Rename KANA2HIRA and HIRA2KANA constants (for mb_convert_kana)

mb_convert_kana is able to convert fullwidth katakana to fullwidth
hiragana (and vice versa). The constants referring to these modes had
names like MBFL_FILT_TL_ZEN2HAN_KANA2HIRA.

The "ZEN2HAN" part of the name is misleading, since these modes do not
convert fullwidth (zenkaku) kana to halfwidth (hankaku). The converted
characters are fullwidth both before and after the conversion. So...
let's name the constants accordingly.

Author: alexdowad

ext/mbstring/libmbfl/filters/mbfilter_tl_jisx0201_jisx0208.c

@@ -165,11 +165,11 @@ int mbfl_convert_kana(int c, int next, bool *consumed, int *second, int mode)
 		} else if (c == 0x30fb) {
 			return 0xff65; /* HALFWIDTH KATAKANA MIDDLE DOT */
 		}
-	} else if (mode & (MBFL_FILT_TL_ZEN2HAN_HIRA2KANA | MBFL_FILT_TL_ZEN2HAN_KANA2HIRA)) {
-		if ((mode & MBFL_FILT_TL_ZEN2HAN_HIRA2KANA) && ((c >= 0x3041 && c <= 0x3093) || c == 0x309d || c == 0x309e)) {
+	} else if (mode & (MBFL_FILT_TL_ZENKAKU_HIRA2KANA | MBFL_FILT_TL_ZENKAKU_KANA2HIRA)) {
+		if ((mode & MBFL_FILT_TL_ZENKAKU_HIRA2KANA) && ((c >= 0x3041 && c <= 0x3093) || c == 0x309d || c == 0x309e)) {
 			/* Zenkaku hiragana to Zenkaku katakana */
 			return c + 0x60;
-		} else if ((mode & MBFL_FILT_TL_ZEN2HAN_KANA2HIRA) && ((c >= 0x30a1 && c <= 0x30f3) || c == 0x30fd || c == 0x30fe)) {
+		} else if ((mode & MBFL_FILT_TL_ZENKAKU_KANA2HIRA) && ((c >= 0x30a1 && c <= 0x30f3) || c == 0x30fd || c == 0x30fe)) {
 			/* Zenkaku katakana to Zenkaku hiragana */
 			return c - 0x60;
 		}

ext/mbstring/libmbfl/filters/mbfilter_tl_jisx0201_jisx0208.h

@@ -42,8 +42,8 @@
 #define MBFL_FILT_TL_HAN2ZEN_GLUE      0x00000800
 #define MBFL_FILT_TL_ZEN2HAN_KATAKANA  0x00001000
 #define MBFL_FILT_TL_ZEN2HAN_HIRAGANA  0x00002000
-#define MBFL_FILT_TL_ZEN2HAN_HIRA2KANA 0x00010000
-#define MBFL_FILT_TL_ZEN2HAN_KANA2HIRA 0x00020000
+#define MBFL_FILT_TL_ZENKAKU_HIRA2KANA 0x00010000
+#define MBFL_FILT_TL_ZENKAKU_KANA2HIRA 0x00020000
 #define MBFL_FILT_TL_HAN2ZEN_COMPAT1   0x00100000
 #define MBFL_FILT_TL_ZEN2HAN_COMPAT1   0x00200000
 #define MBFL_FILT_TL_HAN2ZEN_MASK ( \
@@ -62,8 +62,8 @@
 	MBFL_FILT_TL_ZEN2HAN_SPACE | \
 	MBFL_FILT_TL_ZEN2HAN_KATAKANA | \
 	MBFL_FILT_TL_ZEN2HAN_HIRAGANA | \
-	MBFL_FILT_TL_ZEN2HAN_HIRA2KANA | \
-	MBFL_FILT_TL_ZEN2HAN_KANA2HIRA | \
+	MBFL_FILT_TL_ZENKAKU_HIRA2KANA | \
+	MBFL_FILT_TL_ZENKAKU_KANA2HIRA | \
 	MBFL_FILT_TL_ZEN2HAN_COMPAT1)
 
 extern const struct mbfl_convert_vtbl vtbl_tl_jisx0201_jisx0208;

ext/mbstring/mbstring.c

@@ -2910,10 +2910,10 @@ PHP_FUNCTION(mb_convert_kana)
 				opt |= MBFL_FILT_TL_HAN2ZEN_GLUE;
 				break;
 			case 'C':
-				opt |= MBFL_FILT_TL_ZEN2HAN_HIRA2KANA;
+				opt |= MBFL_FILT_TL_ZENKAKU_HIRA2KANA;
 				break;
 			case 'c':
-				opt |= MBFL_FILT_TL_ZEN2HAN_KANA2HIRA;
+				opt |= MBFL_FILT_TL_ZENKAKU_KANA2HIRA;
 				break;
 			case 'M':
 				/* TODO: figure out what 'M' and 'm' are for, and rename the constant