1984-07-20 11:03:31 +00:00
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/* $Header$ */
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1984-07-20 10:44:57 +00:00
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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 <pc_file.h>
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#include <pc_err.h>
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extern char *_hbase;
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extern int *_extfl;
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extern struct file *_curfil;
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extern int _pargc;
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extern char **_pargv;
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extern char **_penvp;
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extern _cls();
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extern _xcls();
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extern _trp();
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extern int getpid();
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extern int creat();
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extern int open();
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extern int close();
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extern int unlink();
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extern long lseek();
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static int tmpfil() {
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int i; char *p,*q;
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i = getpid();
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p = "/usr/tmp/plf.xxxxx";
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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: _trp(EREWR);
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return(i);
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}
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static int initfl(descr,sz,f) int descr; int sz; struct file *f; {
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int i;
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_curfil = f;
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if (sz == 0) {
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sz++;
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descr |= TXTBIT;
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}
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for (i=1; i<=_extfl[0]; i++)
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if (f == EXTFL(i))
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break;
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if (i > _extfl[0]) { /* 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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_xcls(f);
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if (lseek(f->ufd,(long)0,0) == -1)
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_trp(ERESET);
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} else {
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_cls(f);
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f->ufd = tmpfil();
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}
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} else { /* external file */
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if ((i -= 2) <= 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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if ((f->ufd = open(f->fname,0)) < 0)
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_trp(ERESET);
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} else {
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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>512 ? sz : 512-512%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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_opn(sz,f) int sz; struct file *f; {
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if (initfl(MAGIC,sz,f))
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f->count = 0;
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}
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_cre(sz,f) int sz; struct file *f; {
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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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