1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1997-2005
5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)var.h 8.2 (Berkeley) 5/4/95
35 */
36
37 #include <inttypes.h>
38
39 /*
40 * Shell variables.
41 */
42
43 /* flags */
44 #define VEXPORT 0x01 /* variable is exported */
45 #define VREADONLY 0x02 /* variable cannot be modified */
46 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
47 #define VTEXTFIXED 0x08 /* text is statically allocated */
48 #define VSTACK 0x10 /* text is allocated on the stack */
49 #define VUNSET 0x20 /* the variable is not set */
50 #define VNOFUNC 0x40 /* don't call the callback function */
51 #define VNOSET 0x80 /* do not set variable - just readonly test */
52 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
53
54
55 struct var {
56 struct var *next; /* next entry in hash list */
57 int flags; /* flags are defined above */
58 const char *text; /* name=value */
59 void (*func)(const char *);
60 /* function to be called when */
61 /* the variable gets set/unset */
62 };
63
64
65 struct localvar {
66 struct localvar *next; /* next local variable in list */
67 struct var *vp; /* the variable that was made local */
68 int flags; /* saved flags */
69 const char *text; /* saved text */
70 };
71
72 struct localvar_list;
73
74
75 extern struct localvar *localvars;
76 extern struct var varinit[];
77
78 #if ATTY
79 #define vatty varinit[0]
80 #define vifs varinit[1]
81 #else
82 #define vifs varinit[0]
83 #endif
84 #define vpath (&vifs)[1]
85 #define vps1 (&vpath)[1]
86 #define vps2 (&vps1)[1]
87 #define vps4 (&vps2)[1]
88 #define voptind (&vps4)[1]
89 #ifdef WITH_LINENO
90 #define vlineno (&voptind)[1]
91 #endif
92
93 #ifdef IFS_BROKEN
94 extern const char defifsvar[];
95 #define defifs (defifsvar + 4)
96 #else
97 extern const char defifs[];
98 #endif
99 extern const char defpathvar[];
100 #define defpath (&defpathvar[sizeof("PATH=") - 1])
101
102 extern int lineno;
103 extern char linenovar[];
104
105 /*
106 * The following macros access the values of the above variables.
107 * They have to skip over the name. They return the null string
108 * for unset variables.
109 */
110
111 #define ifsval() (vifs.text + 4)
112 #define ifsset() ((vifs.flags & VUNSET) == 0)
113 #define mailval() (vmail.text + 5)
114 #define mpathval() (vmpath.text + 9)
115 #define pathval() (vpath.text + 5)
116 #define ps1val() (vps1.text + 4)
117 #define ps2val() (vps2.text + 4)
118 #define ps4val() (vps4.text + 4)
119 #define optindval() (voptind.text + 7)
120 #define linenoval() (vlineno.text + 7)
121
122 #if ATTY
123 #define attyset() ((vatty.flags & VUNSET) == 0)
124 #endif
125 #define mpathset() ((vmpath.flags & VUNSET) == 0)
126
127 void initvar(void);
128 struct var *setvar(const char *name, const char *val, int flags);
129 intmax_t setvarint(const char *, intmax_t, int);
130 struct var *setvareq(char *s, int flags);
131 struct strlist;
132 void listsetvar(struct strlist *, int);
133 char *lookupvar(const char *);
134 intmax_t lookupvarint(const char *);
135 char **listvars(int, int, char ***);
136 #define environment() listvars(VEXPORT, VUNSET, 0)
137 int showvars(const char *, int, int);
138 int exportcmd(int, char **);
139 int localcmd(int, char **);
140 void mklocal(char *);
141 struct localvar_list *pushlocalvars(void);
142 void poplocalvars(int);
143 void unwindlocalvars(struct localvar_list *stop);
144 int unsetcmd(int, char **);
145 void unsetvar(const char *);
146 int varcmp(const char *, const char *);
147
varequal(const char * a,const char * b)148 static inline int varequal(const char *a, const char *b) {
149 return !varcmp(a, b);
150 }
151
152 /*
153 * Search the environment of a builtin command.
154 */
155
bltinlookup(const char * name)156 static inline char *bltinlookup(const char *name)
157 {
158 return lookupvar(name);
159 }
160
161
162