X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/7c0e1b53c4c4f646c788fcd09666e1c321c1d134..1858da2faae3b6a8becf4f7eef3f712d6e4b986b:/src/util.c diff --git a/src/util.c b/src/util.c index 599dc690..bcdafc63 100644 --- a/src/util.c +++ b/src/util.c @@ -1,7 +1,14 @@ -#include "redis.h" +#include "fmacros.h" +#include +#include +#include #include #include #include +#include +#include + +#include "util.h" /* Glob-style pattern matching. */ int stringmatchlen(const char *pattern, int patternLen, @@ -204,8 +211,8 @@ int ll2string(char *s, size_t len, long long value) { /* Convert a string into a long long. Returns 1 if the string could be parsed * into a (non-overflowing) long long, 0 otherwise. The value will be set to * the parsed value when appropriate. */ -int string2ll(char *s, size_t slen, long long *value) { - char *p = s; +int string2ll(const char *s, size_t slen, long long *value) { + const char *p = s; size_t plen = 0; int negative = 0; unsigned long long v; @@ -213,6 +220,12 @@ int string2ll(char *s, size_t slen, long long *value) { if (plen == slen) return 0; + /* Special case: first and only digit is 0. */ + if (slen == 1 && p[0] == '0') { + if (value != NULL) *value = 0; + return 1; + } + if (p[0] == '-') { negative = 1; p++; plen++; @@ -222,10 +235,13 @@ int string2ll(char *s, size_t slen, long long *value) { return 0; } - /* First digit should be 1-9. */ + /* First digit should be 1-9, otherwise the string should just be 0. */ if (p[0] >= '1' && p[0] <= '9') { v = p[0]-'0'; p++; plen++; + } else if (p[0] == '0' && slen == 1) { + *value = 0; + return 1; } else { return 0; } @@ -247,7 +263,7 @@ int string2ll(char *s, size_t slen, long long *value) { return 0; if (negative) { - if (v > (-(unsigned long long)LLONG_MIN)) /* Overflow. */ + if (v > ((unsigned long long)(-(LLONG_MIN+1))+1)) /* Overflow. */ return 0; if (value != NULL) *value = -v; } else { @@ -258,6 +274,22 @@ int string2ll(char *s, size_t slen, long long *value) { return 1; } +/* Convert a string into a long. Returns 1 if the string could be parsed into a + * (non-overflowing) long, 0 otherwise. The value will be set to the parsed + * value when appropriate. */ +int string2l(const char *s, size_t slen, long *lval) { + long long llval; + + if (!string2ll(s,slen,&llval)) + return 0; + + if (llval < LONG_MIN || llval > LONG_MAX) + return 0; + + *lval = (long)llval; + return 1; +} + /* Convert a double to a string representation. Returns the number of bytes * required. The representation should always be parsable by stdtod(3). */ int d2string(char *buf, size_t len, double value) { @@ -297,44 +329,162 @@ int d2string(char *buf, size_t len, double value) { return len; } -/* Check if the sds string 's' can be represented by a long long - * (that is, is a number that fits into long without any other space or - * character before or after the digits, so that converting this number - * back to a string will result in the same bytes as the original string). - * - * If so, the function returns REDIS_OK and *llongval is set to the value - * of the number. Otherwise REDIS_ERR is returned */ -int isStringRepresentableAsLongLong(sds s, long long *llongval) { - char buf[32], *endptr; - long long value; - int slen; - - value = strtoll(s, &endptr, 10); - if (endptr[0] != '\0') return REDIS_ERR; - slen = ll2string(buf,32,value); - - /* If the number converted back into a string is not identical - * then it's not possible to encode the string as integer */ - if (sdslen(s) != (unsigned)slen || memcmp(buf,s,slen)) return REDIS_ERR; - if (llongval) *llongval = value; - return REDIS_OK; +/* Generate the Redis "Run ID", a SHA1-sized random number that identifies a + * given execution of Redis, so that if you are talking with an instance + * having run_id == A, and you reconnect and it has run_id == B, you can be + * sure that it is either a different instance or it was restarted. */ +void getRandomHexChars(char *p, unsigned int len) { + FILE *fp = fopen("/dev/urandom","r"); + char *charset = "0123456789abcdef"; + unsigned int j; + + if (fp == NULL || fread(p,len,1,fp) == 0) { + /* If we can't read from /dev/urandom, do some reasonable effort + * in order to create some entropy, since this function is used to + * generate run_id and cluster instance IDs */ + char *x = p; + unsigned int l = len; + struct timeval tv; + pid_t pid = getpid(); + + /* Use time and PID to fill the initial array. */ + gettimeofday(&tv,NULL); + if (l >= sizeof(tv.tv_usec)) { + memcpy(x,&tv.tv_usec,sizeof(tv.tv_usec)); + l -= sizeof(tv.tv_usec); + x += sizeof(tv.tv_usec); + } + if (l >= sizeof(tv.tv_sec)) { + memcpy(x,&tv.tv_sec,sizeof(tv.tv_sec)); + l -= sizeof(tv.tv_sec); + x += sizeof(tv.tv_sec); + } + if (l >= sizeof(pid)) { + memcpy(x,&pid,sizeof(pid)); + l -= sizeof(pid); + x += sizeof(pid); + } + /* Finally xor it with rand() output, that was already seeded with + * time() at startup. */ + for (j = 0; j < len; j++) + p[j] ^= rand(); + } + /* Turn it into hex digits taking just 4 bits out of 8 for every byte. */ + for (j = 0; j < len; j++) + p[j] = charset[p[j] & 0x0F]; + fclose(fp); } -int isStringRepresentableAsLong(sds s, long *longval) { - long long ll; +#ifdef UTIL_TEST_MAIN +#include + +void test_string2ll(void) { + char buf[32]; + long long v; + + /* May not start with +. */ + strcpy(buf,"+1"); + assert(string2ll(buf,strlen(buf),&v) == 0); + + /* Leading space. */ + strcpy(buf," 1"); + assert(string2ll(buf,strlen(buf),&v) == 0); + + /* Trailing space. */ + strcpy(buf,"1 "); + assert(string2ll(buf,strlen(buf),&v) == 0); + + /* May not start with 0. */ + strcpy(buf,"01"); + assert(string2ll(buf,strlen(buf),&v) == 0); + + strcpy(buf,"-1"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == -1); - if (isStringRepresentableAsLongLong(s,&ll) == REDIS_ERR) return REDIS_ERR; - if (ll < LONG_MIN || ll > LONG_MAX) return REDIS_ERR; - *longval = (long)ll; - return REDIS_OK; + strcpy(buf,"0"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == 0); + + strcpy(buf,"1"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == 1); + + strcpy(buf,"99"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == 99); + + strcpy(buf,"-99"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == -99); + + strcpy(buf,"-9223372036854775808"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == LLONG_MIN); + + strcpy(buf,"-9223372036854775809"); /* overflow */ + assert(string2ll(buf,strlen(buf),&v) == 0); + + strcpy(buf,"9223372036854775807"); + assert(string2ll(buf,strlen(buf),&v) == 1); + assert(v == LLONG_MAX); + + strcpy(buf,"9223372036854775808"); /* overflow */ + assert(string2ll(buf,strlen(buf),&v) == 0); } -int isObjectRepresentableAsLongLong(robj *o, long long *llongval) { - redisAssert(o->type == REDIS_STRING); - if (o->encoding == REDIS_ENCODING_INT) { - if (llongval) *llongval = (long) o->ptr; - return REDIS_OK; - } else { - return isStringRepresentableAsLongLong(o->ptr,llongval); - } +void test_string2l(void) { + char buf[32]; + long v; + + /* May not start with +. */ + strcpy(buf,"+1"); + assert(string2l(buf,strlen(buf),&v) == 0); + + /* May not start with 0. */ + strcpy(buf,"01"); + assert(string2l(buf,strlen(buf),&v) == 0); + + strcpy(buf,"-1"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == -1); + + strcpy(buf,"0"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == 0); + + strcpy(buf,"1"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == 1); + + strcpy(buf,"99"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == 99); + + strcpy(buf,"-99"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == -99); + +#if LONG_MAX != LLONG_MAX + strcpy(buf,"-2147483648"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == LONG_MIN); + + strcpy(buf,"-2147483649"); /* overflow */ + assert(string2l(buf,strlen(buf),&v) == 0); + + strcpy(buf,"2147483647"); + assert(string2l(buf,strlen(buf),&v) == 1); + assert(v == LONG_MAX); + + strcpy(buf,"2147483648"); /* overflow */ + assert(string2l(buf,strlen(buf),&v) == 0); +#endif +} + +int main(int argc, char **argv) { + test_string2ll(); + test_string2l(); + return 0; } +#endif