lib/unicase/u8-tolower.c

   1 /* Lowercase mapping for UTF-8 strings (locale dependent).
   2    Copyright (C) 2009-2020 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2009.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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 License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unicase.h"
  22
  23 #include <stddef.h>
  24
  25 #include "unicase/unicasemap.h"
  26 #include "unicase/special-casing.h"
  27
  28 uint8_t *
  29 u8_tolower (const uint8_t *s, size_t n, const char *iso639_language,
  30             uninorm_t nf,
  31             uint8_t *resultbuf, size_t *lengthp)
  32 {
  33   return u8_casemap (s, n,
  34                      unicase_empty_prefix_context, unicase_empty_suffix_context,
  35                      iso639_language,
  36                      uc_tolower, offsetof (struct special_casing_rule, lower[0]),
  37                      nf,
  38                      resultbuf, lengthp);
  39 }
  40
  41
  42 #ifdef TEST
  43
  44 #include <locale.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 /* Read the contents of an input stream, and return it, terminated with a NUL
  50    byte. */
  51 char *
  52 read_file (FILE *stream)
  53 {
  54 #define BUFSIZE 4096
  55   char *buf = NULL;
  56   int alloc = 0;
  57   int size = 0;
  58   int count;
  59
  60   while (! feof (stream))
  61     {
  62       if (size + BUFSIZE > alloc)
  63         {
  64           alloc = alloc + alloc / 2;
  65           if (alloc < size + BUFSIZE)
  66             alloc = size + BUFSIZE;
  67           buf = realloc (buf, alloc);
  68           if (buf == NULL)
  69             {
  70               fprintf (stderr, "out of memory\n");
  71               exit (1);
  72             }
  73         }
  74       count = fread (buf + size, 1, BUFSIZE, stream);
  75       if (count == 0)
  76         {
  77           if (ferror (stream))
  78             {
  79               perror ("fread");
  80               exit (1);
  81             }
  82         }
  83       else
  84         size += count;
  85     }
  86   buf = realloc (buf, size + 1);
  87   if (buf == NULL)
  88     {
  89       fprintf (stderr, "out of memory\n");
  90       exit (1);
  91     }
  92   buf[size] = '\0';
  93   return buf;
  94 #undef BUFSIZE
  95 }
  96
  97 int
  98 main (int argc, char * argv[])
  99 {
 100   setlocale (LC_ALL, "");
 101   if (argc == 1)
 102     {
 103       /* Display the lower case of the input string.  */
 104       char *input = read_file (stdin);
 105       int length = strlen (input);
 106       size_t output_length;
 107       uint8_t *output =
 108         u8_tolower ((uint8_t *) input, length, uc_locale_language (),
 109                     NULL,
 110                     NULL, &output_length);
 111
 112       fwrite (output, 1, output_length, stdout);
 113
 114       return 0;
 115     }
 116   else
 117     return 1;
 118 }
 119
 120 #endif /* TEST */