diplodocus.org Git - nmh/blob - test/getcwidth.c

   1 /*
   2  * getcwidth - Get the OS's idea of the width of a combining character
   3  *
   4  * This code is Copyright (c) 2012, by the authors of nmh.  See the
   5  * COPYRIGHT file in the root directory of the nmh distribution for
   6  * complete copyright information.
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <errno.h>
  13
  14 #ifdef HAVE_CONFIG_H
  15 #include <config.h>
  16 #endif
  17
  18 #ifdef MULTIBYTE_SUPPORT
  19 #include <locale.h>
  20 #include <wchar.h>
  21 #endif
  22
  23 int
  24 main(int argc, char *argv[])
  25 {
  26         wchar_t c;
  27         int charlen;
  28         char *p;
  29
  30         /*
  31          * This is the UTF-8 for "n" + U+0308 (Combining Diaeresis)
  32          */
  33
  34         unsigned char string[] = "n\xcc\x88";
  35
  36         setlocale(LC_ALL, "");
  37
  38         if (argc != 1) {
  39                 fprintf(stderr, "Usage: %s\n", argv[0]);
  40                 fprintf(stderr, "Returns the column width of a UTF-8 "
  41                         "multibyte character\n");
  42                 exit(1);
  43         }
  44
  45 #ifndef MULTIBYTE_SUPPORT
  46         fprintf(stderr, "Nmh was not configured with multibyte support\n");
  47         exit(1);
  48 #else
  49         /*
  50          * It's not clear to me that we can just call mbtowc() with a
  51          * combining character; just to be safe, feed it in a base
  52          * character first.
  53          */
  54
  55         mbtowc(NULL, NULL, 0);
  56
  57         charlen = mbtowc(&c, (char *) string, strlen((char *) string));
  58
  59         if (charlen != 1) {
  60                 fprintf(stderr, "We expected a beginning character length "
  61                         "of 1, got %d instead\n", charlen);
  62                 exit(1);
  63         }
  64
  65         p = (char *) (string + charlen);
  66
  67         charlen = mbtowc(&c, p, strlen(p));
  68
  69         if (charlen != 2) {
  70                 fprintf(stderr, "We expected a multibyte character length "
  71                         "of 2, got %d instead\n", charlen);
  72                 fprintf(stderr, "Are you using a UTF-8 locale?\n");
  73                 exit(1);
  74         }
  75
  76         printf("%d\n", wcwidth(c));
  77
  78         exit(0);
  79 #endif /* MULTIBYTE_SUPPORT */
  80 }