New functions in CHARSET_INFO structure

include/m_ctype.h

@@ -112,6 +112,8 @@ typedef struct charset_info_st
   int     (*ismbchar)(struct charset_info_st *, const char *, const char *);
   my_bool (*ismbhead)(struct charset_info_st *, uint);
   int     (*mbcharlen)(struct charset_info_st *, uint);
+  uint    (*numchars)(struct charset_info_st *, const char *b, const char *e);
+  uint    (*charpos)(struct charset_info_st *, const char *b, const char *e, uint pos);
   
   /* Unicode convertion */
   int (*mb_wc)(struct charset_info_st *cs,my_wc_t *wc,
@@ -252,6 +254,9 @@ int my_wildcmp_8bit(CHARSET_INFO *,
 		    const char *wildstr,const char *wildend,
 		    int escape, int w_one, int w_many);
 
+uint my_numchars_8bit(CHARSET_INFO *, const char *b, const char *e);
+uint my_charpos_8bit(CHARSET_INFO *, const char *b, const char *e, uint pos);
+
 
 #ifdef USE_MB
 /* Functions for multibyte charsets */
@@ -266,6 +271,9 @@ int my_wildcmp_mb(CHARSET_INFO *,
 		  const char *str,const char *str_end,
 		  const char *wildstr,const char *wildend,
 		  int escape, int w_one, int w_many);
+uint my_numchars_mb(CHARSET_INFO *, const char *b, const char *e);
+uint my_charpos_mb(CHARSET_INFO *, const char *b, const char *e, uint pos);
+
 #endif
 
 #define	_U	01	/* Upper case */

mysys/charset.c

@@ -84,6 +84,8 @@ static void simple_cs_init_functions(CHARSET_INFO *cs)
   cs->strntod     = my_strntod_8bit;
   cs->scan	  = my_scan_8bit;
   cs->mbmaxlen    = 1;
+  cs->numchars    = my_numchars_8bit;
+  cs->charpos     = my_charpos_8bit;
 }
 
 

strings/ctype-big5.c

@@ -6254,6 +6254,8 @@ CHARSET_INFO my_charset_big5 =
     ismbchar_big5,
     ismbhead_big5,
     mbcharlen_big5,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_big5,	/* mb_wc       */
     my_wc_mb_big5,	/* wc_mb       */
     my_caseup_str_mb,

strings/ctype-bin.c

@@ -292,6 +292,8 @@ CHARSET_INFO my_charset_bin =
     NULL,			/* ismbchar      */
     NULL,			/* ismbhead      */
     NULL,			/* mbcharlen     */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_bin,		/* mb_wc         */
     my_wc_mb_bin,		/* wc_mb         */
     my_caseup_str_bin,		/* caseup_str    */

strings/ctype-czech.c

@@ -628,6 +628,8 @@ CHARSET_INFO my_charset_czech =
     NULL,		/* ismbchar  */
     NULL,		/* ismbhead  */
     NULL,		/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc   */
     my_wc_mb_8bit,	/* wc_mb   */
     my_caseup_str_8bit,

strings/ctype-euc_kr.c

@@ -8662,6 +8662,8 @@ CHARSET_INFO my_charset_euc_kr =
     ismbchar_euc_kr,
     ismbhead_euc_kr,
     mbcharlen_euc_kr,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_euc_kr,	/* mb_wc   */
     my_wc_mb_euc_kr,	/* wc_mb   */
     my_caseup_str_mb,

strings/ctype-extra.c

@@ -2828,6 +2828,8 @@ CHARSET_INFO compiled_charsets[] = {
     NULL,		/* ismbchar   */
     NULL,		/* ismbhead   */
     NULL,		/* mbcharlen  */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc   */
     my_wc_mb_8bit,	/* wc_mb   */
     my_caseup_str_8bit,
@@ -2877,6 +2879,8 @@ CHARSET_INFO compiled_charsets[] = {
     NULL,		/* ismbchar   */
     NULL,		/* ismbhead   */
     NULL,		/* mbcharlen  */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc      */
     my_wc_mb_8bit,	/* wc_mb      */
     my_caseup_str_8bit,
@@ -2925,6 +2929,8 @@ CHARSET_INFO compiled_charsets[] = {
     NULL,		/* ismbchar  */
     NULL,		/* ismbhead  */
     NULL,		/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc   */
     my_wc_mb_8bit,	/* wc_mb   */
     my_caseup_str_8bit,
@@ -3937,7 +3943,8 @@ CHARSET_INFO compiled_charsets[] = {
     NULL,
     NULL,
     NULL,
-
+    NULL,
+    NULL,
     NULL,		 /* mb_wc      */
     NULL,		 /* wc_mb      */
     

strings/ctype-gb2312.c

@@ -5712,6 +5712,8 @@ CHARSET_INFO my_charset_gb2312 =
     ismbchar_gb2312,
     ismbhead_gb2312,
     mbcharlen_gb2312,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_gb2312,	/* mb_wc      */
     my_wc_mb_gb2312,	/* wc_mb      */
     my_caseup_str_mb,

strings/ctype-gbk.c

@@ -9909,6 +9909,8 @@ CHARSET_INFO my_charset_gbk =
     ismbchar_gbk,
     ismbhead_gbk,
     mbcharlen_gbk,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_gbk,	/* mb_wc      */
     my_wc_mb_gbk,	/* wc_mb      */
     my_caseup_str_mb,

strings/ctype-latin1.c

@@ -198,6 +198,8 @@ CHARSET_INFO my_charset_latin1 =
     NULL,		/* ismbchar  */
     NULL,		/* ismbhead  */
     NULL,		/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_latin1,	/* mb_wc     */
     my_wc_mb_latin1,	/* wc_mb     */
     my_caseup_str_8bit,

strings/ctype-latin1_de.c

@@ -369,6 +369,8 @@ CHARSET_INFO my_charset_latin1_de =
     NULL,		/* ismbchar  */
     NULL,		/* ismbhead  */
     NULL,		/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc     */
     my_wc_mb_8bit,	/* wc_mb     */
     my_caseup_str_8bit,

strings/ctype-mb.c

@@ -276,5 +276,33 @@ int my_wildcmp_mb(CHARSET_INFO *cs,
   return (str != str_end ? 1 : 0);
 }
 
+uint my_numchars_mb(CHARSET_INFO *cs __attribute__((unused)),
+		      const char *b, const char *e)
+{
+  register uint32 n=0,mblen;
+  while (b < e) 
+  {
+    b+= (mblen= my_ismbchar(cs,b,e)) ? mblen : 1;
+    ++n;
+  }
+  return n;
+}
+
+uint my_charpos_mb(CHARSET_INFO *cs __attribute__((unused)),
+		     const char *b  __attribute__((unused)),
+		     const char *e  __attribute__((unused)),
+		     uint pos)
+{
+  uint res=0, mblen;
+  const char *b0;
+  
+  while (pos && b<e)
+  {
+    b+= (mblen= my_ismbchar(cs,b,e)) ? mblen : 1;
+    pos--;
+  }
+  return b-b0;
+}
+
 
 #endif

strings/ctype-simple.c

@@ -1036,3 +1036,17 @@ void my_fill_8bit(CHARSET_INFO *cs __attribute__((unused)),
 {
   bfill(s,l,fill);
 }
+
+uint my_numchars_8bit(CHARSET_INFO *cs __attribute__((unused)),
+		      const char *b, const char *e)
+{
+  return e-b;
+}
+
+uint my_charpos_8bit(CHARSET_INFO *cs __attribute__((unused)),
+		     const char *b  __attribute__((unused)),
+		     const char *e  __attribute__((unused)),
+		     uint pos)
+{
+  return pos;
+}

strings/ctype-sjis.c

@@ -4496,6 +4496,8 @@ CHARSET_INFO my_charset_sjis =
     ismbchar_sjis,
     ismbhead_sjis,
     mbcharlen_sjis,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_sjis,	/* mb_wc */
     my_wc_mb_sjis,	/* wc_mb */
     my_caseup_str_8bit,

strings/ctype-tis620.c

@@ -719,6 +719,8 @@ CHARSET_INFO my_charset_tis620 =
     NULL,		/* ismbchar  */
     NULL,		/* ismbhead  */
     NULL,		/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,	/* mb_wc     */
     my_wc_mb_8bit,	/* wc_mb     */
     my_caseup_str_8bit,

strings/ctype-ujis.c

@@ -8453,6 +8453,8 @@ CHARSET_INFO my_charset_ujis =
     ismbchar_ujis,
     ismbhead_ujis,
     mbcharlen_ujis,
+    my_numchars_mb,
+    my_charpos_mb,
     my_mb_wc_euc_jp,	 /* mb_wc       */
     my_wc_mb_euc_jp,	 /* wc_mb       */
     my_caseup_str_mb,

strings/ctype-utf8.c

@@ -1998,6 +1998,8 @@ CHARSET_INFO my_charset_utf8 =
     my_ismbchar_utf8,	/* ismbchar     */
     my_ismbhead_utf8,	/* ismbhead     */
     my_mbcharlen_utf8,	/* mbcharlen    */
+    my_numchars_mb,
+    my_charpos_mb,
     my_utf8_uni,	/* mb_wc        */
     my_uni_utf8,	/* wc_mb        */
     my_caseup_str_utf8,
@@ -3064,6 +3066,21 @@ cnv:
   return (int) (dst-db);
 }
 
+static
+uint my_numchars_ucs2(CHARSET_INFO *cs __attribute__((unused)),
+		      const char *b, const char *e)
+{
+  return (e-b)/2;
+}
+
+static
+uint my_charpos_ucs2(CHARSET_INFO *cs __attribute__((unused)),
+		     const char *b  __attribute__((unused)),
+		     const char *e  __attribute__((unused)),
+		     uint pos)
+{
+  return pos/2;
+}
 
 CHARSET_INFO my_charset_ucs2 =
 {
@@ -3088,6 +3105,8 @@ CHARSET_INFO my_charset_ucs2 =
     my_ismbchar_ucs2,	/* ismbchar     */
     my_ismbhead_ucs2,	/* ismbhead     */
     my_mbcharlen_ucs2,	/* mbcharlen    */
+    my_numchars_ucs2,
+    my_charpos_ucs2,
     my_ucs2_uni,	/* mb_wc        */
     my_uni_ucs2,	/* wc_mb        */
     my_caseup_str_ucs2,

strings/ctype-win1250ch.c

@@ -663,6 +663,8 @@ CHARSET_INFO my_charset_win1250ch =
     NULL,			/* ismbchar  */
     NULL,			/* ismbhead  */
     NULL,			/* mbcharlen */
+    my_numchars_8bit,
+    my_charpos_8bit,
     my_mb_wc_8bit,		/* mb_wc     */
     my_wc_mb_8bit,		/* wc_mb     */
     my_caseup_str_8bit,