| 1 | /*-
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| 2 | * Copyright (c) 1991 The Regents of the University of California.
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * This code is derived from software contributed to Berkeley by
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| 6 | * Kenneth Almquist.
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that the following conditions
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| 10 | * are met:
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| 11 | * 1. Redistributions of source code must retain the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer.
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | * 3. All advertising materials mentioning features or use of this software
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| 17 | * must display the following acknowledgement:
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| 18 | * This product includes software developed by the University of
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| 19 | * California, Berkeley and its contributors.
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| 20 | * 4. Neither the name of the University nor the names of its contributors
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| 21 | * may be used to endorse or promote products derived from this software
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| 22 | * without specific prior written permission.
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| 23 | *
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| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 34 | * SUCH DAMAGE.
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| 35 | */
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| 36 |
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| 37 | #ifndef lint
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| 38 | static char sccsid[] = "@(#)var.c 5.3 (Berkeley) 4/12/91";
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| 39 | #endif /* not lint */
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| 40 |
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| 41 | /*
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| 42 | * Shell variables.
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| 43 | */
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| 44 |
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| 45 | #include "shell.h"
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| 46 | #include "output.h"
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| 47 | #include "expand.h"
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| 48 | #include "nodes.h" /* for other headers */
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| 49 | #include "eval.h" /* defines cmdenviron */
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| 50 | #include "exec.h"
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| 51 | #include "syntax.h"
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| 52 | #include "options.h"
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| 53 | #include "mail.h"
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| 54 | #include "var.h"
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| 55 | #include "memalloc.h"
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| 56 | #include "error.h"
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| 57 | #include "mystring.h"
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| 58 |
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| 59 |
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| 60 | #define VTABSIZE 39
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| 61 |
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| 62 |
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| 63 | struct varinit {
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| 64 | struct var *var;
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| 65 | int flags;
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| 66 | char *text;
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| 67 | };
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| 68 |
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| 69 |
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| 70 | #if ATTY
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| 71 | struct var vatty;
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| 72 | #endif
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| 73 | struct var vifs;
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| 74 | struct var vmail;
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| 75 | struct var vmpath;
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| 76 | struct var vpath;
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| 77 | struct var vps1;
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| 78 | struct var vps2;
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| 79 | struct var vpse;
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| 80 | struct var vvers;
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| 81 | #if ATTY
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| 82 | struct var vterm;
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| 83 | #endif
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| 84 |
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| 85 | const struct varinit varinit[] = {
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| 86 | #if ATTY
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| 87 | {&vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY="},
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| 88 | #endif
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| 89 | {&vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n"},
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| 90 | {&vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL="},
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| 91 | {&vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH="},
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| 92 | {&vpath, VSTRFIXED|VTEXTFIXED, "PATH=:/bin:/usr/bin"},
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| 93 | /*
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| 94 | * vps1 depends on uid
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| 95 | */
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| 96 | {&vps2, VSTRFIXED|VTEXTFIXED, "PS2=> "},
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| 97 | {&vpse, VSTRFIXED|VTEXTFIXED, "PSE=* "},
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| 98 | #if ATTY
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| 99 | {&vterm, VSTRFIXED|VTEXTFIXED|VUNSET, "TERM="},
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| 100 | #endif
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| 101 | {NULL, 0, NULL}
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| 102 | };
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| 103 |
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| 104 | struct var *vartab[VTABSIZE];
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| 105 |
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| 106 | STATIC void unsetvar __P((char *));
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| 107 | STATIC struct var **hashvar __P((char *));
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| 108 | STATIC int varequal __P((char *, char *));
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| 109 |
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| 110 | /*
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| 111 | * Initialize the varable symbol tables and import the environment
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| 112 | */
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| 113 |
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| 114 | #ifdef mkinit
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| 115 | INCLUDE "var.h"
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| 116 | INIT {
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| 117 | char **envp;
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| 118 | extern char **environ;
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| 119 |
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| 120 | initvar();
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| 121 | for (envp = environ ; *envp ; envp++) {
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| 122 | if (strchr(*envp, '=')) {
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| 123 | setvareq(*envp, VEXPORT|VTEXTFIXED);
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| 124 | }
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| 125 | }
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| 126 | }
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| 127 | #endif
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| 128 |
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| 129 |
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| 130 | /*
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| 131 | * This routine initializes the builtin variables. It is called when the
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| 132 | * shell is initialized and again when a shell procedure is spawned.
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| 133 | */
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| 134 |
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| 135 | void
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| 136 | initvar() {
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| 137 | const struct varinit *ip;
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| 138 | struct var *vp;
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| 139 | struct var **vpp;
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| 140 |
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| 141 | for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
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| 142 | if ((vp->flags & VEXPORT) == 0) {
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| 143 | vpp = hashvar(ip->text);
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| 144 | vp->next = *vpp;
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| 145 | *vpp = vp;
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| 146 | vp->text = ip->text;
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| 147 | vp->flags = ip->flags;
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| 148 | }
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| 149 | }
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| 150 | /*
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| 151 | * PS1 depends on uid
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| 152 | */
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| 153 | if ((vps1.flags & VEXPORT) == 0) {
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| 154 | vpp = hashvar("PS1=");
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| 155 | vps1.next = *vpp;
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| 156 | *vpp = &vps1;
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| 157 | vps1.text = getuid() ? "PS1=$ " : "PS1=# ";
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| 158 | vps1.flags = VSTRFIXED|VTEXTFIXED;
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | /*
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| 163 | * Set the value of a variable. The flags argument is ored with the
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| 164 | * flags of the variable. If val is NULL, the variable is unset.
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| 165 | */
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| 166 |
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| 167 | void
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| 168 | setvar(name, val, flags)
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| 169 | char *name, *val;
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| 170 | {
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| 171 | char *p, *q;
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| 172 | int len;
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| 173 | int namelen;
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| 174 | char *nameeq;
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| 175 | int isbad;
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| 176 |
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| 177 | isbad = 0;
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| 178 | p = name;
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| 179 | if (! is_name(*p++))
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| 180 | isbad = 1;
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| 181 | for (;;) {
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| 182 | if (! is_in_name(*p)) {
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| 183 | if (*p == '\0' || *p == '=')
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| 184 | break;
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| 185 | isbad = 1;
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| 186 | }
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| 187 | p++;
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| 188 | }
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| 189 | namelen = p - name;
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| 190 | if (isbad)
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| 191 | error("%.*s: is read only", namelen, name);
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| 192 | len = namelen + 2; /* 2 is space for '=' and '\0' */
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| 193 | if (val == NULL) {
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| 194 | flags |= VUNSET;
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| 195 | } else {
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| 196 | len += strlen(val);
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| 197 | }
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| 198 | p = nameeq = ckmalloc(len);
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| 199 | q = name;
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| 200 | while (--namelen >= 0)
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| 201 | *p++ = *q++;
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| 202 | *p++ = '=';
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| 203 | *p = '\0';
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| 204 | if (val)
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| 205 | scopy(val, p);
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| 206 | setvareq(nameeq, flags);
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| 207 | }
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| 208 |
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| 209 |
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| 210 |
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| 211 | /*
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| 212 | * Same as setvar except that the variable and value are passed in
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| 213 | * the first argument as name=value. Since the first argument will
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| 214 | * be actually stored in the table, it should not be a string that
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| 215 | * will go away.
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| 216 | */
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| 217 |
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| 218 | void
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| 219 | setvareq(s, flags)
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| 220 | char *s;
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| 221 | {
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| 222 | struct var *vp, **vpp;
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| 223 |
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| 224 | vpp = hashvar(s);
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| 225 | for (vp = *vpp ; vp ; vp = vp->next) {
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| 226 | if (varequal(s, vp->text)) {
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| 227 | if (vp->flags & VREADONLY) {
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| 228 | int len = strchr(s, '=') - s;
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| 229 | error("%.*s: is read only", len, s);
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| 230 | }
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| 231 | INTOFF;
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| 232 | if (vp == &vpath)
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| 233 | changepath(s + 5); /* 5 = strlen("PATH=") */
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| 234 | if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
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| 235 | ckfree(vp->text);
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| 236 | vp->flags &=~ (VTEXTFIXED|VSTACK|VUNSET);
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| 237 | vp->flags |= flags;
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| 238 | vp->text = s;
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| 239 | if (vp == &vmpath || (vp == &vmail && ! mpathset()))
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| 240 | chkmail(1);
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| 241 | INTON;
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| 242 | return;
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| 243 | }
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| 244 | }
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| 245 | /* not found */
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| 246 | vp = ckmalloc(sizeof (*vp));
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| 247 | vp->flags = flags;
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| 248 | vp->text = s;
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| 249 | vp->next = *vpp;
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| 250 | *vpp = vp;
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| 251 | }
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| 252 |
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| 253 |
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| 254 |
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| 255 | /*
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| 256 | * Process a linked list of variable assignments.
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| 257 | */
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| 258 |
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| 259 | void
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| 260 | listsetvar(list)
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| 261 | struct strlist *list;
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| 262 | {
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| 263 | struct strlist *lp;
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| 264 |
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| 265 | INTOFF;
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| 266 | for (lp = list ; lp ; lp = lp->next) {
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| 267 | setvareq(savestr(lp->text), 0);
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| 268 | }
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| 269 | INTON;
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| 270 | }
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| 271 |
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| 272 |
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| 273 |
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| 274 | /*
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| 275 | * Find the value of a variable. Returns NULL if not set.
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| 276 | */
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| 277 |
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| 278 | char *
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| 279 | lookupvar(name)
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| 280 | char *name;
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| 281 | {
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| 282 | struct var *v;
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| 283 |
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| 284 | for (v = *hashvar(name) ; v ; v = v->next) {
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| 285 | if (varequal(v->text, name)) {
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| 286 | if (v->flags & VUNSET)
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| 287 | return NULL;
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| 288 | return strchr(v->text, '=') + 1;
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| 289 | }
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| 290 | }
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| 291 | return NULL;
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| 292 | }
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| 293 |
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| 294 |
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| 295 |
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| 296 | /*
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| 297 | * Search the environment of a builtin command. If the second argument
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| 298 | * is nonzero, return the value of a variable even if it hasn't been
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| 299 | * exported.
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| 300 | */
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| 301 |
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| 302 | char *
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| 303 | bltinlookup(name, doall)
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| 304 | char *name;
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| 305 | {
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| 306 | struct strlist *sp;
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| 307 | struct var *v;
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| 308 |
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| 309 | for (sp = cmdenviron ; sp ; sp = sp->next) {
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| 310 | if (varequal(sp->text, name))
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| 311 | return strchr(sp->text, '=') + 1;
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| 312 | }
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| 313 | for (v = *hashvar(name) ; v ; v = v->next) {
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| 314 | if (varequal(v->text, name)) {
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| 315 | if (v->flags & VUNSET
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| 316 | || ! doall && (v->flags & VEXPORT) == 0)
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| 317 | return NULL;
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| 318 | return strchr(v->text, '=') + 1;
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| 319 | }
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| 320 | }
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| 321 | return NULL;
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| 322 | }
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| 323 |
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| 324 |
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| 325 |
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| 326 | /*
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| 327 | * Generate a list of exported variables. This routine is used to construct
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| 328 | * the third argument to execve when executing a program.
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| 329 | */
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| 330 |
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| 331 | char **
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| 332 | environment() {
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| 333 | int nenv;
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| 334 | struct var **vpp;
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| 335 | struct var *vp;
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| 336 | char **env, **ep;
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| 337 |
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| 338 | nenv = 0;
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| 339 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 340 | for (vp = *vpp ; vp ; vp = vp->next)
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| 341 | if (vp->flags & VEXPORT)
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| 342 | nenv++;
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| 343 | }
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| 344 | ep = env = stalloc((nenv + 1) * sizeof *env);
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| 345 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 346 | for (vp = *vpp ; vp ; vp = vp->next)
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| 347 | if (vp->flags & VEXPORT)
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| 348 | *ep++ = vp->text;
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| 349 | }
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| 350 | *ep = NULL;
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| 351 | return env;
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| 352 | }
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| 353 |
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| 354 |
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| 355 | /*
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| 356 | * Called when a shell procedure is invoked to clear out nonexported
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| 357 | * variables. It is also necessary to reallocate variables of with
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| 358 | * VSTACK set since these are currently allocated on the stack.
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| 359 | */
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| 360 |
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| 361 | #ifdef mkinit
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| 362 | MKINIT void shprocvar();
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| 363 |
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| 364 | SHELLPROC {
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| 365 | shprocvar();
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| 366 | }
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| 367 | #endif
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| 368 |
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| 369 | void
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| 370 | shprocvar() {
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| 371 | struct var **vpp;
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| 372 | struct var *vp, **prev;
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| 373 |
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| 374 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 375 | for (prev = vpp ; (vp = *prev) != NULL ; ) {
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| 376 | if ((vp->flags & VEXPORT) == 0) {
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| 377 | *prev = vp->next;
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| 378 | if ((vp->flags & VTEXTFIXED) == 0)
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| 379 | ckfree(vp->text);
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| 380 | if ((vp->flags & VSTRFIXED) == 0)
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| 381 | ckfree(vp);
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| 382 | } else {
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| 383 | if (vp->flags & VSTACK) {
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| 384 | vp->text = savestr(vp->text);
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| 385 | vp->flags &=~ VSTACK;
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| 386 | }
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| 387 | prev = &vp->next;
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| 388 | }
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| 389 | }
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| 390 | }
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| 391 | initvar();
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| 392 | }
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| 393 |
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| 394 |
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| 395 |
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| 396 | /*
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| 397 | * Command to list all variables which are set. Currently this command
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| 398 | * is invoked from the set command when the set command is called without
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| 399 | * any variables.
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| 400 | */
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| 401 |
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| 402 | int
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| 403 | showvarscmd(argc, argv) char **argv; {
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| 404 | struct var **vpp;
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| 405 | struct var *vp;
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| 406 |
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| 407 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
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| 408 | for (vp = *vpp ; vp ; vp = vp->next) {
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| 409 | if ((vp->flags & VUNSET) == 0)
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| 410 | out1fmt("%s\n", vp->text);
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| 411 | }
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| 412 | }
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| 413 | return 0;
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| 414 | }
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| 415 |
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| 416 |
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| 417 |
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| 418 | /*
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| 419 | * The export and readonly commands.
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| 420 | */
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| 421 |
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| 422 | int
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| 423 | exportcmd(argc, argv) char **argv; {
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| 424 | struct var **vpp;
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| 425 | struct var *vp;
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| 426 | char *name;
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| 427 | char *p;
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| 428 | int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
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| 429 |
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| 430 | listsetvar(cmdenviron);
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| 431 | if (argc > 1) {
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| 432 | while ((name = *argptr++) != NULL) {
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| 433 | if ((p = strchr(name, '=')) != NULL) {
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| 434 | p++;
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| 435 | } else {
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| 436 | vpp = hashvar(name);
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| 437 | for (vp = *vpp ; vp ; vp = vp->next) {
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| 438 | if (varequal(vp->text, name)) {
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| 439 | vp->flags |= flag;
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| 440 | goto found;
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| 441 | }
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| 442 | }
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|---|
| 443 | }
|
|---|
| 444 | setvar(name, p, flag);
|
|---|
| 445 | found:;
|
|---|
| 446 | }
|
|---|
| 447 | } else {
|
|---|
| 448 | for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
|
|---|
| 449 | for (vp = *vpp ; vp ; vp = vp->next) {
|
|---|
| 450 | if (vp->flags & flag) {
|
|---|
| 451 | for (p = vp->text ; *p != '=' ; p++)
|
|---|
| 452 | out1c(*p);
|
|---|
| 453 | out1c('\n');
|
|---|
| 454 | }
|
|---|
| 455 | }
|
|---|
| 456 | }
|
|---|
| 457 | }
|
|---|
| 458 | return 0;
|
|---|
| 459 | }
|
|---|
| 460 |
|
|---|
| 461 |
|
|---|
| 462 | /*
|
|---|
| 463 | * The "local" command.
|
|---|
| 464 | */
|
|---|
| 465 |
|
|---|
| 466 | localcmd(argc, argv) char **argv; {
|
|---|
| 467 | char *name;
|
|---|
| 468 |
|
|---|
| 469 | if (! in_function())
|
|---|
| 470 | error("Not in a function");
|
|---|
| 471 | while ((name = *argptr++) != NULL) {
|
|---|
| 472 | mklocal(name);
|
|---|
| 473 | }
|
|---|
| 474 | return 0;
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 |
|
|---|
| 478 | /*
|
|---|
| 479 | * Make a variable a local variable. When a variable is made local, it's
|
|---|
| 480 | * value and flags are saved in a localvar structure. The saved values
|
|---|
| 481 | * will be restored when the shell function returns. We handle the name
|
|---|
| 482 | * "-" as a special case.
|
|---|
| 483 | */
|
|---|
| 484 |
|
|---|
| 485 | void
|
|---|
| 486 | mklocal(name)
|
|---|
| 487 | char *name;
|
|---|
| 488 | {
|
|---|
| 489 | struct localvar *lvp;
|
|---|
| 490 | struct var **vpp;
|
|---|
| 491 | struct var *vp;
|
|---|
| 492 |
|
|---|
| 493 | INTOFF;
|
|---|
| 494 | lvp = ckmalloc(sizeof (struct localvar));
|
|---|
| 495 | if (name[0] == '-' && name[1] == '\0') {
|
|---|
| 496 | lvp->text = ckmalloc(sizeof optval);
|
|---|
| 497 | bcopy(optval, lvp->text, sizeof optval);
|
|---|
| 498 | vp = NULL;
|
|---|
| 499 | } else {
|
|---|
| 500 | vpp = hashvar(name);
|
|---|
| 501 | for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next);
|
|---|
| 502 | if (vp == NULL) {
|
|---|
| 503 | if (strchr(name, '='))
|
|---|
| 504 | setvareq(savestr(name), VSTRFIXED);
|
|---|
| 505 | else
|
|---|
| 506 | setvar(name, NULL, VSTRFIXED);
|
|---|
| 507 | vp = *vpp; /* the new variable */
|
|---|
| 508 | lvp->text = NULL;
|
|---|
| 509 | lvp->flags = VUNSET;
|
|---|
| 510 | } else {
|
|---|
| 511 | lvp->text = vp->text;
|
|---|
| 512 | lvp->flags = vp->flags;
|
|---|
| 513 | vp->flags |= VSTRFIXED|VTEXTFIXED;
|
|---|
| 514 | if (strchr(name, '='))
|
|---|
| 515 | setvareq(savestr(name), 0);
|
|---|
| 516 | }
|
|---|
| 517 | }
|
|---|
| 518 | lvp->vp = vp;
|
|---|
| 519 | lvp->next = localvars;
|
|---|
| 520 | localvars = lvp;
|
|---|
| 521 | INTON;
|
|---|
| 522 | }
|
|---|
| 523 |
|
|---|
| 524 |
|
|---|
| 525 | /*
|
|---|
| 526 | * Called after a function returns.
|
|---|
| 527 | */
|
|---|
| 528 |
|
|---|
| 529 | void
|
|---|
| 530 | poplocalvars() {
|
|---|
| 531 | struct localvar *lvp;
|
|---|
| 532 | struct var *vp;
|
|---|
| 533 |
|
|---|
| 534 | while ((lvp = localvars) != NULL) {
|
|---|
| 535 | localvars = lvp->next;
|
|---|
| 536 | vp = lvp->vp;
|
|---|
| 537 | if (vp == NULL) { /* $- saved */
|
|---|
| 538 | bcopy(lvp->text, optval, sizeof optval);
|
|---|
| 539 | ckfree(lvp->text);
|
|---|
| 540 | } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
|
|---|
| 541 | unsetvar(vp->text);
|
|---|
| 542 | } else {
|
|---|
| 543 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 544 | ckfree(vp->text);
|
|---|
| 545 | vp->flags = lvp->flags;
|
|---|
| 546 | vp->text = lvp->text;
|
|---|
| 547 | }
|
|---|
| 548 | ckfree(lvp);
|
|---|
| 549 | }
|
|---|
| 550 | }
|
|---|
| 551 |
|
|---|
| 552 |
|
|---|
| 553 | setvarcmd(argc, argv) char **argv; {
|
|---|
| 554 | if (argc <= 2)
|
|---|
| 555 | return unsetcmd(argc, argv);
|
|---|
| 556 | else if (argc == 3)
|
|---|
| 557 | setvar(argv[1], argv[2], 0);
|
|---|
| 558 | else
|
|---|
| 559 | error("List assignment not implemented");
|
|---|
| 560 | return 0;
|
|---|
| 561 | }
|
|---|
| 562 |
|
|---|
| 563 |
|
|---|
| 564 | /*
|
|---|
| 565 | * The unset builtin command. We unset the function before we unset the
|
|---|
| 566 | * variable to allow a function to be unset when there is a readonly variable
|
|---|
| 567 | * with the same name.
|
|---|
| 568 | */
|
|---|
| 569 |
|
|---|
| 570 | unsetcmd(argc, argv) char **argv; {
|
|---|
| 571 | char **ap;
|
|---|
| 572 |
|
|---|
| 573 | for (ap = argv + 1 ; *ap ; ap++) {
|
|---|
| 574 | unsetfunc(*ap);
|
|---|
| 575 | unsetvar(*ap);
|
|---|
| 576 | }
|
|---|
| 577 | return 0;
|
|---|
| 578 | }
|
|---|
| 579 |
|
|---|
| 580 |
|
|---|
| 581 | /*
|
|---|
| 582 | * Unset the specified variable.
|
|---|
| 583 | */
|
|---|
| 584 |
|
|---|
| 585 | STATIC void
|
|---|
| 586 | unsetvar(s)
|
|---|
| 587 | char *s;
|
|---|
| 588 | {
|
|---|
| 589 | struct var **vpp;
|
|---|
| 590 | struct var *vp;
|
|---|
| 591 |
|
|---|
| 592 | vpp = hashvar(s);
|
|---|
| 593 | for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
|
|---|
| 594 | if (varequal(vp->text, s)) {
|
|---|
| 595 | INTOFF;
|
|---|
| 596 | if (*(strchr(vp->text, '=') + 1) != '\0'
|
|---|
| 597 | || vp->flags & VREADONLY) {
|
|---|
| 598 | setvar(s, nullstr, 0);
|
|---|
| 599 | }
|
|---|
| 600 | vp->flags &=~ VEXPORT;
|
|---|
| 601 | vp->flags |= VUNSET;
|
|---|
| 602 | if ((vp->flags & VSTRFIXED) == 0) {
|
|---|
| 603 | if ((vp->flags & VTEXTFIXED) == 0)
|
|---|
| 604 | ckfree(vp->text);
|
|---|
| 605 | *vpp = vp->next;
|
|---|
| 606 | ckfree(vp);
|
|---|
| 607 | }
|
|---|
| 608 | INTON;
|
|---|
| 609 | return;
|
|---|
| 610 | }
|
|---|
| 611 | }
|
|---|
| 612 | }
|
|---|
| 613 |
|
|---|
| 614 |
|
|---|
| 615 |
|
|---|
| 616 | /*
|
|---|
| 617 | * Find the appropriate entry in the hash table from the name.
|
|---|
| 618 | */
|
|---|
| 619 |
|
|---|
| 620 | STATIC struct var **
|
|---|
| 621 | hashvar(p)
|
|---|
| 622 | register char *p;
|
|---|
| 623 | {
|
|---|
| 624 | unsigned int hashval;
|
|---|
| 625 |
|
|---|
| 626 | hashval = *p << 4;
|
|---|
| 627 | while (*p && *p != '=')
|
|---|
| 628 | hashval += *p++;
|
|---|
| 629 | return &vartab[hashval % VTABSIZE];
|
|---|
| 630 | }
|
|---|
| 631 |
|
|---|
| 632 |
|
|---|
| 633 |
|
|---|
| 634 | /*
|
|---|
| 635 | * Returns true if the two strings specify the same varable. The first
|
|---|
| 636 | * variable name is terminated by '='; the second may be terminated by
|
|---|
| 637 | * either '=' or '\0'.
|
|---|
| 638 | */
|
|---|
| 639 |
|
|---|
| 640 | STATIC int
|
|---|
| 641 | varequal(p, q)
|
|---|
| 642 | register char *p, *q;
|
|---|
| 643 | {
|
|---|
| 644 | while (*p == *q++) {
|
|---|
| 645 | if (*p++ == '=')
|
|---|
| 646 | return 1;
|
|---|
| 647 | }
|
|---|
| 648 | if (*p == '=' && *(q - 1) == '\0')
|
|---|
| 649 | return 1;
|
|---|
| 650 | return 0;
|
|---|
| 651 | }
|
|---|
