120 lines
2.1 KiB
C
120 lines
2.1 KiB
C
/* $Id$ */
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/* Author: J.W. Stevenson */
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "pc.h"
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static int tmpfil(void)
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{
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static char namebuf[] = "/tmp/plf.xxxxx";
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int i;
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char *p, *q;
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i = getpid();
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p = namebuf;
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q = p + 13;
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do
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*q++ = (i & 07) + '0';
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while (i >>= 3);
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*q = '\0';
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if ((i = creat(p, 0644)) < 0)
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if ((i = creat(p += 4, 0644)) < 0)
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if ((i = creat(p += 5, 0644)) < 0)
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goto error;
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if (close(i) != 0)
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goto error;
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if ((i = open(p, 2)) < 0)
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goto error;
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if (unlink(p) != 0)
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error:
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_trp(EREWR);
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return (i);
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}
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static int initfl(int descr, int sz, struct file* f)
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{
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int i;
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_curfil = f;
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if (sz == 0)
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{
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sz++;
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descr |= TXTBIT;
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}
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for (i = 0; i < _extflc; i++)
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if (f == _extfl[i])
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break;
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if (i >= _extflc)
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{ /* local file */
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f->fname = "LOCAL";
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if ((descr & WRBIT) == 0 && (f->flags & 0377) == MAGIC)
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{
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_xcls(f);
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if (lseek(f->ufd, (long)0, 0) == -1)
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_trp(ERESET);
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}
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else
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{
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_cls(f);
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f->ufd = tmpfil();
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}
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}
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else
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{ /* external file */
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if (--i <= 0)
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return (0);
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if (i >= _pargc)
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_trp(EARGC);
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f->fname = _pargv[i];
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_cls(f);
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if ((descr & WRBIT) == 0)
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{
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if ((f->ufd = open(f->fname, 0)) < 0)
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_trp(ERESET);
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}
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else
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{
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if ((f->ufd = creat(f->fname, 0644)) < 0)
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_trp(EREWR);
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}
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}
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f->buflen = (sz > PC_BUFLEN ? sz : PC_BUFLEN - PC_BUFLEN % sz);
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f->size = sz;
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f->ptr = f->bufadr;
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f->flags = descr;
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return (1);
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}
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void _opn(int sz, struct file* f)
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{
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if (initfl(MAGIC, sz, f))
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f->count = 0;
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}
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void _cre(int sz, struct file* f)
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{
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if (initfl(WRBIT | EOFBIT | ELNBIT | MAGIC, sz, f))
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f->count = f->buflen;
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}
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