third_party/mach_override/libudis86/input.h

   1 /* udis86 - libudis86/input.h
   2  *
   3  * Copyright (c) 2002-2009 Vivek Thampi
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without modification,
   7  * are permitted provided that the following conditions are met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright notice,
  10  *       this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above copyright notice,
  12  *       this list of conditions and the following disclaimer in the documentation
  13  *       and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
  19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  22  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 #ifndef UD_INPUT_H
  27 #define UD_INPUT_H
  28
  29 #include "types.h"
  30 #include "udint.h"
  31
  32 uint8_t ud_inp_next(struct ud* u);
  33
  34 /*
  35  * inp_start
  36  *    Should be called before each de-code operation.
  37  */
  38 static inline void
  39 inp_start(struct ud *u)
  40 {
  41   u->inp_ctr = 0;
  42 }
  43
  44 /* inp_reset
  45  *    Resets the current pointer to its position before the current
  46  *    instruction disassembly was started.
  47  */
  48 static inline void
  49 inp_reset(struct ud *u)
  50 {
  51   u->inp_curr -= u->inp_ctr;
  52   u->inp_ctr   = 0;
  53 }
  54
  55 /* inp_sess
  56  *    Returns the pointer to current session.
  57  */
  58 static inline uint8_t*
  59 inp_sess(struct ud *u)
  60 {
  61   return u->inp_sess;
  62 }
  63
  64 /*
  65  * inp_curr
  66  *    Returns the current input byte.
  67  */
  68 static inline uint8_t
  69 inp_curr(const struct ud *u)
  70 {
  71   return u->inp_cache[u->inp_curr];
  72 }
  73
  74 /*
  75  * inp_back
  76  *    Move back a single byte in the stream.
  77  */
  78 static inline void
  79 inp_back(struct ud* u)
  80 {
  81   if (u->inp_ctr > 0) {
  82     --u->inp_curr;
  83     --u->inp_ctr;
  84   }
  85 }
  86
  87 /*
  88  * inp_peek
  89  *    Peek next byte in input.
  90  */
  91 static inline uint8_t
  92 inp_peek(struct ud* u)
  93 {
  94   uint8_t r = ud_inp_next(u);
  95   if (!u->error) {
  96       inp_back(u); /* Don't backup if there was an error */
  97   }
  98   return r;
  99 }
 100
 101
 102 /*
 103  * inp_len
 104  *    Returns the number of bytes input in the current
 105  *    session.
 106  */
 107 static inline size_t
 108 inp_len(const struct ud *u)
 109 {
 110   return u->inp_ctr;
 111 }
 112
 113 #endif /* UD_INPUT_H */
 114 /*
 115 vim: set ts=2 sw=2 expandtab
 116 */