bin/sh/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  * 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  *      @(#)var.h       8.2 (Berkeley) 5/4/95
  33  * $FreeBSD$
  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 statically allocated */
  44 #define VTEXTFIXED      0x08    /* text is statically 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 #define VNOSET          0x80    /* do not set variable - just readonly test */
  49 #define VNOLOCAL        0x100   /* ignore forcelocal */
  50
  51
  52 struct var {
  53         struct var *next;               /* next entry in hash list */
  54         int flags;                      /* flags are defined above */
  55         int name_len;                   /* length of name */
  56         char *text;                     /* name=value */
  57         void (*func)(const char *);
  58                                         /* function to be called when  */
  59                                         /* the variable gets set/unset */
  60 };
  61
  62
  63 struct localvar {
  64         struct localvar *next;          /* next local variable in list */
  65         struct var *vp;                 /* the variable that was made local */
  66         int flags;                      /* saved flags */
  67         char *text;                     /* saved text */
  68 };
  69
  70
  71 extern struct localvar *localvars;
  72 extern int forcelocal;
  73
  74 extern struct var vifs;
  75 extern struct var vmail;
  76 extern struct var vmpath;
  77 extern struct var vpath;
  78 extern struct var vps1;
  79 extern struct var vps2;
  80 extern struct var vps4;
  81 extern struct var vdisvfork;
  82 #ifndef NO_HISTORY
  83 extern struct var vhistsize;
  84 extern struct var vterm;
  85 #endif
  86
  87 extern int localeisutf8;
  88 /* The parser uses the locale that was in effect at startup. */
  89 extern int initial_localeisutf8;
  90
  91 /*
  92  * The following macros access the values of the above variables.
  93  * They have to skip over the name.  They return the null string
  94  * for unset variables.
  95  */
  96
  97 #define ifsval()        (vifs.text + 4)
  98 #define ifsset()        ((vifs.flags & VUNSET) == 0)
  99 #define mailval()       (vmail.text + 5)
 100 #define mpathval()      (vmpath.text + 9)
 101 #define pathval()       (vpath.text + 5)
 102 #define ps1val()        (vps1.text + 4)
 103 #define ps2val()        (vps2.text + 4)
 104 #define ps4val()        (vps4.text + 4)
 105 #define optindval()     (voptind.text + 7)
 106 #ifndef NO_HISTORY
 107 #define histsizeval()   (vhistsize.text + 9)
 108 #define termval()       (vterm.text + 5)
 109 #endif
 110
 111 #define mpathset()      ((vmpath.flags & VUNSET) == 0)
 112 #define disvforkset()   ((vdisvfork.flags & VUNSET) == 0)
 113
 114 void initvar(void);
 115 void setvar(const char *, const char *, int);
 116 void setvareq(char *, int);
 117 struct strlist;
 118 void listsetvar(struct strlist *, int);
 119 char *lookupvar(const char *);
 120 char *bltinlookup(const char *, int);
 121 void bltinsetlocale(void);
 122 void bltinunsetlocale(void);
 123 void updatecharset(void);
 124 void initcharset(void);
 125 char **environment(void);
 126 int showvarscmd(int, char **);
 127 void mklocal(char *);
 128 void poplocalvars(void);
 129 int unsetvar(const char *);
 130 int setvarsafe(const char *, const char *, int);