benchtests/bench-stpncpy.c

   1 /* Measure stpncpy functions.
   2    Copyright (C) 2013-2015 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #define STRNCPY_RESULT(dst, len, n) ((dst) + ((len) > (n) ? (n) : (len)))
  20 #define TEST_MAIN
  21 #define TEST_NAME "stpncpy"
  22 #include "bench-string.h"
  23
  24 char *simple_stpncpy (char *, const char *, size_t);
  25 char *stupid_stpncpy (char *, const char *, size_t);
  26
  27 IMPL (stupid_stpncpy, 0)
  28 IMPL (simple_stpncpy, 0)
  29 IMPL (stpncpy, 1)
  30
  31 char *
  32 simple_stpncpy (char *dst, const char *src, size_t n)
  33 {
  34   while (n--)
  35     if ((*dst++ = *src++) == '\0')
  36       {
  37         size_t i;
  38
  39         for (i = 0; i < n; ++i)
  40           dst[i] = '\0';
  41         return dst - 1;
  42       }
  43   return dst;
  44 }
  45
  46 char *
  47 stupid_stpncpy (char *dst, const char *src, size_t n)
  48 {
  49   size_t nc = strnlen (src, n);
  50   size_t i;
  51
  52   for (i = 0; i < nc; ++i)
  53     dst[i] = src[i];
  54   for (; i < n; ++i)
  55     dst[i] = '\0';
  56   return dst + nc;
  57 }
  58
  59 #include "bench-strncpy.c"