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Add os_calloc() wrapper 

This function can be used as a wrapper for os_zalloc(nmemb * size) when
an allocation is used for an array. The main benefit over os_zalloc() is
in having an extra check to catch integer overflows in multiplication.

Signed-hostap: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2012-08-13 20:42:24 +03:00
parent 78372bda68
commit 64a2f2ece1
1 changed files with 19 additions and 0 deletions
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19
src/utils/os.h
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@ -180,6 +180,25 @@ char * os_readfile(const char *name, size_t *len);
*/
void * os_zalloc(size_t size);
/**
* os_calloc - Allocate and zero memory for an array
* @nmemb: Number of members in the array
* @size: Number of bytes in each member
* Returns: Pointer to allocated and zeroed memory or %NULL on failure
*
* This function can be used as a wrapper for os_zalloc(nmemb * size) when an
* allocation is used for an array. The main benefit over os_zalloc() is in
* having an extra check to catch integer overflows in multiplication.
*
* Caller is responsible for freeing the returned buffer with os_free().
*/
static inline void * os_calloc(size_t nmemb, size_t size)
{
if (size && nmemb > (~(size_t) 0) / size)
return NULL;
return os_zalloc(nmemb * size);
}
/*
* The following functions are wrapper for standard ANSI C or POSIX functions.