mirror of
https://sourceware.org/git/glibc.git
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3d110c7c6e
Partially revert commits2b766585f9andde2fd463b1, which were intended to fix BZ#11741 but caused another, likely worse bug, namely that fwrite() and fputs() could, in an error path, read data beyond the end of the specified buffer, and potentially even write this data to the file. Fix BZ#11741 properly by checking the return value from _IO_padn() in stdio-common/vfprintf.c.
73 lines
2.1 KiB
C
73 lines
2.1 KiB
C
/* Copyright (C) 1993-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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#define PADSIZE 16
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static char const blanks[PADSIZE] =
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{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
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static char const zeroes[PADSIZE] =
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{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
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_IO_ssize_t
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_IO_padn (fp, pad, count)
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_IO_FILE *fp;
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int pad;
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_IO_ssize_t count;
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{
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char padbuf[PADSIZE];
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const char *padptr;
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int i;
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_IO_size_t written = 0;
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_IO_size_t w;
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if (pad == ' ')
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padptr = blanks;
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else if (pad == '0')
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padptr = zeroes;
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else
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{
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for (i = PADSIZE; --i >= 0; )
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padbuf[i] = pad;
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padptr = padbuf;
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}
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for (i = count; i >= PADSIZE; i -= PADSIZE)
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{
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w = _IO_sputn (fp, padptr, PADSIZE);
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written += w;
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if (w != PADSIZE)
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return written;
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}
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if (i > 0)
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{
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w = _IO_sputn (fp, padptr, i);
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written += w;
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}
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return written;
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}
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libc_hidden_def (_IO_padn)
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