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-rw-r--r--source3/lib/xfile.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/source3/lib/xfile.c b/source3/lib/xfile.c
index b5710f3a39..7621712e9a 100644
--- a/source3/lib/xfile.c
+++ b/source3/lib/xfile.c
@@ -43,6 +43,7 @@ XFILE *x_stderr = &_x_stderr;
#define X_FLAG_EOF 1
#define X_FLAG_ERROR 2
+#define X_FLAG_EINVAL 3
/* simulate setvbuf() */
int x_setvbuf(XFILE *f, char *buf, int mode, size_t size)
@@ -341,3 +342,36 @@ char *x_fgets(char *s, int size, XFILE *stream)
*s = 0;
return s0;
}
+
+/* trivial seek, works only for SEEK_SET and SEEK_END if SEEK_CUR is
+ * set then an error is returned */
+off_t x_tseek(XFILE *f, off_t offset, int whence)
+{
+ if (f->flags & X_FLAG_ERROR)
+ return -1;
+
+ /* only SEEK_SET and SEEK_END are supported */
+ /* SEEK_CUR needs internal offset counter */
+ if (whence != SEEK_SET && whence != SEEK_END) {
+ f->flags |= X_FLAG_EINVAL;
+ errno = EINVAL;
+ return -1;
+ }
+
+ /* empty the buffer */
+ switch (f->open_flags & O_ACCMODE) {
+ case O_RDONLY:
+ f->bufused = 0;
+ break;
+ case O_WRONLY:
+ if (x_fflush(f) != 0)
+ return -1;
+ break;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ f->flags &= ~X_FLAG_EOF;
+ return (off_t)sys_lseek(f->fd, offset, whence);
+}