/************************************************************************* * * * 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__) #if USE_SOCKET #include #endif #ifndef S_ISDIR #define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR) #endif #endif /* if we botched in a LongIO operation */ jmp_buf IOBotch; int in_getc = FALSE; #if HAVE_LIBREADLINE #if _MSC_VER || defined(__MINGW32__) FILE *rl_instream, *rl_outstream; #endif #endif typedef struct { union { struct { Atom name; Term user_name; YP_File file; } file; struct { char *buf; /* where the file is being read from/written to */ Int max_size; /* maximum buffer size (may be changed dynamically) */ Int pos; } mem_string; struct { #if defined(__MINGW32__) || _MSC_VER HANDLE hdl; #else int fd; #endif } pipe; #if USE_SOCKET struct { socket_domain domain; socket_info flags; int fd; } socket; #endif } u; int (* stream_putc)(int, int); /* function the stream uses for writing */ int (* stream_getc)(int); /* function the stream uses for reading */ /* function the stream uses for parser. It may be different if the ISO character conversion is on */ int (* stream_getc_for_read)(int); Int charcount, linecount, linepos; Int status; Int och; } StreamDesc; STATIC_PROTO (void InitStdStream, (int, SMALLUNSGN, YP_File, Atom)); 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 *, int)); STATIC_PROTO (int post_process_read_char, (int, StreamDesc *, int)); #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 (void checkcol, (int)); STATIC_PROTO (Int p_inform_of_clause, (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 GetArgSizeFromThirdArg, (char **, Term *)); STATIC_PROTO (Int GetArgSizeFromChars, (char **pptr, Int *, Term *)); STATIC_PROTO (void format_print_str, (Int, Int, Term)); 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 (Int GetArgSizeFromChar, (Term *)); #define YAP_ERROR NIL #define MaxStreams 32 StreamDesc Stream[MaxStreams]; #define Free_Stream_f 0x000001 #define Output_Stream_f 0x000002 #define Input_Stream_f 0x000004 #define Append_Stream_f 0x000008 #define Eof_Stream_f 0x000010 #define Null_Stream_f 0x000020 #define Tty_Stream_f 0x000040 #define Socket_Stream_f 0x000080 #define Binary_Stream_f 0x000100 #define Eof_Error_Stream_f 0x000200 #define Reset_Eof_Stream_f 0x000400 #define Past_Eof_Stream_f 0x000800 #define Push_Eof_Stream_f 0x001000 #define Seekable_Stream_f 0x002000 #define Promptable_Stream_f 0x004000 #if USE_SOCKET #define Client_Socket_Stream_f 0x008000 #define Server_Socket_Stream_f 0x010000 #endif #define InMemory_Stream_f 0x020000 #define Pipe_Stream_f 0x040000 #define Popen_Stream_f 0x080000 int YP_stdin = 0; int YP_stdout = 1; int YP_stderr = 2; int c_input_stream, c_output_stream; #if EMACS static int first_char; #endif #define FAIL_ON_PARSER_ERROR 0 #define QUIET_ON_PARSER_ERROR 1 #define CONTINUE_ON_PARSER_ERROR 2 #define EXCEPTION_ON_PARSER_ERROR 3 static int parser_error_style = FAIL_ON_PARSER_ERROR; #define StdInStream 0 #define StdOutStream 1 #define StdErrStream 2 #define ALIASES_BLOCK_SIZE 8 #if USE_SOCKET extern int YP_sockets_io; #endif /* note: fprintf may be called from anywhere, so please don't try to be smart and allocate stack from somewhere else */ int YP_fprintf(int sno, char *format,...) { va_list ap; char buf[512], *ptr = buf; int r = 0; va_start(ap,format); #ifdef HAVE_VSNPRINTF vsnprintf(buf,512,format,ap); #else vsprintf(buf,format,ap); #endif va_end(ap); while (*ptr) { Stream[sno].stream_putc(sno, *ptr++); r++; } return r; } int YP_putc(int ch, int sno) { Stream[sno].stream_putc(sno, ch); return(ch); } int YP_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 (YP_sockets_io && (YP_fileno (s->u.file.file) == 0)) { 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__) { struct _stat buf; char *emacs_env = getenv("EMACS"); if (_fstat(YP_fileno(s->u.file.file), &buf) == -1) { return; } if (buf.st_mode & S_IFCHR) { 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); } else if (emacs_env != NULL && strcmp(emacs_env,"t") == 0) { /* emacs communicates with sub-processes via a pipe */ 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); } 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 = 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)) { char *ttys = ttyname(filedes); if (ttys == NULL) s->u.file.name = LookupAtom("tty"); else s->u.file.name = LookupAtom(ttys); 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 void InitStdStream (int sno, SMALLUNSGN flags, YP_File file, Atom name) { 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 && s->u.file.name == Stream[0].u.file.name) 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; } 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) && file == stdin) /* make sure input is unbuffered if it comes from stdin, this makes life simpler for interrupt handling */ YP_setbuf (stdin, NULL); #endif /* HAVE_SETBUF */ } void InitPlIO (void) { Int i; for (i = 0; i < MaxStreams; ++i) Stream[i].status = Free_Stream_f; InitStdStream (StdInStream, Input_Stream_f, stdin, AtomUsrIn); InitStdStream (StdOutStream, Output_Stream_f, stdout, AtomUsrOut); InitStdStream (StdErrStream, Output_Stream_f, stderr, AtomUsrErr); c_input_stream = StdInStream; c_output_stream = StdOutStream; /* alloca alias array */ FileAliases = (AliasDesc)AllocCodeSpace(sizeof(struct AliasDescS)*ALIASES_BLOCK_SIZE); /* 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; } static Int PlIOError (yap_error_number type, Term culprit, char *who) { if (GetValue(LookupAtom("fileerrors")) == MkIntTerm(1)) { 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. */ int newline = TRUE; static void count_output_char(int ch, StreamDesc *s, int sno) { if (ch == '\n') { #if MPWSHELL if (mpwshell && (sno == StdOutStream || sno == StdErrStream) && !(s->status & Null_Stream_f)) { putc (MPWSEP, s->u.file.file); if (!(Stream[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, int sno) { if (ch == '\n') { #if MPWSHELL if (mpwshell && (sno == StdOutStream || sno == StdErrStream) && !(s->status & Null_Stream_f)) { putc (MPWSEP, s->u.file.file); if (!(Stream[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; } } /* 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,sno); 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 page_size; /* oops, we have reached an overflow */ Int new_max_size = s->u.mem_string.max_size + page_size; char *newbuf; if ((newbuf = AllocAtomSpace(new_max_size*sizeof(char))) == NULL) { Error(SYSTEM_ERROR, TermNil, "YAP could not grow heap for writing to string"); } #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 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,sno); 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 send(s->u.socket.fd, &c, sizeof(c), 0); #else write(s->u.socket.fd, &c, sizeof(c)); #endif count_output_char(ch,s,sno); 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 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,sno); 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,sno); 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,sno); 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,sno); return ((int) ch); } /* static */ static int ConsolePutc (int sno, int ch) { StreamDesc *s = &Stream[sno]; #if MAC || _MSC_VER if (ch == 10) { ch = '\n'; } #endif putc (ch, s->u.file.file); console_count_output_char(ch,s,sno); 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_prompt (void) { /* prompt(Old,New) */ Term t = Deref (ARG2); Atom a; if (!unify_constant (ARG1, MkAtomTerm (*AtPrompt))) return (FALSE); if (IsVarTerm (t) || !IsAtomTerm (t)) return (FALSE); a = AtomOfTerm (t); if (strlen (RepAtom (a)->StrOfAE) > MAX_PROMPT) { 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 #include extern void add_history (const char *); static char *ttyptr = NULL; char *_line = (char *) NULL; static int cur_out_sno = 2; #define READLINE_OUT_BUF_MAX 256 static void InitReadline(void) { ReadlineBuf = (char *)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,sno); return((int) '\n'); } } *ReadlinePos++ = ch; console_count_output_char(ch,Stream+sno,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) { in_getc = TRUE; /* Only sends a newline if we are at the start of a line */ if (_line != NULL && _line != (char *) EOF) free (_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[2].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,StdErrStream); } _line = readline (Prompt); } else { _line = readline (NULL); } } else { if (ReadlinePos != ReadlineBuf) { ReadlinePos[0] = '\0'; ReadlinePos = ReadlineBuf; _line = readline (ReadlineBuf); } else { _line = readline (NULL); } } /* Do it the gnu way */ if (PrologMode & InterruptMode) { PrologMode &= ~InterruptMode; ProcessSIGINT(); if (PrologMode & AbortMode) { Error(PURE_ABORT, TermNil, NULL); ErrorMessage = "Abort"; return(console_post_process_read_char(EOF, s, sno)); } continue; } newline=FALSE; strncpy (Prompt, RepAtom (*AtPrompt)->StrOfAE, MAX_PROMPT); in_getc = FALSE; /* window of vulnerability closed */ if (_line == NULL || _line == (char *) EOF) return(console_post_process_read_char(EOF, s, sno)); if (_line[0] != '\0' && _line[1] != '\0') add_history (_line); ttyptr = _line; } if (*ttyptr == '\0') { ttyptr = NIL; ch = '\n'; } else { ch = *ttyptr++; } return(console_post_process_read_char(ch, s, sno)); } #endif /* 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) { 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 && s->u.file.name == Stream[0].u.file.name) 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, int sno) { if (ch == '\n') { ++s->linecount; ++s->charcount; s->linepos = 0; /* don't convert if the stream is binary */ if (!(Stream[sno].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, int sno) { 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 count = recv(s->u.socket.fd, &c, sizeof(char), 0); #else count = read(s->u.socket.fd, &c, sizeof(char)); #endif if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(post_process_read_char(ch, s, sno)); } /* 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 */ #if _MSC_VER count = recv(s->u.socket.fd, &c, sizeof(char), 0); #else count = read(s->u.socket.fd, &c, sizeof(char)); #endif if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(console_post_process_read_char(ch, s, sno)); } #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, "read from 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 { Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(post_process_read_char(ch, s, sno)); } /* 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) { PlIOError (SYSTEM_ERROR,TermNil, "read from pipe returned error"); return(EOF); } #else /* should be able to use a buffer */ count = read(s->u.pipe.fd, &c, sizeof(char)); #endif if (count == 0) { ch = EOF; } else if (count > 0) { ch = c; } else { Error(SYSTEM_ERROR, TermNil, "read"); return(EOF); } return(console_post_process_read_char(ch, s, sno)); } /* 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, sno)); } /* 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, sno)); } /* 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 in_getc = TRUE; ch = YP_fgetc(s->u.file.file); in_getc = FALSE; #if HAVE_SIGINTERRUPT siginterrupt(SIGINT, FALSE); #endif if (PrologMode & InterruptMode) { PrologMode &= ~InterruptMode; ProcessSIGINT(); newline = TRUE; if (PrologMode & AbortMode) { Error(PURE_ABORT, TermNil, NULL); ErrorMessage = "Abort"; return(console_post_process_read_char(EOF, s, sno)); } goto restart; } return(console_post_process_read_char(ch, s, sno)); } /* 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 && s->u.file.name == Stream[0].u.file.name) s->stream_putc = ReadlinePutc; } else #endif { s->stream_getc = ConsoleGetc; } } else { s->stream_getc = PlGetc; } return(post_process_read_char(ch, s, sno)); } #if EMACS int GetCurInpPos () { if (Stream[c_input_stream].status & (Tty_Stream_f|Socket_Stream_f|InMemory_Stream_f)) return (Stream[c_input_stream].charcount); else return (YP_ftell (Stream[c_input_stream].u.file.file)); } #endif /* EMACS */ /* used by user-code to read characters from the current input stream */ int PlGetchar (void) { return(Stream[c_input_stream].stream_getc(c_input_stream)); } /* avoid using a variable to call a function */ int PlFGetchar (void) { return(PlGetc(c_input_stream)); } static Term MkStream (int n) { Term t[1]; t[0] = MkIntTerm (n); return (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 (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) != '.' && !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 */ 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)); } /* given a socket file descriptor, get the corresponding stream descripor */ int CheckIOStream(Term stream, char * error) { return(CheckStream(stream, Input_Stream_f|Output_Stream_f|Socket_Stream_f, error)); } #if USE_SOCKET Term InitSocketStream(int fd, socket_info flags, socket_domain domain) { StreamDesc *st; int sno; for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) { 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 CheckSocketStream(Term stream, char * error) { return(CheckStream(stream, Socket_Stream_f, error)); } /* given a stream index, get the corresponding domain */ socket_domain GetSocketDomain(int sno) { return(Stream[sno].u.socket.domain); } /* given a stream index, get the corresponding status */ socket_info GetSocketStatus(int sno) { return(Stream[sno].u.socket.flags); } /* update info on a socket, eg, new->server or new->client */ void 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)) { Error(DOMAIN_ERROR_SOURCE_SINK,file_name, "open/3"); return(FALSE); } t2 = Deref (ARG2); if (!IsAtomTerm (t2)) { 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(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 { Error(DOMAIN_ERROR_IO_MODE, t2, "open/3"); return(FALSE); } if (!TrueFileName (RepAtom (AtomOfTerm (file_name))->StrOfAE, FileNameBuf, FALSE)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK,file_name,"open/3")); for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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 (FileNameBuf, io_mode)) == YAP_ERROR || (!(opts & 2 /* binary */) && binary_file(FileNameBuf))) { if (open_mode == AtomCsult) { if (!find_csult_file (FileNameBuf, FileNameBuf2, st, io_mode)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK, file_name, "open/3")); strncpy (FileNameBuf, 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) { SetTextFile (RepAtom (AtomOfTerm (file_name))->StrOfAE); } #endif st->status = s; st->charcount = 0; st->linecount = 1; st->u.file.name = LookupAtom (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 = MkApplTerm(MkFunctor(LookupAtom("reposition"),1),1,ta); 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 (unify (ARG3, t)); } static Int p_file_expansion (void) { /* '$file_expansion'(+File,-Name) */ Term file_name = Deref(ARG1); /* we know file_name is bound */ if (!IsAtomTerm (file_name)) { PlIOError(TYPE_ERROR_ATOM, file_name, "absolute_file_name/3"); return(FALSE); } if (!TrueFileName (RepAtom (AtomOfTerm (file_name))->StrOfAE, FileNameBuf, FALSE)) return (PlIOError (EXISTENCE_ERROR_SOURCE_SINK,file_name,"absolute_file_name/3")); return(unify(ARG2,MkAtomTerm(LookupAtom(FileNameBuf)))); } static Int p_add_alias_to_stream (void) { Term tname = Deref(ARG1); Term tstream = Deref(ARG2); Atom at; Int sno; if (IsVarTerm(tname)) { Error(INSTANTIATION_ERROR, tname, "$add_alias_to_stream"); return (FALSE); } else if (!IsAtomTerm (tname)) { Error(TYPE_ERROR_ATOM, tname, "$add_alias_to_stream"); return (FALSE); } if (IsVarTerm(tstream)) { Error(INSTANTIATION_ERROR, tstream, "$add_alias_to_stream"); return (FALSE); } else if (!IsApplTerm (tstream) || FunctorOfTerm (tstream) != FunctorStream || !IsIntTerm(ArgOfTerm(1,tstream))) { Error(DOMAIN_ERROR_STREAM_OR_ALIAS, tstream, "$add_alias_to_stream"); return (FALSE); } at = AtomOfTerm(tname); sno = (int)IntOfTerm(ArgOfTerm(1,tstream)); if (AddAlias(at, sno)) return(TRUE); /* we could not create the alias, time to close the stream */ CloseStream(sno); Error(PERMISSION_ERROR_NEW_ALIAS_FOR_STREAM, tname, "open/3"); return (FALSE); } static Int p_change_alias_to_stream (void) { Term tname = Deref(ARG1); Term tstream = Deref(ARG2); Atom at; Int sno; if (IsVarTerm(tname)) { Error(INSTANTIATION_ERROR, tname, "$change_alias_to_stream/2"); return (FALSE); } else if (!IsAtomTerm (tname)) { Error(TYPE_ERROR_ATOM, tname, "$change_alias_to_stream/2"); return (FALSE); } at = AtomOfTerm(tname); if ((sno = CheckStream (tstream, Input_Stream_f | Output_Stream_f | Append_Stream_f | Socket_Stream_f, "change_stream_alias/2")) == -1) return(FALSE); SetAlias(at, sno); return(TRUE); } static Int p_check_if_valid_new_alias (void) { Term tname = Deref(ARG1); Atom at; if (IsVarTerm(tname)) { Error(INSTANTIATION_ERROR, tname, "$add_alias_to_stream"); return (FALSE); } else if (!IsAtomTerm (tname)) { 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(unify_constant(t2, MkAtomTerm(at))); } else if (IsAtomTerm(t2)) { Atom at = AtomOfTerm(t2); return((Int)FindAliasForStream(sno,at)); } else { Error(TYPE_ERROR_ATOM, t2, "fetch_stream_alias/2"); return(FALSE); } } static Int p_open_null_stream (void) { Term t; StreamDesc *st; int sno; for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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 = LookupAtom ("/dev/null")); t = MkStream (sno); return (unify (ARG1, t)); } Term OpenStream(FILE *fd, char *name, Term file_name, int flags) { Term t; StreamDesc *st; int sno; for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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 = 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 for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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 t1 = MkStream (sno); for (; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) return (PlIOError (SYSTEM_ERROR,TermNil, "new stream not available for open_pipe_stream/2")); 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 (unify (ARG1, t1) && unify (ARG2, t2)); } static Int p_open_mem_read_stream (void) /* $open_mem_read_stream(+List,-Stream) */ { Term t, ti; StreamDesc *st; int sno; Int sl = 0, nchars = 0; char *nbuf; ti = Deref(ARG1); while (ti != TermNil) { if (IsVarTerm(ti)) { Error(INSTANTIATION_ERROR, ti, "open_mem_read_stream"); return (FALSE); } else if (!IsPairTerm(ti)) { Error(TYPE_ERROR_LIST, ti, "open_mem_read_stream"); return (FALSE); } else { sl++; ti = TailOfTerm(ti); } } while ((nbuf = (char *)AllocAtomSpace((sl+1)*sizeof(char))) == NULL) { if (!growheap(FALSE)) { Error(SYSTEM_ERROR, TermNil, "YAP could not grow heap in open_mem_read_stream"); return(FALSE); } } ti = Deref(ARG1); while (ti != TermNil) { Term ts = HeadOfTerm(ti); if (IsVarTerm(ts)) { Error(INSTANTIATION_ERROR, ARG1, "open_mem_read_stream"); return (FALSE); } else if (!IsIntTerm(ts)) { Error(TYPE_ERROR_INTEGER, ARG1, "open_mem_read_stream"); return (FALSE); } nbuf[nchars++] = IntOfTerm(ts); ti = TailOfTerm(ti); } nbuf[nchars] = '\0'; for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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; t = MkStream (sno); return (unify (ARG2, t)); } static Int p_open_mem_write_stream (void) /* $open_mem_write_stream(-Stream) */ { Term t; StreamDesc *st; int sno; char *nbuf; extern int page_size; while ((nbuf = (char *)AllocAtomSpace(page_size*sizeof(char))) == NULL) { if (!growheap(FALSE)) { Error(SYSTEM_ERROR, TermNil, "YAP could not grow heap in open_mem_write_stream"); return(FALSE); } } for (sno = 0; sno < MaxStreams; ++sno) if (Stream[sno].status & Free_Stream_f) break; if (sno == MaxStreams) 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 = 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 = page_size; t = MkStream (sno); return (unify (ARG1, t)); } static void ExtendAliasArray(void) { AliasDesc new; UInt new_size = SzOfFileAliases+ALIASES_BLOCK_SIZE; new = (AliasDesc)AllocCodeSpace(sizeof(AliasDesc *)*new_size); memcpy((void *)new, (void *)FileAliases, sizeof(AliasDesc *)*SzOfFileAliases); 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; switch(alno) { case 0: YP_stdin = sno; break; case 1: YP_stdout = sno; break; case 2: YP_stderr = sno; #if HAVE_SETBUF if (!(Stream[sno].status & (Null_Stream_f|InMemory_Stream_f|Socket_Stream_f))) YP_setbuf (Stream[sno].u.file.file, NULL); #endif /* HAVE_SETBUF */ break; default: break; } 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: YP_stdin = 0; break; case 1: YP_stdout = 1; break; case 2: YP_stderr = 2; 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)) { 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)) { 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) { 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) { Error(DOMAIN_ERROR_STREAM_OR_ALIAS, arg, msg); return (-1); } if (Stream[sno].status & Free_Stream_f) { Error(EXISTENCE_ERROR_STREAM, arg, msg); return (-1); } if ((Stream[sno].status & kind) == 0) { if (kind & Input_Stream_f) Error(PERMISSION_ERROR_INPUT_STREAM, arg, msg); else 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 USE_SOCKET if (Stream[i].status & Socket_Stream_f) return(MkAtomTerm(LookupAtom("socket"))); else #endif if (Stream[i].status & Pipe_Stream_f) return(MkAtomTerm(LookupAtom("pipe"))); if (Stream[i].status & InMemory_Stream_f) return(MkAtomTerm(LookupAtom("charsio"))); 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"); t1 = StreamName(i); t2 = (Stream[i].status & Input_Stream_f ? MkAtomTerm (AtomRead) : MkAtomTerm (AtomWrite)); if (unify(ARG1,t1) && 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 (unify (ARG3, t3) && unify_constant (ARG1, t1) && 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 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)) { CloseSocket(Stream[sno].u.socket.fd, Stream[sno].u.socket.flags, Stream[sno].u.socket.domain); } #endif else if (!(Stream[sno].status & (Null_Stream_f|Socket_Stream_f|InMemory_Stream_f))) YP_fclose (Stream[sno].u.file.file); else { if (loud) YP_fprintf (YP_stderr, "[ Error: while closing stream: %s ]\n", RepAtom (Stream[sno].u.file.name)->StrOfAE); } if (c_input_stream == sno) { c_input_stream = StdInStream; } else if (c_output_stream == sno) { c_output_stream = StdOutStream; } } Stream[sno].status = Free_Stream_f; } 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)) { 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)) { FreeAtomSpace(Stream[sno].u.mem_string.buf); } Stream[sno].status = Free_Stream_f; PurgeAlias(sno); if (c_input_stream == sno) { c_input_stream = StdInStream; } else if (c_output_stream == sno) { c_output_stream = StdOutStream; } /* if (st->status == Socket_Stream_f|Input_Stream_f|Output_Stream_f) { CloseSocket(); } */ } 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) { /* '$peek_mem_write_stream'(+Stream,?S0,?S) */ Int sno = CheckStream (ARG1, (Output_Stream_f | InMemory_Stream_f), "close/2"); Int i = Stream[sno].u.mem_string.pos; Term tf = ARG2; CELL *HI; if (sno < 0) return (FALSE); restart: HI = H; while (i > 0) { --i; tf = MkPairTerm(MkIntTerm(Stream[sno].u.mem_string.buf[i]),tf); while (H + 1024 >= ASP) { H = HI; if (!gc(3, ENV, P)) { Error(SYSTEM_ERROR, TermNil, "YAP could not grow stack in peek_mem_write_stream/2"); return(FALSE); } i = 0; tf = ARG2; goto restart; } } return (unify(ARG3,tf)); } static Int p_past_eof (void) { /* at_end_of_stream */ /* the next character is a EOF */ int sno = CheckStream (ARG1, Input_Stream_f, "past_eof/1"); if (sno < 0) return (FALSE); return(Stream[sno].status & Eof_Stream_f); } static Int p_peek (void) { /* at_end_of_stream */ /* the next character is a EOF */ int sno = CheckStream (ARG1, Input_Stream_f, "peek/2"); StreamDesc *s; Int ocharcount, olinecount, olinepos; Int status; Int ch; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "peek/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "peek/2"); return(FALSE); } } s = Stream+sno; ocharcount = s->charcount; olinecount = s->linecount; olinepos = s->linepos; ch = Stream[sno].stream_getc(sno); s->charcount = ocharcount; s->linecount = olinecount; s->linepos = olinepos; /* buffer the character */ s->och = ch; /* mark a special function to recover this character */ s->stream_getc = PlUnGetc; if (CharConversionTable != NULL) s->stream_getc_for_read = ISOGetc; else s->stream_getc_for_read = s->stream_getc; return(unify_constant(ARG2,MkIntTerm(ch))); } static Int p_set_input (void) { /* '$set_input'(+Stream,-ErrorMessage) */ Int sno = CheckStream (ARG1, Input_Stream_f, "set_input/1"); if (sno < 0) return (FALSE); c_input_stream = sno; return (TRUE); } static Int p_set_output (void) { /* '$set_output'(+Stream,-ErrorMessage) */ Int sno = CheckStream (ARG1, Output_Stream_f, "set_output/1"); if (sno < 0) return (FALSE); c_output_stream = sno; return (TRUE); } static Int p_current_input (void) { /* current_input(?Stream) */ Term t1 = Deref(ARG1); if (IsVarTerm(t1)) { Term t = MkStream (c_input_stream); BIND(VarOfTerm(t1), t, bind_in_current_input); #ifdef COROUTINING DO_TRAIL(CellPtr(t1), t); if (CellPtr(t1) < H0) WakeUp(VarOfTerm(t1)); bind_in_current_input: #endif return(TRUE); } else if (!IsApplTerm(t1) || FunctorOfTerm(t1) != FunctorStream || !IsIntTerm((t1=ArgOfTerm(1,t1)))) { Error(DOMAIN_ERROR_STREAM,t1,"current_input/1"); return(FALSE); } else { return(c_input_stream == IntOfTerm(t1)); } } static Int p_current_output (void) { /* current_output(?Stream) */ Term t1 = Deref(ARG1); if (IsVarTerm(t1)) { Term t = MkStream (c_output_stream); BIND((CELL *)t1, t, bind_in_current_output); #ifdef COROUTINING DO_TRAIL(CellPtr(t1), t); if (CellPtr(t1) < H0) WakeUp(VarOfTerm(t1)); bind_in_current_output: #endif return(TRUE); } else if (!IsApplTerm(t1) || FunctorOfTerm(t1) != FunctorStream || !IsIntTerm((t1=ArgOfTerm(1,t1)))) { Error(DOMAIN_ERROR_STREAM,t1,"current_output/1"); return(FALSE); } else { return(c_output_stream == IntOfTerm(t1)); } } static Int p_write (void) { /* '$write'(+Flags,?Term) */ plwrite (ARG2, Stream[c_output_stream].stream_putc, (int) IntOfTerm (Deref (ARG1))); return (TRUE); } static Int p_write2 (void) { /* '$write'(+Stream,+Flags,?Term) */ int old_output_stream = c_output_stream; c_output_stream = CheckStream (ARG1, Output_Stream_f, "write/2"); if (c_output_stream == -1) { c_output_stream = old_output_stream; return(FALSE); } plwrite (ARG3, Stream[c_output_stream].stream_putc, (int) IntOfTerm (Deref (ARG2))); c_output_stream = old_output_stream; return (TRUE); } static int error_col; static void checkcol (int l) { if (error_col + l > 70) YP_putc ('\n', YP_stderr), error_col = 0; error_col += l; } void syntax_error (TokEntry * tokptr) { Term info; char *s; while (1) { if (tokptr == toktide) { YP_fprintf (YP_stderr, "\n<==== HERE ====>\n"); error_col = 0; } info = tokptr->TokInfo; switch (tokptr->Tok) { case Name_tok: s = RepAtom (((Atom) info))->StrOfAE; checkcol (strlen (s) + 1); YP_fprintf (YP_stderr, " %s", s); break; case Number_tok: checkcol (6); #if SHORT_INTS YP_fprintf (YP_stderr, " %ld", IntOfTerm (info)); #else YP_fprintf (YP_stderr, " %d", IntOfTerm (info)); #endif break; case Var_tok: s = ((VarEntry *) info)->VarRep; checkcol (strlen (s) + 1); YP_fprintf (YP_stderr, " %s", s); break; case String_tok: s = (char *) info; checkcol (strlen (s) + 2); YP_fprintf (YP_stderr, "\"%s\"", s); break; case Ponctuation_tok: if (Ord (info) == 'l') { checkcol (1); YP_putc ('(', YP_stderr); } else { checkcol (2); YP_fprintf (YP_stderr, " %c", (int) info); } } if (tokptr->Tok == Ord (eot_tok)) break; tokptr = tokptr->TokNext; } YP_putc ('.', YP_stderr); YP_putc ('\n', YP_stderr); } void FirstLineInParse (void) { StartLine = Stream[c_input_stream].linecount; StartCh = Stream[c_input_stream].charcount; } static Int p_startline (void) { return (unify_constant (ARG1, MkIntTerm (StartLine))); } static Int p_inform_of_clause (void) { /* '$inform_of_clause'(Func,Mode) */ #if EMACS unsigned int arity; int clause_no; Atom at; Prop pred_prop; if (emacs_mode) { Term t1 = Deref (ARG1); Term t2 = Deref (ARG2); if (IsVarTerm (t1)) return (FALSE); else if (IsAtomTerm (t1)) { arity = 0; at = AtomOfTerm (t1); } else if (IsApplTerm (t1)) { Functor func = FunctorOfTerm (t1); arity = ArityOfFunctor (func); at = NameOfFunctor (func); } else return (FALSE); if (IsVarTerm (t2) || !IsIntTerm (t2)) return (FALSE); YP_fprintf (YP_stdout, "\001(yap-consult-clause \"%s\" %d %d %d)\002\n", RepAtom (at)->StrOfAE, arity, where_new_clause (PredProp (at, arity), (int) (IntOfTerm (t2) % 4)), first_char); } #endif return (TRUE); } /* control the parser error handler */ static Int p_set_read_error_handler(void) { Term t = Deref(ARG1); char *s; if (IsVarTerm(t)) { Error(INSTANTIATION_ERROR,t,"set_read_error_handler"); return(FALSE); } if (!IsAtomTerm(t)) { Error(TYPE_ERROR_ATOM,t,"bad syntax_error handler"); return(FALSE); } s = RepAtom(AtomOfTerm(t))->StrOfAE; if (!strcmp(s, "fail")) { parser_error_style = FAIL_ON_PARSER_ERROR; } else if (!strcmp(s, "error")) { parser_error_style = EXCEPTION_ON_PARSER_ERROR; } else if (!strcmp(s, "quiet")) { parser_error_style = QUIET_ON_PARSER_ERROR; } else if (!strcmp(s, "dec10")) { parser_error_style = CONTINUE_ON_PARSER_ERROR; } else { 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 (parser_error_style) { case FAIL_ON_PARSER_ERROR: t = MkAtomTerm(LookupAtom("fail")); break; case EXCEPTION_ON_PARSER_ERROR: t = MkAtomTerm(LookupAtom("error")); break; case QUIET_ON_PARSER_ERROR: t = MkAtomTerm(LookupAtom("quiet")); break; case CONTINUE_ON_PARSER_ERROR: t = MkAtomTerm(LookupAtom("dec10")); break; default: Error(SYSTEM_ERROR,TermNil,"corrupted syntax_error handler"); return(FALSE); } return (unify_constant (ARG1, t)); } static Int p_read (void) { /* '$read'(+Flag,?Term,?Vars) */ Term t, v; TokEntry *tokstart, *fast_tokenizer (void); #if EMACS int emacs_cares = FALSE; #endif tr_fr_ptr old_TR; if (Stream[c_input_stream].status & Binary_Stream_f) { Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, MkAtomTerm(Stream[c_input_stream].u.file.name), "read_term/2"); return(FALSE); } else if (Stream[c_input_stream].status & Eof_Error_Stream_f) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, MkAtomTerm(Stream[c_input_stream].u.file.name), "read_term/2"); return(FALSE); } old_TR = TR; while (TRUE) { CELL *old_H = H; /* Scans the term using stack space */ eot_before_eof = FALSE; if ((Stream[c_input_stream].status & (Promptable_Stream_f|Pipe_Stream_f|Socket_Stream_f|Eof_Stream_f|InMemory_Stream_f)) || CharConversionTable != NULL || Stream[c_input_stream].stream_getc != PlGetc) tokstart = tokptr = toktide = tokenizer (Stream[c_input_stream].stream_getc_for_read, Stream[c_input_stream].stream_getc); else { tokstart = tokptr = toktide = fast_tokenizer (); } if ((Stream[c_input_stream].status & Eof_Stream_f) && !eot_before_eof) { if (tokstart != NIL && tokstart->Tok != Ord (eot_tok)) { /* we got the end of file from an abort */ if (ErrorMessage == "Abort") { TR = old_TR; return(FALSE); } /* we need to force the next reading to also give end of file.*/ Stream[c_input_stream].status |= Push_Eof_Stream_f; ErrorMessage = "[ Error: end of file found before end of term ]"; } else { /* restore TR */ TR = old_TR; return (unify_constant (ARG2, MkAtomTerm (AtomEof))); } } repeat_cycle: if (ErrorMessage || (t = Parse ()) == 0) { if (ErrorMessage && (strcmp(ErrorMessage,"Stack Overflow") == 0)) { /* ignore term we just built */ H = old_H; if (growstack_in_parser(&old_TR, &tokstart, &VarTable)) { tokptr = toktide = tokstart; ErrorMessage = NULL; goto repeat_cycle; } } TR = old_TR; if (parser_error_style == QUIET_ON_PARSER_ERROR) { return(FALSE); } if (c_input_stream != StdInStream) { #if MPW if (mpwshell) { YP_fprintf (YP_stderr, "File \"%s\" ;", RepAtom (Stream[c_input_stream].u.file.name)->StrOfAE); YP_fprintf (YP_stderr, " line %d # syntax error \n", StartLine); } else { YP_fprintf (YP_stderr, "<==== syntax error "); YP_fprintf (YP_stderr, " line %d ====>\n", StartLine); } #else #if EMACS if (emacs_mode) { YP_fprintf (YP_stdout, "\001(yap-error \"%s\" %d \"yap syntax error\")\002\n", RepAtom (Stream[c_input_stream].u.file.name)->StrOfAE, toktide->TokPos); emacs_cares = TRUE; } else { YP_fprintf (YP_stderr, "[ Syntax Error: "); YP_fprintf (YP_stderr, "line %d ]\n", StartLine); } #else YP_fprintf (YP_stderr, "[ Syntax Error at line %d: ", StartLine); #endif /* EMACS */ #endif /* MPW */ } else { YP_fprintf (YP_stderr, "[ Syntax error: "); } #if EMACS if (emacs_cares) { char tmp[256], *s = tmp; long i = 0, fd_char; YP_File fd; snoozing = TRUE; YP_fclose (Stream[c_input_stream].u.file.file); sleep (3600); /* snooze until a nasty * interrupt wakes Yap for * breakfast */ if ((fd = YP_fopen (emacs_tmp, "r")) == NULL) YP_fprintf (YP_stderr, "Unable to communicate with Emacs: could not open %s\n", emacs_tmp); while ((fd_char = YP_getc (fd)) != ' ' && fd_char != EOF) i = i * 10 + fd_char - '0'; Stream[c_input_stream].u.file.file = YP_fopen (RepAtom (Stream[c_input_stream].u.file.name)->StrOfAE, "r"); if (YP_fseek (Stream[c_input_stream].u.file.file, i, 0) < 0) YP_fprintf (YP_stderr, "Problems while working with Emacs\n"); else { /* * YP_fprintf(YP_stderr,"gone to %d with * %d\n",YP_ftell(Stream[c_input_stream]. * file),i); */ Stream[c_input_stream].linepos = 0; Stream[c_input_stream].linecount = 1; Stream[c_input_stream].charcount = 0; } YP_fclose (fd); unlink (emacs_tmp); } else { if (ErrorMessage) YP_fprintf (YP_stderr, "%s\n", ErrorMessage); else syntax_error (tokstart); } #else if (ErrorMessage) YP_fprintf (YP_stderr, "%s", ErrorMessage); else syntax_error (tokstart); YP_fprintf (YP_stderr, " ]\n"); #endif /* EMACS */ if (parser_error_style == FAIL_ON_PARSER_ERROR) { return (FALSE); } else if (parser_error_style == EXCEPTION_ON_PARSER_ERROR) { Error(SYSTEM_ERROR,TermNil,NULL); return(FALSE); } } 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(IOBotch) == 0) { v = VarNames(VarTable, TermNil); TR = old_TR; break; } else { /* don't need to recheck tokens */ tokstart = NULL; /* restart global */ H = old_H; growstack_in_parser(&old_TR, &tokstart, &VarTable); old_H = H; } } return(unify(t, ARG2) && unify (v, ARG3)); } else { TR = old_TR; return(unify(t, ARG2)); } } static Int p_read2 (void) { /* '$read2'(+Flag,?Term,?Vars,+Stream) */ int old_c_stream = c_input_stream; Int out; /* needs to change c_output_stream for write */ c_input_stream = CheckStream (ARG4, Input_Stream_f, "read/3"); if (c_input_stream == -1) { c_input_stream = old_c_stream; return(FALSE); } out = p_read(); c_input_stream = old_c_stream; return(out); } 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(LookupAtom("socket")); else #endif if (Stream[sno].status & Pipe_Stream_f) tout = MkAtomTerm(LookupAtom("pipe")); else if (Stream[sno].status & InMemory_Stream_f) tout = MkAtomTerm(LookupAtom("charsio")); else tout = Stream[sno].u.file.user_name; return (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(LookupAtom("socket")); else #endif if (Stream[sno].status & Pipe_Stream_f) tout = MkAtomTerm(LookupAtom("pipe")); else if (Stream[sno].status & InMemory_Stream_f) tout = MkAtomTerm(LookupAtom("charsio")); else tout = MkAtomTerm(Stream[sno].u.file.name); return (unify_constant (ARG2, tout)); } static Int p_cur_line_no (void) { /* '$current_line_number'(+Stream,-N) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f,"current_line_number/2"); if (sno < 0) return (FALSE); /* one has to be somewhat more careful because of terminals */ if (Stream[sno].status & Tty_Stream_f) { Int no = 1; int i; Atom my_stream; #if USE_SOCKET if (Stream[sno].status & Socket_Stream_f) my_stream = LookupAtom("socket"); else #endif if (Stream[sno].status & Pipe_Stream_f) my_stream = LookupAtom("pipe"); else if (Stream[sno].status & InMemory_Stream_f) my_stream = LookupAtom("charsio"); else my_stream = Stream[sno].u.file.name; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & (Free_Stream_f|Socket_Stream_f|Pipe_Stream_f|InMemory_Stream_f)) && Stream[i].u.file.name == my_stream) no += Stream[i].linecount - 1; } tout = MkIntTerm (no); } else tout = MkIntTerm (Stream[sno].linecount); return (unify_constant (ARG2, tout)); } static Int p_line_position (void) { /* '$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 (unify_constant (ARG2, tout)); } static Int p_character_count (void) { /* '$character_count'(+Stream,-N) */ Term tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "character_count/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & Tty_Stream_f) { Int no = 0; int i; Atom my_stream = Stream[sno].u.file.name; for (i = 0; i < MaxStreams; i++) { if (!(Stream[i].status & Free_Stream_f) && Stream[i].u.file.name == my_stream) no += Stream[i].charcount; } tout = MkIntTerm (no); } else if (Stream[sno].status & Null_Stream_f) tout = MkIntTerm (Stream[sno].charcount); else tout = MkIntTerm (YP_ftell (Stream[sno].u.file.file)); return (unify_constant (ARG2, tout)); } static Int p_show_stream_flags(void) { /* '$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 (unify (ARG2, tout)); } static Int p_show_stream_position (void) { /* '$show_stream_position'(+Stream,Pos) */ Term sargs[3], tout; int sno = CheckStream (ARG1, Input_Stream_f | Output_Stream_f | Append_Stream_f, "stream_position/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & (Tty_Stream_f|Socket_Stream_f|Pipe_Stream_f|InMemory_Stream_f)) sargs[0] = MkIntTerm (Stream[sno].charcount); else if (Stream[sno].status & Null_Stream_f) sargs[0] = MkIntTerm (Stream[sno].charcount); else sargs[0] = MkIntTerm (YP_ftell (Stream[sno].u.file.file)); sargs[1] = MkIntTerm (Stream[sno].linecount); sargs[2] = MkIntTerm (Stream[sno].linepos); tout = MkApplTerm (FunctorStreamPos, 3, sargs); return (unify (ARG2, tout)); } static Int p_set_stream_position (void) { /* '$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)) { Error(INSTANTIATION_ERROR, tin, "set_stream_position/2"); return (FALSE); } else if (!(IsApplTerm (tin))) { Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (FunctorOfTerm (tin) == FunctorStreamPos) { if (IsVarTerm (tp = ArgOfTerm (1, tin))) { Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (!(Stream[sno].status & Seekable_Stream_f) ) { Error(PERMISSION_ERROR_REPOSITION_STREAM, ARG1,"set_stream_position/2"); return(FALSE); } char_pos = IntOfTerm (tp); if (IsVarTerm (tp = ArgOfTerm (2, tin))) { Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { 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))) { Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (!IsIntTerm (tp)) { 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) { Error(SYSTEM_ERROR, tp, "fseek failed for set_stream_position/2"); return(FALSE); } } else if (FunctorOfTerm (tin) == FunctorStreamEOS) { if (IsVarTerm (tp = ArgOfTerm (1, tin))) { Error(INSTANTIATION_ERROR, tp, "set_stream_position/2"); return (FALSE); } else if (tp != MkAtomTerm(LookupAtom("at"))) { Error(DOMAIN_ERROR_STREAM_POSITION, tin, "set_stream_position/2"); return (FALSE); } if (!(Stream[sno].status & Seekable_Stream_f) ) { Error(PERMISSION_ERROR_REPOSITION_STREAM, ARG1,"set_stream_position/2"); return(FALSE); } if (YP_fseek (Stream[sno].u.file.file, 0L, SEEK_END) == -1) { 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) { /* '$get'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get/2"); Int ch; Int status; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get/2"); return(FALSE); } else if (status & Eof_Error_Stream_f) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get/2"); return(FALSE); } } while ((ch = Stream[sno].stream_getc(sno)) <= 32 && ch >= 0); return (unify_constant (ARG2, MkIntTerm (ch))); } static Int p_get0 (void) { /* '$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) { Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get0/2"); return(FALSE); } } out = Stream[sno].stream_getc(sno); return (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) { /* '$get0'(Stream,-N) */ int sno = CheckStream (ARG1, Input_Stream_f, "get0/2"); Int status; Term out; if (sno < 0) return(FALSE); status = Stream[sno].status; if (status & (Binary_Stream_f|Eof_Stream_f)) { if (status & Binary_Stream_f) { Error(PERMISSION_ERROR_INPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } else if (status & (Eof_Error_Stream_f)) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get0/2"); return(FALSE); } } out = read_line(sno); return(unify(out,ARG2)); } static Int p_get_byte (void) { /* '$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)) { 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)) { Error(PERMISSION_ERROR_INPUT_PAST_END_OF_STREAM, ARG1, "get_byte/2"); return(FALSE); } return (unify_constant (ARG2, MkIntTerm (Stream[sno].stream_getc(sno)))); } static Int p_put (void) { /* '$put'(Stream,N) */ int sno = CheckStream (ARG1, Output_Stream_f, "put/2"); if (sno < 0) return (FALSE); if (Stream[sno].status & Binary_Stream_f) { Error(PERMISSION_ERROR_OUTPUT_BINARY_STREAM, ARG1, "get0/2"); return(FALSE); } Stream[sno].stream_putc (sno, (int) IntOfTerm (Deref (ARG2))); /* * if (!(Stream[sno].status & Null_Stream_f)) * YP_fflush(Stream[sno].u.file.file); */ return (TRUE); } static Int p_put_byte (void) { /* '$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)) { 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)) * YP_fflush(Stream[sno].u.file.file); */ return (TRUE); } static int format_error = FALSE; static Int GetArgSizeFromThirdArg (char **pptr, Term * termptr) { Term args = *termptr, arghd; char *ptr = *pptr; Int res; if (IsVarTerm(args)) { format_error = TRUE; Error(INSTANTIATION_ERROR, args, "format/2"); return(0); } else if (!IsPairTerm (args)) { format_error = TRUE; Error(TYPE_ERROR_LIST, args, "format/2"); return(0); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return(0); } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return(0); } res = IntOfTerm (arghd); if (res < 0) { format_error = TRUE; Error(DOMAIN_ERROR_NOT_LESS_THAN_ZERO, arghd, "format/2"); return (0); } #if SHORT_INTS sprintf (ptr, "%ld", res); #else sprintf (ptr, "%d", res); #endif while (*ptr) ptr++; *pptr = ptr; *termptr = args; return (res); } static Int GetArgSizeFromChar (Term * args) { Term arghd, argtl = *args; Int val; if (IsVarTerm(argtl)) { format_error = TRUE; Error(INSTANTIATION_ERROR, argtl, "format/2"); return(0); } else if (!IsPairTerm (argtl)) { format_error = TRUE; Error(TYPE_ERROR_LIST, argtl, "format/2"); return(0); } arghd = HeadOfTerm (argtl); argtl = TailOfTerm (argtl); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return(0); } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return(0); } val = IntOfTerm (arghd); if (IsVarTerm(argtl)) { format_error = TRUE; Error(INSTANTIATION_ERROR, argtl, "format/2"); return(0); } else if (!IsPairTerm (argtl)) { format_error = TRUE; Error(TYPE_ERROR_LIST, argtl, "format/2"); return(0); } arghd = HeadOfTerm (argtl); argtl = TailOfTerm (argtl); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return(0); } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return(0); } if (IntOfTerm (arghd) != 't') { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return (0); } *args = argtl; return (val); } static Int GetArgSizeFromChars (char **pptr, Int * intptr, Term * termptr) { Term args = *termptr, arghd; char *ptr = *pptr; Int up_to_now = *intptr; int ch; if (IsVarTerm(args)) { format_error = TRUE; Error(INSTANTIATION_ERROR, args, "format/2"); return(0); } else if (!IsPairTerm (args)) { format_error = TRUE; Error(TYPE_ERROR_LIST, args, "format/2"); return(0); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return(0); } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return(0); } ch = IntOfTerm (arghd); while (ch >= '0' && ch <= '9') { *ptr++ = ch; up_to_now = up_to_now * 10 + ch - '0'; if (IsVarTerm(args)) { format_error = TRUE; Error(INSTANTIATION_ERROR, args, "format/2"); return(0); } else if (!IsPairTerm (args)) { format_error = TRUE; Error(TYPE_ERROR_LIST, args, "format/2"); return(0); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return(0); } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return(0); } ch = (int) IntOfTerm (arghd); } *intptr = up_to_now; *termptr = args; *pptr = ptr; return (ch); } #define FORMAT_MAX_SIZE 256 static char *format_ptr, *format_base; 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 (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_base == format_buf_size) { /* oops, we have reached an overflow */ Int new_max_size = format_buf_size + FORMAT_MAX_SIZE; char *newbuf; if ((newbuf = AllocAtomSpace(new_max_size*sizeof(char))) == NULL) { 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 FreeAtomSpace(format_base); format_ptr = newbuf+(format_ptr-format_base); format_base = newbuf; format_buf_size = new_max_size; } 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 void format_print_str (Int sno, Int size, Term args) { Term arghd; Int always_flag = !size; while (always_flag || size > 0) { if (IsVarTerm(args)) { format_error = TRUE; Error(INSTANTIATION_ERROR, args, "format/2"); return; } else if (args == TermNil) break; else if (!IsPairTerm (args)) { format_error = TRUE; Error(TYPE_ERROR_LIST, args, "format/2"); return; } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { format_error = TRUE; Error(INSTANTIATION_ERROR, arghd, "format/2"); return; } else if (!IsIntTerm (arghd)) { format_error = TRUE; Error(TYPE_ERROR_LIST, arghd, "format/2"); return; } format_putc(sno, (int) IntOfTerm (arghd)); size--; } } static Int format(Term tail, Term args, int sno) { char tmp1[256], tmp2[256], *ptr; Term head, arghd; int ch; Int int2, i; int column_boundary = 0; Int size_args, arg_size; Float float_tmp; if (IsVarTerm(tail)) { Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if (!IsPairTerm (tail)) { Error(TYPE_ERROR_LIST,tail,"format/2"); return(FALSE); } head = HeadOfTerm (tail); tail = TailOfTerm (tail); if (IsVarTerm (args) || !IsPairTerm (args)) args = MkPairTerm (args, TermNil); format_base = format_ptr = AllocAtomSpace(FORMAT_MAX_SIZE*sizeof(char)); if (format_ptr == NULL) { Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } format_buf_size = FORMAT_MAX_SIZE; format_error = FALSE; while (!IsVarTerm (head) && IsIntTerm (head)) { ch = IntOfTerm (head); if (ch == '~') { size_args = FALSE; arg_size = 0; ptr = tmp1; *ptr++ = '%'; if (IsVarTerm (tail = Deref (tail)) ) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if (!IsPairTerm (tail)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,tail,"format/2"); return(FALSE); } head = HeadOfTerm (tail); tail = TailOfTerm (tail); if (IsVarTerm (head)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if ( !IsIntTerm (head)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,tail,"format/2"); return(FALSE); } else ch = IntOfTerm (head); if (ch == '*') { size_args = TRUE; arg_size = GetArgSizeFromThirdArg (&ptr, &args); if (format_error) { FreeAtomSpace(format_base); return(FALSE); } if (IsVarTerm (tail = Deref (tail)) ) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if (!IsPairTerm (tail)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,tail,"format/2"); return(FALSE); } head = HeadOfTerm (tail); tail = TailOfTerm (tail); if (IsVarTerm (head)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if ( !IsIntTerm (head)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,tail,"format/2"); return(FALSE); } else ch = IntOfTerm (head); } else if (ch >= '0' && ch <= '9') { arg_size = ch - '0'; size_args = TRUE; ch = GetArgSizeFromChars (&ptr, &arg_size, &tail); if (format_error) { FreeAtomSpace(format_base); return (FALSE); } } else if (ch == '`') { size_args = TRUE; arg_size = GetArgSizeFromChar(&tail); if (format_error) { FreeAtomSpace(format_base); return(FALSE); } ch = 't'; } switch (ch) { case 'a': if (size_args) { FreeAtomSpace(format_base); return (FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~a format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~a format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~a in format/2"); return(FALSE); } else if (!IsAtomTerm (arghd)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_ATOM,arghd,"~a in format/2"); return(FALSE); } plwrite (arghd, format_putc, 4); break; case 'c': if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~c in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~c in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~c in format/2"); return(FALSE); } else if (!IsIntTerm (arghd)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_ATOM,arghd,"~a in format/2"); return(FALSE); } else int2= IntOfTerm(arghd); if (!size_args) arg_size = 1; for (i = 0; i < arg_size; i++) format_putc(sno, int2); break; case 'e': case 'E': case 'f': case 'g': case 'G': if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~%d in format/2", ch); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~%d in format/2", ch); return(FALSE); } if (arg_size == 0 || arg_size > 6) arg_size = 6; *ptr++ = '.'; *ptr++ = '0' + arg_size; *ptr++ = ch; *ptr = 0; arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm(arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~%c in format/2", ch); return(FALSE); } else if (!IsNumTerm (arghd)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_FLOAT,arghd,"~%c in format/2", ch); return(FALSE); } if (IsIntegerTerm(arghd)) { float_tmp = IntegerOfTerm(arghd); #ifdef USE_GMP } else if (IsBigIntTerm(arghd)) { float_tmp = mpz_get_d(BigIntOfTerm(arghd)); #endif } else { float_tmp = FloatOfTerm (arghd); } sprintf (tmp2, tmp1, float_tmp); ptr = tmp2; while ((ch = *ptr++) != 0) format_putc(sno, ch); break; case 'd': if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~d format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~d format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~d in format/2"); return(FALSE); } else if (IsIntTerm (arghd)) { int2 = IntOfTerm (arghd); } else if (IsLongIntTerm (arghd)) { int2 = LongIntOfTerm(arghd); } else { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,arghd,"~d in format/2"); return(FALSE); } if (!arg_size) plwrite (arghd, format_putc, 4); else { Int siz; /* * The guys at Quintus have probably * read too much Cobol! */ if (int2 < 0) { int2 = -int2; format_putc(sno, (int) '-'); } #if SHORT_INTS sprintf (tmp2, "%ld", int2); #else sprintf (tmp2, "%d", int2); #endif siz = strlen (tmp2); { char *ptr = tmp2; if (siz <= arg_size) format_putc(sno, (int) '0'); else while (siz > arg_size) format_putc(sno, (int) *ptr++), --siz; format_putc(sno, (int) '.'); while (siz < arg_size) format_putc(sno, (int) '0'), --arg_size; while (*ptr) format_putc(sno, (int) (*ptr++)); } } break; case 'D': if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~D in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~D in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~D in format/2"); return(FALSE); } else if (IsIntTerm (arghd)) { int2 = IntOfTerm (arghd); } else if (IsLongIntTerm (arghd)) { int2 = LongIntOfTerm(arghd); } else { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,arghd,"~D in format/2"); return(FALSE); } { Int siz, lsiz; char *ptr = tmp2; if (int2 < 0) { int2 = -int2; format_putc(sno, (int) '-'); } /* * The guys at Quintus have probably * read too much Cobol! */ #if SHORT_INTS sprintf (tmp2, "%ld", int2); #else sprintf (tmp2, "%d", int2); #endif siz = strlen (tmp2); if ((lsiz = siz - arg_size) <= 0) format_putc(sno, (int) '0'); else { Int imod = lsiz % 3; int output_done = FALSE; for (i = 0; i < lsiz; i++) { if (imod-- == 0) { if (output_done) format_putc(sno, (int) ','); imod = 2; } format_putc(sno, (int) (*ptr++)); output_done = TRUE; } } if (arg_size > 0) format_putc(sno, (int) '.'); while (lsiz < 0) format_putc(sno, (int) '0'), ++lsiz; while (*ptr) format_putc(sno, (int) (*ptr++)); } break; case 'r': { Int radix = 8; ptr = tmp2; if (size_args) radix = arg_size; if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~r in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~r in format/2"); return(FALSE); } if (radix > 36 || radix < 2) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_RADIX,MkIntTerm(radix),"~r in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~r in format/2"); return(FALSE); } else if (IsIntTerm (arghd)) { int2 = IntOfTerm (arghd); } else if (IsLongIntTerm (arghd)) { int2 = LongIntOfTerm(arghd); } else { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,arghd,"~r in format/2"); return(FALSE); } if (int2 < 0) { int2 *= -1; format_putc(sno, (int) '-'); } else if (int2 == 0) format_putc(sno, (int) '0'); while (int2 != 0) { Int numb = int2 % radix; if (numb >= 10) numb += 'a' - 10; else numb += '0'; *ptr++ = numb; int2 = int2 / radix; } while (--ptr >= tmp2) format_putc(sno, (int) *ptr); } break; case 'R': { Int radix = 8; ptr = tmp2; if (size_args) radix = arg_size; if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~R in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~R in format/2"); return(FALSE); } if (radix > 36 || radix < 2) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_RADIX,MkIntTerm(radix),"~R in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~R in format/2"); return(FALSE); } else if (IsIntTerm (arghd)) { int2 = IntOfTerm (arghd); } else if (IsLongIntTerm (arghd)) { int2 = LongIntOfTerm(arghd); } else { FreeAtomSpace(format_base); Error(TYPE_ERROR_INTEGER,arghd,"~R in format/2"); return(FALSE); } if (int2 < 0) { int2 *= -1; format_putc(sno, (int) '-'); } else if (int2 == 0) format_putc(sno, (int) '0'); while (int2 != 0) { Int numb = int2 % radix; if (numb >= 10) numb += 'A' - 10; else numb += '0'; *ptr++ = numb; int2 = int2 / radix; } while (--ptr >= tmp2) format_putc(sno, (int) *ptr); } break; case 's': if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~s in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~s in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); if (IsVarTerm (arghd)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,arghd,"~s in format/2"); return(FALSE); } else if (!IsPairTerm (arghd) && arghd != TermNil) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,arghd,"~s in format/2"); return(FALSE); } format_print_str (sno, arg_size, arghd); if (format_error) { FreeAtomSpace(format_base); return(FALSE); } break; case 'i': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "~i in format/2"); return(FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~i in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~i in format/2"); return(FALSE); } args = TailOfTerm (args); break; case 'k': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "~k in format/2"); return(FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~k in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~k in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); plwrite (arghd, format_putc, (int) 3); break; case 'p': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "~p in format/2"); return(FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~p in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~p in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); plwrite (arghd, format_putc, (int) 12); break; case 'q': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "~q in format/2"); return(FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~q in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~q in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); plwrite (arghd, format_putc, (int) 5); break; case 'w': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "bad arguments for ~w in format/2"); return(FALSE); } if (IsVarTerm (args)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,args,"~w in format/2"); return(FALSE); } else if (!IsPairTerm (args)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,args,"~w in format/2"); return(FALSE); } arghd = HeadOfTerm (args); args = TailOfTerm (args); plwrite (arghd, format_putc, (int) 4); break; case '~': if (size_args) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_ZERO,MkIntTerm(size_args), "~~ in format/2"); return(FALSE); } format_putc(sno, (int) '~'); break; case 'n': if (!size_args) arg_size = 1; for (i = 0; i < arg_size; i++) format_putc(sno, (int) '\n'); column_boundary = 0; pad_max = pad_entries; break; case 'N': if (!size_args) { arg_size = 1; } if (Stream[sno].linepos != 0) { format_putc(sno, (int) '\n'); column_boundary = 0; pad_max = pad_entries; } if (arg_size > 1) { for (i = 1; i < arg_size; i++) format_putc(sno, (int) '\n'); column_boundary = 0; pad_max = pad_entries; } break; /* padding */ case '|': if (size_args) { fill_pads(arg_size-(format_ptr-format_base)); } pad_max = pad_entries; column_boundary = arg_size; break; case '+': if (size_args) { fill_pads((arg_size+column_boundary)-(format_ptr-format_base)); } else { fill_pads(8); } pad_max = pad_entries; column_boundary = arg_size+column_boundary; break; case 't': if (!size_args) arg_size = ' '; pad_max->pad = arg_size; pad_max->pos = format_ptr-format_base; pad_max++; break; default: FreeAtomSpace(format_base); return (FALSE); } } else if (ch == '\\') { if (HeadOfTerm (tail) == MkIntTerm ('c')) { tail = TailOfTerm (tail); if (IsVarTerm (tail)) { FreeAtomSpace(format_base); Error(INSTANTIATION_ERROR,tail,"format/2"); return(FALSE); } else if (!IsPairTerm (tail)) { FreeAtomSpace(format_base); Error(TYPE_ERROR_LIST,tail,"format/2"); return(FALSE); } head = HeadOfTerm (tail); tail = TailOfTerm (tail); if (head != MkIntTerm (10)) { FreeAtomSpace(format_base); Error(DOMAIN_ERROR_NOT_NL,head, "format/2"); return(FALSE); } } else format_putc(sno, (int) '\\'); } else format_putc(sno, ch); if (IsVarTerm (tail) || !IsPairTerm (tail)) { for (ptr = format_base; ptr < format_ptr; ptr++) { Stream[sno].stream_putc(sno, *ptr); } FreeAtomSpace(format_base); return(TRUE); } head = HeadOfTerm (tail); tail = TailOfTerm (tail); } for (ptr = format_base; ptr < format_ptr; ptr++) { Stream[sno].stream_putc(sno, *ptr); } FreeAtomSpace(format_base); return (TRUE); } static Int p_format(void) { /* '$format'(Control,Args) */ return(format(Deref(ARG1),Deref(ARG2), c_output_stream)); } static Int p_format2(void) { /* '$format'(Stream,Control,Args) */ int old_c_stream = c_output_stream; Int out; /* needs to change c_output_stream for write */ c_output_stream = CheckStream (ARG1, Output_Stream_f, "format/3"); if (c_output_stream == -1) { c_output_stream = old_c_stream; return(FALSE); } out = format(Deref(ARG2),Deref(ARG3),c_output_stream); c_output_stream = old_c_stream; 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); YP_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) YP_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)) { Error(INSTANTIATION_ERROR,t1,"stream_select/3"); return(FALSE); } if (!IsPairTerm(t1)) { 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)) { Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (IsAtomTerm(t2)) { if (t2 == MkAtomTerm(LookupAtom("off"))) { /* wait indefinitely */ ptime = NULL; } else { Error(DOMAIN_ERROR_TIMEOUT_SPEC,t1,"stream_select/3"); return(FALSE); } } else { Term t21, t22; if (!IsApplTerm(t2) || FunctorOfTerm(t2) != FunctorModule) { Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } t21 = ArgOfTerm(1, t2); if (IsVarTerm(t21)) { Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (!IsIntegerTerm(t21)) { Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } timeout.tv_sec = IntegerOfTerm(t21); if (timeout.tv_sec < 0) { Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } t22 = ArgOfTerm(2, t2); if (IsVarTerm(t22)) { Error(INSTANTIATION_ERROR,t2,"stream_select/3"); return(FALSE); } if (!IsIntegerTerm(t22)) { Error(DOMAIN_ERROR_TIMEOUT_SPEC,t2,"stream_select/3"); return(FALSE); } timeout.tv_usec = IntegerOfTerm(t22); if (timeout.tv_usec < 0) { 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 Error(SYSTEM_ERROR, TermNil, "stream_select/3 (select: %s)", strerror(errno)); #else 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(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 (!unify_constant(ARG1, t)) return (FALSE); } else *max_depth = IntOfTerm (t1); if (IsVarTerm (ARG2)) { Term t = MkIntTerm (*max_list); if (!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); 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(chtype[IntOfTerm (t1)]); return (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)) { Error(INSTANTIATION_ERROR, t0, "char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t0)) { Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2"); return (FALSE); } s0 = RepAtom(AtomOfTerm(t0))->StrOfAE; if (s0[1] != '\0') { Error(REPRESENTATION_ERROR_CHARACTER, t0, "char_conversion/2"); return (FALSE); } if (IsVarTerm(t1)) { Error(INSTANTIATION_ERROR, t1, "char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t1)) { Error(REPRESENTATION_ERROR_CHARACTER, t1, "char_conversion/2"); return (FALSE); } s1 = RepAtom(AtomOfTerm(t1))->StrOfAE; if (s1[1] != '\0') { 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 = AllocCodeSpace(NUMBER_OF_CHARS*sizeof(char)); while (CharConversionTable2 == NULL) { if (!growheap(FALSE)) { Error(SYSTEM_ERROR, TermNil, "YAP could not grow heap in char_conversion/2"); 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)) { Error(INSTANTIATION_ERROR, t0, "current_char_conversion/2"); return (FALSE); } if (!IsAtomTerm(t0)) { Error(REPRESENTATION_ERROR_CHARACTER, t0, "current_char_conversion/2"); return (FALSE); } s0 = RepAtom(AtomOfTerm(t0))->StrOfAE; if (s0[1] != '\0') { 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(unify(ARG2,MkAtomTerm(LookupAtom(out)))); } if (!IsAtomTerm(t1)) { Error(REPRESENTATION_ERROR_CHARACTER, t1, "current_char_conversion/2"); return (FALSE); } s1 = RepAtom(AtomOfTerm(t1))->StrOfAE; if (s1[1] != '\0') { 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(LookupAtom(s)); out = MkPairTerm(t1,out); s[0] = i; t2 = MkAtomTerm(LookupAtom(s)); out = MkPairTerm(t2,out); } } return(unify(ARG1,out)); } int 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 } else if (Stream[sno].status & Socket_Stream_f) { return(Stream[sno].u.socket.fd); } 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); } void InitBackIO (void) { InitCPredBack ("$current_stream", 3, 1, init_cur_s, cont_cur_s, SafePredFlag|SyncPredFlag); } void InitIOPreds(void) { /* here the Input/Output predicates */ InitCPred ("$check_stream", 2, p_check_stream, SafePredFlag|SyncPredFlag); InitCPred ("$check_stream", 1, p_check_if_stream, SafePredFlag|SyncPredFlag); InitCPred ("$stream_flags", 2, p_stream_flags, SafePredFlag|SyncPredFlag); InitCPred ("$close", 1, p_close, SafePredFlag|SyncPredFlag); InitCPred ("peek_mem_write_stream", 3, p_peek_mem_write_stream, SyncPredFlag); InitCPred ("flush_output", 1, p_flush, SafePredFlag|SyncPredFlag); InitCPred ("$flush_all_streams", 0, p_flush_all_streams, SafePredFlag|SyncPredFlag); InitCPred ("$get", 2, p_get, SafePredFlag|SyncPredFlag); InitCPred ("$get0", 2, p_get0, SafePredFlag|SyncPredFlag); InitCPred ("$get0_line_codes", 2, p_get0_line_codes, SafePredFlag|SyncPredFlag); InitCPred ("$get_byte", 2, p_get_byte, SafePredFlag|SyncPredFlag); InitCPred ("$open", 4, p_open, SafePredFlag|SyncPredFlag); InitCPred ("$file_expansion", 2, p_file_expansion, SafePredFlag|SyncPredFlag); InitCPred ("$open_null_stream", 1, p_open_null_stream, SafePredFlag|SyncPredFlag); InitCPred ("$open_pipe_stream", 2, p_open_pipe_stream, SafePredFlag|SyncPredFlag); InitCPred ("open_mem_read_stream", 2, p_open_mem_read_stream, SyncPredFlag); InitCPred ("open_mem_write_stream", 1, p_open_mem_write_stream, SyncPredFlag); InitCPred ("$put", 2, p_put, SafePredFlag|SyncPredFlag); InitCPred ("$put_byte", 2, p_put_byte, SafePredFlag|SyncPredFlag); InitCPred ("$set_read_error_handler", 1, p_set_read_error_handler, SafePredFlag|SyncPredFlag); InitCPred ("$get_read_error_handler", 1, p_get_read_error_handler, SafePredFlag|SyncPredFlag); InitCPred ("$read", 3, p_read, SafePredFlag|SyncPredFlag); InitCPred ("$read", 4, p_read2, SafePredFlag|SyncPredFlag); InitCPred ("$set_input", 1, p_set_input, SafePredFlag|SyncPredFlag); InitCPred ("$set_output", 1, p_set_output, SafePredFlag|SyncPredFlag); InitCPred ("$skip", 2, p_skip, SafePredFlag|SyncPredFlag); InitCPred ("$write", 2, p_write, SyncPredFlag); InitCPred ("$write", 3, p_write2, SyncPredFlag); InitCPred ("$format", 2, p_format, SyncPredFlag); InitCPred ("$format", 3, p_format2, SyncPredFlag); InitCPred ("$current_line_number", 2, p_cur_line_no, SafePredFlag|SyncPredFlag); InitCPred ("$line_position", 2, p_line_position, SafePredFlag|SyncPredFlag); InitCPred ("$character_count", 2, p_character_count, SafePredFlag|SyncPredFlag); InitCPred ("$start_line", 1, p_startline, SafePredFlag|SyncPredFlag); InitCPred ("$show_stream_flags", 2, p_show_stream_flags, SafePredFlag|SyncPredFlag); InitCPred ("$show_stream_position", 2, p_show_stream_position, SafePredFlag|SyncPredFlag); InitCPred ("$set_stream_position", 2, p_set_stream_position, SafePredFlag|SyncPredFlag); InitCPred ("$inform_of_clause", 2, p_inform_of_clause, SafePredFlag|SyncPredFlag); InitCPred ("$inform_of_clause", 2, p_inform_of_clause, SafePredFlag|SyncPredFlag); InitCPred ("$user_file_name", 2, p_user_file_name, SafePredFlag|SyncPredFlag), InitCPred ("$file_name", 2, p_file_name, SafePredFlag|SyncPredFlag), InitCPred ("$past_eof", 1, p_past_eof, SafePredFlag|SyncPredFlag), InitCPred ("$peek", 2, p_peek, SafePredFlag|SyncPredFlag), InitCPred ("$peek_byte", 2, p_peek, SafePredFlag|SyncPredFlag), InitCPred ("current_input", 1, p_current_input, SafePredFlag|SyncPredFlag); InitCPred ("current_output", 1, p_current_output, SafePredFlag|SyncPredFlag); InitCPred ("prompt", 1, p_setprompt, SafePredFlag|SyncPredFlag); InitCPred ("prompt", 2, p_prompt, SafePredFlag|SyncPredFlag); InitCPred ("always_prompt_user", 0, p_always_prompt_user, SafePredFlag|SyncPredFlag); InitCPred ("write_depth", 2, p_write_depth, SafePredFlag|SyncPredFlag); InitCPred ("$change_type_of_char", 2, p_change_type_of_char, SafePredFlag|SyncPredFlag); InitCPred ("$type_of_char", 2, p_type_of_char, SafePredFlag|SyncPredFlag); InitCPred ("char_conversion", 2, p_char_conversion, SyncPredFlag); InitCPred ("$current_char_conversion", 2, p_current_char_conversion, SyncPredFlag); InitCPred ("$all_char_conversions", 1, p_all_char_conversions, SyncPredFlag); InitCPred ("$force_char_conversion", 0, p_force_char_conversion, SyncPredFlag); InitCPred ("$disable_char_conversion", 0, p_disable_char_conversion, SyncPredFlag); InitCPred ("$add_alias_to_stream", 2, p_add_alias_to_stream, SafePredFlag|SyncPredFlag); InitCPred ("$change_alias_to_stream", 2, p_change_alias_to_stream, SafePredFlag|SyncPredFlag); InitCPred ("$check_if_valid_new_alias", 1, p_check_if_valid_new_alias, TestPredFlag|SafePredFlag|SyncPredFlag); InitCPred ("$fetch_stream_alias", 2, p_fetch_stream_alias, SafePredFlag|SyncPredFlag); InitCPred ("$stream", 1, p_stream, SafePredFlag|TestPredFlag), #if HAVE_SELECT InitCPred ("stream_select", 3, p_stream_select, SafePredFlag|SyncPredFlag); #endif #if USE_SOCKET InitSockets (); #endif InitPlIO (); #if HAVE_LIBREADLINE InitReadline(); #endif }