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-rw-r--r--src/libbasic/alloc-util.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/src/libbasic/alloc-util.c b/src/libbasic/alloc-util.c
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+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd 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 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <stdint.h>
+#include <string.h>
+
+#include "alloc-util.h"
+#include "macro.h"
+#include "util.h"
+
+void* memdup(const void *p, size_t l) {
+ void *r;
+
+ assert(p);
+
+ r = malloc(l);
+ if (!r)
+ return NULL;
+
+ memcpy(r, p, l);
+ return r;
+}
+
+void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
+ size_t a, newalloc;
+ void *q;
+
+ assert(p);
+ assert(allocated);
+
+ if (*allocated >= need)
+ return *p;
+
+ newalloc = MAX(need * 2, 64u / size);
+ a = newalloc * size;
+
+ /* check for overflows */
+ if (a < size * need)
+ return NULL;
+
+ q = realloc(*p, a);
+ if (!q)
+ return NULL;
+
+ *p = q;
+ *allocated = newalloc;
+ return q;
+}
+
+void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
+ size_t prev;
+ uint8_t *q;
+
+ assert(p);
+ assert(allocated);
+
+ prev = *allocated;
+
+ q = greedy_realloc(p, allocated, need, size);
+ if (!q)
+ return NULL;
+
+ if (*allocated > prev)
+ memzero(q + prev * size, (*allocated - prev) * size);
+
+ return q;
+}