2 files changed, 16 insertions, 16 deletions

diff --git a/src/sds.c b/src/sds.c
index 1fdee37..d844b59 100644
--- a/src/sds.c
+++ b/src/sds.c
@@ -82,7 +82,7 @@ sds sdsdup(const sds s) {
 /* Free an sds string. No operation is performed if 's' is NULL. */
 void sdsfree(sds s) {
     if (s == NULL) return;
-    free(s-sizeof(struct sdshdr));
+    free(sdsheader(s));
 }
 
 /* Set the sds string length to the length as obtained with strlen(), so
@@ -100,7 +100,7 @@ void sdsfree(sds s) {
  * the output will be "6" as the string was modified but the logical length
  * remains 6 bytes. */
 void sdsupdatelen(sds s) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     int reallen = strlen(s);
     sh->free += (sh->len-reallen);
     sh->len = reallen;
@@ -111,7 +111,7 @@ void sdsupdatelen(sds s) {
  * so that next append operations will not require allocations up to the
  * number of bytes previously available. */
 void sdsclear(sds s) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     sh->free += sh->len;
     sh->len = 0;
     sh->buf[0] = '\0';
@@ -130,7 +130,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
 
     if (free >= addlen) return s;
     len = sdslen(s);
-    sh = (void*) (s-(sizeof(struct sdshdr)));
+    sh = sdsheader(s);
     newlen = (len+addlen);
     if (newlen < SDS_MAX_PREALLOC)
         newlen *= 2;
@@ -152,7 +152,7 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
 sds sdsRemoveFreeSpace(sds s) {
     struct sdshdr *sh;
 
-    sh = (void*) (s-(sizeof(struct sdshdr)));
+    sh = sdsheader(s);
     sh = realloc(sh, sizeof(struct sdshdr)+sh->len+1);
     sh->free = 0;
     return sh->buf;
@@ -166,7 +166,7 @@ sds sdsRemoveFreeSpace(sds s) {
  * 4) The implicit null term.
  */
 size_t sdsAllocSize(sds s) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
 
     return sizeof(*sh)+sh->len+sh->free+1;
 }
@@ -195,7 +195,7 @@ size_t sdsAllocSize(sds s) {
  * sdsIncrLen(s, nread);
  */
 void sdsIncrLen(sds s, int incr) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
 
     assert(sh->free >= incr);
     sh->len += incr;
@@ -210,7 +210,7 @@ void sdsIncrLen(sds s, int incr) {
  * if the specified length is smaller than the current length, no operation
  * is performed. */
 sds sdsgrowzero(sds s, size_t len) {
-    struct sdshdr *sh = (void*)(s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     size_t totlen, curlen = sh->len;
 
     if (len <= curlen) return s;
@@ -218,7 +218,7 @@ sds sdsgrowzero(sds s, size_t len) {
     if (s == NULL) return NULL;
 
     /* Make sure added region doesn't contain garbage */
-    sh = (void*)(s-(sizeof(struct sdshdr)));
+    sh = sdsheader(s);
     memset(s+curlen,0,(len-curlen+1)); /* also set trailing \0 byte */
     totlen = sh->len+sh->free;
     sh->len = len;
@@ -237,7 +237,7 @@ sds sdscatlen(sds s, const void *t, size_t len) {
 
     s = sdsMakeRoomFor(s,len);
     if (s == NULL) return NULL;
-    sh = (void*) (s-(sizeof(struct sdshdr)));
+    sh = sdsheader(s);
     memcpy(s+curlen, t, len);
     sh->len = curlen+len;
     sh->free = sh->free-len;
@@ -264,13 +264,13 @@ sds sdscatsds(sds s, const sds t) {
 /* Destructively modify the sds string 's' to hold the specified binary
  * safe string pointed by 't' of length 'len' bytes. */
 sds sdscpylen(sds s, const char *t, size_t len) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     size_t totlen = sh->free+sh->len;
 
     if (totlen < len) {
         s = sdsMakeRoomFor(s,len-sh->len);
         if (s == NULL) return NULL;
-        sh = (void*) (s-(sizeof(struct sdshdr)));
+        sh = sdsheader(s);
         totlen = sh->free+sh->len;
     }
     memcpy(s, t, len);
@@ -350,7 +350,7 @@ sds sdscatprintf(sds s, const char *fmt, ...) {
  * Output will be just "Hello World".
  */
 void sdstrim(sds s, const char *cset) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     char *start, *end, *sp, *ep;
     size_t len;
 
@@ -382,7 +382,7 @@ void sdstrim(sds s, const char *cset) {
  * sdsrange(s,1,-1); => "ello World"
  */
 void sdsrange(sds s, int start, int end) {
-    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+    struct sdshdr *sh = sdsheader(s);
     size_t newlen, len = sdslen(s);
 
     if (len == 0) return;
diff --git a/src/sds.h b/src/sds.h
index ac99b80..4c7ae5f 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -46,12 +46,12 @@ static inline struct sdshdr * sdsheader(const sds s) {
 }
 
 static inline size_t sdslen(const sds s) {
-    struct sdshdr *sh = s - (sizeof (struct sdshdr));
+    struct sdshdr *sh = sdsheader(s);
     return sh->len;
 }
 
 static inline size_t sdsavail(const sds s) {
-    struct sdshdr *sh = s - (sizeof (struct sdshdr));
+    struct sdshdr *sh = sdsheader(s);
     return sh->free;
 }