bin/sh/parser.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)parser.h    8.3 (Berkeley) 5/4/95
  33  * $FreeBSD$
  34  */
  35
  36 /* control characters in argument strings */
  37 #define CTLESC '\300'
  38 #define CTLVAR '\301'
  39 #define CTLENDVAR '\371'
  40 #define CTLBACKQ '\372'
  41 #define CTLQUOTE 01             /* ored with CTLBACKQ code if in quotes */
  42 /*      CTLBACKQ | CTLQUOTE == '\373' */
  43 #define CTLARI  '\374'
  44 #define CTLENDARI '\375'
  45 #define CTLQUOTEMARK '\376'
  46 #define CTLQUOTEEND '\377' /* only for ${v+-...} */
  47
  48 /* variable substitution byte (follows CTLVAR) */
  49 #define VSTYPE          0x0f    /* type of variable substitution */
  50 #define VSNUL           0x10    /* colon--treat the empty string as unset */
  51 #define VSLINENO        0x20    /* expansion of $LINENO, the line number \
  52                                    follows immediately */
  53 #define VSQUOTE         0x80    /* inside double quotes--suppress splitting */
  54
  55 /* values of VSTYPE field */
  56 #define VSNORMAL        0x1             /* normal variable:  $var or ${var} */
  57 #define VSMINUS         0x2             /* ${var-text} */
  58 #define VSPLUS          0x3             /* ${var+text} */
  59 #define VSQUESTION      0x4             /* ${var?message} */
  60 #define VSASSIGN        0x5             /* ${var=text} */
  61 #define VSTRIMLEFT      0x6             /* ${var#pattern} */
  62 #define VSTRIMLEFTMAX   0x7             /* ${var##pattern} */
  63 #define VSTRIMRIGHT     0x8             /* ${var%pattern} */
  64 #define VSTRIMRIGHTMAX  0x9             /* ${var%%pattern} */
  65 #define VSLENGTH        0xa             /* ${#var} */
  66 #define VSERROR         0xb             /* Syntax error, issue when expanded */
  67
  68
  69 /*
  70  * NEOF is returned by parsecmd when it encounters an end of file.  It
  71  * must be distinct from NULL.
  72  */
  73 #define NEOF ((union node *)-1)
  74 extern int whichprompt;         /* 1 == PS1, 2 == PS2 */
  75 extern const char *const parsekwd[];
  76
  77
  78 union node *parsecmd(int);
  79 void forcealias(void);
  80 void fixredir(union node *, const char *, int);
  81 int goodname(const char *);
  82 int isassignment(const char *);
  83 char *getprompt(void *);
  84 const char *expandstr(const char *);