add fishlim plugin

plugins/fishlim/irc.c

@@ -0,0 +1,112 @@
+/*
+
+  Copyright (c) 2010 Samuel Lidén Borell <samuel@slbdata.se>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+
+*/
+
+#include <stdlib.h>
+#include <string.h>
+#include "irc.h"
+
+/**
+ * Parses an IRC message. The words array should contain the message splitted
+ * at spaces. The prefix and command is extracted from the message, and
+ * parameters_offset is set to the index of the first parameter.
+ */
+bool irc_parse_message(const char *words[],
+                       const char **prefix, const char **command,
+                       size_t *parameters_offset) {
+    size_t w = 1;
+    if (prefix) *prefix = NULL;
+    if (command) *command = NULL;
+    
+    // See if the message starts with a prefix (sender user)
+    if (words[w][0] == ':') {
+        if (prefix) *prefix = &words[w][1];
+        w++;
+    }
+    
+    // Check command
+    if (words[w][0] == '\0') return false;
+    if (command) *command = words[w];
+    w++;
+    
+    *parameters_offset = w;
+    return true;
+}
+
+
+/**
+ * Finds the nick part of a "IRC prefix", which can have any
+ * of the following forms:
+ *
+ *     nick
+ *     nick@host
+ *     nick!ident
+ *     nick!ident@host
+ */
+char *irc_prefix_get_nick(const char *prefix) {
+    const char *end;
+    char *nick;
+    size_t length;
+    
+    if (!prefix) return NULL;
+    
+    // Find end of nick
+    end = prefix;
+    while (*end != '\0' && *end != '!' && *end != '@') end++;
+    
+    // Allocate string
+    length = end - prefix;
+    nick = malloc(length+1);
+    if (!nick) return NULL;
+    
+    // Copy to string
+    memcpy(nick, prefix, length);
+    nick[length] = '\0';
+    return nick;
+}
+
+
+/**
+ * Compares two nick names. Return 0 if equal. Otherwise the return value is
+ * less than zero if a is less than b or greater than zero if a is greater
+ * than b.
+ */
+int irc_nick_cmp(const char *a, const char *b) {
+    char ac;
+    char bc;
+    char diff;
+    for (;;) {
+        ac = *(a++);
+        bc = *(b++);
+        
+        // Change into IRC uppercase (see RFC 2812 section 2.2)
+        if (ac >= 'a' && ac <= '~') ac &= ~0x20;
+        if (bc >= 'a' && bc <= '~') bc &= ~0x20;
+        
+        diff = ac - bc;
+        if (diff) return diff;
+        if (!ac) return 0;
+    }
+}
+
+