1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * (C) Copyright 2014 Google, Inc
4 * Simon Glass <sjg@chromium.org>
13 * struct cli_ch_state - state information for reading cmdline characters
15 * @esc_len: Number of escape characters read so far
16 * @esc_save: Escape characters collected so far
17 * @emit_upto: Next character to emit from esc_save (0 if not emitting)
26 * Go into the command loop
28 * This will return if we get a timeout waiting for a command. See
29 * CONFIG_BOOT_RETRY_TIME.
31 void cli_simple_loop(void);
34 * cli_simple_run_command() - Execute a command with the simple CLI
36 * @cmd: String containing the command to execute
37 * @flag Flag value - see CMD_FLAG_...
38 * Return: 1 - command executed, repeatable
39 * 0 - command executed but not repeatable, interrupted commands are
40 * always considered not repeatable
41 * -1 - not executed (unrecognized, bootd recursion or too many args)
42 * (If cmd is NULL or "" or longer than CONFIG_SYS_CBSIZE-1 it is
43 * considered unrecognized)
45 int cli_simple_run_command(const char *cmd, int flag);
48 * cli_simple_process_macros() - Expand $() and ${} format env. variables
50 * @param input Input string possible containing $() / ${} vars
51 * @param output Output string with $() / ${} vars expanded
52 * @param max_size Maximum size of @output (including terminator)
53 * Return: 0 if OK, -ENOSPC if we ran out of space in @output
55 int cli_simple_process_macros(const char *input, char *output, int max_size);
58 * cli_simple_run_command_list() - Execute a list of command
60 * The commands should be separated by ; or \n and will be executed
61 * by the built-in parser.
63 * This function cannot take a const char * for the command, since if it
64 * finds newlines in the string, it replaces them with \0.
66 * @param cmd String containing list of commands
67 * @param flag Execution flags (CMD_FLAG_...)
68 * Return: 0 on success, or != 0 on error.
70 int cli_simple_run_command_list(char *cmd, int flag);
73 * cli_readline() - read a line into the console_buffer
75 * This is a convenience function which calls cli_readline_into_buffer().
77 * @prompt: Prompt to display
78 * Return: command line length excluding terminator, or -ve on error
80 int cli_readline(const char *const prompt);
83 * readline_into_buffer() - read a line into a buffer
85 * Display the prompt, then read a command line into @buffer. The
86 * maximum line length is CONFIG_SYS_CBSIZE including a \0 terminator, which
87 * will always be added.
89 * The command is echoed as it is typed. Command editing is supported if
90 * CONFIG_CMDLINE_EDITING is defined. Tab auto-complete is supported if
91 * CONFIG_AUTO_COMPLETE is defined. If CONFIG_BOOT_RETRY_TIME is defined,
92 * then a timeout will be applied.
94 * If CONFIG_BOOT_RETRY_TIME is defined and retry_time >= 0,
95 * time out when time goes past endtime (timebase time in ticks).
97 * @prompt: Prompt to display
98 * @buffer: Place to put the line that is entered
99 * @timeout: Timeout in milliseconds, 0 if none
100 * Return: command line length excluding terminator, or -ve on error: of the
101 * timeout is exceeded (either CONFIG_BOOT_RETRY_TIME or the timeout
102 * parameter), then -2 is returned. If a break is detected (Ctrl-C) then
105 int cli_readline_into_buffer(const char *const prompt, char *buffer,
109 * parse_line() - split a command line down into separate arguments
111 * The argv[] array is filled with pointers into @line, and each argument
112 * is terminated by \0 (i.e. @line is changed in the process unless there
113 * is only one argument).
115 * #argv is terminated by a NULL after the last argument pointer.
117 * At most CONFIG_SYS_MAXARGS arguments are permited - if there are more
118 * than that then an error is printed, and this function returns
119 * CONFIG_SYS_MAXARGS, with argv[] set up to that point.
121 * @line: Command line to parse
122 * @args: Array to hold arguments
123 * Return: number of arguments
125 int cli_simple_parse_line(char *line, char *argv[]);
127 #if CONFIG_IS_ENABLED(OF_CONTROL)
129 * cli_process_fdt() - process the boot command from the FDT
131 * If bootcmmd is defined in the /config node of the FDT, we use that
132 * as the boot command. Further, if bootsecure is set to 1 (in the same
133 * node) then we return true, indicating that the command should be executed
134 * as securely as possible, avoiding the CLI parser.
136 * @cmdp: On entry, the command that will be executed if the FDT does
137 * not have a command. Returns the command to execute after
139 * Return: true to execute securely, else false
141 bool cli_process_fdt(const char **cmdp);
143 /** cli_secure_boot_cmd() - execute a command as securely as possible
145 * This avoids using the parser, thus executing the command with the
146 * smallest amount of code. Parameters are not supported.
148 void cli_secure_boot_cmd(const char *cmd);
150 static inline bool cli_process_fdt(const char **cmdp)
155 static inline void cli_secure_boot_cmd(const char *cmd)
158 #endif /* CONFIG_OF_CONTROL */
161 * Go into the command loop
163 * This will return if we get a timeout waiting for a command, but only for
164 * the simple parser (not hush). See CONFIG_BOOT_RETRY_TIME.
168 /** Set up the command line interpreter ready for action */
171 #define endtick(seconds) (get_ticks() + (uint64_t)(seconds) * get_tbclk())
172 #define CTL_CH(c) ((c) - 'a' + 1)
175 * cli_ch_init() - Set up the initial state to process input characters
177 * @cch: State to set up
179 void cli_ch_init(struct cli_ch_state *cch);
182 * cli_ch_process() - Process an input character
184 * When @ichar is 0, this function returns any characters from an invalid escape
185 * sequence which are still pending in the buffer
187 * Otherwise it processes the input character. If it is an escape character,
188 * then an escape sequence is started and the function returns 0. If we are in
189 * the middle of an escape sequence, the character is processed and may result
190 * in returning 0 (if more characters are needed) or a valid character (if
191 * @ichar finishes the sequence).
193 * If @ichar is a valid character and there is no escape sequence in progress,
194 * then it is returned as is.
196 * If the Enter key is pressed, '\n' is returned.
198 * Usage should be like this::
200 * struct cli_ch_state cch;
207 * ichar = cli_ch_process(cch, 0);
210 * ichar = cli_ch_process(cch, ch);
212 * (handle the ichar character)
215 * If tstc() is used to look for keypresses, this function can be called with
216 * @ichar set to -ETIMEDOUT if there is no character after 5-10ms. This allows
217 * the ambgiuity between the Escape key and the arrow keys (which generate an
218 * escape character followed by other characters) to be resolved.
220 * @cch: Current state
221 * @ichar: Input character to process, or 0 if none, or -ETIMEDOUT if no
222 * character has been received within a small number of milliseconds (this
223 * cancels any existing escape sequence and allows pressing the Escape key to
225 * Returns: Resulting input character after processing, 0 if none, '\e' if
226 * an existing escape sequence was cancelled
228 int cli_ch_process(struct cli_ch_state *cch, int ichar);