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

fusl/src/locale/dcngettext.c

Index: fusl/src/locale/dcngettext.c
diff --git a/fusl/src/locale/dcngettext.c b/fusl/src/locale/dcngettext.c
new file mode 100644
index 0000000000000000000000000000000000000000..a5ff847504f58a5904dc2a949e73a354661f3a08
--- /dev/null
+++ b/fusl/src/locale/dcngettext.c
@@ -0,0 +1,249 @@
+#include <libintl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <limits.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include "locale_impl.h"
+#include "libc.h"
+#include "atomic.h"
+
+struct binding {
+	struct binding *next;
+	int dirlen;
+	volatile int active;
+	char *domainname;
+	char *dirname;
+	char buf[];
+};
+
+static void *volatile bindings;
+
+static char *gettextdir(const char *domainname, size_t *dirlen)
+{
+	struct binding *p;
+	for (p=bindings; p; p=p->next) {
+		if (!strcmp(p->domainname, domainname) && p->active) {
+			*dirlen = p->dirlen;
+			return (char *)p->dirname;
+		}
+	}
+	return 0;
+}
+
+char *bindtextdomain(const char *domainname, const char *dirname)
+{
+	static volatile int lock[2];
+	struct binding *p, *q;
+
+	if (!domainname) return 0;
+	if (!dirname) return gettextdir(domainname, &(size_t){0});
+
+	size_t domlen = strlen(domainname);
+	size_t dirlen = strlen(dirname);
+	if (domlen > NAME_MAX || dirlen >= PATH_MAX) {
+		errno = EINVAL;
+		return 0;
+	}
+
+	LOCK(lock);
+
+	for (p=bindings; p; p=p->next) {
+		if (!strcmp(p->domainname, domainname) &&
+		    !strcmp(p->dirname, dirname)) {
+			break;
+		}
+	}
+
+	if (!p) {
+		p = malloc(sizeof *p + domlen + dirlen + 2);
+		if (!p) {
+			UNLOCK(lock);
+			return 0;
+		}
+		p->next = bindings;
+		p->dirlen = dirlen;
+		p->domainname = p->buf;
+		p->dirname = p->buf + domlen + 1;
+		memcpy(p->domainname, domainname, domlen+1);
+		memcpy(p->dirname, dirname, dirlen+1);
+		a_cas_p(&bindings, bindings, p);
+	}
+
+	a_store(&p->active, 1);
+
+	for (q=bindings; q; q=q->next) {
+		if (!strcmp(p->domainname, domainname) && q != p)
+			a_store(&q->active, 0);
+	}
+
+	UNLOCK(lock);
+	
+	return (char *)p->dirname;
+}
+
+static const char catnames[][12] = {
+	"LC_CTYPE",
+	"LC_NUMERIC",
+	"LC_TIME",
+	"LC_COLLATE",
+	"LC_MONETARY",
+	"LC_MESSAGES",
+};
+
+static const char catlens[] = { 8, 10, 7, 10, 11, 11 };
+
+struct msgcat {
+	struct msgcat *next;
+	const void *map;
+	size_t map_size;
+	void *volatile plural_rule;
+	volatile int nplurals;
+	char name[];
+};
+
+static char *dummy_gettextdomain()
+{
+	return "messages";
+}
+
+weak_alias(dummy_gettextdomain, __gettextdomain);
+
+const unsigned char *__map_file(const char *, size_t *);
+int __munmap(void *, size_t);
+unsigned long __pleval(const char *, unsigned long);
+
+char *dcngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n, int category)
+{
+	static struct msgcat *volatile cats;
+	struct msgcat *p;
+	struct __locale_struct *loc = CURRENT_LOCALE;
+	const struct __locale_map *lm;
+	const char *dirname, *locname, *catname;
+	size_t dirlen, loclen, catlen, domlen;
+
+	if ((unsigned)category >= LC_ALL) goto notrans;
+
+	if (!domainname) domainname = __gettextdomain();
+
+	domlen = strlen(domainname);
+	if (domlen > NAME_MAX) goto notrans;
+
+	dirname = gettextdir(domainname, &dirlen);
+	if (!dirname) goto notrans;
+
+	lm = loc->cat[category];
+	if (!lm) {
+notrans:
+		return (char *) ((n == 1) ? msgid1 : msgid2);
+	}
+	locname = lm->name;
+
+	catname = catnames[category];
+	catlen = catlens[category];
+	loclen = strlen(locname);
+
+	size_t namelen = dirlen+1 + loclen+1 + catlen+1 + domlen+3;
+	char name[namelen+1], *s = name;
+
+	memcpy(s, dirname, dirlen);
+	s[dirlen] = '/';
+	s += dirlen + 1;
+	memcpy(s, locname, loclen);
+	s[loclen] = '/';
+	s += loclen + 1;
+	memcpy(s, catname, catlen);
+	s[catlen] = '/';
+	s += catlen + 1;
+	memcpy(s, domainname, domlen);
+	s[domlen] = '.';
+	s[domlen+1] = 'm';
+	s[domlen+2] = 'o';
+	s[domlen+3] = 0;
+
+	for (p=cats; p; p=p->next)
+		if (!strcmp(p->name, name))
+			break;
+
+	if (!p) {
+		void *old_cats;
+		size_t map_size;
+		const void *map = __map_file(name, &map_size);
+		if (!map) goto notrans;
+		p = malloc(sizeof *p + namelen + 1);
+		if (!p) {
+			__munmap((void *)map, map_size);
+			goto notrans;
+		}
+		p->map = map;
+		p->map_size = map_size;
+		memcpy(p->name, name, namelen+1);
+		do {
+			old_cats = cats;
+			p->next = old_cats;
+		} while (a_cas_p(&cats, old_cats, p) != old_cats);
+	}
+
+	const char *trans = __mo_lookup(p->map, p->map_size, msgid1);
+	if (!trans) goto notrans;
+
+	/* Non-plural-processing gettext forms pass a null pointer as
+	 * msgid2 to request that dcngettext suppress plural processing. */
+	if (!msgid2) return (char *)trans;
+
+	if (!p->plural_rule) {
+		const char *rule = "n!=1;";
+		unsigned long np = 2;
+		const char *r = __mo_lookup(p->map, p->map_size, "");
+		char *z;
+		while (r && strncmp(r, "Plural-Forms:", 13)) {
+			z = strchr(r, '\n');
+			r = z ? z+1 : 0;
+		}
+		if (r) {
+			r += 13;
+			while (isspace(*r)) r++;
+			if (!strncmp(r, "nplurals=", 9)) {
+				np = strtoul(r+9, &z, 10);
+				r = z;
+			}
+			while (*r && *r != ';') r++;
+			if (*r) {
+				r++;
+				while (isspace(*r)) r++;
+				if (!strncmp(r, "plural=", 7))
+					rule = r+7;
+			}
+		}
+		a_store(&p->nplurals, np);
+		a_cas_p(&p->plural_rule, 0, (void *)rule);
+	}
+	if (p->nplurals) {
+		unsigned long plural = __pleval(p->plural_rule, n);
+		if (plural > p->nplurals) goto notrans;
+		while (plural--) {
+			size_t rem = p->map_size - (trans - (char *)p->map);
+			size_t l = strnlen(trans, rem);
+			if (l+1 >= rem)
+				goto notrans;
+			trans += l+1;
+		}
+	}
+	return (char *)trans;
+}
+
+char *dcgettext(const char *domainname, const char *msgid, int category)
+{
+	return dcngettext(domainname, msgid, 0, 1, category);
+}
+
+char *dngettext(const char *domainname, const char *msgid1, const char *msgid2, unsigned long int n)
+{
+	return dcngettext(domainname, msgid1, msgid2, n, LC_MESSAGES);
+}
+
+char *dgettext(const char *domainname, const char *msgid)
+{
+	return dcngettext(domainname, msgid, 0, 1, LC_MESSAGES);
+}