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Make fseek(... SEEK_CUR) fails if current file-position is unspecified.

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ache 2001-09-01 14:40:01 +00:00
parent 6c12b81f9e
commit 8f0ae93dff
2 changed files with 8 additions and 8 deletions
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8
lib/libc/stdio/fseek.3
View File

@ -206,12 +206,8 @@ for
and and
.Fn ftell . .Fn ftell .
.It Bq Er ESPIPE .It Bq Er ESPIPE
The file descriptor underlying stream is associated with a pipe or FIFO. The file descriptor underlying stream is associated with a pipe or FIFO
For or file-position indicator value is unspecified
.Fn ftell
and
.Fn ftello ,
file-position indicator value is unspecified
(see (see
.Xr ungetc 3 ) . .Xr ungetc 3 ) .
.El .El

8
lib/libc/stdio/fseek.c
View File

@ -131,8 +131,12 @@ _fseeko(fp, offset, whence, ltest)
*/ */
if (_ftello(fp, &curoff)) if (_ftello(fp, &curoff))
return (-1); return (-1);
if ((offset > 0 && curoff > OFF_MAX - offset) || if (curoff < 0) {
(offset < 0 && curoff < OFF_MIN - offset)) { /* Unspecified position because of ungetc() at 0 */
errno = ESPIPE;
return (-1);
}
if (offset > 0 && curoff > OFF_MAX - offset) {
errno = EOVERFLOW; errno = EOVERFLOW;
return (-1); return (-1);
} }