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MATCH.C
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1991-09-27
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/*--------------------------------------------------------------------------
match.c
The match() routine recursively compares a string to a "pattern" (regular
expression), returning TRUE if a match is found or FALSE if not. This
version is specifically for use with unzip.c: it leaves the case (upper,
lower, or mixed) of the string alone, but converts any uppercase characters
in the pattern to lowercase if indicated by the global variable lcflag
(which is to say, string is assumed to have been converted to lowercase
already, if such was necessary).
--------------------------------------------------------------------------
Revision history:
Original Author: Thom Henderson
Original System V port: Mike Stump
03/22/87 C. Seaman enhancements, bug fixes, cleanup
11/13/89 C. Mascott adapted for use with unzip
01/25/90 J. Cowan made case-insensitive (only for smart toupper())
03/17/90 D. Kirschbaum prototypes, other tweaks for Turbo C
05/18/90 M. O'Carroll DOS and OS/2 family version
09/20/90 G. Roelofs modified for lcflag, moved stuff to header file
--------------------------------------------------------------------------
Copyright, originally from arcmatch.c, version 1.1 (?):
* ARC - Archive utility - ARCMATCH
*
* Version 2.17, created on 12/17/85) at 20:32:18
*
* (C) COPYRIGHT 1985 by System Enhancement Associates; ALL RIGHTS RESERVED
--------------------------------------------------------------------------*/
#include "unzip.h"
/*******************/
/* Match Defines */
/*******************/
#define ASTERISK '*' /* The '*' metacharacter */
#define QUESTION '?' /* The '?' metacharacter */
#define BACK_SLASH '\\' /* The '\' metacharacter */
#define LEFT_BRACKET '[' /* The '[' metacharacter */
#define RIGHT_BRACKET ']' /* The ']' metacharacter */
#define EOS '\000' /* end-of-string */
#define IS_OCTAL(ch) (ch >= '0' && ch <= '7')
/********************/
/* Match Typedefs */
/********************/
typedef short int INT;
typedef short int BOOLEAN;
/*************************************/
/* Match Local Function Prototypes */
/*************************************/
static BOOLEAN do_list __((register char *string, char *pattern));
static void list_parse __((char **patp, char *lowp, char *highp));
static char nextch __((char **patp));
/**********************/
/* Function match() */
/**********************/
int match(string, pattern)
char *string;
char *pattern;
{
register int ismatch;
ismatch = FALSE;
switch (*pattern) {
case ASTERISK:
pattern++;
do {
ismatch = match(string, pattern);
}
while (!ismatch && *string++ != EOS);
break;
case QUESTION:
if (*string != EOS)
ismatch = match(++string, ++pattern);
break;
case EOS:
if (*string == EOS)
ismatch = TRUE;
break;
case LEFT_BRACKET:
if (*string != EOS)
ismatch = do_list(string, pattern);
break;
case BACK_SLASH:
pattern++;
default:
#ifdef OS2
if (tolower(*string) == tolower(*pattern)) {
#else
if (*string == ((lcflag && isupper(*pattern)) ? tolower(*pattern) : *pattern)) {
#endif
string++;
pattern++;
ismatch = match(string, pattern);
} else
ismatch = FALSE;
break;
}
return (ismatch);
}
/************************/
/* Function do_list() */
/************************/
static BOOLEAN do_list(string, pattern)
register char *string;
char *pattern;
{
register BOOLEAN ismatch;
register BOOLEAN if_found;
register BOOLEAN if_not_found;
auto char lower;
auto char upper;
pattern++;
if (*pattern == '!') {
if_found = FALSE;
if_not_found = TRUE;
pattern++;
} else {
if_found = TRUE;
if_not_found = FALSE;
}
ismatch = if_not_found;
while (*pattern != ']' && *pattern != EOS) {
list_parse(&pattern, &lower, &upper);
#ifdef OS2
if (tolower(*string) >= tolower(lower) &&
tolower(*string) <= tolower(upper)) {
#else
if (*string >= lower && *string <= upper) {
#endif
ismatch = if_found;
while (*pattern != ']' && *pattern != EOS)
pattern++;
}
}
if (*pattern++ != ']') {
printf("Character class error\n");
#ifdef MSWIN
return(FALSE);
#else
exit(1);
#endif
} else if (ismatch)
ismatch = match(++string, pattern);
return (ismatch);
}
/***************************/
/* Function list_parse() */
/***************************/
static void list_parse(patp, lowp, highp)
char **patp;
char *lowp;
char *highp;
{
*lowp = nextch(patp);
if (**patp == '-') {
(*patp)++;
*highp = nextch(patp);
} else
*highp = *lowp;
}
/***********************/
/* Function nextch() */
/***********************/
static char nextch(patp)
char **patp;
{
register char ch;
register char chsum;
register INT count;
ch = *(*patp)++;
if (ch == '\\') {
ch = *(*patp)++;
if (IS_OCTAL(ch)) {
chsum = 0;
for (count = 0; count < 3 && IS_OCTAL(ch); count++) {
chsum *= 8;
chsum += ch - '0';
ch = *(*patp)++;
}
(*patp)--;
ch = chsum;
}
}
return (ch);
}