Update soundex to new fmgr interface and fix algorithm

contrib/soundex/Makefile

@@ -1,10 +1,10 @@
 #
-# $Header: /cvsroot/pgsql/contrib/soundex/Attic/Makefile,v 1.7 2000/07/09 13:13:33 petere Exp $
+# $Header: /cvsroot/pgsql/contrib/soundex/Attic/Makefile,v 1.8 2000/10/04 19:25:34 petere Exp $
 #
 
 subdir = contrib/soundex
 top_builddir = ../..
-include ../../src/Makefile.global
+include $(top_builddir)/src/Makefile.global
 
 NAME	:= soundex
 SONAME	:= $(NAME)$(DLSUFFIX)
@@ -14,7 +14,7 @@ CFLAGS += -I. $(CFLAGS_SL)
 all: $(SONAME) $(NAME).sql
 
 $(NAME).sql: $(NAME).sql.in
-	sed -e 's:MODULE_PATHNAME:$(datadir)/contrib/$(SONAME):g' < $< > $@
+	sed 's,@MODULE_FILENAME@,$(libdir)/contrib/$(SONAME),g' $< >$@
 
 install: all installdirs
 	$(INSTALL_SHLIB) $(SONAME)	$(libdir)/contrib
@@ -28,7 +28,7 @@ uninstall:
 	rm -f $(libdir)/contrib/$(SONAME) $(datadir)/contrib/$(NAME).sql $(docdir)/contrib/README.$(NAME)
 
 clean distclean maintainer-clean:
-	rm -f $(SONAME) $(NAME).sql
+	rm -f $(SONAME) $(NAME).o $(NAME).sql
 
 depend dep:
 	$(CC) -MM -MG $(CFLAGS) *.c > depend

contrib/soundex/README.soundex

@@ -1,3 +1,17 @@
+This directory contains a module that implements the "Soundex" code as
+a PostgreSQL user-defined function.  The Soundex system is a method of
+matching similar sounding names (or any words) to the same code.  It
+was initially used by the United States Census in 1880, 1900, and
+1910, but it has little use beyond English names (or the English
+pronunciation of names), and it is not a linguistic tool.
+
+To install it, first configure the main source tree, then run make;
+make install in this directory.  Finally, load the function definition
+with psql:
+
+    psql -f PREFIX/share/contrib/soundex.sql
+
+The following are some usage examples:
 
 SELECT text_soundex('hello world!');
 
@@ -50,4 +64,3 @@ WHERE text_sx_eq(nm,'john')\g
 SELECT *
 from s
 where s.nm #= 'john';
-

contrib/soundex/soundex.c

@@ -1,79 +1,79 @@
-/*****************************************************************************/
-/* soundex.c */
-/*****************************************************************************/
-
+/* $Header: /cvsroot/pgsql/contrib/soundex/Attic/soundex.c,v 1.7 2000/10/04 19:25:34 petere Exp $ */
+#include "postgres.h"
+#include "fmgr.h"
+#include "utils/builtins.h"
 #include <ctype.h>
 #include <string.h>
 #include <stdio.h>
 
-#include "postgres.h"			/* for char16, etc. */
 
-#include "utils/palloc.h"		/* for palloc */
+Datum
+text_soundex(PG_FUNCTION_ARGS);
 
-/* prototypes for soundex functions */
-text	   *text_soundex(text *t);
-char	   *soundex(char *instr, char *outstr);
+static void
+soundex(const char *instr, char *outstr);
 
-text *
-text_soundex(text *t)
-{
-	text	   *new_t;
+#define SOUNDEX_LEN 4
 
-	char		outstr[6 + 1];	/* max length of soundex is 6 */
-	char	   *instr;
 
-	/* make a null-terminated string */
-	instr = palloc(VARSIZE(t) + 1);
-	memcpy(instr, VARDATA(t), VARSIZE(t) - VARHDRSZ);
-	instr[VARSIZE(t) - VARHDRSZ] = (char) 0;
+#define _textin(str) DirectFunctionCall1(textin, CStringGetDatum(str))
+#define _textout(str) DatumGetPointer(DirectFunctionCall1(textout, PointerGetDatum(str)))
 
-	/* load soundex into outstr */
-	soundex(instr, outstr);
 
-	/* Now the outstr contains the soundex of instr */
-	/* copy outstr to new_t */
-	new_t = (text *) palloc(strlen(outstr) + VARHDRSZ);
-	memset(new_t, 0, strlen(outstr) + 1);
-	VARSIZE(new_t) = strlen(outstr) + VARHDRSZ;
-	memcpy((void *) VARDATA(new_t),
-		   (void *) outstr,
-		   strlen(outstr));
+#ifndef SOUNDEX_TEST
+/*
+ * SQL function: text_soundex(text) returns text
+ */
+Datum
+text_soundex(PG_FUNCTION_ARGS)
+{
+	char		outstr[SOUNDEX_LEN + 1];
+	char	   *arg;
+
+	arg = _textout(PG_GETARG_TEXT_P(0));
 
-	/* free instr */
-	pfree(instr);
+	soundex(arg, outstr);
 
-	return (new_t);
+	PG_RETURN_TEXT_P(_textin(outstr));
 }
+#endif /* not SOUNDEX_TEST */
+
+
+/*                                  ABCDEFGHIJKLMNOPQRSTUVWXYZ */
+static const char *soundex_table = "01230120022455012623010202";
+#define soundex_code(letter) soundex_table[toupper(letter) - 'A']
+
 
-char *
-soundex(char *instr, char *outstr)
+static void
+soundex(const char *instr, char *outstr)
 {
-	/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
-	char	   *table = "01230120022455012623010202";
-	int			count = 0;
+	int			count;
 
+	AssertArg(instr);
+	AssertArg(outstr);
+
+	outstr[SOUNDEX_LEN] = '\0';
+
+	/* Skip leading non-alphabetic characters */
 	while (!isalpha(instr[0]) && instr[0])
 		++instr;
 
+	/* No string left */
 	if (!instr[0])
-	{							/* Hey!  Where'd the string go? */
-		outstr[0] = (char) 0;
-		return outstr;
-	}
-
-	if (toupper(instr[0]) == 'P' && toupper(instr[1]) == 'H')
 	{
-		instr[0] = 'F';
-		instr[1] = 'A';
+		outstr[0] = (char) 0;
+		return;
 	}
 
+	/* Take the first letter as is */
 	*outstr++ = (char) toupper(*instr++);
 
-	while (*instr && count < 5)
+	count = 1;
+	while (*instr && count < SOUNDEX_LEN)
 	{
-		if (isalpha(*instr) && *instr != *(instr - 1))
+		if (isalpha(*instr) && soundex_code(*instr) != soundex_code(*(instr - 1)))
 		{
-			*outstr = table[toupper(instr[0]) - 'A'];
+			*outstr = soundex_code(instr[0]);
 			if (*outstr != '0')
 			{
 				++outstr;
@@ -83,6 +83,33 @@ soundex(char *instr, char *outstr)
 		++instr;
 	}
 
-	*outstr = '\0';
-	return (outstr);
+	/* Fill with 0's */
+	while (count < SOUNDEX_LEN)
+	{
+		*outstr = '0';
+		++outstr;
+		++count;
+	}
+}
+
+
+
+#ifdef SOUNDEX_TEST
+int
+main (int argc, char *argv[])
+{
+	if (argc < 2)
+	{
+		fprintf(stderr, "usage: %s string\n", argv[0]);
+		return 1;
+	}
+	else
+	{
+		char output[SOUNDEX_LEN + 1];
+
+		soundex(argv[1], output);
+		printf("soundex(%s) = %s\n", argv[1], output);
+		return 0;
+	}
 }
+#endif /* SOUNDEX_TEST */

contrib/soundex/soundex.sql.in

@@ -1,4 +1,5 @@
-
 CREATE FUNCTION text_soundex(text) RETURNS text
-   AS 'MODULE_PATHNAME' LANGUAGE 'c';
+  AS '@MODULE_FILENAME@', 'text_soundex' LANGUAGE 'newC';
 
+CREATE FUNCTION soundex(text) RETURNS text
+  AS '@MODULE_FILENAME@', 'text_soundex' LANGUAGE 'newC';