RDB's Unicode patch. Fonts are now used in Unicode mode where

[u/mdw/putty] / wcwidth.c

diff --git a/wcwidth.c b/wcwidth.c
new file mode 100644 (file)
index 0000000..8fa3ee2
--- /dev/null
+++ b/wcwidth.c
@@ -0,0 +1,190 @@
+/*
+ * This is an implementation of wcwidth() and wcswidth() as defined in
+ * "The Single UNIX Specification, Version 2, The Open Group, 1997"
+ * <http://www.UNIX-systems.org/online.html>
+ *
+ * Markus Kuhn -- 2000-02-08 -- public domain
+ */
+
+#include <wchar.h>
+
+/* These functions define the column width of an ISO 10646 character
+ * as follows:
+ *
+ *    - The null character (U+0000) has a column width of 0.
+ *
+ *    - Other C0/C1 control characters and DEL will lead to a return
+ *      value of -1.
+ *
+ *    - Non-spacing and enclosing combining characters (general
+ *      category code Mn or Me in the Unicode database) have a
+ *      column width of 0.
+ *
+ *    - Spacing characters in the East Asian Wide (W) or East Asian
+ *      FullWidth (F) category as defined in Unicode Technical
+ *      Report #11 have a column width of 2.
+ *
+ *    - All remaining characters (including all printable
+ *      ISO 8859-1 and WGL4 characters, Unicode control characters,
+ *      etc.) have a column width of 1.
+ *
+ * This implementation assumes that wchar_t characters are encoded
+ * in ISO 10646.
+ */
+
+int wcwidth(wchar_t ucs)
+{
+    /* sorted list of non-overlapping intervals of non-spacing characters */
+    static const struct interval {
+       unsigned short first;
+       unsigned short last;
+    } combining[] = {
+       {
+       0x0300, 0x034E}, {
+       0x0360, 0x0362}, {
+       0x0483, 0x0486}, {
+       0x0488, 0x0489}, {
+       0x0591, 0x05A1}, {
+       0x05A3, 0x05B9}, {
+       0x05BB, 0x05BD}, {
+       0x05BF, 0x05BF}, {
+       0x05C1, 0x05C2}, {
+       0x05C4, 0x05C4}, {
+       0x064B, 0x0655}, {
+       0x0670, 0x0670}, {
+       0x06D6, 0x06E4}, {
+       0x06E7, 0x06E8}, {
+       0x06EA, 0x06ED}, {
+       0x0711, 0x0711}, {
+       0x0730, 0x074A}, {
+       0x07A6, 0x07B0}, {
+       0x0901, 0x0902}, {
+       0x093C, 0x093C}, {
+       0x0941, 0x0948}, {
+       0x094D, 0x094D}, {
+       0x0951, 0x0954}, {
+       0x0962, 0x0963}, {
+       0x0981, 0x0981}, {
+       0x09BC, 0x09BC}, {
+       0x09C1, 0x09C4}, {
+       0x09CD, 0x09CD}, {
+       0x09E2, 0x09E3}, {
+       0x0A02, 0x0A02}, {
+       0x0A3C, 0x0A3C}, {
+       0x0A41, 0x0A42}, {
+       0x0A47, 0x0A48}, {
+       0x0A4B, 0x0A4D}, {
+       0x0A70, 0x0A71}, {
+       0x0A81, 0x0A82}, {
+       0x0ABC, 0x0ABC}, {
+       0x0AC1, 0x0AC5}, {
+       0x0AC7, 0x0AC8}, {
+       0x0ACD, 0x0ACD}, {
+       0x0B01, 0x0B01}, {
+       0x0B3C, 0x0B3C}, {
+       0x0B3F, 0x0B3F}, {
+       0x0B41, 0x0B43}, {
+       0x0B4D, 0x0B4D}, {
+       0x0B56, 0x0B56}, {
+       0x0B82, 0x0B82}, {
+       0x0BC0, 0x0BC0}, {
+       0x0BCD, 0x0BCD}, {
+       0x0C3E, 0x0C40}, {
+       0x0C46, 0x0C48}, {
+       0x0C4A, 0x0C4D}, {
+       0x0C55, 0x0C56}, {
+       0x0CBF, 0x0CBF}, {
+       0x0CC6, 0x0CC6}, {
+       0x0CCC, 0x0CCD}, {
+       0x0D41, 0x0D43}, {
+       0x0D4D, 0x0D4D}, {
+       0x0DCA, 0x0DCA}, {
+       0x0DD2, 0x0DD4}, {
+       0x0DD6, 0x0DD6}, {
+       0x0E31, 0x0E31}, {
+       0x0E34, 0x0E3A}, {
+       0x0E47, 0x0E4E}, {
+       0x0EB1, 0x0EB1}, {
+       0x0EB4, 0x0EB9}, {
+       0x0EBB, 0x0EBC}, {
+       0x0EC8, 0x0ECD}, {
+       0x0F18, 0x0F19}, {
+       0x0F35, 0x0F35}, {
+       0x0F37, 0x0F37}, {
+       0x0F39, 0x0F39}, {
+       0x0F71, 0x0F7E}, {
+       0x0F80, 0x0F84}, {
+       0x0F86, 0x0F87}, {
+       0x0F90, 0x0F97}, {
+       0x0F99, 0x0FBC}, {
+       0x0FC6, 0x0FC6}, {
+       0x102D, 0x1030}, {
+       0x1032, 0x1032}, {
+       0x1036, 0x1037}, {
+       0x1039, 0x1039}, {
+       0x1058, 0x1059}, {
+       0x17B7, 0x17BD}, {
+       0x17C6, 0x17C6}, {
+       0x17C9, 0x17D3}, {
+       0x18A9, 0x18A9}, {
+       0x20D0, 0x20E3}, {
+       0x302A, 0x302F}, {
+       0x3099, 0x309A}, {
+       0xFB1E, 0xFB1E}, {
+       0xFE20, 0xFE23}
+    };
+    int min = 0;
+    int max = sizeof(combining) / sizeof(struct interval) - 1;
+    int mid;
+
+    /* test for 8-bit control characters */
+    if (ucs == 0)
+       return 0;
+    if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
+       return -1;
+
+    /* first quick check for Latin-1 etc. characters */
+    if (ucs < combining[0].first)
+       return 1;
+
+    /* binary search in table of non-spacing characters */
+    while (max >= min) {
+       mid = (min + max) / 2;
+       if (combining[mid].last < ucs)
+           min = mid + 1;
+       else if (combining[mid].first > ucs)
+           max = mid - 1;
+       else if (combining[mid].first <= ucs && combining[mid].last >= ucs)
+           return 0;
+    }
+
+    /* if we arrive here, ucs is not a combining or C0/C1 control character */
+
+    /* fast test for majority of non-wide scripts */
+    if (ucs < 0x1100)
+       return 1;
+
+    return 1 + ((ucs >= 0x1100 && ucs <= 0x115f) ||    /* Hangul Jamo */
+               
+               (ucs >= 0x2e80 && ucs <= 0xa4cf
+                && (ucs & ~0x0011) != 0x300a && ucs != 0x303f) ||      /* CJK ... Yi */
+               (ucs >= 0xac00 && ucs <= 0xd7a3) ||     /* Hangul Syllables */
+               (ucs >= 0xf900 && ucs <= 0xfaff) ||     /* CJK Compatibility Ideographs */
+               (ucs >= 0xfe30 && ucs <= 0xfe6f) ||     /* CJK Compatibility Forms */
+               (ucs >= 0xff00 && ucs <= 0xff5f) ||     /* Fullwidth Forms */
+               (ucs >= 0xffe0 && ucs <= 0xffe6));
+}
+
+
+int wcswidth(const wchar_t * pwcs, size_t n)
+{
+    int w, width = 0;
+
+    for (; *pwcs && n-- > 0; pwcs++)
+       if ((w = wcwidth(*pwcs)) < 0)
+           return -1;
+       else
+           width += w;
+
+    return width;
+}