mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/* ccparray.c - A simple dynamic array for character pointer.
|
|
* Copyright (C) 2016 g10 Code GmbH
|
|
*
|
|
* This file is part of GnuPG.
|
|
*
|
|
* This file is free software; you can redistribute it and/or modify
|
|
* it under the terms of either
|
|
*
|
|
* - the GNU Lesser General Public License as published by the Free
|
|
* Software Foundation; either version 3 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* or
|
|
*
|
|
* - the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* or both in parallel, as here.
|
|
*
|
|
* This file is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see <https://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <stdarg.h>
|
|
|
|
#include "util.h"
|
|
#include "ccparray.h"
|
|
|
|
|
|
/* A simple implementation of a dynamic array of const char pointers.
|
|
* The example code:
|
|
*
|
|
* ccparray_t ccp;
|
|
* const char **argv;
|
|
* int i;
|
|
*
|
|
* ccparray_init (&ccp, 0);
|
|
* ccparray_put (&ccp, "First arg");
|
|
* ccparray_put (&ccp, "Second arg");
|
|
* ccparray_put (&ccp, NULL);
|
|
* ccparray_put (&ccp, "Fourth arg");
|
|
* argv = ccparray_get (&ccp, NULL);
|
|
* if (!argv)
|
|
* die ("error building array: %s\n", strerror (errno));
|
|
* for (i=0; argv[i]; i++)
|
|
* printf ("[%d] = '%s'\n", i, argv[i]);
|
|
* xfree (argv);
|
|
*
|
|
* will result in this output:
|
|
*
|
|
* [0] = 'First arg'
|
|
* [1] = 'Second arg'
|
|
*
|
|
* Note that allocation errors are detected but only returned with the
|
|
* final ccparray_get(); this helps not to clutter the code with out
|
|
* of core checks.
|
|
*/
|
|
|
|
void
|
|
ccparray_init (ccparray_t *cpa, unsigned int initialsize)
|
|
{
|
|
if (!initialsize)
|
|
cpa->size = 16;
|
|
else if (initialsize < (1<<16))
|
|
cpa->size = initialsize;
|
|
else
|
|
cpa->size = (1<<16);
|
|
|
|
cpa->count = 0;
|
|
cpa->out_of_core = 0;
|
|
cpa->array = xtrycalloc (cpa->size, sizeof *cpa->array);
|
|
if (!cpa->array)
|
|
cpa->out_of_core = errno;
|
|
}
|
|
|
|
|
|
void
|
|
ccparray_put (ccparray_t *cpa, const char *value)
|
|
{
|
|
if (cpa->out_of_core)
|
|
return;
|
|
|
|
if (cpa->count + 1 >= cpa->size)
|
|
{
|
|
const char **newarray;
|
|
size_t n, newsize;
|
|
|
|
if (cpa->size < 8)
|
|
newsize = 16;
|
|
else if (cpa->size < 4096)
|
|
newsize = 2 * cpa->size;
|
|
else if (cpa->size < (1<<16))
|
|
newsize = cpa->size + 2048;
|
|
else
|
|
{
|
|
cpa->out_of_core = ENOMEM;
|
|
return;
|
|
}
|
|
|
|
newarray = xtrycalloc (newsize, sizeof *newarray);
|
|
if (!newarray)
|
|
{
|
|
cpa->out_of_core = errno ? errno : ENOMEM;
|
|
return;
|
|
}
|
|
for (n=0; n < cpa->size; n++)
|
|
newarray[n] = cpa->array[n];
|
|
xfree (cpa->array);
|
|
cpa->array = newarray;
|
|
cpa->size = newsize;
|
|
|
|
}
|
|
cpa->array[cpa->count++] = value;
|
|
}
|
|
|
|
|
|
const char **
|
|
ccparray_get (ccparray_t *cpa, size_t *r_count)
|
|
{
|
|
const char **result;
|
|
|
|
if (cpa->out_of_core)
|
|
{
|
|
if (cpa->array)
|
|
{
|
|
xfree (cpa->array);
|
|
cpa->array = NULL;
|
|
}
|
|
gpg_err_set_errno (cpa->out_of_core);
|
|
return NULL;
|
|
}
|
|
|
|
result= cpa->array;
|
|
if (r_count)
|
|
*r_count = cpa->count;
|
|
cpa->array = NULL;
|
|
cpa->out_of_core = ENOMEM; /* hack to make sure it won't get reused. */
|
|
return result;
|
|
}
|