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	niro	532	/*-
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			}