| #include "f2c.h" |
| #include "fio.h" |
| |
| #include <unistd.h> |
| |
| #ifdef KR_headers |
| extern char *strcpy(); |
| extern FILE *tmpfile(); |
| #else |
| #undef abs |
| #undef min |
| #undef max |
| #include <stdlib.h> |
| #include <string.h> |
| #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 (f__init & 2) |
| f__fatal (131, "I/O recursion"); |
| 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); |
| } |
| |
| #ifndef HAVE_FTRUNCATE |
| 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 /* !defined(HAVE_FTRUNCATE) */ |
| |
| int |
| #ifdef KR_headers |
| t_runc(a) alist *a; |
| #else |
| t_runc(alist *a) |
| #endif |
| { |
| long loc, len; |
| unit *b; |
| int rc; |
| FILE *bf; |
| #ifndef HAVE_FTRUNCATE |
| FILE *tf; |
| #endif /* !defined(HAVE_FTRUNCATE) */ |
| |
| b = &f__units[a->aunit]; |
| if(b->url) |
| return(0); /*don't truncate direct files*/ |
| loc=ftell(bf = b->ufd); |
| fseek(bf,0L,SEEK_END); |
| len=ftell(bf); |
| if (loc >= len || b->useek == 0 || b->ufnm == NULL) |
| return(0); |
| #ifndef HAVE_FTRUNCATE |
| 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, loc, tf)) { |
| bad1: |
| rc = 1; |
| goto done1; |
| } |
| if (!(bf = freopen(b->ufnm, f__w_mode[0], bf))) |
| goto bad1; |
| rewind(tf); |
| if (copy(tf, 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,0L,SEEK_END); |
| b->urw = 3; |
| } |
| #endif |
| done1: |
| fclose(tf); |
| done: |
| f__cf = b->ufd = bf; |
| #else /* !defined(HAVE_FTRUNCATE) */ |
| fflush(b->ufd); |
| rc = ftruncate(fileno(b->ufd),loc); |
| #endif /* !defined(HAVE_FTRUNCATE) */ |
| if (rc) |
| err(a->aerr,111,"endfile"); |
| return 0; |
| } |