22 int shell_readline(int fd, char *buf);
110 void clear_command(int count, char *buf)  in clear_command()  argument
114     memset(buf, 0, sizeof(buf));  in clear_command()
122 void change_command(char *buf, int type)  in change_command()  argument
141     strcpy(buf, history_commands[current_command_index]);  in change_command()
142     printf("%s", buf);  in change_command()
152 int shell_readline(int fd, char *buf)  in shell_readline()  argument
164             clear_command(count, buf);  in shell_readline()
167             change_command(buf, 1);  in shell_readline()
168             count = strlen(buf);  in shell_readline()
175             clear_command(count, buf);  in shell_readline()
178             change_command(buf, -1);  in shell_readline()
179             count = strlen(buf);  in shell_readline()
203                     buf[--count] = 0;  in shell_readline()
211                 buf[count++] = key;  in shell_readline()
219                 strcpy(history_commands[count_history], buf);  in shell_readline()
224                 strcpy(history_commands[current_command_index], buf);  in shell_readline()