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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:14:06 +0000
commiteee068778cb28ecf3c14e1bf843a95547d72c42d (patch)
tree0e07b30ddc5ea579d682d5dbe57998200d1c9ab7 /common/xasprintf.c
parentInitial commit. (diff)
downloadgnupg2-upstream/2.2.40.tar.xz
gnupg2-upstream/2.2.40.zip
Adding upstream version 2.2.40.upstream/2.2.40upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--common/xasprintf.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/common/xasprintf.c b/common/xasprintf.c
new file mode 100644
index 0000000..7e37e5b
--- /dev/null
+++ b/common/xasprintf.c
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+/* xasprintf.c
+ * Copyright (C) 2003, 2005 Free Software Foundation, Inc.
+ * Copyright (C) 2020 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 "util.h"
+
+/* Same as asprintf but return an allocated buffer suitable to be
+ freed using xfree. This function simply dies on memory failure,
+ thus no extra check is required.
+
+ FIXME: We should remove these functions in favor of gpgrt_bsprintf
+ and a xgpgrt_bsprintf or rename them to xbsprintf and
+ xtrybsprintf. */
+char *
+xasprintf (const char *fmt, ...)
+{
+ va_list ap;
+ char *buf;
+
+ va_start (ap, fmt);
+ if (gpgrt_vasprintf (&buf, fmt, ap) < 0)
+ log_fatal ("estream_asprintf failed: %s\n", strerror (errno));
+ va_end (ap);
+ return buf;
+}
+
+/* Same as above but return NULL on memory failure. */
+char *
+xtryasprintf (const char *fmt, ...)
+{
+ int rc;
+ va_list ap;
+ char *buf;
+
+ va_start (ap, fmt);
+ rc = gpgrt_vasprintf (&buf, fmt, ap);
+ va_end (ap);
+ if (rc < 0)
+ return NULL;
+ return buf;
+}
+
+
+/* This is safe version of realloc useful for reallocing a calloced
+ * array. There are two ways to call it: The first example
+ * reallocates the array A to N elements each of SIZE but does not
+ * clear the newly allocated elements:
+ *
+ * p = xtryreallocarray (a, n, n, nsize);
+ *
+ * Note that when NOLD is larger than N no cleaning is needed anyway.
+ * The second example reallocates an array of size NOLD to N elements
+ * each of SIZE but clear the newly allocated elements:
+ *
+ * p = xtryreallocarray (a, nold, n, nsize);
+ *
+ * Note that xtryreallocarray (NULL, 0, n, nsize) is equivalent to
+ * xtrycalloc (n, nsize).
+ *
+ * The same function under the name gpgrt_reallocarray exists in
+ * libgpg-error but only since version 1.38 and thus we use a copy
+ * here.
+ */
+void *
+xtryreallocarray (void *a, size_t oldnmemb, size_t nmemb, size_t size)
+{
+ size_t oldbytes, bytes;
+ char *p;
+
+ bytes = nmemb * size; /* size_t is unsigned so the behavior on overflow
+ * is defined. */
+ if (size && bytes / size != nmemb)
+ {
+ gpg_err_set_errno (ENOMEM);
+ return NULL;
+ }
+
+ p = xtryrealloc (a, bytes);
+ if (p && oldnmemb < nmemb)
+ {
+ /* OLDNMEMBS is lower than NMEMB thus the user asked for a
+ calloc. Clear all newly allocated members. */
+ oldbytes = oldnmemb * size;
+ if (size && oldbytes / size != oldnmemb)
+ {
+ xfree (p);
+ gpg_err_set_errno (ENOMEM);
+ return NULL;
+ }
+ memset (p + oldbytes, 0, bytes - oldbytes);
+ }
+ return p;
+}