18/02/27 10:55:55.07 XfJ/ct090.net
できた
void dim_alloc(size_t, size_t, char (**b)[*]);
int main(void)
{
size_t width = 3, height = 4;
char (*a)[width];
dim_alloc(width, height, &a);
}
void dim_alloc(size_t width, size_t height, char (**b)[width])
{
*b = (char (*)[width])malloc(width * height);
}
これならおｋ