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|
/*
+----------------------------------------------------------------------+
| PHP version 4.0 |
+----------------------------------------------------------------------+
| Copyright (c) 1997, 1998, 1999 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_0.txt. |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Bjørn Borud - Guardian Networks AS <borud@guardian.no> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "php.h"
#include <stdlib.h>
#include <errno.h>
#include <ctype.h>
#include "php_string.h"
/* Simple soundex algorithm as described by Knuth in TAOCP, vol 3 */
/* {{{ proto string soundex(string str)
Calculate the soundex key of a string */
PHP_FUNCTION(soundex)
{
char *somestring;
int i, _small, len, code, last;
pval *arg, **parg;
char soundex[4 + 1];
static char soundex_table[26] =
{0, /* A */
'1', /* B */
'2', /* C */
'3', /* D */
0, /* E */
'1', /* F */
'2', /* G */
0, /* H */
0, /* I */
'2', /* J */
'2', /* K */
'4', /* L */
'5', /* M */
'5', /* N */
0, /* O */
'1', /* P */
'2', /* Q */
'6', /* R */
'2', /* S */
'3', /* T */
0, /* U */
'1', /* V */
0, /* W */
'2', /* X */
0, /* Y */
'2'}; /* Z */
if (ARG_COUNT(ht) != 1 || getParametersEx(1, &parg) == FAILURE) {
WRONG_PARAM_COUNT;
}
convert_to_string_ex(parg);
arg = *parg;
if (arg->value.str.len==0) {
RETURN_FALSE;
}
somestring = arg->value.str.val;
len = arg->value.str.len;
/* build soundex string */
last = -1;
for (i = 0, _small = 0; i < len && _small < 4; i++) {
/* convert chars to upper case and strip non-letter chars */
/* BUG: should also map here accented letters used in non */
/* English words or names (also found in English text!): */
/* esstsett, thorn, n-tilde, c-cedilla, s-caron, ... */
code = toupper(somestring[i]);
if (code >= 'A' && code <= 'Z') {
if (_small == 0) {
/* remember first valid char */
soundex[_small++] = code;
last = soundex_table[code - 'A'];
}
else {
/* ignore sequences of consonants with same soundex */
/* code in trail, and vowels unless they separate */
/* consonant letters */
code = soundex_table[code - 'A'];
if (code != last) {
if (code != 0) {
soundex[_small++] = code;
}
last = code;
}
}
}
}
/* pad with '0' and terminate with 0 ;-) */
while (_small < 4) {
soundex[_small++] = '0';
}
soundex[_small] = '\0';
return_value->value.str.val = estrndup(soundex, _small);
return_value->value.str.len = _small;
return_value->type = IS_STRING;
}
/* }}} */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
|
