* revert to the in-place 'modest_text_utils_get_display_address',
[modest] / src / modest-text-utils.c
index 002897d..6b3709c 100644 (file)
-/* modest-ui.c */
+/* Copyright (c) 2006, Nokia Corporation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of the Nokia Corporation 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 THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
+ * 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.
+ */
 
-/* insert (c)/licensing information) */
 
-#include <gtk/gtk.h>
-#include <string.h>
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif /*_GNU_SOURCE*/
+#include <string.h> /* for strcasestr */
+
+
+#include <glib.h>
+#include <stdlib.h>
+#include <glib/gi18n.h>
+#include <regex.h>
+#include <modest-tny-platform-factory.h>
+#include <modest-text-utils.h>
+#include <modest-runtime.h>
 
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
-#endif /*HAVE_CONFIG_H*/
+#endif /*HAVE_CONFIG_H */
+
+/* defines */
+#define FORWARD_STRING _("mcen_ia_editor_original_message")
+#define FROM_STRING _("mail_va_from")
+#define SENT_STRING _("mcen_fi_message_properties_sent")
+#define TO_STRING _("mail_va_to")
+#define        SUBJECT_STRING _("mail_va_subject")
+#define EMPTY_STRING ""
 
+/*
+ * do the hyperlinkification only for texts < 50 Kb,
+ * as it's quite slow. Without this, e.g. mail with
+ * an uuencoded part (which is not recognized as attachment,
+ * will hang modest
+ */
+#define HYPERLINKIFY_MAX_LENGTH (1024*50)
+
+/*
+ * we need these regexps to find URLs in plain text e-mails
+ */
+typedef struct _url_match_pattern_t url_match_pattern_t;
+struct _url_match_pattern_t {
+       gchar   *regex;
+       regex_t *preg;
+       gchar   *prefix;
+};
+
+typedef struct _url_match_t url_match_t;
+struct _url_match_t {
+       guint offset;
+       guint len;
+       const gchar* prefix;
+};
+
+#define MAIL_VIEWER_URL_MATCH_PATTERNS  {                              \
+       { "(file|rtsp|http|ftp|https)://[-A-Za-z0-9_$.+!*(),;:@%&=?/~#]+[-A-Za-z0-9_$%&=?/~#]",\
+         NULL, NULL },\
+       { "www\\.[-a-z0-9.]+[-a-z0-9](:[0-9]*)?(/[-A-Za-z0-9_$.+!*(),;:@%&=?/~#]*[^]}\\),?!;:\"]?)?",\
+                       NULL, "http://" },                              \
+       { "ftp\\.[-a-z0-9.]+[-a-z0-9](:[0-9]*)?(/[-A-Za-z0-9_$.+!*(),;:@%&=?/~#]*[^]}\\),?!;:\"]?)?",\
+         NULL, "ftp://" },\
+       { "(voipto|callto|chatto|jabberto|xmpp):[-_a-z@0-9.\\+]+", \
+          NULL, NULL},                                             \
+       { "mailto:[-_a-z0-9.\\+]+@[-_a-z0-9.]+",                    \
+         NULL, NULL},\
+       { "[-_a-z0-9.\\+]+@[-_a-z0-9.]+",\
+         NULL, "mailto:"}\
+       }
+
+const gchar account_title_forbidden_chars[] = {
+       '\\', '/', ':', '*', '?', '\'', '<', '>', '|', '^'
+};
+const gchar folder_name_forbidden_chars[] = {
+       '<', '>', ':', '\'', '/', '\\', '|', '?', '*', '^', '%', '$'
+};
+const gchar user_name_forbidden_chars[] = {
+       '<', '>'
+};
+const guint ACCOUNT_TITLE_FORBIDDEN_CHARS_LENGTH = G_N_ELEMENTS (account_title_forbidden_chars);
+const guint FOLDER_NAME_FORBIDDEN_CHARS_LENGTH = G_N_ELEMENTS (folder_name_forbidden_chars);
+const guint USER_NAME_FORBIDDEN_CHARS_LENGTH = G_N_ELEMENTS (user_name_forbidden_chars);
 
 /* private */
-static GString *
-get_next_line(GtkTextBuffer *b, GtkTextIter *iter);
+static gchar*   cite                    (const time_t sent_date, const gchar *from);
+static void     hyperlinkify_plain_text (GString *txt);
+static gint     cmp_offsets_reverse     (const url_match_t *match1, const url_match_t *match2);
+static GSList*  get_url_matches         (GString *txt);
 
-static int
-get_indent_level(const char *l);
+static GString* get_next_line           (const char *b, const gsize blen, const gchar * iter);
+static int      get_indent_level        (const char *l);
+static void     unquote_line            (GString * l);
+static void     append_quoted           (GString * buf, const int indent, const GString * str, 
+                                        const int cutpoint);
+static int      get_breakpoint_utf8     (const gchar * s, const gint indent, const gint limit);
+static int      get_breakpoint_ascii    (const gchar * s, const gint indent, const gint limit);
+static int      get_breakpoint          (const gchar * s, const gint indent, const gint limit);
 
-static void
-unquote_line(GString *l);
+static gchar*   modest_text_utils_quote_plain_text (const gchar *text, 
+                                                   const gchar *cite, 
+                                                   const gchar *signature,
+                                                   GList *attachments, 
+                                                   int limit);
 
-static void
-append_quoted(GString *buf, const int indent, const GString *str, const int cutpoint);
+static gchar*   modest_text_utils_quote_html       (const gchar *text, 
+                                                   const gchar *cite,
+                                                   const gchar *signature,
+                                                   GList *attachments,
+                                                   int limit);
+static gchar*   get_email_from_address (const gchar *address);
 
-static int
-get_breakpoint_utf8(const gchar *s, const gint indent, const gint limit);
 
-static int
-get_breakpoint_ascii(const gchar *s, const gint indent, const gint limit);
+/* ******************************************************************* */
+/* ************************* PUBLIC FUNCTIONS ************************ */
+/* ******************************************************************* */
 
-static int
-get_breakpoint(const gchar *s, const gint indent, const gint limit);
+gchar *
+modest_text_utils_quote (const gchar *text, 
+                        const gchar *content_type,
+                        const gchar *signature,
+                        const gchar *from,
+                        const time_t sent_date, 
+                        GList *attachments,
+                        int limit)
+{
+       gchar *retval, *cited;
 
-static GString *
-get_next_line(GtkTextBuffer *b, GtkTextIter *iter)
+       g_return_val_if_fail (text, NULL);
+       g_return_val_if_fail (content_type, NULL);
+
+       cited = cite (sent_date, from);
+       
+       if (content_type && strcmp (content_type, "text/html") == 0)
+               /* TODO: extract the <body> of the HTML and pass it to
+                  the function */
+               retval = modest_text_utils_quote_html (text, cited, signature, attachments, limit);
+       else
+               retval = modest_text_utils_quote_plain_text (text, cited, signature, attachments, limit);
+       
+       g_free (cited);
+       
+       return retval;
+}
+
+
+gchar *
+modest_text_utils_cite (const gchar *text,
+                       const gchar *content_type,
+                       const gchar *signature,
+                       const gchar *from,
+                       time_t sent_date)
+{
+       gchar *retval;
+       gchar *tmp_sig;
+       
+       g_return_val_if_fail (text, NULL);
+       g_return_val_if_fail (content_type, NULL);
+       
+       if (!signature)
+               retval = g_strdup ("");
+       else if (strcmp(content_type, "text/html") == 0) {
+               tmp_sig = g_strconcat ("\n", signature, NULL);
+               retval = modest_text_utils_convert_to_html_body(tmp_sig);
+               g_free (tmp_sig);
+       } else {
+               retval = g_strconcat (text, "\n", signature, NULL);
+       }
+
+       return retval;
+}
+
+static gchar *
+forward_cite (const gchar *from,
+             const gchar *sent,
+             const gchar *to,
+             const gchar *subject)
+{
+       return g_strdup_printf ("%s\n%s %s\n%s %s\n%s %s\n%s %s\n", 
+                               FORWARD_STRING, 
+                               FROM_STRING, (from)?from:"",
+                               SENT_STRING, sent,
+                               TO_STRING, (to)?to:"",
+                               SUBJECT_STRING, (subject)?subject:"");
+}
+
+gchar * 
+modest_text_utils_inline (const gchar *text,
+                         const gchar *content_type,
+                         const gchar *signature,
+                         const gchar *from,
+                         time_t sent_date,
+                         const gchar *to,
+                         const gchar *subject)
+{
+       gchar sent_str[101];
+       gchar *cited;
+       gchar *retval;
+       
+       g_return_val_if_fail (text, NULL);
+       g_return_val_if_fail (content_type, NULL);
+       
+       modest_text_utils_strftime (sent_str, 100, "%c", sent_date);
+
+       cited = forward_cite (from, sent_str, to, subject);
+       
+       if (content_type && strcmp (content_type, "text/html") == 0)
+               retval = modest_text_utils_quote_html (text, cited, signature, NULL, 80);
+       else
+               retval = modest_text_utils_quote_plain_text (text, cited, signature, NULL, 80);
+       
+       g_free (cited);
+       return retval;
+}
+
+/* just to prevent warnings:
+ * warning: `%x' yields only last 2 digits of year in some locales
+ */
+gsize
+modest_text_utils_strftime(char *s, gsize max, const char *fmt, time_t timet)
+{
+        struct tm tm;
+
+       /* does not work on old maemo glib: 
+        *   g_date_set_time_t (&date, timet);
+        */
+       localtime_r (&timet, &tm);
+       return strftime(s, max, fmt, &tm);
+}
+
+gchar *
+modest_text_utils_derived_subject (const gchar *subject, const gchar *prefix)
 {
-       GtkTextIter iter2;
        gchar *tmp;
+
+       g_return_val_if_fail (prefix, NULL);
+
+       if (!subject || subject[0] == '\0')
+               subject = _("mail_va_no_subject");
+
+       tmp = g_strchug (g_strdup (subject));
+
+       if (!strncmp (tmp, prefix, strlen (prefix))) {
+               return tmp;
+       } else {
+               g_free (tmp);
+               return g_strdup_printf ("%s %s", prefix, subject);
+       }
+}
+
+gchar*
+modest_text_utils_remove_address (const gchar *address_list, const gchar *address)
+{
+       gchar *dup, *token, *ptr, *result;
+       GString *filtered_emails;
+       gchar *email_address;
+
+       g_return_val_if_fail (address_list, NULL);
+
+       if (!address)
+               return g_strdup (address_list);
+
+       email_address = get_email_from_address (address);
+       
+       /* search for substring */
+       if (!strstr ((const char *) address_list, (const char *) email_address)) {
+               g_free (email_address);
+               return g_strdup (address_list);
+       }
+
+       dup = g_strdup (address_list);
+       filtered_emails = g_string_new (NULL);
+       
+       token = strtok_r (dup, ",", &ptr);
+
+       while (token != NULL) {
+               /* Add to list if not found */
+               if (!strstr ((const char *) token, (const char *) email_address)) {
+                       if (filtered_emails->len == 0)
+                               g_string_append_printf (filtered_emails, "%s", g_strstrip (token));
+                       else
+                               g_string_append_printf (filtered_emails, ",%s", g_strstrip (token));
+               }
+               token = strtok_r (NULL, ",", &ptr);
+       }
+       result = filtered_emails->str;
+
+       /* Clean */
+       g_free (email_address);
+       g_free (dup);
+       g_string_free (filtered_emails, FALSE);
+
+       return result;
+}
+
+static void
+modest_text_utils_convert_buffer_to_html (GString *html, const gchar *data)
+{
+       guint            i;
+       gboolean        space_seen = FALSE;
+       gsize           len;
+       guint           break_dist = 0; /* distance since last break point */
+
+       len = strlen (data);
+
+       /* replace with special html chars where needed*/
+       for (i = 0; i != len; ++i)  {
+               char kar = data[i];
+               
+               if (space_seen && kar != ' ') {
+                       g_string_append_c (html, ' ');
+                       space_seen = FALSE;
+               }
+               
+               /* we artificially insert a breakpoint (newline)
+                * after 256, to make sure our lines are not so long
+                * they will DOS the regexping later
+                */
+               if (++break_dist == 256) {
+                       g_string_append_c (html, '\n');
+                       break_dist = 0;
+               }
+               
+               switch (kar) {
+               case 0:  break; /* ignore embedded \0s */       
+               case '<'  : g_string_append (html, "&lt;");   break;
+               case '>'  : g_string_append (html, "&gt;");   break;
+               case '&'  : g_string_append (html, "&amp;");  break;
+               case '"'  : g_string_append (html, "&quot;");  break;
+
+               /* don't convert &apos; --> wpeditor will try to re-convert it... */    
+               //case '\'' : g_string_append (html, "&apos;"); break;
+               case '\n' : g_string_append (html, "<br>\n");              break_dist= 0; break;
+               case '\t' : g_string_append (html, "&nbsp;&nbsp;&nbsp; "); break_dist=0; break; /* note the space at the end*/
+               case ' ':
+                       break_dist = 0;
+                       if (space_seen) { /* second space in a row */
+                               g_string_append (html, "&nbsp; ");
+                               space_seen = FALSE;
+                       } else
+                               space_seen = TRUE;
+                       break;
+               default:
+                       g_string_append_c (html, kar);
+               }
+       }
+}
+
+gchar*
+modest_text_utils_convert_to_html (const gchar *data)
+{
+       GString         *html;      
+       gsize           len;
        
-       gtk_text_buffer_get_iter_at_line_offset(b,
-                       &iter2,
-                       gtk_text_iter_get_line(iter),
-                       gtk_text_iter_get_chars_in_line(iter) -1
-               );
-       tmp = gtk_text_buffer_get_text(b, &iter2, iter, FALSE);
-       gtk_text_iter_forward_line(iter);
-       return g_string_new(tmp);
+       if (!data)
+               return NULL;
+
+       len = strlen (data);
+       html = g_string_sized_new (1.5 * len);  /* just a  guess... */
+
+       g_string_append_printf (html,
+                               "<html><head>"
+                               "<meta http-equiv=\"content-type\" content=\"text/html; charset=utf8\">"
+                               "</head>"
+                               "<body>");
+
+       modest_text_utils_convert_buffer_to_html (html, data);
+       
+       g_string_append (html, "</body></html>");
+
+       if (len <= HYPERLINKIFY_MAX_LENGTH)
+               hyperlinkify_plain_text (html);
+
+       return g_string_free (html, FALSE);
 }
 
+gchar *
+modest_text_utils_convert_to_html_body (const gchar *data)
+{
+       GString         *html;      
+       gsize           len;
+       
+       if (!data)
+               return NULL;
+
+       len = strlen (data);
+       html = g_string_sized_new (1.5 * len);  /* just a  guess... */
+
+       modest_text_utils_convert_buffer_to_html (html, data);
+
+       if (len < HYPERLINKIFY_MAX_LENGTH)
+               hyperlinkify_plain_text (html);
+
+       return g_string_free (html, FALSE);
+}
+
+void
+modest_text_utils_get_addresses_indexes (const gchar *addresses, GSList **start_indexes, GSList **end_indexes)
+{
+       gchar *current, *start, *last_blank;
+       gint start_offset = 0, current_offset = 0;
+
+       g_return_if_fail (start_indexes != NULL);
+       g_return_if_fail (end_indexes != NULL);
+
+       start = (gchar *) addresses;
+       current = start;
+       last_blank = start;
+
+       while (*current != '\0') {
+               if ((start == current)&&((*current == ' ')||(*current == ',')||(*current == ';'))) {
+                       start = g_utf8_next_char (start);
+                       start_offset++;
+                       last_blank = current;
+               } else if ((*current == ',')||(*current == ';')) {
+                       gint *start_index, *end_index;
+                       start_index = g_new0(gint, 1);
+                       end_index = g_new0(gint, 1);
+                       *start_index = start_offset;
+                       *end_index = current_offset;
+                       *start_indexes = g_slist_prepend (*start_indexes, start_index);
+                       *end_indexes = g_slist_prepend (*end_indexes, end_index);
+                       start = g_utf8_next_char (current);
+                       start_offset = current_offset + 1;
+                       last_blank = start;
+               } else if (*current == '"') {
+                       current = g_utf8_next_char (current);
+                       current_offset ++;
+                       while ((*current != '"')&&(*current != '\0')) {
+                               current = g_utf8_next_char (current);
+                               current_offset ++;
+                       }
+               }
+                               
+               current = g_utf8_next_char (current);
+               current_offset ++;
+       }
+
+       if (start != current) {
+                       gint *start_index, *end_index;
+                       start_index = g_new0(gint, 1);
+                       end_index = g_new0(gint, 1);
+                       *start_index = start_offset;
+                       *end_index = current_offset;
+                       *start_indexes = g_slist_prepend (*start_indexes, start_index);
+                       *end_indexes = g_slist_prepend (*end_indexes, end_index);
+       }
+       
+       *start_indexes = g_slist_reverse (*start_indexes);
+       *end_indexes = g_slist_reverse (*end_indexes);
+
+       return;
+}
+
+GSList *
+modest_text_utils_split_addresses_list (const gchar *addresses)
+{
+       gchar *current, *start, *last_blank;
+       GSList *result = NULL;
+
+       start = (gchar *) addresses;
+       current = start;
+       last_blank = start;
+
+       while (*current != '\0') {
+               if ((start == current)&&((*current == ' ')||(*current == ',')||(*current == ';'))) {
+                       start = g_utf8_next_char (start);
+                       last_blank = current;
+               } else if ((*current == ',')||(*current == ';')) {
+                       gchar *new_address = NULL;
+                       new_address = g_strndup (start, current - last_blank);
+                       result = g_slist_prepend (result, new_address);
+                       start = g_utf8_next_char (current);
+                       last_blank = start;
+               } else if (*current == '\"') {
+                       if (current == start) {
+                               current = g_utf8_next_char (current);
+                               start = g_utf8_next_char (start);
+                       }
+                       while ((*current != '\"')&&(*current != '\0'))
+                               current = g_utf8_next_char (current);
+               }
+                               
+               current = g_utf8_next_char (current);
+       }
+
+       if (start != current) {
+               gchar *new_address = NULL;
+               new_address = g_strndup (start, current - last_blank);
+               result = g_slist_prepend (result, new_address);
+       }
+
+       result = g_slist_reverse (result);
+       return result;
+
+}
+
+void
+modest_text_utils_address_range_at_position (const gchar *recipients_list,
+                                            gint position,
+                                            gint *start,
+                                            gint *end)
+{
+       gchar *current = NULL;
+       gint range_start = 0;
+       gint range_end = 0;
+       gint index;
+       gboolean is_quoted = FALSE;
+
+       index = 0;
+       for (current = (gchar *) recipients_list; *current != '\0'; current = g_utf8_find_next_char (current, NULL)) {
+               gunichar c = g_utf8_get_char (current);
+
+               if ((c == ',') && (!is_quoted)) {
+                       if (index < position) {
+                               range_start = index + 1;
+                       } else {
+                               break;
+                       }
+               } else if (c == '\"') {
+                       is_quoted = !is_quoted;
+               } else if ((c == ' ') &&(range_start == index)) {
+                       range_start ++;
+               }
+               index ++;
+               range_end = index;
+       }
+
+       if (start)
+               *start = range_start;
+       if (end)
+               *end = range_end;
+}
+
+
+/* ******************************************************************* */
+/* ************************* UTILIY FUNCTIONS ************************ */
+/* ******************************************************************* */
+
+static GString *
+get_next_line (const gchar * b, const gsize blen, const gchar * iter)
+{
+       GString *gs;
+       const gchar *i0;
+       
+       if (iter > b + blen)
+               return g_string_new("");
+       
+       i0 = iter;
+       while (iter[0]) {
+               if (iter[0] == '\n')
+                       break;
+               iter++;
+       }
+       gs = g_string_new_len (i0, iter - i0);
+       return gs;
+}
 static int
-get_indent_level(const char *l)
+get_indent_level (const char *l)
 {
        int indent = 0;
-       
+
        while (l[0]) {
                if (l[0] == '>') {
                        indent++;
@@ -64,20 +597,24 @@ get_indent_level(const char *l)
                        break;
                }
                l++;
-               
+
        }
-       if (strcmp("-- ", l) == 0) {
-               return -1-indent;
+
+       /*      if we hit the signature marker "-- ", we return -(indent + 1). This
+        *      stops reformatting.
+        */
+       if (strcmp (l, "-- ") == 0) {
+               return -1 - indent;
        } else {
                return indent;
        }
 }
 
 static void
-unquote_line(GString *l) {
-       GString *r;
+unquote_line (GString * l)
+{
        gchar *p;
-       
+
        p = l->str;
        while (p[0]) {
                if (p[0] == '>') {
@@ -93,56 +630,60 @@ unquote_line(GString *l) {
 }
 
 static void
-append_quoted(GString *buf, int indent, const GString *str, const int cutpoint) {
+append_quoted (GString * buf, int indent, const GString * str,
+              const int cutpoint)
+{
        int i;
-       
-       indent = indent < 0? abs(indent) -1 : indent;
-       for (i=0; i<=indent; i++) {
-               g_string_append(buf, "> ");
+
+       indent = indent < 0 ? abs (indent) - 1 : indent;
+       for (i = 0; i <= indent; i++) {
+               g_string_append (buf, "> ");
        }
        if (cutpoint > 0) {
-               g_string_append_len(buf, str->str, cutpoint);
+               g_string_append_len (buf, str->str, cutpoint);
        } else {
-               g_string_append(buf, str->str);
+               g_string_append (buf, str->str);
        }
-       g_string_append(buf, "\n");
+       g_string_append (buf, "\n");
 }
 
 static int
-get_breakpoint_utf8(const gchar *s, gint indent, const gint limit) {
+get_breakpoint_utf8 (const gchar * s, gint indent, const gint limit)
+{
        gint index = 0;
        const gchar *pos, *last;
        gunichar *uni;
-       
-       indent = indent < 0? abs(indent) -1 : indent;
-       
+
+       indent = indent < 0 ? abs (indent) - 1 : indent;
+
        last = NULL;
        pos = s;
-       uni = g_utf8_to_ucs4_fast(s, -1, NULL);
+       uni = g_utf8_to_ucs4_fast (s, -1, NULL);
        while (pos[0]) {
                if ((index + 2 * indent > limit) && last) {
-                       g_free(uni);
+                       g_free (uni);
                        return last - s;
                }
-               if (g_unichar_isspace(uni[index])) {
+               if (g_unichar_isspace (uni[index])) {
                        last = pos;
                }
-               pos = g_utf8_next_char(pos);
+               pos = g_utf8_next_char (pos);
                index++;
        }
-       g_free(uni);
-       return strlen(s);
+       g_free (uni);
+       return strlen (s);
 }
 
 static int
-get_breakpoint_ascii(const gchar *s, const gint indent, const gint limit) {
+get_breakpoint_ascii (const gchar * s, const gint indent, const gint limit)
+{
        gint i, last;
-       
-       last = strlen(s);
+
+       last = strlen (s);
        if (last + 2 * indent < limit)
                return last;
-       
-       for ( i=strlen(s) ; i>0; i-- ) {
+
+       for (i = strlen (s); i > 0; i--) {
                if (s[i] == ' ') {
                        if (i + 2 * indent <= limit) {
                                return i;
@@ -155,63 +696,736 @@ get_breakpoint_ascii(const gchar *s, const gint indent, const gint limit) {
 }
 
 static int
-get_breakpoint(const gchar *s, const gint indent, const gint limit) {
-       
-       if (g_utf8_validate(s, -1, NULL)) {
-               return get_breakpoint_utf8(s, indent, limit);
-       } else { /* assume ASCII */
-               g_warning("invalid UTF-8 in msg");
-               return get_breakpoint_ascii(s, indent, limit);
+get_breakpoint (const gchar * s, const gint indent, const gint limit)
+{
+
+       if (g_utf8_validate (s, -1, NULL)) {
+               return get_breakpoint_utf8 (s, indent, limit);
+       } else {                /* assume ASCII */
+               //g_warning("invalid UTF-8 in msg");
+               return get_breakpoint_ascii (s, indent, limit);
        }
-}      
+}
 
-gchar *
-modest_text_utils_quote(GtkTextBuffer *buf, const gchar *from, const time_t sent_date, const int limit)
+static gchar *
+cite (const time_t sent_date, const gchar *from)
 {
-       GtkTextIter iter;
-       gint indent, breakpoint, rem_indent;
-       gchar sent_str[101];
-       GString *q, *l, *remaining; /* quoted msg, line */
-       
+       return g_strdup (_("mcen_ia_editor_original_message"));
+}
+
+static gchar *
+quoted_attachments (GList *attachments)
+{
+       GList *node = NULL;
+       GString *result = g_string_new ("");
+       for (node = attachments; node != NULL; node = g_list_next (node)) {
+               gchar *filename = (gchar *) node->data;
+               g_string_append_printf ( result, "%s %s\n", _("mcen_ia_editor_attach_filename"), filename);
+       }
+
+       return g_string_free (result, FALSE);
+
+}
+
+static gchar *
+modest_text_utils_quote_plain_text (const gchar *text, 
+                                   const gchar *cite, 
+                                   const gchar *signature,
+                                   GList *attachments,
+                                   int limit)
+{
+       const gchar *iter;
+       gint indent, breakpoint, rem_indent = 0;
+       GString *q, *l, *remaining;
+       gsize len;
+       gchar *attachments_string = NULL;
 
-       /* format sent_date */
-       strftime(sent_str, 100, "%c", localtime(&sent_date));
-       q = g_string_new("");
-       g_string_printf(q, "On %s, %s wrote:\n", sent_str, from);
-       
        /* remaining will store the rest of the line if we have to break it */
-       remaining = g_string_new("");
-       gtk_text_buffer_get_iter_at_line(buf, &iter, 0);
+       q = g_string_new ("\n");
+       q = g_string_append (q, cite);
+       q = g_string_append_c (q, '\n');
+       remaining = g_string_new ("");
+
+       iter = text;
+       len = strlen(text);
        do {
-               l = get_next_line(buf, &iter);
-               indent = get_indent_level(l->str);
-               unquote_line(l);
-               
+               l = get_next_line (text, len, iter);
+               iter = iter + l->len + 1;
+               indent = get_indent_level (l->str);
+               unquote_line (l);
+
                if (remaining->len) {
                        if (l->len && indent == rem_indent) {
-                               g_string_prepend(l, " ");
-                               g_string_prepend(l, remaining->str);
+                               g_string_prepend (l, " ");
+                               g_string_prepend (l, remaining->str);
                        } else {
                                do {
-                                       breakpoint = get_breakpoint(remaining->str, rem_indent, limit);
-                                       append_quoted(q, rem_indent, remaining, breakpoint);
-                                       g_string_erase(remaining, 0, breakpoint);
+                                       breakpoint =
+                                               get_breakpoint (remaining->str,
+                                                               rem_indent,
+                                                               limit);
+                                       append_quoted (q, rem_indent,
+                                                      remaining, breakpoint);
+                                       g_string_erase (remaining, 0,
+                                                       breakpoint);
                                        if (remaining->str[0] == ' ') {
-                                               g_string_erase(remaining, 0, 1);
-                                       }               
+                                               g_string_erase (remaining, 0,
+                                                               1);
+                                       }
                                } while (remaining->len);
                        }
                }
-               g_string_free(remaining, TRUE);
-               breakpoint = get_breakpoint(l->str, indent, limit);
-               remaining = g_string_new(l->str + breakpoint);
+               g_string_free (remaining, TRUE);
+               breakpoint = get_breakpoint (l->str, indent, limit);
+               remaining = g_string_new (l->str + breakpoint);
                if (remaining->str[0] == ' ') {
-                       g_string_erase(remaining, 0, 1);
+                       g_string_erase (remaining, 0, 1);
                }
                rem_indent = indent;
-               append_quoted(q, indent, l, breakpoint);
-               g_string_free(l, TRUE);
-       } while (!gtk_text_iter_is_end(&iter));
+               append_quoted (q, indent, l, breakpoint);
+               g_string_free (l, TRUE);
+       } while ((iter < text + len) || (remaining->str[0]));
+
+       attachments_string = quoted_attachments (attachments);
+       q = g_string_append (q, attachments_string);
+       g_free (attachments_string);
+
+       if (signature != NULL) {
+               q = g_string_append_c (q, '\n');
+               q = g_string_append (q, signature);
+       }
+
+       return g_string_free (q, FALSE);
+}
+
+static gchar*
+modest_text_utils_quote_html (const gchar *text, 
+                             const gchar *cite, 
+                             const gchar *signature,
+                             GList *attachments,
+                             int limit)
+{
+       gchar *result = NULL;
+       gchar *signature_result = NULL;
+       const gchar *format = \
+               "<!DOCTYPE html PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">\n" \
+               "<html>\n" \
+               "<body>\n" \
+               "<br/>%s<br/>" \
+               "<pre>%s<br/>%s<br/>%s</pre>\n" \
+               "</body>\n" \
+               "</html>\n";
+       gchar *attachments_string = NULL;
+       gchar *q_attachments_string = NULL;
+       gchar *q_cite = NULL;
+       gchar *html_text = NULL;
+
+       if (signature == NULL)
+               signature_result = g_strdup ("");
+       else
+               signature_result = modest_text_utils_convert_to_html_body (signature);
+
+       attachments_string = quoted_attachments (attachments);
+       q_attachments_string = modest_text_utils_convert_to_html_body (attachments_string);
+       q_cite = modest_text_utils_convert_to_html_body (cite);
+       html_text = modest_text_utils_convert_to_html_body (text);
+       result = g_strdup_printf (format, signature_result, q_cite, html_text, q_attachments_string);
+       g_free (q_cite);
+       g_free (html_text);
+       g_free (attachments_string);
+       g_free (q_attachments_string);
+       g_free (signature_result);
        
-       return g_string_free(q, FALSE);
+       return result;
+}
+
+static gint 
+cmp_offsets_reverse (const url_match_t *match1, const url_match_t *match2)
+{
+       return match2->offset - match1->offset;
+}
+
+
+static GSList*
+get_url_matches (GString *txt)
+{
+       regmatch_t rm;
+        guint rv, i, offset = 0;
+        GSList *match_list = NULL;
+
+       static url_match_pattern_t patterns[] = MAIL_VIEWER_URL_MATCH_PATTERNS;
+       const size_t pattern_num = sizeof(patterns)/sizeof(url_match_pattern_t);
+
+       /* initalize the regexps */
+       for (i = 0; i != pattern_num; ++i) {
+               patterns[i].preg = g_slice_new0 (regex_t);
+
+               /* this should not happen */
+               g_return_val_if_fail (regcomp (patterns[i].preg, patterns[i].regex,
+                                              REG_ICASE|REG_EXTENDED|REG_NEWLINE) == 0, NULL);
+       }
+        /* find all the matches */
+       for (i = 0; i != pattern_num; ++i) {
+               offset     = 0; 
+               while (1) {
+                       url_match_t *match;
+                       gboolean is_submatch;
+                       GSList *cursor;
+                       
+                       if ((rv = regexec (patterns[i].preg, txt->str + offset, 1, &rm, 0)) != 0) {
+                               g_return_val_if_fail (rv == REG_NOMATCH, NULL); /* this should not happen */
+                               break; /* try next regexp */ 
+                       }
+                       if (rm.rm_so == -1)
+                               break;
+                       
+                       is_submatch = FALSE;
+                       /* check  old matches to see if this has already been matched */
+                       cursor = match_list;
+                       while (cursor && !is_submatch) {
+                               const url_match_t *old_match =
+                                       (const url_match_t *) cursor->data;
+                               guint new_offset = offset + rm.rm_so;
+                               is_submatch = (new_offset >  old_match->offset &&
+                                              new_offset <  old_match->offset + old_match->len);
+                               cursor = g_slist_next (cursor);
+                       }
+
+                       if (!is_submatch) {
+                               /* make a list of our matches (<offset, len, prefix> tupels)*/
+                               match = g_slice_new (url_match_t);
+                               match->offset = offset + rm.rm_so;
+                               match->len    = rm.rm_eo - rm.rm_so;
+                               match->prefix = patterns[i].prefix;
+                               match_list = g_slist_prepend (match_list, match);
+                       }
+                               
+                       offset += rm.rm_eo;
+               }
+       }
+
+       for (i = 0; i != pattern_num; ++i) {
+               regfree (patterns[i].preg);
+               g_slice_free  (regex_t, patterns[i].preg);
+       } /* don't free patterns itself -- it's static */
+       
+       /* now sort the list, so the matches are in reverse order of occurence.
+        * that way, we can do the replacements starting from the end, so we don't need
+        * to recalculate the offsets
+        */
+       match_list = g_slist_sort (match_list,
+                                  (GCompareFunc)cmp_offsets_reverse); 
+       return match_list;      
+}
+
+
+
+static void
+hyperlinkify_plain_text (GString *txt)
+{
+       GSList *cursor;
+       GSList *match_list = get_url_matches (txt);
+
+       /* we will work backwards, so the offsets stay valid */
+       for (cursor = match_list; cursor; cursor = cursor->next) {
+
+               url_match_t *match = (url_match_t*) cursor->data;
+               gchar *url  = g_strndup (txt->str + match->offset, match->len);
+               gchar *repl = NULL; /* replacement  */
+
+               /* the prefix is NULL: use the one that is already there */
+               repl = g_strdup_printf ("<a href=\"%s%s\">%s</a>",
+                                       match->prefix ? match->prefix : EMPTY_STRING, 
+                                       url, url);
+
+               /* replace the old thing with our hyperlink
+                * replacement thing */
+               g_string_erase  (txt, match->offset, match->len);
+               g_string_insert (txt, match->offset, repl);
+               
+               g_free (url);
+               g_free (repl);
+
+               g_slice_free (url_match_t, match);      
+       }
+       
+       g_slist_free (match_list);
+}
+
+
+/* for optimization reasons, we change the string in-place */
+void
+modest_text_utils_get_display_address (gchar *address)
+{
+       int i;
+       
+       if (!address)
+               return;
+       
+       /* should not be needed, and otherwise, we probably won't screw up the address
+        * more than it already is :) 
+        * g_return_val_if_fail (g_utf8_validate (address, -1, NULL), NULL);
+        * */
+       
+       /* remove leading whitespace */
+       if (address[0] == ' ')
+               g_strchug (address);
+               
+       for (i = 0; address[i]; ++i) {
+               if (address[i] == '<') {
+                       if (G_UNLIKELY(i == 0))
+                               return; /* there's nothing else, leave it */
+                       else {
+                               address[i] = '\0'; /* terminate the string here */
+                               return;
+                       }
+               }
+       }
+}
+
+
+
+
+
+gchar *
+modest_text_utils_get_email_address (const gchar *full_address)
+{
+       const gchar *left, *right;
+       
+       if (!full_address)
+               return NULL;
+       
+       g_return_val_if_fail (g_utf8_validate (full_address, -1, NULL), NULL);
+       
+       left = g_strrstr_len (full_address, strlen(full_address), "<");
+       if (left == NULL)
+               return g_strdup (full_address);
+
+       right = g_strstr_len (left, strlen(left), ">");
+       if (right == NULL)
+               return g_strdup (full_address);
+
+       return g_strndup (left + 1, right - left - 1);
+}
+
+gint 
+modest_text_utils_get_subject_prefix_len (const gchar *sub)
+{
+       gint i;
+       static const gchar* prefix[] = {
+               "Re:", "RE:", "RV:", "re:"
+               "Fwd:", "FWD:", "FW:", "fwd:", "Fw:", "fw:", NULL
+       };
+               
+       if (!sub || (sub[0] != 'R' && sub[0] != 'F' && sub[0] != 'r' && sub[0] != 'f')) /* optimization */
+               return 0;
+
+       i = 0;
+       
+       while (prefix[i]) {
+               if (g_str_has_prefix(sub, prefix[i])) {
+                       int prefix_len = strlen(prefix[i]); 
+                       if (sub[prefix_len] == ' ')
+                               ++prefix_len; /* ignore space after prefix as well */
+                       return prefix_len; 
+               }
+               ++i;
+       }
+       return 0;
+}
+
+
+gint
+modest_text_utils_utf8_strcmp (const gchar* s1, const gchar *s2, gboolean insensitive)
+{
+       gint result = 0;
+       gchar *n1, *n2;
+
+       /* work even when s1 and/or s2 == NULL */
+       if (G_UNLIKELY(s1 == s2))
+               return 0;
+
+       /* if it's not case sensitive */
+       if (!insensitive)
+               return strcmp (s1 ? s1 : "", s2 ? s2 : "");
+       
+       n1 = g_utf8_collate_key (s1 ? s1 : "", -1);
+       n2 = g_utf8_collate_key (s2 ? s2 : "", -1);
+       
+       result = strcmp (n1, n2);
+
+       g_free (n1);
+       g_free (n2);
+       
+       return result;
+}
+
+
+gchar*
+modest_text_utils_get_display_date (time_t date)
+{
+       time_t now;
+       static const guint BUF_SIZE = 64; 
+       static const guint ONE_DAY = 24 * 60 * 60; /* seconds in one day */
+       gchar date_buf[BUF_SIZE];  
+       gchar today_buf [BUF_SIZE];  
+
+       modest_text_utils_strftime (date_buf, BUF_SIZE, "%x", date); 
+
+       now = time (NULL);
+
+       /* we check if the date is within the last 24h, if not, we don't
+        * have to do the extra, expensive strftime, which was very visible
+        * in the profiles.
+        */
+       if (abs(now - date) < ONE_DAY) {
+               
+               /* it's within the last 24 hours, but double check */
+               /* use the localized dates */
+               modest_text_utils_strftime (today_buf,  BUF_SIZE, "%x", now); 
+
+               /* if it's today, use the time instead */
+               if (strcmp (date_buf, today_buf) == 0)
+                       modest_text_utils_strftime (date_buf, BUF_SIZE, "%X", date);
+       }
+       
+       return g_strdup(date_buf);
+}
+
+
+gboolean
+modest_text_utils_validate_folder_name (const gchar *folder_name)
+{
+       /* based on http://msdn2.microsoft.com/en-us/library/aa365247.aspx,
+        * with some extras */
+       
+       guint len;
+       gint i;
+       const gchar **cursor = NULL;
+       const gchar *forbidden_names[] = { /* windows does not like these */
+               "CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4", "COM5", "COM6",
+               "COM7", "COM8", "COM9", "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
+               ".", "..", NULL
+       };
+       
+       /* cannot be NULL */
+       if (!folder_name) 
+               return FALSE;
+
+       /* cannot be empty */
+       len = strlen(folder_name);
+       if (len == 0)
+               return FALSE;
+       
+       /* cannot start or end with a space */
+       if (g_ascii_isspace(folder_name[0]) || g_ascii_isspace(folder_name[len - 1]))
+               return FALSE; 
+
+       /* cannot contain a forbidden char */   
+       for (i = 0; i < len; i++)
+               if (modest_text_utils_is_forbidden_char (folder_name[i], FOLDER_NAME_FORBIDDEN_CHARS))
+                       return FALSE;
+       
+       /* cannot contain a forbidden word */
+       if (len <= 4) {
+               for (cursor = forbidden_names; cursor && *cursor; ++cursor) {
+                       if (g_ascii_strcasecmp (folder_name, *cursor) == 0)
+                               return FALSE;
+               }
+       }
+       return TRUE; /* it's valid! */
+}
+
+
+
+gboolean
+modest_text_utils_validate_domain_name (const gchar *domain)
+{
+       gboolean valid = FALSE;
+       regex_t rx;
+       const gchar* domain_regex = "^[a-z0-9]([.]?[a-z0-9-])*[a-z0-9]$";
+
+       memset (&rx, 0, sizeof(regex_t)); /* coverity wants this... */
+       
+       if (!domain)
+               return FALSE;
+       
+       /* domain name: all alphanum or '-' or '.',
+        * but beginning/ending in alphanum */  
+       if (regcomp (&rx, domain_regex, REG_ICASE|REG_EXTENDED|REG_NOSUB)) {
+               g_warning ("BUG: error in regexp");
+               return FALSE;
+       }
+       
+       valid = (regexec (&rx, domain, 1, NULL, 0) == 0);
+       regfree (&rx);
+               
+       return valid;
+}
+
+
+
+gboolean
+modest_text_utils_validate_email_address (const gchar *email_address, const gchar **invalid_char_position)
+{
+       int count = 0;
+       const gchar *c = NULL, *domain = NULL;
+       static gchar *rfc822_specials = "()<>@,;:\\\"[]&";
+
+       if (invalid_char_position != NULL)
+               *invalid_char_position = NULL;
+       
+       /* check that the email adress contains exactly one @ */
+       if (!strstr(email_address, "@") || 
+                       (strstr(email_address, "@") != g_strrstr(email_address, "@")))
+       {
+               return FALSE;
+       }
+       
+       /* first we validate the name portion (name@domain) */
+       for (c = email_address;  *c;  c++) {
+               if (*c == '\"' && 
+                   (c == email_address || 
+                    *(c - 1) == '.' || 
+                    *(c - 1) == '\"')) {
+                       while (*++c) {
+                               if (*c == '\"') 
+                                       break;
+                               if (*c == '\\' && (*++c == ' ')) 
+                                       continue;
+                               if (*c <= ' ' || *c >= 127) 
+                                       return FALSE;
+                       }
+                       if (!*c++) 
+                               return FALSE;
+                       if (*c == '@') 
+                               break;
+                       if (*c != '.') 
+                               return FALSE;
+                       continue;
+               }
+               if (*c == '@') 
+                       break;
+               if (*c <= ' ' || *c >= 127) 
+                       return FALSE;
+               if (strchr(rfc822_specials, *c)) {
+                       if (invalid_char_position)
+                               *invalid_char_position = c;
+                       return FALSE;
+               }
+       }
+       if (c == email_address || *(c - 1) == '.') 
+               return FALSE;
+
+       /* next we validate the domain portion (name@domain) */
+       if (!*(domain = ++c)) 
+               return FALSE;
+       do {
+               if (*c == '.') {
+                       if (c == domain || *(c - 1) == '.' || *(c + 1) == '\0') 
+                               return FALSE;
+                       count++;
+               }
+               if (*c <= ' ' || *c >= 127) 
+                       return FALSE;
+               if (strchr(rfc822_specials, *c)) {
+                       if (invalid_char_position)
+                               *invalid_char_position = c;
+                       return FALSE;
+               }
+       } while (*++c);
+
+       return (count >= 1) ? TRUE : FALSE;
+}
+
+gboolean 
+modest_text_utils_validate_recipient (const gchar *recipient, const gchar **invalid_char_position)
+{
+       gchar *stripped, *current;
+       gchar *right_part;
+       gboolean has_error = FALSE;
+
+       if (modest_text_utils_validate_email_address (recipient, invalid_char_position))
+               return TRUE;
+       stripped = g_strdup (recipient);
+       stripped = g_strstrip (stripped);
+       current = stripped;
+
+       if (*current == '\0') {
+               g_free (stripped);
+               return FALSE;
+       }
+
+       /* quoted string */
+       if (*current == '\"') {
+               current = g_utf8_next_char (current);
+               has_error = TRUE;
+               for (; *current != '\0'; current = g_utf8_next_char (current)) {
+                       if (*current == '\\') {
+                               /* TODO: This causes a warning, which breaks the build, 
+                                * because a gchar cannot be < 0.
+                                * murrayc. 
+                               if (current[1] <0) {
+                                       has_error = TRUE;
+                                       break;
+                               }
+                               */
+                       } else if (*current == '\"') {
+                               has_error = FALSE;
+                               current = g_utf8_next_char (current);
+                               break;
+                       }
+               }
+       } else {
+               has_error = TRUE;
+               for (current = stripped ; *current != '\0'; current = g_utf8_next_char (current)) {
+                       if (*current == '<') {
+                               has_error = FALSE;
+                               break;
+                       }
+               }
+       }
+               
+       if (has_error) {
+               g_free (stripped);
+               return FALSE;
+       }
+
+       right_part = g_strdup (current);
+       g_free (stripped);
+       right_part = g_strstrip (right_part);
+
+       if (g_str_has_prefix (right_part, "<") &&
+           g_str_has_suffix (right_part, ">")) {
+               gchar *address;
+               gboolean valid;
+
+               address = g_strndup (right_part+1, strlen (right_part) - 2);
+               g_free (right_part);
+               valid = modest_text_utils_validate_email_address (address, invalid_char_position);
+               g_free (address);
+               return valid;
+       } else {
+               g_free (right_part);
+               return FALSE;
+       }
+}
+
+
+gchar *
+modest_text_utils_get_display_size (guint64 size)
+{
+       const guint KB=1024;
+       const guint MB=1024 * KB;
+       const guint GB=1024 * MB;
+
+       if (size == 0)
+               return g_strdup_printf(_FM("sfil_li_size_kb"), 0);
+       if (0 < size && size < KB)
+               return g_strdup_printf (_FM("sfil_li_size_kb"), 1);
+       else if (KB <= size && size < 100 * KB)
+               return g_strdup_printf (_FM("sfil_li_size_1kb_99kb"), size / KB);
+       else if (100*KB <= size && size < MB)
+               return g_strdup_printf (_FM("sfil_li_size_100kb_1mb"), (float) size / MB);
+       else if (MB <= size && size < 10*MB)
+               return g_strdup_printf (_FM("sfil_li_size_1mb_10mb"), (float) size / MB);
+       else if (10*MB <= size && size < GB)
+               return g_strdup_printf (_FM("sfil_li_size_10mb_1gb"), size / MB);
+       else
+               return g_strdup_printf (_FM("sfil_li_size_1gb_or_greater"), (float) size / GB); 
+}
+
+static gchar *
+get_email_from_address (const gchar * address)
+{
+       gchar *left_limit, *right_limit;
+
+       left_limit = strstr (address, "<");
+       right_limit = g_strrstr (address, ">");
+
+       if ((left_limit == NULL)||(right_limit == NULL)|| (left_limit > right_limit))
+               return g_strdup (address);
+       else
+               return g_strndup (left_limit + 1, (right_limit - left_limit) - 1);
+}
+
+gchar *      
+modest_text_utils_get_color_string (GdkColor *color)
+{
+
+       return g_strdup_printf ("#%x%x%x%x%x%x%x%x%x%x%x%x",
+                               (color->red >> 12)   & 0xf, (color->red >> 8)   & 0xf,
+                               (color->red >>  4)   & 0xf, (color->red)        & 0xf,
+                               (color->green >> 12) & 0xf, (color->green >> 8) & 0xf,
+                               (color->green >>  4) & 0xf, (color->green)      & 0xf,
+                               (color->blue >> 12)  & 0xf, (color->blue >> 8)  & 0xf,
+                               (color->blue >>  4)  & 0xf, (color->blue)       & 0xf);
+}
+
+gchar *
+modest_text_utils_text_buffer_get_text (GtkTextBuffer *buffer)
+{
+       GtkTextIter start, end;
+       gchar *slice, *current;
+       GString *result = g_string_new ("");
+
+       g_return_val_if_fail (GTK_IS_TEXT_BUFFER (buffer), NULL);
+
+       gtk_text_buffer_get_start_iter (buffer, &start);
+       gtk_text_buffer_get_end_iter (buffer, &end);
+
+       slice = gtk_text_buffer_get_slice (buffer, &start, &end, FALSE);
+       current = slice;
+
+       while (current && current != '\0') {
+               if (g_utf8_get_char (current) == 0xFFFC) {
+                       result = g_string_append_c (result, ' ');
+                       current = g_utf8_next_char (current);
+               } else {
+                       gchar *next = g_utf8_strchr (current, -1, 0xFFFC);
+                       if (next == NULL) {
+                               result = g_string_append (result, current);
+                       } else {
+                               result = g_string_append_len (result, current, next - current);
+                       }
+                       current = next;
+               }
+       }
+       g_free (slice);
+
+       return g_string_free (result, FALSE);
+       
+}
+
+gboolean
+modest_text_utils_is_forbidden_char (const gchar character,
+                                    ModestTextUtilsForbiddenCharType type)
+{
+       gint i, len;
+       const gchar *forbidden_chars = NULL;
+       
+       /* We need to get the length in the switch because the
+          compiler needs to know the size at compile time */
+       switch (type) {
+       case ACCOUNT_TITLE_FORBIDDEN_CHARS:
+               forbidden_chars = account_title_forbidden_chars;
+               len = G_N_ELEMENTS (account_title_forbidden_chars);
+               break;
+       case FOLDER_NAME_FORBIDDEN_CHARS:
+               forbidden_chars = folder_name_forbidden_chars;
+               len = G_N_ELEMENTS (folder_name_forbidden_chars);
+               break;
+       case USER_NAME_FORBIDDEN_NAMES:
+               forbidden_chars = user_name_forbidden_chars;
+               len = G_N_ELEMENTS (user_name_forbidden_chars);
+               break;
+       default:
+               g_return_val_if_reached (TRUE);
+       }
+
+       for (i = 0; i < len ; i++)
+               if (forbidden_chars[i] == character)
+                       return TRUE;
+
+       return FALSE; /* it's valid! */
 }