128 lines
4.6 KiB
C
128 lines
4.6 KiB
C
/*
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* charybdis - an advanced ircd.
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* Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CHARYBDIS__MSGBUF_H
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#define CHARYBDIS__MSGBUF_H
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#define MAXPARA (15)
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/* a key-value structure for each message tag. */
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struct MsgTag {
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const char *key; /* the key of the tag (must be set) */
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const char *value; /* the value of the tag or NULL */
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unsigned int capmask; /* the capability mask this tag belongs to (used only when sending) */
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};
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struct MsgBuf {
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size_t n_tags; /* the number of tags in the MsgBuf */
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struct MsgTag tags[MAXPARA]; /* the tags themselves, upto MAXPARA tags available */
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const char *origin; /* the origin of the message (or NULL) */
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const char *target; /* the target of the message (either NULL, or custom defined) */
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const char *cmd; /* the cmd/verb of the message (either NULL, or para[0]) */
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char *endp; /* one past the end of the original array */
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size_t n_para; /* the number of parameters (always at least 1 if a full message) */
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const char *para[MAXPARA]; /* parameters vector (starting with cmd as para[0]) */
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};
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struct MsgBuf_str_data {
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const struct MsgBuf *msgbuf;
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unsigned int caps;
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};
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#define MSGBUF_CACHE_SIZE 32
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struct MsgBuf_cache_entry {
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unsigned int caps;
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buf_head_t linebuf;
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struct MsgBuf_cache_entry *next;
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};
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struct MsgBuf_cache {
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const struct MsgBuf *msgbuf;
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char message[DATALEN + 1];
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unsigned int overall_capmask;
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/* Fixed maximum size linked list, new entries are allocated at the end
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* of the array but are accessed through the "next" pointers.
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*
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* This does not use rb dlink to avoid unnecessary individual allocations.
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*/
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struct MsgBuf_cache_entry entry[MSGBUF_CACHE_SIZE];
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struct MsgBuf_cache_entry *head; /* LRU cache head */
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};
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/*
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* parse a message into a MsgBuf.
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* returns 0 on success, 1 on error.
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*/
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int msgbuf_parse(struct MsgBuf *msgbuf, char *line);
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/*
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* Unparse the tail of a msgbuf perfectly, preserving framing details
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* msgbuf->para[n] will reach to the end of the line
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*/
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void msgbuf_reconstruct_tail(struct MsgBuf *msgbuf, size_t n);
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/*
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* unparse a pure MsgBuf into a buffer.
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* if origin is NULL, me.name will be used.
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* cmd may not be NULL.
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* returns 0 on success, 1 on error.
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*/
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int msgbuf_unparse(char *buf, size_t buflen, const struct MsgBuf *msgbuf, unsigned int capmask);
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/*
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* unparse a MsgBuf header plus payload into a buffer.
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* if origin is NULL, me.name will be used.
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* cmd may not be NULL.
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* returns 0 on success, 1 on error.
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*/
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int msgbuf_unparse_fmt(char *buf, size_t buflen, const struct MsgBuf *head, unsigned int capmask, const char *fmt, ...) AFP(5, 6);
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int msgbuf_vunparse_fmt(char *buf, size_t buflen, const struct MsgBuf *head, unsigned int capmask, const char *fmt, va_list va);
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int msgbuf_unparse_linebuf_tags(char *buf, size_t buflen, void *data);
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int msgbuf_unparse_prefix(char *buf, size_t *buflen, const struct MsgBuf *msgbuf, unsigned int capmask);
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void msgbuf_cache_init(struct MsgBuf_cache *cache, const struct MsgBuf *msgbuf, const rb_strf_t *message);
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void msgbuf_cache_initf(struct MsgBuf_cache *cache, const struct MsgBuf *msgbuf, const rb_strf_t *message, const char *format, ...) AFP(4, 5);
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buf_head_t *msgbuf_cache_get(struct MsgBuf_cache *cache, unsigned int caps);
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void msgbuf_cache_free(struct MsgBuf_cache *cache);
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static inline void
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msgbuf_init(struct MsgBuf *msgbuf)
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{
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memset(msgbuf, 0, sizeof(*msgbuf));
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}
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static inline void
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msgbuf_append_tag(struct MsgBuf *msgbuf, const char *key, const char *value, unsigned int capmask)
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{
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if (msgbuf->n_tags < MAXPARA) {
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msgbuf->tags[msgbuf->n_tags].key = key;
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msgbuf->tags[msgbuf->n_tags].value = value;
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msgbuf->tags[msgbuf->n_tags].capmask = capmask;
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msgbuf->n_tags++;
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}
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}
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#endif
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