/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "plstr.h"
#include <string.h>

PR_IMPLEMENT(char*)
PL_strchr(const char* s, char c) {
  if ((const char*)0 == s) {
    return (char*)0;
  }

  return strchr(s, c);
}

PR_IMPLEMENT(char*)
PL_strrchr(const char* s, char c) {
  if ((const char*)0 == s) {
    return (char*)0;
  }

  return strrchr(s, c);
}

PR_IMPLEMENT(char*)
PL_strnchr(const char* s, char c, PRUint32 n) {
  if ((const char*)0 == s) {
    return (char*)0;
  }

  for (; n && *s; s++, n--)
    if (*s == c) {
      return (char*)s;
    }

  if (((char)0 == c) && (n > 0) && ((char)0 == *s)) {
    return (char*)s;
  }

  return (char*)0;
}

PR_IMPLEMENT(char*)
PL_strnrchr(const char* s, char c, PRUint32 n) {
  const char* p;

  if ((const char*)0 == s) {
    return (char*)0;
  }

  for (p = s; n && *p; p++, n--);

  if (((char)0 == c) && (n > 0) && ((char)0 == *p)) {
    return (char*)p;
  }

  for (p--; p >= s; p--)
    if (*p == c) {
      return (char*)p;
    }

  return (char*)0;
}