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curl/src/urlglob.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2005, 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 http://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.
*
* $Id$
***************************************************************************/
/* client-local setup.h */
#include "setup.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <curl/curl.h>
#define _MPRINTF_REPLACE /* we want curl-functions instead of native ones */
#include <curl/mprintf.h>
#include "urlglob.h"
#if defined(CURLDEBUG) && defined(CURLTOOLDEBUG)
#include "memdebug.h"
#endif
typedef enum {
GLOB_OK,
GLOB_ERROR
} GlobCode;
/*
* glob_word()
*
* Input a full globbed string, set the forth argument to the amount of
* strings we get out of this. Return GlobCode.
*/
static GlobCode glob_word(URLGlob *, /* object anchor */
char *, /* globbed string */
size_t, /* position */
int *); /* returned number of strings */
static GlobCode glob_set(URLGlob *glob, char *pattern,
size_t pos, int *amount)
{
/* processes a set expression with the point behind the opening '{'
','-separated elements are collected until the next closing '}'
*/
char* buf = glob->glob_buffer;
URLPattern *pat;
pat = (URLPattern*)&glob->pattern[glob->size / 2];
/* patterns 0,1,2,... correspond to size=1,3,5,... */
pat->type = UPTSet;
pat->content.Set.size = 0;
pat->content.Set.ptr_s = 0;
pat->content.Set.elements = (char**)malloc(0);
++glob->size;
while (1) {
bool skip;
switch (*pattern) {
case '\0': /* URL ended while set was still open */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"unmatched brace at pos %d\n", (int)pos);
return GLOB_ERROR;
case '{':
case '[': /* no nested expressions at this time */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"nested braces not supported at pos %d\n", (int)pos);
return GLOB_ERROR;
case ',':
case '}': /* set element completed */
*buf = '\0';
pat->content.Set.elements =
realloc(pat->content.Set.elements,
(pat->content.Set.size + 1) * sizeof(char*));
if (!pat->content.Set.elements) {
snprintf(glob->errormsg, sizeof(glob->errormsg), "out of memory");
return GLOB_ERROR;
}
pat->content.Set.elements[pat->content.Set.size] =
strdup(glob->glob_buffer);
++pat->content.Set.size;
if (*pattern == '}') {
/* entire set pattern completed */
int wordamount;
/* always check for a literal (may be "") between patterns */
if(GLOB_ERROR == glob_word(glob, ++pattern, ++pos, &wordamount))
wordamount=1;
*amount = pat->content.Set.size * wordamount;
return GLOB_OK;
}
buf = glob->glob_buffer;
++pattern;
++pos;
break;
case ']': /* illegal closing bracket */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"illegal pattern at pos %d\n", (int)pos);
return GLOB_ERROR;
case '\\': /* escaped character, skip '\' */
switch(pattern[1]) {
case '[':
case ']':
case '{':
case '}':
case ',':
skip = TRUE;
break;
default:
skip = FALSE;
break;
}
if(skip) {
if (*(buf+1) == '\0') { /* but no escaping of '\0'! */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"illegal pattern at pos %d\n", (int)pos);
return GLOB_ERROR;
}
++pattern;
++pos;
}
/* intentional fallthrough */
default:
*buf++ = *pattern++; /* copy character to set element */
++pos;
}
}
/* we never reach this point */
}
static GlobCode glob_range(URLGlob *glob, char *pattern,
size_t pos, int *amount)
{
/* processes a range expression with the point behind the opening '['
- char range: e.g. "a-z]", "B-Q]"
- num range: e.g. "0-9]", "17-2000]"
- num range with leading zeros: e.g. "001-999]"
expression is checked for well-formedness and collected until the next ']'
*/
URLPattern *pat;
char *c;
int wordamount=1;
char sep;
char sep2;
int step;
int rc;
pat = (URLPattern*)&glob->pattern[glob->size / 2];
/* patterns 0,1,2,... correspond to size=1,3,5,... */
++glob->size;
if (isalpha((int)*pattern)) { /* character range detected */
char min_c;
char max_c;
pat->type = UPTCharRange;
rc = sscanf(pattern, "%c-%c%c%d%c", &min_c, &max_c, &sep, &step, &sep2);
if ((rc < 3) || (min_c >= max_c) || ((max_c - min_c) > ('z' - 'a'))) {
/* the pattern is not well-formed */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"errpr: bad range specification after pos %d\n", pos);
return GLOB_ERROR;
}
/* check the (first) separating character */
if((sep != ']') && (sep != ':')) {
snprintf(glob->errormsg, sizeof(glob->errormsg),
"error: unsupported character (%c) after range at pos %d\n",
sep, pos);
return GLOB_ERROR;
}
/* if there was a ":[num]" thing, use that as step or else use 1 */
pat->content.CharRange.step =
((sep == ':') && (rc == 5) && (sep2 == ']'))?step:1;
pat->content.CharRange.ptr_c = pat->content.CharRange.min_c = min_c;
pat->content.CharRange.max_c = max_c;
}
else if (isdigit((int)*pattern)) { /* numeric range detected */
int min_n;
int max_n;
pat->type = UPTNumRange;
pat->content.NumRange.padlength = 0;
rc = sscanf(pattern, "%d-%d%c%d%c", &min_n, &max_n, &sep, &step, &sep2);
if ((rc < 2) || (min_n >= max_n)) {
/* the pattern is not well-formed */
snprintf(glob->errormsg, sizeof(glob->errormsg),
"error: bad range specification after pos %d\n", pos);
return GLOB_ERROR;
}
pat->content.NumRange.ptr_n = pat->content.NumRange.min_n = min_n;
pat->content.NumRange.max_n = max_n;
/* if there was a ":[num]" thing, use that as step or else use 1 */
pat->content.NumRange.step =
((sep == ':') && (rc == 5) && (sep2 == ']'))?step:1;
if (*pattern == '0') { /* leading zero specified */
c = pattern;
while (isdigit((int)*c++))
++pat->content.NumRange.padlength; /* padding length is set for all
instances of this pattern */
}
}
else {
snprintf(glob->errormsg, sizeof(glob->errormsg),
"illegal character in range specification at pos %d\n", pos);
return GLOB_ERROR;
}
c = (char*)strchr(pattern, ']'); /* continue after next ']' */
if(c)
c++;
else {
snprintf(glob->errormsg, sizeof(glob->errormsg), "missing ']'");
return GLOB_ERROR; /* missing ']' */
}
/* always check for a literal (may be "") between patterns */
if(GLOB_ERROR == glob_word(glob, c, pos + (c - pattern), &wordamount))
wordamount = 1;
if(pat->type == UPTCharRange)
*amount = (pat->content.CharRange.max_c -
pat->content.CharRange.min_c + 1) *
wordamount;
else
*amount = (pat->content.NumRange.max_n -
pat->content.NumRange.min_n + 1) * wordamount;
return GLOB_OK;
}
static GlobCode glob_word(URLGlob *glob, char *pattern,
size_t pos, int *amount)
{
/* processes a literal string component of a URL
special characters '{' and '[' branch to set/range processing functions
*/
char* buf = glob->glob_buffer;
size_t litindex;
GlobCode res = GLOB_OK;
*amount = 1; /* default is one single string */
while (*pattern != '\0' && *pattern != '{' && *pattern != '[') {
if (*pattern == '}' || *pattern == ']')
return GLOB_ERROR;
/* only allow \ to escape known "special letters" */
if (*pattern == '\\' &&
(*(pattern+1) == '{' || *(pattern+1) == '[' ||
*(pattern+1) == '}' || *(pattern+1) == ']') ) {
/* escape character, skip '\' */
++pattern;
++pos;
if (*pattern == '\0') /* but no escaping of '\0'! */
return GLOB_ERROR;
}
*buf++ = *pattern++; /* copy character to literal */
++pos;
}
*buf = '\0';
litindex = glob->size / 2;
/* literals 0,1,2,... correspond to size=0,2,4,... */
glob->literal[litindex] = strdup(glob->glob_buffer);
if(!glob->literal[litindex])
return GLOB_ERROR;
++glob->size;
switch (*pattern) {
case '\0':
break; /* singular URL processed */
case '{':
/* process set pattern */
res = glob_set(glob, ++pattern, ++pos, amount);
break;
case '[':
/* process range pattern */
res= glob_range(glob, ++pattern, ++pos, amount);
break;
}
if(GLOB_OK != res)
/* free that strdup'ed string again */
free(glob->literal[litindex]);
return res; /* something got wrong */
}
int glob_url(URLGlob** glob, char* url, int *urlnum, FILE *error)
{
/*
* We can deal with any-size, just make a buffer with the same length
* as the specified URL!
*/
URLGlob *glob_expand;
int amount;
char *glob_buffer=(char *)malloc(strlen(url)+1);
*glob = NULL;
if(NULL == glob_buffer)
return CURLE_OUT_OF_MEMORY;
glob_expand = (URLGlob*)calloc(sizeof(URLGlob), 1);
if(NULL == glob_expand) {
free(glob_buffer);
return CURLE_OUT_OF_MEMORY;
}
glob_expand->size = 0;
glob_expand->urllen = strlen(url);
glob_expand->glob_buffer = glob_buffer;
glob_expand->beenhere=0;
if(GLOB_OK == glob_word(glob_expand, url, 1, &amount))
*urlnum = amount;
else {
if(error && glob_expand->errormsg[0]) {
/* send error description to the error-stream */
fprintf(error, "curl: (%d) [globbing] %s\n",
CURLE_URL_MALFORMAT, glob_expand->errormsg);
}
/* it failed, we cleanup */
free(glob_buffer);
free(glob_expand);
glob_expand = NULL;
*urlnum = 1;
return CURLE_URL_MALFORMAT;
}
*glob = glob_expand;
return CURLE_OK;
}
void glob_cleanup(URLGlob* glob)
{
size_t i;
int elem;
for (i = glob->size - 1; i < glob->size; --i) {
if (!(i & 1)) { /* even indexes contain literals */
free(glob->literal[i/2]);
}
else { /* odd indexes contain sets or ranges */
if (glob->pattern[i/2].type == UPTSet) {
for (elem = glob->pattern[i/2].content.Set.size - 1;
elem >= 0;
--elem) {
free(glob->pattern[i/2].content.Set.elements[elem]);
}
free(glob->pattern[i/2].content.Set.elements);
}
}
}
free(glob->glob_buffer);
free(glob);
}
char *glob_next_url(URLGlob *glob)
{
char *buf = glob->glob_buffer;
URLPattern *pat;
char *lit;
size_t i;
size_t j;
if (!glob->beenhere)
glob->beenhere = 1;
else {
bool carry = TRUE;
/* implement a counter over the index ranges of all patterns,
starting with the rightmost pattern */
for (i = glob->size / 2 - 1; carry && i < glob->size; --i) {
carry = FALSE;
pat = &glob->pattern[i];
switch (pat->type) {
case UPTSet:
if (++pat->content.Set.ptr_s == pat->content.Set.size) {
pat->content.Set.ptr_s = 0;
carry = TRUE;
}
break;
case UPTCharRange:
pat->content.CharRange.ptr_c += pat->content.CharRange.step;
if (pat->content.CharRange.ptr_c > pat->content.CharRange.max_c) {
pat->content.CharRange.ptr_c = pat->content.CharRange.min_c;
carry = TRUE;
}
break;
case UPTNumRange:
pat->content.NumRange.ptr_n += pat->content.NumRange.step;
if (pat->content.NumRange.ptr_n > pat->content.NumRange.max_n) {
pat->content.NumRange.ptr_n = pat->content.NumRange.min_n;
carry = TRUE;
}
break;
default:
printf("internal error: invalid pattern type (%d)\n", (int)pat->type);
exit (CURLE_FAILED_INIT);
}
}
if (carry) /* first pattern ptr has run into overflow, done! */
return NULL;
}
for (j = 0; j < glob->size; ++j) {
if (!(j&1)) { /* every other term (j even) is a literal */
lit = glob->literal[j/2];
strcpy(buf, lit);
buf += strlen(lit);
}
else { /* the rest (i odd) are patterns */
pat = &glob->pattern[j/2];
switch(pat->type) {
case UPTSet:
strcpy(buf, pat->content.Set.elements[pat->content.Set.ptr_s]);
buf += strlen(pat->content.Set.elements[pat->content.Set.ptr_s]);
break;
case UPTCharRange:
*buf++ = pat->content.CharRange.ptr_c;
break;
case UPTNumRange:
sprintf(buf, "%0*d",
pat->content.NumRange.padlength, pat->content.NumRange.ptr_n);
buf += strlen(buf); /* make no sprint() return code assumptions */
break;
default:
printf("internal error: invalid pattern type (%d)\n", (int)pat->type);
exit (CURLE_FAILED_INIT);
}
}
}
*buf = '\0';
return strdup(glob->glob_buffer);
}
char *glob_match_url(char *filename, URLGlob *glob)
{
char *target;
size_t allocsize;
size_t stringlen=0;
char numbuf[18];
char *appendthis = NULL;
size_t appendlen = 0;
/* We cannot use the glob_buffer for storage here since the filename may
* be longer than the URL we use. We allocate a good start size, then
* we need to realloc in case of need.
*/
allocsize=strlen(filename);
target = malloc(allocsize);
if(NULL == target)
return NULL; /* major failure */
while (*filename) {
if (*filename == '#' && isdigit((int)filename[1])) {
unsigned long i;
char *ptr = filename;
unsigned long num = strtoul(&filename[1], &filename, 10);
i = num-1;
if (num && (i <= glob->size / 2)) {
URLPattern pat = glob->pattern[i];
switch (pat.type) {
case UPTSet:
appendthis = pat.content.Set.elements[pat.content.Set.ptr_s];
appendlen = strlen(pat.content.Set.elements[pat.content.Set.ptr_s]);
break;
case UPTCharRange:
numbuf[0]=pat.content.CharRange.ptr_c;
numbuf[1]=0;
appendthis=numbuf;
appendlen=1;
break;
case UPTNumRange:
sprintf(numbuf, "%0*d",
pat.content.NumRange.padlength,
pat.content.NumRange.ptr_n);
appendthis = numbuf;
appendlen = strlen(numbuf);
break;
default:
printf("internal error: invalid pattern type (%d)\n",
(int)pat.type);
free(target);
return NULL;
}
}
else {
/* #[num] out of range, use the #[num] in the output */
filename = ptr;
appendthis=filename++;
appendlen=1;
}
}
else {
appendthis=filename++;
appendlen=1;
}
if(appendlen + stringlen >= allocsize) {
char *newstr;
allocsize = (appendlen + stringlen)*2;
newstr=realloc(target, allocsize);
if(NULL ==newstr) {
free(target);
return NULL;
}
target=newstr;
}
memcpy(&target[stringlen], appendthis, appendlen);
stringlen += appendlen;
}
target[stringlen]= '\0';
return target;
}
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