272 lines
6.5 KiB
C
272 lines
6.5 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: readline.c *
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* Last rev: 5/2/88 *
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* mods: *
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* comments: Input/Output C implemented predicates *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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/**
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* @file console.c
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* @author VITOR SANTOS COSTA <vsc@VITORs-MBP.lan>
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* @date Wed Jan 20 00:56:23 2016
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*
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* @brief
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*
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*
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*/
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/*
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* This file includes the interface to the console IO, tty style. Refer also to the readline library.
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* @defgroup console Support for console-based interaction.
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* @ingroup InputOutput
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*/
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#include "sysbits.h"
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static Int prompt( USES_REGS1 );
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static Int prompt1( USES_REGS1 );
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static int ConsoleGetc( int);
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static int ConsolePutc( int, int);
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/* check if we read a newline or an EOF */
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int
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console_post_process_read_char(int ch, StreamDesc *s)
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{
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/* the character is also going to be output by the console handler */
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console_count_output_char(ch,GLOBAL_Stream+StdErrStream);
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if (ch == '\n') {
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CACHE_REGS
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++s->linecount;
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++s->charcount;
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s->linepos = 0;
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LOCAL_newline = true;
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} else {
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CACHE_REGS
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++s->charcount;
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++s->linepos;
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LOCAL_newline = false;
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}
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return ch;
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}
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bool
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is_same_tty(FILE *f1, FILE *f2)
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{
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#if HAVE_TTYNAME
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return(ttyname(fileno(f1)) == ttyname(fileno(f2)));
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#else
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// assume a single console, for now
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return true;
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#endif
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}
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static Int
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is_same_tty2 (USES_REGS1)
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{ /* 'prompt(Atom) */
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int sni = Yap_CheckStream (ARG1, Input_Stream_f, "put/2");
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int sno = Yap_CheckStream (ARG2, Output_Stream_f, "put/2");
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bool out = (GLOBAL_Stream[sni].status & Tty_Stream_f) &&
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(GLOBAL_Stream[sno].status & Tty_Stream_f) &&
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is_same_tty(GLOBAL_Stream[sno].file,GLOBAL_Stream[sni].file);
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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UNLOCK(GLOBAL_Stream[sni].streamlock);
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return out;
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}
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void
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Yap_ConsoleOps( StreamDesc *s, bool recursive )
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{
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if (!recursive)
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Yap_DefaultStreamOps( s );
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/* the putc routine only has to check it is putting out a newline */
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s->stream_putc = ConsolePutc;
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#if USE_READLINE
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/* if a tty have a special routine to call readline */
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if (( s->status & Readline_Stream_f) &&
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trueGlobalPrologFlag(READLINE_FLAG) ) {
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if (Yap_ReadlineOps( s ))
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return;
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}
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#endif
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s->stream_getc = ConsoleGetc;
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}
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/* static */
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static int
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ConsolePutc (int sno, int ch)
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{
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StreamDesc *s = &GLOBAL_Stream[sno];
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#if MAC || _MSC_VER || defined(__MINGW32__)
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if (ch == 10)
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{
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putc ('\n', s->file);
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LOCAL_newline = true;
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}
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else
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#endif
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putc (ch, s->file);
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console_count_output_char(ch,s);
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return ((int) ch);
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}
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/* send a prompt, and use the system for internal buffering. Speed is
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not of the essence here !!! */
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static int
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ConsoleGetc(int sno)
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{
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CACHE_REGS
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register StreamDesc *s = &GLOBAL_Stream[sno];
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int ch;
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restart:
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/* keep the prompt around, just in case, but don't actually
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show it in silent mode */
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if (LOCAL_newline) {
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if (!silentMode()) {
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char *cptr = LOCAL_Prompt, ch;
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/* use the default routine */
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while ((ch = *cptr++) != '\0') {
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GLOBAL_Stream[StdErrStream].stream_putc(StdErrStream, ch);
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}
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}
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strncpy (LOCAL_Prompt, (char *)RepAtom (LOCAL_AtPrompt)->StrOfAE, MAX_PROMPT);
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LOCAL_newline = FALSE;
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}
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#if HAVE_SIGINTERRUPT
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siginterrupt(SIGINT, TRUE);
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#endif
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LOCAL_PrologMode |= ConsoleGetcMode;
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ch = fgetc(s->file);
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#if HAVE_SIGINTERRUPT
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siginterrupt(SIGINT, FALSE);
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#endif
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if (LOCAL_PrologMode & InterruptMode) {
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Yap_external_signal( 0, YAP_INT_SIGNAL );
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LOCAL_PrologMode &= ~ConsoleGetcMode;
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LOCAL_newline = TRUE;
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if (LOCAL_PrologMode & AbortMode) {
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Yap_Error(ABORT_EVENT, TermNil, "");
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LOCAL_ErrorMessage = "Abort";
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return EOF;
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}
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goto restart;
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} else {
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LOCAL_PrologMode &= ~ConsoleGetcMode;
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}
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if (ch == EOF)
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return EOF;
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return ch;
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}
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/** @pred prompt1(+ _A__)
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Changes YAP input prompt for the .
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*/
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static Int
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prompt1 ( USES_REGS1 )
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{ /* prompt1(Atom) */
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Term t = Deref(ARG1);
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Atom a;
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if (IsVarTerm (t) || !IsAtomTerm (t))
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return (FALSE);
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LOCAL_AtPrompt = a = AtomOfTerm (t);
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if (strlen ((char *)RepAtom (a)->StrOfAE) > MAX_PROMPT) {
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Yap_Error(SYSTEM_ERROR_INTERNAL,t,"prompt %s is too long", RepAtom (a)->StrOfAE);
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return(FALSE);
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}
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strncpy(LOCAL_Prompt, (char *)RepAtom (a)->StrOfAE, MAX_PROMPT);
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return (TRUE);
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}
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/** @pred prompt(- _A_,+ _B_)
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Changes YAP input prompt from _A_ to _B_, active on *next* standard input interaction.
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*/
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static Int
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prompt ( USES_REGS1 )
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{ /* prompt(Old,New) */
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Term t = Deref (ARG2);
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Atom a;
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if (!Yap_unify_constant (ARG1, MkAtomTerm (LOCAL_AtPrompt)))
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return (FALSE);
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if (IsVarTerm (t) || !IsAtomTerm (t))
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return (FALSE);
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a = AtomOfTerm (t);
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if (strlen(RepAtom (a)->StrOfAE) > MAX_PROMPT) {
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Yap_Error(SYSTEM_ERROR_INTERNAL,t,"prompt %s is too long", RepAtom (a)->StrOfAE);
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return false;
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}
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strncpy(LOCAL_Prompt, (char *)RepAtom (LOCAL_AtPrompt)->StrOfAE, MAX_PROMPT);
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LOCAL_AtPrompt = a;
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return (TRUE);
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}
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/** @pred ensure_prompting
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Make sure we have a prompt at this point, even if we have to
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introduce a new line.
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*/
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static Int
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ensure_prompting ( USES_REGS1 )
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{ /* prompt(Old,New) */
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if (!LOCAL_newline) {
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GLOBAL_Stream[2].stream_wputc(2, 10); // hack!
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}
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return true;
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}
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int
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Yap_GetCharForSIGINT(void)
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{
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CACHE_REGS
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int ch;
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#if USE_READLINE
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if (trueGlobalPrologFlag(READLINE_FLAG) ||
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(ch = Yap_ReadlineForSIGINT()) == 0)
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#endif
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{ /* ask for a new line */
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fprintf(stderr, "Action (h for help): ");
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ch = getc(stdin);
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/* first process up to end of line */
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while ((fgetc(stdin)) != '\n');
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}
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LOCAL_newline = TRUE;
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return ch;
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}
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void Yap_InitConsole(void) {
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CACHE_REGS
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LOCAL_newline = true;
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Yap_InitCPred ("prompt", 1, prompt1, SafePredFlag|SyncPredFlag);
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Yap_InitCPred ("prompt1", 1, prompt1, SafePredFlag|SyncPredFlag);
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Yap_InitCPred ("$is_same_tty", 2, is_same_tty2, SafePredFlag|SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred ("prompt", 2, prompt, SafePredFlag|SyncPredFlag);
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Yap_InitCPred ("$ensure_prompting", 0, ensure_prompting, SafePredFlag|SyncPredFlag);
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}
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