gcc/system.h

   1 /* system.h - Get common system includes and various definitions and
   2    declarations based on autoconf macros.
   3    Copyright (C) 1998 Free Software Foundation, Inc.
   4
   5  */
   6
   7 #ifndef __GCC_SYSTEM_H__
   8 #define __GCC_SYSTEM_H__
   9
  10 #include <stdio.h>
  11 #include <ctype.h>
  12
  13 /* Jim Meyering writes:
  14
  15    "... Some ctype macros are valid only for character codes that
  16    isascii says are ASCII (SGI's IRIX-4.0.5 is one such system --when
  17    using /bin/cc or gcc but without giving an ansi option).  So, all
  18    ctype uses should be through macros like ISPRINT...  If
  19    STDC_HEADERS is defined, then autoconf has verified that the ctype
  20    macros don't need to be guarded with references to isascii. ...
  21    Defining isascii to 1 should let any compiler worth its salt
  22    eliminate the && through constant folding."
  23
  24    Bruno Haible adds:
  25
  26    "... Furthermore, isupper(c) etc. have an undefined result if c is
  27    outside the range -1 <= c <= 255. One is tempted to write isupper(c)
  28    with c being of type `char', but this is wrong if c is an 8-bit
  29    character >= 128 which gets sign-extended to a negative value.
  30    The macro ISUPPER protects against this as well."  */
  31
  32 #if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
  33 # define IN_CTYPE_DOMAIN(c) 1
  34 #else
  35 # define IN_CTYPE_DOMAIN(c) isascii(c)
  36 #endif
  37
  38 #ifdef isblank
  39 # define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
  40 #else
  41 # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
  42 #endif
  43 #ifdef isgraph
  44 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
  45 #else
  46 # define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))
  47 #endif
  48
  49 #define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
  50 #define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))
  51 #define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
  52 #define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
  53 #define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
  54 #define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))
  55 #define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
  56 #define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
  57 #define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
  58 #define ISDIGIT_LOCALE(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
  59
  60 /* ISDIGIT differs from ISDIGIT_LOCALE, as follows:
  61    - Its arg may be any int or unsigned int; it need not be an unsigned char.
  62    - It's guaranteed to evaluate its argument exactly once.
  63    - It's typically faster.
  64    Posix 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
  65    only '0' through '9' are digits.  Prefer ISDIGIT to ISDIGIT_LOCALE unless
  66    it's important to use the locale's definition of `digit' even when the
  67    host does not conform to Posix.  */
  68 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
  69
  70
  71 #include <sys/types.h>
  72 #include <errno.h>
  73
  74 #ifndef errno
  75 extern int errno;
  76 #endif
  77
  78 #ifdef HAVE_STRING_H
  79 # include <string.h>
  80 #else
  81 # ifdef HAVE_STRINGS_H
  82 #  include <strings.h>
  83 # endif
  84 #endif
  85
  86 #ifdef HAVE_STDLIB_H
  87 # include <stdlib.h>
  88 #endif
  89
  90 #ifdef HAVE_UNISTD_H
  91 # include <unistd.h>
  92 #endif
  93
  94 #ifdef HAVE_SYS_PARAM_H
  95 # include <sys/param.h>
  96 #endif
  97
  98 #if HAVE_LIMITS_H
  99 # include <limits.h>
 100 #endif
 101
 102 #ifdef TIME_WITH_SYS_TIME
 103 # include <sys/time.h>
 104 # include <time.h>
 105 #else
 106 # if HAVE_SYS_TIME_H
 107 # include <sys/time.h>
 108 # else
 109 #  include <time.h>
 110 #endif
 111 #endif
 112
 113 #ifdef HAVE_FCNTL_H
 114 # include <fcntl.h>
 115 #else
 116 # include <sys/file.h>
 117 #endif
 118
 119 #ifndef SEEK_SET
 120 # define SEEK_SET 0
 121 # define SEEK_CUR 1
 122 # define SEEK_END 2
 123 #endif
 124 #ifndef F_OK
 125 # define F_OK 0
 126 # define X_OK 1
 127 # define W_OK 2
 128 # define R_OK 4
 129 #endif
 130
 131
 132
 133 #ifndef bcopy
 134 # ifdef HAVE_BCOPY
 135 #  ifdef NEED_DECLARATION_BCOPY
 136 extern void bcopy ();
 137 #  endif
 138 # else /* ! HAVE_BCOPY */
 139 #  define bcopy(src,dst,len) memcpy ((dst),(src),(len))
 140 # endif
 141 #endif
 142
 143 #ifndef bcmp
 144 # ifdef HAVE_BCMP
 145 #  ifdef NEED_DECLARATION_BCMP
 146 extern int bcmp ();
 147 #  endif
 148 # else /* ! HAVE_BCMP */
 149 #  define bcmp(left,right,len) memcmp ((left),(right),(len))
 150 # endif
 151 #endif
 152
 153 #ifndef bzero
 154 # ifdef HAVE_BZERO
 155 #  ifdef NEED_DECLARATION_BZERO
 156 extern void bzero ();
 157 #  endif
 158 # else /* ! HAVE_BZERO */
 159 #  define bzero(dst,len) memset ((dst),0,(len))
 160 # endif
 161 #endif
 162
 163 #ifndef index
 164 # ifdef HAVE_INDEX
 165 #  ifdef NEED_DECLARATION_INDEX
 166 extern char *index ();
 167 #  endif
 168 # else /* ! HAVE_INDEX */
 169 #  define index strchr
 170 # endif
 171 #endif
 172
 173 #ifndef rindex
 174 # ifdef HAVE_RINDEX
 175 #  ifdef NEED_DECLARATION_RINDEX
 176 extern char *rindex ();
 177 #  endif
 178 # else /* ! HAVE_RINDEX */
 179 #  define rindex strrchr
 180 # endif
 181 #endif
 182
 183 #ifdef NEED_DECLARATION_FREE
 184 extern void free ();
 185 #endif
 186
 187 #ifdef NEED_DECLARATION_GETENV
 188 extern char *getenv ();
 189 #endif
 190
 191 #endif /* __GCC_SYSTEM_H__ */