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Utils: added function to get radix 10 string length of signed integer.

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This commit is contained in:
antirez 2015-02-27 15:20:58 +01:00
parent 7e6b4ea67b
commit c95507881a
2 changed files with 14 additions and 0 deletions
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12
src/util.c
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@ -251,6 +251,18 @@ uint32_t digits10(uint64_t v) {
return 12 + digits10(v / 1000000000000UL); return 12 + digits10(v / 1000000000000UL);
} }
/* Like digits10() but for signed values. */
uint32_t sdigits10(int64_t v) {
if (v < 0) {
/* Abs value of LLONG_MIN requires special handling. */
uint64_t uv = (v != LLONG_MIN) ?
-v : ((uint64_t) LLONG_MAX)+1;
return digits10(uv)+1; /* +1 for the minus. */
} else {
return digits10(v);
}
}
/* Convert a long long into a string. Returns the number of /* Convert a long long into a string. Returns the number of
* characters needed to represent the number. * characters needed to represent the number.
* If the buffer is not big enough to store the string, 0 is returned. * If the buffer is not big enough to store the string, 0 is returned.

2
src/util.h
View File

@ -35,6 +35,8 @@
int stringmatchlen(const char *p, int plen, const char *s, int slen, int nocase); int stringmatchlen(const char *p, int plen, const char *s, int slen, int nocase);
int stringmatch(const char *p, const char *s, int nocase); int stringmatch(const char *p, const char *s, int nocase);
long long memtoll(const char *p, int *err); long long memtoll(const char *p, int *err);
uint32_t digits10(uint64_t v);
uint32_t sdigits10(int64_t v);
int ll2string(char *s, size_t len, long long value); int ll2string(char *s, size_t len, long long value);
int string2ll(const char *s, size_t slen, long long *value); int string2ll(const char *s, size_t slen, long long *value);
int string2l(const char *s, size_t slen, long *value); int string2l(const char *s, size_t slen, long *value);