From c2426e88c9583fab1d58d7d26e3bbe9d500ea570 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Helleu?= <flashcode@flashtux.org>
Date: Wed, 23 Aug 2023 16:48:09 +0200
Subject: irc: add functions to convert strings to lower/upper case (following
 casemapping) (issue #194)

---
 src/plugins/irc/irc-server.c | 66 ++++++++++++++++++++++++++++++++++++++++++++
 src/plugins/irc/irc-server.h |  4 +++
 2 files changed, 70 insertions(+)

(limited to 'src')

diff --git a/src/plugins/irc/irc-server.c b/src/plugins/irc/irc-server.c
index 2cd37d1ff..1c4106796 100644
--- a/src/plugins/irc/irc-server.c
+++ b/src/plugins/irc/irc-server.c
@@ -333,6 +333,72 @@ irc_server_strncasecmp (struct t_irc_server *server,
     return weechat_strncasecmp_range (string1, string2, max, range);
 }
 
+/*
+ * Converts string to lower case, following server casemapping.
+ *
+ * Note: result must be freed after use.
+ */
+
+char *
+irc_server_string_tolower (struct t_irc_server *server, const char *string)
+{
+    char *result, *ptr_result;
+    int casemapping, range;
+
+    if (!string)
+        return NULL;
+
+    casemapping = (server) ? server->casemapping : -1;
+    if ((casemapping < 0) || (casemapping >= IRC_SERVER_NUM_CASEMAPPING))
+        casemapping = IRC_SERVER_CASEMAPPING_RFC1459;
+
+    range = irc_server_casemapping_range[casemapping];
+
+    result = strdup (string);
+    ptr_result = result;
+    while (ptr_result && ptr_result[0])
+    {
+        if ((ptr_result[0] >= 'A') && (ptr_result[0] < 'A' + range))
+            ptr_result[0] += ('a' - 'A');
+        ptr_result = (char *)weechat_utf8_next_char (ptr_result);
+    }
+
+    return result;
+}
+
+/*
+ * Converts string to upper case, following server casemapping.
+ *
+ * Note: result must be freed after use.
+ */
+
+char *
+irc_server_string_toupper (struct t_irc_server *server, const char *string)
+{
+    char *result, *ptr_result;
+    int casemapping, range;
+
+    if (!string)
+        return NULL;
+
+    casemapping = (server) ? server->casemapping : -1;
+    if ((casemapping < 0) || (casemapping >= IRC_SERVER_NUM_CASEMAPPING))
+        casemapping = IRC_SERVER_CASEMAPPING_RFC1459;
+
+    range = irc_server_casemapping_range[casemapping];
+
+    result = strdup (string);
+    ptr_result = result;
+    while (ptr_result && ptr_result[0])
+    {
+        if ((ptr_result[0] >= 'a') && (ptr_result[0] < 'a' + range))
+            ptr_result[0] -= ('a' - 'A');
+        ptr_result = (char *)weechat_utf8_next_char (ptr_result);
+    }
+
+    return result;
+}
+
 /*
  * Evaluates a string using the server as context:
  * ${irc_server.xxx} and ${server} are replaced by a server option and the
diff --git a/src/plugins/irc/irc-server.h b/src/plugins/irc/irc-server.h
index d34cb31d0..4ae647ed2 100644
--- a/src/plugins/irc/irc-server.h
+++ b/src/plugins/irc/irc-server.h
@@ -348,6 +348,10 @@ extern int irc_server_strcasecmp (struct t_irc_server *server,
 extern int irc_server_strncasecmp (struct t_irc_server *server,
                                    const char *string1, const char *string2,
                                    int max);
+extern char *irc_server_string_tolower (struct t_irc_server *server,
+                                        const char *string);
+extern char *irc_server_string_toupper (struct t_irc_server *server,
+                                        const char *string);
 extern char *irc_server_eval_expression (struct t_irc_server *server,
                                          const char *string);
 extern void irc_server_sasl_get_creds (struct t_irc_server *server,
-- 
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