kc3-lang/gnulib/tests/test-rawmemchr.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-rawmemchr.c

• /*
   * Copyright (C) 2008-2023 Free Software Foundation, Inc.
   * Written by Eric Blake and Bruno Haible
   *
   * This program is free software: you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation, either version 3 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  #include <config.h>
  
  #include <string.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (rawmemchr, void *, (void const *, int));
  
  #include <stdlib.h>
  
  #include "zerosize-ptr.h"
  #include "macros.h"
  
  /* Calculating void * + int is not portable, so this wrapper converts
     to char * to make the tests easier to write.  */
  #define RAWMEMCHR (char *) rawmemchr
  
  int
  main (void)
  {
    size_t n = 0x100000;
    char *input = malloc (n + 1);
    ASSERT (input);
  
    input[0] = 'a';
    input[1] = 'b';
    memset (input + 2, 'c', 1024);
    memset (input + 1026, 'd', n - 1028);
    input[n - 2] = 'e';
    input[n - 1] = 'a';
    input[n] = '\0';
  
    /* Basic behavior tests.  */
    ASSERT (RAWMEMCHR (input, 'a') == input);
    ASSERT (RAWMEMCHR (input, 'b') == input + 1);
    ASSERT (RAWMEMCHR (input, 'c') == input + 2);
    ASSERT (RAWMEMCHR (input, 'd') == input + 1026);
  
    ASSERT (RAWMEMCHR (input + 1, 'a') == input + n - 1);
    ASSERT (RAWMEMCHR (input + 1, 'e') == input + n - 2);
    ASSERT (RAWMEMCHR (input + 1, 0x789abc00 | 'e') == input + n - 2);
  
    ASSERT (RAWMEMCHR (input, '\0') == input + n);
  
    /* Alignment tests.  */
    {
      int i, j;
      for (i = 0; i < 32; i++)
        {
          for (j = 0; j < 256; j++)
            input[i + j] = j;
          for (j = 0; j < 256; j++)
            {
              ASSERT (RAWMEMCHR (input + i, j) == input + i + j);
            }
        }
    }
  
    /* Ensure that no unaligned oversized reads occur.  */
    {
      char *page_boundary = (char *) zerosize_ptr ();
      size_t i;
  
      if (!page_boundary)
        page_boundary = input + 4096;
      memset (page_boundary - 512, '1', 511);
      page_boundary[-1] = '2';
      for (i = 1; i <= 512; i++)
        ASSERT (RAWMEMCHR (page_boundary - i, (i * 0x01010100) | '2')
                == page_boundary - 1);
    }
  
    free (input);
  
    return 0;
  }
  

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