tests/test-strncat.c

   1 /* Test of strncat() function.
   2    Copyright (C) 2010-2025 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2010.  */
  18
  19 #include <config.h>
  20
  21 #include <string.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (strncat, char *, (char *, const char *, size_t));
  25
  26 #include <stdlib.h>
  27
  28 #include "zerosize-ptr.h"
  29 #include "macros.h"
  30
  31 /* Test the library, not the compiler+library.  */
  32 static char *
  33 lib_strncat (char *s1, char const *s2, size_t n)
  34 {
  35   return strncat (s1, s2, n);
  36 }
  37 static char *(*volatile volatile_strncat) (char *, char const *, size_t)
  38   = lib_strncat;
  39 #undef strncat
  40 #define strncat volatile_strncat
  41
  42 #define UNIT char
  43 #define U_STRNCAT strncat
  44 #define MAGIC ((char) 0xBA)
  45 #include "unistr/test-strncat.h"
  46
  47 int
  48 main ()
  49 {
  50   /* Simple string.  */
  51   { /* "Grüß Gott. Здравствуйте! x=(-b±sqrt(b²-4ac))/(2a)  日本語,中文,한글"
  52        in UTF-8 encoding.  */
  53     static const char input[] =
  54       { 'G', 'r', (char) 0xC3, (char) 0xBC, (char) 0xC3, (char) 0x9F, ' ',
  55         'G', 'o', 't', 't', '.', ' ', (char) 0xD0, (char) 0x97, (char) 0xD0,
  56         (char) 0xB4, (char) 0xD1, (char) 0x80, (char) 0xD0, (char) 0xB0,
  57         (char) 0xD0, (char) 0xB2, (char) 0xD1, (char) 0x81, (char) 0xD1,
  58         (char) 0x82, (char) 0xD0, (char) 0xB2, (char) 0xD1, (char) 0x83,
  59         (char) 0xD0, (char) 0xB9, (char) 0xD1, (char) 0x82, (char) 0xD0,
  60         (char) 0xB5, '!', ' ', 'x', '=', '(', '-', 'b', (char) 0xC2,
  61         (char) 0xB1, 's', 'q', 'r', 't', '(', 'b', (char) 0xC2, (char) 0xB2,
  62         '-', '4', 'a', 'c', ')', ')', '/', '(', '2', 'a', ')', ' ', ' ',
  63         (char) 0xE6, (char) 0x97, (char) 0xA5, (char) 0xE6, (char) 0x9C,
  64         (char) 0xAC, (char) 0xE8, (char) 0xAA, (char) 0x9E, ',', (char) 0xE4,
  65         (char) 0xB8, (char) 0xAD, (char) 0xE6, (char) 0x96, (char) 0x87, ',',
  66         (char) 0xED, (char) 0x95, (char) 0x9C, (char) 0xEA, (char) 0xB8,
  67         (char) 0x80, '\0'
  68       };
  69     check (input, SIZEOF (input));
  70   }
  71
  72   /* Test zero-length operations on NULL pointers, allowed by
  73      <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.  */
  74
  75 #if 0 /* I think this is invalid, per ISO C 23 § 7.26.3.2.  */
  76   ASSERT (strncat (NULL, "x", 0) == NULL);
  77 #endif
  78
  79   {
  80     char y[2] = { 'x', '\0' };
  81     ASSERT (strncat (y, NULL, 0) == y);
  82   }
  83
  84   return test_exit_status;
  85 }