13 |
if (argc == 1) { |
if (argc == 1) { |
14 |
fprintf(stderr, "Welcome to mini shell. Have fun!\n"); |
fprintf(stderr, "Welcome to mini shell. Have fun!\n"); |
15 |
run_commands(stdin, "> "); |
run_commands(stdin, "> "); |
|
} |
|
16 |
|
|
17 |
// scripting mode |
// scripting mode |
18 |
if (argc == 2) { |
} else if (argc == 2) { |
19 |
FILE * script = fopen(argv[1], "r"); |
FILE * script; |
20 |
|
script = fopen(argv[1], "r"); |
21 |
|
if (script == NULL) { |
22 |
|
perror(NULL); |
23 |
|
exit(EXIT_FAILURE); |
24 |
|
} |
25 |
run_commands(script, ""); |
run_commands(script, ""); |
26 |
fclose(script); |
fclose(script); |
27 |
|
|
28 |
|
} else { |
29 |
|
fprintf(stderr, "Sorry, mini shell just accepts one parameter: a path to a script!\n"); |
30 |
} |
} |
31 |
} |
} |
32 |
|
|
33 |
void run_commands(FILE * fp, char * prompt) { |
void run_commands(FILE * fp, char * prompt) { |
34 |
|
|
35 |
char command[MAX_COMMAND_LENGTH]; |
char command[MAX_COMMAND_LENGTH]; |
36 |
|
char *command_ptr; |
37 |
|
|
38 |
// echo first prompt |
// echo first prompt |
39 |
fprintf(stdout, "%s", prompt); |
fprintf(stdout, "%s", prompt); |
40 |
while (fgets(command, MAX_COMMAND_LENGTH, fp)) { |
while (fgets(command, MAX_COMMAND_LENGTH, fp)) { |
41 |
char *command_ptr = command; |
|
42 |
|
int error_number = ferror(fp); |
43 |
|
|
44 |
|
if (error_number) { |
45 |
|
char * message = strerror(error_number); |
46 |
|
fprintf(stderr, "Error while reading from input stream: %s", message); |
47 |
|
clearerr(fp); |
48 |
|
break; |
49 |
|
} |
50 |
|
|
51 |
|
command_ptr = command; |
52 |
|
|
53 |
// strip newlines |
// strip newlines |
54 |
chomp(command_ptr); |
chomp(command_ptr); |