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#include "redis.h"
/*-----------------------------------------------------------------------------
* String Commands
*----------------------------------------------------------------------------*/
static int checkStringLength(redisClient *c, long long size) {
if (size > 512*1024*1024) {
addReplyError(c,"string exceeds maximum allowed size (512MB)");
return REDIS_ERR;
}
return REDIS_OK;
}
void setGenericCommand(redisClient *c, int nx, robj *key, robj *val, robj *expire) {
int retval;
long seconds = 0; /* initialized to avoid an harmness warning */
if (expire) {
if (getLongFromObjectOrReply(c, expire, &seconds, NULL) != REDIS_OK)
return;
if (seconds <= 0) {
addReplyError(c,"invalid expire time in SETEX");
return;
}
}
retval = dbAdd(c->db,key,val);
if (retval == REDIS_ERR) {
if (!nx) {
dbReplace(c->db,key,val);
incrRefCount(val);
} else {
addReply(c,shared.czero);
return;
}
} else {
incrRefCount(val);
}
touchWatchedKey(c->db,key);
server.dirty++;
removeExpire(c->db,key);
if (expire) setExpire(c->db,key,time(NULL)+seconds);
addReply(c, nx ? shared.cone : shared.ok);
}
void setCommand(redisClient *c) {
c->argv[2] = tryObjectEncoding(c->argv[2]);
setGenericCommand(c,0,c->argv[1],c->argv[2],NULL);
}
void setnxCommand(redisClient *c) {
c->argv[2] = tryObjectEncoding(c->argv[2]);
setGenericCommand(c,1,c->argv[1],c->argv[2],NULL);
}
void setexCommand(redisClient *c) {
c->argv[3] = tryObjectEncoding(c->argv[3]);
setGenericCommand(c,0,c->argv[1],c->argv[3],c->argv[2]);
}
int getGenericCommand(redisClient *c) {
robj *o;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL)
return REDIS_OK;
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
return REDIS_ERR;
} else {
addReplyBulk(c,o);
return REDIS_OK;
}
}
void getCommand(redisClient *c) {
getGenericCommand(c);
}
void getsetCommand(redisClient *c) {
if (getGenericCommand(c) == REDIS_ERR) return;
c->argv[2] = tryObjectEncoding(c->argv[2]);
dbReplace(c->db,c->argv[1],c->argv[2]);
incrRefCount(c->argv[2]);
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
removeExpire(c->db,c->argv[1]);
}
static int getBitOffsetFromArgument(redisClient *c, robj *o, size_t *offset) {
long long loffset;
char *err = "bit offset is not an integer or out of range";
if (getLongLongFromObjectOrReply(c,o,&loffset,err) != REDIS_OK)
return REDIS_ERR;
/* Limit offset to 512MB in bytes */
if ((loffset < 0) || ((unsigned long long)loffset >> 3) >= (512*1024*1024))
{
addReplyError(c,err);
return REDIS_ERR;
}
*offset = (size_t)loffset;
return REDIS_OK;
}
void setbitCommand(redisClient *c) {
robj *o;
char *err = "bit is not an integer or out of range";
size_t bitoffset;
int byte, bit;
int byteval, bitval;
long on;
if (getBitOffsetFromArgument(c,c->argv[2],&bitoffset) != REDIS_OK)
return;
if (getLongFromObjectOrReply(c,c->argv[3],&on,err) != REDIS_OK)
return;
/* Bits can only be set or cleared... */
if (on & ~1) {
addReplyError(c,err);
return;
}
o = lookupKeyWrite(c->db,c->argv[1]);
if (o == NULL) {
o = createObject(REDIS_STRING,sdsempty());
dbAdd(c->db,c->argv[1],o);
} else {
if (checkType(c,o,REDIS_STRING)) return;
/* Create a copy when the object is shared or encoded. */
if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
robj *decoded = getDecodedObject(o);
o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
decrRefCount(decoded);
dbReplace(c->db,c->argv[1],o);
}
}
/* Grow sds value to the right length if necessary */
byte = bitoffset >> 3;
o->ptr = sdsgrowzero(o->ptr,byte+1);
/* Get current values */
byteval = ((char*)o->ptr)[byte];
bit = 7 - (bitoffset & 0x7);
bitval = byteval & (1 << bit);
/* Update byte with new bit value and return original value */
byteval &= ~(1 << bit);
byteval |= ((on & 0x1) << bit);
((char*)o->ptr)[byte] = byteval;
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
addReply(c, bitval ? shared.cone : shared.czero);
}
void getbitCommand(redisClient *c) {
robj *o;
char llbuf[32];
size_t bitoffset;
size_t byte, bit;
size_t bitval = 0;
if (getBitOffsetFromArgument(c,c->argv[2],&bitoffset) != REDIS_OK)
return;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,o,REDIS_STRING)) return;
byte = bitoffset >> 3;
bit = 7 - (bitoffset & 0x7);
if (o->encoding != REDIS_ENCODING_RAW) {
if (byte < (size_t)ll2string(llbuf,sizeof(llbuf),(long)o->ptr))
bitval = llbuf[byte] & (1 << bit);
} else {
if (byte < sdslen(o->ptr))
bitval = ((char*)o->ptr)[byte] & (1 << bit);
}
addReply(c, bitval ? shared.cone : shared.czero);
}
void setrangeCommand(redisClient *c) {
robj *o;
long offset;
sds value = c->argv[3]->ptr;
if (getLongFromObjectOrReply(c,c->argv[2],&offset,NULL) != REDIS_OK)
return;
if (offset < 0) {
addReplyError(c,"offset is out of range");
return;
}
o = lookupKeyWrite(c->db,c->argv[1]);
if (o == NULL) {
/* Return 0 when setting nothing on a non-existing string */
if (sdslen(value) == 0) {
addReply(c,shared.czero);
return;
}
/* Return when the resulting string exceeds allowed size */
if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK)
return;
o = createObject(REDIS_STRING,sdsempty());
dbAdd(c->db,c->argv[1],o);
} else {
size_t olen;
/* Key exists, check type */
if (checkType(c,o,REDIS_STRING))
return;
/* Return existing string length when setting nothing */
olen = stringObjectLen(o);
if (sdslen(value) == 0) {
addReplyLongLong(c,olen);
return;
}
/* Return when the resulting string exceeds allowed size */
if (checkStringLength(c,offset+sdslen(value)) != REDIS_OK)
return;
/* Create a copy when the object is shared or encoded. */
if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
robj *decoded = getDecodedObject(o);
o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
decrRefCount(decoded);
dbReplace(c->db,c->argv[1],o);
}
}
if (sdslen(value) > 0) {
o->ptr = sdsgrowzero(o->ptr,offset+sdslen(value));
memcpy((char*)o->ptr+offset,value,sdslen(value));
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
}
addReplyLongLong(c,sdslen(o->ptr));
}
void getrangeCommand(redisClient *c) {
robj *o;
long start, end;
char *str, llbuf[32];
size_t strlen;
if (getLongFromObjectOrReply(c,c->argv[2],&start,NULL) != REDIS_OK)
return;
if (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != REDIS_OK)
return;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.emptybulk)) == NULL ||
checkType(c,o,REDIS_STRING)) return;
if (o->encoding == REDIS_ENCODING_INT) {
str = llbuf;
strlen = ll2string(llbuf,sizeof(llbuf),(long)o->ptr);
} else {
str = o->ptr;
strlen = sdslen(str);
}
/* Convert negative indexes */
if (start < 0) start = strlen+start;
if (end < 0) end = strlen+end;
if (start < 0) start = 0;
if (end < 0) end = 0;
if ((unsigned)end >= strlen) end = strlen-1;
/* Precondition: end >= 0 && end < strlen, so the only condition where
* nothing can be returned is: start > end. */
if (start > end) {
addReply(c,shared.emptybulk);
} else {
addReplyBulkCBuffer(c,(char*)str+start,end-start+1);
}
}
void mgetCommand(redisClient *c) {
int j;
addReplyMultiBulkLen(c,c->argc-1);
for (j = 1; j < c->argc; j++) {
robj *o = lookupKeyRead(c->db,c->argv[j]);
if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
if (o->type != REDIS_STRING) {
addReply(c,shared.nullbulk);
} else {
addReplyBulk(c,o);
}
}
}
}
void msetGenericCommand(redisClient *c, int nx) {
int j, busykeys = 0;
if ((c->argc % 2) == 0) {
addReplyError(c,"wrong number of arguments for MSET");
return;
}
/* Handle the NX flag. The MSETNX semantic is to return zero and don't
* set nothing at all if at least one already key exists. */
if (nx) {
for (j = 1; j < c->argc; j += 2) {
if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
busykeys++;
}
}
}
if (busykeys) {
addReply(c, shared.czero);
return;
}
for (j = 1; j < c->argc; j += 2) {
c->argv[j+1] = tryObjectEncoding(c->argv[j+1]);
dbReplace(c->db,c->argv[j],c->argv[j+1]);
incrRefCount(c->argv[j+1]);
removeExpire(c->db,c->argv[j]);
touchWatchedKey(c->db,c->argv[j]);
}
server.dirty += (c->argc-1)/2;
addReply(c, nx ? shared.cone : shared.ok);
}
void msetCommand(redisClient *c) {
msetGenericCommand(c,0);
}
void msetnxCommand(redisClient *c) {
msetGenericCommand(c,1);
}
void incrDecrCommand(redisClient *c, long long incr) {
long long value, oldvalue;
robj *o;
o = lookupKeyWrite(c->db,c->argv[1]);
if (o != NULL && checkType(c,o,REDIS_STRING)) return;
if (getLongLongFromObjectOrReply(c,o,&value,NULL) != REDIS_OK) return;
oldvalue = value;
value += incr;
if ((incr < 0 && value > oldvalue) || (incr > 0 && value < oldvalue)) {
addReplyError(c,"increment or decrement would overflow");
return;
}
o = createStringObjectFromLongLong(value);
dbReplace(c->db,c->argv[1],o);
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
addReply(c,shared.colon);
addReply(c,o);
addReply(c,shared.crlf);
}
void incrCommand(redisClient *c) {
incrDecrCommand(c,1);
}
void decrCommand(redisClient *c) {
incrDecrCommand(c,-1);
}
void incrbyCommand(redisClient *c) {
long long incr;
if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
incrDecrCommand(c,incr);
}
void decrbyCommand(redisClient *c) {
long long incr;
if (getLongLongFromObjectOrReply(c, c->argv[2], &incr, NULL) != REDIS_OK) return;
incrDecrCommand(c,-incr);
}
void appendCommand(redisClient *c) {
size_t totlen;
robj *o, *append;
o = lookupKeyWrite(c->db,c->argv[1]);
if (o == NULL) {
/* Create the key */
c->argv[2] = tryObjectEncoding(c->argv[2]);
dbAdd(c->db,c->argv[1],c->argv[2]);
incrRefCount(c->argv[2]);
totlen = stringObjectLen(c->argv[2]);
} else {
/* Key exists, check type */
if (checkType(c,o,REDIS_STRING))
return;
/* "append" is an argument, so always an sds */
append = c->argv[2];
totlen = stringObjectLen(o)+sdslen(append->ptr);
if (checkStringLength(c,totlen) != REDIS_OK)
return;
/* If the object is shared or encoded, we have to make a copy */
if (o->refcount != 1 || o->encoding != REDIS_ENCODING_RAW) {
robj *decoded = getDecodedObject(o);
o = createStringObject(decoded->ptr, sdslen(decoded->ptr));
decrRefCount(decoded);
dbReplace(c->db,c->argv[1],o);
}
/* Append the value */
o->ptr = sdscatlen(o->ptr,append->ptr,sdslen(append->ptr));
totlen = sdslen(o->ptr);
}
touchWatchedKey(c->db,c->argv[1]);
server.dirty++;
addReplyLongLong(c,totlen);
}
void strlenCommand(redisClient *c) {
robj *o;
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,o,REDIS_STRING)) return;
addReplyLongLong(c,stringObjectLen(o));
}
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