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* find/defs.h: Update copyright year. * find/find.c: Update copyright year. * find/finddata.c: Update copyright year. * find/ftsfind.c: Update copyright year. * find/parser.c: Update copyright year. * find/pred.c: Update copyright year. * find/sharefile.c: Update copyright year. * find/sharefile.h: Update copyright year. * find/tree.c: Update copyright year. * find/util.c: Update copyright year. * lib/buildcmd.c: Update copyright year. * lib/buildcmd.h: Update copyright year. * lib/dircallback.c: Update copyright year. * lib/dircallback.h: Update copyright year. * lib/extendbuf.c: Update copyright year. * lib/extendbuf.h: Update copyright year. * lib/fdleak.c: Update copyright year. * lib/fdleak.h: Update copyright year. * lib/findutils-version.c: Update copyright year. * lib/findutils-version.h: Update copyright year. * lib/forcefindlib.c: Update copyright year. * lib/listfile.c: Update copyright year. * lib/listfile.h: Update copyright year. * lib/nextelem.c: Update copyright year. * lib/nextelem.h: Update copyright year. * lib/printquoted.c: Update copyright year. * lib/printquoted.h: Update copyright year. * lib/qmark.c: Update copyright year. * lib/regexprops.c: Update copyright year. (copying): Update copyright year in the output file, too. * lib/regextype.c: Update copyright year. * lib/regextype.h: Update copyright year. * lib/safe-atoi.c: Update copyright year. * lib/safe-atoi.h: Update copyright year. * lib/savedirinfo.c: Update copyright year. * lib/savedirinfo.h: Update copyright year. * lib/unused-result.h: Update copyright year. * lib/waitpid.c: Update copyright year. * locate/bigram.c: Update copyright year. * locate/code.c: Update copyright year. * locate/frcode.c: Update copyright year. * locate/locate.c: Update copyright year. * locate/locatedb.h: Update copyright year. * locate/word_io.c: Update copyright year. * xargs/xargs.c: Update copyright year.
120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/* extendbuf.c -- manage a dynamically-allocated buffer
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Copyright 2004, 2010, 2011 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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return wanted;
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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 = malloc (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 = realloc (existing, newsize);
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if (NULL == result)
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{
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saved_errno = errno;
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}
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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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/* malloc () or realloc () 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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void *
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xextendbuf (void* existing, size_t wanted, size_t *allocated)
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{
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void *p = extendbuf (existing, wanted, allocated);
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if (NULL == p)
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{
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free (existing);
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xalloc_die ();
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}
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return p;
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}
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