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-rw-r--r--libmailutils/alloc.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/libmailutils/alloc.c b/libmailutils/alloc.c
new file mode 100644
index 000000000..05801bb1a
--- /dev/null
+++ b/libmailutils/alloc.c
@@ -0,0 +1,116 @@
+/* Error-proof memory allocation functions.
+ Copyright (C) 2008, 2010 Free Software Foundation, Inc.
+
+ This library is free software; you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ This library 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 Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <mailutils/error.h>
+#include <mailutils/nls.h>
+#include <mailutils/alloc.h>
+
+void (*mu_alloc_die_hook) (void) = NULL;
+
+void
+mu_alloc_die ()
+{
+ if (mu_alloc_die_hook)
+ mu_alloc_die_hook ();
+ mu_error (_("Not enough memory"));
+ abort ();
+}
+
+void *
+mu_alloc (size_t size)
+{
+ void *p = malloc (size);
+ if (!p)
+ mu_alloc_die ();
+ return p;
+}
+
+void *
+mu_calloc (size_t nmemb, size_t size)
+{
+ void *p = calloc (nmemb, size);
+ if (!p)
+ mu_alloc_die ();
+ return p;
+}
+
+void *
+mu_zalloc (size_t size)
+{
+ void *p = mu_alloc (size);
+ memset (p, 0, size);
+ return p;
+}
+
+void *
+mu_realloc (void *p, size_t size)
+{
+ void *newp = realloc (p, size);
+ if (!newp)
+ mu_alloc_die ();
+ return newp;
+}
+
+char *
+mu_strdup (const char *s)
+{
+ char *news = strdup (s);
+ if (!news)
+ mu_alloc_die ();
+ return news;
+}
+
+/* Copied from gnulib */
+void *
+mu_2nrealloc (void *p, size_t *pn, size_t s)
+{
+ size_t n = *pn;
+
+ if (!p)
+ {
+ if (!n)
+ {
+ /* The approximate size to use for initial small allocation
+ requests, when the invoking code specifies an old size of
+ zero. 64 bytes is the largest "small" request for the
+ GNU C library malloc. */
+ enum { DEFAULT_MXFAST = 64 };
+
+ n = DEFAULT_MXFAST / s;
+ n += !n;
+ }
+ }
+ else
+ {
+ /* Set N = ceil (1.5 * N) so that progress is made if N == 1.
+ Check for overflow, so that N * S stays in size_t range.
+ The check is slightly conservative, but an exact check isn't
+ worth the trouble. */
+ if ((size_t) -1 / 3 * 2 / s <= n)
+ mu_alloc_die ();
+ n += (n + 1) / 2;
+ }
+
+ *pn = n;
+ return mu_realloc (p, n * s);
+}
+

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