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Shamil Abdulaev ad66f46380 libio: Use __wunderflow in _IO_getwline_info 
After a buffer refill, _IO_getwline_info reads the first character
through __wuflow and handles it on a separate path from the rest of
the buffer.  When extract_delim is negative, that path calls
_IO_sputbackc, the narrow-stream putback, on a wide stream, so it
would operate on fp->_IO_read_ptr instead of
fp->_wide_data->_IO_read_ptr.  No current caller passes a negative
extract_delim, so this is not reachable today.

Refill the buffer with __wunderflow instead, which does not consume
anything, and let the wmemchr path handle every character including
the delimiter.  This removes the duplicated delimiter handling and
the wrong putback.  Every wide underflow implementation either
returns WEOF or leaves at least one character in the buffer, so the
loop cannot spin.

No functional change for fgetws and fgetws_unlocked.  Tested with the
libio tests on x86_64-linux-gnu, including tst-fgetws and tst-widetext.

Signed-off-by: Shamil Abdulaev <ashamil435@gmail.com>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2026-10-07 07:43:12 -03:00
..
bits
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__fbufsize.c
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__flbf.c
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__fpending.c
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__fpurge.c
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__freadable.c
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__freading.c
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__fsetlocking.c
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__fwritable.c
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__fwriting.c
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2026-01-01 13:42:29 -08:00
bug-fmemopen.c
libio: Fix fmemopen_write on appending mode (BZ 34006)
2026-05-18 13:31:00 -03:00
bug-fopena+.c
Update.
2002-08-27 06:41:29 +00:00
bug-fseek.c
tests: replace fread by xfread
2023-06-13 19:59:08 -04:00
bug-ftell.c
* libio/bug-ftell.c (do_test): Add a cast.
2003-11-01 21:11:05 +00:00
bug-memstream1.c
Add missing header files throughout the testsuite.
2017-02-16 17:33:18 -05:00
bug-mmap-fflush.c
tests: replace system by xsystem
2023-06-19 09:15:05 -04:00
bug-rewind2.c
Fix warnings in fwscanf / rewind tests.
2014-11-26 12:54:39 +00:00
bug-rewind.c
Fix warnings in fwscanf / rewind tests.
2014-11-26 12:54:39 +00:00
bug-ungetc2.c
Update.
2003-09-06 09:56:14 +00:00
bug-ungetc3.c
tests: replace write by xwrite
2023-06-01 12:40:05 -04:00
bug-ungetc4.c
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2026-01-01 13:42:29 -08:00
bug-ungetc.c
tests: replace write by xwrite
2023-06-01 12:40:05 -04:00
bug-ungetwc1.c
Fix libio/bug-ungetwc1.c warning.
2014-11-27 16:01:04 +00:00
bug-ungetwc2.c
Update.
2002-04-24 21:09:14 +00:00
bug-wfflush.c
tests: replace write by xwrite
2023-06-01 12:40:05 -04:00
bug-wgenops-bz33998.c
Drop "(C) YYYY" from DCO'd contributions.
2026-05-07 10:41:36 -04:00
bug-wmemstream1.c
Add missing header files throughout the testsuite.
2017-02-16 17:33:18 -05:00
bug-wsetpos.c
libio/bug-wsetpos: Make the error message match the causing function
2024-05-13 12:50:48 +01:00
clearerr_u.c
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clearerr.c
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Depend
New file, libio needs localedata for tests.
2000-07-29 07:57:34 +00:00
fcloseall.c
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feof_u.c
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feof.c
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ferror_u.c
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ferror.c
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filedoalloc.c
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fileno.c
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2026-01-01 13:42:29 -08:00
fileops.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
fmemopen.c
libio: Fix fmemopen_write on appending mode (BZ 34006)
2026-05-18 13:31:00 -03:00
fputc_u.c
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fputc.c
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fputwc_u.c
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fputwc.c
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2026-01-01 13:42:29 -08:00
freopen64.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
freopen.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
fseek.c
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fseeko64.c
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fseeko.c
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ftello64.c
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ftello.c
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fwide.c
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fwprintf.c
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fwscanf.c
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genops.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
getc_u.c
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getc.c
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getchar_u.c
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getchar.c
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getwc_u.c
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getwc.c
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getwchar_u.c
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getwchar.c
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2026-01-01 13:42:29 -08:00
iofclose.c
libio: Fix wide stream backup buffer leak on fclose [BZ #33999]
2026-04-07 13:20:55 -03:00
iofdopen.c
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iofflush_u.c
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iofflush.c
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iofgetpos64.c
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iofgetpos.c
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iofgets_u.c
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iofgets.c
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iofgetws_u.c
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iofgetws.c
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iofopen64.c
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iofopen.c
libio: validate the wide vtable via a bounds-checked index
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iofopncook.c
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iofputs_u.c
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iofputs.c
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iofputws_u.c
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iofputws.c
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iofread_u.c
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iofread.c
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iofsetpos64.c
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iofsetpos.c
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ioftell.c
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iofwide.c
libio: validate the wide vtable via a bounds-checked index
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iofwrite_u.c
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iofwrite.c
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iogetdelim.c
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iogetline.c
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iogets.c
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2026-01-01 13:42:29 -08:00
iogetwline.c
libio: Use __wunderflow in _IO_getwline_info
2026-10-07 07:43:12 -03:00
iolibio.h
libio: Eliminate _IO_stdin, _IO_stdout, _IO_stderr
2019-02-18 16:37:00 +01:00
iopadn.c
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iopopen.c
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ioputs.c
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ioseekoff.c
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ioseekpos.c
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iosetbuffer.c
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iosetvbuf.c
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ioungetc.c
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ioungetwc.c
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iovdprintf.c
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iovsprintf.c
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iovsscanf.c
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iovswscanf.c
libio: Fix gconv module reference counter overflow in swscanf
2026-05-12 11:09:34 +02:00
iowpadn.c
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libc_fatal.c
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libio-macros.sym
libio: Remove the usage of __libc_IO_vtables
2023-03-27 13:57:55 -03:00
libio.h
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
libioP.h
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
Makefile
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
memstream.c
libio: Ignore doallocate for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:19 -03:00
obprintf.c
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oldfileops.c
libio: Fix race in _IO_new_file_init_internal initialization order [BZ #33785]
2026-05-13 07:52:40 +02:00
oldfmemopen.c
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oldiofclose.c
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oldiofdopen.c
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oldiofgetpos64.c
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oldiofgetpos.c
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oldiofopen.c
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oldiofsetpos64.c
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oldiofsetpos.c
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oldiopopen.c
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oldpclose.c
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oldstdfiles.c
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oldtmpfile.c
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pclose.c
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peekc.c
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putc_u.c
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putc.c
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putchar_u.c
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putchar.c
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putwc_u.c
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putwc.c
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putwchar_u.c
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putwchar.c
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rewind.c
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setbuf.c
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setlinebuf.c
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stdfiles.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
stdio.c
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stdio.h
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strfile.h
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strops.c
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swprintf.c
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swscanf.c
libio: Fix gconv module reference counter overflow in swscanf
2026-05-12 11:09:34 +02:00
test-fmemopen.c
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test-fputs-unbuffered-full.c
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test-fputws-unbuffered-full.c
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test-freopen.c
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test-freopen.sh
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tst_getwc.c
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tst_getwc.input
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2000-06-23 06:22:36 +00:00
tst_putwc.c
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tst_swprintf.c
libio: Convert __vswprintf_internal to buffers (bug 27857)
2022-12-19 18:56:55 +01:00
tst_swscanf.c
Use '%z' instead of '%Z' on printf functions
2022-09-22 08:48:04 -03:00
tst_wprintf2.c
Remove "Contributed by" lines
2021-09-03 22:06:44 +05:30
tst_wprintf.c
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2000-06-17 19:22:43 +00:00
tst_wscanf.c
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2001-02-09 17:57:28 +00:00
tst_wscanf.input
…
tst-asprintf-null.c
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tst-atime.c
Don't reduce test timeout to less than default
2018-10-17 09:34:13 +02:00
tst-bz22415.c
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tst-bz24051.c
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tst-bz24153.c
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tst-bz24228.c
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tst-bz24228.map
libio: do not attempt to free wide buffers of legacy streams [BZ #24228]
2019-06-20 17:32:07 +00:00
tst-bz28828.c
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tst-bz28828.input
libio: Ensure output buffer for wchars (bug #28828)
2022-03-08 14:25:32 -03:00
tst-cleanup-default-static.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup-default.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup-nostart-stop-gc-static.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup-nostart-stop-gc.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup-start-stop-gc-static.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup-start-stop-gc.c
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-cleanup.c
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tst-cleanup.exp
Set the retain attribute on _elf_set_element if CC supports [BZ #27492]
2021-04-16 11:26:39 -07:00
tst-closeall.c
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2026-01-01 13:42:29 -08:00
tst-eof.c
pdate.
2002-07-23 00:31:41 +00:00
tst-ext2.c
* libio/Makefile (tests): Add tst-ext2.
2007-10-13 07:33:09 +00:00
tst-ext.c
Use '%z' instead of '%Z' on printf functions
2022-09-22 08:48:04 -03:00
tst-fclose-unopened2.c
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tst-fclose-unopened2.input
Add another test for fclose on an unopened file
2024-09-20 10:32:35 -04:00
tst-fclose-unopened.c
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2026-01-01 13:42:29 -08:00
tst-fdopen-seek-failure.c
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tst-fflush-NULL.c
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tst-fflush-skeleton.c
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tst-fflush.c
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2026-01-01 13:42:29 -08:00
tst-fgetc-after-eof.c
[BZ 1190] Make EOF sticky in stdio.
2018-03-13 08:31:56 -04:00
tst-fgetwc.c
(do_test): Use de_DE.UTF-8 as locale name.
2009-06-15 17:27:48 -07:00
tst-fgetwc.input
2009-02-04 Ulrich Drepper <drepper@redhat.com>
2009-02-04 21:27:48 +00:00
tst-fgetws.c
Fix format strings.
2002-09-30 07:47:16 +00:00
tst-file-init-race.c
libio: Fix race in _IO_new_file_init_internal initialization order [BZ #33785]
2026-05-13 07:52:40 +02:00
tst-fopen-ccs-empty.c
libio: Add test for fopen with an empty ", ccs=" value [BZ #34574]
2026-09-04 14:52:22 +02:00
tst-fopen-compat.c
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tst-fopenloc2.c
[BZ #2173]
2006-01-19 01:35:28 +00:00
tst-fopenloc.c
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tst-fputws.c
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tst-freopen.c
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tst-fseek.c
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tst-ftell-active-handler.c
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2026-01-01 13:42:29 -08:00
tst-ftell-append.c
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2026-01-01 13:42:29 -08:00
tst-ftell-partial-wide.c
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2026-01-01 13:42:29 -08:00
tst-fwrite-error.c
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2026-01-01 13:42:29 -08:00
tst-getdelim.c
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2026-01-01 13:42:29 -08:00
tst-memstream1.c
Add missing header files throughout the testsuite.
2017-02-16 17:33:18 -05:00
tst-memstream2.c
Add missing header files throughout the testsuite.
2017-02-16 17:33:18 -05:00
tst-memstream3.c
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2026-01-01 13:42:29 -08:00
tst-memstream4.c
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2026-01-01 13:42:29 -08:00
tst-memstream-setbuf.c
libio: Ignore setbuf for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:15 -03:00
tst-memstream-setvbuf-doallocate.c
libio: Ignore doallocate for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:19 -03:00
tst-memstream.h
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tst-mmap2-eofsync.c
2016-06-11 Paul Pluzhnikov <ppluzhnikov@google.com>
2016-06-11 14:50:16 -07:00
tst-mmap-eofsync.c
Remove miscellaneous debris from libio.
2018-02-21 14:39:54 -05:00
tst-mmap-fflushsync.c
* locale/xlocale.h (struct __locale_struct): New member `__names'.
2002-08-30 10:36:44 +00:00
tst-mmap-offend.c
* locale/xlocale.h (struct __locale_struct): New member `__names'.
2002-08-30 10:36:44 +00:00
tst-mmap-setvbuf.c
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2026-01-01 13:42:29 -08:00
tst-popen1.c
Enable support for GCC 11 -Wmismatched-dealloc.
2021-05-16 15:21:18 -06:00
tst-popen-fork.c
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2026-01-01 13:42:29 -08:00
tst-setvbuf1.c
Fix all the remaining misspellings -- BZ 25337
2023-06-02 01:39:48 +00:00
tst-sprintf-chk-ub.c
Set behavior of sprintf-like functions with overlapping source and destination
2019-01-02 13:53:52 -02:00
tst-sprintf-ub.c
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2026-01-01 13:42:29 -08:00
tst-sscanf.c
Modify several tests to use test-skeleton.c
2014-11-05 15:24:08 +05:30
tst-stderr-compat.c
Use __attribute_optimization_barrier__ for the remaining noclone users
2026-08-28 09:43:42 -03:00
tst-stdio-static.c
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2026-01-01 13:42:29 -08:00
tst-swscanf.c
Update.
2002-02-26 18:08:08 +00:00
tst-ungetwc1.c
Modify several tests to use test-skeleton.c
2014-11-05 15:24:08 +05:30
tst-ungetwc2.c
Modify several tests to use test-skeleton.c
2014-11-05 15:24:08 +05:30
tst-vtables-common.c
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2026-01-01 13:42:29 -08:00
tst-vtables-interposed.c
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2026-01-01 13:42:29 -08:00
tst-vtables.c
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2026-01-01 13:42:29 -08:00
tst-wbackup-leak.c
libio: Fix wide stream backup buffer leak on fclose [BZ #33999]
2026-04-07 13:20:55 -03:00
tst-wfile-sync.c
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2026-01-01 13:42:29 -08:00
tst-wfiledoallocate-static.c
libio: Properly link in function _IO_wfile_doallocate in static binaries
2026-03-10 13:24:17 -03:00
tst-wide-vtable-check.c
libio: validate the wide vtable via a bounds-checked index
2026-09-16 08:41:01 -03:00
tst-widetext.c
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2026-01-01 13:42:29 -08:00
tst-widetext.input
Finish change from “Bengali” to “Bangla”
2017-09-09 12:41:54 +02:00
tst-wmemstream1.c
Enable support for GCC 11 -Wmismatched-dealloc.
2021-05-16 15:21:18 -06:00
tst-wmemstream2.c
* posix/glob.c (glob_in_dir): Add some comments and asserts to
2006-09-30 15:09:35 +00:00
tst-wmemstream3.c
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2026-01-01 13:42:29 -08:00
tst-wmemstream4.c
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tst-wmemstream5.c
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2026-01-01 13:42:29 -08:00
tst-wmemstream-setbuf.c
libio: Ignore setbuf for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:15 -03:00
tst-wmemstream-setvbuf-doallocate.c
libio: Ignore doallocate for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:19 -03:00
vasprintf.c
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2026-01-01 13:42:29 -08:00
Versions
Add missing symbols to Version files
2021-06-02 07:32:19 +02:00
vscanf.c
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vsnprintf.c
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2026-01-01 13:42:29 -08:00
vswprintf.c
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2026-01-01 13:42:29 -08:00
vtables.c
libio: Ignore doallocate for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:19 -03:00
vwprintf.c
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vwscanf.c
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wfiledoalloc.c
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2026-01-01 13:42:29 -08:00
wfileops.c
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2026-01-01 13:42:29 -08:00
wgenops.c
libio: use _IO_have_wbackup for wide streams
2026-06-08 17:01:15 +02:00
wmemstream.c
libio: Ignore doallocate for open_memstream and open_wmemstream [BZ #34019]
2026-05-20 17:22:19 -03:00
wprintf.c
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wscanf.c
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2026-01-01 13:42:29 -08:00
wstrops.c
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2026-01-01 13:42:29 -08:00