[redis.git] / src / object.c

#include "redis.h"
#include <pthread.h>

robj *createObject(int type, void *ptr) {
    robj *o;

    if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
    if (listLength(server.objfreelist)) {
        listNode *head = listFirst(server.objfreelist);
        o = listNodeValue(head);
        listDelNode(server.objfreelist,head);
        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
    } else {
        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
        o = zmalloc(sizeof(*o));
    }
    o->type = type;
    o->encoding = REDIS_ENCODING_RAW;
    o->ptr = ptr;
    o->refcount = 1;
    if (server.vm_enabled) {
        /* Note that this code may run in the context of an I/O thread
         * and accessing server.lruclock in theory is an error
         * (no locks). But in practice this is safe, and even if we read
         * garbage Redis will not fail. */
        o->lru = server.lruclock;
        o->storage = REDIS_VM_MEMORY;
    }
    return o;
}

robj *createStringObject(char *ptr, size_t len) {
    return createObject(REDIS_STRING,sdsnewlen(ptr,len));
}

robj *createStringObjectFromLongLong(long long value) {
    robj *o;
    if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
        incrRefCount(shared.integers[value]);
        o = shared.integers[value];
    } else {
        if (value >= LONG_MIN && value <= LONG_MAX) {
            o = createObject(REDIS_STRING, NULL);
            o->encoding = REDIS_ENCODING_INT;
            o->ptr = (void*)((long)value);
        } else {
            o = createObject(REDIS_STRING,sdsfromlonglong(value));
        }
    }
    return o;
}

robj *dupStringObject(robj *o) {
    redisAssert(o->encoding == REDIS_ENCODING_RAW);
    return createStringObject(o->ptr,sdslen(o->ptr));
}

robj *createListObject(void) {
    list *l = listCreate();
    robj *o = createObject(REDIS_LIST,l);
    listSetFreeMethod(l,decrRefCount);
    o->encoding = REDIS_ENCODING_LINKEDLIST;
    return o;
}

robj *createZiplistObject(void) {
    unsigned char *zl = ziplistNew();
    robj *o = createObject(REDIS_LIST,zl);
    o->encoding = REDIS_ENCODING_ZIPLIST;
    return o;
}

robj *createSetObject(void) {
    dict *d = dictCreate(&setDictType,NULL);
    return createObject(REDIS_SET,d);
}

robj *createHashObject(void) {
    /* All the Hashes start as zipmaps. Will be automatically converted
     * into hash tables if there are enough elements or big elements
     * inside. */
    unsigned char *zm = zipmapNew();
    robj *o = createObject(REDIS_HASH,zm);
    o->encoding = REDIS_ENCODING_ZIPMAP;
    return o;
}

robj *createZsetObject(void) {
    zset *zs = zmalloc(sizeof(*zs));

    zs->dict = dictCreate(&zsetDictType,NULL);
    zs->zsl = zslCreate();
    return createObject(REDIS_ZSET,zs);
}

void freeStringObject(robj *o) {
    if (o->encoding == REDIS_ENCODING_RAW) {
        sdsfree(o->ptr);
    }
}

void freeListObject(robj *o) {
    switch (o->encoding) {
    case REDIS_ENCODING_LINKEDLIST:
        listRelease((list*) o->ptr);
        break;
    case REDIS_ENCODING_ZIPLIST:
        zfree(o->ptr);
        break;
    default:
        redisPanic("Unknown list encoding type");
    }
}

void freeSetObject(robj *o) {
    dictRelease((dict*) o->ptr);
}

void freeZsetObject(robj *o) {
    zset *zs = o->ptr;

    dictRelease(zs->dict);
    zslFree(zs->zsl);
    zfree(zs);
}

void freeHashObject(robj *o) {
    switch (o->encoding) {
    case REDIS_ENCODING_HT:
        dictRelease((dict*) o->ptr);
        break;
    case REDIS_ENCODING_ZIPMAP:
        zfree(o->ptr);
        break;
    default:
        redisPanic("Unknown hash encoding type");
        break;
    }
}

void incrRefCount(robj *o) {
    o->refcount++;
}

void decrRefCount(void *obj) {
    robj *o = obj;

    /* Object is a swapped out value, or in the process of being loaded. */
    if (server.vm_enabled &&
        (o->storage == REDIS_VM_SWAPPED || o->storage == REDIS_VM_LOADING))
    {
        vmpointer *vp = obj;
        if (o->storage == REDIS_VM_LOADING) vmCancelThreadedIOJob(o);
        vmMarkPagesFree(vp->page,vp->usedpages);
        server.vm_stats_swapped_objects--;
        zfree(vp);
        return;
    }

    if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
    /* Object is in memory, or in the process of being swapped out.
     *
     * If the object is being swapped out, abort the operation on
     * decrRefCount even if the refcount does not drop to 0: the object
     * is referenced at least two times, as value of the key AND as
     * job->val in the iojob. So if we don't invalidate the iojob, when it is
     * done but the relevant key was removed in the meantime, the
     * complete jobs handler will not find the key about the job and the
     * assert will fail. */
    if (server.vm_enabled && o->storage == REDIS_VM_SWAPPING)
        vmCancelThreadedIOJob(o);
    if (--(o->refcount) == 0) {
        switch(o->type) {
        case REDIS_STRING: freeStringObject(o); break;
        case REDIS_LIST: freeListObject(o); break;
        case REDIS_SET: freeSetObject(o); break;
        case REDIS_ZSET: freeZsetObject(o); break;
        case REDIS_HASH: freeHashObject(o); break;
        default: redisPanic("Unknown object type"); break;
        }
        if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
        if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
            !listAddNodeHead(server.objfreelist,o))
            zfree(o);
        if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
    }
}

int checkType(redisClient *c, robj *o, int type) {
    if (o->type != type) {
        addReply(c,shared.wrongtypeerr);
        return 1;
    }
    return 0;
}

/* Try to encode a string object in order to save space */
robj *tryObjectEncoding(robj *o) {
    long value;
    sds s = o->ptr;

    if (o->encoding != REDIS_ENCODING_RAW)
        return o; /* Already encoded */

    /* It's not safe to encode shared objects: shared objects can be shared
     * everywhere in the "object space" of Redis. Encoded objects can only
     * appear as "values" (and not, for instance, as keys) */
     if (o->refcount > 1) return o;

    /* Currently we try to encode only strings */
    redisAssert(o->type == REDIS_STRING);

    /* Check if we can represent this string as a long integer */
    if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;

    /* Ok, this object can be encoded...
     *
     * Can I use a shared object? Only if the object is inside a given
     * range and if this is the main thread, since when VM is enabled we
     * have the constraint that I/O thread should only handle non-shared
     * objects, in order to avoid race conditions (we don't have per-object
     * locking). */
    if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
        pthread_equal(pthread_self(),server.mainthread)) {
        decrRefCount(o);
        incrRefCount(shared.integers[value]);
        return shared.integers[value];
    } else {
        o->encoding = REDIS_ENCODING_INT;
        sdsfree(o->ptr);
        o->ptr = (void*) value;
        return o;
    }
}

/* Get a decoded version of an encoded object (returned as a new object).
 * If the object is already raw-encoded just increment the ref count. */
robj *getDecodedObject(robj *o) {
    robj *dec;

    if (o->encoding == REDIS_ENCODING_RAW) {
        incrRefCount(o);
        return o;
    }
    if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
        char buf[32];

        ll2string(buf,32,(long)o->ptr);
        dec = createStringObject(buf,strlen(buf));
        return dec;
    } else {
        redisPanic("Unknown encoding type");
    }
}

/* Compare two string objects via strcmp() or alike.
 * Note that the objects may be integer-encoded. In such a case we
 * use ll2string() to get a string representation of the numbers on the stack
 * and compare the strings, it's much faster than calling getDecodedObject().
 *
 * Important note: if objects are not integer encoded, but binary-safe strings,
 * sdscmp() from sds.c will apply memcmp() so this function ca be considered
 * binary safe. */
int compareStringObjects(robj *a, robj *b) {
    redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
    char bufa[128], bufb[128], *astr, *bstr;
    int bothsds = 1;

    if (a == b) return 0;
    if (a->encoding != REDIS_ENCODING_RAW) {
        ll2string(bufa,sizeof(bufa),(long) a->ptr);
        astr = bufa;
        bothsds = 0;
    } else {
        astr = a->ptr;
    }
    if (b->encoding != REDIS_ENCODING_RAW) {
        ll2string(bufb,sizeof(bufb),(long) b->ptr);
        bstr = bufb;
        bothsds = 0;
    } else {
        bstr = b->ptr;
    }
    return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
}

/* Equal string objects return 1 if the two objects are the same from the
 * point of view of a string comparison, otherwise 0 is returned. Note that
 * this function is faster then checking for (compareStringObject(a,b) == 0)
 * because it can perform some more optimization. */
int equalStringObjects(robj *a, robj *b) {
    if (a->encoding != REDIS_ENCODING_RAW && b->encoding != REDIS_ENCODING_RAW){
        return a->ptr == b->ptr;
    } else {
        return compareStringObjects(a,b) == 0;
    }
}

size_t stringObjectLen(robj *o) {
    redisAssert(o->type == REDIS_STRING);
    if (o->encoding == REDIS_ENCODING_RAW) {
        return sdslen(o->ptr);
    } else {
        char buf[32];

        return ll2string(buf,32,(long)o->ptr);
    }
}

int getDoubleFromObject(robj *o, double *target) {
    double value;
    char *eptr;

    if (o == NULL) {
        value = 0;
    } else {
        redisAssert(o->type == REDIS_STRING);
        if (o->encoding == REDIS_ENCODING_RAW) {
            value = strtod(o->ptr, &eptr);
            if (eptr[0] != '\0') return REDIS_ERR;
        } else if (o->encoding == REDIS_ENCODING_INT) {
            value = (long)o->ptr;
        } else {
            redisPanic("Unknown string encoding");
        }
    }

    *target = value;
    return REDIS_OK;
}

int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg) {
    double value;
    if (getDoubleFromObject(o, &value) != REDIS_OK) {
        if (msg != NULL) {
            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
        } else {
            addReplySds(c, sdsnew("-ERR value is not a double\r\n"));
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

int getLongLongFromObject(robj *o, long long *target) {
    long long value;
    char *eptr;

    if (o == NULL) {
        value = 0;
    } else {
        redisAssert(o->type == REDIS_STRING);
        if (o->encoding == REDIS_ENCODING_RAW) {
            value = strtoll(o->ptr, &eptr, 10);
            if (eptr[0] != '\0') return REDIS_ERR;
        } else if (o->encoding == REDIS_ENCODING_INT) {
            value = (long)o->ptr;
        } else {
            redisPanic("Unknown string encoding");
        }
    }

    *target = value;
    return REDIS_OK;
}

int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg) {
    long long value;
    if (getLongLongFromObject(o, &value) != REDIS_OK) {
        if (msg != NULL) {
            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
        } else {
            addReplySds(c, sdsnew("-ERR value is not an integer\r\n"));
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg) {
    long long value;

    if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
    if (value < LONG_MIN || value > LONG_MAX) {
        if (msg != NULL) {
            addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
        } else {
            addReplySds(c, sdsnew("-ERR value is out of range\r\n"));
        }
        return REDIS_ERR;
    }

    *target = value;
    return REDIS_OK;
}

char *strEncoding(int encoding) {
    switch(encoding) {
    case REDIS_ENCODING_RAW: return "raw";
    case REDIS_ENCODING_INT: return "int";
    case REDIS_ENCODING_HT: return "hashtable";
    case REDIS_ENCODING_ZIPMAP: return "zipmap";
    case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
    case REDIS_ENCODING_ZIPLIST: return "ziplist";
    default: return "unknown";
    }
}
Commit	Line	Data
e2641e09	1	#include "redis.h"
	2	#include <pthread.h>
	3
	4	robj createObject(int type, void ptr) {
	5	robj *o;
	6
	7	if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
	8	if (listLength(server.objfreelist)) {
	9	listNode *head = listFirst(server.objfreelist);
	10	o = listNodeValue(head);
	11	listDelNode(server.objfreelist,head);
	12	if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
	13	} else {
2cffe299	14	if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
e2641e09	15	o = zmalloc(sizeof(*o));
	16	}
	17	o->type = type;
	18	o->encoding = REDIS_ENCODING_RAW;
	19	o->ptr = ptr;
	20	o->refcount = 1;
	21	if (server.vm_enabled) {
	22	/* Note that this code may run in the context of an I/O thread
	23	* and accessing server.lruclock in theory is an error
	24	* (no locks). But in practice this is safe, and even if we read
	25	* garbage Redis will not fail. */
	26	o->lru = server.lruclock;
	27	o->storage = REDIS_VM_MEMORY;
	28	}
	29	return o;
	30	}
	31
	32	robj createStringObject(char ptr, size_t len) {
	33	return createObject(REDIS_STRING,sdsnewlen(ptr,len));
	34	}
	35
	36	robj *createStringObjectFromLongLong(long long value) {
	37	robj *o;
	38	if (value >= 0 && value < REDIS_SHARED_INTEGERS) {
	39	incrRefCount(shared.integers[value]);
	40	o = shared.integers[value];
	41	} else {
	42	if (value >= LONG_MIN && value <= LONG_MAX) {
	43	o = createObject(REDIS_STRING, NULL);
	44	o->encoding = REDIS_ENCODING_INT;
	45	o->ptr = (void*)((long)value);
	46	} else {
	47	o = createObject(REDIS_STRING,sdsfromlonglong(value));
	48	}
	49	}
	50	return o;
	51	}
	52
	53	robj dupStringObject(robj o) {
	54	redisAssert(o->encoding == REDIS_ENCODING_RAW);
	55	return createStringObject(o->ptr,sdslen(o->ptr));
	56	}
	57
	58	robj *createListObject(void) {
	59	list *l = listCreate();
	60	robj *o = createObject(REDIS_LIST,l);
	61	listSetFreeMethod(l,decrRefCount);
	62	o->encoding = REDIS_ENCODING_LINKEDLIST;
	63	return o;
	64	}
	65
	66	robj *createZiplistObject(void) {
	67	unsigned char *zl = ziplistNew();
	68	robj *o = createObject(REDIS_LIST,zl);
	69	o->encoding = REDIS_ENCODING_ZIPLIST;
	70	return o;
	71	}
	72
	73	robj *createSetObject(void) {
	74	dict *d = dictCreate(&setDictType,NULL);
	75	return createObject(REDIS_SET,d);
	76	}
	77
	78	robj *createHashObject(void) {
79	/* All the Hashes start as zipmaps. Will be automatically converted
80	* into hash tables if there are enough elements or big elements
81	* inside. */
82	unsigned char *zm = zipmapNew();
83	robj *o = createObject(REDIS_HASH,zm);
84	o->encoding = REDIS_ENCODING_ZIPMAP;
85	return o;
86	}
87
88	robj *createZsetObject(void) {
89	zset zs = zmalloc(sizeof(zs));
90
91	zs->dict = dictCreate(&zsetDictType,NULL);
92	zs->zsl = zslCreate();
93	return createObject(REDIS_ZSET,zs);
94	}
95
96	void freeStringObject(robj *o) {
97	if (o->encoding == REDIS_ENCODING_RAW) {
98	sdsfree(o->ptr);
99	}
100	}
101
102	void freeListObject(robj *o) {
103	switch (o->encoding) {
104	case REDIS_ENCODING_LINKEDLIST:
105	listRelease((list*) o->ptr);
106	break;
107	case REDIS_ENCODING_ZIPLIST:
108	zfree(o->ptr);
109	break;
110	default:
111	redisPanic("Unknown list encoding type");
112	}
113	}
114
115	void freeSetObject(robj *o) {
116	dictRelease((dict*) o->ptr);
117	}
118
119	void freeZsetObject(robj *o) {
120	zset *zs = o->ptr;
121
122	dictRelease(zs->dict);
123	zslFree(zs->zsl);
124	zfree(zs);
125	}
126
127	void freeHashObject(robj *o) {
128	switch (o->encoding) {
129	case REDIS_ENCODING_HT:
130	dictRelease((dict*) o->ptr);
131	break;
132	case REDIS_ENCODING_ZIPMAP:
133	zfree(o->ptr);
134	break;
135	default:
136	redisPanic("Unknown hash encoding type");
137	break;
138	}
139	}
140
141	void incrRefCount(robj *o) {
142	o->refcount++;
143	}
144
145	void decrRefCount(void *obj) {
146	robj *o = obj;
147
148	/* Object is a swapped out value, or in the process of being loaded. */
149	if (server.vm_enabled &&
150	(o->storage == REDIS_VM_SWAPPED \|\| o->storage == REDIS_VM_LOADING))
151	{
152	vmpointer *vp = obj;
153	if (o->storage == REDIS_VM_LOADING) vmCancelThreadedIOJob(o);
154	vmMarkPagesFree(vp->page,vp->usedpages);
155	server.vm_stats_swapped_objects--;
156	zfree(vp);
157	return;
158	}
159
160	if (o->refcount <= 0) redisPanic("decrRefCount against refcount <= 0");
161	/* Object is in memory, or in the process of being swapped out.
162	*
163	* If the object is being swapped out, abort the operation on
164	* decrRefCount even if the refcount does not drop to 0: the object
165	* is referenced at least two times, as value of the key AND as
166	* job->val in the iojob. So if we don't invalidate the iojob, when it is
167	* done but the relevant key was removed in the meantime, the
168	* complete jobs handler will not find the key about the job and the
169	* assert will fail. */
170	if (server.vm_enabled && o->storage == REDIS_VM_SWAPPING)
171	vmCancelThreadedIOJob(o);
172	if (--(o->refcount) == 0) {
173	switch(o->type) {
174	case REDIS_STRING: freeStringObject(o); break;
175	case REDIS_LIST: freeListObject(o); break;
176	case REDIS_SET: freeSetObject(o); break;
177	case REDIS_ZSET: freeZsetObject(o); break;
178	case REDIS_HASH: freeHashObject(o); break;
179	default: redisPanic("Unknown object type"); break;
180	}
181	if (server.vm_enabled) pthread_mutex_lock(&server.obj_freelist_mutex);
182	if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX \|\|
183	!listAddNodeHead(server.objfreelist,o))
184	zfree(o);
185	if (server.vm_enabled) pthread_mutex_unlock(&server.obj_freelist_mutex);
186	}
187	}
188
189	int checkType(redisClient c, robj o, int type) {
190	if (o->type != type) {
191	addReply(c,shared.wrongtypeerr);
192	return 1;
193	}
194	return 0;
195	}
196
197	/* Try to encode a string object in order to save space */
198	robj tryObjectEncoding(robj o) {
199	long value;
200	sds s = o->ptr;
201
202	if (o->encoding != REDIS_ENCODING_RAW)
203	return o; /* Already encoded */
204
205	/* It's not safe to encode shared objects: shared objects can be shared
206	* everywhere in the "object space" of Redis. Encoded objects can only
207	* appear as "values" (and not, for instance, as keys) */
208	if (o->refcount > 1) return o;
209
210	/* Currently we try to encode only strings */
211	redisAssert(o->type == REDIS_STRING);
212
213	/* Check if we can represent this string as a long integer */
214	if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return o;
215
0e5441d8	216	/* Ok, this object can be encoded...
	217	*
	218	* Can I use a shared object? Only if the object is inside a given
cdbea20a	219	* range and if this is the main thread, since when VM is enabled we
0e5441d8	220	* have the constraint that I/O thread should only handle non-shared
	221	* objects, in order to avoid race conditions (we don't have per-object
	222	* locking). */
	223	if (value >= 0 && value < REDIS_SHARED_INTEGERS &&
	224	pthread_equal(pthread_self(),server.mainthread)) {
e2641e09	225	decrRefCount(o);
	226	incrRefCount(shared.integers[value]);
	227	return shared.integers[value];
	228	} else {
	229	o->encoding = REDIS_ENCODING_INT;
	230	sdsfree(o->ptr);
	231	o->ptr = (void*) value;
	232	return o;
	233	}
	234	}
	235
	236	/* Get a decoded version of an encoded object (returned as a new object).
	237	* If the object is already raw-encoded just increment the ref count. */
	238	robj getDecodedObject(robj o) {
	239	robj *dec;
	240
	241	if (o->encoding == REDIS_ENCODING_RAW) {
	242	incrRefCount(o);
	243	return o;
	244	}
	245	if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
	246	char buf[32];
	247
	248	ll2string(buf,32,(long)o->ptr);
	249	dec = createStringObject(buf,strlen(buf));
	250	return dec;
	251	} else {
	252	redisPanic("Unknown encoding type");
	253	}
	254	}
	255
	256	/* Compare two string objects via strcmp() or alike.
	257	* Note that the objects may be integer-encoded. In such a case we
	258	* use ll2string() to get a string representation of the numbers on the stack
	259	* and compare the strings, it's much faster than calling getDecodedObject().
	260	*
	261	* Important note: if objects are not integer encoded, but binary-safe strings,
	262	* sdscmp() from sds.c will apply memcmp() so this function ca be considered
	263	* binary safe. */
	264	int compareStringObjects(robj a, robj b) {
	265	redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
	266	char bufa[128], bufb[128], astr, bstr;
	267	int bothsds = 1;
	268
	269	if (a == b) return 0;
	270	if (a->encoding != REDIS_ENCODING_RAW) {
	271	ll2string(bufa,sizeof(bufa),(long) a->ptr);
	272	astr = bufa;
	273	bothsds = 0;
	274	} else {
	275	astr = a->ptr;
	276	}
	277	if (b->encoding != REDIS_ENCODING_RAW) {
	278	ll2string(bufb,sizeof(bufb),(long) b->ptr);
	279	bstr = bufb;
	280	bothsds = 0;
	281	} else {
	282	bstr = b->ptr;
	283	}
	284	return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
	285	}
	286
	287	/* Equal string objects return 1 if the two objects are the same from the
	288	* point of view of a string comparison, otherwise 0 is returned. Note that
289	* this function is faster then checking for (compareStringObject(a,b) == 0)
290	* because it can perform some more optimization. */
291	int equalStringObjects(robj a, robj b) {
292	if (a->encoding != REDIS_ENCODING_RAW && b->encoding != REDIS_ENCODING_RAW){
293	return a->ptr == b->ptr;
294	} else {
295	return compareStringObjects(a,b) == 0;
296	}
297	}
298
299	size_t stringObjectLen(robj *o) {
300	redisAssert(o->type == REDIS_STRING);
301	if (o->encoding == REDIS_ENCODING_RAW) {
302	return sdslen(o->ptr);
303	} else {
304	char buf[32];
305
306	return ll2string(buf,32,(long)o->ptr);
307	}
308	}
309
310	int getDoubleFromObject(robj o, double target) {
311	double value;
312	char *eptr;
313
314	if (o == NULL) {
315	value = 0;
316	} else {
317	redisAssert(o->type == REDIS_STRING);
318	if (o->encoding == REDIS_ENCODING_RAW) {
319	value = strtod(o->ptr, &eptr);
320	if (eptr[0] != '\0') return REDIS_ERR;
321	} else if (o->encoding == REDIS_ENCODING_INT) {
322	value = (long)o->ptr;
323	} else {
324	redisPanic("Unknown string encoding");
325	}
326	}
327
328	*target = value;
329	return REDIS_OK;
330	}
331
332	int getDoubleFromObjectOrReply(redisClient c, robj o, double target, const char msg) {
333	double value;
334	if (getDoubleFromObject(o, &value) != REDIS_OK) {
335	if (msg != NULL) {
336	addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
337	} else {
338	addReplySds(c, sdsnew("-ERR value is not a double\r\n"));
339	}
340	return REDIS_ERR;
341	}
342
343	*target = value;
344	return REDIS_OK;
345	}
346
347	int getLongLongFromObject(robj o, long long target) {
348	long long value;
349	char *eptr;
350
351	if (o == NULL) {
352	value = 0;
353	} else {
354	redisAssert(o->type == REDIS_STRING);
355	if (o->encoding == REDIS_ENCODING_RAW) {
356	value = strtoll(o->ptr, &eptr, 10);
357	if (eptr[0] != '\0') return REDIS_ERR;
358	} else if (o->encoding == REDIS_ENCODING_INT) {
359	value = (long)o->ptr;
360	} else {
361	redisPanic("Unknown string encoding");
362	}
363	}
364
365	*target = value;
366	return REDIS_OK;
367	}
368
369	int getLongLongFromObjectOrReply(redisClient c, robj o, long long target, const char msg) {
370	long long value;
371	if (getLongLongFromObject(o, &value) != REDIS_OK) {
372	if (msg != NULL) {
373	addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
374	} else {
375	addReplySds(c, sdsnew("-ERR value is not an integer\r\n"));
376	}
377	return REDIS_ERR;
378	}
379
380	*target = value;
381	return REDIS_OK;
382	}
383
384	int getLongFromObjectOrReply(redisClient c, robj o, long target, const char msg) {
385	long long value;
386
387	if (getLongLongFromObjectOrReply(c, o, &value, msg) != REDIS_OK) return REDIS_ERR;
388	if (value < LONG_MIN \|\| value > LONG_MAX) {
389	if (msg != NULL) {
390	addReplySds(c, sdscatprintf(sdsempty(), "-ERR %s\r\n", msg));
391	} else {
392	addReplySds(c, sdsnew("-ERR value is out of range\r\n"));
393	}
394	return REDIS_ERR;
395	}
396
397	*target = value;
398	return REDIS_OK;
399	}
400
401	char *strEncoding(int encoding) {
402	switch(encoding) {
403	case REDIS_ENCODING_RAW: return "raw";
404	case REDIS_ENCODING_INT: return "int";
405	case REDIS_ENCODING_HT: return "hashtable";
406	case REDIS_ENCODING_ZIPMAP: return "zipmap";
407	case REDIS_ENCODING_LINKEDLIST: return "linkedlist";
408	case REDIS_ENCODING_ZIPLIST: return "ziplist";
409	default: return "unknown";
410	}
411	}