vde-2/include/cmdparse.h

   1 /*
   2  * Copyright (C) 2007 - Renzo Davoli, Luca Bigliardi
   3  * This program is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU General Public License
   5  * as published by the Free Software Foundation; either version 2
   6  * of the License, or (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  16  */
  17
  18 /**
  19  * @file cmdparse.h
  20  * @brief finite state automata for communication and parsing
  21  * @author Renzo Davoli, Luca Bigliardi
  22  * @date 2007-05-17
  23  */
  24
  25 #ifndef _CMDPARSE_H_
  26 #define _CMDPARSE_H_
  27
  28 /** A state of automata */
  29 struct utmstate;
  30
  31 /** Automata */
  32 struct utm {
  33         struct utmstate *head;
  34         int timeout;
  35 };
  36
  37 /** Automata buffer containing data read but not parsed yet.
  38  * State machine has finished to chomp whole parse buffer
  39  * when pos == len
  40  */
  41 struct utm_buf {
  42         char *buf;
  43         int len;
  44         int pos;
  45 };
  46
  47 /** Automata output.
  48  * In a parse machine is possible to build a list of outputs,
  49  * each element can be tagged.
  50  */
  51 struct utm_out {
  52         char *buf;
  53         size_t sz;
  54         int tag;
  55         struct utm_out *next;
  56 };
  57
  58 /**
  59  * @brief utmout_alloc - create an empty automata output buffer
  60  *
  61  * @return pointer to the empty buffer, NULL if error
  62  */
  63 struct utm_out *utmout_alloc(void);
  64
  65 /**
  66  * @brief utmout_free - safe destroy output buffer list
  67  *
  68  * @param out automata output buffer list to free
  69  */
  70 void utmout_free(struct utm_out *out);
  71
  72 /**
  73  * @brief utm_alloc - create finite state automata
  74  *
  75  * @param conf configuration file containing the list of states
  76  *
  77  * @return finite state automata on success, NULL on error
  78  */
  79 struct utm *utm_alloc(char *conf);
  80
  81 /**
  82  * @brief utm_free - free finite state automata structure
  83  *
  84  * @param utm finite state automata to destroy
  85  */
  86 void utm_free(struct utm *utm);
  87
  88 /**
  89  * @brief utm_run
  90  *
  91  * @param utm finite state automata
  92  * @param buf automata buffer (related to fd)
  93  * @param fd file descriptor to read and write to
  94  * @param argc number of arguments in argv
  95  * @param argv NULL terminated list of arguments
  96  * @param out output buffer of machine
  97  * @param debug run machine in verbose mode
  98  *
  99  * @return exit value of machine, it depends to configuration
 100  */
 101 int utm_run(struct utm *utm, struct utm_buf *buf, int fd, int argc, char **argv, struct utm_out *out, int debug);
 102
 103 #endif