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/* These are some dynamic memory allocation facilities. They are essentially an extension to C, as they do allocations with a cognizance of C variables. You can use them to make C read more like a high level language. */ #ifndef MALLOCVAR_INCLUDED #define MALLOCVAR_INCLUDED #include "pm_config.h" #include <limits.h> #include <stdlib.h> static __inline__ void * mallocProduct(unsigned int const factor1, unsigned int const factor2) { /*---------------------------------------------------------------------------- malloc a space whose size in bytes is the product of 'factor1' and 'factor2'. But if that size cannot be represented as an unsigned int, return NULL without allocating anything. Also return NULL if the malloc fails. Note that malloc() actually takes a size_t size argument, so the proper test would be whether the size can be represented by size_t, not unsigned int. But there is no reliable indication available to us, like UINT_MAX, of what the limitations of size_t are. We assume size_t is at least as expressive as unsigned int and that nobody really needs to allocate more than 4GB of memory. -----------------------------------------------------------------------------*/ if (UINT_MAX / factor2 < factor1) return NULL; else return malloc(factor1 * factor2); } static __inline__ void reallocProduct(void ** const blockP, unsigned int const factor1, unsigned int const factor2) { if (UINT_MAX / factor2 < factor1) *blockP = NULL; \ else *blockP = realloc(*blockP, factor1 * factor2); } #define MALLOCARRAY(arrayName, nElements) \ (arrayName = mallocProduct(nElements, sizeof(arrayName[0]))) #define REALLOCARRAY(arrayName, nElements) \ reallocProduct((void **)&arrayName, nElements, sizeof(arrayName[0])) #define MALLOCARRAY_NOFAIL(arrayName, nElements) \ do { \ MALLOCARRAY(arrayName, nElements); \ if ((arrayName) == NULL) \ abort(); \ } while(0) #define REALLOCARRAY_NOFAIL(arrayName, nElements) \ do { \ REALLOCARRAY(arrayName, nElements); \ if ((arrayName) == NULL) \ abort(); \ } while(0) #define MALLOCVAR(varName) \ varName = malloc(sizeof(*varName)) #define MALLOCVAR_NOFAIL(varName) \ do {if ((varName = malloc(sizeof(*varName))) == NULL) abort();} while(0) #endif