src/shell.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1997-2005
   5  *      Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Kenneth Almquist.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      @(#)shell.h     8.2 (Berkeley) 5/4/95
  35  */
  36
  37 /*
  38  * The follow should be set to reflect the type of system you have:
  39  *      JOBS -> 1 if you have Berkeley job control, 0 otherwise.
  40  *      SHORTNAMES -> 1 if your linker cannot handle long names.
  41  *      define BSD if you are running 4.2 BSD or later.
  42  *      define SYSV if you are running under System V.
  43  *      define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
  44  *      define DEBUG=2 to compile in and turn on debugging.
  45  *      define DO_SHAREDVFORK to indicate that vfork(2) shares its address
  46  *             with its parent.
  47  *
  48  * When debugging is on, debugging info will be written to ./trace and
  49  * a quit signal will generate a core dump.
  50  */
  51
  52 #include <sys/param.h>
  53
  54 #ifndef JOBS
  55 #define JOBS 1
  56 #endif
  57 #ifndef BSD
  58 #define BSD 1
  59 #endif
  60
  61 #ifndef DO_SHAREDVFORK
  62 #if __NetBSD_Version__ >= 104000000
  63 #define DO_SHAREDVFORK
  64 #endif
  65 #endif
  66
  67 typedef void *pointer;
  68 #ifndef NULL
  69 #define NULL (void *)0
  70 #endif
  71 #define STATIC static
  72 #define MKINIT  /* empty */
  73
  74 extern char nullstr[1];         /* null string */
  75
  76
  77 #ifdef DEBUG
  78 #define TRACE(param)    trace param
  79 #define TRACEV(param)   tracev param
  80 #else
  81 #define TRACE(param)
  82 #define TRACEV(param)
  83 #endif
  84
  85 #if defined(__GNUC__) && __GNUC__ < 3
  86 #define va_copy __va_copy
  87 #endif
  88
  89 #if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
  90 #define __builtin_expect(x, expected_value) (x)
  91 #endif
  92
  93 #define likely(x)       __builtin_expect(!!(x),1)
  94 #define unlikely(x)     __builtin_expect(!!(x),0)
  95
  96 /*
  97  * Hack to calculate maximum length.
  98  * (length * 8 - 1) * log10(2) + 1 + 1 + 12
  99  * The second 1 is for the minus sign and the 12 is a safety margin.
 100  */
 101 static inline int max_int_length(int bytes)
 102 {
 103         return (bytes * 8 - 1) * 0.30102999566398119521 + 14;
 104 }