source: mainline/uspace/app/ash/var.h@ 8ccd2ea

/*      $NetBSD: var.h,v 1.18 2000/05/22 10:18:47 elric Exp $   */

/*-
 * 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
 */

/*
 * 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) (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;
#ifndef SMALL
extern struct var vterm;
extern struct var vtermcap;
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)
#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 *);
char *lookupvar (const char *);
char *bltinlookup (const char *, int);
char **environment (void);
void shprocvar (void);
int showvarscmd (int, char **);
int exportcmd (int, char **);
int localcmd (int, char **);
void mklocal (char *);
void poplocalvars (void);
int setvarcmd (int, char **);
int unsetcmd (int, char **);
int unsetvar (const char *);
int setvarsafe (const char *, const char *, int);