libc neutral random function derived from a drand48() implementation added. Will...

[redis.git] / src / sds.c

diff --git a/src/sds.c b/src/sds.c
index 63507000b106e6fefc8a8d099f1f68d9f846afe9..77052966ceb79e72355df042f400648d35131829 100644 (file)
--- a/src/sds.c
+++ b/src/sds.c
@@ -94,6 +94,13 @@ void sdsupdatelen(sds s) {
     sh->len = reallen;
 }
 
+void sdsclear(sds s) {
+    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    sh->free += sh->len;
+    sh->len = 0;
+    sh->buf[0] = '\0';
+}
+
 static sds sdsMakeRoomFor(sds s, size_t addlen) {
     struct sdshdr *sh, *newsh;
     size_t free = sdsavail(s);
@@ -553,6 +560,29 @@ void sdssplitargs_free(sds *argv, int argc) {
     zfree(argv);
 }
 
+/* Modify the string substituting all the occurrences of the set of
+ * characters specifed in the 'from' string to the corresponding character
+ * in the 'to' array.
+ *
+ * For instance: sdsmapchars(mystring, "ho", "01", 2)
+ * will have the effect of turning the string "hello" into "0ell1".
+ *
+ * The function returns the sds string pointer, that is always the same
+ * as the input pointer since no resize is needed. */
+sds sdsmapchars(sds s, char *from, char *to, size_t setlen) {
+    size_t j, i, l = sdslen(s);
+
+    for (j = 0; j < l; j++) {
+        for (i = 0; i < setlen; i++) {
+            if (s[j] == from[i]) {
+                s[j] = to[i];
+                break;
+            }
+        }
+    }
+    return s;
+}
+
 #ifdef SDS_TEST_MAIN
 #include <stdio.h>
 #include "testhelp.h"