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util: optimize free_and_strdup() if NOP

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Under the assumption that strcmp() is cheaper than memory allocation,
let's avoid the allocation, if the new value is identical to the old.
This commit is contained in:
Lennart Poettering
2015-05-11 22:10:36 +02:00
parent 27023c0ef5
commit 4b64536ee7
1 changed files with 4 additions and 1 deletions
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src/shared/util.c
+4 -1
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@@ -5682,6 +5682,9 @@ int free_and_strdup(char **p, const char *s) {
/* Replaces a string pointer with an strdup()ed new string,
* possibly freeing the old one. */
if (streq_ptr(*p, s))
return 0;
if (s) {
t = strdup(s);
if (!t)
@@ -5692,7 +5695,7 @@ int free_and_strdup(char **p, const char *s) {
free(*p);
*p = t;
return 0;
return 1;
}
int sethostname_idempotent(const char *s) {