/* $OpenBSD: var.c,v 1.3 1997/02/25 00:04:31 downsj Exp $ */ /* $NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Edward Wang at The University of California, Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint #if 0 static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93"; #else static char rcsid[] = "$OpenBSD: var.c,v 1.3 1997/02/25 00:04:31 downsj Exp $"; #endif #endif /* not lint */ #include "value.h" #include "var.h" #include "string.h" #include <stdlib.h> struct var * var_set1(head, name, v) struct var **head; char *name; struct value *v; { register struct var **p; register struct var *r; struct value val; /* do this first, easier to recover */ val = *v; if (val.v_type == V_STR && val.v_str != 0 && (val.v_str = str_cpy(val.v_str)) == 0) return 0; if (*(p = var_lookup1(head, name)) == 0) { r = (struct var *) malloc(sizeof (struct var)); if (r == 0) { val_free(val); return 0; } if ((r->r_name = str_cpy(name)) == 0) { val_free(val); free((char *) r); return 0; } r->r_left = r->r_right = 0; *p = r; } else { r = *p; val_free(r->r_val); } r->r_val = val; return r; } struct var * var_setstr1(head, name, str) struct var **head; char *name; char *str; { struct value v; v.v_type = V_STR; v.v_str = str; return var_set1(head, name, &v); } struct var * var_setnum1(head, name, num) struct var **head; char *name; int num; { struct value v; v.v_type = V_NUM; v.v_num = num; return var_set1(head, name, &v); } var_unset1(head, name) struct var **head; char *name; { register struct var **p; register struct var *r; if (*(p = var_lookup1(head, name)) == 0) return -1; r = *p; *p = r->r_left; while (*p != 0) p = &(*p)->r_right; *p = r->r_right; val_free(r->r_val); str_free(r->r_name); free((char *) r); return 0; } struct var ** var_lookup1(p, name) register struct var **p; register char *name; { register cmp; while (*p != 0) { if ((cmp = strcmp(name, (*p)->r_name)) < 0) p = &(*p)->r_left; else if (cmp > 0) p = &(*p)->r_right; else break; } return p; } var_walk1(r, func, a) register struct var *r; int (*func)(); long a; { if (r == 0) return 0; if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0 || var_walk1(r->r_right, func, a) < 0) return -1; return 0; }