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cgiparam.cc
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cgiparam.cc
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/* cgiparam.cc: Parse CGI parameters
*
* Copyright 1999,2000,2001 BrightStation PLC
* Copyright 2001 James Aylett
* Copyright 2001 Ananova Ltd
* Copyright 2002,2003,2009,2011 Olly Betts
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/
#include <config.h>
#include "cgiparam.h"
#include "urldecode.h"
#include "urlencode.h"
#include <cstdio>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <map>
#include <string>
using namespace std;
multimap<string, string> cgi_params;
static void
add_param(string name, string val)
{
size_t i = name.length();
if (i > 2 && name[i - 2] == '.') {
// An image button called B gives B.x and B.y parameters with the
// coordinates of the click. We throw away the ".y" one and trim
// ".x" from the other.
if (name[i - 1] == 'y') return;
if (name[i - 1] == 'x') {
name.resize(i - 2);
// For an image button, the value of the CGI parameter is the
// coordinate of the click within the image - this is meaningless
// to us, so instead we turn "[ 2 ].x=NNN" into "[ 2 ]=2 ]", then
// below that gets turned into "[=2 ]". The trailing non-numeric
// characters are ignored by atoi().
i = name.find(' ');
if (i != string::npos)
val = name.substr(i + 1);
else {
i = name.find_first_not_of("0123456789");
if (i == string::npos) {
// For image buttons with entirely numeric names, make the
// value the name, and the name "#" - e.g. "2.x=NNN" becomes
// "#=2".
val = name;
name = '#';
} else {
// Otherwise we just copy the name into the value, so
// ">.x=NNN" becomes ">=>".
val = name;
}
}
}
}
// Truncate at first space - convert '[ page two ]=2'
// into '[=2'
i = name.find(' ');
if (i != string::npos) name.resize(i);
cgi_params.insert(multimap<string, string>::value_type(name, val));
}
void
CGIParameterHandler::operator()(const string& var, const string& val) const
{
add_param(var, val);
}
void
decode_argv(char **argv)
{
cgi_params.clear();
while (*argv) {
char *p = strchr(*argv, '=');
if (p) {
add_param(string(*argv, p), p + 1);
} else {
add_param(*argv, "");
}
++argv;
}
}
void
decode_test()
{
cgi_params.clear();
while (!feof(stdin)) {
string name, val;
bool had_equals = false;
while (1) {
int ch = getchar();
if (ch == EOF || ch == '\n') {
if (name.empty()) return; // end on blank line
add_param(name, val);
break;
}
if (had_equals) {
val += char(ch);
} else if (ch == '=') {
had_equals = true;
} else {
name += char(ch);
}
}
}
}
void
decode_post()
{
char *content_length;
size_t cl = INT_MAX;
content_length = getenv("CONTENT_LENGTH");
/* Netscape Fasttrack server for NT doesn't give CONTENT_LENGTH */
if (content_length) cl = atoi(content_length);
cgi_params.clear();
url_decode(CGIParameterHandler(), StdinItor(cl), StdinItor());
}
void
decode_get()
{
cgi_params.clear();
const char *q_str = getenv("QUERY_STRING");
// If QUERY_STRING isn't set, that's pretty broken, but don't segfault.
if (q_str)
url_decode(CGIParameterHandler(), CStringItor(q_str), CStringItor());
}