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change iteration code to avoid allocating a new sds for each traversed entry

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This commit is contained in:
Pieter Noordhuis 2010-05-21 13:29:14 +02:00
parent 08253bf42b
commit 335d16bc0f
1 changed files with 19 additions and 13 deletions
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32
ziplist.c
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@ -120,12 +120,11 @@ unsigned char *ziplistIndex(unsigned char *zl, unsigned int index) {
/* Store entry at current position in sds *value and return pointer
* to the next entry. */
unsigned char *ziplistNext(unsigned char *p, sds *value) {
unsigned char *ziplistNext(unsigned char *p, unsigned char **entry, unsigned int *elen) {
if (*p == ZIP_END) return NULL;
if (value) {
unsigned int len;
len = zipDecodeLength(p);
*value = sdsnewlen(p+zipEncodeLength(NULL,len),len);
if (entry) {
*elen = zipDecodeLength(p);
*entry = p+ZIP_LEN_BYTES(*elen);
}
p += zipRawEntryLength(p);
return p;
@ -159,7 +158,8 @@ unsigned char *createList() {
}
int main(int argc, char **argv) {
unsigned char *zl, *p;
unsigned char *zl, *p, *entry;
unsigned int elen;
sds s;
zl = createList();
@ -177,8 +177,10 @@ int main(int argc, char **argv) {
{
zl = createList();
p = ziplistIndex(zl, 0);
while ((p = ziplistNext(p, &s)) != NULL) {
printf("Entry: %s (length %ld)\n", s, sdslen(s));
while ((p = ziplistNext(p, &entry, &elen)) != NULL) {
printf("Entry: ");
fwrite(entry,elen,1,stdout);
printf(" (length %d)\n", elen);
}
printf("\n");
}
@ -187,8 +189,10 @@ int main(int argc, char **argv) {
{
zl = createList();
p = ziplistIndex(zl, 1);
while ((p = ziplistNext(p, &s)) != NULL) {
printf("Entry: %s (length %ld)\n", s, sdslen(s));
while ((p = ziplistNext(p, &entry, &elen)) != NULL) {
printf("Entry: ");
fwrite(entry,elen,1,stdout);
printf(" (length %d)\n", elen);
}
printf("\n");
}
@ -197,8 +201,10 @@ int main(int argc, char **argv) {
{
zl = createList();
p = ziplistIndex(zl, 2);
while ((p = ziplistNext(p, &s)) != NULL) {
printf("Entry: %s (length %ld)\n", s, sdslen(s));
while ((p = ziplistNext(p, &entry, &elen)) != NULL) {
printf("Entry: ");
fwrite(entry,elen,1,stdout);
printf(" (length %d)\n", elen);
}
printf("\n");
}
@ -207,7 +213,7 @@ int main(int argc, char **argv) {
{
zl = createList();
p = ziplistIndex(zl, 3);
if (ziplistNext(p, &s) == NULL) {
if (ziplistNext(p, &entry, &elen) == NULL) {
printf("No entry\n");
} else {
printf("ERROR\n");