diff options
Diffstat (limited to 'libio/ioseekoff.c')
| -rw-r--r-- | libio/ioseekoff.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/libio/ioseekoff.c b/libio/ioseekoff.c index 54a8d19f0d..4a951dd7c1 100644 --- a/libio/ioseekoff.c +++ b/libio/ioseekoff.c @@ -24,6 +24,13 @@ General Public License. */ #include <libioP.h> +#include <errno.h> +#ifndef errno +extern int errno; +#endif +#ifndef __set_errno +# define __set_errno(Val) errno = (Val) +#endif _IO_fpos64_t _IO_seekoff (fp, offset, dir, mode) @@ -34,13 +41,18 @@ _IO_seekoff (fp, offset, dir, mode) { _IO_fpos64_t retval; + if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) + { + __set_errno (EINVAL); + return EOF; + } + /* If we have a backup buffer, get rid of it, since the __seekoff callback may not know to do the right thing about it. This may be over-kill, but it'll do for now. TODO */ _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); _IO_flockfile (fp); - if (mode != 0 && _IO_have_backup (fp)) { if (dir == _IO_seek_cur && _IO_in_backup (fp)) |