usr/dash/var.h

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1997-2005
 *	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)var.h	8.2 (Berkeley) 5/4/95
 */

/*
 * Shell variables.
 */

/* flags */
#define VEXPORT		0x01	/* variable is exported */
#define VREADONLY	0x02	/* variable cannot be modified */
#define VSTRFIXED	0x04	/* variable struct is statically allocated */
#define VTEXTFIXED	0x08	/* text is statically allocated */
#define VSTACK		0x10	/* text is allocated on the stack */
#define VUNSET		0x20	/* the variable is not set */
#define VNOFUNC		0x40	/* don't call the callback function */
#define VNOSET		0x80	/* do not set variable - just readonly test */
#define VNOSAVE		0x100	/* when text is on the heap before setvareq */


struct var {
	struct var *next;		/* next entry in hash list */
	int flags;			/* flags are defined above */
	const char *text;		/* name=value */
	void (*func)(const char *);
					/* function to be called when  */
					/* the variable gets set/unset */
};


struct localvar {
	struct localvar *next;		/* next local variable in list */
	struct var *vp;			/* the variable that was made local */
	int flags;			/* saved flags */
	const char *text;		/* saved text */
};


extern struct localvar *localvars;
extern struct var varinit[];

#if ATTY
#define vatty varinit[0]
#define vifs varinit[1]
#else
#define vifs varinit[0]
#endif
#define vmail (&vifs)[1]
#define vmpath (&vmail)[1]
#define vpath (&vmpath)[1]
#define vps1 (&vpath)[1]
#define vps2 (&vps1)[1]
#define vps4 (&vps2)[1]
#define voptind (&vps4)[1]
#ifndef SMALL
#define vterm (&voptind)[1]
#define vhistsize (&vterm)[1]
#endif

#ifdef IFS_BROKEN
extern const char defifsvar[];
#define defifs (defifsvar + 4)
#else
extern const char defifs[];
#endif
extern const char defpathvar[];
#define defpath (defpathvar + 5)

/*
 * The following macros access the values of the above variables.
 * They have to skip over the name.  They return the null string
 * for unset variables.
 */

#define ifsval()	(vifs.text + 4)
#define ifsset()	((vifs.flags & VUNSET) == 0)
#define mailval()	(vmail.text + 5)
#define mpathval()	(vmpath.text + 9)
#define pathval()	(vpath.text + 5)
#define ps1val()	(vps1.text + 4)
#define ps2val()	(vps2.text + 4)
#define ps4val()	(vps4.text + 4)
#define optindval()	(voptind.text + 7)
#ifndef SMALL
#define histsizeval()	(vhistsize.text + 9)
#define termval()	(vterm.text + 5)
#endif

#if ATTY
#define attyset()	((vatty.flags & VUNSET) == 0)
#endif
#define mpathset()	((vmpath.flags & VUNSET) == 0)

void initvar(void);
void setvar(const char *, const char *, int);
void setvareq(char *, int);
struct strlist;
void listsetvar(struct strlist *, int);
char *lookupvar(const char *);
char *bltinlookup(const char *);
char **listvars(int, int, char ***);
#define environment() listvars(VEXPORT, VUNSET, 0)
int showvars(const char *, int, int);
int exportcmd(int, char **);
int localcmd(int, char **);
void poplocalvars(void);
int unsetcmd(int, char **);
int unsetvar(const char *);
int setvarsafe(const char *, const char *, int);
int varcmp(const char *, const char *);

static inline int varequal(const char *a, const char *b) {
	return !varcmp(a, b);
}
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	/*
38	* Shell variables.
39	*/
40
41	/* flags */
42	#define VEXPORT 0x01 /* variable is exported */
43	#define VREADONLY 0x02 /* variable cannot be modified */
44	#define VSTRFIXED 0x04 /* variable struct is statically allocated */
45	#define VTEXTFIXED 0x08 /* text is statically allocated */
46	#define VSTACK 0x10 /* text is allocated on the stack */
47	#define VUNSET 0x20 /* the variable is not set */
48	#define VNOFUNC 0x40 /* don't call the callback function */
49	#define VNOSET 0x80 /* do not set variable - just readonly test */
50	#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
51
52
53	struct var {
54	struct var next; / next entry in hash list */
55	int flags; /* flags are defined above */
56	const 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	const char text; / saved text */
68	};
69
70
71	extern struct localvar *localvars;
72	extern struct var varinit[];
73
74	#if ATTY
75	#define vatty varinit[0]
76	#define vifs varinit[1]
77	#else
78	#define vifs varinit[0]
79	#endif
80	#define vmail (&vifs)[1]
81	#define vmpath (&vmail)[1]
82	#define vpath (&vmpath)[1]
83	#define vps1 (&vpath)[1]
84	#define vps2 (&vps1)[1]
85	#define vps4 (&vps2)[1]
86	#define voptind (&vps4)[1]
87	#ifndef SMALL
88	#define vterm (&voptind)[1]
89	#define vhistsize (&vterm)[1]
90	#endif
91
92	#ifdef IFS_BROKEN
93	extern const char defifsvar[];
94	#define defifs (defifsvar + 4)
95	#else
96	extern const char defifs[];
97	#endif
98	extern const char defpathvar[];
99	#define defpath (defpathvar + 5)
100
101	/*
102	* The following macros access the values of the above variables.
103	* They have to skip over the name. They return the null string
104	* for unset variables.
105	*/
106
107	#define ifsval() (vifs.text + 4)
108	#define ifsset() ((vifs.flags & VUNSET) == 0)
109	#define mailval() (vmail.text + 5)
110	#define mpathval() (vmpath.text + 9)
111	#define pathval() (vpath.text + 5)
112	#define ps1val() (vps1.text + 4)
113	#define ps2val() (vps2.text + 4)
114	#define ps4val() (vps4.text + 4)
115	#define optindval() (voptind.text + 7)
116	#ifndef SMALL
117	#define histsizeval() (vhistsize.text + 9)
118	#define termval() (vterm.text + 5)
119	#endif
120
121	#if ATTY
122	#define attyset() ((vatty.flags & VUNSET) == 0)
123	#endif
124	#define mpathset() ((vmpath.flags & VUNSET) == 0)
125
126	void initvar(void);
127	void setvar(const char , const char , int);
128	void setvareq(char *, int);
129	struct strlist;
130	void listsetvar(struct strlist *, int);
131	char lookupvar(const char );
132	char bltinlookup(const char );
133	char listvars(int, int, char *);
134	#define environment() listvars(VEXPORT, VUNSET, 0)
135	int showvars(const char *, int, int);
136	int exportcmd(int, char **);
137	int localcmd(int, char **);
138	void poplocalvars(void);
139	int unsetcmd(int, char **);
140	int unsetvar(const char *);
141	int setvarsafe(const char , const char , int);
142	int varcmp(const char , const char );
143
144	static inline int varequal(const char a, const char b) {
145	return !varcmp(a, b);
146	}