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 Additional Information: Posted patch upstream: http://sourceware.org/ml/libc-alpha/2012-09/msg00044.html
glibc-2.16-14.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/glibc-2.16-14.fc18
glibc-2.16-15.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/glibc-2.16-15.fc18
glibc-2.16-15.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
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Fedora 18 changed to end-of-life (EOL) status on 2014-01-14. Fedora 18 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.