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
173                     clear_command(count, buf);  in shell_readline()
176                     change_command(buf, 1);  in shell_readline()
177                     count = strlen(buf);  in shell_readline()
187                     clear_command(count, buf);  in shell_readline()
190                     change_command(buf, -1);  in shell_readline()
191                     count = strlen(buf);  in shell_readline()
222                     buf[--count] = 0;  in shell_readline()
230                 buf[count++] = key;  in shell_readline()
238                 strcpy(history_commands[count_history], buf);  in shell_readline()
243                 strcpy(history_commands[current_command_index], buf);  in shell_readline()