Adding upstream version 3:4.8.29.upstream/3%4.8.29upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/lib/strutil/strescape.c b/lib/strutil/strescape.c
new file mode 100644
index 0000000..9d1beeb
--- /dev/null
+++ b/lib/strutil/strescape.c
@@ -0,0 +1,259 @@
+/*
+   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;
+}
+
+/* --------------------------------------------------------------------------------------------- */