include/msgbuf.h

   1 /*
   2  * charybdis - an advanced ircd.
   3  * Copyright (c) 2016 William Pitcock <nenolod@dereferenced.org>.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice is present in all copies.
   8  *
   9  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  10  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  11  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  12  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  13  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  14  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  15  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  16  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  17  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  18  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  19  * POSSIBILITY OF SUCH DAMAGE.
  20  */
  21
  22 #include "s_assert.h"
  23
  24 #ifndef CHARYBDIS__MSGBUF_H
  25 #define CHARYBDIS__MSGBUF_H
  26
  27 #define MAXPARA         (15)
  28
  29 /* a key-value structure for each message tag. */
  30 struct MsgTag {
  31         const char *key;                /* the key of the tag (must be set) */
  32         const char *value;              /* the value of the tag or NULL */
  33         unsigned int capmask;           /* the capability mask this tag belongs to (used only when sending) */
  34 };
  35
  36 struct MsgBuf {
  37         size_t n_tags;                  /* the number of tags in the MsgBuf */
  38         struct MsgTag tags[MAXPARA];    /* the tags themselves, upto MAXPARA tags available */
  39
  40         const char *origin;             /* the origin of the message (or NULL) */
  41         const char *cmd;                /* the cmd/verb of the message (also para[0]) */
  42
  43         size_t parselen;                /* the length of the message */
  44         size_t n_para;                  /* the number of parameters (always at least 1) */
  45         const char *para[MAXPARA];      /* parameters vector (starting with cmd as para[0]) */
  46 };
  47
  48 /*
  49  * parse a message into a MsgBuf.
  50  * returns 0 on success, 1 on error.
  51  */
  52 int msgbuf_parse(struct MsgBuf *msgbuf, char *line);
  53
  54 /*
  55  * unparse a pure MsgBuf into a buffer.
  56  * if origin is NULL, me.name will be used.
  57  * cmd may not be NULL.
  58  * returns 0 on success, 1 on error.
  59  */
  60 int msgbuf_unparse(char *buf, size_t buflen, struct MsgBuf *msgbuf, unsigned int capmask);
  61
  62 /*
  63  * unparse a MsgBuf header plus payload into a buffer.
  64  * if origin is NULL, me.name will be used.
  65  * cmd may not be NULL.
  66  * returns 0 on success, 1 on error.
  67  */
  68 int msgbuf_unparse_fmt(char *buf, size_t buflen, struct MsgBuf *head, unsigned int capmask, const char *fmt, ...) AFP(5, 6);
  69 int msgbuf_vunparse_fmt(char *buf, size_t buflen, struct MsgBuf *head, unsigned int capmask, const char *fmt, va_list va);
  70
  71 void msgbuf_unparse_prefix(char *buf, size_t buflen, struct MsgBuf *msgbuf, unsigned int capmask);
  72
  73 static inline void
  74 msgbuf_init(struct MsgBuf *msgbuf)
  75 {
  76         memset(msgbuf, 0, sizeof(*msgbuf));
  77 }
  78
  79 static inline void
  80 msgbuf_append_tag(struct MsgBuf *msgbuf, const char *key, const char *value, unsigned int capmask)
  81 {
  82         s_assert(msgbuf->n_tags < MAXPARA);
  83
  84         msgbuf->tags[msgbuf->n_tags].key = key;
  85         msgbuf->tags[msgbuf->n_tags].value = value;
  86         msgbuf->tags[msgbuf->n_tags].capmask = capmask;
  87         msgbuf->n_tags++;
  88 }
  89
  90 static inline void
  91 msgbuf_append_para(struct MsgBuf *msgbuf, const char *para)
  92 {
  93         s_assert(msgbuf->n_para < MAXPARA);
  94
  95         msgbuf->para[msgbuf->n_para] = para;
  96         msgbuf->n_para++;
  97 }
  98
  99 #endif