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/*
* common.c: common functionality
*
* Copyright (c) 2014, Přemysl Janouch <p.janouch@gmail.com>
* All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#define LIBERTY_WANT_SSL
#define LIBERTY_WANT_POLLER
#define print_fatal_data ((void *) LOG_ERR)
#define print_error_data ((void *) LOG_ERR)
#define print_warning_data ((void *) LOG_WARNING)
#define print_status_data ((void *) LOG_INFO)
#define print_debug_data ((void *) LOG_DEBUG)
#include "liberty/liberty.c"
// --- Logging -----------------------------------------------------------------
static void
log_message_syslog (void *user_data, const char *quote, const char *fmt,
va_list ap)
{
int prio = (int) (intptr_t) user_data;
va_list va;
va_copy (va, ap);
int size = vsnprintf (NULL, 0, fmt, va);
va_end (va);
if (size < 0)
return;
char buf[size + 1];
if (vsnprintf (buf, sizeof buf, fmt, ap) >= 0)
syslog (prio, "%s%s", quote, buf);
}
// --- IRC utilities -----------------------------------------------------------
struct irc_message
{
struct str_map tags; ///< IRC 3.2 message tags
char *prefix; ///< Message prefix
char *command; ///< IRC command
struct str_vector params; ///< Command parameters
};
static void
irc_parse_message_tags (const char *tags, struct str_map *out)
{
struct str_vector v;
str_vector_init (&v);
split_str_ignore_empty (tags, ';', &v);
for (size_t i = 0; i < v.len; i++)
{
char *key = v.vector[i], *equal_sign = strchr (key, '=');
if (equal_sign)
{
*equal_sign = '\0';
str_map_set (out, key, xstrdup (equal_sign + 1));
}
else
str_map_set (out, key, xstrdup (""));
}
str_vector_free (&v);
}
static void
irc_parse_message (struct irc_message *msg, const char *line)
{
str_map_init (&msg->tags);
msg->tags.free = free;
msg->prefix = NULL;
msg->command = NULL;
str_vector_init (&msg->params);
// IRC 3.2 message tags
if (*line == '@')
{
size_t tags_len = strcspn (++line, " ");
char *tags = xstrndup (line, tags_len);
irc_parse_message_tags (tags, &msg->tags);
free (tags);
line += tags_len;
while (*line == ' ')
line++;
}
// Prefix
if (*line == ':')
{
size_t prefix_len = strcspn (++line, " ");
msg->prefix = xstrndup (line, prefix_len);
line += prefix_len;
}
// Command name
{
while (*line == ' ')
line++;
size_t cmd_len = strcspn (line, " ");
msg->command = xstrndup (line, cmd_len);
line += cmd_len;
}
// Arguments
while (true)
{
while (*line == ' ')
line++;
if (*line == ':')
{
str_vector_add (&msg->params, ++line);
break;
}
size_t param_len = strcspn (line, " ");
if (!param_len)
break;
str_vector_add_owned (&msg->params, xstrndup (line, param_len));
line += param_len;
}
}
static void
irc_free_message (struct irc_message *msg)
{
str_map_free (&msg->tags);
free (msg->prefix);
free (msg->command);
str_vector_free (&msg->params);
}
static void
irc_process_buffer (struct str *buf,
void (*callback)(const struct irc_message *, const char *, void *),
void *user_data)
{
char *start = buf->str, *end = start + buf->len;
for (char *p = start; p + 1 < end; p++)
{
// Split the input on newlines
if (p[0] != '\r' || p[1] != '\n')
continue;
*p = 0;
struct irc_message msg;
irc_parse_message (&msg, start);
callback (&msg, start, user_data);
irc_free_message (&msg);
start = p + 2;
}
// XXX: we might want to just advance some kind of an offset to avoid
// moving memory around unnecessarily.
str_remove_slice (buf, 0, start - buf->str);
}
static int
irc_tolower (int c)
{
if (c == '[') return '{';
if (c == ']') return '}';
if (c == '\\') return '|';
if (c == '~') return '^';
return c >= 'A' && c <= 'Z' ? c + ('a' - 'A') : c;
}
static size_t
irc_strxfrm (char *dest, const char *src, size_t n)
{
size_t len = strlen (src);
while (n-- && (*dest++ = irc_tolower (*src++)))
;
return len;
}
static int
irc_strcmp (const char *a, const char *b)
{
int x;
while (*a || *b)
if ((x = irc_tolower (*a++) - irc_tolower (*b++)))
return x;
return 0;
}
static int
irc_fnmatch (const char *pattern, const char *string)
{
size_t pattern_size = strlen (pattern) + 1;
size_t string_size = strlen (string) + 1;
char x_pattern[pattern_size], x_string[string_size];
irc_strxfrm (x_pattern, pattern, pattern_size);
irc_strxfrm (x_string, string, string_size);
return fnmatch (x_pattern, x_string, 0);
}
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