int main(int argc, char *argv[], char *envp[])
{
int write_bytes;
char exec_file_name[STRING_MAX];
char path_str[STRING_MAX];
int flag_exit;
int exec_status;
int index;
int fd;
pid_t pid;
signal(SIGINT, SIG_IGN);
signal(SIGINT, handle_signal);
read_bytes = STRING_MAX;
fflush(stdout);
get_path_string(envp, path_str);
insert_path_str_to_search(path_str);
do {
memset(exec_file_name, 0, read_bytes);
write_bytes = write(1, MESS_BASH_WAIT_COMMAND,
sizeof(MESS_BASH_WAIT_COMMAND));
read_bytes = 1;
read_bytes = read(0, exec_file_name, STRING_MAX);
if (read_bytes != 1) {
exec_file_name[read_bytes-1] = 0;
flag_exit = strcmp(exec_file_name, COMMAND_BASH_CLOSE);
if (flag_exit)
switch (pid = fork()) {
case -1:
perror("fork");
exit(1);
case 0:
fill_argv(exec_file_name);
if (argv_child[0][0] != '/') {
fd = open(argv_child[0], O_RDONLY);
if (fd > 0) {
close(fd);
} else if (attach_path() != 0) {
printf("0 %s: %s\n",
argv_child[0],
MESS_BASH_COMMAND_MISS);
exit(1);
}
} else {
fd = open(argv_child[0], O_RDONLY);
if (fd > 0) {
close(fd);
} else {
printf("1 %s: %s\n",
argv_child[0],
MESS_BASH_COMMAND_MISS);
exit(1);
}
}
exec_status = execve(argv_child[0],
argv_child, envp);
if (exec_status < 0) {
printf("2 %s: %s\n",
argv_child[0],
MESS_BASH_COMMAND_MISS);
exit(1);
}
exit(0);
default:
wait(NULL);
}
}
} while (flag_exit);
for (index = 0; argv_child[index] != NULL; index++)
free(argv_child[index]);
for (index = 0; search_path[index] != NULL; index++)
free(search_path[index]);
write_bytes = write(1, MESS_BASH_NL, sizeof(MESS_BASH_NL));
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
int fd, i;
char c;
char *inputs = calloc(BUFFERSIZE, sizeof(char));
char *cmd = calloc(BUFFERSIZE, sizeof(char));
char *path_str = calloc(BUFFERSIZE, sizeof(char));
// use ctrl+c to interrupt whatever the shell is doing
signal(SIGINT, SIG_IGN);
signal(SIGINT, sig_hdlr);
get_paths(envp);
if(fork() == 0) {
execve("/usr/bin/clear", argv, envp);
exit(1);
} else {
wait(NULL);
}
// Print the prompt string for the first time
printf("$ ");
fflush(stdout);
// Main loop
while(c != EOF) {
c = getchar();
switch(c) {
case '\n':
if(inputs[0] == NULL_SYMBOL) {
printf("$ ");
} else {
// Parse the command line
argv_parser(inputs);
strncpy(cmd, parsed_argv[0], strlen(parsed_argv[0]));
strncat(cmd, "\0", 1);
if(strchr(cmd, '/') == NULL) {
// Find the full pathname for the file
if(attach_path(cmd) == 0) {
// Create a process to execute the command
run_cmd(cmd, envp);
} else {
printf("%s: command not found\n", cmd);
}
} else {
if((fd = open(cmd, O_RDONLY)) == -1) {
close(fd);
run_cmd(cmd, envp);
} else {
printf("%s: command not found\n", cmd);
}
}
// Parent waits until child finishes executing command
// ????????????
argv_reset();
// Print the prompt string
printf("$ ");
memset(cmd, 0, BUFFERSIZE);
}
memset(inputs, 0, BUFFERSIZE);
break;
default:
// Read the command line
strncat(inputs, &c, 1);
// printf("%s\n", inputs);
break;
}
}
free(inputs);
free(path_str);
for(i=0; i < BUFFERSIZE; i++)
free(paths[i]);
printf("\n");
return 0;
}
