--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/libpurple/protocols/ircv3/purpleircv3formatting.c Thu Nov 16 23:50:35 2023 -0600
@@ -0,0 +1,114 @@
+/*
+ * Purple - Internet Messaging Library
+ * Copyright (C) Pidgin Developers <devel@pidgin.im>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "purpleircv3formatting.h"
+
+#define IRCV3_FORMAT_BOLD (0x02)
+#define IRCV3_FORMAT_COLOR (0x03)
+#define IRCV3_FORMAT_HEX_COLOR (0x04)
+#define IRCV3_FORMAT_ITALIC (0x1d)
+#define IRCV3_FORMAT_MONOSPACE (0x11)
+#define IRCV3_FORMAT_RESET (0x0f)
+#define IRCV3_FORMAT_REVERSE (0x16)
+#define IRCV3_FORMAT_STRIKETHROUGH (0x1e)
+#define IRCV3_FORMAT_UNDERLINE (0x1f)
+
+/******************************************************************************
+ * Helpers
+ *****************************************************************************/
+static inline gboolean
+purple_ircv3_formatting_is_hex_color(const char *text) {
+ for(int i = 0; i < 6; i++) {
+ if(text[i] == '\0') {
+ return FALSE;
+ }
+
+ if(!g_ascii_isxdigit(text[i])) {
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
+/******************************************************************************
+ * Public API
+ *****************************************************************************/
+char *
+purple_ircv3_formatting_strip(const char *text) {
+ GString *str = NULL;
+
+ /* We don't use purple_strempty here because if we're passed an empty
+ * string, we should return a newly allocated empty string.
+ */
+ if(text == NULL) {
+ return NULL;
+ }
+
+ str = g_string_new("");
+
+ for(int i = 0; text[i] != '\0'; i++) {
+ switch(text[i]) {
+ case IRCV3_FORMAT_BOLD:
+ case IRCV3_FORMAT_ITALIC:
+ case IRCV3_FORMAT_MONOSPACE:
+ case IRCV3_FORMAT_RESET:
+ case IRCV3_FORMAT_REVERSE:
+ case IRCV3_FORMAT_STRIKETHROUGH:
+ case IRCV3_FORMAT_UNDERLINE:
+ continue;
+ break;
+ case IRCV3_FORMAT_COLOR:
+ if(g_ascii_isdigit(text[i + 1])) {
+ i += 1;
+
+ if(g_ascii_isdigit(text[i + 1])) {
+ i += 1;
+ }
+
+ if(text[i + 1] == ',' && g_ascii_isdigit(text[i + 2])) {
+ i += 2;
+
+ if(g_ascii_isdigit(text[i + 1])) {
+ i += 1;
+ }
+ }
+ }
+
+ break;
+ case IRCV3_FORMAT_HEX_COLOR:
+ if(purple_ircv3_formatting_is_hex_color(&text[i + 1])) {
+ i += 6;
+ }
+
+ if(text[i + 1] == ',' &&
+ purple_ircv3_formatting_is_hex_color(&text[i + 2]))
+ {
+ i += 7;
+ }
+
+ break;
+ default:
+ g_string_append_c(str, text[i]);
+ break;
+ }
+
+ }
+
+ return g_string_free(str, FALSE);
+}