LXR busybox/libbb/safe

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Utility routines.
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9
  10#include "libbb.h"
  11
  12/* Like strncpy but make sure the resulting string is always 0 terminated. */
  13char* FAST_FUNC safe_strncpy(char *dst, const char *src, size_t size)
  14{
  15        if (!size) return dst;
  16        dst[--size] = '\0';
  17        return strncpy(dst, src, size);
  18}
  19
  20/* Like strcpy but can copy overlapping strings. */
  21void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
  22{
  23        /* Cheap optimization for dst == src case -
  24         * better to have it here than in many callers.
  25         */
  26        if (dst != src) {
  27                while ((*dst = *src) != '\0') {
  28                        dst++;
  29                        src++;
  30                }
  31        }
  32}
  33