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yap-6.3/os/console.c
Vítor Santos Costa b871f6676e fix error handling
2015-09-25 10:57:26 +01:00

246 lines
5.9 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: readline.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 interface to the console IO, tty style. Refer also to the readline library.
*
*/
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "yapio.h"
#include <stdlib.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#ifdef _WIN32
#if HAVE_IO_H
/* Windows */
#include <io.h>
#endif
#if HAVE_SOCKET
#include <winsock2.h>
#endif
#include <windows.h>
#ifndef S_ISDIR
#define S_ISDIR(x) (((x)&_S_IFDIR)==_S_IFDIR)
#endif
#endif
#include "iopreds.h"
static Int prompt( USES_REGS1 );
static Int prompt1( USES_REGS1 );
static int ConsoleGetc( int);
static int ConsolePutc( int, int);
/* check if we read a newline or an EOF */
int
console_post_process_read_char(int ch, StreamDesc *s)
{
/* the character is also going to be output by the console handler */
console_count_output_char(ch,GLOBAL_Stream+StdErrStream);
if (ch == '\n') {
CACHE_REGS
++s->linecount;
++s->charcount;
s->linepos = 0;
LOCAL_newline = TRUE;
} else {
CACHE_REGS
++s->charcount;
++s->linepos;
LOCAL_newline = FALSE;
}
return ch;
}
bool
is_same_tty(FILE *f1, FILE *f2)
{
#if HAVE_TTYNAME
return(ttyname(fileno(f1)) == ttyname(fileno(f2)));
#else
return;
#endif
}
static Int
is_same_tty2 (USES_REGS1)
{ /* 'prompt(Atom) */
int sni = Yap_CheckStream (ARG1, Input_Stream_f, "put/2");
int sno = Yap_CheckStream (ARG2, Output_Stream_f, "put/2");
bool out = (GLOBAL_Stream[sni].status & Tty_Stream_f) &&
(GLOBAL_Stream[sno].status & Tty_Stream_f) &&
is_same_tty(GLOBAL_Stream[sno].file,GLOBAL_Stream[sni].file);
UNLOCK(GLOBAL_Stream[sno].streamlock);
UNLOCK(GLOBAL_Stream[sni].streamlock);
return out;
}
void
Yap_ConsoleOps( StreamDesc *s )
{
/* 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 (!Yap_ReadlineOps( s )) {
/* else just PlGet plus checking for prompt */
s->stream_getc = ConsoleGetc;
}
Yap_DefaultStreamOps( s );
}
/* static */
static int
ConsolePutc (int sno, int ch)
{
StreamDesc *s = &GLOBAL_Stream[sno];
#if MAC || _MSC_VER || defined(__MINGW32__)
if (ch == 10)
{
putc ('\n', s->file);
}
else
#endif
putc (ch, s->file);
console_count_output_char(ch,s);
return ((int) ch);
}
/* send a prompt, and use the system for internal buffering. Speed is
not of the essence here !!! */
static int
ConsoleGetc(int sno)
{
CACHE_REGS
register StreamDesc *s = &GLOBAL_Stream[sno];
int ch;
restart:
/* keep the prompt around, just in case, but don't actually
show it in silent mode */
if (LOCAL_newline) {
if (silentMode()) {
char *cptr = LOCAL_Prompt, ch;
/* use the default routine */
while ((ch = *cptr++) != '\0') {
GLOBAL_Stream[StdErrStream].stream_putc(StdErrStream, ch);
}
}
strncpy (LOCAL_Prompt, (char *)RepAtom (LOCAL_AtPrompt)->StrOfAE, MAX_PROMPT);
LOCAL_newline = FALSE;
}
#if HAVE_SIGINTERRUPT
siginterrupt(SIGINT, TRUE);
#endif
LOCAL_PrologMode |= ConsoleGetcMode;
ch = fgetc(s->file);
#if HAVE_SIGINTERRUPT
siginterrupt(SIGINT, FALSE);
#endif
if (LOCAL_PrologMode & InterruptMode) {
Yap_external_signal( 0, YAP_INT_SIGNAL );
LOCAL_PrologMode &= ~ConsoleGetcMode;
LOCAL_newline = TRUE;
if (LOCAL_PrologMode & AbortMode) {
Yap_Error(ABORT_EVENT, TermNil, "");
LOCAL_ErrorMessage = "Abort";
return console_post_process_eof(s);
}
goto restart;
} else {
LOCAL_PrologMode &= ~ConsoleGetcMode;
}
if (ch == EOF)
return console_post_process_eof(s);
return console_post_process_read_char(ch, s);
}
static Int
prompt1 ( USES_REGS1 )
{ /* prompt1(Atom) */
Term t = Deref(ARG1);
Atom a;
if (IsVarTerm (t) || !IsAtomTerm (t))
return (FALSE);
LOCAL_AtPrompt = a = AtomOfTerm (t);
if (strlen ((char *)RepAtom (a)->StrOfAE) > MAX_PROMPT) {
Yap_Error(SYSTEM_ERROR_INTERNAL,t,"prompt %s is too long", RepAtom (a)->StrOfAE);
return(FALSE);
}
strncpy(LOCAL_Prompt, (char *)RepAtom (a)->StrOfAE, MAX_PROMPT);
return (TRUE);
}
static Int
prompt ( USES_REGS1 )
{ /* prompt(Old,New) */
Term t = Deref (ARG2);
Atom a;
if (!Yap_unify_constant (ARG1, MkAtomTerm (LOCAL_AtPrompt)))
return (FALSE);
if (IsVarTerm (t) || !IsAtomTerm (t))
return (FALSE);
a = AtomOfTerm (t);
if (strlen(RepAtom (a)->StrOfAE) > MAX_PROMPT) {
Yap_Error(SYSTEM_ERROR_INTERNAL,t,"prompt %s is too long", RepAtom (a)->StrOfAE);
return(FALSE);
}
strncpy(LOCAL_Prompt, (char *)RepAtom (LOCAL_AtPrompt)->StrOfAE, MAX_PROMPT);
LOCAL_AtPrompt = a;
return (TRUE);
}
int
Yap_GetCharForSIGINT(void)
{
CACHE_REGS
int ch;
if ((ch = Yap_ReadlineForSIGINT()) == 0)
{ /* ask for a new line */
fprintf(stderr, "Action (h for help): ");
ch = getc(stdin);
/* first process up to end of line */
while ((fgetc(stdin)) != '\n');
}
LOCAL_newline = TRUE;
return ch;
}
void Yap_InitConsole(void) {
Yap_InitCPred ("prompt", 1, prompt1, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("prompt1", 1, prompt1, SafePredFlag|SyncPredFlag);
Yap_InitCPred ("$is_same_tty", 2, is_same_tty2, SafePredFlag|SyncPredFlag|HiddenPredFlag);
Yap_InitCPred ("prompt", 2, prompt, SafePredFlag|SyncPredFlag);
}