Remove separate locale_is_c arguments

Since e9931bf, ctype_is_c is part of pg_locale_t.  Some functions
passed a pg_locale_t and a bool argument separately.  This can now be
combined into one argument.

Since some callers call MatchText() with locale 0, it is a bit
confusing whether this is all correct.  But it is the case that only
callers that pass a non-zero locale object to MatchText() end up
checking locale->ctype_is_c.  To make that flow a bit more
understandable, add the locale argument to MATCH_LOWER() and GETCHAR()
in like_match.c, instead of implicitly taking it from the outer scope.

Reviewed-by: Jeff Davis <pgsql@j-davis.com>
Discussion: https://www.postgresql.org/message-id/84d415fc-6780-419e-b16c-61a0ca819e2b@eisentraut.org

Author: petere

src/backend/utils/adt/like.c

@@ -33,18 +33,18 @@
 
 
 static int	SB_MatchText(const char *t, int tlen, const char *p, int plen,
-						 pg_locale_t locale, bool locale_is_c);
+						 pg_locale_t locale);
 static text *SB_do_like_escape(text *pat, text *esc);
 
 static int	MB_MatchText(const char *t, int tlen, const char *p, int plen,
-						 pg_locale_t locale, bool locale_is_c);
+						 pg_locale_t locale);
 static text *MB_do_like_escape(text *pat, text *esc);
 
 static int	UTF8_MatchText(const char *t, int tlen, const char *p, int plen,
-						   pg_locale_t locale, bool locale_is_c);
+						   pg_locale_t locale);
 
 static int	SB_IMatchText(const char *t, int tlen, const char *p, int plen,
-						  pg_locale_t locale, bool locale_is_c);
+						  pg_locale_t locale);
 
 static int	GenericMatchText(const char *s, int slen, const char *p, int plen, Oid collation);
 static int	Generic_Text_IC_like(text *str, text *pat, Oid collation);
@@ -91,9 +91,9 @@ wchareq(const char *p1, const char *p2)
  * fold-on-the-fly processing, however.
  */
 static char
-SB_lower_char(unsigned char c, pg_locale_t locale, bool locale_is_c)
+SB_lower_char(unsigned char c, pg_locale_t locale)
 {
-	if (locale_is_c)
+	if (locale->ctype_is_c)
 		return pg_ascii_tolower(c);
 	else
 		return tolower_l(c, locale->info.lt);
@@ -129,7 +129,7 @@ SB_lower_char(unsigned char c, pg_locale_t locale, bool locale_is_c)
 #include "like_match.c"
 
 /* setup to compile like_match.c for single byte case insensitive matches */
-#define MATCH_LOWER(t) SB_lower_char((unsigned char) (t), locale, locale_is_c)
+#define MATCH_LOWER(t, locale) SB_lower_char((unsigned char) (t), locale)
 #define NextChar(p, plen) NextByte((p), (plen))
 #define MatchText SB_IMatchText
 
@@ -158,11 +158,11 @@ GenericMatchText(const char *s, int slen, const char *p, int plen, Oid collation
 	}
 
 	if (pg_database_encoding_max_length() == 1)
-		return SB_MatchText(s, slen, p, plen, 0, true);
+		return SB_MatchText(s, slen, p, plen, 0);
 	else if (GetDatabaseEncoding() == PG_UTF8)
-		return UTF8_MatchText(s, slen, p, plen, 0, true);
+		return UTF8_MatchText(s, slen, p, plen, 0);
 	else
-		return MB_MatchText(s, slen, p, plen, 0, true);
+		return MB_MatchText(s, slen, p, plen, 0);
 }
 
 static inline int
@@ -212,17 +212,17 @@ Generic_Text_IC_like(text *str, text *pat, Oid collation)
 		s = VARDATA_ANY(str);
 		slen = VARSIZE_ANY_EXHDR(str);
 		if (GetDatabaseEncoding() == PG_UTF8)
-			return UTF8_MatchText(s, slen, p, plen, 0, true);
+			return UTF8_MatchText(s, slen, p, plen, 0);
 		else
-			return MB_MatchText(s, slen, p, plen, 0, true);
+			return MB_MatchText(s, slen, p, plen, 0);
 	}
 	else
 	{
 		p = VARDATA_ANY(pat);
 		plen = VARSIZE_ANY_EXHDR(pat);
 		s = VARDATA_ANY(str);
 		slen = VARSIZE_ANY_EXHDR(str);
-		return SB_IMatchText(s, slen, p, plen, locale, locale->ctype_is_c);
+		return SB_IMatchText(s, slen, p, plen, locale);
 	}
 }
 
@@ -330,7 +330,7 @@ bytealike(PG_FUNCTION_ARGS)
 	p = VARDATA_ANY(pat);
 	plen = VARSIZE_ANY_EXHDR(pat);
 
-	result = (SB_MatchText(s, slen, p, plen, 0, true) == LIKE_TRUE);
+	result = (SB_MatchText(s, slen, p, plen, 0) == LIKE_TRUE);
 
 	PG_RETURN_BOOL(result);
 }
@@ -351,7 +351,7 @@ byteanlike(PG_FUNCTION_ARGS)
 	p = VARDATA_ANY(pat);
 	plen = VARSIZE_ANY_EXHDR(pat);
 
-	result = (SB_MatchText(s, slen, p, plen, 0, true) != LIKE_TRUE);
+	result = (SB_MatchText(s, slen, p, plen, 0) != LIKE_TRUE);
 
 	PG_RETURN_BOOL(result);
 }

src/backend/utils/adt/like_match.c

@@ -71,14 +71,13 @@
  */
 
 #ifdef MATCH_LOWER
-#define GETCHAR(t) MATCH_LOWER(t)
+#define GETCHAR(t, locale) MATCH_LOWER(t, locale)
 #else
-#define GETCHAR(t) (t)
+#define GETCHAR(t, locale) (t)
 #endif
 
 static int
-MatchText(const char *t, int tlen, const char *p, int plen,
-		  pg_locale_t locale, bool locale_is_c)
+MatchText(const char *t, int tlen, const char *p, int plen, pg_locale_t locale)
 {
 	/* Fast path for match-everything pattern */
 	if (plen == 1 && *p == '%')
@@ -106,7 +105,7 @@ MatchText(const char *t, int tlen, const char *p, int plen,
 				ereport(ERROR,
 						(errcode(ERRCODE_INVALID_ESCAPE_SEQUENCE),
 						 errmsg("LIKE pattern must not end with escape character")));
-			if (GETCHAR(*p) != GETCHAR(*t))
+			if (GETCHAR(*p, locale) != GETCHAR(*t, locale))
 				return LIKE_FALSE;
 		}
 		else if (*p == '%')
@@ -166,17 +165,16 @@ MatchText(const char *t, int tlen, const char *p, int plen,
 					ereport(ERROR,
 							(errcode(ERRCODE_INVALID_ESCAPE_SEQUENCE),
 							 errmsg("LIKE pattern must not end with escape character")));
-				firstpat = GETCHAR(p[1]);
+				firstpat = GETCHAR(p[1], locale);
 			}
 			else
-				firstpat = GETCHAR(*p);
+				firstpat = GETCHAR(*p, locale);
 
 			while (tlen > 0)
 			{
-				if (GETCHAR(*t) == firstpat)
+				if (GETCHAR(*t, locale) == firstpat)
 				{
-					int			matched = MatchText(t, tlen, p, plen,
-													locale, locale_is_c);
+					int			matched = MatchText(t, tlen, p, plen, locale);
 
 					if (matched != LIKE_FALSE)
 						return matched; /* TRUE or ABORT */
@@ -198,7 +196,7 @@ MatchText(const char *t, int tlen, const char *p, int plen,
 			NextByte(p, plen);
 			continue;
 		}
-		else if (GETCHAR(*p) != GETCHAR(*t))
+		else if (GETCHAR(*p, locale) != GETCHAR(*t, locale))
 		{
 			/* non-wildcard pattern char fails to match text char */
 			return LIKE_FALSE;