[Bug stdio/14543] New: fseek sets invalid status in the internal buffer in wide mode

[Bug stdio/14543] New: fseek sets invalid status in the internal buffer in wide mode

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14543

             Bug #: 14543
           Summary: fseek sets invalid status in the internal buffer in
                    wide mode
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
        AssignedTo: unassigned@sourceware.org
        ReportedBy: siddhesh@redhat.com
    Classification: Unclassified


fseek sets the pointers in the external buffer correctly, but initializes the
internal buffer as if there's nothing in it. As a result, the position computed
in a subsequent ftell is incorrect.

How Reproducible:

Always

Reproducer program:

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>

int main(int argc, char** argv)
{
    FILE *fp;

    setlocale(LC_ALL, "en_US.utf8");
    fp = fopen("output.txt", "w+");
    if (fp == NULL) {
        perror("fopen");
        exit(1);
    }
    if (fputws(L"abc\n", fp) == -1) {
        perror("fputws");
        exit(1);
    }
    printf("before=%d\n", ftell(fp));
    rewind (fp);
    if (fseek(fp, 0L, SEEK_END) == -1) {
        perror("fseek");
        exit(1);
    }
    printf("fseek=%d\n", ftell(fp));
    if (fputws(L"xyz\n", fp) == -1) {
        perror("fputws");
        exit(1);
    }
    printf("after=%d\n", ftell(fp));
    fclose(fp);
}

Actual result:

before=4
fseek=0
after=4

Expected Result:

before=4
fseek=4
after=8

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[Bug stdio/14543] fseek sets invalid status in the internal buffer in wide mode

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14543

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at sourceware    |siddhesh at redhat dot com
                   |dot org                     |

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[Bug stdio/14543] fseek sets invalid status in the internal buffer in wide mode

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14543

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

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[Bug stdio/14543] fseek sets invalid status in the internal buffer in wide mode

[siddhesh at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14543

Siddhesh Poyarekar <siddhesh at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #1 from Siddhesh Poyarekar <siddhesh at redhat dot com> 2012-09-28 13:30:55 UTC ---
Fixed:

http://sourceware.org/git/?p=glibc.git;a=commit;h=4573c6b09884a93fffa3a754678ef881cadebfb3

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[Bug stdio/14543] fseek sets invalid status in the internal buffer in wide mode

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14543

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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