aboutsummaryrefslogtreecommitdiff
path: root/src/backend/regex/utils.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/backend/regex/utils.c')
-rw-r--r--src/backend/regex/utils.c388
1 files changed, 159 insertions, 229 deletions
diff --git a/src/backend/regex/utils.c b/src/backend/regex/utils.c
index 67b9f2a737a..0308140118b 100644
--- a/src/backend/regex/utils.c
+++ b/src/backend/regex/utils.c
@@ -1,202 +1,97 @@
/*
* misc conversion functions between pg_wchar and other encodings.
* Tatsuo Ishii
- * $Id: utils.c,v 1.2 1998/04/27 17:07:53 scrappy Exp $
+ * $Id: utils.c,v 1.3 1998/06/16 07:29:29 momjian Exp $
*/
#include <regex/pg_wchar.h>
+
/*
- * convert EUC to pg_wchar (EUC process code)
- * caller should allocate enough space for "to"
+ * conversion to pg_wchar is done by "table driven."
+ * to add an encoding support, define mb2wchar_with_len(), mblen()
+ * for the particular encoding. Note that if the encoding is only
+ * supported in the client, you don't need to define
+ * mb2wchar_with_len() function (SJIS is the case).
*/
-static void pg_euc2wchar(const unsigned char *from, pg_wchar *to)
-{
- while (*from) {
- if (*from == SS2) {
- from++;
- *to = *from++;
- } else if (*from == SS3) {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- } else if (*from & 0x80) {
- *to = *from++ << 8;
- *to |= *from++;
- } else {
- *to = *from++;
- }
- to++;
- }
- *to = 0;
-}
-
-static void pg_eucjp2wchar(const unsigned char *from, pg_wchar *to)
-{
- pg_euc2wchar(from,to);
-}
-
-static void pg_euckr2wchar(const unsigned char *from, pg_wchar *to)
-{
- pg_euc2wchar(from,to);
-}
+typedef struct {
+ void (*mb2wchar_with_len)(); /* convert a multi-byte string to a wchar */
+ int (*mblen)(); /* returns the length of a multi-byte word */
+} pg_wchar_tbl;
-static void pg_eucch2wchar(const unsigned char *from, pg_wchar *to)
+static void pg_euc2wchar_with_len
+(const unsigned char *from, pg_wchar *to, int len)
{
- while (*from) {
+ while (*from && len > 0) {
if (*from == SS2) {
from++;
- *to = 0x3f00 & (*from++ << 8);
- *to = *from++;
+ len--;
+ *to = 0xff & *from++;
+ len--;
} else if (*from == SS3) {
from++;
*to = *from++ << 8;
*to |= 0x3f & *from++;
+ len -= 3;
} else if (*from & 0x80) {
*to = *from++ << 8;
*to |= *from++;
+ len -= 2;
} else {
*to = *from++;
+ len--;
}
to++;
}
*to = 0;
}
-static void pg_euccn2wchar(const unsigned char *from, pg_wchar *to)
+static int pg_euc_mblen(const unsigned char *s)
{
- while (*from) {
- if (*from == SS2) {
- from++;
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- } else if (*from == SS3) {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- } else if (*from & 0x80) {
- *to = *from++ << 8;
- *to |= *from++;
- } else {
- *to = *from++;
- }
- to++;
+ int len;
+
+ if (*s == SS2) {
+ len = 2;
+ } else if (*s == SS3) {
+ len = 3;
+ } else if (*s & 0x80) {
+ len = 2;
+ } else {
+ len = 1;
}
- *to = 0;
+ return(len);
}
/*
- * convert UTF-8 to pg_wchar (UCS-2)
- * caller should allocate enough space for "to"
+ * EUC_JP
*/
-static void pg_utf2wchar(const unsigned char *from, pg_wchar *to)
+static void pg_eucjp2wchar_with_len
+(const unsigned char *from, pg_wchar *to, int len)
{
- unsigned char c1,c2,c3;
- while (*from) {
- if ((*from & 0x80) == 0) {
- *to = *from++;
- } else if ((*from & 0xe0) == 0xc0) {
- c1 = *from++ & 0x1f;
- c2 = *from++ & 0x3f;
- *to = c1 << 6;
- *to |= c2;
- } else if ((*from & 0xe0) == 0xe0) {
- c1 = *from++ & 0x0f;
- c2 = *from++ & 0x3f;
- c3 = *from++ & 0x3f;
- *to = c1 << 12;
- *to |= c2 << 6;
- *to |= c3;
- }
- to++;
- }
- *to = 0;
+ pg_euc2wchar_with_len(from,to,len);
}
-/*
- * convert mule internal code to pg_wchar.
- * in this case pg_wchar consists of following 4 bytes:
- *
- * 0x00(unused)
- * 0x00(ASCII)|leading character (one of LC1, LC12, LC2 or LC22)
- * 0x00(ASCII,1 byte code)|other than 0x00(2 byte code)
- * the lowest byte of the code
- *
- * note that Type N (variable length byte encoding) cannot be represented by
- * this schema. sorry.
- * caller should allocate enough space for "to"
- */
-static void pg_mule2wchar(const unsigned char *from, pg_wchar *to)
+static int pg_eucjp_mblen(const unsigned char *s)
{
- while (*from) {
- if (IS_LC1(*from)) {
- *to = *from++ << 16;
- *to |= *from++;
- } else if (IS_LCPRV1(*from)) {
- from++;
- *to = *from++ << 16;
- *to |= *from++;
- } else if (IS_LC2(*from)) {
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- } else if (IS_LCPRV2(*from)) {
- from++;
- *to = *from++ << 16;
- *to |= *from++ << 8;
- *to |= *from++;
- } else { /* assume ASCII */
- *to = *from++;
- }
- to++;
- }
- *to = 0;
+ return(pg_euc_mblen(s));
}
/*
- * convert EUC to pg_wchar (EUC process code)
- * caller should allocate enough space for "to"
- * len: length of from.
- * "from" not necessarily null terminated.
+ * EUC_KR
*/
-static void pg_euc2wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
-{
- while (*from && len > 0) {
- if (*from == SS2) {
- from++;
- len--;
- *to = 0xff & *from++;
- len--;
- } else if (*from == SS3) {
- from++;
- *to = *from++ << 8;
- *to |= 0x3f & *from++;
- len -= 3;
- } else if (*from & 0x80) {
- *to = *from++ << 8;
- *to |= *from++;
- len -= 2;
- } else {
- *to = *from++;
- len--;
- }
- to++;
- }
- *to = 0;
-}
-
-static void pg_eucjp2wchar_with_len
+static void pg_euckr2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len)
{
pg_euc2wchar_with_len(from,to,len);
}
-static void pg_euckr2wchar_with_len
-(const unsigned char *from, pg_wchar *to, int len)
+static int pg_euckr_mblen(const unsigned char *s)
{
- pg_euc2wchar_with_len(from,to,len);
+ return(pg_euc_mblen(s));
}
-static void pg_eucch2wchar_with_len
+/*
+ * EUC_CN
+ */
+static void pg_euccn2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len)
{
while (*from && len > 0) {
@@ -224,7 +119,26 @@ static void pg_eucch2wchar_with_len
*to = 0;
}
-static void pg_euccn2wchar_with_len
+static int pg_euccn_mblen(const unsigned char *s)
+{
+ int len;
+
+ if (*s == SS2) {
+ len = 3;
+ } else if (*s == SS3) {
+ len = 3;
+ } else if (*s & 0x80) {
+ len = 2;
+ } else {
+ len = 1;
+ }
+ return(len);
+}
+
+/*
+ * EUC_TW
+ */
+static void pg_euctw2wchar_with_len
(const unsigned char *from, pg_wchar *to, int len)
{
while (*from && len > 0) {
@@ -253,6 +167,22 @@ static void pg_euccn2wchar_with_len
*to = 0;
}
+static int pg_euctw_mblen(const unsigned char *s)
+{
+ int len;
+
+ if (*s == SS2) {
+ len = 4;
+ } else if (*s == SS3) {
+ len = 3;
+ } else if (*s & 0x80) {
+ len = 2;
+ } else {
+ len = 1;
+ }
+ return(len);
+}
+
/*
* convert UTF-8 to pg_wchar (UCS-2)
* caller should allocate enough space for "to"
@@ -286,6 +216,20 @@ static void pg_utf2wchar_with_len(const unsigned char *from, pg_wchar *to, int l
*to = 0;
}
+static int pg_utf_mblen(const unsigned char *s)
+{
+ int len = 1;
+
+ if ((*s & 0x80) == 0) {
+ len = 1;
+ } else if ((*s & 0xe0) == 0xc0) {
+ len = 2;
+ } else if ((*s & 0xe0) == 0xe0) {
+ len = 3;
+ }
+ return(len);
+}
+
/*
* convert mule internal code to pg_wchar
* caller should allocate enough space for "to"
@@ -324,115 +268,89 @@ static void pg_mule2wchar_with_len(const unsigned char *from, pg_wchar *to, int
*to = 0;
}
-static int pg_euc_mblen(const unsigned char *s)
+static int pg_mule_mblen(const unsigned char *s)
{
int len;
- if (*s == SS2) {
- len = 2;
- } else if (*s == SS3) {
- len = 3;
- } else if (*s & 0x80) {
+ if (IS_LC1(*s)) {
len = 2;
- } else {
- len = 1;
- }
- return(len);
-}
-
-static int pg_eucjp_mblen(const unsigned char *s)
-{
- return(pg_euc_mblen(s));
-}
-
-static int pg_euckr_mblen(const unsigned char *s)
-{
- return(pg_euc_mblen(s));
-}
-
-static int pg_eucch_mblen(const unsigned char *s)
-{
- int len;
-
- if (*s == SS2) {
+ } else if (IS_LCPRV1(*s)) {
len = 3;
- } else if (*s == SS3) {
+ } else if (IS_LC2(*s)) {
len = 3;
- } else if (*s & 0x80) {
- len = 2;
- } else {
+ } else if (IS_LCPRV2(*s)) {
+ len = 4;
+ } else { /* assume ASCII */
len = 1;
}
return(len);
}
-static int pg_euccn_mblen(const unsigned char *s)
+/*
+ * ISO8859-1
+ */
+static void pg_latin12wchar_with_len(const unsigned char *from, pg_wchar *to, int len)
{
- int len;
-
- if (*s == SS2) {
- len = 4;
- } else if (*s == SS3) {
- len = 3;
- } else if (*s & 0x80) {
- len = 2;
- } else {
- len = 1;
+ while (*from && len-- > 0) {
+ *to++ = *from++;
}
- return(len);
+ *to = 0;
}
-static int pg_utf_mblen(const unsigned char *s)
+static int pg_latin1_mblen(const unsigned char *s)
{
- int len = 1;
-
- if ((*s & 0x80) == 0) {
- len = 1;
- } else if ((*s & 0xe0) == 0xc0) {
- len = 2;
- } else if ((*s & 0xe0) == 0xe0) {
- len = 3;
- }
- return(len);
+ return(1);
}
-static int pg_mule_mblen(const unsigned char *s)
+/*
+ * SJIS
+ */
+static int pg_sjis_mblen(const unsigned char *s)
{
int len;
- if (IS_LC1(*s)) {
+ if (*s >= 0xa1 && *s <= 0xdf) { /* 1 byte kana? */
+ len = 1;
+ } else if (*s > 0x7f) { /* kanji? */
len = 2;
- } else if (IS_LCPRV1(*s)) {
- len = 3;
- } else if (IS_LC2(*s)) {
- len = 3;
- } else if (IS_LCPRV2(*s)) {
- len = 4;
- } else { /* assume ASCII */
+ } else { /* should be ASCII */
len = 1;
}
return(len);
}
-typedef struct {
- void (*mb2wchar)(); /* convert a multi-byte string to a wchar */
- void (*mb2wchar_with_len)(); /* convert a multi-byte string to a wchar
- with a limited length */
- int (*mblen)(); /* returns the length of a multi-byte word */
-} pg_wchar_tbl;
-
static pg_wchar_tbl pg_wchar_table[] = {
- {pg_eucjp2wchar, pg_eucjp2wchar_with_len, pg_eucjp_mblen},
- {pg_eucch2wchar, pg_eucch2wchar_with_len, pg_eucch_mblen},
- {pg_euckr2wchar, pg_euckr2wchar_with_len, pg_euckr_mblen},
- {pg_euccn2wchar, pg_euccn2wchar_with_len, pg_euccn_mblen},
- {pg_utf2wchar, pg_utf2wchar_with_len, pg_utf_mblen},
- {pg_mule2wchar, pg_mule2wchar_with_len, pg_mule_mblen}};
+ {pg_eucjp2wchar_with_len, pg_eucjp_mblen},
+ {pg_euccn2wchar_with_len, pg_euccn_mblen},
+ {pg_euckr2wchar_with_len, pg_euckr_mblen},
+ {pg_euctw2wchar_with_len, pg_euctw_mblen},
+ {pg_utf2wchar_with_len, pg_utf_mblen},
+ {pg_mule2wchar_with_len, pg_mule_mblen},
+ {pg_latin12wchar_with_len, pg_latin1_mblen},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, 0},
+ {0, pg_sjis_mblen}
+};
+
+/*
+ *########################################################################
+ *
+ * Public functions
+ *
+ *########################################################################
+ */
/* convert a multi-byte string to a wchar */
void pg_mb2wchar(const unsigned char *from, pg_wchar *to)
{
- (*pg_wchar_table[MB].mb2wchar)(from,to);
+ (*pg_wchar_table[MB].mb2wchar_with_len)(from,to,strlen(from));
}
/* convert a multi-byte string to a wchar with a limited length */
@@ -447,6 +365,18 @@ int pg_mblen(const unsigned char *mbstr)
return((*pg_wchar_table[MB].mblen)(mbstr));
}
+/* returns the byte length of a multi-byte word for an encoding */
+int pg_encoding_mblen(int encoding, const unsigned char *mbstr)
+{
+ return((*pg_wchar_table[encoding].mblen)(mbstr));
+}
+
+/* returns the byte length of a word for mule internal code */
+int pg_mic_mblen(const unsigned char *mbstr)
+{
+ return(pg_mule_mblen(mbstr));
+}
+
/* returns the length (counted as a wchar) of a multi-byte string */
int pg_mbstrlen(const unsigned char *mbstr)
{
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-22 23:15:08 +0000