numtools

perform numerical operations on vectors and matrices in unix pipes
git clone git://src.adamsgaard.dk/numtools # fast
git clone https://src.adamsgaard.dk/numtools.git # slow
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xreallocarray.c (287B)

      1 #include <err.h>
      2 #include <stdlib.h>
      3 
      4 void *
      5 xreallocarray(void *m, size_t n, size_t s)
      6 {
      7 	void *nm;
      8 
      9 	if (n == 0 || s == 0) {
     10 		free(m);
     11 		return NULL;
     12 	}
     13 	if (s && n > (size_t) - 1 / s)
     14 		err(1, "realloc: overflow");
     15 	if (!(nm = realloc(m, n * s)))
     16 		err(1, "realloc");
     17 
     18 	return nm;
     19 }