Merge pull request #544 from dvirsky/2.6

[redis.git] / src / sds.c

diff --git a/src/sds.c b/src/sds.c
index 092a431e5b0bd4ca360bc250cd99f9b4463d37c5..ca915daf88e69c31fc54bffb24415674f7e62e00 100644 (file)
--- a/src/sds.c
+++ b/src/sds.c
@@ -111,6 +111,24 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
     return newsh->buf;
 }
 
+/* Reallocate the sds string so that it has no free space at the end. The
+ * contained string remains not altered, but next concatenation operations
+ * will require a reallocation. */
+sds sdsRemoveFreeSpace(sds s) {
+    struct sdshdr *sh;
+
+    sh = (void*) (s-(sizeof(struct sdshdr)));
+    sh = zrealloc(sh, sizeof(struct sdshdr)+sh->len+1);
+    sh->free = 0;
+    return sh->buf;
+}
+
+size_t sdsAllocSize(sds s) {
+    struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
+
+    return sizeof(*sh)+sh->len+sh->free+1;
+}
+
 /* Increment the sds length and decrements the left free space at the
  * end of the string accordingly to 'incr'. Also set the null term
  * in the new end of the string.
@@ -161,7 +179,7 @@ sds sdsgrowzero(sds s, size_t len) {
     return s;
 }
 
-sds sdscatlen(sds s, void *t, size_t len) {
+sds sdscatlen(sds s, const void *t, size_t len) {
     struct sdshdr *sh;
     size_t curlen = sdslen(s);
 
@@ -175,15 +193,15 @@ sds sdscatlen(sds s, void *t, size_t len) {
     return s;
 }
 
-sds sdscat(sds s, char *t) {
+sds sdscat(sds s, const char *t) {
     return sdscatlen(s, t, strlen(t));
 }
 
-sds sdscatsds(sds s, sds t) {
+sds sdscatsds(sds s, const sds t) {
     return sdscatlen(s, t, sdslen(t));
 }
 
-sds sdscpylen(sds s, char *t, size_t len) {
+sds sdscpylen(sds s, const char *t, size_t len) {
     struct sdshdr *sh = (void*) (s-(sizeof(struct sdshdr)));
     size_t totlen = sh->free+sh->len;
 
@@ -200,7 +218,7 @@ sds sdscpylen(sds s, char *t, size_t len) {
     return s;
 }
 
-sds sdscpy(sds s, char *t) {
+sds sdscpy(sds s, const char *t) {
     return sdscpylen(s, t, strlen(t));
 }
 
@@ -296,7 +314,7 @@ void sdstoupper(sds s) {
     for (j = 0; j < len; j++) s[j] = toupper(s[j]);
 }
 
-int sdscmp(sds s1, sds s2) {
+int sdscmp(const sds s1, const sds s2) {
     size_t l1, l2, minlen;
     int cmp;
 
@@ -324,7 +342,7 @@ int sdscmp(sds s1, sds s2) {
  * requires length arguments. sdssplit() is just the
  * same function but for zero-terminated strings.
  */
-sds *sdssplitlen(char *s, int len, char *sep, int seplen, int *count) {
+sds *sdssplitlen(const char *s, int len, const char *sep, int seplen, int *count) {
     int elements = 0, slots = 5, start = 0, j;
     sds *tokens;
 
@@ -395,7 +413,7 @@ sds sdsfromlonglong(long long value) {
     return sdsnewlen(p,32-(p-buf));
 }
 
-sds sdscatrepr(sds s, char *p, size_t len) {
+sds sdscatrepr(sds s, const char *p, size_t len) {
     s = sdscatlen(s,"\"",1);
     while(len--) {
         switch(*p) {
@@ -463,8 +481,8 @@ int hex_digit_to_int(char c) {
  * Note that sdscatrepr() is able to convert back a string into
  * a quoted string in the same format sdssplitargs() is able to parse.
  */
-sds *sdssplitargs(char *line, int *argc) {
-    char *p = line;
+sds *sdssplitargs(const char *line, int *argc) {
+    const char *p = line;
     char *current = NULL;
     char **vector = NULL;
 
@@ -586,7 +604,7 @@ void sdssplitargs_free(sds *argv, int argc) {
  *
  * 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) {
+sds sdsmapchars(sds s, const char *from, const char *to, size_t setlen) {
     size_t j, i, l = sdslen(s);
 
     for (j = 0; j < l; j++) {