1 files changed, 1026 insertions, 0 deletions
diff --git a/lib/strutil/strutil.c b/lib/strutil/strutil.c
new file mode 100644
index 0000000..0c5f96a
--- /dev/null
+++ b/lib/strutil/strutil.c
@@ -0,0 +1,1026 @@
+/*
+   Common strings utilities
+
+   Copyright (C) 2007-2023
+   Free Software Foundation, Inc.
+
+   Written by:
+   Rostislav Benes, 2007
+
+   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 <stdlib.h>
+#include <langinfo.h>
+#include <string.h>
+#include <errno.h>
+
+#include "lib/global.h"
+#include "lib/util.h"           /* MC_PTR_FREE */
+#include "lib/strutil.h"
+
+/*** global variables ****************************************************************************/
+
+GIConv str_cnv_to_term;
+GIConv str_cnv_from_term;
+GIConv str_cnv_not_convert = INVALID_CONV;
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* names, that are used for utf-8 */
+static const char *const str_utf8_encodings[] = {
+    "utf-8",
+    "utf8",
+    NULL
+};
+
+/* standard 8bit encodings, no wide or multibytes characters */
+static const char *const str_8bit_encodings[] = {
+    /* Solaris has different names of Windows 1251 encoding */
+#ifdef __sun
+    "ansi-1251",
+    "ansi1251",
+#else
+    "cp-1251",
+    "cp1251",
+#endif
+    "cp-1250",
+    "cp1250",
+    "cp-866",
+    "cp866",
+    "ibm-866",
+    "ibm866",
+    "cp-850",
+    "cp850",
+    "cp-852",
+    "cp852",
+    "iso-8859",
+    "iso8859",
+    "koi8",
+    NULL
+};
+
+/* terminal encoding */
+static char *codeset = NULL;
+static char *term_encoding = NULL;
+/* function for encoding specific operations */
+static struct str_class used_class;
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+/* if enc is same encoding like on terminal */
+static int
+str_test_not_convert (const char *enc)
+{
+    return g_ascii_strcasecmp (enc, codeset) == 0;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static estr_t
+_str_convert (GIConv coder, const char *string, int size, GString * buffer)
+{
+    estr_t state = ESTR_SUCCESS;
+    gssize left;
+    gsize bytes_read = 0;
+    gsize bytes_written = 0;
+
+    errno = 0;                  /* FIXME: is it really needed? */
+
+    if (coder == INVALID_CONV)
+        return ESTR_FAILURE;
+
+    if (string == NULL || buffer == NULL)
+        return ESTR_FAILURE;
+
+    /*
+       if (! used_class.is_valid_string (string))
+       {
+       return ESTR_FAILURE;
+       }
+     */
+    if (size < 0)
+        size = strlen (string);
+    else
+    {
+        left = strlen (string);
+        if (left < size)
+            size = left;
+    }
+
+    left = size;
+    g_iconv (coder, NULL, NULL, NULL, NULL);
+
+    while (left != 0)
+    {
+        gchar *tmp_buff;
+        GError *mcerror = NULL;
+
+        tmp_buff = g_convert_with_iconv ((const gchar *) string,
+                                         left, coder, &bytes_read, &bytes_written, &mcerror);
+        if (mcerror != NULL)
+        {
+            int code = mcerror->code;
+
+            g_error_free (mcerror);
+            mcerror = NULL;
+
+            switch (code)
+            {
+            case G_CONVERT_ERROR_NO_CONVERSION:
+                /* Conversion between the requested character sets is not supported. */
+                g_free (tmp_buff);
+                tmp_buff = g_strnfill (strlen (string), '?');
+                g_string_append (buffer, tmp_buff);
+                g_free (tmp_buff);
+                return ESTR_FAILURE;
+
+            case G_CONVERT_ERROR_ILLEGAL_SEQUENCE:
+                /* Invalid byte sequence in conversion input. */
+                if ((tmp_buff == NULL) && (bytes_read != 0))
+                    /* recode valid byte sequence */
+                    tmp_buff = g_convert_with_iconv ((const gchar *) string,
+                                                     bytes_read, coder, NULL, NULL, NULL);
+
+                if (tmp_buff != NULL)
+                {
+                    g_string_append (buffer, tmp_buff);
+                    g_free (tmp_buff);
+                }
+
+                if ((int) bytes_read >= left)
+                    return ESTR_PROBLEM;
+
+                string += bytes_read + 1;
+                size -= (bytes_read + 1);
+                left -= (bytes_read + 1);
+                g_string_append_c (buffer, *(string - 1));
+                state = ESTR_PROBLEM;
+                break;
+
+            case G_CONVERT_ERROR_PARTIAL_INPUT:
+                /* Partial character sequence at end of input. */
+                g_string_append (buffer, tmp_buff);
+                g_free (tmp_buff);
+                if ((int) bytes_read < left)
+                {
+                    left = left - bytes_read;
+                    tmp_buff = g_strnfill (left, '?');
+                    g_string_append (buffer, tmp_buff);
+                    g_free (tmp_buff);
+                }
+                return ESTR_PROBLEM;
+
+            case G_CONVERT_ERROR_BAD_URI:      /* Don't know how handle this error :( */
+            case G_CONVERT_ERROR_NOT_ABSOLUTE_PATH:    /* Don't know how handle this error :( */
+            case G_CONVERT_ERROR_FAILED:       /* Conversion failed for some reason. */
+            default:
+                g_free (tmp_buff);
+                return ESTR_FAILURE;
+            }
+        }
+        else if (tmp_buff == NULL)
+        {
+            g_string_append (buffer, string);
+            return ESTR_PROBLEM;
+        }
+        else if (*tmp_buff == '\0')
+        {
+            g_free (tmp_buff);
+            g_string_append (buffer, string);
+            return state;
+        }
+        else
+        {
+            g_string_append (buffer, tmp_buff);
+            g_free (tmp_buff);
+            string += bytes_read;
+            left -= bytes_read;
+        }
+    }
+
+    return state;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+str_test_encoding_class (const char *encoding, const char *const *table)
+{
+    int result = 0;
+
+    if (encoding != NULL)
+    {
+        int t;
+
+        for (t = 0; table[t] != NULL; t++)
+            if (g_ascii_strncasecmp (encoding, table[t], strlen (table[t])) == 0)
+                result++;
+    }
+
+    return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static void
+str_choose_str_functions (void)
+{
+    if (str_test_encoding_class (codeset, str_utf8_encodings))
+        used_class = str_utf8_init ();
+    else if (str_test_encoding_class (codeset, str_8bit_encodings))
+        used_class = str_8bit_init ();
+    else
+        used_class = str_ascii_init ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+GIConv
+str_crt_conv_to (const char *to_enc)
+{
+    return (!str_test_not_convert (to_enc)) ? g_iconv_open (to_enc, codeset) : str_cnv_not_convert;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+GIConv
+str_crt_conv_from (const char *from_enc)
+{
+    return (!str_test_not_convert (from_enc))
+        ? g_iconv_open (codeset, from_enc) : str_cnv_not_convert;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_close_conv (GIConv conv)
+{
+    if (conv != str_cnv_not_convert)
+        g_iconv_close (conv);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+estr_t
+str_convert (GIConv coder, const char *string, GString * buffer)
+{
+    return _str_convert (coder, string, -1, buffer);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+estr_t
+str_nconvert (GIConv coder, const char *string, int size, GString * buffer)
+{
+    return _str_convert (coder, string, size, buffer);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gchar *
+str_conv_gerror_message (GError * mcerror, const char *def_msg)
+{
+    return used_class.conv_gerror_message (mcerror, def_msg);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+estr_t
+str_vfs_convert_from (GIConv coder, const char *string, GString * buffer)
+{
+    estr_t result = ESTR_SUCCESS;
+
+    if (coder == str_cnv_not_convert)
+        g_string_append (buffer, string != NULL ? string : "");
+    else
+        result = _str_convert (coder, string, -1, buffer);
+
+    return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+estr_t
+str_vfs_convert_to (GIConv coder, const char *string, int size, GString * buffer)
+{
+    return used_class.vfs_convert_to (coder, string, size, buffer);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_printf (GString * buffer, const char *format, ...)
+{
+    va_list ap;
+    va_start (ap, format);
+
+    g_string_append_vprintf (buffer, format, ap);
+    va_end (ap);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_insert_replace_char (GString * buffer)
+{
+    used_class.insert_replace_char (buffer);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+estr_t
+str_translate_char (GIConv conv, const char *keys, size_t ch_size, char *output, size_t out_size)
+{
+    size_t left;
+    size_t cnv;
+
+    g_iconv (conv, NULL, NULL, NULL, NULL);
+
+    left = (ch_size == (size_t) (-1)) ? strlen (keys) : ch_size;
+
+    cnv = g_iconv (conv, (gchar **) & keys, &left, &output, &out_size);
+    if (cnv == (size_t) (-1))
+        return (errno == EINVAL) ? ESTR_PROBLEM : ESTR_FAILURE;
+
+    output[0] = '\0';
+    return ESTR_SUCCESS;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_detect_termencoding (void)
+{
+    if (term_encoding == NULL)
+    {
+        /* On Linux, nl_langinfo (CODESET) returns upper case UTF-8 whether the LANG is set
+           to utf-8 or UTF-8.
+           On Mac OS X, it returns the same case as the LANG input.
+           So let transform result of nl_langinfo (CODESET) to upper case  unconditionally. */
+        term_encoding = g_ascii_strup (nl_langinfo (CODESET), -1);
+    }
+
+    return term_encoding;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_isutf8 (const char *codeset_name)
+{
+    return (str_test_encoding_class (codeset_name, str_utf8_encodings) != 0);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_init_strings (const char *termenc)
+{
+    codeset = termenc != NULL ? g_ascii_strup (termenc, -1) : g_strdup (str_detect_termencoding ());
+
+    str_cnv_not_convert = g_iconv_open (codeset, codeset);
+    if (str_cnv_not_convert == INVALID_CONV)
+    {
+        if (termenc != NULL)
+        {
+            g_free (codeset);
+            codeset = g_strdup (str_detect_termencoding ());
+            str_cnv_not_convert = g_iconv_open (codeset, codeset);
+        }
+
+        if (str_cnv_not_convert == INVALID_CONV)
+        {
+            g_free (codeset);
+            codeset = g_strdup (DEFAULT_CHARSET);
+            str_cnv_not_convert = g_iconv_open (codeset, codeset);
+        }
+    }
+
+    str_cnv_to_term = str_cnv_not_convert;
+    str_cnv_from_term = str_cnv_not_convert;
+
+    str_choose_str_functions ();
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_uninit_strings (void)
+{
+    if (str_cnv_not_convert != INVALID_CONV)
+        g_iconv_close (str_cnv_not_convert);
+    /* NULL-ize pointers to avoid double free in unit tests */
+    MC_PTR_FREE (term_encoding);
+    MC_PTR_FREE (codeset);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_term_form (const char *text)
+{
+    return used_class.term_form (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_fit_to_term (const char *text, int width, align_crt_t just_mode)
+{
+    return used_class.fit_to_term (text, width, just_mode);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_term_trim (const char *text, int width)
+{
+    return used_class.term_trim (text, width);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_term_substring (const char *text, int start, int width)
+{
+    return used_class.term_substring (text, start, width);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_get_next_char (char *text)
+{
+
+    used_class.cnext_char ((const char **) &text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_cget_next_char (const char *text)
+{
+    used_class.cnext_char (&text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_next_char (char **text)
+{
+    used_class.cnext_char ((const char **) text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_cnext_char (const char **text)
+{
+    used_class.cnext_char (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_get_prev_char (char *text)
+{
+    used_class.cprev_char ((const char **) &text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_cget_prev_char (const char *text)
+{
+    used_class.cprev_char (&text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_prev_char (char **text)
+{
+    used_class.cprev_char ((const char **) text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_cprev_char (const char **text)
+{
+    used_class.cprev_char (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_get_next_char_safe (char *text)
+{
+    used_class.cnext_char_safe ((const char **) &text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_cget_next_char_safe (const char *text)
+{
+    used_class.cnext_char_safe (&text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_next_char_safe (char **text)
+{
+    used_class.cnext_char_safe ((const char **) text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_cnext_char_safe (const char **text)
+{
+    used_class.cnext_char_safe (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_get_prev_char_safe (char *text)
+{
+    used_class.cprev_char_safe ((const char **) &text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_cget_prev_char_safe (const char *text)
+{
+    used_class.cprev_char_safe (&text);
+    return text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_prev_char_safe (char **text)
+{
+    used_class.cprev_char_safe ((const char **) text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_cprev_char_safe (const char **text)
+{
+    used_class.cprev_char_safe (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_next_noncomb_char (char **text)
+{
+    return used_class.cnext_noncomb_char ((const char **) text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_cnext_noncomb_char (const char **text)
+{
+    return used_class.cnext_noncomb_char (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_prev_noncomb_char (char **text, const char *begin)
+{
+    return used_class.cprev_noncomb_char ((const char **) text, begin);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_cprev_noncomb_char (const char **text, const char *begin)
+{
+    return used_class.cprev_noncomb_char (text, begin);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_is_valid_char (const char *ch, size_t size)
+{
+    return used_class.is_valid_char (ch, size);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_term_width1 (const char *text)
+{
+    return used_class.term_width1 (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_term_width2 (const char *text, size_t length)
+{
+    return used_class.term_width2 (text, length);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_term_char_width (const char *text)
+{
+    return used_class.term_char_width (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_offset_to_pos (const char *text, size_t length)
+{
+    return used_class.offset_to_pos (text, length);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_length (const char *text)
+{
+    return used_class.length (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_length_char (const char *text)
+{
+    return str_cget_next_char_safe (text) - text;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_length2 (const char *text, int size)
+{
+    return used_class.length2 (text, size);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_length_noncomb (const char *text)
+{
+    return used_class.length_noncomb (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_column_to_pos (const char *text, size_t pos)
+{
+    return used_class.column_to_pos (text, pos);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_isspace (const char *ch)
+{
+    return used_class.char_isspace (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_ispunct (const char *ch)
+{
+    return used_class.char_ispunct (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_isalnum (const char *ch)
+{
+    return used_class.char_isalnum (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_isdigit (const char *ch)
+{
+    return used_class.char_isdigit (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_toupper (const char *ch, char **out, size_t * remain)
+{
+    return used_class.char_toupper (ch, out, remain);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_tolower (const char *ch, char **out, size_t * remain)
+{
+    return used_class.char_tolower (ch, out, remain);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_isprint (const char *ch)
+{
+    return used_class.char_isprint (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_iscombiningmark (const char *ch)
+{
+    return used_class.char_iscombiningmark (ch);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_trunc (const char *text, int width)
+{
+    return used_class.trunc (text, width);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_create_search_needle (const char *needle, gboolean case_sen)
+{
+    return used_class.create_search_needle (needle, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_release_search_needle (char *needle, gboolean case_sen)
+{
+    used_class.release_search_needle (needle, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_search_first (const char *text, const char *search, gboolean case_sen)
+{
+    return used_class.search_first (text, search, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+const char *
+str_search_last (const char *text, const char *search, gboolean case_sen)
+{
+    return used_class.search_last (text, search, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+gboolean
+str_is_valid_string (const char *text)
+{
+    return used_class.is_valid_string (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_compare (const char *t1, const char *t2)
+{
+    return used_class.compare (t1, t2);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_ncompare (const char *t1, const char *t2)
+{
+    return used_class.ncompare (t1, t2);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_casecmp (const char *t1, const char *t2)
+{
+    return used_class.casecmp (t1, t2);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_ncasecmp (const char *t1, const char *t2)
+{
+    return used_class.ncasecmp (t1, t2);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_prefix (const char *text, const char *prefix)
+{
+    return used_class.prefix (text, prefix);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_caseprefix (const char *text, const char *prefix)
+{
+    return used_class.caseprefix (text, prefix);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_fix_string (char *text)
+{
+    used_class.fix_string (text);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_create_key (const char *text, gboolean case_sen)
+{
+    return used_class.create_key (text, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+str_create_key_for_filename (const char *text, gboolean case_sen)
+{
+    return used_class.create_key_for_filename (text, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+str_key_collate (const char *t1, const char *t2, gboolean case_sen)
+{
+    return used_class.key_collate (t1, t2, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_release_key (char *key, gboolean case_sen)
+{
+    used_class.release_key (key, case_sen);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+void
+str_msg_term_size (const char *text, int *lines, int *columns)
+{
+    char *p, *tmp;
+    char *q;
+    char c = '\0';
+
+    *lines = 1;
+    *columns = 0;
+
+    tmp = g_strdup (text);
+    p = tmp;
+
+    while (TRUE)
+    {
+        int width;
+
+        q = strchr (p, '\n');
+        if (q != NULL)
+        {
+            c = q[0];
+            q[0] = '\0';
+        }
+
+        width = str_term_width1 (p);
+        if (width > *columns)
+            *columns = width;
+
+        if (q == NULL)
+            break;
+
+        q[0] = c;
+        p = q + 1;
+        (*lines)++;
+    }
+
+    g_free (tmp);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+char *
+strrstr_skip_count (const char *haystack, const char *needle, size_t skip_count)
+{
+    char *semi;
+    ssize_t len;
+
+    len = strlen (haystack);
+
+    do
+    {
+        semi = g_strrstr_len (haystack, len, needle);
+        if (semi == NULL)
+            return NULL;
+        len = semi - haystack - 1;
+    }
+    while (skip_count-- != 0);
+
+    return semi;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/* Interpret string as a non-negative decimal integer, optionally multiplied by various values.
+ *
+ * @param str input value
+ * @param invalid set to TRUE if "str" does not represent a number in this format
+ *
+ * @return non-negative integer representation of "str", 0 in case of error.
+ */
+
+uintmax_t
+parse_integer (const char *str, gboolean * invalid)
+{
+    uintmax_t n;
+    char *suffix;
+    strtol_error_t e;
+
+    e = xstrtoumax (str, &suffix, 10, &n, "bcEGkKMPTwYZ0");
+    if (e == LONGINT_INVALID_SUFFIX_CHAR && *suffix == 'x')
+    {
+        uintmax_t multiplier;
+
+        multiplier = parse_integer (suffix + 1, invalid);
+        if (multiplier != 0 && n * multiplier / multiplier != n)
+        {
+            *invalid = TRUE;
+            return 0;
+        }
+
+        n *= multiplier;
+    }
+    else if (e != LONGINT_OK)
+    {
+        *invalid = TRUE;
+        n = 0;
+    }
+
+    return n;
+}
+
+/* --------------------------------------------------------------------------------------------- */