1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
#include <parser.h>
#include <builtins.h>
#include "stack.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int s_put(interpreter *it)
{
char *s = igetarg_string(it, 0);
printf("%s", s);
return 0;
}
int s_type(interpreter *it)
{
variable *v = (variable *)it->stack[0];
switch (v->valtype) {
case STRING:
puts("string");
break;
case INTEGER:
puts("integer");
break;
case FLOAT:
puts("float");
break;
case FUNC:
puts("func");
break;
default:
puts("unknown");
break;
}
return 0;
}
int input(interpreter *it)
{
variable *v = igetarg(it, 0);
v->valtype = STRING;
v->svalue = malloc(128);
unsigned int unused;
getline(&v->svalue, &unused, stdin);
*strchr(v->svalue, '\n') = '\0';
return 0;
}
int concat(interpreter *it)
{
variable *v = igetarg(it, 0);
char *s = igetarg_string(it, 1);
char *new = malloc(strlen(v->svalue) + strlen(s) + 1);
strcpy(new, v->svalue);
strcpy(new + strlen(v->svalue), s);
new[strlen(v->svalue) + strlen(s)] = 0;
v->svalue = new;
return 0;
}
int quit(interpreter *it)
{
(void)it;
exit(0);
return 0;
}
int expr(interpreter *it)
{
variable *v = igetarg(it, 0);
variable *r = igetarg(it, 1);
int len = strlen(v->svalue);
char *s = malloc(len + 1);
strcpy(s, v->svalue);
s[len] = 0;
variable *q = idoexpr(it, s);
r->valtype = q->valtype;
r->value = q->value;
r->svalue = q->svalue;
return 0;
}
int main(int argc, char **argv)
{
interpreter interp;
if (argc != 2) {
printf("Usage: %s file\n", argv[0]);
return -1;
}
FILE *fp = fopen(argv[1], "r");
if (fp == 0) {
printf("Could not open file: %s\n", argv[1]);
return -1;
}
iinit(&interp);
inew_cfunc(&interp, "print", s_put);
inew_cfunc(&interp, "tp", s_type);
inew_cfunc(&interp, "q", quit);
inew_cfunc(&interp, "gets", input);
inew_cfunc(&interp, "concat", concat);
inew_cfunc(&interp, "expr", expr);
char *line = 0;
unsigned int size;
int result;
while (getline(&line, &size, fp) != -1) {
*strchr(line, '\n') = '\0';
result = idoline(&interp, line);
if (result != 0)
printf("Error: %d\n", result);
}
fclose(fp);
iend(&interp);
return 0;
}
|
