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5dce9f443c
Removed trailing whitespace. * Makefile.am: Removed trailing white space. * NEWS, build-aux/check-testfiles.sh, build-aux/src-sniff.py, doc/Makefile.am, doc/find-maint.texi, doc/find.texi, find/Makefile.am, find/defs.h, find/find.1, find/find.c, find/finddata.c, find/fstype.c, find/ftsfind.c, find/parser.c, find/pred.c, find/tree.c, find/util.c, import-gnulib.sh, lib/Makefile.am, lib/buildcmd.c, lib/buildcmd.h, lib/dircallback.c, lib/dircallback.h, lib/extendbuf.c, lib/extendbuf.h, lib/findutils-version.c, lib/findutils-version.h, lib/forcefindlib.c, lib/gnulib-version.h, lib/listfile.c, lib/modetype.h, lib/nextelem.c, lib/nextelem.h, lib/printquoted.c, lib/printquoted.h, lib/qmark.c, lib/regexprops.c, lib/regextype.c, lib/savedirinfo.c, lib/savedirinfo.h, lib/strspn.c, lib/wait.h, lib/waitpid.c, locate/bigram.c, locate/code.c, locate/locate.1, locate/locate.c, locate/locatedb.5, locate/locatedb.h, locate/updatedb.1, locate/updatedb.sh, locate/word_io.c, m4/findlib.m4, m4/nullsort.m4, m4/withfts.m4, xargs/xargs.1: Likewise. Signed-off-by: James Youngman <jay@gnu.org>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/* extendbuf.c -- manage a dynamically-allocated buffer
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Copyright 2004 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Written by James Yougnman <jay@gnu.org>. */
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#include <config.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include "xalloc.h"
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#include "extendbuf.h"
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/* We initially use a small default size to ensure that this code
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* gets exercised.
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*/
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#ifndef SIZE_DEFAULT
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# define SIZE_DEFAULT 16
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#endif
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static size_t
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decide_size(size_t current, size_t wanted)
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{
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size_t newsize;
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if (0 == current)
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newsize = SIZE_DEFAULT;
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else
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newsize = current;
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while (newsize < wanted)
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{
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if (2 * newsize < newsize)
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xalloc_die ();
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newsize *= 2;
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}
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return newsize;
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}
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void *
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extendbuf(void* existing, size_t wanted, size_t *allocated)
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{
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int saved_errno;
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size_t newsize;
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void *result; /* leave uninitialised to allow static code checkers to identify bugs */
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saved_errno = errno;
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assert (wanted > 0u);
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newsize = decide_size(*allocated, wanted);
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if ( (*allocated) == 0 )
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{
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/* Sanity check: If there is no existing allocation size, there
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* must be no existing allocated buffer.
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*/
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assert (NULL == existing);
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(*allocated) = newsize;
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result = xmalloc(newsize);
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}
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else
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{
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if (newsize != (*allocated) )
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{
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(*allocated) = newsize;
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result = xrealloc (existing, newsize);
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}
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else
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{
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result = existing;
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}
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}
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if (result)
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{
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/* xmalloc() or xrealloc() may have changed errno, but in the
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success case we want to preserve the previous value.
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*/
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errno = saved_errno;
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}
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return result;
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}
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