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

fusl/src/stdio/vfwscanf.c

Index: fusl/src/stdio/vfwscanf.c
diff --git a/fusl/src/stdio/vfwscanf.c b/fusl/src/stdio/vfwscanf.c
new file mode 100644
index 0000000000000000000000000000000000000000..223aad4f351c96bb2a2ca9f9e3e75b798546ac75
--- /dev/null
+++ b/fusl/src/stdio/vfwscanf.c
@@ -0,0 +1,328 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <wchar.h>
+#include <wctype.h>
+#include <limits.h>
+#include <string.h>
+
+#include "stdio_impl.h"
+#include "shgetc.h"
+#include "intscan.h"
+#include "floatscan.h"
+#include "libc.h"
+
+#define SIZE_hh -2
+#define SIZE_h  -1
+#define SIZE_def 0
+#define SIZE_l   1
+#define SIZE_L   2
+#define SIZE_ll  3
+
+static void store_int(void *dest, int size, unsigned long long i)
+{
+	if (!dest) return;
+	switch (size) {
+	case SIZE_hh:
+		*(char *)dest = i;
+		break;
+	case SIZE_h:
+		*(short *)dest = i;
+		break;
+	case SIZE_def:
+		*(int *)dest = i;
+		break;
+	case SIZE_l:
+		*(long *)dest = i;
+		break;
+	case SIZE_ll:
+		*(long long *)dest = i;
+		break;
+	}
+}
+
+static void *arg_n(va_list ap, unsigned int n)
+{
+	void *p;
+	unsigned int i;
+	va_list ap2;
+	va_copy(ap2, ap);
+	for (i=n; i>1; i--) va_arg(ap2, void *);
+	p = va_arg(ap2, void *);
+	va_end(ap2);
+	return p;
+}
+
+static int in_set(const wchar_t *set, int c)
+{
+	int j;
+	const wchar_t *p = set;
+	if (*p == '-') {
+		if (c=='-') return 1;
+		p++;
+	} else if (*p == ']') {
+		if (c==']') return 1;
+		p++;
+	}
+	for (; *p && *p != ']'; p++) {
+		if (*p=='-' && p[1] && p[1] != ']')
+			for (j=p++[-1]; j<*p; j++)
+				if (c==j) return 1;
+		if (c==*p) return 1;
+	}
+	return 0;
+}
+
+#if 1
+#undef getwc
+#define getwc(f) \
+	((f)->rpos < (f)->rend && *(f)->rpos < 128 ? *(f)->rpos++ : (getwc)(f))
+
+#undef ungetwc
+#define ungetwc(c,f) \
+	((f)->rend && (c)<128U ? *--(f)->rpos : ungetwc((c),(f)))
+#endif
+
+int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
+{
+	int width;
+	int size;
+	int alloc;
+	const wchar_t *p;
+	int c, t;
+	char *s;
+	wchar_t *wcs;
+	void *dest=NULL;
+	int invert;
+	int matches=0;
+	off_t pos = 0, cnt;
+	static const char size_pfx[][3] = { "hh", "h", "", "l", "L", "ll" };
+	char tmp[3*sizeof(int)+10];
+	const wchar_t *set;
+	size_t i, k;
+
+	FLOCK(f);
+
+	fwide(f, 1);
+
+	for (p=fmt; *p; p++) {
+
+		alloc = 0;
+
+		if (iswspace(*p)) {
+			while (iswspace(p[1])) p++;
+			while (iswspace((c=getwc(f)))) pos++;
+			ungetwc(c, f);
+			continue;
+		}
+		if (*p != '%' || p[1] == '%') {
+			p += *p=='%';
+			c = getwc(f);
+			if (c!=*p) {
+				ungetwc(c, f);
+				if (c<0) goto input_fail;
+				goto match_fail;
+			}
+			pos++;
+			continue;
+		}
+
+		p++;
+		if (*p=='*') {
+			dest = 0; p++;
+		} else if (iswdigit(*p) && p[1]=='$') {
+			dest = arg_n(ap, *p-'0'); p+=2;
+		} else {
+			dest = va_arg(ap, void *);
+		}
+
+		for (width=0; iswdigit(*p); p++) {
+			width = 10*width + *p - '0';
+		}
+
+		if (*p=='m') {
+			wcs = 0;
+			s = 0;
+			alloc = !!dest;
+			p++;
+		} else {
+			alloc = 0;
+		}
+
+		size = SIZE_def;
+		switch (*p++) {
+		case 'h':
+			if (*p == 'h') p++, size = SIZE_hh;
+			else size = SIZE_h;
+			break;
+		case 'l':
+			if (*p == 'l') p++, size = SIZE_ll;
+			else size = SIZE_l;
+			break;
+		case 'j':
+			size = SIZE_ll;
+			break;
+		case 'z':
+		case 't':
+			size = SIZE_l;
+			break;
+		case 'L':
+			size = SIZE_L;
+			break;
+		case 'd': case 'i': case 'o': case 'u': case 'x':
+		case 'a': case 'e': case 'f': case 'g':
+		case 'A': case 'E': case 'F': case 'G': case 'X':
+		case 's': case 'c': case '[':
+		case 'S': case 'C':
+		case 'p': case 'n':
+			p--;
+			break;
+		default:
+			goto fmt_fail;
+		}
+
+		t = *p;
+
+		/* Transform S,C -> ls,lc */
+		if ((t&0x2f)==3) {
+			size = SIZE_l;
+			t |= 32;
+		}
+
+		if (t != 'n') {
+			if (t != '[' && (t|32) != 'c')
+				while (iswspace((c=getwc(f)))) pos++;
+			else
+				c=getwc(f);
+			if (c < 0) goto input_fail;
+			ungetwc(c, f);
+		}
+
+		switch (t) {
+		case 'n':
+			store_int(dest, size, pos);
+			/* do not increment match count, etc! */
+			continue;
+
+		case 's':
+		case 'c':
+		case '[':
+			if (t == 'c') {
+				if (width<1) width = 1;
+				invert = 1;
+				set = L"";
+			} else if (t == 's') {
+				invert = 1;
+				set = (const wchar_t[]){
+					' ', '\t', '\n', '\r', 11, 12,  0x0085,
+					0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005,
+					0x2006, 0x2008, 0x2009, 0x200a,
+					0x2028, 0x2029, 0x205f, 0x3000, 0 };
+			} else {
+				if (*++p == '^') p++, invert = 1;
+				else invert = 0;
+				set = p;
+				if (*p==']') p++;
+				while (*p!=']') {
+					if (!*p) goto fmt_fail;
+					p++;
+				}
+			}
+
+			s = (size == SIZE_def) ? dest : 0;
+			wcs = (size == SIZE_l) ? dest : 0;
+
+			int gotmatch = 0;
+
+			if (width < 1) width = -1;
+
+			i = 0;
+			if (alloc) {
+				k = t=='c' ? width+1U : 31;
+				if (size == SIZE_l) {
+					wcs = malloc(k*sizeof(wchar_t));
+					if (!wcs) goto alloc_fail;
+				} else {
+					s = malloc(k);
+					if (!s) goto alloc_fail;
+				}
+			}
+			while (width) {
+				if ((c=getwc(f))<0) break;
+				if (in_set(set, c) == invert)
+					break;
+				if (wcs) {
+					wcs[i++] = c;
+					if (alloc && i==k) {
+						k += k+1;
+						wchar_t *tmp = realloc(wcs, k*sizeof(wchar_t));
+						if (!tmp) goto alloc_fail;
+						wcs = tmp;
+					}
+				} else if (size != SIZE_l) {
+					int l = wctomb(s?s+i:tmp, c);
+					if (l<0) goto input_fail;
+					i += l;
+					if (alloc && i > k-4) {
+						k += k+1;
+						char *tmp = realloc(s, k);
+						if (!tmp) goto alloc_fail;
+						s = tmp;
+					}
+				}
+				pos++;
+				width-=(width>0);
+				gotmatch=1;
+			}
+			if (width) {
+				ungetwc(c, f);
+				if (t == 'c' || !gotmatch) goto match_fail;
+			}
+
+			if (alloc) {
+				if (size == SIZE_l) *(wchar_t **)dest = wcs;
+				else *(char **)dest = s;
+			}
+			if (t != 'c') {
+				if (wcs) wcs[i] = 0;
+				if (s) s[i] = 0;
+			}
+			break;
+
+		case 'd': case 'i': case 'o': case 'u': case 'x':
+		case 'a': case 'e': case 'f': case 'g':
+		case 'A': case 'E': case 'F': case 'G': case 'X':
+		case 'p':
+			if (width < 1) width = 0;
+			snprintf(tmp, sizeof tmp, "%.*s%.0d%s%c%%lln",
+				1+!dest, "%*", width, size_pfx[size+2], t);
+			cnt = 0;
+			if (fscanf(f, tmp, dest?dest:&cnt, &cnt) == -1)
+				goto input_fail;
+			else if (!cnt)
+				goto match_fail;
+			pos += cnt;
+			break;
+		default:
+			goto fmt_fail;
+		}
+
+		if (dest) matches++;
+	}
+	if (0) {
+fmt_fail:
+alloc_fail:
+input_fail:
+		if (!matches) matches--;
+match_fail:
+		if (alloc) {
+			free(s);
+			free(wcs);
+		}
+	}
+	FUNLOCK(f);
+	return matches;
+}
+
+weak_alias(vfwscanf,__isoc99_vfwscanf);