Add a strreplace function to stdlib.

src/std/c_string.c

@@ -120,3 +120,26 @@ void c_strlist_destroy(c_strlist_t *strlist) {
   SAFE_FREE(strlist);
 }
 
+char *c_strreplace(char *src, const char *pattern, const char *repl) {
+  char *p = NULL;
+
+  while ((p = strstr(src, pattern)) != NULL) {
+     size_t of = p - src;
+     size_t l  = strlen(src);
+     size_t pl = strlen(pattern);
+     size_t rl = strlen(repl);
+
+     if (rl > pl) {
+        src = (char *) c_realloc(src, strlen(src) + rl - pl + 1);
+     }
+
+     if (rl != pl) {
+        memmove(src + of + rl, src + of + pl, l - of - pl + 1);
+     }
+
+     strncpy(src + of, repl, rl);
+  }
+
+  return src;
+}
+

src/std/c_string.h

@@ -105,6 +105,19 @@ int c_strlist_add(c_strlist_t *strlist, const char *string);
  */
 void c_strlist_destroy(c_strlist_t *strlist);
 
+/**
+ * @breif Replace a string with another string in a source string.
+ *
+ * @param src      String to search for pattern.
+ *
+ * @param pattern  Pattern to search for in the source string.
+ *
+ * @param repl     The string which which should replace pattern if found.
+ *
+ * @return  Return a pointer to the source string.
+ */
+char *c_strreplace(char *src, const char *pattern, const char *repl);
+
 /**
  * }@
  */

tests/std_tests/check_std_c_str.c

@@ -96,12 +96,24 @@ START_TEST (check_c_strlist_expand)
 }
 END_TEST
 
+START_TEST (check_c_strreplace)
+{
+  char *str = c_strdup("/home/%(USER)");
+
+  str = c_strreplace(str, "%(USER)", "csync");
+  fail_unless(strcmp(str, "/home/csync") == 0, NULL);
+
+  SAFE_FREE(str);
+}
+END_TEST
+
 static Suite *make_std_c_strlist_suite(void) {
   Suite *s = suite_create("std:str:c_stringlist");
 
   create_case(s, "check_c_strlist_new", check_c_strlist_new);
   create_case(s, "check_c_strlist_add", check_c_strlist_add);
   create_case(s, "check_c_strlist_expand", check_c_strlist_expand);
+  create_case(s, "check_c_strreplace", check_c_strreplace);
 
   return s;
 }