Return to tools.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / libaitwww / src

version 3.0

/*************************************************************************
* (C) 2012 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: tools.c,v 1.5 2013/05/30 09:25:35 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


/*
 * www_cmp() - Compare two string
 *
 * @ct = content text from www
 * @s = string
 * return: 0 are equal or !0 are different
 */
int
www_cmp(const char *ct, const char *s)
{
	char *sc;

	assert(ct && s);

	while (isspace((int) *ct))
		ct++;

	if (!(sc = strchr(ct, ';')))
		sc = strchr(ct, '\x0');
	while (isspace((int) *(sc - 1)))
		sc--;

	if (strlen(s) != sc - ct)
		return -1;
	return strncasecmp(ct, s, sc - ct);
}

/*
 * www_cmptype() - Compare context type
 *
 * @ct = content text from www
 * @type = content type
 * return: 0 are equal or !0 are different
 */
int
www_cmptype(const char *ct, const char *type)
{
	char *sl;

	assert(ct && type);

	while (isspace((int) *ct))
		ct++;

	if (!(sl = strchr(ct, '/')))
		return -1;

	if (strlen(type) != sl - ct)
		return 1;
	return strncasecmp(ct, type, sl - ct);
}

/*
 * www_getpair() - Get AV pair from WWW query string
 *
 * @str = query string
 * @delim = delimiter
 * return: NULL error or AV pair, must be e_free() after use!
 */
ait_val_t *
www_getpair(char ** __restrict str, const char *delim)
{
	char *tr;
	int cx;
	ait_val_t *s;

	assert(str && *str && delim);

	s = ait_allocVar();
	if (!s) {
		www_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
		return NULL;
	}

	cx = strcspn(*str, delim);
	tr = *str + cx;
	if (*tr)
		*tr++ = 0;

	AIT_SET_STR(s, *str);

	*str = tr;
	return s;
}

/*
 * www_x2c() - Hex from string to digit
 *
 * @str = string
 * return: digit
 */
char
www_x2c(const char *str)
{
	register char digit;

	assert(str);

	digit = (str[0] >= 'A' ? ((str[0] & 0xdf) - 'A') + 10 : (str[0] - '0'));
	digit *= 16;
	digit += (str[1] >= 'A' ? ((str[1] & 0xdf) - 'A') + 10 : (str[1] - '0'));

	return digit;
}

/*
 * www_unescape() - Unescape/decode WWW query string to host string
 *
 * @str = string
 * return: none
 */
void
www_unescape(char * __restrict str)
{
	register int i, j;

	if (!str)
		return;

	for (i = j = 0; str[j]; i++, j++) {
		str[i] = str[j];

		if (str[j] == '+')
			str[i] = ' ';
		else if (str[j] == '%') {
			str[i] = www_x2c(&str[j + 1]);
			j += 2;
		}
	}

	str[i] = 0;
}

/*
 * www_undot() - Undotted and clean WWW query filename
 *
 * @pname = query filename
 * return: =NULL error or !=NULL allocated valid filename, after use you must call ait_freeVar()
 */
ait_val_t *
www_undot(const char * __restrict pname)
{
	char *s, *s2, *fname;
	int l;
	ait_val_t *v;

	if (!pname)
		return NULL;
	/* check for valid query filename */
	if (*pname != '/')
		return NULL;

	v = ait_allocVar();
	if (!v) {
		www_SetErr(elwix_GetErrno(), "%s", elwix_GetError());
		return NULL;
	} else {
		AIT_SET_STR(v, pname + 1);
		fname = AIT_GET_STR(v);
	}

	/* collapse / sequences */
	if ((s = strstr(fname, "//"))) {
		s2 = s + 1;
		for (s2 = ++s; *s2 == '/'; s2++);
		memmove(s, s2, strlen(s2) + 1);
	}

	/* escaped ./ and /./ sequences */
	while (!strncmp(fname, "./", 2))
		memmove(fname, fname + 2, strlen(fname + 1));
	while ((s = strstr(fname, "/./")))
		memmove(s, s + 2, strlen(s + 1));

	/* alternate between removing leading ../ and removing xxx/../ */
	while (42) {
		while (!strncmp(fname, "../", 3))
			memmove(fname, fname + 3, strlen(fname + 2));
		if (!(s = strstr(fname, "/../")))
			break;
		for (s2 = s - 1; s2 >= fname && *s2 != '/'; --s2);
		memmove(s2 + 1, s + 4, strlen(s + 3));
	}

	/* elide any /.. at the end */
	while ((l = strlen(fname)) > 3 && 
			!strcmp((s = fname + l - 3), "/..")) {
		for (s2 = s - 1; s2 >= fname && *s2 != '/'; --s2);
		if (s2 < fname)
			break;
		*s2 = 0;
	}

	/* if filename is empry add current dir */
	if (!*fname) {
		AIT_FREE_VAL(v);
		AIT_SET_STR(v, "./");
		fname = AIT_GET_STR(v);
	}

	/* check for valid filename */
	if (*fname == '/' || (fname[0] == '.' && fname[1] == '.' && 
				(!fname[2] || fname[2] == '/'))) {
		ait_freeVar(&v);
		return NULL;
	}

	return v;
}