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116 lines
3.3 KiB
C
116 lines
3.3 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP Version 5 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2004 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.0 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_0.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Bjørn Borud - Guardian Networks AS <borud@guardian.no> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include "php.h"
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#include <stdlib.h>
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#include <errno.h>
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#include <ctype.h>
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#include "php_string.h"
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/* Simple soundex algorithm as described by Knuth in TAOCP, vol 3 */
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/* {{{ proto string soundex(string str)
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Calculate the soundex key of a string */
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PHP_FUNCTION(soundex)
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{
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char *str;
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int i, _small, str_len, code, last;
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char soundex[4 + 1];
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static char soundex_table[26] =
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{0, /* A */
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'1', /* B */
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'2', /* C */
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'3', /* D */
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0, /* E */
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'1', /* F */
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'2', /* G */
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0, /* H */
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0, /* I */
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'2', /* J */
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'2', /* K */
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'4', /* L */
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'5', /* M */
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'5', /* N */
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0, /* O */
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'1', /* P */
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'2', /* Q */
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'6', /* R */
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'2', /* S */
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'3', /* T */
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0, /* U */
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'1', /* V */
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0, /* W */
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'2', /* X */
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0, /* Y */
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'2'}; /* Z */
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if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
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return;
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}
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if (str_len == 0) {
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RETURN_FALSE;
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}
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/* build soundex string */
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last = -1;
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for (i = 0, _small = 0; i < str_len && _small < 4; i++) {
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/* convert chars to upper case and strip non-letter chars */
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/* BUG: should also map here accented letters used in non */
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/* English words or names (also found in English text!): */
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/* esstsett, thorn, n-tilde, c-cedilla, s-caron, ... */
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code = toupper(str[i]);
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if (code >= 'A' && code <= 'Z') {
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if (_small == 0) {
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/* remember first valid char */
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soundex[_small++] = code;
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last = soundex_table[code - 'A'];
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}
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else {
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/* ignore sequences of consonants with same soundex */
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/* code in trail, and vowels unless they separate */
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/* consonant letters */
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code = soundex_table[code - 'A'];
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if (code != last) {
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if (code != 0) {
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soundex[_small++] = code;
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}
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last = code;
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}
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}
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}
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}
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/* pad with '0' and terminate with 0 ;-) */
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while (_small < 4) {
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soundex[_small++] = '0';
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}
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soundex[_small] = '\0';
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RETURN_STRINGL(soundex, _small, 1);
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}
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/* }}} */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: sw=4 ts=4 fdm=marker
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* vim<600: sw=4 ts=4
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*/
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