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9f78b05443
curl/lib/curl_fnmatch.c
Daniel Stenberg 6e6bf60357
fnmatch: remove dead code 
There was a duplicate check for backslashes in the setcharset()
function.

Coverity CID 1420611
2017-11-06 09:01:53 +01:00

422 lines
11 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#include "curl_fnmatch.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
#define CURLFNM_CHARSET_LEN (sizeof(char) * 256)
#define CURLFNM_CHSET_SIZE (CURLFNM_CHARSET_LEN + 15)
#define CURLFNM_NEGATE CURLFNM_CHARSET_LEN
#define CURLFNM_ALNUM (CURLFNM_CHARSET_LEN + 1)
#define CURLFNM_DIGIT (CURLFNM_CHARSET_LEN + 2)
#define CURLFNM_XDIGIT (CURLFNM_CHARSET_LEN + 3)
#define CURLFNM_ALPHA (CURLFNM_CHARSET_LEN + 4)
#define CURLFNM_PRINT (CURLFNM_CHARSET_LEN + 5)
#define CURLFNM_BLANK (CURLFNM_CHARSET_LEN + 6)
#define CURLFNM_LOWER (CURLFNM_CHARSET_LEN + 7)
#define CURLFNM_GRAPH (CURLFNM_CHARSET_LEN + 8)
#define CURLFNM_SPACE (CURLFNM_CHARSET_LEN + 9)
#define CURLFNM_UPPER (CURLFNM_CHARSET_LEN + 10)
typedef enum {
CURLFNM_LOOP_DEFAULT = 0,
CURLFNM_LOOP_BACKSLASH
} loop_state;
typedef enum {
CURLFNM_SCHS_DEFAULT = 0,
CURLFNM_SCHS_MAYRANGE,
CURLFNM_SCHS_MAYRANGE2,
CURLFNM_SCHS_RIGHTBR,
CURLFNM_SCHS_RIGHTBRLEFTBR
} setcharset_state;
typedef enum {
CURLFNM_PKW_INIT = 0,
CURLFNM_PKW_DDOT
} parsekey_state;
#define SETCHARSET_OK 1
#define SETCHARSET_FAIL 0
static int parsekeyword(unsigned char **pattern, unsigned char *charset)
{
parsekey_state state = CURLFNM_PKW_INIT;
#define KEYLEN 10
char keyword[KEYLEN] = { 0 };
int found = FALSE;
int i;
unsigned char *p = *pattern;
for(i = 0; !found; i++) {
char c = *p++;
if(i >= KEYLEN)
return SETCHARSET_FAIL;
switch(state) {
case CURLFNM_PKW_INIT:
if(ISALPHA(c) && ISLOWER(c))
keyword[i] = c;
else if(c == ':')
state = CURLFNM_PKW_DDOT;
else
return 0;
break;
case CURLFNM_PKW_DDOT:
if(c == ']')
found = TRUE;
else
return SETCHARSET_FAIL;
}
}
#undef KEYLEN
*pattern = p; /* move caller's pattern pointer */
if(strcmp(keyword, "digit") == 0)
charset[CURLFNM_DIGIT] = 1;
else if(strcmp(keyword, "alnum") == 0)
charset[CURLFNM_ALNUM] = 1;
else if(strcmp(keyword, "alpha") == 0)
charset[CURLFNM_ALPHA] = 1;
else if(strcmp(keyword, "xdigit") == 0)
charset[CURLFNM_XDIGIT] = 1;
else if(strcmp(keyword, "print") == 0)
charset[CURLFNM_PRINT] = 1;
else if(strcmp(keyword, "graph") == 0)
charset[CURLFNM_GRAPH] = 1;
else if(strcmp(keyword, "space") == 0)
charset[CURLFNM_SPACE] = 1;
else if(strcmp(keyword, "blank") == 0)
charset[CURLFNM_BLANK] = 1;
else if(strcmp(keyword, "upper") == 0)
charset[CURLFNM_UPPER] = 1;
else if(strcmp(keyword, "lower") == 0)
charset[CURLFNM_LOWER] = 1;
else
return SETCHARSET_FAIL;
return SETCHARSET_OK;
}
/* returns 1 (true) if pattern is OK, 0 if is bad ("p" is pattern pointer) */
static int setcharset(unsigned char **p, unsigned char *charset)
{
setcharset_state state = CURLFNM_SCHS_DEFAULT;
unsigned char rangestart = 0;
unsigned char lastchar = 0;
bool something_found = FALSE;
unsigned char c;
for(;;) {
c = **p;
switch(state) {
case CURLFNM_SCHS_DEFAULT:
if(ISALNUM(c)) { /* ASCII value */
rangestart = c;
charset[c] = 1;
(*p)++;
state = CURLFNM_SCHS_MAYRANGE;
something_found = TRUE;
}
else if(c == ']') {
if(something_found)
return SETCHARSET_OK;
something_found = TRUE;
state = CURLFNM_SCHS_RIGHTBR;
charset[c] = 1;
(*p)++;
}
else if(c == '[') {
char c2 = *((*p) + 1);
if(c2 == ':') { /* there has to be a keyword */
(*p) += 2;
if(parsekeyword(p, charset)) {
state = CURLFNM_SCHS_DEFAULT;
}
else
return SETCHARSET_FAIL;
}
else {
charset[c] = 1;
(*p)++;
}
something_found = TRUE;
}
else if(c == '?' || c == '*') {
something_found = TRUE;
charset[c] = 1;
(*p)++;
}
else if(c == '^' || c == '!') {
if(!something_found) {
if(charset[CURLFNM_NEGATE]) {
charset[c] = 1;
something_found = TRUE;
}
else
charset[CURLFNM_NEGATE] = 1; /* negate charset */
}
else
charset[c] = 1;
(*p)++;
}
else if(c == '\\') {
c = *(++(*p));
if(ISPRINT((c))) {
something_found = TRUE;
state = CURLFNM_SCHS_MAYRANGE;
charset[c] = 1;
rangestart = c;
(*p)++;
}
else
return SETCHARSET_FAIL;
}
else if(c == '\0') {
return SETCHARSET_FAIL;
}
else {
charset[c] = 1;
(*p)++;
something_found = TRUE;
}
break;
case CURLFNM_SCHS_MAYRANGE:
if(c == '-') {
charset[c] = 1;
(*p)++;
lastchar = '-';
state = CURLFNM_SCHS_MAYRANGE2;
}
else if(c == '[') {
state = CURLFNM_SCHS_DEFAULT;
}
else if(ISALNUM(c)) {
charset[c] = 1;
(*p)++;
}
else if(c == '\\') {
c = *(++(*p));
if(ISPRINT(c)) {
charset[c] = 1;
(*p)++;
}
else
return SETCHARSET_FAIL;
}
else if(c == ']') {
return SETCHARSET_OK;
}
else
return SETCHARSET_FAIL;
break;
case CURLFNM_SCHS_MAYRANGE2:
if(c == ']') {
return SETCHARSET_OK;
}
else if(c == '\\') {
c = *(++(*p));
if(ISPRINT(c)) {
charset[c] = 1;
state = CURLFNM_SCHS_DEFAULT;
(*p)++;
}
else
return SETCHARSET_FAIL;
}
else if(c >= rangestart) {
if((ISLOWER(c) && ISLOWER(rangestart)) ||
(ISDIGIT(c) && ISDIGIT(rangestart)) ||
(ISUPPER(c) && ISUPPER(rangestart))) {
charset[lastchar] = 0;
rangestart++;
while(rangestart++ <= c)
charset[rangestart-1] = 1;
(*p)++;
state = CURLFNM_SCHS_DEFAULT;
}
else
return SETCHARSET_FAIL;
}
else
return SETCHARSET_FAIL;
break;
case CURLFNM_SCHS_RIGHTBR:
if(c == '[') {
state = CURLFNM_SCHS_RIGHTBRLEFTBR;
charset[c] = 1;
(*p)++;
}
else if(c == ']') {
return SETCHARSET_OK;
}
else if(c == '\0') {
return SETCHARSET_FAIL;
}
else if(ISPRINT(c)) {
charset[c] = 1;
(*p)++;
state = CURLFNM_SCHS_DEFAULT;
}
else
/* used 'goto fail' instead of 'return SETCHARSET_FAIL' to avoid a
* nonsense warning 'statement not reached' at end of the fnc when
* compiling on Solaris */
goto fail;
break;
case CURLFNM_SCHS_RIGHTBRLEFTBR:
if(c == ']') {
return SETCHARSET_OK;
}
else {
state = CURLFNM_SCHS_DEFAULT;
charset[c] = 1;
(*p)++;
}
break;
}
}
fail:
return SETCHARSET_FAIL;
}
static int loop(const unsigned char *pattern, const unsigned char *string)
{
loop_state state = CURLFNM_LOOP_DEFAULT;
unsigned char *p = (unsigned char *)pattern;
unsigned char *s = (unsigned char *)string;
unsigned char charset[CURLFNM_CHSET_SIZE] = { 0 };
int rc = 0;
for(;;) {
switch(state) {
case CURLFNM_LOOP_DEFAULT:
if(*p == '*') {
while(*(p + 1) == '*') /* eliminate multiple stars */
p++;
if(*s == '\0' && *(p + 1) == '\0')
return CURL_FNMATCH_MATCH;
rc = loop(p + 1, s); /* *.txt matches .txt <=> .txt matches .txt */
if(rc == CURL_FNMATCH_MATCH)
return CURL_FNMATCH_MATCH;
if(*s) /* let the star eat up one character */
s++;
else
return CURL_FNMATCH_NOMATCH;
}
else if(*p == '?') {
if(ISPRINT(*s)) {
s++;
p++;
}
else if(*s == '\0')
return CURL_FNMATCH_NOMATCH;
else
return CURL_FNMATCH_FAIL; /* cannot deal with other character */
}
else if(*p == '\0') {
if(*s == '\0')
return CURL_FNMATCH_MATCH;
return CURL_FNMATCH_NOMATCH;
}
else if(*p == '\\') {
state = CURLFNM_LOOP_BACKSLASH;
p++;
}
else if(*p == '[') {
unsigned char *pp = p + 1; /* cannot handle with pointer to register */
if(setcharset(&pp, charset)) {
int found = FALSE;
if(charset[(unsigned int)*s])
found = TRUE;
else if(charset[CURLFNM_ALNUM])
found = ISALNUM(*s);
else if(charset[CURLFNM_ALPHA])
found = ISALPHA(*s);
else if(charset[CURLFNM_DIGIT])
found = ISDIGIT(*s);
else if(charset[CURLFNM_XDIGIT])
found = ISXDIGIT(*s);
else if(charset[CURLFNM_PRINT])
found = ISPRINT(*s);
else if(charset[CURLFNM_SPACE])
found = ISSPACE(*s);
else if(charset[CURLFNM_UPPER])
found = ISUPPER(*s);
else if(charset[CURLFNM_LOWER])
found = ISLOWER(*s);
else if(charset[CURLFNM_BLANK])
found = ISBLANK(*s);
else if(charset[CURLFNM_GRAPH])
found = ISGRAPH(*s);
if(charset[CURLFNM_NEGATE])
found = !found;
if(found) {
p = pp + 1;
s++;
memset(charset, 0, CURLFNM_CHSET_SIZE);
}
else
return CURL_FNMATCH_NOMATCH;
}
else
return CURL_FNMATCH_FAIL;
}
else {
if(*p++ != *s++)
return CURL_FNMATCH_NOMATCH;
}
break;
case CURLFNM_LOOP_BACKSLASH:
if(ISPRINT(*p)) {
if(*p++ == *s++)
state = CURLFNM_LOOP_DEFAULT;
else
return CURL_FNMATCH_NOMATCH;
}
else
return CURL_FNMATCH_FAIL;
break;
}
}
}
/*
* @unittest: 1307
*/
int Curl_fnmatch(void *ptr, const char *pattern, const char *string)
{
(void)ptr; /* the argument is specified by the curl_fnmatch_callback
prototype, but not used by Curl_fnmatch() */
if(!pattern || !string) {
return CURL_FNMATCH_FAIL;
}
return loop((unsigned char *)pattern, (unsigned char *)string);
}
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