Annotation of src/usr.bin/window/var.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1983, 1993
! 5: * The Regents of the University of California. All rights reserved.
! 6: *
! 7: * This code is derived from software contributed to Berkeley by
! 8: * Edward Wang at The University of California, Berkeley.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: * 3. All advertising materials mentioning features or use of this software
! 19: * must display the following acknowledgement:
! 20: * This product includes software developed by the University of
! 21: * California, Berkeley and its contributors.
! 22: * 4. Neither the name of the University nor the names of its contributors
! 23: * may be used to endorse or promote products derived from this software
! 24: * without specific prior written permission.
! 25: *
! 26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 36: * SUCH DAMAGE.
! 37: */
! 38:
! 39: #ifndef lint
! 40: #if 0
! 41: static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93";
! 42: #else
! 43: static char rcsid[] = "$NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $";
! 44: #endif
! 45: #endif /* not lint */
! 46:
! 47: #include "value.h"
! 48: #include "var.h"
! 49: #include "string.h"
! 50: #include <stdlib.h>
! 51:
! 52: struct var *
! 53: var_set1(head, name, v)
! 54: struct var **head;
! 55: char *name;
! 56: struct value *v;
! 57: {
! 58: register struct var **p;
! 59: register struct var *r;
! 60: struct value val;
! 61:
! 62: /* do this first, easier to recover */
! 63: val = *v;
! 64: if (val.v_type == V_STR && val.v_str != 0 &&
! 65: (val.v_str = str_cpy(val.v_str)) == 0)
! 66: return 0;
! 67: if (*(p = var_lookup1(head, name)) == 0) {
! 68: r = (struct var *) malloc(sizeof (struct var));
! 69: if (r == 0) {
! 70: val_free(val);
! 71: return 0;
! 72: }
! 73: if ((r->r_name = str_cpy(name)) == 0) {
! 74: val_free(val);
! 75: free((char *) r);
! 76: return 0;
! 77: }
! 78: r->r_left = r->r_right = 0;
! 79: *p = r;
! 80: } else {
! 81: r = *p;
! 82: val_free(r->r_val);
! 83: }
! 84: r->r_val = val;
! 85: return r;
! 86: }
! 87:
! 88: struct var *
! 89: var_setstr1(head, name, str)
! 90: struct var **head;
! 91: char *name;
! 92: char *str;
! 93: {
! 94: struct value v;
! 95:
! 96: v.v_type = V_STR;
! 97: v.v_str = str;
! 98: return var_set1(head, name, &v);
! 99: }
! 100:
! 101: struct var *
! 102: var_setnum1(head, name, num)
! 103: struct var **head;
! 104: char *name;
! 105: int num;
! 106: {
! 107: struct value v;
! 108:
! 109: v.v_type = V_NUM;
! 110: v.v_num = num;
! 111: return var_set1(head, name, &v);
! 112: }
! 113:
! 114: var_unset1(head, name)
! 115: struct var **head;
! 116: char *name;
! 117: {
! 118: register struct var **p;
! 119: register struct var *r;
! 120:
! 121: if (*(p = var_lookup1(head, name)) == 0)
! 122: return -1;
! 123: r = *p;
! 124: *p = r->r_left;
! 125: while (*p != 0)
! 126: p = &(*p)->r_right;
! 127: *p = r->r_right;
! 128: val_free(r->r_val);
! 129: str_free(r->r_name);
! 130: free((char *) r);
! 131: return 0;
! 132: }
! 133:
! 134: struct var **
! 135: var_lookup1(p, name)
! 136: register struct var **p;
! 137: register char *name;
! 138: {
! 139: register cmp;
! 140:
! 141: while (*p != 0) {
! 142: if ((cmp = strcmp(name, (*p)->r_name)) < 0)
! 143: p = &(*p)->r_left;
! 144: else if (cmp > 0)
! 145: p = &(*p)->r_right;
! 146: else
! 147: break;
! 148: }
! 149: return p;
! 150: }
! 151:
! 152: var_walk1(r, func, a)
! 153: register struct var *r;
! 154: int (*func)();
! 155: long a;
! 156: {
! 157: if (r == 0)
! 158: return 0;
! 159: if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
! 160: || var_walk1(r->r_right, func, a) < 0)
! 161: return -1;
! 162: return 0;
! 163: }
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