Return to var.c CVS log

Up to [CSRG BSD Unix] / 43BSD / ucb / window

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

1.1       root        1: #ifndef lint
                      2: static char sccsid[] = "@(#)var.c      3.8 4/24/85";
                      3: #endif
                      4: 
                      5: /*
                      6:  * Copyright (c) 1983 Regents of the University of California,
                      7:  * All rights reserved.  Redistribution permitted subject to
                      8:  * the terms of the Berkeley Software License Agreement.
                      9:  */
                     10: 
                     11: #include "value.h"
                     12: #include "var.h"
                     13: #include "string.h"
                     14: 
                     15: char *malloc();
                     16: 
                     17: struct var *
                     18: var_set1(head, name, v)
                     19: struct var **head;
                     20: char *name;
                     21: struct value *v;
                     22: {
                     23:        register struct var **p;
                     24:        register struct var *r;
                     25:        struct value val;
                     26: 
                     27:        /* do this first, easier to recover */
                     28:        val = *v;
                     29:        if (val.v_type == V_STR && val.v_str != 0 &&
                     30:            (val.v_str = str_cpy(val.v_str)) == 0)
                     31:                return 0;
                     32:        if (*(p = var_lookup1(head, name)) == 0) {
                     33:                r = (struct var *) malloc(sizeof (struct var));
                     34:                if (r == 0) {
                     35:                        val_free(val);
                     36:                        return 0;
                     37:                }
                     38:                if ((r->r_name = str_cpy(name)) == 0) {
                     39:                        val_free(val);
                     40:                        free((char *) r);
                     41:                        return 0;
                     42:                }
                     43:                r->r_left = r->r_right = 0;
                     44:                *p = r;
                     45:        } else {
                     46:                r = *p;
                     47:                val_free(r->r_val);
                     48:        }
                     49:        r->r_val = val;
                     50:        return r;
                     51: }
                     52: 
                     53: struct var *
                     54: var_setstr1(head, name, str)
                     55: struct var **head;
                     56: char *name;
                     57: char *str;
                     58: {
                     59:        struct value v;
                     60: 
                     61:        v.v_type = V_STR;
                     62:        v.v_str = str;
                     63:        return var_set1(head, name, &v);
                     64: }
                     65: 
                     66: struct var *
                     67: var_setnum1(head, name, num)
                     68: struct var **head;
                     69: char *name;
                     70: int num;
                     71: {
                     72:        struct value v;
                     73: 
                     74:        v.v_type = V_NUM;
                     75:        v.v_num = num;
                     76:        return var_set1(head, name, &v);
                     77: }
                     78: 
                     79: var_unset1(head, name)
                     80: struct var **head;
                     81: char *name;
                     82: {
                     83:        register struct var **p;
                     84:        register struct var *r;
                     85: 
                     86:        if (*(p = var_lookup1(head, name)) == 0)
                     87:                return -1;
                     88:        r = *p;
                     89:        *p = r->r_left;
                     90:        while (*p != 0)
                     91:                p = &(*p)->r_right;
                     92:        *p = r->r_right;
                     93:        val_free(r->r_val);
                     94:        str_free(r->r_name);
                     95:        free((char *) r);
                     96:        return 0;
                     97: }
                     98: 
                     99: struct var **
                    100: var_lookup1(p, name)
                    101: register struct var **p;
                    102: register char *name;
                    103: {
                    104:        register cmp;
                    105: 
                    106:        while (*p != 0) {
                    107:                if ((cmp = strcmp(name, (*p)->r_name)) < 0)
                    108:                        p = &(*p)->r_left;
                    109:                else if (cmp > 0)
                    110:                        p = &(*p)->r_right;
                    111:                else
                    112:                        break;
                    113:        }
                    114:        return p;
                    115: }
                    116: 
                    117: var_walk1(r, func, a)
                    118: register struct var *r;
                    119: int (*func)();
                    120: {
                    121:        if (r == 0)
                    122:                return 0;
                    123:        if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
                    124:            || var_walk1(r->r_right, func, a) < 0)
                    125:                return -1;
                    126:        return 0;
                    127: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.