typo fixed in bio.c

[redis.git] / src / ziplist.c

diff --git a/src/ziplist.c b/src/ziplist.c
index 4f44bd58c1916028bcd99ef88c5320962f8c2d33..f5f9e9a64aa3cad58c2c8c977893bd4cf5b79837 100644 (file)
--- a/src/ziplist.c
+++ b/src/ziplist.c
@@ -67,9 +67,9 @@
 #include <assert.h>
 #include <limits.h>
 #include "zmalloc.h"
 #include <assert.h>
 #include <limits.h>
 #include "zmalloc.h"

+#include "util.h"

 #include "ziplist.h"
 #include "ziplist.h"

-
-int ll2string(char *s, size_t len, long long value);
+#include "endian.h"

 
 #define ZIP_END 255
 #define ZIP_BIGLEN 254
 
 #define ZIP_END 255
 #define ZIP_BIGLEN 254


@@ -119,6 +119,7 @@ static unsigned int zipEntryEncoding(unsigned char *p) {
         return p[0] & 0xf0;
     }
     assert(NULL);
         return p[0] & 0xf0;
     }
     assert(NULL);

+    return 0;

 }
 
 /* Return bytes needed to store integer encoded by 'encoding' */
 }
 
 /* Return bytes needed to store integer encoded by 'encoding' */


@@ -129,13 +130,14 @@ static unsigned int zipIntSize(unsigned char encoding) {
     case ZIP_INT_64B: return sizeof(int64_t);
     }
     assert(NULL);
     case ZIP_INT_64B: return sizeof(int64_t);
     }
     assert(NULL);

+    return 0;

 }
 
 /* Decode the encoded length pointed by 'p'. If a pointer to 'lensize' is
  * provided, it is set to the number of bytes required to encode the length. */
 static unsigned int zipDecodeLength(unsigned char *p, unsigned int *lensize) {
     unsigned char encoding = zipEntryEncoding(p);
 }
 
 /* Decode the encoded length pointed by 'p'. If a pointer to 'lensize' is
  * provided, it is set to the number of bytes required to encode the length. */
 static unsigned int zipDecodeLength(unsigned char *p, unsigned int *lensize) {
     unsigned char encoding = zipEntryEncoding(p);

-    unsigned int len;
+    unsigned int len = 0;

 
     if (ZIP_IS_STR(encoding)) {
         switch(encoding) {
 
     if (ZIP_IS_STR(encoding)) {
         switch(encoding) {


@@ -205,6 +207,7 @@ static unsigned int zipPrevDecodeLength(unsigned char *p, unsigned int *lensize)
     } else {
         if (lensize) *lensize = 1+sizeof(len);
         memcpy(&len,p+1,sizeof(len));
     } else {
         if (lensize) *lensize = 1+sizeof(len);
         memcpy(&len,p+1,sizeof(len));

+        memrev32ifbe(&len);

     }
     return len;
 }
     }
     return len;
 }


@@ -221,6 +224,7 @@ static unsigned int zipPrevEncodeLength(unsigned char *p, unsigned int len) {
         } else {
             p[0] = ZIP_BIGLEN;
             memcpy(p+1,&len,sizeof(len));
         } else {
             p[0] = ZIP_BIGLEN;
             memcpy(p+1,&len,sizeof(len));

+            memrev32ifbe(p+1);

             return 1+sizeof(len);
         }
     }
             return 1+sizeof(len);
         }
     }


@@ -232,6 +236,7 @@ static void zipPrevEncodeLengthForceLarge(unsigned char *p, unsigned int len) {
     if (p == NULL) return;
     p[0] = ZIP_BIGLEN;
     memcpy(p+1,&len,sizeof(len));
     if (p == NULL) return;
     p[0] = ZIP_BIGLEN;
     memcpy(p+1,&len,sizeof(len));

+    memrev32ifbe(p+1);

 }
 
 /* Return the difference in number of bytes needed to store the new length
 }
 
 /* Return the difference in number of bytes needed to store the new length


@@ -246,22 +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;
  * 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 (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) {
         /* 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) {


@@ -285,12 +277,15 @@ static void zipSaveInteger(unsigned char *p, int64_t value, unsigned char encodi
     if (encoding == ZIP_INT_16B) {
         i16 = value;
         memcpy(p,&i16,sizeof(i16));
     if (encoding == ZIP_INT_16B) {
         i16 = value;
         memcpy(p,&i16,sizeof(i16));

+        memrev16ifbe(p);

     } else if (encoding == ZIP_INT_32B) {
         i32 = value;
         memcpy(p,&i32,sizeof(i32));
     } else if (encoding == ZIP_INT_32B) {
         i32 = value;
         memcpy(p,&i32,sizeof(i32));

+        memrev32ifbe(p);

     } else if (encoding == ZIP_INT_64B) {
         i64 = value;
         memcpy(p,&i64,sizeof(i64));
     } else if (encoding == ZIP_INT_64B) {
         i64 = value;
         memcpy(p,&i64,sizeof(i64));

+        memrev64ifbe(p);

     } else {
         assert(NULL);
     }
     } else {
         assert(NULL);
     }


@@ -300,15 +295,18 @@ static void zipSaveInteger(unsigned char *p, int64_t value, unsigned char encodi
 static int64_t zipLoadInteger(unsigned char *p, unsigned char encoding) {
     int16_t i16;
     int32_t i32;
 static int64_t zipLoadInteger(unsigned char *p, unsigned char encoding) {
     int16_t i16;
     int32_t i32;

-    int64_t i64, ret;
+    int64_t i64, ret = 0;

     if (encoding == ZIP_INT_16B) {
         memcpy(&i16,p,sizeof(i16));
     if (encoding == ZIP_INT_16B) {
         memcpy(&i16,p,sizeof(i16));

+        memrev16ifbe(&i16);

         ret = i16;
     } else if (encoding == ZIP_INT_32B) {
         memcpy(&i32,p,sizeof(i32));
         ret = i16;
     } else if (encoding == ZIP_INT_32B) {
         memcpy(&i32,p,sizeof(i32));

+        memrev16ifbe(&i32);

         ret = i32;
     } else if (encoding == ZIP_INT_64B) {
         memcpy(&i64,p,sizeof(i64));
         ret = i32;
     } else if (encoding == ZIP_INT_64B) {
         memcpy(&i64,p,sizeof(i64));

+        memrev16ifbe(&i64);

         ret = i64;
     } else {
         assert(NULL);
         ret = i64;
     } else {
         assert(NULL);


@@ -373,8 +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) {
  * 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;
 
     unsigned char *np;
     zlentry cur, next;
 


@@ -396,12 +394,17 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p
             offset = p-zl;
             extra = rawlensize-next.prevrawlensize;
             zl = ziplistResize(zl,curlen+extra);
             offset = p-zl;
             extra = rawlensize-next.prevrawlensize;
             zl = ziplistResize(zl,curlen+extra);

-            ZIPLIST_TAIL_OFFSET(zl) += extra;

             p = zl+offset;
 
             p = zl+offset;
 

-            /* Move the tail to the back. */
+            /* Current pointer and offset for next element. */

             np = p+rawlen;
             noffset = np-zl;
             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);
             memmove(np+rawlensize,
                 np+next.prevrawlensize,
                 curlen-noffset-next.prevrawlensize-1);


@@ -409,6 +412,7 @@ static unsigned char *__ziplistCascadeUpdate(unsigned char *zl, unsigned char *p
 
             /* Advance the cursor */
             p += rawlen;
 
             /* Advance the cursor */
             p += rawlen;

+            curlen += extra;

         } else {
             if (next.prevrawlensize > rawlensize) {
                 /* This would result in shrinking, which we want to avoid.
         } else {
             if (next.prevrawlensize > rawlensize) {
                 /* This would result in shrinking, which we want to avoid.


@@ -428,7 +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;
 /* 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);
     zlentry first, tail;
 
     first = zipEntry(p);


@@ -480,8 +485,9 @@ 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) {
 
 /* 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;
     zlentry entry, tail;
     unsigned char encoding = 0;
     long long value;
     zlentry entry, tail;


@@ -594,7 +600,12 @@ unsigned char *ziplistIndex(unsigned char *zl, int index) {
     return (p[0] == ZIP_END || index > 0) ? NULL : p;
 }
 
     return (p[0] == ZIP_END || index > 0) ? NULL : p;
 }
 

-/* Return pointer to next entry in ziplist. */
+/* Return pointer to next entry in ziplist.
+ *
+ * zl is the pointer to the ziplist
+ * p is the pointer to the current element
+ *
+ * The element after 'p' is returned, otherwise NULL if we are at the end. */

 unsigned char *ziplistNext(unsigned char *zl, unsigned char *p) {
     ((void) zl);
 
 unsigned char *ziplistNext(unsigned char *zl, unsigned char *p) {
     ((void) zl);
 


@@ -660,7 +671,7 @@ 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) {
  * 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
     zl = __ziplistDelete(zl,*p,1);
 
     /* Store pointer to current element in p, because ziplistDelete will


@@ -722,8 +733,8 @@ unsigned int ziplistLen(unsigned char *zl) {
     return len;
 }
 
     return len;
 }
 

-/* Return size in bytes of ziplist. */
-unsigned int ziplistSize(unsigned char *zl) {
+/* Return ziplist blob size in bytes. */
+size_t ziplistBlobLen(unsigned char *zl) {

     return ZIPLIST_BYTES(zl);
 }
 
     return ZIPLIST_BYTES(zl);
 }
 


@@ -753,9 +764,9 @@ void ziplistRepr(unsigned char *zl) {
                 "pls: %2u, "
                 "payload %5u"
             "} ",
                 "pls: %2u, "
                 "payload %5u"
             "} ",

-            (long unsigned int)p,
+            (long unsigned)p,

             index,
             index,

-            p-zl,
+            (unsigned long) (p-zl),

             entry.headersize+entry.len,
             entry.headersize,
             entry.prevrawlen,
             entry.headersize+entry.len,
             entry.headersize,
             entry.prevrawlen,


@@ -764,10 +775,11 @@ void ziplistRepr(unsigned char *zl) {
         p += entry.headersize;
         if (ZIP_IS_STR(entry.encoding)) {
             if (entry.len > 40) {
         p += entry.headersize;
         if (ZIP_IS_STR(entry.encoding)) {
             if (entry.len > 40) {

-                fwrite(p,40,1,stdout);
+                if (fwrite(p,40,1,stdout) == 0) perror("fwrite");

                 printf("...");
             } else {
                 printf("...");
             } else {

-                fwrite(p,entry.len,1,stdout);
+                if (entry.len &&
+                    fwrite(p,entry.len,1,stdout) == 0) perror("fwrite");

             }
         } else {
             printf("%lld", (long long) zipLoadInteger(p,entry.encoding));
             }
         } else {
             printf("%lld", (long long) zipLoadInteger(p,entry.encoding));


@@ -781,6 +793,10 @@ void ziplistRepr(unsigned char *zl) {
 
 #ifdef ZIPLIST_TEST_MAIN
 #include <sys/time.h>
 
 #ifdef ZIPLIST_TEST_MAIN
 #include <sys/time.h>

+#include "adlist.h"
+#include "sds.h"
+
+#define debug(f, ...) { if (DEBUG) printf(f, __VA_ARGS__); }

 
 unsigned char *createList() {
     unsigned char *zl = ziplistNew();
 
 unsigned char *createList() {
     unsigned char *zl = ziplistNew();


@@ -852,7 +868,7 @@ void pop(unsigned char *zl, int where) {
             printf("Pop tail: ");
 
         if (vstr)
             printf("Pop tail: ");
 
         if (vstr)

-            fwrite(vstr,vlen,1,stdout);
+            if (vlen && fwrite(vstr,vlen,1,stdout) == 0) perror("fwrite");

         else
             printf("%lld", vlong);
 
         else
             printf("%lld", vlong);
 


@@ -864,6 +880,31 @@ void pop(unsigned char *zl, int where) {
     }
 }
 
     }
 }
 

+int randstring(char *target, unsigned int min, unsigned int max) {
+    int p, len = min+rand()%(max-min+1);
+    int minval, maxval;
+    switch(rand() % 3) {
+    case 0:
+        minval = 0;
+        maxval = 255;
+    break;
+    case 1:
+        minval = 48;
+        maxval = 122;
+    break;
+    case 2:
+        minval = 48;
+        maxval = 52;
+    break;
+    default:
+        assert(NULL);
+    }
+
+    while(p < len)
+        target[p++] = minval+rand()%(maxval-minval+1);
+    return len;
+}
+

 int main(int argc, char **argv) {
     unsigned char *zl, *p;
     unsigned char *entry;
 int main(int argc, char **argv) {
     unsigned char *zl, *p;
     unsigned char *entry;


@@ -901,7 +942,7 @@ int main(int argc, char **argv) {
             return 1;
         }
         if (entry) {
             return 1;
         }
         if (entry) {

-            fwrite(entry,elen,1,stdout);
+            if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             printf("\n");
         } else {
             printf("%lld\n", value);
             printf("\n");
         } else {
             printf("%lld\n", value);


@@ -931,7 +972,7 @@ int main(int argc, char **argv) {
             return 1;
         }
         if (entry) {
             return 1;
         }
         if (entry) {

-            fwrite(entry,elen,1,stdout);
+            if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             printf("\n");
         } else {
             printf("%lld\n", value);
             printf("\n");
         } else {
             printf("%lld\n", value);


@@ -948,7 +989,7 @@ int main(int argc, char **argv) {
             return 1;
         }
         if (entry) {
             return 1;
         }
         if (entry) {

-            fwrite(entry,elen,1,stdout);
+            if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             printf("\n");
         } else {
             printf("%lld\n", value);
             printf("\n");
         } else {
             printf("%lld\n", value);


@@ -976,7 +1017,7 @@ int main(int argc, char **argv) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {

-                fwrite(entry,elen,1,stdout);
+                if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             } else {
                 printf("%lld", value);
             }
             } else {
                 printf("%lld", value);
             }


@@ -993,7 +1034,7 @@ int main(int argc, char **argv) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {

-                fwrite(entry,elen,1,stdout);
+                if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             } else {
                 printf("%lld", value);
             }
             } else {
                 printf("%lld", value);
             }


@@ -1010,7 +1051,7 @@ int main(int argc, char **argv) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {

-                fwrite(entry,elen,1,stdout);
+                if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             } else {
                 printf("%lld", value);
             }
             } else {
                 printf("%lld", value);
             }


@@ -1039,7 +1080,7 @@ int main(int argc, char **argv) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {

-                fwrite(entry,elen,1,stdout);
+                if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             } else {
                 printf("%lld", value);
             }
             } else {
                 printf("%lld", value);
             }


@@ -1056,7 +1097,7 @@ int main(int argc, char **argv) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {
         while (ziplistGet(p, &entry, &elen, &value)) {
             printf("Entry: ");
             if (entry) {

-                fwrite(entry,elen,1,stdout);
+                if (elen && fwrite(entry,elen,1,stdout) == 0) perror("fwrite");

             } else {
                 printf("%lld", value);
             }
             } else {
                 printf("%lld", value);
             }


@@ -1113,7 +1154,8 @@ int main(int argc, char **argv) {
             } else {
                 printf("Entry: ");
                 if (entry) {
             } else {
                 printf("Entry: ");
                 if (entry) {

-                    fwrite(entry,elen,1,stdout);
+                    if (elen && fwrite(entry,elen,1,stdout) == 0)
+                        perror("fwrite");

                 } else {
                     printf("%lld",value);
                 }
                 } else {
                     printf("%lld",value);
                 }


@@ -1137,10 +1179,10 @@ int main(int argc, char **argv) {
         /* Pop values again and compare their value. */
         p = ziplistIndex(zl,0);
         assert(ziplistGet(p,&entry,&elen,&value));
         /* Pop values again and compare their value. */
         p = ziplistIndex(zl,0);
         assert(ziplistGet(p,&entry,&elen,&value));

-        assert(strncmp(v1,entry,elen) == 0);
+        assert(strncmp(v1,(char*)entry,elen) == 0);

         p = ziplistIndex(zl,1);
         assert(ziplistGet(p,&entry,&elen,&value));
         p = ziplistIndex(zl,1);
         assert(ziplistGet(p,&entry,&elen,&value));

-        assert(strncmp(v2,entry,elen) == 0);
+        assert(strncmp(v2,(char*)entry,elen) == 0);

         printf("SUCCESS\n\n");
     }
 
         printf("SUCCESS\n\n");
     }
 


@@ -1192,50 +1234,77 @@ int main(int argc, char **argv) {
 
     printf("Stress with random payloads of different encoding:\n");
     {
 
     printf("Stress with random payloads of different encoding:\n");
     {

-        int i, idx, where, len;
-        long long v;
+        int i,j,len,where;

         unsigned char *p;
         unsigned char *p;

-        char buf[0x4041]; /* max length of generated string */
-        zl = ziplistNew();
-        for (i = 0; i < 100000; i++) {
-            where = (rand() & 1) ? ZIPLIST_HEAD : ZIPLIST_TAIL;
-            if (rand() & 1) {
-                /* equally likely create a 16, 32 or 64 bit int */
-                v = (rand() & INT16_MAX) + ((1ll << 32) >> ((rand() % 3)*16));
-                v *= 2*(rand() & 1)-1; /* randomly flip sign */
-                sprintf(buf, "%lld", v);
-                zl = ziplistPush(zl, (unsigned char*)buf, strlen(buf), where);
-            } else {
-                /* equally likely generate 6, 14 or >14 bit length */
-                v = rand() & 0x3f;
-                v += 0x4000 >> ((rand() % 3)*8);
-                memset(buf, 'x', v);
-                zl = ziplistPush(zl, (unsigned char*)buf, v, where);
-            }
+        char buf[1024];
+        int buflen;
+        list *ref;
+        listNode *refnode;
+
+        /* Hold temp vars from ziplist */
+        unsigned char *sstr;
+        unsigned int slen;
+        long long sval;
+
+        for (i = 0; i < 20000; i++) {
+            zl = ziplistNew();
+            ref = listCreate();
+            listSetFreeMethod(ref,sdsfree);
+            len = rand() % 256;
+
+            /* Create lists */
+            for (j = 0; j < len; j++) {
+                where = (rand() & 1) ? ZIPLIST_HEAD : ZIPLIST_TAIL;
+                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);
+                    }
+                }

 
 

-            /* delete a random element */
-            if ((len = ziplistLen(zl)) >= 10) {
-                idx = rand() % len;
-                // printf("Delete index %d\n", idx);
-                // ziplistRepr(zl);
-                ziplistDeleteRange(zl, idx, 1);
-                // ziplistRepr(zl);
-                len--;
+                /* Add to ziplist */
+                zl = ziplistPush(zl, (unsigned char*)buf, buflen, where);
+
+                /* Add to reference list */
+                if (where == ZIPLIST_HEAD) {
+                    listAddNodeHead(ref,sdsnewlen(buf, buflen));
+                } else if (where == ZIPLIST_TAIL) {
+                    listAddNodeTail(ref,sdsnewlen(buf, buflen));
+                } else {
+                    assert(NULL);
+                }

             }
 
             }
 

-            /* iterate from front to back */
-            idx = 0;
-            p = ziplistIndex(zl, 0);
-            while((p = ziplistNext(zl,p)))
-                idx++;
-            assert(len == idx+1);
-
-            /* iterate from back to front */
-            idx = 0;
-            p = ziplistIndex(zl, -1);
-            while((p = ziplistPrev(zl,p)))
-                idx++;
-            assert(len == idx+1);
+            assert(listLength(ref) == ziplistLen(zl));
+            for (j = 0; j < len; j++) {
+                /* Naive way to get elements, but similar to the stresser
+                 * executed from the Tcl test suite. */
+                p = ziplistIndex(zl,j);
+                refnode = listIndex(ref,j);
+
+                assert(ziplistGet(p,&sstr,&slen,&sval));
+                if (sstr == NULL) {
+                    buflen = sprintf(buf,"%lld",sval);
+                } else {
+                    buflen = slen;
+                    memcpy(buf,sstr,buflen);
+                    buf[buflen] = '\0';
+                }
+                assert(memcmp(buf,listNodeValue(refnode),buflen) == 0);
+            }
+            zfree(zl);
+            listRelease(ref);

         }
         printf("SUCCESS\n\n");
     }
         }
         printf("SUCCESS\n\n");
     }