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LCS: implement KEYS option.

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This commit is contained in:
antirez 2020-04-01 22:11:59 +02:00
parent 4cbf3f5ddd
commit 8cdc15c309
1 changed files with 18 additions and 2 deletions
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20
src/t_string.c
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@ -482,12 +482,13 @@ void strlenCommand(client *c) {
/* LCS -- Longest common subsequence.
*
* LCS [IDX] [STOREIDX <key>] STRINGS <string> <string> */
* LCS [IDX] [STOREIDX <key>] STRINGS <string> <string> | KEYS <keya> <keyb> */
void lcsCommand(client *c) {
uint32_t i, j;
sds a = NULL, b = NULL;
int getlen = 0, getidx = 0;
robj *idxkey = NULL; /* STOREIDX will set this and getidx to 1. */
robj *obja = NULL, *objb = NULL;
for (j = 1; j < (uint32_t)c->argc; j++) {
char *opt = c->argv[j]->ptr;
@ -509,6 +510,18 @@ void lcsCommand(client *c) {
a = c->argv[j+1]->ptr;
b = c->argv[j+2]->ptr;
j += 2;
} else if (!strcasecmp(opt,"KEYS")) {
if (moreargs != 2) {
addReplyError(c,"LCS requires exactly two keys");
return;
}
obja = lookupKeyRead(c->db,c->argv[j+1]);
objb = lookupKeyRead(c->db,c->argv[j+2]);
obja = obja ? getDecodedObject(obja) : createStringObject("",0);
objb = objb ? getDecodedObject(objb) : createStringObject("",0);
a = obja->ptr;
b = objb->ptr;
j += 2;
} else {
addReply(c,shared.syntaxerr);
return;
@ -517,7 +530,8 @@ void lcsCommand(client *c) {
/* Complain if the user passed ambiguous parameters. */
if (a == NULL) {
addReplyError(c,"STRINGS <string-a> <string-b> is mandatory");
addReplyError(c,"Please specify two strings: "
"STRINGS or KEYS options are mandatory");
return;
} else if (getlen && (getidx && idxkey == NULL)) {
addReplyError(c,
@ -651,6 +665,8 @@ void lcsCommand(client *c) {
}
/* Cleanup. */
if (obja) decrRefCount(obja);
if (objb) decrRefCount(objb);
sdsfree(result);
zfree(lcs);
return;