sdsrange() does not need to return a value.

Actaully the string is modified in-place and a reallocation is never
needed, so there is no need to return the new sds string pointer as
return value of the function, that is now just "void".

src/cluster.c

@@ -1153,7 +1153,7 @@ void clusterWriteHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
         handleLinkIOError(link);
         return;
     }
-    link->sndbuf = sdsrange(link->sndbuf,nwritten,-1);
+    sdsrange(link->sndbuf,nwritten,-1);
     if (sdslen(link->sndbuf) == 0)
         aeDeleteFileEvent(server.el, link->fd, AE_WRITABLE);
 }

src/networking.c

@@ -866,7 +866,7 @@ int processInlineBuffer(redisClient *c) {
     sdsfree(aux);
 
     /* Leave data after the first line of the query in the buffer */
-    c->querybuf = sdsrange(c->querybuf,querylen+2,-1);
+    sdsrange(c->querybuf,querylen+2,-1);
 
     /* Setup argv array on client structure */
     if (c->argv) zfree(c->argv);
@@ -895,7 +895,7 @@ static void setProtocolError(redisClient *c, int pos) {
         sdsfree(client);
     }
     c->flags |= REDIS_CLOSE_AFTER_REPLY;
-    c->querybuf = sdsrange(c->querybuf,pos,-1);
+    sdsrange(c->querybuf,pos,-1);
 }
 
 int processMultibulkBuffer(redisClient *c) {
@@ -933,7 +933,7 @@ int processMultibulkBuffer(redisClient *c) {
 
         pos = (newline-c->querybuf)+2;
         if (ll <= 0) {
-            c->querybuf = sdsrange(c->querybuf,pos,-1);
+            sdsrange(c->querybuf,pos,-1);
             return REDIS_OK;
         }
 
@@ -982,7 +982,7 @@ int processMultibulkBuffer(redisClient *c) {
                  * try to make it likely that it will start at c->querybuf
                  * boundary so that we can optimized object creation
                  * avoiding a large copy of data. */
-                c->querybuf = sdsrange(c->querybuf,pos,-1);
+                sdsrange(c->querybuf,pos,-1);
                 pos = 0;
                 /* Hint the sds library about the amount of bytes this string is
                  * going to contain. */
@@ -1021,7 +1021,7 @@ int processMultibulkBuffer(redisClient *c) {
     }
 
     /* Trim to pos */
-    if (pos) c->querybuf = sdsrange(c->querybuf,pos,-1);
+    if (pos) sdsrange(c->querybuf,pos,-1);
 
     /* We're done when c->multibulk == 0 */
     if (c->multibulklen == 0) return REDIS_OK;

src/sds.c

@@ -385,11 +385,11 @@ sds sdstrim(sds s, const char *cset) {
  * s = sdsnew("Hello World");
  * sdstrim(s,1,-1); => "ello Worl"
  */
-sds sdsrange(sds s, int start, int end) {
+void sdsrange(sds s, int start, int end) {
     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
     size_t newlen, len = sdslen(s);
 
-    if (len == 0) return s;
+    if (len == 0) return;
     if (start < 0) {
         start = len+start;
         if (start < 0) start = 0;
@@ -413,7 +413,6 @@ sds sdsrange(sds s, int start, int end) {
     sh->buf[newlen] = 0;
     sh->free = sh->free+(sh->len-newlen);
     sh->len = newlen;
-    return s;
 }
 
 /* Apply tolower() to every character of the sds string 's'. */

src/sds.h

@@ -77,7 +77,7 @@ sds sdscatprintf(sds s, const char *fmt, ...);
 #endif
 
 sds sdstrim(sds s, const char *cset);
-sds sdsrange(sds s, int start, int end);
+void sdsrange(sds s, int start, int end);
 void sdsupdatelen(sds s);
 void sdsclear(sds s);
 int sdscmp(const sds s1, const sds s2);

src/sentinel.c

@@ -1920,7 +1920,7 @@ void addReplySentinelRedisInstance(redisClient *c, sentinelRedisInstance *ri) {
     if (ri->flags & SRI_RECONF_DONE) flags = sdscat(flags,"reconf_done,");
     if (ri->flags & SRI_DEMOTE) flags = sdscat(flags,"demote,");
 
-    if (sdslen(flags) != 0) flags = sdsrange(flags,0,-2); /* remove last "," */
+    if (sdslen(flags) != 0) sdsrange(flags,0,-2); /* remove last "," */
     addReplyBulkCString(c,flags);
     sdsfree(flags);
     fields++;