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Annotation of 43BSDTahoe/ucb/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:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)var.c      3.10 (Berkeley) 6/29/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: #include "value.h"
        !            23: #include "var.h"
        !            24: #include "string.h"
        !            25: 
        !            26: char *malloc();
        !            27: 
        !            28: struct var *
        !            29: var_set1(head, name, v)
        !            30: struct var **head;
        !            31: char *name;
        !            32: struct value *v;
        !            33: {
        !            34:        register struct var **p;
        !            35:        register struct var *r;
        !            36:        struct value val;
        !            37: 
        !            38:        /* do this first, easier to recover */
        !            39:        val = *v;
        !            40:        if (val.v_type == V_STR && val.v_str != 0 &&
        !            41:            (val.v_str = str_cpy(val.v_str)) == 0)
        !            42:                return 0;
        !            43:        if (*(p = var_lookup1(head, name)) == 0) {
        !            44:                r = (struct var *) malloc(sizeof (struct var));
        !            45:                if (r == 0) {
        !            46:                        val_free(val);
        !            47:                        return 0;
        !            48:                }
        !            49:                if ((r->r_name = str_cpy(name)) == 0) {
        !            50:                        val_free(val);
        !            51:                        free((char *) r);
        !            52:                        return 0;
        !            53:                }
        !            54:                r->r_left = r->r_right = 0;
        !            55:                *p = r;
        !            56:        } else {
        !            57:                r = *p;
        !            58:                val_free(r->r_val);
        !            59:        }
        !            60:        r->r_val = val;
        !            61:        return r;
        !            62: }
        !            63: 
        !            64: struct var *
        !            65: var_setstr1(head, name, str)
        !            66: struct var **head;
        !            67: char *name;
        !            68: char *str;
        !            69: {
        !            70:        struct value v;
        !            71: 
        !            72:        v.v_type = V_STR;
        !            73:        v.v_str = str;
        !            74:        return var_set1(head, name, &v);
        !            75: }
        !            76: 
        !            77: struct var *
        !            78: var_setnum1(head, name, num)
        !            79: struct var **head;
        !            80: char *name;
        !            81: int num;
        !            82: {
        !            83:        struct value v;
        !            84: 
        !            85:        v.v_type = V_NUM;
        !            86:        v.v_num = num;
        !            87:        return var_set1(head, name, &v);
        !            88: }
        !            89: 
        !            90: var_unset1(head, name)
        !            91: struct var **head;
        !            92: char *name;
        !            93: {
        !            94:        register struct var **p;
        !            95:        register struct var *r;
        !            96: 
        !            97:        if (*(p = var_lookup1(head, name)) == 0)
        !            98:                return -1;
        !            99:        r = *p;
        !           100:        *p = r->r_left;
        !           101:        while (*p != 0)
        !           102:                p = &(*p)->r_right;
        !           103:        *p = r->r_right;
        !           104:        val_free(r->r_val);
        !           105:        str_free(r->r_name);
        !           106:        free((char *) r);
        !           107:        return 0;
        !           108: }
        !           109: 
        !           110: struct var **
        !           111: var_lookup1(p, name)
        !           112: register struct var **p;
        !           113: register char *name;
        !           114: {
        !           115:        register cmp;
        !           116: 
        !           117:        while (*p != 0) {
        !           118:                if ((cmp = strcmp(name, (*p)->r_name)) < 0)
        !           119:                        p = &(*p)->r_left;
        !           120:                else if (cmp > 0)
        !           121:                        p = &(*p)->r_right;
        !           122:                else
        !           123:                        break;
        !           124:        }
        !           125:        return p;
        !           126: }
        !           127: 
        !           128: var_walk1(r, func, a)
        !           129: register struct var *r;
        !           130: int (*func)();
        !           131: {
        !           132:        if (r == 0)
        !           133:                return 0;
        !           134:        if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
        !           135:            || var_walk1(r->r_right, func, a) < 0)
        !           136:                return -1;
        !           137:        return 0;
        !           138: }

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