1  /* Test collation function using real data.
       2     Copyright (C) 1997-2023 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     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <ctype.h>
      20  #include <error.h>
      21  #include <locale.h>
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  #include <string.h>
      25  
      26  
      27  struct lines
      28  {
      29    char *key;
      30    char *line;
      31  };
      32  
      33  static int xstrcoll (const void *, const void *);
      34  
      35  static int
      36  signum (int n)
      37  {
      38    return (0 < n) - (n < 0);
      39  }
      40  
      41  int
      42  main (int argc, char *argv[])
      43  {
      44    int result = 0;
      45    size_t nstrings, nstrings_max;
      46    struct lines *strings;
      47    char *line = NULL;
      48    size_t len = 0;
      49    size_t n;
      50  
      51    if (argc < 2)
      52      error (1, 0, "usage: %s <random seed>", argv[0]);
      53  
      54    setlocale (LC_ALL, "");
      55  
      56    nstrings_max = 100;
      57    nstrings = 0;
      58    strings = (struct lines *) malloc (nstrings_max * sizeof (struct lines));
      59    if (strings == NULL)
      60      {
      61        perror (argv[0]);
      62        exit (1);
      63      }
      64  
      65    while (1)
      66      {
      67        int l;
      68        if (getline (&line, &len, stdin) < 0)
      69  	break;
      70  
      71        if (nstrings == nstrings_max)
      72  	{
      73  	  strings = (struct lines *) realloc (strings,
      74  					      (nstrings_max *= 2)
      75  					       * sizeof (*strings));
      76  	  if (strings == NULL)
      77  	    {
      78  	      perror (argv[0]);
      79  	      exit (1);
      80  	    }
      81  	}
      82        strings[nstrings].line = strdup (line);
      83        l = strcspn (line, ":(;");
      84        while (l > 0 && isspace (line[l - 1]))
      85  	--l;
      86        strings[nstrings].key = strndup (line, l);
      87        ++nstrings;
      88      }
      89    free (line);
      90  
      91    /* First shuffle.  */
      92    srandom (atoi (argv[1]));
      93    for (n = 0; n < 10 * nstrings; ++n)
      94      {
      95        int r1, r2;
      96        size_t idx1 = random () % nstrings;
      97        size_t idx2 = random () % nstrings;
      98        struct lines tmp = strings[idx1];
      99        strings[idx1] = strings[idx2];
     100        strings[idx2] = tmp;
     101  
     102        /* While we are at it a first little test.  */
     103        r1 = strcoll (strings[idx1].key, strings[idx2].key);
     104        r2 = strcoll (strings[idx2].key, strings[idx1].key);
     105  
     106        if (signum (r1) != - signum (r2))
     107  	printf ("`%s' and `%s' collate wrong: %d vs. %d\n",
     108  		strings[idx1].key, strings[idx2].key, r1, r2);
     109      }
     110  
     111    /* Now sort.  */
     112    qsort (strings, nstrings, sizeof (struct lines), xstrcoll);
     113  
     114    /* Print the result.  */
     115    for (n = 0; n < nstrings; ++n)
     116      {
     117        fputs (strings[n].line, stdout);
     118        free (strings[n].line);
     119        free (strings[n].key);
     120      }
     121    free (strings);
     122  
     123    return result;
     124  }
     125  
     126  
     127  static int
     128  xstrcoll (const void *ptr1, const void *ptr2)
     129  {
     130    const struct lines *l1 = (const struct lines *) ptr1;
     131    const struct lines *l2 = (const struct lines *) ptr2;
     132  
     133    return strcoll (l1->key, l2->key);
     134  }