strrpos

The strrpos function searches string for the last occurrence of c. The null character terminating string is included in the search.

The strrpos function returns the index of the last character matching c in string or a value of -1 if no matching character was found. The index of the first character in string is 0.

strchr, strcspn, strpbrk, strpos, strrchr, strrpbrk, strspn

#include <string.h>
#include <stdio.h> /* for printf */

void tst_strrpos (const char *s) {
  int i;

  i = strrpos (s, ' ');

  if (i == -1)
    printf ("No spaces found in %s\n", s);
  else
    printf ("Last space in %s is at offset %d\n", s, i);
}