348 lines
8.7 KiB
C
Executable File
348 lines
8.7 KiB
C
Executable File
/*************************************************************************
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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: mem.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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* This file includes the definition of a socket related IO.
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*
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*/
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#define _GNU_SOURCE
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#include "YapText.h"
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#include "format.h"
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#include "sysbits.h"
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#if HAVE_FMEMOPEN
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int format_synch(int sno, int sno0, format_info *fg) {
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const char *s;
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int n;
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if (sno != sno0) {
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fflush(GLOBAL_Stream[sno].file);
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n = ftell(GLOBAL_Stream[sno].file);
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s = GLOBAL_Stream[sno].nbuf;
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if (GLOBAL_Stream[sno0].vfs) {
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int ch;
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int (*f)() = GLOBAL_Stream[sno0].vfs->put_char;
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while ((ch = *s++)) {
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f(sno0, ch);
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}
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} else {
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fwrite(s, n, 1, GLOBAL_Stream[sno0].file);
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}
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rewind(GLOBAL_Stream[sno].file);
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fg->lstart = 0;
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fg->phys_start = 0;
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fg->gapi = 0;
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}
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Yap_flush(sno0);
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return sno;
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}
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bool fill_pads(int sno, int sno0, int total, format_info *fg USES_REGS)
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// uses directly the buffer in the memory stream.
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{
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int nfillers, fill_space, lfill_space, nchars;
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int (*f_putc)(int, int);
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const char *buf;
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int phys_end;
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f_putc = GLOBAL_Stream[sno0].stream_putc;
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if (fflush(GLOBAL_Stream[sno].file) == 0) {
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buf = GLOBAL_Stream[sno].nbuf;
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phys_end = ftell(GLOBAL_Stream[sno].file);
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} else
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return false;
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if (fg->gapi == 0) {
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fg->gap[0].phys = phys_end;
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fg->gap[0].filler = ' ';
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fg->gapi = 1;
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}
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nchars = total - GLOBAL_Stream[sno].linepos;
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if (nchars < 0)
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nchars = 0; /* ignore */
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nfillers = fg->gapi;
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fill_space = nchars / nfillers;
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lfill_space = nchars % nfillers;
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int i = fg->phys_start;
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gap_t *padi = fg->gap;
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while (i < phys_end) {
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if (i == padi->phys) {
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int j;
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for (j = 0; j < fill_space; j++)
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f_putc(sno0, padi->filler);
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padi++;
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/* last gap??*/
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if (padi - fg->gap == fg->gapi) {
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for (j = 0; j < fill_space; j++)
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f_putc(sno0, (padi - 1)->filler);
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}
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}
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f_putc(sno0, buf[i++]);
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}
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// final gap
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if (i == padi->phys) {
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int j;
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for (j = 0; j < fill_space + lfill_space; j++)
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f_putc(sno0, padi->filler);
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};
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rewind(GLOBAL_Stream[sno].file);
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Yap_flush(sno0);
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GLOBAL_Stream[sno].linecount = 1;
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GLOBAL_Stream[sno].linepos += nchars;
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GLOBAL_Stream[sno].charcount = 0;
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GLOBAL_Stream[sno].buf.on = false;
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fg->phys_start = 0;
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fg->lstart = GLOBAL_Stream[sno].linepos;
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fg->gapi = 0;
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return true;
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}
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bool Yap_set_stream_to_buf(StreamDesc *st, const char *buf,
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size_t nchars USES_REGS) {
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FILE *f;
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// like any file stream.
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st->file = f = fmemopen((char *)buf, nchars, "r");
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st->status = Input_Stream_f | Seekable_Stream_f | InMemory_Stream_f;
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st->vfs = NULL;
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st->buf.on = false;
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st->encoding = LOCAL_encoding;
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Yap_DefaultStreamOps(st);
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st->linecount = 0;
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st->linepos = st->charcount = 0;
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return true;
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}
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char *Yap_StrPrefix( const char *buf, size_t n) {
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char *b = (char*)malloc(n);
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strncpy(b, buf, n - 1);
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if (strlen(buf) > n - 1)
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b[15] = '\0';
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return b;
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}
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int Yap_open_buf_read_stream(const char *buf, size_t nchars,
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encoding_t *encp, memBufSource src, Atom fname,
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Term uname) {
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CACHE_REGS
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int sno;
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StreamDesc *st;
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FILE *f;
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encoding_t encoding;
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stream_flags_t flags;
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sno = GetFreeStreamD();
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if (sno < 0)
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return (PlIOError(RESOURCE_ERROR_MAX_STREAMS, TermNil,
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"new stream not available for open_mem_read_stream/1"));
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st = GLOBAL_Stream + sno;
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if (encp)
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encoding = *encp;
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else
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encoding = LOCAL_encoding;
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// like any file stream.
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f = st->file = fmemopen((void *)buf, nchars, "r");
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st->vfs = NULL;
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flags = Input_Stream_f | InMemory_Stream_f | Seekable_Stream_f;
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Yap_initStream(sno, f, fname, "r", uname, encoding, flags, NULL);
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// like any file stream.
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Yap_DefaultStreamOps(st);
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UNLOCK(st->streamlock);
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return sno;
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}
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static Int
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open_mem_read_stream(USES_REGS1) /* $open_mem_read_stream(+List,-Stream) */
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{
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Term t, ti;
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int sno;
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const char *buf;
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ti = Deref(ARG1);
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int l = push_text_stack();
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buf = Yap_TextTermToText(ti);
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if (!buf) {
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pop_text_stack(l);
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return false;
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}
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buf = pop_output_text_stack(l, buf);
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sno = Yap_open_buf_read_stream(buf, strlen(buf) + 1, &LOCAL_encoding,
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MEM_BUF_MALLOC, Yap_LookupAtom(Yap_StrPrefix((char *)buf,16)), TermNone);
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t = Yap_MkStream(sno);
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return Yap_unify(ARG2, t);
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}
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// open a buffer for writing, currently just ignores buf and nchars.
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int Yap_open_buf_write_stream(encoding_t enc, memBufSource src) {
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CACHE_REGS
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int sno;
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StreamDesc *st;
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sno = GetFreeStreamD();
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if (sno < 0)
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return -1;
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st = GLOBAL_Stream + sno;
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st->status = Output_Stream_f | InMemory_Stream_f;
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st->linepos = 0;
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st->charcount = 0;
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st->linecount = 1;
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st->encoding = enc;
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st->vfs = NULL;
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st->buf.on = true;
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st->nbuf = NULL;
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st->status |= Seekable_Stream_f;
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#if HAVE_OPEN_MEMSTREAM
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st->file = open_memstream(&st->nbuf, &st->nsize);
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// setbuf(st->file, NULL);
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#else
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st->file = fmemopen((void *)st->nbuf, st->nsize, "w+");
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#endif
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Yap_DefaultStreamOps(st);
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UNLOCK(st->streamlock);
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return sno;
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}
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int Yap_OpenBufWriteStream(USES_REGS1) {
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return Yap_open_buf_write_stream(
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GLOBAL_Stream[LOCAL_c_output_stream].encoding, 0);
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}
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static Int
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open_mem_write_stream(USES_REGS1) /* $open_mem_write_stream(-Stream) */
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{
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Term t;
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int sno;
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sno = Yap_OpenBufWriteStream(PASS_REGS1);
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if (sno == -1)
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return (PlIOError(SYSTEM_ERROR_INTERNAL, TermNil,
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"new stream not available for open_mem_read_stream/1"));
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t = Yap_MkStream(sno);
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GLOBAL_Stream[sno].status |= InMemory_Stream_f;
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return (Yap_unify(ARG1, t));
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}
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/**
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* Yap_PeekMemwriteStream() shows the current buffer for a memory stream.
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*
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* @param sno, the in-memory stream
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*
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* @return temporary buffer, discarded by close and may be moved away
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* by other writes..
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*/
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char *Yap_MemExportStreamPtr(int sno) {
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FILE *f = GLOBAL_Stream[sno].file;
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if (fflush(f) < 0) {
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return NULL;
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}
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if (fseek(f, 0, SEEK_END) < 0) {
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return NULL;
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}
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size_t len = ftell(f);
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char *buf = malloc(len+1);
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#if HAVE_OPEN_MEMSTREAM
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char *s = GLOBAL_Stream[sno].nbuf;
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memcpy(buf, s, len);
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// s[fseek(GLOBAL_Stream[sno].file, 0, SEEK_END)] = '\0';
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#else
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fread(buf, len, 1, GLOBAL_Stream[sno].file);
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#endif
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buf[len] = '\0';
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return buf;
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}
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static Int peek_mem_write_stream(
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USES_REGS1) { /* '$peek_mem_write_stream'(+GLOBAL_Stream,?S0,?S) */
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Int sno =
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Yap_CheckStream(ARG1, (Output_Stream_f | InMemory_Stream_f), "close/2");
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Term tf = ARG2;
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CELL *HI;
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char *ptr;
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int ch;
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if (sno < 0)
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return (FALSE);
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char *p = ptr = Yap_MemExportStreamPtr(sno);
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restart:
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HI = HR;
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while ((ch = *p++)) {
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HR[0] = MkIntTerm(ch);
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HR[1] = AbsPair(HR+2);
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HR += 2;
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if (HR + 1024 >= ASP) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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HR = HI;
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if (!Yap_gcl((ASP - HI) * sizeof(CELL), 3, ENV, Yap_gcP())) {
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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Yap_Error(RESOURCE_ERROR_STACK, TermNil, LOCAL_ErrorMessage);
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return (FALSE);
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}
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LOCK(GLOBAL_Stream[sno].streamlock);
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goto restart;
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}
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}
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HR[-1] = tf;
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UNLOCK(GLOBAL_Stream[sno].streamlock);
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free(ptr);
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return (Yap_unify(ARG3, AbsPair(HI)));
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}
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void Yap_MemOps(StreamDesc *st) {
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st->stream_putc = FilePutc;
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st->stream_getc = PlGetc;
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}
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bool Yap_CloseMemoryStream(int sno) {
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if ((GLOBAL_Stream[sno].status & Output_Stream_f) &&
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GLOBAL_Stream[sno].file) {
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fflush(GLOBAL_Stream[sno].file);
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fclose(GLOBAL_Stream[sno].file);
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if (GLOBAL_Stream[sno].status & FreeOnClose_Stream_f)
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free(GLOBAL_Stream[sno].nbuf);
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} else {
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if (GLOBAL_Stream[sno].file)
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fclose(GLOBAL_Stream[sno].file);
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if (GLOBAL_Stream[sno].status & FreeOnClose_Stream_f)
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free(GLOBAL_Stream[sno].nbuf);
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}
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GLOBAL_Stream[sno].status = Free_Stream_f;
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return true;
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}
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void Yap_InitMems(void) {
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CACHE_REGS
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Yap_InitCPred("open_mem_read_stream", 2, open_mem_read_stream, SyncPredFlag);
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Yap_InitCPred("open_mem_write_stream", 1, open_mem_write_stream,
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SyncPredFlag);
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Yap_InitCPred("peek_mem_write_stream", 3, peek_mem_write_stream,
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SyncPredFlag);
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}
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#endif
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