Support Docs & Contrib

contrib/soundex/soundex.c

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+/*****************************************************************************/
+/* soundex.c */
+/*****************************************************************************/
+
+#include <string.h>
+#include <stdio.h>
+#include "postgres.h"	  /* for char16, etc. */
+#include "utils/palloc.h" /* for palloc */
+#include "libpq-fe.h" /* for TUPLE */
+#include <stdio.h>
+#include <ctype.h>
+
+/* prototype for soundex function */
+char *soundex(char *instr, char *outstr);
+
+text *text_soundex(text *t)
+{
+                /* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
+    char *table = "01230120022455012623010202";
+    int count = 0;
+    text *new_t;
+
+    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;
+
+    /* 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));
+
+    /* free instr */
+    pfree(instr);
+
+    return(new_t);
+}
+
+char *soundex(char *instr, char *outstr)
+{                   /* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
+    char *table = "01230120022455012623010202";
+    int count = 0;
+
+    while(!isalpha(instr[0]) && instr[0])
+        ++instr;
+
+    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++ = (char)toupper(*instr++);
+
+    while(*instr && count < 5) {
+        if(isalpha(*instr) && *instr != *(instr-1)) {
+            *outstr = table[toupper(instr[0]) - 'A'];
+            if(*outstr != '0') {
+                ++outstr;
+                ++count;
+            }
+        }
+        ++instr;
+    }
+
+    *outstr = '\0';
+    return(outstr);
+}
+

contrib/soundex/soundex.sql

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+--------------- soundex.sql:
+
+CREATE FUNCTION text_soundex(text) RETURNS text
+   AS '/usr/local/postgres/postgres95/src/funcs/soundex.so' LANGUAGE 'c';
+
+SELECT text_soundex('hello world!');
+
+CREATE TABLE s (nm text)\g
+
+insert into s values ('john')\g
+insert into s values ('joan')\g
+insert into s values ('wobbly')\g
+
+select * from s
+where text_soundex(nm) = text_soundex('john')\g
+
+select nm from s a, s b
+where text_soundex(a.nm) = text_soundex(b.nm)
+and a.oid <> b.oid\g
+
+CREATE FUNCTION text_sx_eq(text, text) RETURNS bool AS
+'select text_soundex($1) = text_soundex($2)'
+LANGUAGE 'sql'\g
+
+CREATE FUNCTION text_sx_lt(text,text) RETURNS bool AS
+'select text_soundex($1) < text_soundex($2)'
+LANGUAGE 'sql'\g
+
+CREATE FUNCTION text_sx_gt(text,text) RETURNS bool AS
+'select text_soundex($1) > text_soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_le(text,text) RETURNS bool AS
+'select text_soundex($1) <= text_soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_ge(text,text) RETURNS bool AS
+'select text_soundex($1) >= text_soundex($2)'
+LANGUAGE 'sql';
+
+CREATE FUNCTION text_sx_ne(text,text) RETURNS bool AS
+'select text_soundex($1) <> text_soundex($2)'
+LANGUAGE 'sql';
+
+DROP OPERATOR #= (text,text)\g
+
+CREATE OPERATOR #= (leftarg=text, rightarg=text, procedure=text_sx_eq,
+commutator=text_sx_eq)\g
+
+SELECT *
+FROM s
+WHERE text_sx_eq(nm,'john')\g
+
+SELECT *
+from s
+where s.nm #= 'john';
+