From 0c69b0498400f6664df5375fcebf996ba7719f42 Mon Sep 17 00:00:00 2001 From: ache Date: Sat, 1 Sep 2001 14:40:01 +0000 Subject: Make fseek(... SEEK_CUR) fails if current file-position is unspecified. --- lib/libc/stdio/fseek.3 | 8 ++------ lib/libc/stdio/fseek.c | 8 ++++++-- 2 files changed, 8 insertions(+), 8 deletions(-) (limited to 'lib') diff --git a/lib/libc/stdio/fseek.3 b/lib/libc/stdio/fseek.3 index b08bbc8..fe7f313 100644 --- a/lib/libc/stdio/fseek.3 +++ b/lib/libc/stdio/fseek.3 @@ -206,12 +206,8 @@ for and .Fn ftell . .It Bq Er ESPIPE -The file descriptor underlying stream is associated with a pipe or FIFO. -For -.Fn ftell -and -.Fn ftello , -file-position indicator value is unspecified +The file descriptor underlying stream is associated with a pipe or FIFO +or file-position indicator value is unspecified (see .Xr ungetc 3 ) . .El diff --git a/lib/libc/stdio/fseek.c b/lib/libc/stdio/fseek.c index d06e408..b2d98a9 100644 --- a/lib/libc/stdio/fseek.c +++ b/lib/libc/stdio/fseek.c @@ -131,8 +131,12 @@ _fseeko(fp, offset, whence, ltest) */ if (_ftello(fp, &curoff)) return (-1); - if ((offset > 0 && curoff > OFF_MAX - offset) || - (offset < 0 && curoff < OFF_MIN - offset)) { + if (curoff < 0) { + /* Unspecified position because of ungetc() at 0 */ + errno = ESPIPE; + return (-1); + } + if (offset > 0 && curoff > OFF_MAX - offset) { errno = EOVERFLOW; return (-1); } -- cgit v1.1