string/test-stpncpy.c

   1 /* Test and measure stpncpy functions.
   2    Copyright (C) 1999-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Jakub Jelinek <jakub@redhat.com>, 1999.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #define STRNCPY_RESULT(dst, len, n) ((dst) + ((len) > (n) ? (n) : (len)))
  21 #define TEST_MAIN
  22 #define TEST_NAME "stpncpy"
  23 #include "test-string.h"
  24
  25 char *simple_stpncpy (char *, const char *, size_t);
  26 char *stupid_stpncpy (char *, const char *, size_t);
  27
  28 IMPL (stupid_stpncpy, 0)
  29 IMPL (simple_stpncpy, 0)
  30 IMPL (stpncpy, 1)
  31
  32 char *
  33 simple_stpncpy (char *dst, const char *src, size_t n)
  34 {
  35   while (n--)
  36     if ((*dst++ = *src++) == '\0')
  37       {
  38         size_t i;
  39
  40         for (i = 0; i < n; ++i)
  41           dst[i] = '\0';
  42         return dst - 1;
  43       }
  44   return dst;
  45 }
  46
  47 char *
  48 stupid_stpncpy (char *dst, const char *src, size_t n)
  49 {
  50   size_t nc = strnlen (src, n);
  51   size_t i;
  52
  53   for (i = 0; i < nc; ++i)
  54     dst[i] = src[i];
  55   for (; i < n; ++i)
  56     dst[i] = '\0';
  57   return dst + nc;
  58 }
  59
  60 #include "test-strncpy.c"