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enum { N = 16 };
widget *p;
/* ... */
p = MALLOC_ARRAY(N, widget); /* OK */
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A small collection of macros can provide secure implementations for common uses for the standard memory allocation functions. The omission of a {{REALLOC()}} macro is intentional (see \[[MEM08-A. Use realloc() only to resize dynamically allocated arrays]\]).
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/* allocates a single object using malloc(). */
#define MALLOC(type) ((type *)malloc(sizeof(type)))
/* allocates an array of objects using malloc(). */
#define MALLOC_ARRAY(number, type) \
((type *)malloc((number) * sizeof(type)))
/* allocates a single object with a flexible
* array member using malloc(). */
#define MALLOC_FLEX(stype, number, etype) \
((stype *)malloc(sizeof(stype) \
+ (number) * sizeof(etype)))
/* allocates an array of objects using calloc(). */
#define CALLOC(number, type) \
((type *)calloc(number, sizeof(type)))
/* reallocates an array of objects using realloc(). */
#define REALLOC_ARRAY(pointer, number, type) \
((type *)realloc(pointer, (number) * sizeof(type)))
/* reallocates a single object with a flexible
* array member using realloc(). */
#define REALLOC_FLEX(pointer, stype, number, etype) \
((stype *)realloc(pointer, sizeof(stype) \
+ (number) * sizeof(etype)))
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