| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | *
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| 36 | * @(#)var.h 5.1 (Berkeley) 3/7/91
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| 37 | */
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| 38 |
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| 39 | /*
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| 40 | * Shell variables.
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| 41 | */
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| 42 |
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| 43 | /* flags */
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| 44 | #define VEXPORT 01 /* variable is exported */
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| 45 | #define VREADONLY 02 /* variable cannot be modified */
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| 46 | #define VSTRFIXED 04 /* variable struct is staticly allocated */
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| 47 | #define VTEXTFIXED 010 /* text is staticly allocated */
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| 48 | #define VSTACK 020 /* text is allocated on the stack */
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| 49 | #define VUNSET 040 /* the variable is not set */
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| 50 |
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| 51 |
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| 52 | struct var {
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| 53 | struct var *next; /* next entry in hash list */
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| 54 | int flags; /* flags are defined above */
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| 55 | char *text; /* name=value */
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| 56 | };
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| 57 |
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| 58 |
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| 59 | struct localvar {
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| 60 | struct localvar *next; /* next local variable in list */
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| 61 | struct var *vp; /* the variable that was made local */
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| 62 | int flags; /* saved flags */
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| 63 | char *text; /* saved text */
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| 64 | };
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| 65 |
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| 66 |
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| 67 | struct localvar *localvars;
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| 68 |
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| 69 | #if ATTY
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| 70 | extern struct var vatty;
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| 71 | #endif
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| 72 | extern struct var vifs;
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| 73 | extern struct var vmail;
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| 74 | extern struct var vmpath;
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| 75 | extern struct var vpath;
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| 76 | extern struct var vps1;
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| 77 | extern struct var vps2;
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| 78 | extern struct var vpse;
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| 79 | #if ATTY
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| 80 | extern struct var vterm;
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| 81 | #endif
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| 82 |
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| 83 | /*
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| 84 | * The following macros access the values of the above variables.
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| 85 | * They have to skip over the name. They return the null string
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| 86 | * for unset variables.
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| 87 | */
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| 88 |
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| 89 | #define ifsval() (vifs.text + 4)
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| 90 | #define mailval() (vmail.text + 5)
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| 91 | #define mpathval() (vmpath.text + 9)
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| 92 | #define pathval() (vpath.text + 5)
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| 93 | #define ps1val() (vps1.text + 4)
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| 94 | #define ps2val() (vps2.text + 4)
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| 95 | #define pseval() (vpse.text + 4)
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| 96 | #if ATTY
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| 97 | #define termval() (vterm.text + 5)
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| 98 | #endif
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| 99 |
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| 100 | #if ATTY
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| 101 | #define attyset() ((vatty.flags & VUNSET) == 0)
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| 102 | #endif
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| 103 | #define mpathset() ((vmpath.flags & VUNSET) == 0)
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| 104 |
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| 105 |
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| 106 | #ifdef __STDC__
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| 107 | void initvar();
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| 108 | void setvar(char *, char *, int);
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| 109 | void setvareq(char *, int);
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| 110 | struct strlist;
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| 111 | void listsetvar(struct strlist *);
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| 112 | char *lookupvar(char *);
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| 113 | char *bltinlookup(char *, int);
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| 114 | char **environment();
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| 115 | int showvarscmd(int, char **);
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| 116 | void mklocal(char *);
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| 117 | void poplocalvars(void);
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| 118 | #else
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| 119 | void initvar();
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| 120 | void setvar();
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| 121 | void setvareq();
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| 122 | void listsetvar();
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| 123 | char *lookupvar();
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| 124 | char *bltinlookup();
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| 125 | char **environment();
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| 126 | int showvarscmd();
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| 127 | void mklocal();
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| 128 | void poplocalvars();
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| 129 | #endif
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