1/* MIT License
2 *
3 * Copyright (c) 1998 Massachusetts Institute of Technology
4 * Copyright (c) The c-ares project and its contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * SPDX-License-Identifier: MIT
26 */
27
28#include "ares_setup.h"
29#include "ares_strcasecmp.h"
30
31#ifndef HAVE_STRCASECMP
32int ares_strcasecmp(const char *a, const char *b)
33{
34#  if defined(HAVE_STRCMPI)
35  return strcmpi(a, b);
36#  elif defined(HAVE_STRICMP)
37  return stricmp(a, b);
38#  else
39  size_t i;
40
41  for (i = 0; i < (size_t)-1; i++) {
42    int c1 = ISUPPER(a[i]) ? tolower(a[i]) : a[i];
43    int c2 = ISUPPER(b[i]) ? tolower(b[i]) : b[i];
44    if (c1 != c2) {
45      return c1 - c2;
46    }
47    if (!c1) {
48      break;
49    }
50  }
51  return 0;
52#  endif
53}
54#endif
55
56#ifndef HAVE_STRNCASECMP
57int ares_strncasecmp(const char *a, const char *b, size_t n)
58{
59#  if defined(HAVE_STRNCMPI)
60  return strncmpi(a, b, n);
61#  elif defined(HAVE_STRNICMP)
62  return strnicmp(a, b, n);
63#  else
64  size_t i;
65
66  for (i = 0; i < n; i++) {
67    int c1 = ISUPPER(a[i]) ? tolower(a[i]) : a[i];
68    int c2 = ISUPPER(b[i]) ? tolower(b[i]) : b[i];
69    if (c1 != c2) {
70      return c1 - c2;
71    }
72    if (!c1) {
73      break;
74    }
75  }
76  return 0;
77#  endif
78}
79#endif
80