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#include <ctype.h>
#include <stddef.h>
 
sizeptrdiff_t count_preceding_whitespace(const char *s) {
  const char *t = s;

  /* possibly *t < 0 */
  while (*t && isspace(*t)) {
    ++t;
  }
  return t - s;
}

#include <ctype.h>
#include <stddef.h>
 
sizeptrdiff_t count_preceding_whitespace(const char *s) {
  const char *t = s;

  while (*t && isspace((unsigned char)*t)) {
    ++t;
  }
  return t - s;
}