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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 09:59:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 09:59:15 +0000 |
commit | 8de1ee1b2b676b0d07586f0752750dd6b0fb7511 (patch) | |
tree | dd46fd7dc3863045696cd0e48032d8a36fa0daf5 /common/ccparray.c | |
parent | Initial commit. (diff) | |
download | gnupg2-upstream.tar.xz gnupg2-upstream.zip |
Adding upstream version 2.2.27.upstream/2.2.27upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'common/ccparray.c')
-rw-r--r-- | common/ccparray.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/common/ccparray.c b/common/ccparray.c new file mode 100644 index 0000000..ff3eb40 --- /dev/null +++ b/common/ccparray.c @@ -0,0 +1,148 @@ +/* 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; +} |