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Annotation of 43BSDTahoe/ucb/window/var.c, revision 1.1.1.1

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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