370f00cafc
were added to sh ... in other shells, setting such a variable (for most of them) causes it to lose its special properties, and act the same as any other variable. I had assumed that was just implementor laziness... I was wrong. From now on the NetBSD shell will act like the others, and if vars like HOSTNAME (and SECONDS, etc) are used as variables in a script or whatever, they will act just like normal variables (and unless this happens when they have been made local, or as a variable-assignment as a prefix to a command, the special properties they would have had otherwise are lost for the remainder of the life of the (sub-)shell in which the variables were set). Importing a value from the environment counts as setting the value for this purpose (so if HOSTNAME is set in the environment, the value there will be the value $HOSTNAME expands to). The two exceptions to this are LINENO and RANDOM. RANDOM needs to be able to be set to (re-)set its seed. LINENO needs to be able to be set (at least in the "local" command) to achieve the desired functionality. It is unlikely that any (sane) script is going to want to use those two as normal vars however. While here, fix a minor bug in popping local vars (fn return) that need to notify the shell of changes in value (like PATH). Change sh(1) to reflect this alteration. Also add doc of the (forgotten) magic var EUSER (which has been there since the others were added), and add a few more vars (which are documented in other places in sh(1) - like ENV) into the defined or used variable list (as well as wherever else they appear). XXX pullup -8
152 lines
5.1 KiB
C
152 lines
5.1 KiB
C
/* $NetBSD: var.h,v 1.38 2018/12/04 14:03:30 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)var.h 8.2 (Berkeley) 5/4/95
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*/
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#ifndef VUNSET /* double include protection */
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/*
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* Shell variables.
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*/
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/* flags */
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#define VUNSET 0x0001 /* the variable is not set */
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#define VEXPORT 0x0002 /* variable is exported */
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#define VREADONLY 0x0004 /* variable cannot be modified */
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#define VNOEXPORT 0x0008 /* variable may not be exported */
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#define VSTRFIXED 0x0010 /* variable struct is statically allocated */
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#define VTEXTFIXED 0x0020 /* text is statically allocated */
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#define VSTACK 0x0040 /* text is allocated on the stack */
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#define VNOFUNC 0x0100 /* don't call the callback function */
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#define VFUNCREF 0x0200 /* the function is called on ref, not set */
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#define VSPECIAL 0x1000 /* magic properties not lost when set */
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#define VDOEXPORT 0x2000 /* obey VEXPORT even if VNOEXPORT */
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#define VNOSET 0x4000 /* do not set variable - just readonly test */
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#define VNOERROR 0x8000 /* be quiet if set fails (no error msg) */
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struct var;
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union var_func_union { /* function to be called when: */
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void (*set_func)(const char *); /* variable gets set/unset */
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char*(*ref_func)(struct var *); /* variable is referenced */
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};
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struct var {
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struct var *next; /* next entry in hash list */
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int flags; /* flags are defined above */
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char *text; /* name=value */
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int name_len; /* length of name */
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union var_func_union v_u; /* function to apply (sometimes) */
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};
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struct localvar {
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struct localvar *next; /* next local variable in list */
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struct var *vp; /* the variable that was made local */
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int flags; /* saved flags */
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char *text; /* saved text */
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union var_func_union v_u; /* saved function */
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};
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extern struct localvar *localvars;
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extern struct var vifs;
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extern char ifs_default[];
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extern struct var vmail;
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extern struct var vmpath;
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extern struct var vpath;
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extern struct var vps1;
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extern struct var vps2;
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extern struct var vps4;
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extern struct var line_num;
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#ifndef SMALL
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extern struct var editrc;
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extern struct var vterm;
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extern struct var vtermcap;
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extern struct var vhistsize;
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extern struct var ps_lit;
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extern struct var euname;
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extern struct var random_num;
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extern intmax_t sh_start_time;
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#endif
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extern int line_number;
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extern int funclinebase;
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extern int funclineabs;
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/*
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* The following macros access the values of the above variables.
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* They have to skip over the name. They return the null string
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* for unset variables.
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*/
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#define ifsset() ((vifs.flags & VUNSET) == 0)
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#define ifsval() (ifsset() ? (vifs.text + 4) : ifs_default)
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#define mailval() (vmail.text + 5)
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#define mpathval() (vmpath.text + 9)
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#define pathval() (vpath.text + 5)
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#define ps1val() (vps1.text + 4)
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#define ps2val() (vps2.text + 4)
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#define ps4val() (vps4.text + 4)
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#define optindval() (voptind.text + 7)
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#ifndef SMALL
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#define histsizeval() (vhistsize.text + 9)
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#define termval() (vterm.text + 5)
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#endif
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#define mpathset() ((vmpath.flags & VUNSET) == 0)
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void initvar(void);
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void setvar(const char *, const char *, int);
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void setvareq(char *, int);
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struct strlist;
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void listsetvar(struct strlist *, int);
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char *lookupvar(const char *);
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char *bltinlookup(const char *, int);
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char **environment(void);
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void shprocvar(void);
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int showvars(const char *, int, int, const char *);
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void mklocal(const char *, int);
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void listmklocal(struct strlist *, int);
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void poplocalvars(void);
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int unsetvar(const char *, int);
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void choose_ps1(void);
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int setvarsafe(const char *, const char *, int);
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void print_quoted(const char *);
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int validname(const char *, int, int *);
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#endif
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