add support for LC_TIME and LC_MESSAGES translations

for LC_MESSAGES, translation of strerror and similar literal message
functions is supported. for messages in other places (particularly the
dynamic linker) that use format strings, translation is not yet
supported. in order to make it possible and safe, such messages will
need to be refactored to separate the textual content from the format.

for LC_TIME, the day and month names and strftime-style format strings
provided by nl_langinfo are supported for translation. however there
may be limitations, as some of the original C-locale nl_langinfo
strings are non-unique and thus perhaps non-suitable as keys.

overall, the locale support activated by this commit should not be
seen as complete and polished but as a basis for beginning to test
locale functionality and implement locales.

src/errno/strerror.c

@@ -1,5 +1,7 @@
 #include <errno.h>
 #include <string.h>
+#include "locale_impl.h"
+#include "libc.h"
 
 #define E(a,b) ((unsigned char)a),
 static const unsigned char errid[] = {
@@ -12,7 +14,7 @@ static const char errmsg[] =
 #include "__strerror.h"
 ;
 
-char *strerror(int e)
+char *__strerror_l(int e, locale_t loc)
 {
 	const char *s;
 	int i;
@@ -24,5 +26,12 @@ char *strerror(int e)
 	}
 	for (i=0; errid[i] && errid[i] != e; i++);
 	for (s=errmsg; i; s++, i--) for (; *s; s++);
-	return (char *)s;
+	return (char *)LCTRANS(s, LC_MESSAGES, loc);
 }
+
+char *strerror(int e)
+{
+	return __strerror_l(e, CURRENT_LOCALE);
+}
+
+weak_alias(__strerror_l, strerror_l);

src/locale/langinfo.c

@@ -57,6 +57,7 @@ char *__nl_langinfo_l(nl_item item, locale_t loc)
 	}
 
 	for (; idx; idx--, str++) for (; *str; str++);
+	if (cat != LC_NUMERIC && *str) str = LCTRANS(str, cat, loc);
 	return (char *)str;
 }
 

src/locale/strerror_l.c

@@ -1,7 +0,0 @@
-#include <string.h>
-#include <locale.h>
-
-char *strerror_l(int err, locale_t l)
-{
-	return strerror(err);
-}

src/network/gai_strerror.c

@@ -1,4 +1,5 @@
 #include <netdb.h>
+#include "locale_impl.h"
 
 static const char msgs[] =
 	"Invalid flags\0"
@@ -19,5 +20,6 @@ const char *gai_strerror(int ecode)
 {
 	const char *s;
 	for (s=msgs, ecode++; ecode && *s; ecode++, s++) for (; *s; s++);
-	return *s ? s : s+1;
+	if (!*s) s++;
+	return LCTRANS_CUR(s);
 }

src/network/hstrerror.c

@@ -1,5 +1,6 @@
 #define _GNU_SOURCE
 #include <netdb.h>
+#include "locale_impl.h"
 
 static const char msgs[] =
 	"Host not found\0"
@@ -12,5 +13,6 @@ const char *hstrerror(int ecode)
 {
 	const char *s;
 	for (s=msgs, ecode--; ecode && *s; ecode--, s++) for (; *s; s++);
-	return *s ? s : s+1;
+	if (!*s) s++;
+	return LCTRANS_CUR(s);
 }

src/regex/regerror.c

@@ -1,6 +1,7 @@
 #include <string.h>
 #include <regex.h>
 #include <stdio.h>
+#include "locale_impl.h"
 
 /* Error message strings for error codes listed in `regex.h'.  This list
    needs to be in sync with the codes listed there, naturally. */
@@ -31,5 +32,6 @@ size_t regerror(int e, const regex_t *restrict preg, char *restrict buf, size_t
 	const char *s;
 	for (s=messages; e && *s; e--, s+=strlen(s)+1);
 	if (!*s) s++;
+	s = LCTRANS_CUR(s);
 	return 1+snprintf(buf, size, "%s", s);
 }

src/string/strsignal.c

@@ -1,5 +1,6 @@
 #include <signal.h>
 #include <string.h>
+#include "locale_impl.h"
 
 #if (SIGHUP == 1) && (SIGINT == 2) && (SIGQUIT == 3) && (SIGILL == 4) \
  && (SIGTRAP == 5) && (SIGABRT == 6) && (SIGBUS == 7) && (SIGFPE == 8) \
@@ -104,12 +105,12 @@ static const char strings[] =
 
 char *strsignal(int signum)
 {
-	char *s = (char *)strings;
+	const char *s = strings;
 
 	signum = sigmap(signum);
 	if (signum - 1U >= _NSIG-1) signum = 0;
 
 	for (; signum--; s++) for (; *s; s++);
 
-	return s;
+	return (char *)LCTRANS_CUR(s);
 }