commands/ash/var.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  * 4. 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  *      @(#)var.h       8.2 (Berkeley) 5/4/95
  33  * $FreeBSD: src/bin/sh/var.h,v 1.12 2004/04/06 20:06:51 markm Exp $
  34  */
  35
  36 /*
  37  * Shell variables.
  38  */
  39
  40 /* flags */
  41 #define VEXPORT         0x01    /* variable is exported */
  42 #define VREADONLY       0x02    /* variable cannot be modified */
  43 #define VSTRFIXED       0x04    /* variable struct is staticly allocated */
  44 #define VTEXTFIXED      0x08    /* text is staticly allocated */
  45 #define VSTACK          0x10    /* text is allocated on the stack */
  46 #define VUNSET          0x20    /* the variable is not set */
  47 #define VNOFUNC         0x40    /* don't call the callback function */
  48
  49
  50 struct var {
  51         struct var *next;               /* next entry in hash list */
  52         int flags;                      /* flags are defined above */
  53         char *text;                     /* name=value */
  54         void (*func)(const char *);
  55                                         /* function to be called when  */
  56                                         /* the variable gets set/unset */
  57 };
  58
  59
  60 struct localvar {
  61         struct localvar *next;          /* next local variable in list */
  62         struct var *vp;                 /* the variable that was made local */
  63         int flags;                      /* saved flags */
  64         char *text;                     /* saved text */
  65 };
  66
  67
  68 struct localvar *localvars;
  69
  70 extern struct var vifs;
  71 extern struct var vmail;
  72 extern struct var vmpath;
  73 extern struct var vpath;
  74 extern struct var vppid;
  75 extern struct var vps1;
  76 extern struct var vps2;
  77 extern struct var vpse;
  78 #ifndef NO_HISTORY
  79 extern struct var vhistsize;
  80 #endif
  81
  82 /*
  83  * The following macros access the values of the above variables.
  84  * They have to skip over the name.  They return the null string
  85  * for unset variables.
  86  */
  87
  88 #define ifsval()        (vifs.text + 4)
  89 #define ifsset()        ((vifs.flags & VUNSET) == 0)
  90 #define mailval()       (vmail.text + 5)
  91 #define mpathval()      (vmpath.text + 9)
  92 #define pathval()       (vpath.text + 5)
  93 #define ps1val()        (vps1.text + 4)
  94 #define ps2val()        (vps2.text + 4)
  95 #define pseval()        (vpse.text + 4)
  96 #define optindval()     (voptind.text + 7)
  97 #ifndef NO_HISTORY
  98 #define histsizeval()   (vhistsize.text + 9)
  99 #endif
 100
 101 #define mpathset()      ((vmpath.flags & VUNSET) == 0)
 102
 103 void initvar(void);
 104 void setvar(char *, char *, int);
 105 void setvareq(char *, int);
 106 struct strlist;
 107 void listsetvar(struct strlist *);
 108 char *lookupvar(char *);
 109 char *bltinlookup(char *, int);
 110 char **environment(void);
 111 void shprocvar(void);
 112 int showvarscmd(int, char **);
 113 int exportcmd(int, char **);
 114 int localcmd(int, char **);
 115 void mklocal(char *);
 116 void poplocalvars(void);
 117 int setvarcmd(int, char **);
 118 int unsetcmd(int, char **);
 119 int unsetvar(char *);
 120 int setvarsafe(char *, char *, int);
 121
 122 /*
 123  * $PchId: var.h,v 1.4 2006/03/29 12:04:45 philip Exp $
 124  */