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Annotation of 43BSDReno/usr.bin/window/var.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * 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 are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: static char sccsid[] = "@(#)var.c      3.12 (Berkeley) 6/6/90";
        !            25: #endif /* not lint */
        !            26: 
        !            27: #include "value.h"
        !            28: #include "var.h"
        !            29: #include "string.h"
        !            30: 
        !            31: char *malloc();
        !            32: 
        !            33: struct var *
        !            34: var_set1(head, name, v)
        !            35: struct var **head;
        !            36: char *name;
        !            37: struct value *v;
        !            38: {
        !            39:        register struct var **p;
        !            40:        register struct var *r;
        !            41:        struct value val;
        !            42: 
        !            43:        /* do this first, easier to recover */
        !            44:        val = *v;
        !            45:        if (val.v_type == V_STR && val.v_str != 0 &&
        !            46:            (val.v_str = str_cpy(val.v_str)) == 0)
        !            47:                return 0;
        !            48:        if (*(p = var_lookup1(head, name)) == 0) {
        !            49:                r = (struct var *) malloc(sizeof (struct var));
        !            50:                if (r == 0) {
        !            51:                        val_free(val);
        !            52:                        return 0;
        !            53:                }
        !            54:                if ((r->r_name = str_cpy(name)) == 0) {
        !            55:                        val_free(val);
        !            56:                        free((char *) r);
        !            57:                        return 0;
        !            58:                }
        !            59:                r->r_left = r->r_right = 0;
        !            60:                *p = r;
        !            61:        } else {
        !            62:                r = *p;
        !            63:                val_free(r->r_val);
        !            64:        }
        !            65:        r->r_val = val;
        !            66:        return r;
        !            67: }
        !            68: 
        !            69: struct var *
        !            70: var_setstr1(head, name, str)
        !            71: struct var **head;
        !            72: char *name;
        !            73: char *str;
        !            74: {
        !            75:        struct value v;
        !            76: 
        !            77:        v.v_type = V_STR;
        !            78:        v.v_str = str;
        !            79:        return var_set1(head, name, &v);
        !            80: }
        !            81: 
        !            82: struct var *
        !            83: var_setnum1(head, name, num)
        !            84: struct var **head;
        !            85: char *name;
        !            86: int num;
        !            87: {
        !            88:        struct value v;
        !            89: 
        !            90:        v.v_type = V_NUM;
        !            91:        v.v_num = num;
        !            92:        return var_set1(head, name, &v);
        !            93: }
        !            94: 
        !            95: var_unset1(head, name)
        !            96: struct var **head;
        !            97: char *name;
        !            98: {
        !            99:        register struct var **p;
        !           100:        register struct var *r;
        !           101: 
        !           102:        if (*(p = var_lookup1(head, name)) == 0)
        !           103:                return -1;
        !           104:        r = *p;
        !           105:        *p = r->r_left;
        !           106:        while (*p != 0)
        !           107:                p = &(*p)->r_right;
        !           108:        *p = r->r_right;
        !           109:        val_free(r->r_val);
        !           110:        str_free(r->r_name);
        !           111:        free((char *) r);
        !           112:        return 0;
        !           113: }
        !           114: 
        !           115: struct var **
        !           116: var_lookup1(p, name)
        !           117: register struct var **p;
        !           118: register char *name;
        !           119: {
        !           120:        register cmp;
        !           121: 
        !           122:        while (*p != 0) {
        !           123:                if ((cmp = strcmp(name, (*p)->r_name)) < 0)
        !           124:                        p = &(*p)->r_left;
        !           125:                else if (cmp > 0)
        !           126:                        p = &(*p)->r_right;
        !           127:                else
        !           128:                        break;
        !           129:        }
        !           130:        return p;
        !           131: }
        !           132: 
        !           133: var_walk1(r, func, a)
        !           134: register struct var *r;
        !           135: int (*func)();
        !           136: {
        !           137:        if (r == 0)
        !           138:                return 0;
        !           139:        if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
        !           140:            || var_walk1(r->r_right, func, a) < 0)
        !           141:                return -1;
        !           142:        return 0;
        !           143: }

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