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126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP version 4.0 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997, 1998, 1999 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.0 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 at through the world-wide-web at |
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| http://www.php.net/license/2_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 "php3_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 l, u;
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char *somestring;
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int i, j, n;
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pval *arg;
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/* pad with '0' and terminate with 0 ;-) */
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char soundex[5] =
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{'0', '0', '0', '0', 0};
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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 (ARG_COUNT(ht) != 1 || getParameters(ht, 1, &arg) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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convert_to_string(arg);
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if (arg->value.str.len==0) {
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RETURN_FALSE;
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}
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somestring = arg->value.str.val;
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n = arg->value.str.len;
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/* convert chars to upper case and strip non-letter chars */
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j = 0;
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for (i = 0; i < n; i++) {
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u = toupper(somestring[i]);
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if ((u > 64) && (u < 91)) {
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somestring[j] = u;
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j++;
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}
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}
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/* null-terminate string */
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somestring[j] = 0;
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n = strlen(somestring);
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/* prefix soundex string with first valid char */
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soundex[0] = somestring[0];
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/* remember first char */
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l = soundex_table[((somestring[0]) - 65)];
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j = 1;
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/* build soundex string */
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for (i = 1; i < n && j < 4; i++) {
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u = soundex_table[((somestring[i]) - 65)];
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if (u != l) {
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if (u != 0) {
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soundex[(int) j++] = u;
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}
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l = u;
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}
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}
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return_value->value.str.val = estrndup(soundex, 4);
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return_value->value.str.len = strlen(soundex);
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return_value->type = IS_STRING;
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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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*/
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