Add a "fork" of musl as //fusl.

fusl/src/ctype/towctrans.c

+#include <wctype.h>
+#include "libc.h"
+
+#define CASEMAP(u1,u2,l) { (u1), (l)-(u1), (u2)-(u1)+1 }
+#define CASELACE(u1,u2) CASEMAP((u1),(u2),(u1)+1)
+
+static const struct {
+        unsigned short upper;
+        signed char lower;
+        unsigned char len;
+} casemaps[] = {
+        CASEMAP('A','Z','a'),
+        CASEMAP(0xc0,0xde,0xe0),
+
+        CASELACE(0x0100,0x012e),
+        CASELACE(0x0132,0x0136),
+        CASELACE(0x0139,0x0147),
+        CASELACE(0x014a,0x0176),
+        CASELACE(0x0179,0x017d),
+
+        CASELACE(0x370,0x372),
+        CASEMAP(0x391,0x3a1,0x3b1),
+        CASEMAP(0x3a3,0x3ab,0x3c3),
+        CASEMAP(0x400,0x40f,0x450),
+        CASEMAP(0x410,0x42f,0x430),
+
+        CASELACE(0x460,0x480),
+        CASELACE(0x48a,0x4be),
+        CASELACE(0x4c1,0x4cd),
+        CASELACE(0x4d0,0x50e),
+
+        CASELACE(0x514,0x526),
+        CASEMAP(0x531,0x556,0x561),
+
+        CASELACE(0x01a0,0x01a4),
+        CASELACE(0x01b3,0x01b5),
+        CASELACE(0x01cd,0x01db),
+        CASELACE(0x01de,0x01ee),
+        CASELACE(0x01f8,0x021e),
+        CASELACE(0x0222,0x0232),
+        CASELACE(0x03d8,0x03ee),
+
+        CASELACE(0x1e00,0x1e94),
+        CASELACE(0x1ea0,0x1efe),
+
+        CASEMAP(0x1f08,0x1f0f,0x1f00),
+        CASEMAP(0x1f18,0x1f1d,0x1f10),
+        CASEMAP(0x1f28,0x1f2f,0x1f20),
+        CASEMAP(0x1f38,0x1f3f,0x1f30),
+        CASEMAP(0x1f48,0x1f4d,0x1f40),
+
+        CASEMAP(0x1f68,0x1f6f,0x1f60),
+        CASEMAP(0x1f88,0x1f8f,0x1f80),
+        CASEMAP(0x1f98,0x1f9f,0x1f90),
+        CASEMAP(0x1fa8,0x1faf,0x1fa0),
+        CASEMAP(0x1fb8,0x1fb9,0x1fb0),
+        CASEMAP(0x1fba,0x1fbb,0x1f70),
+        CASEMAP(0x1fc8,0x1fcb,0x1f72),
+        CASEMAP(0x1fd8,0x1fd9,0x1fd0),
+        CASEMAP(0x1fda,0x1fdb,0x1f76),
+        CASEMAP(0x1fe8,0x1fe9,0x1fe0),
+        CASEMAP(0x1fea,0x1feb,0x1f7a),
+        CASEMAP(0x1ff8,0x1ff9,0x1f78),
+        CASEMAP(0x1ffa,0x1ffb,0x1f7c),
+
+        CASELACE(0x246,0x24e),
+        CASELACE(0x510,0x512),
+        CASEMAP(0x2160,0x216f,0x2170),
+        CASEMAP(0x2c00,0x2c2e,0x2c30),
+        CASELACE(0x2c67,0x2c6b),
+        CASELACE(0x2c80,0x2ce2),
+        CASELACE(0x2ceb,0x2ced),
+
+        CASELACE(0xa640,0xa66c),
+        CASELACE(0xa680,0xa696),
+
+        CASELACE(0xa722,0xa72e),
+        CASELACE(0xa732,0xa76e),
+        CASELACE(0xa779,0xa77b),
+        CASELACE(0xa77e,0xa786),
+
+        CASELACE(0xa790,0xa792),
+        CASELACE(0xa7a0,0xa7a8),
+
+        CASEMAP(0xff21,0xff3a,0xff41),
+        { 0,0,0 }
+};
+
+static const unsigned short pairs[][2] = {
+        { 'I',    0x0131 },
+        { 'S',    0x017f },
+        { 0x0130, 'i'    },
+        { 0x0178, 0x00ff },
+        { 0x0181, 0x0253 },
+        { 0x0182, 0x0183 },
+        { 0x0184, 0x0185 },
+        { 0x0186, 0x0254 },
+        { 0x0187, 0x0188 },
+        { 0x0189, 0x0256 },
+        { 0x018a, 0x0257 },
+        { 0x018b, 0x018c },
+        { 0x018e, 0x01dd },
+        { 0x018f, 0x0259 },
+        { 0x0190, 0x025b },
+        { 0x0191, 0x0192 },
+        { 0x0193, 0x0260 },
+        { 0x0194, 0x0263 },
+        { 0x0196, 0x0269 },
+        { 0x0197, 0x0268 },
+        { 0x0198, 0x0199 },
+        { 0x019c, 0x026f },
+        { 0x019d, 0x0272 },
+        { 0x019f, 0x0275 },
+        { 0x01a6, 0x0280 },
+        { 0x01a7, 0x01a8 },
+        { 0x01a9, 0x0283 },
+        { 0x01ac, 0x01ad },
+        { 0x01ae, 0x0288 },
+        { 0x01af, 0x01b0 },
+        { 0x01b1, 0x028a },
+        { 0x01b2, 0x028b },
+        { 0x01b7, 0x0292 },
+        { 0x01b8, 0x01b9 },
+        { 0x01bc, 0x01bd },
+        { 0x01c4, 0x01c6 },
+        { 0x01c4, 0x01c5 },
+        { 0x01c5, 0x01c6 },
+        { 0x01c7, 0x01c9 },
+        { 0x01c7, 0x01c8 },
+        { 0x01c8, 0x01c9 },
+        { 0x01ca, 0x01cc },
+        { 0x01ca, 0x01cb },
+        { 0x01cb, 0x01cc },
+        { 0x01f1, 0x01f3 },
+        { 0x01f1, 0x01f2 },
+        { 0x01f2, 0x01f3 },
+        { 0x01f4, 0x01f5 },
+        { 0x01f6, 0x0195 },
+        { 0x01f7, 0x01bf },
+        { 0x0220, 0x019e },
+        { 0x0386, 0x03ac },
+        { 0x0388, 0x03ad },
+        { 0x0389, 0x03ae },
+        { 0x038a, 0x03af },
+        { 0x038c, 0x03cc },
+        { 0x038e, 0x03cd },
+        { 0x038f, 0x03ce },
+        { 0x0399, 0x0345 },
+        { 0x0399, 0x1fbe },
+        { 0x03a3, 0x03c2 },
+        { 0x03f7, 0x03f8 },
+        { 0x03fa, 0x03fb },
+        { 0x1e60, 0x1e9b },
+        { 0x1e9e, 0xdf },
+
+        { 0x1f59, 0x1f51 },
+        { 0x1f5b, 0x1f53 },
+        { 0x1f5d, 0x1f55 },
+        { 0x1f5f, 0x1f57 },
+        { 0x1fbc, 0x1fb3 },
+        { 0x1fcc, 0x1fc3 },
+        { 0x1fec, 0x1fe5 },
+        { 0x1ffc, 0x1ff3 },
+
+        { 0x23a, 0x2c65 },
+        { 0x23b, 0x23c },
+        { 0x23d, 0x19a },
+        { 0x23e, 0x2c66 },
+        { 0x241, 0x242 },
+        { 0x243, 0x180 },
+        { 0x244, 0x289 },
+        { 0x245, 0x28c },
+        { 0x3f4, 0x3b8 },
+        { 0x3f9, 0x3f2 },
+        { 0x3fd, 0x37b },
+        { 0x3fe, 0x37c },
+        { 0x3ff, 0x37d },
+        { 0x4c0, 0x4cf },
+
+        { 0x2126, 0x3c9 },
+        { 0x212a, 'k' },
+        { 0x212b, 0xe5 },
+        { 0x2132, 0x214e },
+        { 0x2183, 0x2184 },
+        { 0x2c60, 0x2c61 },
+        { 0x2c62, 0x26b },
+        { 0x2c63, 0x1d7d },
+        { 0x2c64, 0x27d },
+        { 0x2c6d, 0x251 },
+        { 0x2c6e, 0x271 },
+        { 0x2c6f, 0x250 },
+        { 0x2c70, 0x252 },
+        { 0x2c72, 0x2c73 },
+        { 0x2c75, 0x2c76 },
+        { 0x2c7e, 0x23f },
+        { 0x2c7f, 0x240 },
+        { 0x2cf2, 0x2cf3 },
+
+        { 0xa77d, 0x1d79 },
+        { 0xa78b, 0xa78c },
+        { 0xa78d, 0x265 },
+        { 0xa7aa, 0x266 },
+
+        { 0x10c7, 0x2d27 },
+        { 0x10cd, 0x2d2d },
+
+        /* bogus greek 'symbol' letters */
+        { 0x376, 0x377 },
+        { 0x39c, 0xb5 },
+        { 0x392, 0x3d0 },
+        { 0x398, 0x3d1 },
+        { 0x3a6, 0x3d5 },
+        { 0x3a0, 0x3d6 },
+        { 0x39a, 0x3f0 },
+        { 0x3a1, 0x3f1 },
+        { 0x395, 0x3f5 },
+        { 0x3cf, 0x3d7 },
+
+        { 0,0 }
+};
+
+
+static wchar_t __towcase(wchar_t wc, int lower)
+{
+        int i;
+        int lmul = 2*lower-1;
+        int lmask = lower-1;
+        /* no letters with case in these large ranges */
+        if (!iswalpha(wc)
+         || (unsigned)wc - 0x0600 <= 0x0fff-0x0600
+         || (unsigned)wc - 0x2e00 <= 0xa63f-0x2e00
+         || (unsigned)wc - 0xa800 <= 0xfeff-0xa800)
+                return wc;
+        /* special case because the diff between upper/lower is too big */
+        if (lower && (unsigned)wc - 0x10a0 < 0x2e)
+                if (wc>0x10c5 && wc != 0x10c7 && wc != 0x10cd) return wc;
+                else return wc + 0x2d00 - 0x10a0;
+        if (!lower && (unsigned)wc - 0x2d00 < 0x26)
+                if (wc>0x2d25 && wc != 0x2d27 && wc != 0x2d2d) return wc;
+                else return wc + 0x10a0 - 0x2d00;
+        for (i=0; casemaps[i].len; i++) {
+                int base = casemaps[i].upper + (lmask & casemaps[i].lower);
+                if ((unsigned)wc-base < casemaps[i].len) {
+                        if (casemaps[i].lower == 1)
+                                return wc + lower - ((wc-casemaps[i].upper)&1);
+                        return wc + lmul*casemaps[i].lower;
+                }
+        }
+        for (i=0; pairs[i][1-lower]; i++) {
+                if (pairs[i][1-lower] == wc)
+                        return pairs[i][lower];
+        }
+        if ((unsigned)wc - (0x10428 - 0x28*lower) < 0x28)
+                return wc - 0x28 + 0x50*lower;
+        return wc;
+}
+
+wint_t towupper(wint_t wc)
+{
+        return __towcase(wc, 0);
+}
+
+wint_t towlower(wint_t wc)
+{
+        return __towcase(wc, 1);
+}
+
+wint_t __towupper_l(wint_t c, locale_t l)
+{
+        return towupper(c);
+}
+
+wint_t __towlower_l(wint_t c, locale_t l)
+{
+        return towlower(c);
+}
+
+weak_alias(__towupper_l, towupper_l);
+weak_alias(__towlower_l, towlower_l);