fix tolower and locales

The function towlower doesn't work with locales different from C.
Issue was introduced in commit: 8cde3a9bf2856dcb9a759dec7ecb04a68e712254

Call to setlocale is needed for correct generation of the table uplow_diff.
Otherwise you receive compile time error "range assumption error" after
uncommenting the call.

Similar problem described here:
http://lists.uclibc.org/pipermail/uclibc/2015-March/048852.html

This commit fix the problem by using int32_t values.

extra/locale/gen_ldc.c

@@ -129,6 +129,20 @@ void out_i16(FILE *f, const int16_t *p, size_t n, char *comment)
 	fprintf(f, "\n},\n");
 }
 
+void out_i32(FILE *f, const int32_t *p, size_t n, char *comment)
+{
+	size_t i;
+
+	fprintf(f, "{\t/* %s */", comment);
+	for (i = 0 ; i < n ; i++) {
+		if (!(i & 7)) {
+			fprintf(f, "\n\t");
+		}
+		fprintf(f, "%11d, ", p[i]);
+	}
+	fprintf(f, "\n},\n");
+}
+
 void out_size_t(FILE *f, const size_t *p, size_t n, char *comment)
 {
 	size_t i;
@@ -194,7 +208,7 @@ int main(int argc, char **argv)
 #ifdef __WCHAR_ENABLED
 	out_uc(lso, __LOCALE_DATA_WCctype_data, __LOCALE_DATA_WCctype_TBL_LEN, "tblwctype");
 	out_uc(lso, __LOCALE_DATA_WCuplow_data, __LOCALE_DATA_WCuplow_TBL_LEN, "tblwuplow");
-	out_i16(lso, __LOCALE_DATA_WCuplow_diff_data, __LOCALE_DATA_WCuplow_diff_TBL_LEN, "tblwuplow_diff");
+	out_i32(lso, __LOCALE_DATA_WCuplow_diff_data, __LOCALE_DATA_WCuplow_diff_TBL_LEN, "tblwuplow_diff");
 /* 	const unsigned char tblwcomb[WCcomb_TBL_LEN]; */
 	/* width?? */
 #endif /* __WCHAR_ENABLED */

extra/locale/gen_wctype.c

@@ -83,8 +83,8 @@
 #define mywxdigit(D,C) (mywdigit(D,C) || (unsigned)(((C) | 0x20) - 'a') <= 5)
 
 typedef struct {
-	short l;
-	short u;
+	int32_t l;
+	int32_t u;
 } uldiff_entry;
 
 typedef struct {
@@ -227,12 +227,11 @@ int main(int argc, char **argv)
 			++verbose;
 			continue;
 		}
-	/* setlocale might be just a stub */
-	/*	if (!setlocale(LC_CTYPE, *argv)) {
+		/* setlocale might be just a stub */
+		if (!setlocale(LC_CTYPE, *argv)) {
 			verbose_msg("setlocale(LC_CTYPE,%s) failed!  Skipping this locale...\n", *argv);
 			continue;
 		}
-	*/
 		if (!(totitle = wctrans("totitle"))) {
 			verbose_msg("no totitle transformation.\n");
 		}
@@ -402,7 +401,7 @@ int main(int argc, char **argv)
 				u = (long)(int) towupper(c) - c;
 				ult[c] = 0;
 				if (l || u) {
-					if ((l != (short)l) || (u != (short)u)) {
+					if ((l != (int32_t)l) || (u != (int32_t)u)) {
 						verbose_msg("range assumption error!  %x  %ld  %ld\n", c, l, u);
 						return EXIT_FAILURE;
 					}
@@ -684,7 +683,7 @@ int main(int argc, char **argv)
 
 		printf("#define __LOCALE_DATA_WCuplow_diffs  %7u\n", ul_count);
 		printf("\n#ifdef WANT_WCuplow_diff_data\n\n");
-		printf("\nstatic const short __LOCALE_DATA_WCuplow_diff_data[%zu] = {",
+		printf("\nstatic const int32_t __LOCALE_DATA_WCuplow_diff_data[%zu] = {",
 			   2 * (size_t) ul_count);
 		for (i = 0; i < ul_count; i++) {
 			if (i % 4 == 0) {

extra/locale/locale_mmap.h

@@ -45,7 +45,7 @@ typedef struct {
 #ifdef __WCHAR_ENABLED
 	const unsigned char tblwctype[__LOCALE_DATA_WCctype_TBL_LEN];
 	const unsigned char tblwuplow[__LOCALE_DATA_WCuplow_TBL_LEN];
-	const int16_t tblwuplow_diff[__LOCALE_DATA_WCuplow_diff_TBL_LEN];
+	const int32_t tblwuplow_diff[__LOCALE_DATA_WCuplow_diff_TBL_LEN];
 /* 	const unsigned char tblwcomb[WCcomb_TBL_LEN]; */
 	/* width?? */
 #endif

libc/misc/locale/locale.c

@@ -820,7 +820,7 @@ void attribute_hidden _locale_init_l(__locale_t base)
 	base->tblwuplow
 		= (const unsigned char *) &__locale_mmap->tblwuplow;
 	base->tblwuplow_diff
-		= (const int16_t *) &__locale_mmap->tblwuplow_diff;
+		= (const int32_t *) &__locale_mmap->tblwuplow_diff;
 /* 	base->tblwcomb */
 /* 		= (const unsigned char *) &__locale_mmap->tblwcomb; */
 	/* width?? */

libc/sysdeps/linux/common/bits/uClibc_locale.h

@@ -192,7 +192,7 @@ struct __uclibc_locale_struct {
 	const unsigned char *tblwctype;
 	const unsigned char *tblwuplow;
 /* 	const unsigned char *tblwcomb; */
-	const int16_t *tblwuplow_diff; /* yes... signed */
+	const int32_t *tblwuplow_diff; /* yes... signed */
 	/* width?? */
 
 	wchar_t decimal_point_wc;