[Bug stdio/16680] New: ftell does not give the correct output for append mode files after a rewind
siddhesh at redhat dot com
sourceware-bugzilla@sourceware.org
Mon Mar 10 11:46:00 GMT 2014
https://sourceware.org/bugzilla/show_bug.cgi?id=16680
Bug ID: 16680
Summary: ftell does not give the correct output for append mode
files after a rewind
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: stdio
Assignee: siddhesh at redhat dot com
Reporter: siddhesh at redhat dot com
ftell continues to (incorrectly) return the end of the file as the current
position for files opened in any of the append modes when the file stream is
rewound, instead of returning the offset as 0.
To reproduce:
#include <stdio.h>
#include <string.h>
const char *data = "qwertyuioplkjhgfdsazxcvbnm";
int
main ()
{
FILE *stream = fopen("/tmp/foo.out", "a");
long pos = ftell(stream); // pos is zero as expected
fwrite(data, 1, strlen (data) + 1, stream);
pos = ftell(stream); // pos is the length of the written string
printf ("ftell: %ld\n", pos);
rewind(stream);
pos = ftell(stream); // FAILURE happens here, pos is not zero
printf ("ftell: %ld\n", pos);
}
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