141 lines
2.4 KiB
C
141 lines
2.4 KiB
C
#include "config.h"
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#include "f2c.h"
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#include "fio.h"
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#include <sys/types.h>
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#include <unistd.h>
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#ifdef KR_headers
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extern char *strcpy();
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extern FILE *tmpfile();
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#else
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#undef abs
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#undef min
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#undef max
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#include <stdlib.h>
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#include <string.h>
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#endif
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extern char *f__r_mode[], *f__w_mode[];
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#ifdef KR_headers
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integer f_end(a) alist *a;
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#else
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integer f_end(alist *a)
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#endif
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{
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unit *b;
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FILE *tf;
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if (f__init & 2)
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f__fatal (131, "I/O recursion");
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if(a->aunit>=MXUNIT || a->aunit<0) err(a->aerr,101,"endfile");
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b = &f__units[a->aunit];
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if(b->ufd==NULL) {
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char nbuf[10];
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sprintf(nbuf,"fort.%ld",(long)a->aunit);
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if (tf = fopen(nbuf, f__w_mode[0]))
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fclose(tf);
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return(0);
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}
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b->uend=1;
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return(b->useek ? t_runc(a) : 0);
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}
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#ifndef HAVE_FTRUNCATE
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static int
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#ifdef KR_headers
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copy(from, len, to) FILE *from, *to; register long len;
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#else
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copy(FILE *from, register long len, FILE *to)
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#endif
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{
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int len1;
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char buf[BUFSIZ];
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while(fread(buf, len1 = len > BUFSIZ ? BUFSIZ : (int)len, 1, from)) {
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if (!fwrite(buf, len1, 1, to))
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return 1;
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if ((len -= len1) <= 0)
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break;
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}
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return 0;
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}
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#endif /* !defined(HAVE_FTRUNCATE) */
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int
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#ifdef KR_headers
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t_runc(a) alist *a;
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#else
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t_runc(alist *a)
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#endif
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{
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off_t loc, len;
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unit *b;
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int rc;
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FILE *bf;
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#ifndef HAVE_FTRUNCATE
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FILE *tf;
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#endif /* !defined(HAVE_FTRUNCATE) */
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b = &f__units[a->aunit];
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if(b->url)
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return(0); /*don't truncate direct files*/
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loc=FTELL(bf = b->ufd);
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FSEEK(bf,0,SEEK_END);
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len=FTELL(bf);
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if (loc >= len || b->useek == 0 || b->ufnm == NULL)
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return(0);
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#ifndef HAVE_FTRUNCATE
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rc = 0;
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fclose(b->ufd);
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if (!loc) {
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if (!(bf = fopen(b->ufnm, f__w_mode[b->ufmt])))
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rc = 1;
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if (b->uwrt)
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b->uwrt = 1;
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goto done;
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}
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if (!(bf = fopen(b->ufnm, f__r_mode[0]))
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|| !(tf = tmpfile())) {
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#ifdef NON_UNIX_STDIO
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bad:
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#endif
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rc = 1;
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goto done;
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}
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if (copy(bf, loc, tf)) {
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bad1:
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rc = 1;
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goto done1;
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}
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if (!(bf = freopen(b->ufnm, f__w_mode[0], bf)))
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goto bad1;
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FSEEK(tf, 0, SEEK_SET);
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if (copy(tf, loc, bf))
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goto bad1;
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b->uwrt = 1;
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b->urw = 2;
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#ifdef NON_UNIX_STDIO
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if (b->ufmt) {
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fclose(bf);
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if (!(bf = fopen(b->ufnm, f__w_mode[3])))
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goto bad;
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FSEEK(bf,0,SEEK_END);
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b->urw = 3;
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}
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#endif
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done1:
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fclose(tf);
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done:
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f__cf = b->ufd = bf;
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#else /* !defined(HAVE_FTRUNCATE) */
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fflush(b->ufd);
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rc = ftruncate(fileno(b->ufd), loc);
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FSEEK(bf,loc,SEEK_SET);
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#endif /* !defined(HAVE_FTRUNCATE) */
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if (rc)
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err(a->aerr,111,"endfile");
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return 0;
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}
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