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