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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include "array.h"
#include <stdbool.h>
void print_prompt();
int parse_line(char const *line, char ***parts, size_t *part_count);
// returns the return code of the executed program
int exec_command(const char *path, char *const argv[], unsigned timeout);
int main(int argc, char* argv[]) {
bool done = false;
while (!done) {
char *line = NULL;
size_t cap = 0;
size_t length = 0;
print_prompt();
if ((length = getline(&line, &cap, stdin)) < 0) {
fprintf(stderr, "Failed to read from STDIN");
exit(-1);
}
line[length - 1] = '\0'; // cut the line feed
char **arguments = NULL;
size_t argument_count;
parse_line(line, &arguments, &argument_count);
if (strcmp(arguments[0], "cd") == 0) {
if (arrayLen(arguments) != 3) {
fprintf(stderr, "usage: cd <path>");
goto clean;
}
int ret = chdir(arguments[1]);
if (ret)
printf("[%i] ", ret);
} else if (strcmp(arguments[0], "exit") == 0) {
done = true;
} else {
int ret = exec_command(arguments[0], arguments, 0);
if (ret)
printf("[%i] ", ret);
}
clean:
free((void *)line);
while (arrayLen(arguments) > 0) {
char *tmp = arrayPop(arguments);
if (tmp)
arrayRelease(tmp);
}
arrayRelease(arguments);
}
}
int parse_line(char const *line, char ***parts, size_t *part_count) {
char *part;
char **local_parts;
arrayInit(part);
arrayInit(local_parts);
/* if (arrayInit(part) != 0 || arrayInit(local_parts) != 0) {
fprintf(stderr, "Failed to prepare new part array");
exit(-1);
}*/
char c;
int i = 0;
while (true) {
c = line[i++];
if (c == ' ' || c == '\0') {
arrayPush(part) = '\0';
arrayPush(local_parts) = part;
if (c == '\0') {
arrayPush(local_parts) = NULL;
break;
} else {
arrayInit(part);
}
} else {
arrayPush(part) = c;
}
}
*part_count = arrayLen(local_parts);
*parts = local_parts;
return 0;
}
void print_prompt() {
size_t length = 1024;
char *buffer = malloc(length * sizeof(char));
getcwd(buffer, length);
if (buffer == NULL) {
printf(".> ");
} else {
printf("%s > ", buffer);
}
}
int exec_command(const char *path, char *const argv[], unsigned timeout) {
int pid;
int pipefd[2];
int status;
char buf[512];
pipe(pipefd);
if ((pid = fork()) == 0) {
close(pipefd[0]);
dup2(pipefd[1], 1); // includes close(1);
close(pipefd[1]);
execvp(path, argv);
fprintf(stderr, "could not execute \"%s\"\n", path);
exit(-1);
}
if (pid < 0) {
fprintf(stderr, "no fork\n");
exit(-2);
}
close(pipefd[1]);
size_t length = 0;
while ((length = read(pipefd[0], buf, 10)) > 0) {
buf[length] = '\0';
printf("%s", buf);
}
waitpid(pid, &status, 0);
close(pipefd[0]);
return WEXITSTATUS(status);
}
|
