s->stream_getc(sno)); } else { s->status |= Past_Eof_Stream_f; } return (EOF); } /* check if we read a newline or an EOF */ static int post_process_read_char(int ch, StreamDesc *s) { if (ch == '\n') { ++s->linecount; ++s->charcount; s->linepos = 0; /* don't convert if the stream is binary */ if (!(s->status & Binary_Stream_f)) ch = 10; } else if (ch == EOF) { s->status |= Eof_Stream_f; s->stream_getc = EOFGetc; if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; return (EOFCHAR); } else { ++s->charcount; ++s->linepos; } return(ch); } /* check if we read a newline or an EOF */ static int console_post_process_read_char(int ch, StreamDesc *s) { if (ch == '\n') { ++s->linecount; ++s->charcount; s->linepos = 0; newline = TRUE; } else if (ch == EOF) { s->status |= Eof_Stream_f; s->stream_getc = EOFGetc; if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; newline = FALSE; return (EOFCHAR); } else { ++s->charcount; ++s->linepos; newline = FALSE; } return(ch); } #if USE_SOCKET /* sockets cannot use standard FILE *, we have to go through fds, and in the case of VC++, we have to use the receive routines... */ static int SocketGetc(int sno) { register StreamDesc *s = &Stream[sno]; register int ch; char c; int count; /* should be able to use a buffer */ #if _MSC_VER || defined(__MINGW32__) count = recv(s->u.socket.fd, &c, sizeof(char), 0); #else count = read(s->u.socket.fd, &c, sizeof(char)); #endif if (count == 0) { s->u.socket.flags = closed_socket; ch = EOF; } else if (count > 0) { ch = c; } else { #if HAVE_STRERROR Yap_Error(SYSTEM_ERROR, TermNil, "( socket_getc: %s)", strerror(errno)); #else Yap_Error(SYSTEM_ERROR, TermNil, "(socket_getc)"); #endif return(EOF); } return(post_process_read_char(ch, s)); } /* Basically, the same as console but also sends a prompt and takes care of finding out whether we are at the start of a newline. */ static int ConsoleSocketGetc(int sno) { register StreamDesc *s = &Stream[sno]; register int ch; char c; int count; /* send the prompt away */ if (newline) { char *cptr = Prompt, ch; /* use the default routine */ while ((ch = *cptr++) != '\0') { Stream[StdErrStream].stream_putc(StdErrStream, ch); } strncpy(Prompt, RepAtom (*AtPrompt)->StrOfAE, MAX_PROMPT); newline = FALSE; } /* should be able to use a buffer */ Yap_PrologMode |= ConsoleGetcMode; #if _MSC_VER || defined(__MINGW32__) count = recv(s->u.socket.fd, &c, sizeof(char), 0); #else count = read(s->u.socket.fd, &c, sizeof(char)); #endif Yap_PrologMode &= ~ConsoleGetcMode; if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Yap_Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(console_post_process_read_char(ch, s)); } #endif static int PipeGetc(int sno) { register StreamDesc *s = &Stream[sno]; register int ch; char c; /* should be able to use a buffer */ #if _MSC_VER || defined(__MINGW32__) DWORD count; if (WriteFile(s->u.pipe.hdl, &c, sizeof(c), &count, NULL) == FALSE) { PlIOError (SYSTEM_ERROR,TermNil, "write to pipe returned error"); return(EOF); } #else int count; count = read(s->u.pipe.fd, &c, sizeof(char)); #endif if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Yap_Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(post_process_read_char(ch, s)); } /* Basically, the same as console but also sends a prompt and takes care of finding out whether we are at the start of a newline. */ static int ConsolePipeGetc(int sno) { register StreamDesc *s = &Stream[sno]; register int ch; char c; #if _MSC_VER || defined(__MINGW32__) DWORD count; #else int count; #endif /* send the prompt away */ if (newline) { char *cptr = Prompt, ch; /* use the default routine */ while ((ch = *cptr++) != '\0') { Stream[StdErrStream].stream_putc(StdErrStream, ch); } strncpy(Prompt, RepAtom (*AtPrompt)->StrOfAE, MAX_PROMPT); newline = FALSE; } #if _MSC_VER || defined(__MINGW32__) if (WriteFile(s->u.pipe.hdl, &c, sizeof(c), &count, NULL) == FALSE) { Yap_PrologMode |= ConsoleGetcMode; PlIOError (SYSTEM_ERROR,TermNil, "read from pipe returned error"); Yap_PrologMode &= ~ConsoleGetcMode; return(EOF); } #else /* should be able to use a buffer */ Yap_PrologMode |= ConsoleGetcMode; count = read(s->u.pipe.fd, &c, sizeof(char)); Yap_PrologMode &= ~ConsoleGetcMode; #endif if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Yap_Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(console_post_process_read_char(ch, s)); } /* standard routine, it should read from anything pointed by a FILE *. It could be made more efficient by doing our own buffering and avoiding post_process_read_char, something to think about */ static int PlGetc (int sno) { register StreamDesc *s = &Stream[sno]; register int ch; ch = YP_getc (s->u.file.file); return(post_process_read_char(ch, s)); } /* read from memory */ static int MemGetc (int sno) { register StreamDesc *s = &Stream[sno]; Int ch, spos; spos = s->u.mem_string.pos; if (spos == s->u.mem_string.max_size) ch = -1; else { ch = s->u.mem_string.buf[spos]; s->u.mem_string.pos = ++spos; } return(post_process_read_char(ch, s)); } /* I dispise this code!!!!! */ static int ISOGetc (int sno) { int ch = Stream[sno].stream_getc(sno); if (ch != EOF && CharConversionTable != NULL) { int nch; nch = CharConversionTable[ch]; if (nch != '\0') { ch = nch; } } return(ch); } /* send a prompt, and use the system for internal buffering. Speed is not of the essence here !!! */ static int ConsoleGetc(int sno) { register StreamDesc *s = &Stream[sno]; char ch; restart: if (newline) { char *cptr = Prompt, ch; /* use the default routine */ while ((ch = *cptr++) != '\0') { Stream[StdErrStream].stream_putc(StdErrStream, ch); } strncpy (Prompt, RepAtom (*AtPrompt)->StrOfAE, MAX_PROMPT); newline = FALSE; } #if HAVE_SIGINTERRUPT siginterrupt(SIGINT, TRUE); #endif Yap_PrologMode |= ConsoleGetcMode; ch = YP_fgetc(s->u.file.file); #if HAVE_SIGINTERRUPT siginterrupt(SIGINT, FALSE); #endif if (Yap_PrologMode & InterruptMode) { Yap_PrologMode &= ~InterruptMode; Yap_ProcessSIGINT(); Yap_PrologMode &= ~ConsoleGetcMode; newline = TRUE; if (Yap_PrologMode & AbortMode) { Yap_Error(PURE_ABORT, TermNil, ""); Yap_ErrorMessage = "Abort"; return(console_post_process_read_char(EOF, s)); } goto restart; } else { Yap_PrologMode &= ~ConsoleGetcMode; } return(console_post_process_read_char(ch, s)); } /* reads a character from a buffer and does the rest */ static int PlUnGetc (int sno) { register StreamDesc *s = &Stream[sno]; Int ch; if (s->stream_getc != PlUnGetc) return(s->stream_getc(sno)); ch = s->och; if (s->status & InMemory_Stream_f) { s->stream_getc = MemGetc; s->stream_putc = MemPutc; } else if (s->status & Promptable_Stream_f) { s->stream_putc = ConsolePutc; #if HAVE_LIBREADLINE if (s->status & Tty_Stream_f) { s->stream_getc = ReadlineGetc; if (Stream[0].status & Tty_Stream_f && is_same_tty(s->u.file.file,Stream[0].u.file.file)) s->stream_putc = ReadlinePutc; } else #endif { s->stream_getc = ConsoleGetc; } } else { s->stream_getc = PlGetc; } return(post_process_read_char(ch, s)); } /* used by user-code to read characters from the current input stream */ int Yap_PlGetchar (void) { return(Stream[Yap_c_input_stream].stream_getc(Yap_c_input_stream)); } /* avoid using a variable to call a function */ int Yap_PlFGetchar (void) { return(PlGetc(Yap_c_input_stream)); } static Term MkStream (int n) { Term t[1]; t[0] = MkIntTerm (n); return (Yap_MkApplTerm (FunctorStream, 1, t)); } static Int p_stream_flags (void) { /* '$stream_flags'(+N,-Flags) */ Term trm; trm = Deref (ARG1); if (IsVarTerm (trm) || !IsIntTerm (trm)) return (FALSE); return (Yap_unify_constant (ARG2, MkIntTerm (Stream[IntOfTerm (trm)].status))); } static int find_csult_file (char *source, char *buf, StreamDesc * st, char *io_mode) { char *cp = source, ch; while (*cp++); while ((ch = *--cp) != '.' && !Yap_dir_separator((int)ch) && cp != source); if (ch == '.') return (FALSE); strncpy (buf, source, YAP_FILENAME_MAX); strncat (buf, ".yap", YAP_FILENAME_MAX); if ((st->u.file.file = YP_fopen (buf, io_mode)) != YAP_ERROR) return (TRUE); strncpy (buf, source, YAP_FILENAME_MAX); strncat (buf, ".pl", YAP_FILENAME_MAX); if ((st->u.file.file = YP_fopen (buf, io_mode)) != YAP_ERROR) return (TRUE); return (FALSE); } /* given a stream index, get the corresponding fd */ static int GetStreamFd(int sno) { #if USE_SOCKET if (Stream[sno].status & Socket_Stream_f) { return(Stream[sno].u.socket.fd); } else #endif if (Stream[sno].status & Pipe_Stream_f) { #if _MSC_VER || defined(__MINGW32__) return((int)(Stream[sno].u.pipe.hdl)); #else return(Stream[sno].u.pipe.fd); #endif } else if (Stream[sno].status & InMemory_Stream_f) { return(-1); } return(YP_fileno(Stream[sno].u.file.file)); } int Yap_GetStreamFd(int sno) { return GetStreamFd(sno); } /* given a socket file descriptor, get the corresponding stream descripor */ int Yap_CheckIOStream(Term stream, char * error) { return(CheckStream(stream, Input_Stream_f|Output_Stream_f|Socket_Stream_f, error)); } #if USE_SOCKET Term Yap_InitSocketStream(int fd, socket_info flags, socket_domain domain) { StreamDesc *st; int sno; sno = GetFreeStreamD(); if (sno < 0) { PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for socket/4"); return(TermNil); } st = &Stream[sno]; st->u.socket.domain = domain; st->u.socket.flags = flags; if (flags & (client_socket|server_session_socket)) { /* I can read and write from these sockets */ st->status = (Socket_Stream_f|Input_Stream_f|Output_Stream_f); } else { /* oops, I cannot */ st->status = Socket_Stream_f; } st->u.socket.fd = fd; st->charcount = 0; st->linecount = 1; st->linepos = 0; st->stream_putc = SocketPutc; st->stream_getc = SocketGetc; if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = st->stream_getc; return(MkStream(sno)); } /* given a socket file descriptor, get the corresponding stream descripor */ int Yap_CheckSocketStream(Term stream, char * error) { return(CheckStream(stream, Socket_Stream_f, error)); } /* given a stream index, get the corresponding domain */ socket_domain Yap_GetSocketDomain(int sno) { return(Stream[sno].u.socket.domain); } /* given a stream index, get the corresponding status */ socket_info Yap_GetSocketStatus(int sno) { return(Stream[sno].u.socket.flags); } /* update info on a socket, eg, new->server or new->client */ void Yap_UpdateSocketStream(int sno, socket_info flags, socket_domain domain) { StreamDesc *st; st = &Stream[sno]; st->u.socket.domain = domain; st->u.socket.flags = flags; if (flags & (client_socket|server_session_socket)) { /* I can read and write from these sockets */ st->status = (Socket_Stream_f|Input_Stream_f|Output_Stream_f); } else { /* oops, I cannot */ st->status = Socket_Stream_f; } } #endif /* USE_SOCKET */ static int binary_file(char *file_name) { #if HAVE_STAT #if _MSC_VER || defined(__MINGW32__) struct _stat ss; if (_stat(file_name, &ss) != 0) { #else struct stat ss; if (stat(file_name, &ss) != 0) { #endif /* ignore errors while checking a file */ return(FALSE); } return (S_ISDIR(ss.st_mode)); #else return(FALSE); #endif } static Int p_open (void) { /* '$open'(+File,+Mode,?Stream,-ReturnCode) */ Term file_name, t, t2, topts; Atom open_mode; int sno; SMALLUNSGN s; char io_mode[8]; StreamDesc *st; Int opts; file_name = Deref(ARG1); /* we know file_name is bound */ if (!IsAtomTerm (file_name)) { Yap_Error(DOMAIN_ERROR_SOURCE_SINK,file_name, "open/3"); return(FALSE); } t2 = Deref (ARG2); if (!IsAtomTerm (t2)) { Yap_Error(TYPE_ERROR_ATOM,t2, "open/3"); return(FALSE); } open_mode = AtomOfTerm (t2); if (open_mode == AtomRead || open_mode == AtomCsult) { if (open_mode == AtomCsult && AtomOfTerm(file_name) == AtomUsrIn) { return(Yap_unify(MkStream(FileAliases[0].alias_stream), ARG3)); } strncpy(io_mode,"rb", 8); s = Input_Stream_f; } else if (open_mode == AtomWrite) { strncpy(io_mode,"w",8); s = Output_Stream_f; } else if (open_mode == AtomAppend) { strncpy(io_mode,"a",8); s = Append_Stream_f | Output_Stream_f; } else { Yap_Error(DOMAIN_ERROR_IO_MODE, t2, "open/3"); return(FALSE); } if (!Yap_TrueFileName (RepAtom (AtomOfTerm (file_name))->StrOfAE, Yap_FileNameBuf, FALSE)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK,file_name,"open/3")); sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open/3")); st = &Stream[sno]; /* can never happen */ topts = Deref(ARG4); if (IsVarTerm(topts) || !IsIntTerm(topts)) return(FALSE); opts = IntOfTerm(topts); #ifdef _WIN32 if (st->status & Binary_Stream_f) { strncat(io_mode, "b", 8); } else { strncat(io_mode, "t", 8); } #endif if ((st->u.file.file = YP_fopen (Yap_FileNameBuf, io_mode)) == YAP_ERROR || (!(opts & 2 /* binary */) && binary_file(Yap_FileNameBuf))) { if (open_mode == AtomCsult) { if (!find_csult_file (Yap_FileNameBuf, Yap_FileNameBuf2, st, io_mode)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK, file_name, "open/3")); strncpy (Yap_FileNameBuf, Yap_FileNameBuf2, YAP_FILENAME_MAX); } else { if (errno == ENOENT) return (PlIOError(EXISTENCE_ERROR_SOURCE_SINK,file_name,"open/3")); else return (PlIOError(PERMISSION_ERROR_OPEN_SOURCE_SINK,file_name,"open/3")); } } #if MAC if (open_mode == AtomWrite) { Yap_SetTextFile (RepAtom (AtomOfTerm (file_name))->StrOfAE); } #endif st->status = s; st->charcount = 0; st->linecount = 1; st->u.file.name = Yap_LookupAtom (Yap_FileNameBuf); st->u.file.user_name = file_name; st->linepos = 0; st->stream_putc = FilePutc; st->stream_getc = PlGetc; unix_upd_stream_info (st); if (opts != 0) { if (opts & 2) st->status |= Binary_Stream_f; if (opts & 4) { if (st->status & (Tty_Stream_f|Socket_Stream_f|InMemory_Stream_f)) { Term ta[1], t; #if USE_SOCKET if (st->status & Socket_Stream_f) { st->stream_putc = SocketPutc; st->stream_getc = SocketGetc; } else #endif if (st->status & Pipe_Stream_f) { st->stream_putc = PipePutc; st->stream_getc = PipeGetc; } else if (st->status & InMemory_Stream_f) { st->stream_putc = MemPutc; st->stream_getc = MemGetc; } else { st->stream_putc = ConsolePutc; st->stream_getc = PlGetc; } ta[1] = MkAtomTerm(AtomTrue); t = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("reposition"),1),1,ta); Yap_Error(PERMISSION_ERROR_OPEN_SOURCE_SINK,t,"open/4"); return(FALSE); } /* useless crap */ st->status |= Seekable_Stream_f; } if (opts & 8) { /* There may be one reason why one wouldn't want to seek in a file, maybe .... */ st->status &= ~Seekable_Stream_f; } if (opts & 16) { st->status &= ~(Reset_Eof_Stream_f); st->status |= Eof_Error_Stream_f; } if (opts & 32) { st->status &= ~(Eof_Error_Stream_f|Reset_Eof_Stream_f); } if (opts & 64) { st->status &= ~(Eof_Error_Stream_f); st->status |= Reset_Eof_Stream_f; } } if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = st->stream_getc; t = MkStream (sno); return (Yap_unify (ARG3, t)); } static Int p_file_expansion (void) { /* '$file_expansion'(+File,-Name) */ Term file_name = Deref(ARG1); /* we know file_name is bound */ if (!IsAtomTerm (file_name)) { PlIOError(TYPE_ERROR_ATOM, file_name, "absolute_file_name/3"); return(FALSE); } if (!Yap_TrueFileName (RepAtom (AtomOfTerm (file_name))->StrOfAE, Yap_FileNameBuf, FALSE)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK,file_name,"absolute_file_name/3")); return(Yap_unify(ARG2,MkAtomTerm(Yap_LookupAtom(Yap_FileNameBuf)))); } static Int p_add_alias_to_stream (void) { Term tname = Deref(ARG1); Term tstream = Deref(ARG2); Atom at; Int sno; if (IsVarTerm(tname)) { Yap_Error(INSTANTIATION_ERROR, tname, "$add_alias_to_stream"); return (FALSE); } else if (!IsAtomTerm (tname)) { Yap_Error(TYPE_ERROR_ATOM, tname, "$add_alias_to_stream"); return (FALSE); } if (IsVarTerm(tstream)) { Yap_Error(INSTANTIATION_ERROR, tstream, "$add_alias_to_stream"); return (FALSE); } else if (!IsApplTerm (tstream) || FunctorOfTerm (tstream) != FunctorStream || !IsIntTerm(ArgOfTerm(1,tstream))) { Yap_Error(DOMAIN_ERROR_STREAM_OR_ALIAS, tstream, "$add_alias_to_stream"); return (FALSE); } at = AtomOfTerm(tname); sno = (int)IntOfTerm(ArgOfTerm(1,tstream)); if (AddAlias(at, sno)) return(TRUE); /* we could not create the alias, time to close the stream */ CloseStream(sno); Yap_Error(PERMISSION_ERROR_NEW_ALIAS_FOR_STREAM, tname, "open/3"); return (FALSE); } static Int p_change_alias_to_stream (void) { Term tname = Deref(ARG1); Term tstream = Deref(ARG2); Atom at; Int sno; if (IsVarTerm(tname)) { Yap_Error(INSTANTIATION_ERROR, tname, "$change_alias_to_stream/2"); return (FALSE); } else if (!IsAtomTerm (tname)) { Yap_Error(TYPE_ERROR_ATOM, tname, "$change_alias_to_stream/2"); return (FALSE); } at = AtomOfTerm(tname); if ((sno = CheckStream (tstream, Input_Stream_f | Output_Stream_f | Append_Stream_f | Socket_Stream_f, "change_stream_alias/2")) == -1) return(FALSE); SetAlias(at, sno); return(TRUE); } static Int p_check_if_valid_new_alias (void) { Term tname = Deref(ARG1); Atom at; if (IsVarTerm(tname)) { Yap_Error(INSTANTIATION_ERROR, tname, "$add_alias_to_stream"); return (FALSE); } else if (!IsAtomTerm (tname)) { Yap_Error(TYPE_ERROR_ATOM, tname, "$add_alias_to_stream"); return (FALSE); } at = AtomOfTerm(tname); return(CheckAlias(at) == -1); } static Int p_fetch_stream_alias (void) { /* '$fetch_stream_alias'(Stream) */ int sno; Term t2 = Deref(ARG2); if ((sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f, "fetch_stream_alias/2")) == -1) return(FALSE); if (IsVarTerm(t2)) { Atom at = FetchAlias(sno); if (at == AtomFoundVar) return(FALSE); else return(Yap_unify_constant(t2, MkAtomTerm(at))); } else if (IsAtomTerm(t2)) { Atom at = AtomOfTerm(t2); return((Int)FindAliasForStream(sno,at)); } else { Yap_Error(TYPE_ERROR_ATOM, t2, "fetch_stream_alias/2"); return(FALSE); } } static Int p_open_null_stream (void) { Term t; StreamDesc *st; int sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_null_stream/1")); st = &Stream[sno]; st->status = Append_Stream_f | Output_Stream_f | Null_Stream_f; st->linepos = 0; st->charcount = 0; st->linecount = 1; st->stream_putc = NullPutc; st->stream_getc = PlGetc; st->stream_getc_for_read = PlGetc; st->u.file.user_name = MkAtomTerm (st->u.file.name = Yap_LookupAtom ("/dev/null")); t = MkStream (sno); return (Yap_unify (ARG1, t)); } Term Yap_OpenStream(FILE *fd, char *name, Term file_name, int flags) { Term t; StreamDesc *st; int sno; sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_null_stream/1")); st = &Stream[sno]; st->status = 0; if (flags & YAP_INPUT_STREAM) st->status |= Input_Stream_f; if (flags & YAP_OUTPUT_STREAM) st->status |= Output_Stream_f; if (flags & YAP_APPEND_STREAM) st->status |= Append_Stream_f; /* pipes assume an integer file descriptor, not a FILE *: if (flags & YAP_PIPE_STREAM) st->status |= Pipe_Stream_f; */ if (flags & YAP_TTY_STREAM) st->status |= Tty_Stream_f; if (flags & YAP_POPEN_STREAM) st->status |= Popen_Stream_f; if (flags & YAP_BINARY_STREAM) st->status |= Binary_Stream_f; if (flags & YAP_SEEKABLE_STREAM) st->status |= Seekable_Stream_f; st->charcount = 0; st->linecount = 1; st->u.file.name = Yap_LookupAtom(name); st->u.file.user_name = file_name; st->u.file.file = fd; st->linepos = 0; if (flags & YAP_PIPE_STREAM) { st->stream_putc = PipePutc; st->stream_getc = PipeGetc; } else if (flags & YAP_TTY_STREAM) { st->stream_putc = ConsolePutc; st->stream_getc = ConsoleGetc; } else { st->stream_putc = FilePutc; st->stream_getc = PlGetc; unix_upd_stream_info (st); } if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = st->stream_getc; t = MkStream (sno); return (t); } static Int p_open_pipe_stream (void) { Term t1, t2; StreamDesc *st; int sno; #if _MSC_VER || defined(__MINGW32__) HANDLE ReadPipe, WritePipe; SECURITY_ATTRIBUTES satt; satt.nLength = sizeof(satt); satt.lpSecurityDescriptor = NULL; satt.bInheritHandle = TRUE; if (!CreatePipe(&ReadPipe, &WritePipe, &satt, 0)) { return (PlIOError (SYSTEM_ERROR,TermNil, "open_pipe_stream/2 could not create pipe")); } #else int filedes[2]; if (pipe(filedes) != 0) { return (PlIOError (SYSTEM_ERROR,TermNil, "open_pipe_stream/2 could not create pipe")); } #endif sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_pipe_stream/2")); st = &Stream[sno]; st->status = Input_Stream_f | Pipe_Stream_f; st->linepos = 0; st->charcount = 0; st->linecount = 1; st->stream_putc = PipePutc; st->stream_getc = PipeGetc; if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = PipeGetc; #if _MSC_VER || defined(__MINGW32__) st->u.pipe.hdl = ReadPipe; #else st->u.pipe.fd = filedes[0]; #endif sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_pipe_stream/2")); t1 = MkStream (sno); st = &Stream[sno]; st->status = Output_Stream_f | Pipe_Stream_f; st->linepos = 0; st->charcount = 0; st->linecount = 1; st->stream_putc = PipePutc; st->stream_getc = PipeGetc; if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = st->stream_getc; #if _MSC_VER || defined(__MINGW32__) st->u.pipe.hdl = WritePipe; #else st->u.pipe.fd = filedes[1]; #endif t2 = MkStream (sno); return (Yap_unify (ARG1, t1) && Yap_unify (ARG2, t2)); } static int open_buf_read_stream(char *nbuf, Int nchars) { int sno; StreamDesc *st; sno = GetFreeStreamD(); if (sno < 0) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_mem_read_stream/1")); st = &Stream[sno]; /* currently these streams are not seekable */ st->status = Input_Stream_f | InMemory_Stream_f; st->linepos = 0; st->charcount = 0; st->linecount = 1; st->stream_putc = MemPutc; st->stream_getc = MemGetc; if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = MemGetc; st->u.mem_string.pos = 0; st->u.mem_string.buf = nbuf; st->u.mem_string.max_size = nchars; st->u.mem_string.error_handler = NULL; return sno; } static Int p_open_mem_read_stream (void) /* $open_mem_read_stream(+List,-Stream) */ { Term t, ti; int sno; Int sl = 0, nchars = 0; char *nbuf; ti = Deref(ARG1); while (ti != TermNil) { if (IsVarTerm(ti)) { Yap_Error(INSTANTIATION_ERROR, ti, "open_mem_read_stream"); return (FALSE); } else if (!IsPairTerm(ti)) { Yap_Error(TYPE_ERROR_LIST, ti, "open_mem_read_stream"); return (FALSE); } else { sl++; ti = TailOfTerm(ti); } } while ((nbuf = (char *)Yap_AllocAtomSpace((sl+1)*sizeof(char))) == NULL) { if (!Yap_growheap(FALSE, (sl+1)*sizeof(char), NULL)) { Yap_Error(OUT_OF_HEAP_ERROR, TermNil, Yap_ErrorMessage); return(FALSE); } } ti = Deref(ARG1); while (ti != TermNil) { Term ts = HeadOfTerm(ti); if (IsVarTerm(ts)) { Yap_Error(INSTANTIATION_ERROR, ARG1, "open_mem_read_stream"); return (FALSE); } else if (!IsIntTerm(ts)) { Yap_Error(TYPE_ERROR_INTEGER, ARG1, "open_mem_read_stream"); return (FALSE); } nbuf[nchars++] = IntOfTerm(ts); ti = TailOfTerm(ti); } nbuf[nchars] = '\0'; sno = open_buf_read_stream(nbuf, nchars); t = MkStream (sno); return (Yap_unify (ARG2, t)); } static int open_buf_write_stream(char *nbuf, UInt sz) { int sno; StreamDesc *st; sno = GetFreeStreamD(); if (sno < 0) return -1; st = &Stream[sno]; /* currently these streams are not seekable */ st->status = Output_Stream_f | InMemory_Stream_f; st->linepos = 0; st->charcount = 0; st->linecount = 1; st->stream_putc = MemPutc; st->stream_getc = MemGetc; if (CharConversionTable != NULL) st->stream_getc_for_read = ISOGetc; else st->stream_getc_for_read = MemGetc; st->u.mem_string.pos = 0; st->u.mem_string.buf = nbuf; st->u.mem_string.max_size = sz; return sno; } static Int p_open_mem_write_stream (void) /* $open_mem_write_stream(-Stream) */ { Term t; int sno; char *nbuf; extern int Yap_page_size; while ((nbuf = (char *)Yap_AllocAtomSpace(Yap_page_size*sizeof(char))) == NULL) { if (!Yap_growheap(FALSE, Yap_page_size*sizeof(char), NULL)) { Yap_Error(OUT_OF_HEAP_ERROR, TermNil, Yap_ErrorMessage); return(FALSE); } } sno = open_buf_write_stream(nbuf, Yap_page_size); if (sno == -1) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_mem_read_stream/1")); t = MkStream (sno); return (Yap_unify (ARG1, t)); } static void ExtendAliasArray(void) { AliasDesc new; UInt new_size = SzOfFileAliases+ALIASES_BLOCK_SIZE; new = (AliasDesc)Yap_AllocCodeSpace(sizeof(AliasDesc *)*new_size); memcpy((void *)new, (void *)FileAliases, sizeof(AliasDesc *)*SzOfFileAliases); Yap_FreeCodeSpace((ADDR)FileAliases); FileAliases = new; SzOfFileAliases = new_size; } /* create a new alias arg for stream sno */ static int AddAlias (Atom arg, int sno) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases; while (aliasp < aliasp_max) { if (aliasp->name == arg) { if (aliasp->alias_stream != sno) { return(FALSE); } return(TRUE); } aliasp++; } /* we have not found an alias neither a hole */ if (aliasp == FileAliases+SzOfFileAliases) ExtendAliasArray(); NOfFileAliases++; aliasp->name = arg; aliasp->alias_stream = sno; return(TRUE); } /* create a new alias arg for stream sno */ static void SetAlias (Atom arg, int sno) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases; while (aliasp < aliasp_max) { if (aliasp->name == arg) { Int alno = aliasp-FileAliases; aliasp->alias_stream = sno; if (!(Stream[sno].status & (Null_Stream_f|InMemory_Stream_f|Socket_Stream_f))) { switch(alno) { case 0: Yap_stdin = Stream[sno].u.file.file; break; case 1: Yap_stdout = Stream[sno].u.file.file; break; case 2: Yap_stderr = Stream[sno].u.file.file; break; default: break; } #if HAVE_SETBUF YP_setbuf (Stream[sno].u.file.file, NULL); #endif /* HAVE_SETBUF */ } return; } aliasp++; } /* we have not found an alias, create one */ if (aliasp == FileAliases+SzOfFileAliases) ExtendAliasArray(); NOfFileAliases++; aliasp->name = arg; aliasp->alias_stream = sno; } /* purge all aliases for stream sno */ static void PurgeAlias (int sno) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases, new_aliasp = aliasp; while (aliasp < aliasp_max) { if (aliasp->alias_stream == sno) { if (aliasp - FileAliases < 3) { /* get back to std streams, but keep alias around */ Int alno = aliasp-FileAliases; new_aliasp->alias_stream = alno; switch(alno) { case 0: Yap_stdin = stdin; break; case 1: Yap_stdout = stdout; break; case 2: Yap_stderr = stderr; break; default: break; /* just put something here */ } new_aliasp++; } else { NOfFileAliases--; } } else { /* avoid holes in alias array */ if (new_aliasp != aliasp) { new_aliasp->alias_stream = aliasp->alias_stream; new_aliasp->name = aliasp->name; } new_aliasp++; } aliasp++; } } /* check if name is an alias */ static int CheckAlias (Atom arg) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases; while (aliasp < aliasp_max) { if (aliasp->name == arg) { return(aliasp->alias_stream); } aliasp++; } return(-1); } /* check if stream has an alias */ static Atom FetchAlias (int sno) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases; while (aliasp < aliasp_max) { if (aliasp->alias_stream == sno) { return(aliasp->name); } aliasp++; } return(AtomFoundVar); } /* check if arg is an alias */ static int FindAliasForStream (int sno, Atom al) { AliasDesc aliasp = FileAliases, aliasp_max = FileAliases+NOfFileAliases; while (aliasp < aliasp_max) { if (aliasp->alias_stream == sno && aliasp->name == al) { return(TRUE); } aliasp++; } return(FALSE); } static int CheckStream (Term arg, int kind, char *msg) { int sno = -1; arg = Deref (arg); if (IsVarTerm (arg)) { Yap_Error(INSTANTIATION_ERROR, arg, msg); return (-1); } else if (IsAtomTerm (arg)) { Atom sname = AtomOfTerm (arg); if (sname == AtomUser) { if (kind & Input_Stream_f) { if (kind & (Output_Stream_f|Append_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_STREAM, arg, "ambiguous use of 'user' as a stream"); return (-1); } sname = AtomUsrIn; } else { sname = AtomUsrOut; } } if ((sno = CheckAlias(sname)) == -1) { Yap_Error(EXISTENCE_ERROR_STREAM, arg, msg); return(-1); } } else if (IsApplTerm (arg) && FunctorOfTerm (arg) == FunctorStream) { arg = ArgOfTerm (1, arg); if (!IsVarTerm (arg) && IsIntTerm (arg)) sno = IntOfTerm (arg); } if (sno < 0) { Yap_Error(DOMAIN_ERROR_STREAM_OR_ALIAS, arg, msg); return (-1); } if (Stream[sno].status & Free_Stream_f) { Yap_Error(EXISTENCE_ERROR_STREAM, arg, msg); return (-1); } if ((Stream[sno].status & kind) == 0) { if (kind & Input_Stream_f) Yap_Error(PERMISSION_ERROR_INPUT_STREAM, arg, msg); else Yap_Error(PERMISSION_ERROR_OUTPUT_STREAM, arg, msg); return (-1); } return (sno); } static Int p_check_stream (void) { /* '$check_stream'(Stream,Mode) */ Term mode = Deref (ARG2); return (CheckStream (ARG1, AtomOfTerm (mode) == AtomRead ? Input_Stream_f : Output_Stream_f, "check_stream/2") != -1); } static Int p_check_if_stream (void) { /* '$check_stream'(Stream) */ return (CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f | Socket_Stream_f, "check_stream/1") != -1); } static Term StreamName(int i) { if (i < 3) return(MkAtomTerm(AtomUser)); #if USE_SOCKET if (Stream[i].status & Socket_Stream_f) return(MkAtomTerm(Yap_LookupAtom("socket"))); else #endif if (Stream[i].status & Pipe_Stream_f) return(MkAtomTerm(Yap_LookupAtom("pipe"))); if (Stream[i].status & InMemory_Stream_f) return(MkAtomTerm(Yap_LookupAtom("charsio"))); else { if (yap_flags[LANGUAGE_MODE_FLAG] == ISO_CHARACTER_ESCAPES) { return(Stream[i].u.file.user_name); } else return(MkAtomTerm(Stream[i].u.file.name)); } } static Int init_cur_s (void) { /* Init current_stream */ Term t3 = Deref(ARG3); if (!IsVarTerm(t3)) { Int i; Term t1, t2; i = CheckStream (t3, Input_Stream_f|Output_Stream_f, "current_stream/3"); if (i < 0) { return(FALSE); } t1 = StreamName(i); t2 = (Stream[i].status & Input_Stream_f ? MkAtomTerm (AtomRead) : MkAtomTerm (AtomWrite)); if (Yap_unify(ARG1,t1) && Yap_unify(ARG2,t2)) { cut_succeed(); } else { cut_fail(); } } else { EXTRA_CBACK_ARG (3, 1) = MkIntTerm (0); return (cont_cur_s ()); } } static Int cont_cur_s (void) { /* current_stream */ Term t1, t2, t3; int i = IntOfTerm (EXTRA_CBACK_ARG (3, 1)); while (i < MaxStreams) { if (Stream[i].status & Free_Stream_f) { ++i; continue; } t1 = StreamName(i); t2 = (Stream[i].status & Input_Stream_f ? MkAtomTerm (AtomRead) : MkAtomTerm (AtomWrite)); t3 = MkStream (i++); EXTRA_CBACK_ARG (3, 1) = Unsigned (MkIntTerm (i)); if (Yap_unify (ARG3, t3) && Yap_unify_constant (ARG1, t1) && Yap_unify_constant (ARG2, t2)) { return (TRUE); } else { return(FALSE); } } cut_fail(); } /* * Called when you want to close all open streams, except for stdin, stdout * and stderr */ void Yap_CloseStreams (int loud) { int sno; for (sno = 3; sno < MaxStreams; ++sno) { if (Stream[sno].status & Free_Stream_f) continue; if ((Stream[sno].status & Popen_Stream_f)) pclose (Stream[sno].u.file.file); #if _MSC_VER || defined(__MINGW32__) if (Stream[sno].status & Pipe_Stream_f) CloseHandle (Stream[sno].u.pipe.hdl); #else if (Stream[sno].status & (Pipe_Stream_f|Socket_Stream_f)) close (Stream[sno].u.pipe.fd); #endif #if USE_SOCKET else if (Stream[sno].status & (Socket_Stream_f)) { Yap_CloseSocket(Stream[sno].u.socket.fd, Stream[sno].u.socket.flags, Stream[sno].u.socket.domain); } #endif else if (Stream[sno].status & InMemory_Stream_f) { Yap_FreeAtomSpace(Stream[sno].u.mem_string.buf); } else if (!(Stream[sno].status & Null_Stream_f)) YP_fclose (Stream[sno].u.file.file); else { if (loud) fprintf (Yap_stderr, "%% YAP Error: while closing stream: %s\n", RepAtom (Stream[sno].u.file.name)->StrOfAE); } if (Yap_c_input_stream == sno) { Yap_c_input_stream = StdInStream; } else if (Yap_c_output_stream == sno) { Yap_c_output_stream = StdOutStream; } Stream[sno].status = Free_Stream_f; } } static void CloseStream(int sno) { if (!(Stream[sno].status & (Null_Stream_f|Socket_Stream_f|InMemory_Stream_f|Pipe_Stream_f))) YP_fclose (Stream[sno].u.file.file); #if USE_SOCKET else if (Stream[sno].status & (Socket_Stream_f)) { Yap_CloseSocket(Stream[sno].u.socket.fd, Stream[sno].u.socket.flags, Stream[sno].u.socket.domain); } #endif else if (Stream[sno].status & Pipe_Stream_f) { #if _MSC_VER || defined(__MINGW32__) CloseHandle (Stream[sno].u.pipe.hdl); #else close(Stream[sno].u.pipe.fd); #endif } else if (Stream[sno].status & (InMemory_Stream_f)) { Yap_FreeAtomSpace(Stream[sno].u.mem_string.buf); } Stream[sno].status = Free_Stream_f; PurgeAlias(sno); if (Yap_c_input_stream == sno) { Yap_c_input_stream = StdInStream; } else if (Yap_c_output_stream == sno) { Yap_c_output_stream = StdOutStream; } /* if (st->status == Socket_Stream_f|Input_Stream_f|Output_Stream_f) { Yap_CloseSocket(); } */ } void Yap_CloseStream(int sno) { CloseStream(sno); } static Int p_close (void) { /* '$close'(+Stream) */ Int sno = CheckStream (ARG1, (Input_Stream_f | Output_Stream_f | Socket_Stream_f), "close/2"); if (sno < 0) return (FALSE); if (sno <= StdErrStream) return (TRUE); CloseStream(sno); return (TRUE); } static Int p_peek_mem_write_stream (void) { /* '$peek_mem_write_stream'(+Stream,?S0,?S) */ Int sno = CheckStream (ARG1, (Output_Stream_f | InMemory_Stream_f), "close/2"); Int i = Stream[sno].u.mem_string.pos; Term tf = ARG2; CELL *HI; if (sno < 0) return (FALSE); restart: HI = H; while (i > 0) { --i; tf = MkPairTerm(MkIntTerm(Stream[sno].u.mem_string.buf[i]),tf); if (H + 1024 >= ASP) { H = HI; if (!Yap_gc(3, ENV, P)) { Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage); return(FALSE); } i = 0; tf = ARG2; goto restart; } } return (Yap_unify(ARG3,tf)); } static Int p_past_eof (void) { /* at_end_of_stream */ /* the next character is a EOF */ int sno = CheckStream (ARG1, Input_Stream_f, "past_eof/1"); if (sno < 0) return (FALSE); return(Stream[sno].status & Eof_Stream_f); } static Int p_peek_byte (void) { /* at_end_of_stream */ /* the next character is a EOF */ int sno = CheckStream (ARG1, Input_Stream_f, "peek/2"); StreamDesc *s; Int ocharcount, olinecount, olinepos; Int status; Int ch; if (sno < 0) return(FALSE); status = Stream[sno].status; if (!(status & Binary_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "peek/2"); return(FALSE); } if (status & Eof_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "peek/2"); return(FALSE); } s = Stream+sno; ocharcount = s->charcount; olinecount = s->linecount; olinepos = s->linepos; ch = Stream[sno].stream_getc(sno); s->charcount = ocharcount; s->linecount = olinecount; s->linepos = olinepos; /* buffer the character */ s->och = ch; /* mark a special function to recover this character */ s->stream_getc = PlUnGetc; if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; return(Yap_unify_constant(ARG2,MkIntTerm(ch))); } static Int p_peek (void) { /* at_end_of_stream */ /* the next character is a EOF */ int sno = CheckStream (ARG1, Input_Stream_f, "peek/2"); StreamDesc *s; Int ocharcount, olinecount, olinepos; Int status; Int ch; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "peek/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "peek/2"); return(FALSE); } } s = Stream+sno; ocharcount = s->charcount; olinecount = s->linecount; olinepos = s->linepos; ch = Stream[sno].stream_getc(sno); s->charcount = ocharcount; s->linecount = olinecount; s->linepos = olinepos; /* buffer the character */ s->och = ch; /* mark a special function to recover this character */ s->stream_getc = PlUnGetc; if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; return(Yap_unify_constant(ARG2,MkIntTerm(ch))); } static Int p_set_input (void) { /* '$set_input'(+Stream,-ErrorMessage) */ Int sno = CheckStream (ARG1, Input_Stream_f, "set_input/1"); if (sno < 0) return (FALSE); Yap_c_input_stream = sno; return (TRUE); } static Int p_set_output (void) { /* '$set_output'(+Stream,-ErrorMessage) */ Int sno = CheckStream (ARG1, Output_Stream_f, "set_output/1"); if (sno < 0) return (FALSE); Yap_c_output_stream = sno; return (TRUE); } static Int p_current_input (void) { /* current_input(?Stream) */ Term t1 = Deref(ARG1); if (IsVarTerm(t1)) { Term t = MkStream (Yap_c_input_stream); BIND(VarOfTerm(t1), t, bind_in_current_input); #ifdef COROUTINING DO_TRAIL(CellPtr(t1), t); if (CellPtr(t1) < H0) Yap_WakeUp(VarOfTerm(t1)); bind_in_current_input: #endif return(TRUE); } else if (!IsApplTerm(t1) || FunctorOfTerm(t1) != FunctorStream || !IsIntTerm((t1=ArgOfTerm(1,t1)))) { Yap_Error(DOMAIN_ERROR_STREAM,t1,"current_input/1"); return(FALSE); } else { return(Yap_c_input_stream == IntOfTerm(t1)); } } static Int p_current_output (void) { /* current_output(?Stream) */ Term t1 = Deref(ARG1); if (IsVarTerm(t1)) { Term t = MkStream (Yap_c_output_stream); BIND((CELL *)t1, t, bind_in_current_output); #ifdef COROUTINING DO_TRAIL(CellPtr(t1), t); if (CellPtr(t1) < H0) Yap_WakeUp(VarOfTerm(t1)); bind_in_current_output: #endif return(TRUE); } else if (!IsApplTerm(t1) || FunctorOfTerm(t1) != FunctorStream || !IsIntTerm((t1=ArgOfTerm(1,t1)))) { Yap_Error(DOMAIN_ERROR_STREAM,t1,"current_output/1"); return(FALSE); } else { return(Yap_c_output_stream == IntOfTerm(t1)); } } static Int p_write (void) { /* '$write'(+Flags,?Term) */ int flags = (int) IntOfTerm (Deref (ARG1)); /* notice: we must have ASP well set when using portray, otherwise we cannot make recursive Prolog calls */ Yap_StartSlots(); Yap_plwrite (ARG2, Stream[Yap_c_output_stream].stream_putc, flags); if (EX != 0L) { Term ball = EX; EX = 0L; Yap_JumpToEnv(ball); return(FALSE); } return (TRUE); } static Int p_write2 (void) { /* '$write'(+Stream,+Flags,?Term) */ int old_output_stream = Yap_c_output_stream; Yap_c_output_stream = CheckStream (ARG1, Output_Stream_f, "write/2"); if (Yap_c_output_stream == -1) { Yap_c_output_stream = old_output_stream; return(FALSE); } /* notice: we must have ASP well set when using portray, otherwise we cannot make recursive Prolog calls */ Yap_StartSlots(); Yap_plwrite (ARG3, Stream[Yap_c_output_stream].stream_putc, (int) IntOfTerm (Deref (ARG2))); Yap_c_output_stream = old_output_stream; if (EX != 0L) { Term ball = EX; EX = 0L; Yap_JumpToEnv(ball); return(FALSE); } return (TRUE); } static void clean_vars(VarEntry *p) { if (p == NULL) return; p->VarAdr = TermNil; clean_vars(p->VarLeft); clean_vars(p->VarRight); } static Term syntax_error (TokEntry * tokptr) { Term info; int count = 0, out = 0; Int start, err = 0, end; Term tf[6]; Term *error = tf+3; CELL *Hi = H; start = tokptr->TokPos; clean_vars(Yap_VarTable); clean_vars(Yap_AnonVarTable); while (1) { Term ts[2]; if (H > ASP-1024) { tf[3] = TermNil; err = 0; end = 0; /* for some reason moving this earlier confuses gcc on solaris */ H = Hi; break; } if (tokptr == Yap_toktide) { err = tokptr->TokPos; out = count; } info = tokptr->TokInfo; switch (tokptr->Tok) { case Name_tok: { Term t0[1]; t0[0] = MkAtomTerm((Atom)info); ts[0] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("atom"),1),1,t0); } break; case Number_tok: ts[0] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("number"),1),1,&(tokptr->TokInfo)); break; case Var_tok: { Term t[3]; VarEntry *varinfo = (VarEntry *)info; t[0] = MkIntTerm(0); t[1] = Yap_StringToList(varinfo->VarRep); if (varinfo->VarAdr == TermNil) { t[2] = varinfo->VarAdr = MkVarTerm(); } else { t[2] = varinfo->VarAdr; } ts[0] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("var"),3),3,t); } break; case String_tok: { Term t0 = Yap_StringToList((char *)info); ts[0] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("string"),1),1,&t0); } break; case Error_tok: break; case Ponctuation_tok: { char s[2]; s[1] = '\0'; if (Ord (info) == 'l') { s[0] = '('; } else { s[0] = (char)info; } ts[0] = MkAtomTerm(Yap_LookupAtom(s)); } } if (tokptr->Tok == Ord (eot_tok)) { *error = TermNil; end = tokptr->TokPos; break; } else if (tokptr->Tok != Ord (Error_tok)) { ts[1] = MkIntegerTerm(tokptr->TokPos); *error = MkPairTerm(Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("-"),2),2,ts),TermNil); error = RepPair(*error)+1; count++; } tokptr = tokptr->TokNext; } tf[0] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("read"),1),1,&ARG2); { Term t[3]; t[0] = MkIntegerTerm(start); t[1] = MkIntegerTerm(err); t[2] = MkIntegerTerm(end); tf[1] = Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("between"),3),3,t); } tf[2] = MkAtomTerm(Yap_LookupAtom("\n<==== HERE ====>\n")); tf[4] = MkIntegerTerm(out); tf[5] = MkIntegerTerm(err); return(Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("syntax_error"),6),6,tf)); } Int Yap_FirstLineInParse (void) { return(StartLine); } static Int p_startline (void) { return (Yap_unify_constant (ARG1, MkIntegerTerm (StartLine))); } /* control the parser error handler */ static Int p_set_read_error_handler(void) { Term t = Deref(ARG1); char *s; if (IsVarTerm(t)) { Yap_Error(INSTANTIATION_ERROR,t,"set_read_error_handler"); return(FALSE); } if (!IsAtomTerm(t)) { Yap_Error(TYPE_ERROR_ATOM,t,"bad syntax_error handler"); return(FALSE); } s = RepAtom(AtomOfTerm(t))->StrOfAE; if (!strcmp(s, "fail")) { ParserErrorStyle = FAIL_ON_PARSER_ERROR; } else if (!strcmp(s, "error")) { ParserErrorStyle = EXCEPTION_ON_PARSER_ERROR; } else if (!strcmp(s, "quiet")) { ParserErrorStyle = QUIET_ON_PARSER_ERROR; } else if (!strcmp(s, "dec10")) { ParserErrorStyle = CONTINUE_ON_PARSER_ERROR; } else { Yap_Error(DOMAIN_ERROR_SYNTAX_ERROR_HANDLER,t,"bad syntax_error handler"); return(FALSE); } return(TRUE); } /* return the status for the parser error handler */ static Int p_get_read_error_handler(void) { Term t; switch (ParserErrorStyle) { case FAIL_ON_PARSER_ERROR: t = MkAtomTerm(Yap_LookupAtom("fail")); break; case EXCEPTION_ON_PARSER_ERROR: t = MkAtomTerm(Yap_LookupAtom("error")); break; case QUIET_ON_PARSER_ERROR: t = MkAtomTerm(Yap_LookupAtom("quiet")); break; case CONTINUE_ON_PARSER_ERROR: t = MkAtomTerm(Yap_LookupAtom("dec10")); break; default: Yap_Error(SYSTEM_ERROR,TermNil,"corrupted syntax_error handler"); return(FALSE); } return (Yap_unify_constant (ARG1, t)); } static Int do_read(int inp_stream) { Term t, v; TokEntry *tokstart; #if EMACS int emacs_cares = FALSE; #endif if (Stream[inp_stream].status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, MkAtomTerm(Stream[inp_stream].u.file.name), "read_term/2"); return(FALSE); } while (TRUE) { CELL *old_H; /* Scans the term using stack space */ Yap_eot_before_eof = FALSE; tokstart = Yap_tokptr = Yap_toktide = Yap_tokenizer (inp_stream); /* preserve value of H after scanning: otherwise we may lose strings and floats */ old_H = H; if (Stream[inp_stream].status & Eof_Stream_f) { if (Yap_eot_before_eof) { /* next read should give out an end of file */ Stream[inp_stream].status |= Push_Eof_Stream_f; } else { if (tokstart != NIL && tokstart->Tok != Ord (eot_tok)) { /* we got the end of file from an abort */ if (Yap_ErrorMessage == "Abort") { Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return FALSE; } /* we need to force the next reading to also give end of file.*/ Stream[inp_stream].status |= Push_Eof_Stream_f; Yap_ErrorMessage = "end of file found before end of term"; } else { Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return (Yap_unify(MkIntegerTerm(StartLine = Stream[inp_stream].linecount),ARG4) && Yap_unify_constant (ARG2, MkAtomTerm (AtomEof))); } } } repeat_cycle: if (Yap_ErrorMessage || (t = Yap_Parse()) == 0) { if (Yap_ErrorMessage && (strcmp(Yap_ErrorMessage,"Stack Overflow") == 0)) { /* ignore term we just built */ tr_fr_ptr old_TR = TR; H = old_H; TR = (tr_fr_ptr)ScannerStack; if (Yap_growstack_in_parser(&old_TR, &tokstart, &Yap_VarTable)) { ScannerStack = (char *)TR; TR = old_TR; old_H = H; Yap_tokptr = Yap_toktide = tokstart; Yap_ErrorMessage = NULL; goto repeat_cycle; } ScannerStack = (char *)TR; TR = old_TR; } if (ParserErrorStyle == QUIET_ON_PARSER_ERROR) { /* just fail */ Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return FALSE; } else if (ParserErrorStyle == CONTINUE_ON_PARSER_ERROR) { Yap_ErrorMessage = NULL; /* try again */ goto repeat_cycle; } else { Term terr = syntax_error(tokstart); if (Yap_ErrorMessage == NULL) Yap_ErrorMessage = "SYNTAX ERROR"; if (ParserErrorStyle == EXCEPTION_ON_PARSER_ERROR) { Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); Yap_Error(SYNTAX_ERROR,terr,Yap_ErrorMessage); return FALSE; } else /* FAIL ON PARSER ERROR */ { Term t[2], t1; t[0] = terr; t[1] = MkAtomTerm(Yap_LookupAtom(Yap_ErrorMessage)); t1 = MkIntegerTerm(StartLine = tokstart->TokPos); Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return(Yap_unify(t1,ARG4) && Yap_unify(ARG5,Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("error"),2),2,t))); } } } else { /* parsing succeeded */ break; } } #if EMACS first_char = tokstart->TokPos; #endif /* EMACS */ if (AtomOfTerm (Deref (ARG1)) == AtomTrue) { while (TRUE) { CELL *old_H = H; if (setjmp(Yap_IOBotch) == 0) { v = Yap_VarNames(Yap_VarTable, TermNil); break; } else { tr_fr_ptr old_TR = TR; /* don't need to recheck tokens */ tokstart = NULL; /* restart global */ H = old_H; TR = (tr_fr_ptr)ScannerStack; Yap_growstack_in_parser(&old_TR, &tokstart, &Yap_VarTable); ScannerStack = (char *)TR; TR = old_TR; old_H = H; } } Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return(Yap_unify(t, ARG2) && Yap_unify (v, ARG3) && Yap_unify(MkIntTerm(StartLine = tokstart->TokPos),ARG4)); } else { Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return(Yap_unify(t, ARG2) && Yap_unify(MkIntTerm(StartLine = tokstart->TokPos),ARG4)); } } static Int p_read (void) { /* '$read'(+Flag,?Term,?Vars,-Pos,-Err) */ return(do_read(Yap_c_input_stream)); } static Int p_read2 (void) { /* '$read2'(+Flag,?Term,?Vars,-Pos,-Err,+Stream) */ int inp_stream; /* needs to change Yap_c_output_stream for write */ inp_stream = CheckStream (ARG6, Input_Stream_f, "read/3"); if (inp_stream == -1) { return(FALSE); } return(do_read(inp_stream)); } static Int p_user_file_name (void) { Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f,"user_file_name/2"); if (sno < 0) return (FALSE); #if USE_SOCKET if (Stream[sno].status & Socket_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("socket")); else #endif if (Stream[sno].status & Pipe_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("pipe")); else if (Stream[sno].status & InMemory_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("charsio")); else tout = Stream[sno].u.file.user_name; return (Yap_unify_constant (ARG2, tout)); } static Int p_file_name (void) { Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f,"file_name/2"); if (sno < 0) return (FALSE); #if USE_SOCKET if (Stream[sno].status & Socket_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("socket")); else #endif if (Stream[sno].status & Pipe_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("pipe")); else if (Stream[sno].status & InMemory_Stream_f) tout = MkAtomTerm(Yap_LookupAtom("charsio")); else tout = MkAtomTerm(Stream[sno].u.file.name); return (Yap_unify_constant (ARG2, tout)); } static Int p_cur_line_no (void) { /* '$current_line_number'(+Stream,-N) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f,"current_line_number/2"); if (sno < 0) return (FALSE); /* one has to be somewhat more careful because of terminals */ if (Stream[sno].status & Tty_Stream_f) { Int no = 1; int i; Atom my_stream; #if USE_SOCKET if (Stream[sno].status & Socket_Stream_f) my_stream = Yap_LookupAtom("socket"); else #endif if (Stream[sno].status & Pipe_Stream_f) my_stream = Yap_LookupAtom("pipe"); else if (Stream[sno].status & InMemory_Stream_f) my_stream = Yap_LookupAtom("charsio"); else my_stream = Stream[sno].u.file.name; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & (Free_Stream_f|Socket_Stream_f|Pipe_Stream_f|InMemory_Stream_f)) && Stream[i].u.file.name == my_stream) no += Stream[i].linecount - 1; } tout = MkIntTerm (no); } else tout = MkIntTerm (Stream[sno].linecount); return (Yap_unify_constant (ARG2, tout)); } static Int p_line_position (void) { /* '$line_position'(+Stream,-N) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "line_position/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & Tty_Stream_f) { Int no = 0; int i; Atom my_stream = Stream[sno].u.file.name; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & Free_Stream_f) && Stream[i].u.file.name == my_stream) no += Stream[i].linepos; } tout = MkIntTerm (no); } else tout = MkIntTerm (Stream[sno].linepos); return (Yap_unify_constant (ARG2, tout)); } static Int p_character_count (void) { /* '$character_count'(+Stream,-N) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "character_count/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & Tty_Stream_f) { Int no = 0; int i; Atom my_stream = Stream[sno].u.file.name; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & Free_Stream_f) && Stream[i].u.file.name == my_stream) no += Stream[i].charcount; } tout = MkIntTerm (no); } else if (Stream[sno].status & Null_Stream_f) tout = MkIntTerm (Stream[sno].charcount); else tout = MkIntTerm (YP_ftell (Stream[sno].u.file.file)); return (Yap_unify_constant (ARG2, tout)); } static Int p_show_stream_flags(void) { /* '$show_stream_flags'(+Stream,Pos) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "stream_property/2"); if (sno < 0) return (FALSE); tout = MkIntTerm(Stream[sno].status); return (Yap_unify (ARG2, tout)); } static Int p_show_stream_position (void) { /* '$show_stream_position'(+Stream,Pos) */ Term sargs[3], tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "stream_position/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & (Tty_Stream_f|Socket_Stream_f|Pipe_Stream_f|InMemory_Stream_f)) sargs[0] = MkIntTerm (Stream[sno].charcount); else if (Stream[sno].status & Null_Stream_f) sargs[0] = MkIntTerm (Stream[sno].charcount); else sargs[0] = MkIntTerm (YP_ftell (Stream[sno].u.file.file)); sargs[1] = MkIntTerm (Stream[sno].linecount); sargs[2] = MkIntTerm (Stream[sno].linepos); tout = Yap_MkApplTerm (FunctorStreamPos, 3, sargs); return (Yap_unify (ARG2, tout)); } static Int p_set_stream_position (void) { /* '$set_stream_position'(+Stream,Pos) */ Term tin, tp; Int char_pos; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "set_stream_position/2"); if (sno < 0) { return (FALSE); } tin = Deref (ARG2); if (IsVarTerm (tin)) { Yap_Error(INSTANTIATION_ERROR, tin, "set_stream_position/2"); return (FALSE); } else if (!(IsApplTerm (tin))) { Yap_Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (FunctorOfTerm (tin) == FunctorStreamPos) { if (IsVarTerm (tp = ArgOfTerm (1, tin))) { Yap_Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { Yap_Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (!(Stream[sno].status & Seekable_Stream_f) ) { Yap_Error(PERMISSION_ERROR_REPOSITION_STREAM, ARG1,"set_stream_position/2"); return(FALSE); } char_pos = IntOfTerm (tp); if (IsVarTerm (tp = ArgOfTerm (2, tin))) { Yap_Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { Yap_Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } Stream[sno].charcount = char_pos; Stream[sno].linecount = IntOfTerm (tp); if (IsVarTerm (tp = ArgOfTerm (2, tin))) { Yap_Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { Yap_Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } Stream[sno].linepos = IntOfTerm (tp); if (YP_fseek (Stream[sno].u.file.file, (long) (char_pos), 0) == -1) { Yap_Error(SYSTEM_ERROR, tp, "fseek failed for set_stream_position/2"); return(FALSE); } } else if (FunctorOfTerm (tin) == FunctorStreamEOS) { if (IsVarTerm (tp = ArgOfTerm (1, tin))) { Yap_Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (tp != MkAtomTerm(Yap_LookupAtom("at"))) { Yap_Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (!(Stream[sno].status & Seekable_Stream_f) ) { Yap_Error(PERMISSION_ERROR_REPOSITION_STREAM, ARG1,"set_stream_position/2"); return(FALSE); } if (YP_fseek (Stream[sno].u.file.file, 0L, SEEK_END) == -1) { Yap_Error(SYSTEM_ERROR, tp, "fseek failed for set_stream_position/2"); return(FALSE); } /* reset the counters */ Stream[sno].linepos = 0; Stream[sno].linecount = 0; Stream[sno].charcount = 0; } return (TRUE); } static Int p_get (void) { /* '$get'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get/2"); Int ch; Int status; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get/2"); return(FALSE); } else if (status & Eof_Error_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get/2"); return(FALSE); } } while ((ch = Stream[sno].stream_getc(sno)) <= 32 && ch >= 0); return (Yap_unify_constant (ARG2, MkIntTerm (ch))); } static Int p_get0 (void) { /* '$get0'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get0/2"); Int status; Int out; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get0/2"); return(FALSE); } } out = Stream[sno].stream_getc(sno); return (Yap_unify_constant (ARG2, MkIntTerm (out)) ); } static Term read_line(int sno) { Term tail; Int ch; if ((ch = Stream[sno].stream_getc(sno)) == 10) { return(TermNil); } tail = read_line(sno); return(MkPairTerm(MkIntTerm(ch),tail)); } static Int p_get0_line_codes (void) { /* '$get0'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get0/2"); Int status; Term out; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get0/2"); return(FALSE); } } out = read_line(sno); return(Yap_unify(out,ARG2)); } static Int p_get_byte (void) { /* '$get_byte'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get_byte/2"); Int status; if (sno < 0) return(FALSE); status = Stream[sno].status; if (!(status & Binary_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_TEXT_STREAM, ARG1, "get_byte/2"); return(FALSE); } if ((status & (Eof_Stream_f|Eof_Error_Stream_f)) == (Eof_Stream_f|Eof_Error_Stream_f)) { Yap_Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get_byte/2"); return(FALSE); } return (Yap_unify_constant (ARG2, MkIntTerm (Stream[sno].stream_getc(sno)))); } static Int p_put (void) { /* '$put'(Stream,N) */ int sno = CheckStream (ARG1, Output_Stream_f, "put/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & Binary_Stream_f) { Yap_Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } Stream[sno].stream_putc (sno, (int) IntOfTerm (Deref (ARG2))); /* * if (!(Stream[sno].status & Null_Stream_f)) * yap_fflush(Stream[sno].u.file.file); */ return (TRUE); } static Int p_put_byte (void) { /* '$put_byte'(Stream,N) */ int sno = CheckStream (ARG1, Output_Stream_f, "put/2"); if (sno < 0) return (FALSE); if (!(Stream[sno].status & Binary_Stream_f)) { Yap_Error(PERMISSION_ERROR_OUTPUT_TEXT_STREAM, ARG1, "get0/2"); return(FALSE); } Stream[sno].stream_putc(sno, (int) IntOfTerm (Deref (ARG2))); /* * if (!(Stream[sno].status & Null_Stream_f)) * yap_fflush(Stream[sno].u.file.file); */ return (TRUE); } static int format_error = FALSE; #define FORMAT_MAX_SIZE 256 static char *format_ptr, *format_base, *format_max; static int format_buf_size; typedef struct { Int pos; /* tab point */ char pad; /* ok, it's not standard english */ } pads; static pads pad_entries[16], *pad_max = pad_entries; static int format_putc(int sno, int ch) { if (format_buf_size == -1) return(EOF); if (ch == 10) { char *ptr = format_base; #if MAC || _MSC_VER ch = '\n'; #endif for (ptr = format_base; ptr < format_ptr; ptr++) { Stream[sno].stream_putc(sno, *ptr); } /* reset line */ format_ptr = format_base; pad_max = pad_entries; Stream[sno].stream_putc(sno, '\n'); return((int)10); } else { *format_ptr++ = (char)ch; if (format_ptr == format_max) { /* oops, we have reached an overflow */ Int new_max_size = format_buf_size + FORMAT_MAX_SIZE; char *newbuf; if ((newbuf = Yap_AllocAtomSpace(new_max_size*sizeof(char))) == NULL) { format_buf_size = -1; Yap_Error(SYSTEM_ERROR, TermNil, "YAP could not grow heap for format/2"); return(EOF); } #if HAVE_MEMMOVE memmove((void *)newbuf, (void *)format_base, (size_t)((format_ptr-format_base)*sizeof(char))); #else { Int n = format_ptr-format_base; char *to = newbuf; char *from = format_base; while (n-- >= 0) { *to++ = *from++; } } #endif Yap_FreeAtomSpace(format_base); format_ptr = newbuf+(format_ptr-format_base); format_base = newbuf; format_max = newbuf+new_max_size; format_buf_size = new_max_size; if (ActiveSignals & YAP_CDOVF_SIGNAL) { if (!Yap_growheap(FALSE, 0, NULL)) { Yap_Error(OUT_OF_HEAP_ERROR, TermNil, "YAP failed to grow heap at format"); } } } } return ((int) ch); } static void fill_pads(int nchars) { int nfillers, fill_space, lfill_space; if (nchars <= 0) return; /* ignore */ nfillers = pad_max-pad_entries; if (nfillers == 0) { /* OK, just pad with spaces */ while (nchars--) { *format_ptr++ = ' '; } return; } fill_space = nchars/nfillers; lfill_space = nchars%nfillers; if (fill_space) { pads *padi = pad_max; while (padi > pad_entries) { char *start_pos; int n, i; padi--; start_pos = format_base+padi->pos; n = format_ptr-start_pos; #if HAVE_MEMMOVE memmove((void *)(start_pos+fill_space), (void *)start_pos, (size_t)(n*sizeof(char))); #else { char *to = start_pos+(fill_space+n); char *from = format_ptr; while (n-- > 0) { *--to = *--from; } } #endif format_ptr += fill_space; for (i = 0; i < fill_space; i++) { *start_pos++ = padi->pad; } } } while (lfill_space--) { *format_ptr++ = pad_max[-1].pad; } } static int format_print_str (Int sno, Int size, Int has_size, Term args, int (* f_putc)(int, int)) { Term arghd; while (!has_size || size > 0) { if (IsVarTerm(args)) { Yap_Error(INSTANTIATION_ERROR, args, "format/2"); return FALSE; } else if (args == TermNil) { return TRUE; } else if (!IsPairTerm (args)) { Yap_Error(TYPE_ERROR_LIST, args, "format/2"); return FALSE; } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { Yap_Error(INSTANTIATION_ERROR, arghd, "format/2"); return FALSE; } else if (!IsIntTerm (arghd)) { Yap_Error(TYPE_ERROR_LIST, arghd, "format/2"); return FALSE; } f_putc(sno, (int) IntOfTerm (arghd)); size--; } return TRUE; } typedef enum { fst_ok, fst_error, fst_too_long } format_cp_res; static format_cp_res copy_format_string(Term inp, char *out, int max) { int i = 0; while (inp != TermNil) { Term hd; int ch; if (IsVarTerm(inp)) { Yap_Error(INSTANTIATION_ERROR,inp,"format/2"); return fst_error; } if (!IsPairTerm(inp)) { Yap_Error(TYPE_ERROR_LIST,inp,"format/2"); return fst_error; } hd = HeadOfTerm(inp); if (IsVarTerm(hd)) { Yap_Error(INSTANTIATION_ERROR,hd,"format/2"); return fst_error; } if (!IsIntTerm(hd)) { Yap_Error(TYPE_ERROR_INTEGER,hd,"format/2"); return fst_error; } ch = IntOfTerm(hd); if (ch < 0) { Yap_Error(DOMAIN_ERROR_NOT_LESS_THAN_ZERO,hd,"format/2"); return fst_error; } if (i+1 == max) { return fst_too_long; } /* we've got a character */ out[i++] = ch; /* done */ inp = TailOfTerm(inp); } out[i] = '\0'; return fst_ok; } #define FORMAT_COPY_ARGS_ERROR -1 #define FORMAT_COPY_ARGS_OVERFLOW -2 static Int format_copy_args(Term args, Term *targs, Int tsz) { Int n = 0; while (args != TermNil) { if (IsVarTerm(args)) { Yap_Error(INSTANTIATION_ERROR,args,"format/2"); return FORMAT_COPY_ARGS_ERROR; } if (!IsPairTerm(args)) { Yap_Error(TYPE_ERROR_LIST,args,"format/2"); return FORMAT_COPY_ARGS_ERROR; } if (n == tsz) return FORMAT_COPY_ARGS_OVERFLOW; targs[n] = HeadOfTerm(args); args = TailOfTerm(args); n++; } return n; } static void format_clean_up(char *format_base, char *fstr, Term *targs) { if (format_base) Yap_FreeAtomSpace(format_base); if (fstr) Yap_FreeAtomSpace(fstr); if (targs) Yap_FreeAtomSpace((char *)targs); } static Int fetch_index_from_args(Term t) { Int i; if (IsVarTerm(t)) return -1; if (!IsIntegerTerm(t)) return -1; i = IntegerOfTerm(t); if (i < 0) return -1; return i; } static int format_has_tabs(const char *seq) { int ch; while ((ch = *seq++)) { if (ch == '~') { ch = *seq++; if (ch == '*') { ch = *seq++; } if (ch == 't' || ch == '|') { return TRUE; } } } return FALSE; } static Int format(volatile Term otail, volatile Term oargs, int sno) { char tmp1[256], tmp2[256]; int ch; int column_boundary; Term mytargs[8], *targs; Int tnum, targ; char *fstr = NULL, *fptr; Term args; Term tail; int (* f_putc)(int, int); int has_tabs; jmp_buf format_botch; volatile void *old_handler; volatile int old_pos; if (Stream[sno].status & InMemory_Stream_f) { old_handler = Stream[sno].u.mem_string.error_handler; Stream[sno].u.mem_string.error_handler = (void *)&format_botch; old_pos = Stream[sno].u.mem_string.pos; /* set up an error handler */ if (setjmp(format_botch)) { *H++ = oargs; *H++ = otail; if (!Yap_growheap(FALSE, Yap_Error_Size, NULL)) { Yap_Error(OUT_OF_HEAP_ERROR,otail,"format/2"); return FALSE; } oargs = H[-2]; otail = H[-1]; Stream[sno].u.mem_string.pos = old_pos; H -= 2; } } else { old_handler = NULL; } args = oargs; tail = otail; targ = 0; column_boundary = 0; if (IsVarTerm(tail)) { Yap_Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if (IsPairTerm (tail)) { int sz = 256; do { format_cp_res fr; fstr = fptr = Yap_AllocAtomSpace(sz*sizeof(char)); if ((fr = copy_format_string(tail, fstr, sz)) == fst_ok) break; if (fr == fst_error) return FALSE; sz += 256; Yap_FreeCodeSpace(fstr); } while (TRUE); } else if (IsAtomTerm(tail)) { fstr = fptr = RepAtom(AtomOfTerm(tail))->StrOfAE; } else { Yap_Error(CONSISTENCY_ERROR, tail, "format/2"); return FALSE; } if (IsPairTerm(args)) { Int tsz = 8; targs = mytargs; do { tnum = format_copy_args(args, targs, tsz); if (tnum == FORMAT_COPY_ARGS_ERROR) return FALSE; else if (tnum == FORMAT_COPY_ARGS_OVERFLOW) { if (mytargs != targs) { Yap_FreeCodeSpace((char *)targs); } tsz += 16; targs = (Term *)Yap_AllocAtomSpace(tsz*sizeof(Term)); } else { break; } } while (TRUE); } else if (args != TermNil) { tnum = 1; mytargs[0] = args; targs = mytargs; } else { tnum = 0; targs = mytargs; } format_error = FALSE; if ((has_tabs = format_has_tabs(fptr))) { format_base = format_ptr = Yap_AllocAtomSpace(FORMAT_MAX_SIZE*sizeof(char)); format_max = format_base+FORMAT_MAX_SIZE; if (format_ptr == NULL) { Yap_Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } format_buf_size = FORMAT_MAX_SIZE; f_putc = format_putc; } else { f_putc = Stream[sno].stream_putc; format_base = NULL; } while ((ch = *fptr++)) { Term t = TermNil; int has_repeats = FALSE; int repeats = 0; if (ch == '~') { /* start command */ ch = *fptr++; if (ch == '*') { ch = *fptr++; has_repeats = TRUE; if (targ > tnum-1) { goto do_consistency_error; } repeats = fetch_index_from_args(targs[targ++]); if (repeats == -1) goto do_consistency_error; } else if (ch == '`') { /* next character is kept as code */ has_repeats = TRUE; repeats = *fptr++; ch = *fptr++; } else if (ch >= '0' && ch <= '9') { has_repeats = TRUE; repeats = 0; while (ch >= '0' && ch <= '9') { repeats = repeats*10+(ch-'0'); ch = *fptr++; } } switch (ch) { case 'a': /* print an atom */ if (has_repeats || targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (IsVarTerm(t)) goto do_instantiation_error; if (!IsAtomTerm(t)) goto do_type_atom_error; Yap_plwrite (t, f_putc, Handle_vars_f|To_heap_f); break; case 'c': { Int nch, i; if (targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (IsVarTerm(t)) goto do_instantiation_error; if (!IsIntegerTerm(t)) goto do_type_int_error; nch = IntegerOfTerm(t); if (nch < 0) goto do_domain_not_less_zero_error; if (!has_repeats) repeats = 1; for (i = 0; i < repeats; i++) f_putc(sno, nch); break; } case 'e': case 'E': case 'f': case 'g': case 'G': { Float fl; char *ptr; if (targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (IsVarTerm(t)) goto do_instantiation_error; if (!IsNumTerm(t)) goto do_type_number_error; if (IsIntegerTerm(t)) { fl = (Float)IntegerOfTerm(t); #ifdef USE_GMP } else if (IsBigIntTerm(t)) { fl = mpz_get_d(Yap_BigIntOfTerm(t)); #endif } else { fl = FloatOfTerm(t); } if (!has_repeats) repeats = 6; tmp1[0] = '%'; tmp1[1] = '.'; ptr = tmp1+2; sprintf(ptr,"%d",repeats); while (*ptr) ptr++; ptr[0] = ch; ptr[1] = '\0'; sprintf (tmp2, tmp1, fl); ptr = tmp2; while ((ch = *ptr++) != 0) f_putc(sno, ch); break; case 'd': case 'D': /* print a decimal, using weird . stuff */ if (targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (IsVarTerm(t)) goto do_instantiation_error; if (!IsIntegerTerm(t)) goto do_type_int_error; if (!has_repeats) { Yap_plwrite (t, f_putc, Handle_vars_f|To_heap_f); } else { Int siz, dec = IntegerOfTerm(t), i, div = 1; /* * The guys at Quintus have probably * read too much Cobol! */ if (dec < 0) { dec = -dec; f_putc(sno, (int) '-'); } i = dec; siz = 0; while (i > 0) { siz++; i /= 10; div *= 10; } if (repeats > siz) { f_putc(sno, (int) '.'); while (repeats > siz) { f_putc(sno, (int) '0'); repeats--; } } else { int output_done = FALSE; while (siz > repeats) { div /= 10; if (ch == 'D'&& (siz - repeats) % 3 == 0 && output_done) f_putc(sno, (int)','); f_putc(sno, (int)((dec/div)+'0')); output_done = TRUE; siz--; dec = dec%div; } f_putc(sno, (int) '.'); } Yap_plwrite (MkIntegerTerm(dec), f_putc, Handle_vars_f|To_heap_f); break; case 'r': case 'R': { Int numb, radix, div = 1; /* print a decimal, using weird . stuff */ if (targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (IsVarTerm(t)) goto do_instantiation_error; if (!IsIntegerTerm(t)) goto do_type_int_error; if (!has_repeats) radix = 8; else radix = repeats; if (radix > 36 || radix < 2) goto do_domain_error_radix; numb = IntegerOfTerm(t); if (numb < 0) { numb = -numb; f_putc(sno, (int) '-'); } i = numb; while (i > 0) { i /= radix; div *= radix; } div /= radix; while (numb) { Int dig = numb/div; if (dig < 10) f_putc(sno, (int)(dig+'0')); else if (ch == 'r') f_putc(sno, (int)((dig-10)+'a')); else f_putc(sno, (int)((dig-10)+'A')); numb %= div; div /= radix; } break; } case 's': if (targ > tnum-1) goto do_consistency_error; t = targs[targ++]; if (!format_print_str (sno, repeats, has_repeats, t, f_putc)) { goto do_default_error; } break; case 'i': if (targ > tnum-1 || has_repeats) goto do_consistency_error; targ++; break; case 'k': if (targ > tnum-1 || has_repeats) goto do_consistency_error; t = targs[targ++]; Yap_StartSlots(); Yap_plwrite (t, f_putc, Quote_illegal_f|Ignore_ops_f|To_heap_f ); ASP++; break; case 'p': if (targ > tnum-1 || has_repeats) goto do_consistency_error; t = targs[targ++]; Yap_StartSlots(); { long sl = Yap_InitSlot(args); Yap_plwrite(t, f_putc, Handle_vars_f|Use_portray_f|To_heap_f); args = Yap_GetFromSlot(sl); Yap_RecoverSlots(1); } if (EX != 0L) { Term ball = EX; EX = 0L; if (tnum <= 8) targs = NULL; if (IsAtomTerm(tail)) { fstr = NULL; } if (Stream[sno].status & InMemory_Stream_f) { Stream[sno].u.mem_string.error_handler = old_handler; } format_clean_up(format_base, fstr, targs); Yap_JumpToEnv(ball); } ASP++; break; case 'q': if (targ > tnum-1 || has_repeats) goto do_consistency_error; t = targs[targ++]; Yap_StartSlots(); Yap_plwrite (t, f_putc, Handle_vars_f|Quote_illegal_f|To_heap_f); ASP++; break; case 'w': if (targ > tnum-1 || has_repeats) goto do_consistency_error; t = targs[targ++]; Yap_StartSlots(); Yap_plwrite (t, f_putc, Handle_vars_f|To_heap_f); ASP++; break; case '~': if (has_repeats) goto do_consistency_error; f_putc(sno, (int) '~'); break; case 'n': if (!has_repeats) repeats = 1; while (repeats--) { f_putc(sno, (int) '\n'); } column_boundary = 0; pad_max = pad_entries; break; case 'N': if (!has_repeats) has_repeats = 1; if (Stream[sno].linepos != 0) { f_putc(sno, (int) '\n'); column_boundary = 0; pad_max = pad_entries; } if (repeats > 1) { Int i; for (i = 1; i < repeats; i++) f_putc(sno, (int) '\n'); column_boundary = 0; pad_max = pad_entries; } break; /* padding */ case '|': if (has_repeats) { fill_pads(repeats-(format_ptr-format_base)); } pad_max = pad_entries; column_boundary = repeats; break; case '+': if (has_repeats) { fill_pads((repeats+column_boundary)-(format_ptr-format_base)); } else { repeats = 8; fill_pads(8); } pad_max = pad_entries; column_boundary = repeats+column_boundary; break; case 't': if (!has_repeats) pad_max->pad = ' '; else pad_max->pad = fptr[-2]; pad_max->pos = format_ptr-format_base; pad_max++; f_putc = format_putc; break; do_instantiation_error: Yap_Error_TYPE = INSTANTIATION_ERROR; goto do_default_error; do_type_int_error: Yap_Error_TYPE = TYPE_ERROR_INTEGER; goto do_default_error; do_type_number_error: Yap_Error_TYPE = TYPE_ERROR_NUMBER; goto do_default_error; do_type_atom_error: Yap_Error_TYPE = TYPE_ERROR_ATOM; goto do_default_error; do_domain_not_less_zero_error: Yap_Error_TYPE = DOMAIN_ERROR_NOT_LESS_THAN_ZERO; goto do_default_error; do_domain_error_radix: Yap_Error_TYPE = DOMAIN_ERROR_RADIX; goto do_default_error; do_consistency_error: default: Yap_Error_TYPE = CONSISTENCY_ERROR; do_default_error: if (tnum <= 8) targs = NULL; if (IsAtomTerm(tail)) { fstr = NULL; } { Term ta[2]; ta[0] = otail; ta[1] = oargs; Yap_Error(Yap_Error_TYPE, Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("format"),2),2,ta), "format/2"); } if (Stream[sno].status & InMemory_Stream_f) { Stream[sno].u.mem_string.error_handler = old_handler; } format_clean_up(format_base, fstr, targs); Yap_Error_TYPE = YAP_NO_ERROR; return FALSE; } } /* ok, now we should have a command */ } } else { f_putc(sno, ch); } } if (has_tabs) { for (fptr = format_base; fptr < format_ptr; fptr++) { Stream[sno].stream_putc(sno, *fptr); } } if (IsAtomTerm(tail)) { fstr = NULL; } if (tnum <= 8) targs = NULL; if (Stream[sno].status & InMemory_Stream_f) { Stream[sno].u.mem_string.error_handler = old_handler; } format_clean_up(format_base, fstr, targs); return (TRUE); } static Int p_format(void) { /* 'format'(Control,Args) */ Int res; LOCK(BGL); res = format(Deref(ARG1),Deref(ARG2), Yap_c_output_stream); UNLOCK(BGL); return res; } static Int p_format2(void) { /* 'format'(Stream,Control,Args) */ int old_c_stream = Yap_c_output_stream; Int out; LOCK(BGL); /* needs to change Yap_c_output_stream for write */ Yap_c_output_stream = CheckStream (ARG1, Output_Stream_f, "format/3"); if (Yap_c_output_stream == -1) { Yap_c_output_stream = old_c_stream; UNLOCK(BGL); return(FALSE); } out = format(Deref(ARG2),Deref(ARG3),Yap_c_output_stream); Yap_c_output_stream = old_c_stream; UNLOCK(BGL); return(out); } static Int p_skip (void) { /* '$skip'(Stream,N) */ int sno = CheckStream (ARG1, Input_Stream_f, "skip/2"); Int n = IntOfTerm (Deref (ARG2)), ch; if (sno < 0) return (FALSE); if (n < 0 || n > 127) return (FALSE); while ((ch = Stream[sno].stream_getc(sno)) != n && ch != -1); return (TRUE); } static Int p_flush (void) { /* flush_output(Stream) */ int sno = CheckStream (ARG1, Output_Stream_f, "flush_output/1"); if (sno < 0) return (FALSE); yap_fflush (sno); return (TRUE); } static Int p_flush_all_streams (void) { /* $flush_all_streams */ #if BROKEN_FFLUSH_NULL int i; for (i = 0; i < MaxStreams; ++i) yap_fflush (i); #else fflush (NULL); #endif return (TRUE); } #if HAVE_SELECT /* stream_select(+Streams,+TimeOut,-Result) */ static Int p_stream_select(void) { Term t1 = Deref(ARG1), t2; fd_set readfds, writefds, exceptfds; struct timeval timeout, *ptime; #if _MSC_VER u_int fdmax=0; #else int fdmax=0; #endif Term tout = TermNil, ti, Head; if (IsVarTerm(t1)) { Yap_Error(INSTANTIATION_ERROR,t1,"stream_select/3"); return(FALSE); } if (!IsPairTerm(t1)) { Yap_Error(TYPE_ERROR_LIST,t1,"stream_select/3"); return(FALSE); } FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds); ti = t1; while (ti != TermNil) { #if _MSC_VER u_int fd; #else int fd; #endif int sno; Head = HeadOfTerm(ti); sno = CheckStream(Head, Input_Stream_f, "stream_select/3"); if (sno < 0) return(FALSE); fd = GetStreamFd(sno); FD_SET(fd, &readfds); if (fd > fdmax) fdmax = fd; ti = TailOfTerm(ti); } t2 = Deref(ARG2); if (IsVarTerm(t2)) { Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (IsAtomTerm(t2)) { if (t2 == MkAtomTerm(Yap_LookupAtom("off"))) { /* wait indefinitely */ ptime = NULL; } else { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t1,"stream_select/3"); return(FALSE); } } else { Term t21, t22; if (!IsApplTerm(t2) || FunctorOfTerm(t2) != FunctorModule) { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } t21 = ArgOfTerm(1, t2); if (IsVarTerm(t21)) { Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (!IsIntegerTerm(t21)) { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } timeout.tv_sec = IntegerOfTerm(t21); if (timeout.tv_sec < 0) { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } t22 = ArgOfTerm(2, t2); if (IsVarTerm(t22)) { Yap_Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (!IsIntegerTerm(t22)) { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } timeout.tv_usec = IntegerOfTerm(t22); if (timeout.tv_usec < 0) { Yap_Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } ptime = &timeout; } /* do the real work */ if (select(fdmax+1, &readfds, &writefds, &exceptfds, ptime) < 0) { #if HAVE_STRERROR Yap_Error(SYSTEM_ERROR, TermNil, "stream_select/3 (select: %s)", strerror(errno)); #else Yap_Error(SYSTEM_ERROR, TermNil, "stream_select/3 (select)"); #endif } while (t1 != TermNil) { int fd; int sno; Head = HeadOfTerm(t1); sno = CheckStream(Head, Input_Stream_f, "stream_select/3"); fd = GetStreamFd(sno); if (FD_ISSET(fd, &readfds)) tout = MkPairTerm(Head,tout); else tout = MkPairTerm(TermNil,tout); t1 = TailOfTerm(t1); } /* we're done, just pass the info back */ return(Yap_unify(ARG3,tout)); } #endif static Int p_write_depth (void) { /* write_depth(Old,New) */ Term t1 = Deref (ARG1); Term t2 = Deref (ARG2); if (!IsVarTerm (t1) && !IsIntTerm (t1)) return (FALSE); if (!IsVarTerm (t2) && !IsIntTerm (t2)) return (FALSE); if (IsVarTerm (t1)) { Term t = MkIntTerm (max_depth); if (!Yap_unify_constant(ARG1, t)) return (FALSE); } else max_depth = IntOfTerm (t1); if (IsVarTerm (ARG2)) { Term t = MkIntTerm (max_list); if (!Yap_unify_constant (ARG2, t)) return (FALSE); } else max_list = IntOfTerm (t2); return (TRUE); } static Int p_change_type_of_char (void) { /* change_type_of_char(+char,+type) */ Term t1 = Deref (ARG1); Term t2 = Deref (ARG2); if (!IsVarTerm (t1) && !IsIntTerm (t1)) return (FALSE); if (!IsVarTerm(t2) && !IsIntTerm(t2)) return (FALSE); Yap_chtype[IntOfTerm(t1)] = IntOfTerm(t2); return (TRUE); } static Int p_type_of_char (void) { /* type_of_char(+char,-type) */ Term t; Term t1 = Deref (ARG1); if (!IsVarTerm (t1) && !IsIntTerm (t1)) return (FALSE); t = MkIntTerm(Yap_chtype[IntOfTerm (t1)]); return (Yap_unify(t,ARG2)); } static Int p_force_char_conversion(void) { int i; /* don't actually enable it until someone tries to add a conversion */ if (CharConversionTable2 == NULL) return(TRUE); for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & Free_Stream_f)) Stream[i].stream_getc_for_read = ISOGetc; } CharConversionTable = CharConversionTable2; return(TRUE); } static Int p_disable_char_conversion(void) { int i; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & Free_Stream_f)) Stream[i].stream_getc_for_read = Stream[i].stream_getc; } CharConversionTable = NULL; return(TRUE); } static Int p_char_conversion(void) { Term t0 = Deref(ARG1), t1 = Deref(ARG2); char *s0, *s1; if (IsVarTerm(t0)) { Yap_Error(INSTANTIATION_ERROR, t0, "char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t0)) { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2"); return (FALSE); } s0 = RepAtom(AtomOfTerm(t0))->StrOfAE; if (s0[1] != '\0') { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2"); return (FALSE); } if (IsVarTerm(t1)) { Yap_Error(INSTANTIATION_ERROR, t1, "char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t1)) { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2"); return (FALSE); } s1 = RepAtom(AtomOfTerm(t1))->StrOfAE; if (s1[1] != '\0') { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2"); return (FALSE); } /* check if we do have a table for converting characters */ if (CharConversionTable2 == NULL) { int i; /* don't create a table if we don't need to */ if (s0[0] == s1[0]) return(TRUE); CharConversionTable2 = Yap_AllocCodeSpace(NUMBER_OF_CHARS*sizeof(char)); while (CharConversionTable2 == NULL) { if (!Yap_growheap(FALSE, NUMBER_OF_CHARS*sizeof(char), NULL)) { Yap_Error(OUT_OF_HEAP_ERROR, TermNil, Yap_ErrorMessage); return(FALSE); } } if (yap_flags[CHAR_CONVERSION_FLAG] != 0) { if (p_force_char_conversion() == FALSE) return(FALSE); } for (i = 0; i < NUMBER_OF_CHARS; i++) CharConversionTable2[i] = '\0'; } /* just add the new entry */ if (s0[0] == s1[0]) CharConversionTable2[(int)s0[0]] = '\0'; else CharConversionTable2[(int)s0[0]] = s1[0]; /* done */ return(TRUE); } static Int p_current_char_conversion(void) { Term t0, t1; char *s0, *s1; if (CharConversionTable == NULL) { return(FALSE); } t0 = Deref(ARG1); if (IsVarTerm(t0)) { Yap_Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t0)) { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2"); return (FALSE); } s0 = RepAtom(AtomOfTerm(t0))->StrOfAE; if (s0[1] != '\0') { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2"); return (FALSE); } t1 = Deref(ARG2); if (IsVarTerm(t1)) { char out[2]; if (CharConversionTable[(int)s0[0]] == '\0') return(FALSE); out[0] = CharConversionTable[(int)s0[0]]; out[1] = '\0'; return(Yap_unify(ARG2,MkAtomTerm(Yap_LookupAtom(out)))); } if (!IsAtomTerm(t1)) { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2"); return (FALSE); } s1 = RepAtom(AtomOfTerm(t1))->StrOfAE; if (s1[1] != '\0') { Yap_Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2"); return (FALSE); } else { return (CharConversionTable[(int)s0[0]] == '\0' && CharConversionTable[(int)s0[0]] == s1[0] ); } } static Int p_all_char_conversions(void) { Term out = TermNil; int i; if (CharConversionTable == NULL) { return(FALSE); } for (i = NUMBER_OF_CHARS; i > 0; ) { i--; if (CharConversionTable[i] != '\0') { Term t1, t2; char s[2]; s[1] = '\0'; s[0] = CharConversionTable[i]; t1 = MkAtomTerm(Yap_LookupAtom(s)); out = MkPairTerm(t1,out); s[0] = i; t2 = MkAtomTerm(Yap_LookupAtom(s)); out = MkPairTerm(t2,out); } } return(Yap_unify(ARG1,out)); } int Yap_StreamToFileNo(Term t) { int sno = CheckStream(t, (Input_Stream_f|Output_Stream_f), "StreamToFileNo"); if (Stream[sno].status & Pipe_Stream_f) { #if _MSC_VER || defined(__MINGW32__) return((int)(Stream[sno].u.pipe.hdl)); #else return(Stream[sno].u.pipe.fd); #endif #if USE_SOCKET } else if (Stream[sno].status & Socket_Stream_f) { return(Stream[sno].u.socket.fd); #endif } else if (Stream[sno].status & (Null_Stream_f|InMemory_Stream_f)) { return(-1); } else { return(YP_fileno(Stream[sno].u.file.file)); } } static Int p_stream(void) { Term in = Deref(ARG1); if (IsVarTerm(in)) return(FALSE); if (IsAtomTerm(in)) return(CheckAlias(AtomOfTerm(in)) >= 0); if (IsApplTerm(in)) return(FunctorOfTerm(in) == FunctorStream); return(FALSE); } static Int p_same_file(void) { char *f1 = RepAtom(AtomOfTerm(Deref(ARG1)))->StrOfAE; char *f2 = RepAtom(AtomOfTerm(Deref(ARG2)))->StrOfAE; if (strcmp(f1,f2) == 0) return(TRUE); #if HAVE_LSTAT { struct stat buf1, buf2; if (strcmp(f1,"user_input") == 0) { if (fstat(fileno(Stream[0].u.file.file), &buf1) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (strcmp(f1,"user_output") == 0) { if (fstat(fileno(Stream[1].u.file.file), &buf1) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (strcmp(f1,"user_error") == 0) { if (fstat(fileno(Stream[2].u.file.file), &buf1) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (stat(f1, &buf1) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } if (strcmp(f2,"user_input") == 0) { if (fstat(fileno(Stream[0].u.file.file), &buf2) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (strcmp(f2,"user_output") == 0) { if (fstat(fileno(Stream[1].u.file.file), &buf2) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (strcmp(f2,"user_error") == 0) { if (fstat(fileno(Stream[2].u.file.file), &buf2) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } } else if (stat(f2, &buf2) == -1) { /* file does not exist, but was opened? Return -1 */ return(FALSE); } return(buf1.st_ino == buf2.st_ino #ifdef __LCC__ && memcmp((const void *)&(buf1.st_dev),(const void *)&(buf2.st_dev),sizeof(buf1.st_dev)) == 0 #else && buf1.st_dev == buf2.st_dev #endif ); } #else return(FALSE); #endif } Term Yap_StringToTerm(char *s,Term *tp) { int sno = open_buf_read_stream(s, strlen(s)+1); Term t; TokEntry *tokstart; tr_fr_ptr TR_before_parse; if (sno < 0) return FALSE; TR_before_parse = TR; tokstart = Yap_tokptr = Yap_toktide = Yap_tokenizer(sno); /* cannot actually use CloseStream, because we didn't allocate the buffer */ Stream[sno].status = Free_Stream_f; if (tokstart == NIL && tokstart->Tok == Ord (eot_tok)) { if (tp) { *tp = MkAtomTerm(Yap_LookupAtom("end of file found before end of term")); } Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return FALSE; } else if (Yap_ErrorMessage) { if (tp) { *tp = MkAtomTerm(Yap_LookupAtom(Yap_ErrorMessage)); } Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return FALSE; } t = Yap_Parse(); TR = TR_before_parse; if (Yap_ErrorMessage) { if (tp) { *tp = syntax_error(tokstart); } Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return FALSE; } Yap_clean_tokenizer(tokstart, Yap_VarTable, Yap_AnonVarTable); return t; } Term Yap_TermToString(Term t, char *s, unsigned int sz, int flags) { int sno = open_buf_write_stream(s, sz); int old_output_stream = Yap_c_output_stream; if (sno < 0) return FALSE; Yap_StartSlots(); Yap_c_output_stream = sno; Yap_plwrite (t, Stream[sno].stream_putc, flags); s[Stream[sno].u.mem_string.pos] = '\0'; Stream[sno].status = Free_Stream_f; Yap_c_output_stream = old_output_stream; ++ASP; return EX; } void Yap_InitBackIO (void) { Yap_InitCPredBack ("$current_stream", 3, 1, init_cur_s, cont_cur_s, SafePredFlag|SyncPredFlag|HiddenPredFlag); } void Yap_InitIOPreds(void) { Term cm = CurrentModule; Yap_stdin = stdin; Yap_stdout = stdout; Yap_stderr = stderr; if (!Stream) Stream = (StreamDesc *)Yap_AllocCodeSpace(sizeof(StreamDesc)*MaxStreams); /* here the Input/Output predicates */ Yap_InitCPred ("$check_stream", 2, p_check_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$check_stream", 1, p_check_if_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag|HiddenPredFlag); Yap_InitCPred ("$stream_flags", 2, p_stream_flags, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$close", 1, p_close, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("flush_output", 1, p_flush, SafePredFlag|SyncPredFlag); Yap_InitCPred ("$flush_all_streams", 0, p_flush_all_streams, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$get", 2, p_get, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$get0", 2, p_get0, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$get0_line_codes", 2, p_get0_line_codes, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$get_byte", 2, p_get_byte, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$open", 4, p_open, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$file_expansion", 2, p_file_expansion, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$open_null_stream", 1, p_open_null_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$open_pipe_stream", 2, p_open_pipe_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag); CurrentModule = CHARSIO_MODULE; Yap_InitCPred ("open_mem_read_stream", 2, p_open_mem_read_stream, SyncPredFlag); Yap_InitCPred ("open_mem_write_stream", 1, p_open_mem_write_stream, SyncPredFlag); Yap_InitCPred ("peek_mem_write_stream", 3, p_peek_mem_write_stream, SyncPredFlag); CurrentModule = cm; Yap_InitCPred ("$put", 2, p_put, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$put_byte", 2, p_put_byte, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$set_read_error_handler", 1, p_set_read_error_handler, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$get_read_error_handler", 1, p_get_read_error_handler, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$read", 5, p_read, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$read", 6, p_read2, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$set_input", 1, p_set_input, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$set_output", 1, p_set_output, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$skip", 2, p_skip, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$write", 2, p_write, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$write", 3, p_write2, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("format", 2, p_format, SyncPredFlag); Yap_InitCPred ("format", 3, p_format2, SyncPredFlag); Yap_InitCPred ("$current_line_number", 2, p_cur_line_no, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$line_position", 2, p_line_position, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$character_count", 2, p_character_count, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$start_line", 1, p_startline, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$show_stream_flags", 2, p_show_stream_flags, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$show_stream_position", 2, p_show_stream_position, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$set_stream_position", 2, p_set_stream_position, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$user_file_name", 2, p_user_file_name, SafePredFlag|SyncPredFlag), Yap_InitCPred ("$file_name", 2, p_file_name, SafePredFlag|SyncPredFlag), Yap_InitCPred ("$past_eof", 1, p_past_eof, SafePredFlag|SyncPredFlag), Yap_InitCPred ("$peek", 2, p_peek, SafePredFlag|SyncPredFlag), Yap_InitCPred ("$peek_byte", 2, p_peek_byte, SafePredFlag|SyncPredFlag), Yap_InitCPred ("current_input", 1, p_current_input, SafePredFlag|SyncPredFlag); Yap_InitCPred ("current_output", 1, p_current_output, SafePredFlag|SyncPredFlag); Yap_InitCPred ("prompt", 1, p_setprompt, SafePredFlag|SyncPredFlag); Yap_InitCPred ("$is_same_tty", 2, p_is_same_tty, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("prompt", 2, p_prompt, SafePredFlag|SyncPredFlag); Yap_InitCPred ("always_prompt_user", 0, p_always_prompt_user, SafePredFlag|SyncPredFlag); Yap_InitCPred ("write_depth", 2, p_write_depth, SafePredFlag|SyncPredFlag); Yap_InitCPred ("$change_type_of_char", 2, p_change_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$type_of_char", 2, p_type_of_char, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("char_conversion", 2, p_char_conversion, SyncPredFlag); Yap_InitCPred ("$current_char_conversion", 2, p_current_char_conversion, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$all_char_conversions", 1, p_all_char_conversions, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$force_char_conversion", 0, p_force_char_conversion, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$disable_char_conversion", 0, p_disable_char_conversion, SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$add_alias_to_stream", 2, p_add_alias_to_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$change_alias_to_stream", 2, p_change_alias_to_stream, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$check_if_valid_new_alias", 1, p_check_if_valid_new_alias, TestPredFlag|SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$fetch_stream_alias", 2, p_fetch_stream_alias, SafePredFlag|SyncPredFlag|HiddenPredFlag); Yap_InitCPred ("$stream", 1, p_stream, SafePredFlag|TestPredFlag), #if HAVE_SELECT Yap_InitCPred ("stream_select", 3, p_stream_select, SafePredFlag|SyncPredFlag); #endif Yap_InitCPred ("$same_file", 2, p_same_file, SafePredFlag|SyncPredFlag|HiddenPredFlag); #if USE_SOCKET Yap_InitSockets (); #endif InitPlIO (); #if HAVE_LIBREADLINE InitReadline(); #endif }