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

fusl/src/locale/iconv.c

Index: fusl/src/locale/iconv.c
diff --git a/fusl/src/locale/iconv.c b/fusl/src/locale/iconv.c
new file mode 100644
index 0000000000000000000000000000000000000000..1eeea94e0a38753691269b978f105b5e65ee33b8
--- /dev/null
+++ b/fusl/src/locale/iconv.c
@@ -0,0 +1,455 @@
+#include <iconv.h>
+#include <errno.h>
+#include <wchar.h>
+#include <string.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <stdint.h>
+#include "locale_impl.h"
+
+#define UTF_32BE    0300
+#define UTF_16LE    0301
+#define UTF_16BE    0302
+#define UTF_32LE    0303
+#define UCS2BE      0304
+#define UCS2LE      0305
+#define WCHAR_T     0306
+#define US_ASCII    0307
+#define UTF_8       0310
+#define EUC_JP      0320
+#define SHIFT_JIS   0321
+#define GB18030     0330
+#define GBK         0331
+#define GB2312      0332
+#define BIG5        0340
+#define EUC_KR      0350
+
+/* Definitions of charmaps. Each charmap consists of:
+ * 1. Empty-string-terminated list of null-terminated aliases.
+ * 2. Special type code or number of elided entries.
+ * 3. Character table (size determined by field 2). */
+
+static const unsigned char charmaps[] =
+"utf8\0char\0\0\310"
+"wchart\0\0\306"
+"ucs2\0ucs2be\0\0\304"
+"ucs2le\0\0\305"
+"utf16\0utf16be\0\0\302"
+"utf16le\0\0\301"
+"ucs4\0ucs4be\0utf32\0utf32be\0\0\300"
+"ucs4le\0utf32le\0\0\303"
+"ascii\0usascii\0iso646\0iso646us\0\0\307"
+"eucjp\0\0\320"
+"shiftjis\0sjis\0\0\321"
+"gb18030\0\0\330"
+"gbk\0\0\331"
+"gb2312\0\0\332"
+"big5\0bigfive\0cp950\0big5hkscs\0\0\340"
+"euckr\0ksc5601\0ksx1001\0cp949\0\0\350"
+#include "codepages.h"
+;
+
+static const unsigned short legacy_chars[] = {
+#include "legacychars.h"
+};
+
+static const unsigned short jis0208[84][94] = {
+#include "jis0208.h"
+};
+
+static const unsigned short gb18030[126][190] = {
+#include "gb18030.h"
+};
+
+static const unsigned short big5[89][157] = {
+#include "big5.h"
+};
+
+static const unsigned short hkscs[] = {
+#include "hkscs.h"
+};
+
+static const unsigned short ksc[93][94] = {
+#include "ksc.h"
+};
+
+static int fuzzycmp(const unsigned char *a, const unsigned char *b)
+{
+	for (; *a && *b; a++, b++) {
+		while (*a && (*a|32U)-'a'>26 && *a-'0'>10U) a++;
+		if ((*a|32U) != *b) return 1;
+	}
+	return *a != *b;
+}
+
+static size_t find_charmap(const void *name)
+{
+	const unsigned char *s;
+	if (!*(char *)name) name=charmaps; /* "utf8" */
+	for (s=charmaps; *s; ) {
+		if (!fuzzycmp(name, s)) {
+			for (; *s; s+=strlen((void *)s)+1);
+			return s+1-charmaps;
+		}
+		s += strlen((void *)s)+1;
+		if (!*s) {
+			if (s[1] > 0200) s+=2;
+			else s+=2+(128U-s[1])/4*5;
+		}
+	}
+	return -1;
+}
+
+iconv_t iconv_open(const char *to, const char *from)
+{
+	size_t f, t;
+
+	if ((t = find_charmap(to))==-1
+	 || (f = find_charmap(from))==-1
+	 || (charmaps[t] >= 0320)) {
+		errno = EINVAL;
+		return (iconv_t)-1;
+	}
+
+	return (void *)(f<<16 | t);
+}
+
+int iconv_close(iconv_t cd)
+{
+	return 0;
+}
+
+static unsigned get_16(const unsigned char *s, int e)
+{
+	e &= 1;
+	return s[e]<<8 | s[1-e];
+}
+
+static void put_16(unsigned char *s, unsigned c, int e)
+{
+	e &= 1;
+	s[e] = c>>8;
+	s[1-e] = c;
+}
+
+static unsigned get_32(const unsigned char *s, int e)
+{
+	e &= 3;
+	return s[e]+0U<<24 | s[e^1]<<16 | s[e^2]<<8 | s[e^3];
+}
+
+static void put_32(unsigned char *s, unsigned c, int e)
+{
+	e &= 3;
+	s[e^0] = c>>24;
+	s[e^1] = c>>16;
+	s[e^2] = c>>8;
+	s[e^3] = c;
+}
+
+/* Adapt as needed */
+#define mbrtowc_utf8 mbrtowc
+#define wctomb_utf8 wctomb
+
+size_t iconv(iconv_t cd0, char **restrict in, size_t *restrict inb, char **restrict out, size_t *restrict outb)
+{
+	size_t x=0;
+	unsigned long cd = (unsigned long)cd0;
+	unsigned to = cd & 0xffff;
+	unsigned from = cd >> 16;
+	const unsigned char *map = charmaps+from+1;
+	const unsigned char *tomap = charmaps+to+1;
+	mbstate_t st = {0};
+	wchar_t wc;
+	unsigned c, d;
+	size_t k, l;
+	int err;
+	unsigned char type = map[-1];
+	unsigned char totype = tomap[-1];
+	locale_t *ploc = &CURRENT_LOCALE, loc = *ploc;
+
+	if (!in || !*in || !*inb) return 0;
+
+	*ploc = UTF8_LOCALE;
+
+	for (; *inb; *in+=l, *inb-=l) {
+		c = *(unsigned char *)*in;
+		l = 1;
+
+		if (c >= 128 || type-UTF_32BE < 7U) switch (type) {
+		case UTF_8:
+			l = mbrtowc_utf8(&wc, *in, *inb, &st);
+			if (!l) l++;
+			else if (l == (size_t)-1) goto ilseq;
+			else if (l == (size_t)-2) goto starved;
+			c = wc;
+			break;
+		case US_ASCII:
+			goto ilseq;
+		case WCHAR_T:
+			l = sizeof(wchar_t);
+			if (*inb < l) goto starved;
+			c = *(wchar_t *)*in;
+			if (0) {
+		case UTF_32BE:
+		case UTF_32LE:
+			l = 4;
+			if (*inb < 4) goto starved;
+			c = get_32((void *)*in, type);
+			}
+			if (c-0xd800u < 0x800u || c >= 0x110000u) goto ilseq;
+			break;
+		case UCS2BE:
+		case UCS2LE:
+		case UTF_16BE:
+		case UTF_16LE:
+			l = 2;
+			if (*inb < 2) goto starved;
+			c = get_16((void *)*in, type);
+			if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
+			if ((unsigned)(c-0xd800) < 0x400) {
+				if (type-UCS2BE < 2U) goto ilseq;
+				l = 4;
+				if (*inb < 4) goto starved;
+				d = get_16((void *)(*in + 2), type);
+				if ((unsigned)(d-0xdc00) >= 0x400) goto ilseq;
+				c = ((c-0xd7c0)<<10) + (d-0xdc00);
+			}
+			break;
+		case SHIFT_JIS:
+			if (c-0xa1 <= 0xdf-0xa1) {
+				c += 0xff61-0xa1;
+				break;
+			}
+			l = 2;
+			if (*inb < 2) goto starved;
+			d = *((unsigned char *)*in + 1);
+			if (c-129 <= 159-129) c -= 129;
+			else if (c-224 <= 239-224) c -= 193;
+			else goto ilseq;
+			c *= 2;
+			if (d-64 <= 158-64) {
+				if (d==127) goto ilseq;
+				if (d>127) d--;
+				d -= 64;
+			} else if (d-159 <= 252-159) {
+				c++;
+				d -= 159;
+			}
+			c = jis0208[c][d];
+			if (!c) goto ilseq;
+			break;
+		case EUC_JP:
+			l = 2;
+			if (*inb < 2) goto starved;
+			d = *((unsigned char *)*in + 1);
+			if (c==0x8e) {
+				c = d;
+				if (c-0xa1 > 0xdf-0xa1) goto ilseq;
+				c += 0xff61 - 0xa1;
+				break;
+			}
+			c -= 0xa1;
+			d -= 0xa1;
+			if (c >= 84 || d >= 94) goto ilseq;
+			c = jis0208[c][d];
+			if (!c) goto ilseq;
+			break;
+		case GB2312:
+			if (c < 0xa1) goto ilseq;
+		case GBK:
+		case GB18030:
+			c -= 0x81;
+			if (c >= 126) goto ilseq;
+			l = 2;
+			if (*inb < 2) goto starved;
+			d = *((unsigned char *)*in + 1);
+			if (d < 0xa1 && type == GB2312) goto ilseq;
+			if (d-0x40>=191 || d==127) {
+				if (d-'0'>9 || type != GB18030)
+					goto ilseq;
+				l = 4;
+				if (*inb < 4) goto starved;
+				c = (10*c + d-'0') * 1260;
+				d = *((unsigned char *)*in + 2);
+				if (d-0x81>126) goto ilseq;
+				c += 10*(d-0x81);
+				d = *((unsigned char *)*in + 3);
+				if (d-'0'>9) goto ilseq;
+				c += d-'0';
+				c += 128;
+				for (d=0; d<=c; ) {
+					k = 0;
+					for (int i=0; i<126; i++)
+						for (int j=0; j<190; j++)
+							if (gb18030[i][j]-d <= c-d)
+								k++;
+					d = c+1;
+					c += k;
+				}
+				break;
+			}
+			d -= 0x40;
+			if (d>63) d--;
+			c = gb18030[c][d];
+			break;
+		case BIG5:
+			l = 2;
+			if (*inb < 2) goto starved;
+			d = *((unsigned char *)*in + 1);
+			if (d-0x40>=0xff-0x40 || d-0x7f<0xa1-0x7f) goto ilseq;
+			d -= 0x40;
+			if (d > 0x3e) d -= 0x22;
+			if (c-0xa1>=0xfa-0xa1) {
+				if (c-0x87>=0xff-0x87) goto ilseq;
+				if (c < 0xa1) c -= 0x87;
+				else c -= 0x87 + (0xfa-0xa1);
+				c = (hkscs[4867+(c*157+d)/16]>>(c*157+d)%16)%2<<17
+					| hkscs[c*157+d];
+				/* A few HKSCS characters map to pairs of UCS
+				 * characters. These are mapped to surrogate
+				 * range in the hkscs table then hard-coded
+				 * here. Ugly, yes. */
+				if (c/256 == 0xdc) {
+					if (totype-0300U > 8) k = 2;
+					else k = "\10\4\4\10\4\4\10\2\4"[totype-0300];
+					if (k > *outb) goto toobig;
+					x += iconv((iconv_t)(uintptr_t)to,
+						&(char *){"\303\212\314\204"
+						"\303\212\314\214"
+						"\303\252\314\204"
+						"\303\252\314\214"
+						+c%256}, &(size_t){4},
+						out, outb);
+					continue;
+				}
+				if (!c) goto ilseq;
+				break;
+			}
+			c -= 0xa1;
+			c = big5[c][d]|(c==0x27&&(d==0x3a||d==0x3c||d==0x42))<<17;
+			if (!c) goto ilseq;
+			break;
+		case EUC_KR:
+			l = 2;
+			if (*inb < 2) goto starved;
+			d = *((unsigned char *)*in + 1);
+			c -= 0xa1;
+			d -= 0xa1;
+			if (c >= 93 || d >= 94) {
+				c += (0xa1-0x81);
+				d += 0xa1;
+				if (c >= 93 || c>=0xc6-0x81 && d>0x52)
+					goto ilseq;
+				if (d-'A'<26) d = d-'A';
+				else if (d-'a'<26) d = d-'a'+26;
+				else if (d-0x81<0xff-0x81) d = d-0x81+52;
+				else goto ilseq;
+				if (c < 0x20) c = 178*c + d;
+				else c = 178*0x20 + 84*(c-0x20) + d;
+				c += 0xac00;
+				for (d=0xac00; d<=c; ) {
+					k = 0;
+					for (int i=0; i<93; i++)
+						for (int j=0; j<94; j++)
+							if (ksc[i][j]-d <= c-d)
+								k++;
+					d = c+1;
+					c += k;
+				}
+				break;
+			}
+			c = ksc[c][d];
+			if (!c) goto ilseq;
+			break;
+		default:
+			if (c < 128+type) break;
+			c -= 128+type;
+			c = legacy_chars[ map[c*5/4]>>2*c%8 |
+				map[c*5/4+1]<<8-2*c%8 & 1023 ];
+			if (!c) c = *(unsigned char *)*in;
+			if (c==1) goto ilseq;
+		}
+
+		switch (totype) {
+		case WCHAR_T:
+			if (*outb < sizeof(wchar_t)) goto toobig;
+			*(wchar_t *)*out = c;
+			*out += sizeof(wchar_t);
+			*outb -= sizeof(wchar_t);
+			break;
+		case UTF_8:
+			if (*outb < 4) {
+				char tmp[4];
+				k = wctomb_utf8(tmp, c);
+				if (*outb < k) goto toobig;
+				memcpy(*out, tmp, k);
+			} else k = wctomb_utf8(*out, c);
+			*out += k;
+			*outb -= k;
+			break;
+		case US_ASCII:
+			if (c > 0x7f) subst: x++, c='*';
+		default:
+			if (*outb < 1) goto toobig;
+			if (c < 128+totype) {
+			revout:
+				*(*out)++ = c;
+				*outb -= 1;
+				break;
+			}
+			d = c;
+			for (c=0; c<128-totype; c++) {
+				if (d == legacy_chars[ tomap[c*5/4]>>2*c%8 |
+					tomap[c*5/4+1]<<8-2*c%8 & 1023 ]) {
+					c += 128;
+					goto revout;
+				}
+			}
+			goto subst;
+		case UCS2BE:
+		case UCS2LE:
+		case UTF_16BE:
+		case UTF_16LE:
+			if (c < 0x10000 || type-UCS2BE < 2U) {
+				if (c >= 0x10000) c = 0xFFFD;
+				if (*outb < 2) goto toobig;
+				put_16((void *)*out, c, totype);
+				*out += 2;
+				*outb -= 2;
+				break;
+			}
+			if (*outb < 4) goto toobig;
+			c -= 0x10000;
+			put_16((void *)*out, (c>>10)|0xd800, totype);
+			put_16((void *)(*out + 2), (c&0x3ff)|0xdc00, totype);
+			*out += 4;
+			*outb -= 4;
+			break;
+		case UTF_32BE:
+		case UTF_32LE:
+			if (*outb < 4) goto toobig;
+			put_32((void *)*out, c, totype);
+			*out += 4;
+			*outb -= 4;
+			break;
+		}
+	}
+	*ploc = loc;
+	return x;
+ilseq:
+	err = EILSEQ;
+	x = -1;
+	goto end;
+toobig:
+	err = E2BIG;
+	x = -1;
+	goto end;
+starved:
+	err = EINVAL;
+	x = -1;
+end:
+	errno = err;
+	*ploc = loc;
+	return x;
+}