Annotation of embedaddon/php/ext/standard/soundex.c, revision 1.1
1.1 ! misho 1: /*
! 2: +----------------------------------------------------------------------+
! 3: | PHP Version 5 |
! 4: +----------------------------------------------------------------------+
! 5: | Copyright (c) 1997-2012 The PHP Group |
! 6: +----------------------------------------------------------------------+
! 7: | This source file is subject to version 3.01 of the PHP license, |
! 8: | that is bundled with this package in the file LICENSE, and is |
! 9: | available through the world-wide-web at the following url: |
! 10: | http://www.php.net/license/3_01.txt |
! 11: | If you did not receive a copy of the PHP license and are unable to |
! 12: | obtain it through the world-wide-web, please send a note to |
! 13: | license@php.net so we can mail you a copy immediately. |
! 14: +----------------------------------------------------------------------+
! 15: | Author: Bjørn Borud - Guardian Networks AS <borud@guardian.no> |
! 16: +----------------------------------------------------------------------+
! 17: */
! 18: /* $Id: soundex.c 321634 2012-01-01 13:15:04Z felipe $ */
! 19:
! 20: #include "php.h"
! 21: #include <stdlib.h>
! 22: #include <errno.h>
! 23: #include <ctype.h>
! 24: #include "php_string.h"
! 25:
! 26: /* Simple soundex algorithm as described by Knuth in TAOCP, vol 3 */
! 27: /* {{{ proto string soundex(string str)
! 28: Calculate the soundex key of a string */
! 29: PHP_FUNCTION(soundex)
! 30: {
! 31: char *str;
! 32: int i, _small, str_len, code, last;
! 33: char soundex[4 + 1];
! 34:
! 35: static char soundex_table[26] =
! 36: {0, /* A */
! 37: '1', /* B */
! 38: '2', /* C */
! 39: '3', /* D */
! 40: 0, /* E */
! 41: '1', /* F */
! 42: '2', /* G */
! 43: 0, /* H */
! 44: 0, /* I */
! 45: '2', /* J */
! 46: '2', /* K */
! 47: '4', /* L */
! 48: '5', /* M */
! 49: '5', /* N */
! 50: 0, /* O */
! 51: '1', /* P */
! 52: '2', /* Q */
! 53: '6', /* R */
! 54: '2', /* S */
! 55: '3', /* T */
! 56: 0, /* U */
! 57: '1', /* V */
! 58: 0, /* W */
! 59: '2', /* X */
! 60: 0, /* Y */
! 61: '2'}; /* Z */
! 62:
! 63: if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
! 64: return;
! 65: }
! 66: if (str_len == 0) {
! 67: RETURN_FALSE;
! 68: }
! 69:
! 70: /* build soundex string */
! 71: last = -1;
! 72: for (i = 0, _small = 0; i < str_len && _small < 4; i++) {
! 73: /* convert chars to upper case and strip non-letter chars */
! 74: /* BUG: should also map here accented letters used in non */
! 75: /* English words or names (also found in English text!): */
! 76: /* esstsett, thorn, n-tilde, c-cedilla, s-caron, ... */
! 77: code = toupper((int)(unsigned char)str[i]);
! 78: if (code >= 'A' && code <= 'Z') {
! 79: if (_small == 0) {
! 80: /* remember first valid char */
! 81: soundex[_small++] = code;
! 82: last = soundex_table[code - 'A'];
! 83: }
! 84: else {
! 85: /* ignore sequences of consonants with same soundex */
! 86: /* code in trail, and vowels unless they separate */
! 87: /* consonant letters */
! 88: code = soundex_table[code - 'A'];
! 89: if (code != last) {
! 90: if (code != 0) {
! 91: soundex[_small++] = code;
! 92: }
! 93: last = code;
! 94: }
! 95: }
! 96: }
! 97: }
! 98: /* pad with '0' and terminate with 0 ;-) */
! 99: while (_small < 4) {
! 100: soundex[_small++] = '0';
! 101: }
! 102: soundex[_small] = '\0';
! 103:
! 104: RETURN_STRINGL(soundex, _small, 1);
! 105: }
! 106: /* }}} */
! 107:
! 108: /*
! 109: * Local variables:
! 110: * tab-width: 4
! 111: * c-basic-offset: 4
! 112: * End:
! 113: * vim600: sw=4 ts=4 fdm=marker
! 114: * vim<600: sw=4 ts=4
! 115: */
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