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

__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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bug-fopena+.c

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bug-fseek.c

tests: replace fread by xfread

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bug-ftell.c

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bug-memstream1.c

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bug-mmap-fflush.c

tests: replace system by xsystem

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bug-rewind2.c

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bug-rewind.c

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bug-ungetc2.c

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bug-ungetc3.c

tests: replace write by xwrite

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bug-ungetc4.c

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bug-ungetc.c

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bug-ungetwc1.c

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bug-ungetwc2.c

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bug-wfflush.c

tests: replace write by xwrite

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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

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clearerr_u.c

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clearerr.c

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Depend

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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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fileops.c

ungetc: Guarantee single char pushback

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fmemopen.c

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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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freopen64.c

Fix freopen handling of ,ccs= (bug 23675)

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freopen.c

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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

ungetc: Guarantee single char pushback

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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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iofclose.c

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iofdopen.c

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iofflush_u.c

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iofgetws.c

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iofopen64.c

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iofputs.c

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iofread_u.c

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iofread.c

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iofsetpos64.c

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ioftell.c

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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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iogetwline.c

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iolibio.h

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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

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iowpadn.c

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libc_fatal.c

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libio-macros.sym

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libio.h

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libioP.h

ungetc: Guarantee single char pushback

2024-12-17 17:42:55 -05:00

Makefile

libio: Fix crash in fputws [BZ #20632]

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memstream.c

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obprintf.c

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oldfileops.c

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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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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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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

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stdio.c

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stdio.h

<stdio.h>: Acknowledge that getdelim/getline are in POSIX

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strfile.h

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strops.c

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swprintf.c

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swscanf.c

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test-fmemopen.c

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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]

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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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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

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tst_wprintf2.c

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tst_wprintf.c

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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.c

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tst-cleanup-start-stop-gc.c

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tst-cleanup.c

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tst-cleanup.exp

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tst-closeall.c

libio: handle opening a file when all files are closed (bug 31963)

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tst-eof.c

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tst-ext2.c

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tst-ext.c

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tst-fclose-unopened2.c

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tst-fclose-unopened2.input

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tst-fclose-unopened.c

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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-fopen-compat.c

libio: Set _vtable_offset before calling _IO_link_in [BZ #32148]

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tst-getdelim.c

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tst-memstream1.c

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tst-mmap2-eofsync.c

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tst-popen1.c

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tst-popen-fork.c

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tst-setvbuf1.c

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tst-sprintf-chk-ub.c

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tst-sscanf.c

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Versions

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vscanf.c

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wfileops.c

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wgenops.c

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wmemstream.c

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wprintf.c

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wscanf.c

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wstrops.c

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