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-rw-r--r--lib/libc/stdio/ftell.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/libc/stdio/ftell.c b/lib/libc/stdio/ftell.c
index 2c8800c..1552485 100644
--- a/lib/libc/stdio/ftell.c
+++ b/lib/libc/stdio/ftell.c
@@ -97,6 +97,8 @@ _ftello(FILE *fp, fpos_t *offset)
* Find offset of underlying I/O object, then
* adjust for buffered bytes.
*/
+ if (__sflush(fp)) /* may adjust seek offset on append stream */
+ return (1);
if (fp->_flags & __SOFF)
pos = fp->_offset;
else {
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