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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdbool.h>
#ifndef STACK_H
#include "stack.h"
#endif
#ifndef OPTABLE_H
#include "optable.h"
#endif
bool isnumber(char *text) {
for(int j = strlen(text); j > 0; j--) {
if(text[j] < '0' && text[j] > '9') {
return false;
}
}
return true;
}
bool notdelim(char c) {
return c != ' ' && c != '\n' && c != '\t' && c != '\0';
}
void eval(stack* s, int len, char* line);
void exec(stack *s, char *word, int len, char* line, int* i) {
wordop* op = getop(word);
if (op) {
switch (op->optype) {
case script:
eval(s, op->scriptlen, op->script);
break;
case builtin:
op->op(s);
break;
case directive:
op->directive(s, len, line, i);
break;
}
} else if (isnumber(word)) {
push(s, atoi(word));
}
}
void eval(stack* s, int len, char* line) {
char word[WORD_LEN_LIMIT];
int wordi = 0;
for (int i = 0; i < len; i++) {
if (notdelim(line[i]) && wordi < WORD_LEN_LIMIT - 1) {
word[wordi++] = line[i];
} else { // end of word
if (wordi > 0) { // don't exec an empty string
word[wordi] = '\0';
exec(s, word, len, line, &i);
}
// start new word
wordi = 0;
}
// end of input string
if (line[i] == '\0') {
return;
}
}
}
int main(int argc, char** argv) {
stack* s = newstack();
char *line = NULL;
size_t len = 0;
ssize_t read;
while ((read = getline(&line, &len, stdin)) != -1) {
eval(s, len, line);
}
}
|
