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Defend against non-ASCII letters in fuzzystrmatch code. The functions

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still don't behave very sanely for multibyte encodings, but at least
they won't be indexing off the ends of static arrays.
This commit is contained in:
Tom Lane 2009-04-07 15:54:07 +00:00
parent 4bc176deae
commit 6a42ab4eb8
1 changed files with 28 additions and 10 deletions
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38
contrib/fuzzystrmatch/fuzzystrmatch.h
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@ -5,7 +5,7 @@
*
* Joe Conway <mail@joeconway.com>
*
* $PostgreSQL: pgsql/contrib/fuzzystrmatch/fuzzystrmatch.h,v 1.14 2006/07/10 18:40:16 momjian Exp $
* $PostgreSQL: pgsql/contrib/fuzzystrmatch/fuzzystrmatch.h,v 1.14.2.1 2009/04/07 15:54:07 tgl Exp $
* Copyright (c) 2001-2006, PostgreSQL Global Development Group
* ALL RIGHTS RESERVED;
*
@ -75,7 +75,15 @@ static void _soundex(const char *instr, char *outstr);
/* ABCDEFGHIJKLMNOPQRSTUVWXYZ */
static const char *soundex_table = "01230120022455012623010202";
#define soundex_code(letter) soundex_table[toupper((unsigned char) (letter)) - 'A']
static char
soundex_code(char letter)
{
letter = toupper((unsigned char) letter);
/* Defend against non-ASCII letters */
if (letter >= 'A' && letter <= 'Z')
return soundex_table[letter - 'A'];
return letter;
}
/*
@ -148,26 +156,36 @@ _metaphone(
/*-- Character encoding array & accessing macros --*/
/* Stolen directly out of the book... */
char _codes[26] = {
static const char _codes[26] = {
1, 16, 4, 16, 9, 2, 4, 16, 9, 2, 0, 2, 2, 2, 1, 4, 0, 2, 4, 4, 1, 0, 0, 0, 8, 0
/* a b c d e f g h i j k l m n o p q r s t u v w x y z */
};
static int
getcode(char c)
{
if (isalpha((unsigned char) c))
{
c = toupper((unsigned char) c);
/* Defend against non-ASCII letters */
if (c >= 'A' && c <= 'Z')
return _codes[c - 'A'];
}
return 0;
}
#define ENCODE(c) (isalpha((unsigned char) (c)) ? _codes[((toupper((unsigned char) (c))) - 'A')] : 0)
#define isvowel(c) (ENCODE(c) & 1) /* AEIOU */
#define isvowel(c) (getcode(c) & 1) /* AEIOU */
/* These letters are passed through unchanged */
#define NOCHANGE(c) (ENCODE(c) & 2) /* FJMNR */
#define NOCHANGE(c) (getcode(c) & 2) /* FJMNR */
/* These form dipthongs when preceding H */
#define AFFECTH(c) (ENCODE(c) & 4) /* CGPST */
#define AFFECTH(c) (getcode(c) & 4) /* CGPST */
/* These make C and G soft */
#define MAKESOFT(c) (ENCODE(c) & 8) /* EIY */
#define MAKESOFT(c) (getcode(c) & 8) /* EIY */
/* These prevent GH from becoming F */
#define NOGHTOF(c) (ENCODE(c) & 16) /* BDH */
#define NOGHTOF(c) (getcode(c) & 16) /* BDH */
#endif /* FUZZYSTRMATCH_H */