1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Kenneth Almquist. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)var.h 5.1 (Berkeley) 03/07/91 11 */ 12 13 /* 14 * Shell variables. 15 */ 16 17 /* flags */ 18 #define VEXPORT 01 /* variable is exported */ 19 #define VREADONLY 02 /* variable cannot be modified */ 20 #define VSTRFIXED 04 /* variable struct is staticly allocated */ 21 #define VTEXTFIXED 010 /* text is staticly allocated */ 22 #define VSTACK 020 /* text is allocated on the stack */ 23 #define VUNSET 040 /* the variable is not set */ 24 25 26 struct var { 27 struct var *next; /* next entry in hash list */ 28 int flags; /* flags are defined above */ 29 char *text; /* name=value */ 30 }; 31 32 33 struct localvar { 34 struct localvar *next; /* next local variable in list */ 35 struct var *vp; /* the variable that was made local */ 36 int flags; /* saved flags */ 37 char *text; /* saved text */ 38 }; 39 40 41 struct localvar *localvars; 42 43 #if ATTY 44 extern struct var vatty; 45 #endif 46 extern struct var vifs; 47 extern struct var vmail; 48 extern struct var vmpath; 49 extern struct var vpath; 50 extern struct var vps1; 51 extern struct var vps2; 52 #if ATTY 53 extern struct var vterm; 54 #endif 55 56 /* 57 * The following macros access the values of the above variables. 58 * They have to skip over the name. They return the null string 59 * for unset variables. 60 */ 61 62 #define ifsval() (vifs.text + 4) 63 #define mailval() (vmail.text + 5) 64 #define mpathval() (vmpath.text + 9) 65 #define pathval() (vpath.text + 5) 66 #define ps1val() (vps1.text + 4) 67 #define ps2val() (vps2.text + 4) 68 #if ATTY 69 #define termval() (vterm.text + 5) 70 #endif 71 72 #if ATTY 73 #define attyset() ((vatty.flags & VUNSET) == 0) 74 #endif 75 #define mpathset() ((vmpath.flags & VUNSET) == 0) 76 77 78 #ifdef __STDC__ 79 void initvar(); 80 void setvar(char *, char *, int); 81 void setvareq(char *, int); 82 struct strlist; 83 void listsetvar(struct strlist *); 84 char *lookupvar(char *); 85 char *bltinlookup(char *, int); 86 char **environment(); 87 int showvarscmd(int, char **); 88 void mklocal(char *); 89 void poplocalvars(void); 90 #else 91 void initvar(); 92 void setvar(); 93 void setvareq(); 94 void listsetvar(); 95 char *lookupvar(); 96 char *bltinlookup(); 97 char **environment(); 98 int showvarscmd(); 99 void mklocal(); 100 void poplocalvars(); 101 #endif 102