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#include "libbb.h"
  10
  11/* Like strncpy but make sure the resulting string is always 0 terminated. */
  12char* FAST_FUNC safe_strncpy(char *dst, const char *src, size_t size)
  13{
  14        if (!size) return dst;
  15        dst[--size] = '\0';
  16        return strncpy(dst, src, size);
  17}
  18
  19/* Like strcpy but can copy overlapping strings. */
  20void FAST_FUNC overlapping_strcpy(char *dst, const char *src)
  21{
  22        /* Cheap optimization for dst == src case -
  23         * better to have it here than in many callers.
  24         */
  25        if (dst != src) {
  26                while ((*dst = *src) != '\0') {
  27                        dst++;
  28                        src++;
  29                }
  30        }
  31}
  32