fix bug that can cause recursive .forward files to fail

[unix-history] / usr / src / bin / sh / var.h

/*-
* 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.
*
* %sccs.include.redist.c%
*
*      @(#)var.h       8.1 (Berkeley) %G%
*/

/*
* Shell variables.
*/

/* flags */
#define VEXPORT         01      /* variable is exported */
#define VREADONLY       02      /* variable cannot be modified */
#define VSTRFIXED       04      /* variable struct is staticly allocated */
#define VTEXTFIXED      010     /* text is staticly allocated */
#define VSTACK          020     /* text is allocated on the stack */
#define VUNSET          040     /* the variable is not set */


struct var {
       struct var *next;               /* next entry in hash list */
       int flags;              /* flags are defined above */
       char *text;             /* name=value */
};


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

/*
* 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 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

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


#ifdef __STDC__
void initvar();
void setvar(char *, char *, int);
void setvareq(char *, int);
struct strlist;
void listsetvar(struct strlist *);
char *lookupvar(char *);
char *bltinlookup(char *, int);
char **environment();
int showvarscmd(int, char **);
void mklocal(char *);
void poplocalvars(void);
#else
void initvar();
void setvar();
void setvareq();
void listsetvar();
char *lookupvar();
char *bltinlookup();
char **environment();
int showvarscmd();
void mklocal();
void poplocalvars();
#endif