freebsd-dev/bin/sh/var.h
Tor Egge 6f47734fd7 Better handling of word splitting. Don't record the same region
multiple times when performing nested variable expansion, and
preserve some quoting information in order to avoid removing
apparently empty expansion result.
1998-09-06 21:13:09 +00:00

134 lines
4.4 KiB
C

/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
* $Id: var.h,v 1.6 1997/02/22 13:58:48 peter Exp $
*/
/*
* Shell variables.
*/
/* flags */
#define VEXPORT 0x01 /* variable is exported */
#define VREADONLY 0x02 /* variable cannot be modified */
#define VSTRFIXED 0x04 /* variable struct is staticly allocated */
#define VTEXTFIXED 0x08 /* text is staticly 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 */
struct var {
struct var *next; /* next entry in hash list */
int flags; /* flags are defined above */
char *text; /* name=value */
void (*func) __P((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 */
char *text; /* saved text */
};
struct localvar *localvars;
#if ATTY
extern struct var vatty;
#endif
extern struct var vifs;
extern struct var vmail;
extern struct var vmpath;
extern struct var vpath;
extern struct var vps1;
extern struct var vps2;
#if ATTY
extern struct var vterm;
#endif
#ifndef NO_HISTORY
extern struct var vhistsize;
#endif
/*
* 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)
#if ATTY
#define termval() (vterm.text + 5)
#endif
#define optindval() (voptind.text + 7)
#ifndef NO_HISTORY
#define histsizeval() (vhistsize.text + 9)
#endif
#if ATTY
#define attyset() ((vatty.flags & VUNSET) == 0)
#endif
#define mpathset() ((vmpath.flags & VUNSET) == 0)
void initvar __P((void));
void setvar __P((char *, char *, int));
void setvareq __P((char *, int));
struct strlist;
void listsetvar __P((struct strlist *));
char *lookupvar __P((char *));
char *bltinlookup __P((char *, int));
char **environment __P((void));
void shprocvar __P((void));
int showvarscmd __P((int, char **));
int exportcmd __P((int, char **));
int localcmd __P((int, char **));
void mklocal __P((char *));
void poplocalvars __P((void));
int setvarcmd __P((int, char **));
int unsetcmd __P((int, char **));
int unsetvar __P((char *));
int setvarsafe __P((char *, char *, int));