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Siddhesh Poyarekar ae5062201d ungetc: Guarantee single char pushback 
The C standard requires that ungetc guarantees at least one pushback,
but the malloc call to allocate the pushback buffer could fail, thus
violating that requirement.  Fix this by adding a single byte pushback
buffer in the FILE struct that the pushback can fall back to if malloc
fails.

The side-effect is that if the initial malloc fails and the 1-byte
fallback buffer is used, future resizing (if it succeeds) will be
2-bytes, 4-bytes and so on, which is suboptimal but it's after a malloc
failure, so maybe even desirable.

A future optimization here could be to have the pushback code use the
single byte buffer first and only fall back to malloc for subsequent
calls.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Maciej W. Rozycki <macro@redhat.com>
 		2024-12-17 17:42:55 -05:00
..
bits ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
Depend
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Makefile libio: Fix crash in fputws [BZ #20632] 2024-10-25 15:05:06 -03:00
Versions
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__fbufsize.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__flbf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__fpending.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__fpurge.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__freadable.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__freading.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__fsetlocking.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__fwritable.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
__fwriting.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
bug-fopena+.c
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bug-fseek.c tests: replace fread by xfread 2023-06-13 19:59:08 -04:00
bug-ftell.c
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bug-memstream1.c
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bug-mmap-fflush.c tests: replace system by xsystem 2023-06-19 09:15:05 -04:00
bug-rewind.c
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bug-rewind2.c
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bug-ungetc.c
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bug-ungetc2.c
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bug-ungetc3.c
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bug-ungetc4.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
bug-ungetwc1.c
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bug-ungetwc2.c
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bug-wfflush.c
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bug-wmemstream1.c
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bug-wsetpos.c libio/bug-wsetpos: Make the error message match the causing function 2024-05-13 12:50:48 +01:00
clearerr.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
clearerr_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fcloseall.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
feof.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
feof_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ferror.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ferror_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
filedoalloc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fileno.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fileops.c ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
fmemopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fputc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fputc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fputwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fputwc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
freopen.c Fix freopen handling of ,ccs= (bug 23675) 2024-09-05 20:08:10 +00:00
freopen64.c Fix freopen handling of ,ccs= (bug 23675) 2024-09-05 20:08:10 +00:00
fseek.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fseeko.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fseeko64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ftello.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ftello64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fwide.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fwprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
fwscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
genops.c ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
getc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getchar.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getchar_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getwc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getwchar.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
getwchar_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofclose.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofdopen.c Remove memory leak in fdopen (bug 31840) 2024-06-04 14:42:06 +02:00
iofflush.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofflush_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgetpos.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgetpos64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgets.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgets_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgetws.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofgetws_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofopen64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofopncook.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofputs.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofputs_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofputws.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofputws_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofread.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofread_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofsetpos.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofsetpos64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ioftell.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofwide.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofwrite.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iofwrite_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iogetdelim.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iogetline.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iogets.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iogetwline.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iolibio.h
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iopadn.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iopopen.c Silence most -Wzero-as-null-pointer-constant diagnostics 2024-11-25 16:45:59 -03:00
ioputs.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ioseekoff.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ioseekpos.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iosetbuffer.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iosetvbuf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ioungetc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
ioungetwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iovdprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iovsprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iovsscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iovswscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
iowpadn.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
libc_fatal.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
libio-macros.sym
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libio.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
libioP.h ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
memstream.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
obprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldfileops.c ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
oldfmemopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofclose.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofdopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofgetpos.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofgetpos64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofsetpos.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiofsetpos64.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldiopopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldpclose.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
oldstdfiles.c Change _IO_stderr_/_IO_stdin_/_IO_stdout to compat symbols [BZ #31766] 2024-05-21 10:12:25 -07:00
oldtmpfile.c posix: Sync tempname with gnulib 2024-04-10 14:53:39 -03:00
pclose.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
peekc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putchar.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putchar_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putwc_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putwchar.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
putwchar_u.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
rewind.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
setbuf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
setlinebuf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
stdfiles.c Use a doubly-linked list for _IO_list_all (bug 27777) 2024-05-17 14:13:25 -07:00
stdio.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
stdio.h <stdio.h>: Acknowledge that getdelim/getline are in POSIX 2024-06-11 22:17:12 +01:00
strfile.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
strops.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
swprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
swscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
test-fmemopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
test-fputs-unbuffered-full.c libio: Fix crash in fputws [BZ #20632] 2024-10-25 15:05:06 -03:00
test-fputws-unbuffered-full.c libio: Fix crash in fputws [BZ #20632] 2024-10-25 15:05:06 -03:00
test-freopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
test-freopen.sh Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-atime.c
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tst-bz22415.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-bz24051.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-bz24153.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-bz24228.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-bz24228.map
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tst-bz28828.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-bz28828.input
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tst-cleanup-default-static.c
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tst-cleanup-default.c
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tst-cleanup-nostart-stop-gc-static.c
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tst-cleanup-nostart-stop-gc.c
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tst-cleanup-start-stop-gc-static.c
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tst-cleanup-start-stop-gc.c
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tst-cleanup.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-cleanup.exp
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tst-closeall.c libio: handle opening a file when all files are closed (bug 31963) 2024-07-09 10:12:36 +02:00
tst-eof.c
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tst-ext.c
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tst-ext2.c
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tst-fclose-unopened.c Add another test for fclose on an unopened file 2024-09-20 10:32:35 -04:00
tst-fclose-unopened2.c Add another test for fclose on an unopened file 2024-09-20 10:32:35 -04:00
tst-fclose-unopened2.input Add another test for fclose on an unopened file 2024-09-20 10:32:35 -04:00
tst-fdopen-seek-failure.c libio: Test for fdopen memory leak without SEEK_END support (bug 31840) 2024-06-04 16:09:33 +02:00
tst-fgetc-after-eof.c
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tst-fgetwc.c
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tst-fgetwc.input
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tst-fgetws.c
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tst-fopen-compat.c libio: Set _vtable_offset before calling _IO_link_in [BZ #32148] 2024-10-01 07:31:25 +08:00
tst-fopenloc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-fopenloc2.c
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tst-fputws.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-freopen.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-fseek.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-ftell-active-handler.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-ftell-append.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-ftell-partial-wide.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-fwrite-error.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-getdelim.c libio/tst-getdelim: Add new test covering NUL as a delimiter 2024-08-14 11:48:34 +02:00
tst-memstream.h Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-memstream1.c
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tst-memstream2.c
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tst-memstream3.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-memstream4.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-mmap-eofsync.c
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tst-mmap-fflushsync.c
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tst-mmap-offend.c
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tst-mmap-setvbuf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-mmap2-eofsync.c
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tst-popen-fork.c libio: Fix a deadlock after fork in popen 2024-10-23 13:40:16 +02:00
tst-popen1.c
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tst-setvbuf1.c
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tst-sprintf-chk-ub.c
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tst-sprintf-ub.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-sscanf.c
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tst-stderr-compat.c Add crt1-2.0.o for glibc 2.0 compatibility tests 2024-05-06 07:49:40 -07:00
tst-swscanf.c
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tst-ungetwc1.c
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tst-ungetwc2.c
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tst-vtables-common.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-vtables-interposed.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-vtables.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-wfile-sync.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-widetext.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-widetext.input
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tst-wmemstream1.c
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tst-wmemstream2.c
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tst-wmemstream3.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-wmemstream4.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst-wmemstream5.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst_getwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst_getwc.input
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tst_putwc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
tst_swprintf.c
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tst_swscanf.c
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tst_wprintf.c
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tst_wprintf2.c
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tst_wscanf.c
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tst_wscanf.input
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vasprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vsnprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vswprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vtables.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vwprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
vwscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wfiledoalloc.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wfileops.c ungetc: Guarantee single char pushback 2024-12-17 17:42:55 -05:00
wgenops.c Silence most -Wzero-as-null-pointer-constant diagnostics 2024-11-25 16:45:59 -03:00
wmemstream.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wprintf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wscanf.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00
wstrops.c Update copyright dates with scripts/update-copyrights 2024-01-01 10:53:40 -08:00