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utils: Add datum_atoi_strict for simple fixed-size buffer number parsing

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Luke Dashjr 2024-10-21 22:41:10 +00:00
parent 62d92d04fb
commit 940a372494
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2 changed files with 17 additions and 0 deletions
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16
src/datum_utils.c
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@ -33,6 +33,7 @@
* *
*/ */
#include <assert.h>
#include <sodium.h> #include <sodium.h>
#include <stdio.h> #include <stdio.h>
#include <stdarg.h> #include <stdarg.h>
@ -703,3 +704,18 @@ uint64_t datum_siphash_mod8(const void *src, uint64_t sz, const unsigned char ke
SIPHASH_DOUBLE_ROUND(v0,v1,v2,v3); SIPHASH_DOUBLE_ROUND(v0,v1,v2,v3);
return (v0 ^ v1) ^ (v2 ^ v3); return (v0 ^ v1) ^ (v2 ^ v3);
} }
// Uses a fixed-size buffer; positive only; digits only
// Returns -1 on failure
int datum_atoi_strict(const char * const s, const size_t size) {
if (!size) return -1;
assert(s);
int ret = 0;
for (size_t i = 0; i < size; ++i) {
if (s[i] < '0' || s[i] > '9') return -1;
int digit = s[i] - '0';
if (ret > (INT_MAX - digit) / 10) return -1;
ret = (ret * 10) + digit;
}
return ret;
}

1
src/datum_utils.h
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@ -69,6 +69,7 @@ long double calc_network_difficulty(const char *bits_hex);
unsigned char floorPoT(uint64_t x); unsigned char floorPoT(uint64_t x);
uint64_t datum_siphash(const void *src, uint64_t sz, const unsigned char key[16]); uint64_t datum_siphash(const void *src, uint64_t sz, const unsigned char key[16]);
uint64_t datum_siphash_mod8(const void *src, uint64_t sz, const unsigned char key[16]); uint64_t datum_siphash_mod8(const void *src, uint64_t sz, const unsigned char key[16]);
int datum_atoi_strict(const char *s, size_t size);
static inline static inline