#
-# $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)
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
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
+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!');
SELECT *
from s
where s.nm #= 'john';
-
-/*****************************************************************************/
-/* 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
#include
#include
-#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;
++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 */
projects / postgresql.git / commitdiff