source: vbox/trunk/src/VBox/RDP/client-1.8.3/utils.c@ 74930

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Generic utility functions
   Copyright 2013 Henrik Andersson <[email protected]> for Cendio AB

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

/*
 * Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
 * other than GPL or LGPL is available it will apply instead, Oracle elects to use only
 * the General Public License version 2 (GPLv2) at this time for any software where
 * a choice of GPL license versions is made available with the language indicating
 * that GPLv2 or any later version may be used, or where a choice of which version
 * of the GPL is applied is otherwise unspecified.
 */

#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef HAVE_ICONV_H
#include <iconv.h>
#endif
#include "rdesktop.h"


#ifdef HAVE_ICONV
extern char g_codepage[16];
static RD_BOOL g_iconv_works = True;
#endif



char *
utils_string_escape(const char *str)
{
        const char *p;
        char *pe, *e, esc[4];
        size_t es;
        int cnt;

        /* count indices */
        cnt = 0;
        p = str;
        while (*(p++) != '\0')
                if ((unsigned char) *p < 32 || *p == '%')
                        cnt++;

        /* if no characters needs escaping return copy of str */
        if (cnt == 0)
                return strdup(str);

        /* allocate new mem for result */
        es = strlen(str) + (cnt * 3) + 1;
        pe = e = xmalloc(es);
        memset(e, 0, es);
        p = str;
        while (*p != '\0')
        {
                if ((unsigned char) *p < 32 || *p == '%')
                {
                        snprintf(esc, 4, "%%%02X", *p);
                        memcpy(pe, esc, 3);
                        pe += 3;
                }
                else
                {
                        *pe = *p;
                        pe++;
                }

                p++;
        }

        return e;
}

char *
utils_string_unescape(const char *str)
{
        char *ns, *ps, *pd, c;

        ns = xmalloc(strlen(str) + 1);
        memcpy(ns, str, strlen(str) + 1);
        ps = pd = ns;

        while (*ps != '\0')
        {
                /* check if found escaped character */
                if (ps[0] == '%')
                {
                        if (sscanf(ps, "%%%2hhX", &c) == 1)
                        {
                                pd[0] = c;
                                ps += 3;
                                pd++;
                                continue;
                        }
                }

                /* just copy over the char */
                *pd = *ps;
                ps++;
                pd++;
        }
        pd[0] = '\0';

        return ns;
}

int
utils_mkdir_safe(const char *path, int mask)
{
        int res = 0;
        struct stat st;

        res = stat(path, &st);
        if (res == -1)
                return mkdir(path, mask);

        if (!S_ISDIR(st.st_mode))
        {
                errno = EEXIST;
                return -1;
        }

        return 0;
}

int
utils_mkdir_p(const char *path, int mask)
{
        int res;
        char *ptok;
        char pt[PATH_MAX];
        char bp[PATH_MAX];

        if (!path || strlen(path) == 0)
        {
                errno = EINVAL;
                return -1;
        }
        if (strlen(path) > PATH_MAX)
        {
                errno = E2BIG;
                return -1;
        }

        res = 0;
        pt[0] = bp[0] = '\0';
        strcpy(bp, path);

        ptok = strtok(bp, "/");
        if (ptok == NULL)
                return utils_mkdir_safe(path, mask);

        do
        {
                if (ptok != bp)
                        strcat(pt, "/");

                strcat(pt, ptok);
                res = utils_mkdir_safe(pt, mask);
                if (res != 0)
                        return res;

        }
        while ((ptok = strtok(NULL, "/")) != NULL);

        return 0;
}

/* Convert from system locale string to utf-8 */
int
utils_locale_to_utf8(const char *src, size_t is, char *dest, size_t os)
{
#ifdef HAVE_ICONV
        static iconv_t *iconv_h = (iconv_t) - 1;
        if (strncmp(g_codepage, "UTF-8", strlen("UTF-8")) == 0)
                goto pass_trough_as_is;

        if (g_iconv_works == False)
                goto pass_trough_as_is;

        /* if not already initialize */
        if (iconv_h == (iconv_t) - 1)
        {
                if ((iconv_h = iconv_open("UTF-8", g_codepage)) == (iconv_t) - 1)
                {
                        warning("utils_string_to_utf8: iconv_open[%s -> %s] fail %p\n",
                                g_codepage, "UTF-8", iconv_h);

                        g_iconv_works = False;
                        goto pass_trough_as_is;
                }
        }

        /* convert string */
        if (iconv(iconv_h, (ICONV_CONST char **) &src, &is, &dest, &os) == (size_t) - 1)
        {
                iconv_close(iconv_h);
                iconv_h = (iconv_t) - 1;
                warning("utils_string_to_utf8: iconv(1) fail, errno %d\n", errno);

                g_iconv_works = False;
                goto pass_trough_as_is;
        }

        /* Out couldn't hold the entire convertion */
        if (is != 0)
                return -1;

#endif
      pass_trough_as_is:
        /* can dest hold strcpy of src */
        if (os < (strlen(src) + 1))
                return -1;

        memcpy(dest, src, strlen(src) + 1);
        return 0;
}