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var.h

/*    $NetBSD: var.h,v 1.21 2003/01/22 20:36:04 dsl 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 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);
}

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