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#include "f2c.h"
#include "fio.h"
/* Compile this with -DNO_TRUNCATE if unistd.h does not exist or */
/* if it does not define int truncate(const char *name, off_t). */
#ifdef MSDOS
#undef NO_TRUNCATE
#define NO_TRUNCATE
#endif
#ifndef NO_TRUNCATE
#include "unistd.h"
#endif
#ifdef KR_headers
extern char *strcpy();
extern FILE *tmpfile();
#else
#undef abs
#undef min
#undef max
#include "stdlib.h"
#include "string.h"
#ifdef __cplusplus
extern "C" {
#endif
#endif
extern char *f__r_mode[], *f__w_mode[];
#ifdef KR_headers
integer f_end(a) alist *a;
#else
integer f_end(alist *a)
#endif
{
unit *b;
FILE *tf;
if(a->aunit>=MXUNIT || a->aunit<0) err(a->aerr,101,"endfile");
b = &f__units[a->aunit];
if(b->ufd==NULL) {
char nbuf[10];
sprintf(nbuf,"fort.%ld",(long)a->aunit);
if (tf = FOPEN(nbuf, f__w_mode[0]))
fclose(tf);
return(0);
}
b->uend=1;
return(b->useek ? t_runc(a) : 0);
}
#ifdef NO_TRUNCATE
static int
#ifdef KR_headers
copy(from, len, to) FILE *from, *to; register long len;
#else
copy(FILE *from, register long len, FILE *to)
#endif
{
int len1;
char buf[BUFSIZ];
while(fread(buf, len1 = len > BUFSIZ ? BUFSIZ : (int)len, 1, from)) {
if (!fwrite(buf, len1, 1, to))
return 1;
if ((len -= len1) <= 0)
break;
}
return 0;
}
#endif /* NO_TRUNCATE */
int
#ifdef KR_headers
t_runc(a) alist *a;
#else
t_runc(alist *a)
#endif
{
OFF_T loc, len;
unit *b;
int rc;
FILE *bf;
#ifdef NO_TRUNCATE
FILE *tf;
#endif
b = &f__units[a->aunit];
if(b->url)
return(0); /*don't truncate direct files*/
loc=FTELL(bf = b->ufd);
FSEEK(bf,(OFF_T)0,SEEK_END);
len=FTELL(bf);
if (loc >= len || b->useek == 0)
return(0);
#ifdef NO_TRUNCATE
if (b->ufnm == NULL)
return 0;
rc = 0;
fclose(b->ufd);
if (!loc) {
if (!(bf = FOPEN(b->ufnm, f__w_mode[b->ufmt])))
rc = 1;
if (b->uwrt)
b->uwrt = 1;
goto done;
}
if (!(bf = FOPEN(b->ufnm, f__r_mode[0]))
|| !(tf = tmpfile())) {
#ifdef NON_UNIX_STDIO
bad:
#endif
rc = 1;
goto done;
}
if (copy(bf, (long)loc, tf)) {
bad1:
rc = 1;
goto done1;
}
if (!(bf = FREOPEN(b->ufnm, f__w_mode[0], bf)))
goto bad1;
rewind(tf);
if (copy(tf, (long)loc, bf))
goto bad1;
b->uwrt = 1;
b->urw = 2;
#ifdef NON_UNIX_STDIO
if (b->ufmt) {
fclose(bf);
if (!(bf = FOPEN(b->ufnm, f__w_mode[3])))
goto bad;
FSEEK(bf,(OFF_T)0,SEEK_END);
b->urw = 3;
}
#endif
done1:
fclose(tf);
done:
f__cf = b->ufd = bf;
#else /* NO_TRUNCATE */
if (b->urw & 2)
fflush(b->ufd); /* necessary on some Linux systems */
#ifndef FTRUNCATE
#define FTRUNCATE ftruncate
#endif
rc = FTRUNCATE(fileno(b->ufd), loc);
/* The following FSEEK is unnecessary on some systems, */
/* but should be harmless. */
FSEEK(b->ufd, (OFF_T)0, SEEK_END);
#endif /* NO_TRUNCATE */
if (rc)
err(a->aerr,111,"endfile");
return 0;
}
#ifdef __cplusplus
}
#endif
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