libs/unicode/unicode_wcwidth.c

   1 #include "unicode_config.h"
   2 #include "unicode.h"
   3
   4 #include "eastasianwidth.h"
   5 #include "linebreaktab_internal.h"
   6
   7 #include <stdlib.h>
   8
   9 int unicode_wcwidth(unicode_char c)
  10 {
  11         size_t b=0;
  12         size_t e=sizeof(unicode_wcwidth_tab)/sizeof(unicode_wcwidth_tab[0]);
  13
  14         while (b < e)
  15         {
  16                 size_t n=b + (e-b)/2;
  17
  18                 if (c >= unicode_wcwidth_tab[n][0])
  19                 {
  20                         if (c <= unicode_wcwidth_tab[n][1])
  21                                 return 2;
  22                         b=n+1;
  23                 }
  24                 else
  25                 {
  26                         e=n;
  27                 }
  28         }
  29
  30         switch (unicode_lb_lookup(c)) {
  31         case UNICODE_LB_BK:
  32         case UNICODE_LB_CR:
  33         case UNICODE_LB_LF:
  34         case UNICODE_LB_CM:
  35         case UNICODE_LB_NL:
  36         case UNICODE_LB_WJ:
  37         case UNICODE_LB_ZW:
  38                 return 0;
  39         default:
  40                 break;
  41         }
  42         return 1;
  43 }
  44
  45 int unicode_isspace(unicode_char ch)
  46 {
  47         if (ch == 9)
  48                 return 1;
  49
  50         switch (unicode_lb_lookup(ch)) {
  51         case UNICODE_LB_BK:
  52         case UNICODE_LB_CR:
  53         case UNICODE_LB_LF:
  54         case UNICODE_LB_NL:
  55         case UNICODE_LB_SP:
  56                 return 1;
  57         }
  58
  59         return 0;
  60 }
  61
  62 size_t unicode_wcwidth_str(const unicode_char *c)
  63 {
  64         size_t w=0;
  65
  66         while (*c)
  67                 w += unicode_wcwidth(*c++);
  68
  69
  70         return w;
  71 }