X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7226cbd1d978b15d4379e7f643595de35b5b3779..53272781d0b7f664fc6e3fcd5c9032dd09103bbc:/src/ziplist.c diff --git a/src/ziplist.c b/src/ziplist.c index 55bb662b..639e4b61 100644 --- a/src/ziplist.c +++ b/src/ziplist.c @@ -67,11 +67,10 @@ #include #include #include "zmalloc.h" +#include "util.h" #include "ziplist.h" #include "endian.h" -int ll2string(char *s, size_t len, long long value); - #define ZIP_END 255 #define ZIP_BIGLEN 254 @@ -252,22 +251,9 @@ static int zipPrevLenByteDiff(unsigned char *p, unsigned int len) { * Stores the integer value in 'v' and its encoding in 'encoding'. */ static int zipTryEncoding(unsigned char *entry, unsigned int entrylen, long long *v, unsigned char *encoding) { long long value; - char *eptr; - char buf[32]; if (entrylen >= 32 || entrylen == 0) return 0; - if (entry[0] == '-' || (entry[0] >= '0' && entry[0] <= '9')) { - int slen; - - /* Perform a back-and-forth conversion to make sure that - * the string turned into an integer is not losing any info. */ - memcpy(buf,entry,entrylen); - buf[entrylen] = '\0'; - value = strtoll(buf,&eptr,10); - if (eptr[0] != '\0') return 0; - slen = ll2string(buf,32,value); - if (entrylen != (unsigned)slen || memcmp(buf,entry,slen)) return 0; - + if (string2ll((char*)entry,entrylen,&value)) { /* Great, the string can be encoded. Check what's the smallest * of our encoding types that can hold this value. */ if (value >= INT16_MIN && value <= INT16_MAX) { @@ -385,8 +371,8 @@ static unsigned char *ziplistResize(unsigned char *zl, unsigned int len) { * The pointer "p" points to the first entry that does NOT need to be * updated, i.e. consecutive fields MAY need an update. */ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p) { - unsigned int curlen = ZIPLIST_BYTES(zl), rawlen, rawlensize; - unsigned int offset, noffset, extra; + size_t curlen = ZIPLIST_BYTES(zl), rawlen, rawlensize; + size_t offset, noffset, extra; unsigned char *np; zlentry cur, next; @@ -408,12 +394,17 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p offset = p-zl; extra = rawlensize-next.prevrawlensize; zl = ziplistResize(zl,curlen+extra); - ZIPLIST_TAIL_OFFSET(zl) += extra; p = zl+offset; - /* Move the tail to the back. */ + /* Current pointer and offset for next element. */ np = p+rawlen; noffset = np-zl; + + /* Update tail offset when next element is not the tail element. */ + if ((zl+ZIPLIST_TAIL_OFFSET(zl)) != np) + ZIPLIST_TAIL_OFFSET(zl) += extra; + + /* Move the tail to the back. */ memmove(np+rawlensize, np+next.prevrawlensize, curlen-noffset-next.prevrawlensize-1); @@ -441,7 +432,8 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p /* Delete "num" entries, starting at "p". Returns pointer to the ziplist. */ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsigned int num) { unsigned int i, totlen, deleted = 0; - int offset, nextdiff = 0; + size_t offset; + int nextdiff = 0; zlentry first, tail; first = zipEntry(p); @@ -493,10 +485,13 @@ static unsigned char *__ziplistDelete(unsigned char *zl, unsigned char *p, unsig /* Insert item at "p". */ static unsigned char *__ziplistInsert(unsigned char *zl, unsigned char *p, unsigned char *s, unsigned int slen) { - unsigned int curlen = ZIPLIST_BYTES(zl), reqlen, prevlen = 0; - unsigned int offset, nextdiff = 0; + size_t curlen = ZIPLIST_BYTES(zl), reqlen, prevlen = 0; + size_t offset; + int nextdiff = 0; unsigned char encoding = 0; - long long value; + long long value = 123456789; /* initialized to avoid warning. Using a value + that is easy to see if for some reason + we use it uninitialized. */ zlentry entry, tail; /* Find out prevlen for the entry that is inserted. */ @@ -678,7 +673,7 @@ unsigned char *ziplistInsert(unsigned char *zl, unsigned char *p, unsigned char * Also update *p in place, to be able to iterate over the * ziplist, while deleting entries. */ unsigned char *ziplistDelete(unsigned char *zl, unsigned char **p) { - unsigned int offset = *p-zl; + size_t offset = *p-zl; zl = __ziplistDelete(zl,*p,1); /* Store pointer to current element in p, because ziplistDelete will @@ -887,7 +882,7 @@ void pop(unsigned char *zl, int where) { } } -void randstring(char *target, unsigned int min, unsigned int max) { +int randstring(char *target, unsigned int min, unsigned int max) { int p, len = min+rand()%(max-min+1); int minval, maxval; switch(rand() % 3) { @@ -909,10 +904,9 @@ void randstring(char *target, unsigned int min, unsigned int max) { while(p < len) target[p++] = minval+rand()%(maxval-minval+1); - return; + return len; } - int main(int argc, char **argv) { unsigned char *zl, *p; unsigned char *entry; @@ -1245,6 +1239,7 @@ int main(int argc, char **argv) { int i,j,len,where; unsigned char *p; char buf[1024]; + int buflen; list *ref; listNode *refnode; @@ -1253,10 +1248,6 @@ int main(int argc, char **argv) { unsigned int slen; long long sval; - /* In the regression for the cascade bug, it was triggered - * with a random seed of 2. */ - srand(2); - for (i = 0; i < 20000; i++) { zl = ziplistNew(); ref = listCreate(); @@ -1266,31 +1257,32 @@ int main(int argc, char **argv) { /* Create lists */ for (j = 0; j < len; j++) { where = (rand() & 1) ? ZIPLIST_HEAD : ZIPLIST_TAIL; - switch(rand() % 4) { - case 0: - sprintf(buf,"%lld",(0LL + rand()) >> 20); - break; - case 1: - sprintf(buf,"%lld",(0LL + rand())); - break; - case 2: - sprintf(buf,"%lld",(0LL + rand()) << 20); - break; - case 3: - randstring(buf,0,256); - break; - default: - assert(NULL); + if (rand() % 2) { + buflen = randstring(buf,1,sizeof(buf)-1); + } else { + switch(rand() % 3) { + case 0: + buflen = sprintf(buf,"%lld",(0LL + rand()) >> 20); + break; + case 1: + buflen = sprintf(buf,"%lld",(0LL + rand())); + break; + case 2: + buflen = sprintf(buf,"%lld",(0LL + rand()) << 20); + break; + default: + assert(NULL); + } } /* Add to ziplist */ - zl = ziplistPush(zl, (unsigned char*)buf, strlen(buf), where); + zl = ziplistPush(zl, (unsigned char*)buf, buflen, where); /* Add to reference list */ if (where == ZIPLIST_HEAD) { - listAddNodeHead(ref,sdsnew(buf)); + listAddNodeHead(ref,sdsnewlen(buf, buflen)); } else if (where == ZIPLIST_TAIL) { - listAddNodeTail(ref,sdsnew(buf)); + listAddNodeTail(ref,sdsnewlen(buf, buflen)); } else { assert(NULL); } @@ -1305,12 +1297,13 @@ int main(int argc, char **argv) { assert(ziplistGet(p,&sstr,&slen,&sval)); if (sstr == NULL) { - sprintf(buf,"%lld",sval); + buflen = sprintf(buf,"%lld",sval); } else { - memcpy(buf,sstr,slen); - buf[slen] = '\0'; + buflen = slen; + memcpy(buf,sstr,buflen); + buf[buflen] = '\0'; } - assert(strcmp(buf,listNodeValue(refnode)) == 0); + assert(memcmp(buf,listNodeValue(refnode),buflen) == 0); } zfree(zl); listRelease(ref);