Imported Debian patch 0.66.1-1

[hcoop/debian/courier-authlib.git] / libs / unicode / unicode_wcwidth.c

diff --git a/libs/unicode/unicode_wcwidth.c b/libs/unicode/unicode_wcwidth.c
new file mode 100644 (file)
index 0000000..372f7a7
--- /dev/null
+++ b/libs/unicode/unicode_wcwidth.c
@@ -0,0 +1,71 @@
+#include "unicode_config.h"
+#include "unicode.h"
+
+#include "eastasianwidth.h"
+#include "linebreaktab_internal.h"
+
+#include <stdlib.h>
+
+int unicode_wcwidth(unicode_char c)
+{
+       size_t b=0;
+       size_t e=sizeof(unicode_wcwidth_tab)/sizeof(unicode_wcwidth_tab[0]);
+
+       while (b < e)
+       {
+               size_t n=b + (e-b)/2;
+
+               if (c >= unicode_wcwidth_tab[n][0])
+               {
+                       if (c <= unicode_wcwidth_tab[n][1])
+                               return 2;
+                       b=n+1;
+               }
+               else
+               {
+                       e=n;
+               }
+       }
+
+       switch (unicode_lb_lookup(c)) {
+       case UNICODE_LB_BK:
+       case UNICODE_LB_CR:
+       case UNICODE_LB_LF:
+       case UNICODE_LB_CM:
+       case UNICODE_LB_NL:
+       case UNICODE_LB_WJ:
+       case UNICODE_LB_ZW:
+               return 0;
+       default:
+               break;
+       }
+       return 1;
+}
+
+int unicode_isspace(unicode_char ch)
+{
+       if (ch == 9)
+               return 1;
+
+       switch (unicode_lb_lookup(ch)) {
+       case UNICODE_LB_BK:
+       case UNICODE_LB_CR:
+       case UNICODE_LB_LF:
+       case UNICODE_LB_NL:
+       case UNICODE_LB_SP:
+               return 1;
+       }
+
+       return 0;
+}
+
+size_t unicode_wcwidth_str(const unicode_char *c)
+{
+       size_t w=0;
+
+       while (*c)
+               w += unicode_wcwidth(*c++);
+
+
+       return w;
+}