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/*
Functions for escaping and unescaping strings
Copyright (C) 2009-2022
Free Software Foundation, Inc.
Written by:
Slava Zanko <slavazanko@gmail.com>, 2009;
Patrick Winnertz <winnie@debian.org>, 2009
This file is part of the Midnight Commander.
The Midnight Commander 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.
The Midnight Commander 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/>.
*/
#include <config.h>
#include "lib/global.h"
#include "lib/strescape.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/*** file scope type declarations ****************************************************************/
/*** file scope variables ************************************************************************/
static const char ESCAPE_SHELL_CHARS[] = " !#$%()&{}[]`?|<>;*\\\"'";
static const char ESCAPE_REGEX_CHARS[] = "^!#$%()&{}[]`?|<>;*+.\\";
static const char ESCAPE_GLOB_CHARS[] = "$*\\?";
/*** file scope functions ************************************************************************/
/*** public functions ****************************************************************************/
char *
strutils_escape (const char *src, gsize src_len, const char *escaped_chars,
gboolean escape_non_printable)
{
GString *ret;
gsize curr_index;
/* do NOT break allocation semantics */
if (src == NULL)
return NULL;
if (*src == '\0')
return strdup ("");
ret = g_string_new ("");
if (src_len == (gsize) (-1))
src_len = strlen (src);
for (curr_index = 0; curr_index < src_len; curr_index++)
{
if (escape_non_printable)
{
switch (src[curr_index])
{
case '\n':
g_string_append (ret, "\\n");
continue;
case '\t':
g_string_append (ret, "\\t");
continue;
case '\b':
g_string_append (ret, "\\b");
continue;
case '\0':
g_string_append (ret, "\\0");
continue;
default:
break;
}
}
if (strchr (escaped_chars, (int) src[curr_index]))
g_string_append_c (ret, '\\');
g_string_append_c (ret, src[curr_index]);
}
return g_string_free (ret, FALSE);
}
/* --------------------------------------------------------------------------------------------- */
char *
strutils_unescape (const char *src, gsize src_len, const char *unescaped_chars,
gboolean unescape_non_printable)
{
GString *ret;
gsize curr_index;
if (src == NULL)
return NULL;
if (*src == '\0')
return strdup ("");
ret = g_string_sized_new (16);
if (src_len == (gsize) (-1))
src_len = strlen (src);
src_len--;
for (curr_index = 0; curr_index < src_len; curr_index++)
{
if (src[curr_index] != '\\')
{
g_string_append_c (ret, src[curr_index]);
continue;
}
curr_index++;
if (unescaped_chars == ESCAPE_SHELL_CHARS && src[curr_index] == '$')
{
/* special case: \$ is used to disallow variable substitution */
g_string_append_c (ret, '\\');
}
else
{
if (unescape_non_printable)
{
switch (src[curr_index])
{
case 'n':
g_string_append_c (ret, '\n');
continue;
case 't':
g_string_append_c (ret, '\t');
continue;
case 'b':
g_string_append_c (ret, '\b');
continue;
case '0':
g_string_append_c (ret, '\0');
continue;
default:
break;
}
}
if (strchr (unescaped_chars, (int) src[curr_index]) == NULL)
g_string_append_c (ret, '\\');
}
g_string_append_c (ret, src[curr_index]);
}
g_string_append_c (ret, src[curr_index]);
return g_string_free (ret, FALSE);
}
/* --------------------------------------------------------------------------------------------- */
/**
* To be compatible with the general posix command lines we have to escape
* strings for the command line
*
* @param src string for escaping
*
* @return escaped string (which needs to be freed later) or NULL when NULL string is passed.
*/
char *
strutils_shell_escape (const char *src)
{
return strutils_escape (src, -1, ESCAPE_SHELL_CHARS, FALSE);
}
/* --------------------------------------------------------------------------------------------- */
char *
strutils_glob_escape (const char *src)
{
return strutils_escape (src, -1, ESCAPE_GLOB_CHARS, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
char *
strutils_regex_escape (const char *src)
{
return strutils_escape (src, -1, ESCAPE_REGEX_CHARS, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
/**
* Unescape paths or other strings for e.g the internal cd
* shell-unescape within a given buffer (writing to it!)
*
* @param text string for unescaping
*
* @return unescaped string (which needs to be freed)
*/
char *
strutils_shell_unescape (const char *text)
{
return strutils_unescape (text, -1, ESCAPE_SHELL_CHARS, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
char *
strutils_glob_unescape (const char *text)
{
return strutils_unescape (text, -1, ESCAPE_GLOB_CHARS, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
char *
strutils_regex_unescape (const char *text)
{
return strutils_unescape (text, -1, ESCAPE_REGEX_CHARS, TRUE);
}
/* --------------------------------------------------------------------------------------------- */
/**
* Check if char in pointer contain escape'd chars
*
* @param start string for checking
* @param current pointer to checked character
*
* @return TRUE if string contain escaped chars otherwise return FALSE
*/
gboolean
strutils_is_char_escaped (const char *start, const char *current)
{
int num_esc = 0;
if (start == NULL || current == NULL || current <= start)
return FALSE;
current--;
while (current >= start && *current == '\\')
{
num_esc++;
current--;
}
return (gboolean) num_esc % 2;
}
/* --------------------------------------------------------------------------------------------- */
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