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Document the calloc function overflow check.

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Mansour Moufid 2014-10-19 13:12:11 -04:00 committed by Nick Mathewson
parent 06b1ef7b76
commit 81b452d245
1 changed files with 4 additions and 0 deletions
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4
src/common/util.c
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@ -195,8 +195,10 @@ tor_malloc_zero_(size_t size DMALLOC_PARAMS)
return result; return result;
} }
/* Estimate the square root of SIZE_MAX. */
#define SQRT_SIZE_MAX (((size_t) SIZE_MAX) >> (sizeof(size_t) * 8 / 2)) #define SQRT_SIZE_MAX (((size_t) SIZE_MAX) >> (sizeof(size_t) * 8 / 2))
/** Return non-zero if and only if the product of the arguments is exact. */
static INLINE int static INLINE int
size_mul_check(const size_t x, const size_t y) size_mul_check(const size_t x, const size_t y)
{ {
@ -208,6 +210,8 @@ size_mul_check(const size_t x, const size_t y)
* the memory with zero bytes, and return a pointer to the result. * the memory with zero bytes, and return a pointer to the result.
* Log and terminate the process on error. (Same as * Log and terminate the process on error. (Same as
* calloc(<b>nmemb</b>,<b>size</b>), but never returns NULL.) * calloc(<b>nmemb</b>,<b>size</b>), but never returns NULL.)
* The second argument (<b>size</b>) should preferably be non-zero
* and a compile-time constant.
*/ */
void * void *
tor_calloc_(size_t nmemb, size_t size DMALLOC_PARAMS) tor_calloc_(size_t nmemb, size_t size DMALLOC_PARAMS)