implement locale file loading and state for remaining locale categories

there is still no code which actually uses the loaded locale files, so
the main observable effect of this commit is that calls to setlocale
store and give back the names of the selected locales for the
remaining categories (LC_TIME, LC_COLLATE, LC_MONETARY) if a locale
file by the requested name could be loaded.

1 files changed, 58 insertions, 0 deletions

diff --git a/src/locale/__setlocalecat.c b/src/locale/__setlocalecat.c
index a947dbff..bbecde41 100644
--- a/src/locale/__setlocalecat.c
+++ b/src/locale/__setlocalecat.c
@@ -4,6 +4,58 @@
 #include "libc.h"
 #include "atomic.h"
 
+const unsigned char *__map_file(const char *, size_t *);
+int __munmap(void *, size_t);
+char *__strchrnul(const char *, int);
+
+static struct __locale_map *findlocale(const char *name, size_t n)
+{
+	static void *loc_head;
+	struct __locale_map *p, *new, *old_head;
+	const char *path = 0, *z;
+	char buf[256];
+	size_t l;
+	const void *map;
+	size_t map_size;
+
+	for (p=loc_head; p; p=p->next)
+		if (!strcmp(name, p->name)) return p;
+
+	if (strchr(name, '/')) return 0;
+
+	if (!libc.secure) path = getenv("MUSL_LOCPATH");
+	/* FIXME: add a default path? */
+	if (!path) return 0;
+
+	for (; *path; path=z+!!*z) {
+		z = __strchrnul(path, ':');
+		l = z - path - !!*z;
+		if (l >= sizeof buf - n - 2) continue;
+		memcpy(buf, path, l);
+		buf[l] = '/';
+		memcpy(buf+l+1, name, n);
+		buf[l+1+n] = 0;
+		map = __map_file(buf, &map_size);
+		if (map) {
+			new = malloc(sizeof *new);
+			if (!new) {
+				__munmap((void *)map, map_size);
+				return 0;
+			}
+			new->map = map;
+			new->map_size = map_size;
+			memcpy(new->name, name, n);
+			new->name[n] = 0;
+			do {
+				old_head = loc_head;
+				new->next = old_head;
+			} while (a_cas_p(&loc_head, old_head, new) != old_head);
+			return new;
+		}
+	}
+	return 0;
+}
+
 static const char envvars[][12] = {
 	"LC_CTYPE",
 	"LC_NUMERIC",
@@ -26,6 +78,7 @@ int __setlocalecat(locale_t loc, int cat, const char *val)
 	int builtin = (val[0]=='C' && !val[1])
 		|| !strcmp(val, "C.UTF-8")
 		|| !strcmp(val, "POSIX");
+	struct __locale_map *data, *old;
 
 	switch (cat) {
 	case LC_CTYPE:
@@ -40,6 +93,11 @@ int __setlocalecat(locale_t loc, int cat, const char *val)
 		}
 		/* fall through */
 	default:
+		data = builtin ? 0 : findlocale(val, n);
+		if (data == loc->cat[cat-2]) break;
+		do old = loc->cat[cat-2];
+		while (a_cas_p(&loc->cat[cat-2], old, data) != old);
+	case LC_NUMERIC:
 		break;
 	}
 	return 0;