1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Edward Wang at The University of California, Berkeley. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)var.c 8.1 (Berkeley) 6/6/93 37 * $FreeBSD: src/usr.bin/window/var.c,v 1.2.6.2 2001/05/17 09:45:01 obrien Exp $ 38 * $DragonFly: src/usr.bin/window/var.c,v 1.3 2005/02/28 13:57:05 joerg Exp $ 39 */ 40 41 #include "value.h" 42 #include "var.h" 43 #include "mystring.h" 44 45 struct var * 46 var_set1(head, name, v) 47 struct var **head; 48 char *name; 49 struct value *v; 50 { 51 register struct var **p; 52 register struct var *r; 53 struct value val; 54 55 /* do this first, easier to recover */ 56 val = *v; 57 if (val.v_type == V_STR && val.v_str != 0 && 58 (val.v_str = str_cpy(val.v_str)) == 0) 59 return 0; 60 if (*(p = var_lookup1(head, name)) == 0) { 61 r = (struct var *) malloc(sizeof (struct var)); 62 if (r == 0) { 63 val_free(val); 64 return 0; 65 } 66 if ((r->r_name = str_cpy(name)) == 0) { 67 val_free(val); 68 free((char *) r); 69 return 0; 70 } 71 r->r_left = r->r_right = 0; 72 *p = r; 73 } else { 74 r = *p; 75 val_free(r->r_val); 76 } 77 r->r_val = val; 78 return r; 79 } 80 81 struct var * 82 var_setstr1(head, name, str) 83 struct var **head; 84 char *name; 85 char *str; 86 { 87 struct value v; 88 89 v.v_type = V_STR; 90 v.v_str = str; 91 return var_set1(head, name, &v); 92 } 93 94 struct var * 95 var_setnum1(head, name, num) 96 struct var **head; 97 char *name; 98 int num; 99 { 100 struct value v; 101 102 v.v_type = V_NUM; 103 v.v_num = num; 104 return var_set1(head, name, &v); 105 } 106 107 var_unset1(head, name) 108 struct var **head; 109 char *name; 110 { 111 register struct var **p; 112 register struct var *r; 113 114 if (*(p = var_lookup1(head, name)) == 0) 115 return -1; 116 r = *p; 117 *p = r->r_left; 118 while (*p != 0) 119 p = &(*p)->r_right; 120 *p = r->r_right; 121 val_free(r->r_val); 122 str_free(r->r_name); 123 free((char *) r); 124 return 0; 125 } 126 127 struct var ** 128 var_lookup1(p, name) 129 register struct var **p; 130 register char *name; 131 { 132 register cmp; 133 134 while (*p != 0) { 135 if ((cmp = strcmp(name, (*p)->r_name)) < 0) 136 p = &(*p)->r_left; 137 else if (cmp > 0) 138 p = &(*p)->r_right; 139 else 140 break; 141 } 142 return p; 143 } 144 145 var_walk1(r, func, a) 146 register struct var *r; 147 int (*func)(); 148 long a; 149 { 150 if (r == 0) 151 return 0; 152 if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0 153 || var_walk1(r->r_right, func, a) < 0) 154 return -1; 155 return 0; 156 } 157