Merge branch 'fatfs-integration' into fatcommands

[z180-stamp.git] / avr / command.c

/*
 * (C) Copyright 2014, 2016 Leo C. <erbl259-lmu@yahoo.de>
 *
 * (C) Copyright 2000-2009
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * SPDX-License-Identifier:	GPL-2.0
 */

/*
 *  Command Processor Table
 */

#include "command.h"
#include "common.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <setjmp.h>

#include "config.h"
#include "print-utils.h"
#include "con-utils.h"
#include "env.h"
#include "debug.h"


jmp_buf cmd_jbuf;


static void print_usage_line(const FLASH char *name, int width,
				const FLASH char *usage)
{
	width -= strlen_P(name);
	if (width < 0)
		width = 0;
	my_puts_P(name);
	print_blanks(width);
	my_puts_P(PSTR(" - "));
	my_puts_P(usage);
	my_puts_P(PSTR("\n"));
}

int strcmp_PP(const FLASH char *s1, const FLASH char *s2)
{
	unsigned char c1, c2;

	while ((c1 = *(const FLASH unsigned char *)s1++)
			== (c2 = *(const FLASH unsigned char *)s2++))
		if (c1 == 0)
			return 0;

	return c1 - c2;
}

int cmpstring_PP(const void *p1, const void *p2)
{
	return strcmp_PP((*(const FLASH cmd_tbl_t **) p1)->name,
		         (*(const FLASH cmd_tbl_t **) p2)->name);
}

/****************************************************************************/

int cmd_tbl_item_count(cmd_tbl_t *p)
{
	int count = 0;

	while (p->name != NULL) {
		p++; count++;
	}
	return count;
}


cmd_tbl_t *get_cmd_tbl_base(cmd_tbl_t  *cmdtp)
{
	cmd_tbl_t *p = cmdtp;

	while (p->name != NULL)
		++p;

	return p->subcmd;
}

/*
 * find command table entry for a command
 */
typedef struct {
		size_t len;
		uint_fast8_t level;
		bool opt_debug;
	} find_cmd_para_t;

cmd_tbl_t *_find_cmd (const char *cmd, cmd_tbl_t *table, find_cmd_para_t *para)
{
	cmd_tbl_t *cmdtp_ret = NULL;
	uint_fast8_t n_found = 0, sub_found = 0;

	for (cmd_tbl_t *cmdtp = table; cmdtp->name != NULL; cmdtp++) {
		if (strncmp_P(cmd, cmdtp->name, para->len) == 0 &&
					(para->opt_debug || !(cmdtp->flags & CTBL_DBG))) {
			if (para->len == strlen_P(cmdtp->name))
				return cmdtp;	/* full match */

			cmdtp_ret = cmdtp;	/* abbreviated command ? */
			n_found++;
		} else if (cmdtp->subcmd && cmdtp->flags & CTBL_SUBCMDAUTO) {
			cmd_tbl_t *sub = _find_cmd(cmd, cmdtp->subcmd, para);
			if (sub) {
				cmdtp_ret = sub;
				++n_found;
			}
		}
	}
	if (n_found == 1) {			/* exactly one match */
		if (sub_found)
			para->level++;
		return cmdtp_ret;
	}

	return NULL;	/* not found or ambiguous command */
}


cmd_tbl_t *find_cmd (const char *cmd, cmd_tbl_t *table, uint_fast8_t *cmdlevel)
{
	find_cmd_para_t para;

	if (!cmd)
		return NULL;

	char *optenv = getenv_str(PSTR("cmd"));
	para.level = 0;
	para.opt_debug = optenv && strstr_P(optenv, PSTR("debug")) != NULL;
	para.len = strlen(cmd);

	cmd_tbl_t *cmdtp = _find_cmd(cmd, table, &para);

	if (cmdlevel)
		*cmdlevel = para.level;
	return cmdtp;
}

cmd_tbl_t *find_cmd_sub(const char *cmd, cmd_tbl_t *table)
{
	cmd_tbl_t *entry = NULL;

	for (cmd_tbl_t *tp = get_cmd_tbl_base(table); tp->name && entry == NULL; tp++)
		if (tp->subcmd && tp->flags & CTBL_SUBCMDAUTO)
			entry = find_cmd(cmd, tp->subcmd, NULL);

	return entry;
}

/*
 * Use puts() instead of printf() to avoid printf buffer overflow
 * for long help messages
 */

command_ret_t do_help(cmd_tbl_t *cmdtp, uint_fast8_t flag UNUSED, int argc, char * const argv[])
{
	cmd_tbl_t *tbl_start = get_cmd_tbl_base(cmdtp);

	char *optenv = getenv_str(PSTR("cmd"));
	bool opt_debug = optenv && strstr_P(optenv, PSTR("debug")) != NULL;

	if (argc == 1) {	/*show list of commands */
		int cmd_items = cmd_tbl_item_count(tbl_start);
		cmd_tbl_t **cmd_list = (cmd_tbl_t **) malloc(cmd_items * sizeof(cmd_tbl_t *));
		uint_fast8_t maxlen_cmd = 0;

		/* Make array of commands */
		cmd_tbl_t *tp = tbl_start;
		for (int i = 0; i < cmd_items; i++) {
			uint_fast8_t l = strlen_P(tp->name);
			if (l > maxlen_cmd)
				maxlen_cmd = l;
			cmd_list[i] = tp++;
		}
		/* Sort command list */
		qsort(cmd_list, cmd_items, sizeof (cmd_tbl_t *), cmpstring_PP);

		/* print short help (usage) */
		for (int i = 0; i < cmd_items; i++) {
			if (opt_debug || !(cmd_list[i]->flags & CTBL_DBG)) {
				const FLASH char *usage = cmd_list[i]->usage;

				/* allow user abort */
				if (ctrlc ()) {
					free(cmd_list);
					return CMD_RET_FAILURE;
				}
				if (usage == NULL)
					continue;
#if defined(GCC_BUG_61443) || 1
				print_usage_line(cmd_list[i]->name, maxlen_cmd, usage);
#else
				printf_P(PSTR("%-" stringify(8) /*FIXME*/ "S - %S\n"),
						cmd_list[i]->name, usage);
#endif
			}
		}
		free(cmd_list);
		return CMD_RET_SUCCESS;
	}

	/*
	 * command help (long version)
	 */
	for (uint8_t i = 1; i < argc; ++i) {
		if ((cmdtp = find_cmd(argv[i], tbl_start, NULL)) != NULL &&
					(opt_debug || cmdtp->name[0] != '!')) {
			cmd_usage(cmdtp);
		} else {
			printf_P(PSTR("Unknown command '%s' - try 'help'"
				" without arguments.\n\n"), argv[i]
				);
			return CMD_RET_FAILURE;
		}
	}

	return CMD_RET_SUCCESS;
}


command_ret_t cmd_usage(const FLASH cmd_tbl_t *cmdtp)
{
//	printf("%s - %s\n\n", cmdtp->name, cmdtp->usage);
	print_usage_line(cmdtp->name, 0, cmdtp->usage);
#if 0
	my_puts_P(cmdtp->name);
	print_blanks(/*FIXME*/ 8 - strlen_P(cmdtp->name));
	my_puts_P(PSTR(" - "));
	my_puts_P(cmdtp->usage);
	my_puts_P(PSTR("\n\n"));
#endif
#ifdef	CONFIG_SYS_LONGHELP
//	printf("Usage:\n%s ", cmdtp->name);
	my_puts_P(PSTR("Usage:\n"));
	my_puts_P(cmdtp->name);
	my_puts_P(PSTR(" "));

	if (!cmdtp->help) {
		my_puts_P(PSTR(" - No additional help available.\n"));
		return CMD_RET_FAILURE;
	}

	my_puts_P(cmdtp->help);
	my_puts_P(PSTR("\n"));
#endif	/* CONFIG_SYS_LONGHELP */
	return CMD_RET_FAILURE;
}

#ifdef CONFIG_AUTO_COMPLETE

int var_complete(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
{
	static char tmp_buf[CONFIG_SYS_CBSIZE];
	int space;

	space = last_char == '\0' || isblank(last_char);

	if (space && argc == 1)
		return env_complete("", maxv, cmdv, sizeof(tmp_buf), tmp_buf);

	if (!space && argc == 2)
		return env_complete(argv[1], maxv, cmdv, sizeof(tmp_buf), tmp_buf);

	return 0;
}

/*************************************************************************************/

/* TODO: cmdtp points to FLASH */

static int complete_cmdv(int argc, char * const argv[], char last_char, int maxv, char *cmdv[])
{
	cmd_tbl_t *cmdtp = cmd_tbl;
//	const int count = ARRAY_SIZE(cmd_tbl);
//	const cmd_tbl_t *cmdend = cmdtp + count;
//	const char *p;
	int len, clen;
	int n_found = 0;
	const char *cmd;

	/* sanity? */
	if (maxv < 2)
		return -2;

	cmdv[0] = NULL;

	if (argc == 0) {
		/* output full list of commands */
		for (; cmdtp->name[0] != '\0'; cmdtp++) {
			if (n_found >= maxv - 2) {
				cmdv[n_found++] = "...";
				break;
			}
			cmdv[n_found++] = cmdtp->name;
		}
		cmdv[n_found] = NULL;
		return n_found;
	}

	/* more than one arg or one but the start of the next */
	if (argc > 1 || (last_char == '\0' || isblank(last_char))) {
		cmdtp = find_cmd(argv[0], cmd_tbl);
		if (cmdtp == NULL || cmdtp->complete == NULL) {
			cmdv[0] = NULL;
			return 0;
		}
		return (*cmdtp->complete)(argc, argv, last_char, maxv, cmdv);
	}

	cmd = argv[0];

	len = strlen(cmd);

	/* return the partial matches */
	for (; cmdtp->name[0] != '\0'; cmdtp++) {

		clen = strlen(cmdtp->name);
		if (clen < len)
			continue;

		if (memcmp(cmd, cmdtp->name, len) != 0)
			continue;

		/* too many! */
		if (n_found >= maxv - 2) {
			cmdv[n_found++] = "...";
			break;
		}

		cmdv[n_found++] = cmdtp->name;
	}

	cmdv[n_found] = NULL;
	return n_found;
}

static int make_argv(char *s, int argvsz, char *argv[])
{
	int argc = 0;

	/* split into argv */
	while (argc < argvsz - 1) {

		/* skip any white space */
		while (isblank(*s))
			++s;

		if (*s == '\0')	/* end of s, no more args	*/
			break;

		argv[argc++] = s;	/* begin of argument string	*/

		/* find end of string */
		while (*s && !isblank(*s))
			++s;

		if (*s == '\0')		/* end of s, no more args	*/
			break;

		*s++ = '\0';		/* terminate current arg	 */
	}
	argv[argc] = NULL;

	return argc;
}

static void print_argv(const char *banner, const char *leader, const char *sep, int linemax, char * const argv[])
{
	int ll = leader != NULL ? strlen(leader) : 0;
	int sl = sep != NULL ? strlen(sep) : 0;
	int len, i;

	if (banner) {
		my_puts_P(PSTR("\n"));
		my_puts(banner);
	}

	i = linemax;	/* force leader and newline */
	while (*argv != NULL) {
		len = strlen(*argv) + sl;
		if (i + len >= linemax) {
			my_puts_P(PSTR("\n"));
			if (leader)
				my_puts(leader);
			i = ll - sl;
		} else if (sep)
			my_puts(sep);
		my_puts(*argv++);
		i += len;
	}
	my_puts_P(PSTR("\n"));
}

static int find_common_prefix(char * const argv[])
{
	int i, len;
	char *anchor, *s, *t;

	if (*argv == NULL)
		return 0;

	/* begin with max */
	anchor = *argv++;
	len = strlen(anchor);
	while ((t = *argv++) != NULL) {
		s = anchor;
		for (i = 0; i < len; i++, t++, s++) {
			if (*t != *s)
				break;
		}
		len = s - anchor;
	}
	return len;
}

static char tmp_buf[CONFIG_SYS_CBSIZE];	/* copy of console I/O buffer	*/


int cmd_auto_complete(const FLASH char *const prompt, char *buf, int *np, int *colp)
{
	int n = *np, col = *colp;
	char *argv[CONFIG_SYS_MAXARGS + 1];		/* NULL terminated	*/
	char *cmdv[20];
	char *s, *t;
	const char *sep;
	int i, j, k, len, seplen, argc;
	int cnt;
	char last_char;

	if (strcmp_PP(prompt, CONFIG_SYS_PROMPT) != 0)
		return 0;	/* not in normal console */

	cnt = strlen(buf);
	if (cnt >= 1)
		last_char = buf[cnt - 1];
	else
		last_char = '\0';

	/* copy to secondary buffer which will be affected */
	strcpy(tmp_buf, buf);

	/* separate into argv */
	argc = make_argv(tmp_buf, sizeof(argv)/sizeof(argv[0]), argv);

	/* do the completion and return the possible completions */
	i = complete_cmdv(argc, argv, last_char, sizeof(cmdv)/sizeof(cmdv[0]), cmdv);

	/* no match; bell and out */
	if (i == 0) {
		if (argc > 1)	/* allow tab for non command */
			return 0;
		putchar('\a');
		return 1;
	}

	s = NULL;
	len = 0;
	sep = NULL;
	seplen = 0;
	if (i == 1) { /* one match; perfect */
		k = strlen(argv[argc - 1]);
		s = cmdv[0] + k;
		len = strlen(s);
		sep = " ";
		seplen = 1;
	} else if (i > 1 && (j = find_common_prefix(cmdv)) != 0) {	/* more */
		k = strlen(argv[argc - 1]);
		j -= k;
		if (j > 0) {
			s = cmdv[0] + k;
			len = j;
		}
	}

	if (s != NULL) {
		k = len + seplen;
		/* make sure it fits */
		if (n + k >= CONFIG_SYS_CBSIZE - 2) {
			putchar('\a');
			return 1;
		}

		t = buf + cnt;
		for (i = 0; i < len; i++)
			*t++ = *s++;
		if (sep != NULL)
			for (i = 0; i < seplen; i++)
				*t++ = sep[i];
		*t = '\0';
		n += k;
		col += k;
		my_puts(t - k);
		if (sep == NULL)
			putchar('\a');
		*np = n;
		*colp = col;
	} else {
		print_argv(NULL, "  ", " ", 78, cmdv);

		my_puts_P(prompt);
		my_puts(buf);
	}
	return 1;
}

#endif /* CONFIG_AUTO_COMPLETE */



/**
 * Call a command function. This should be the only route in U-Boot to call
 * a command, so that we can track whether we are waiting for input or
 * executing a command.
 *
 * @param cmdtp		Pointer to the command to execute
 * @param flag		Some flags normally 0 (see CMD_FLAG_.. above)
 * @param argc		Number of arguments (arg 0 must be the command text)
 * @param argv		Arguments
 * @return 0 if command succeeded, else non-zero (CMD_RET_...)
 */
command_ret_t cmd_call(cmd_tbl_t *cmdtp, uint_fast8_t flag, int argc, char * const argv[])
{
	command_ret_t result;

	result = (cmdtp->cmd)(cmdtp, flag, argc, argv);
//	if (result != CMD_RET_SUCCESS)
//		debug("Command failed, result=%d\n", result);
	return result;
}

#pragma GCC diagnostic ignored "-Wclobbered"

command_ret_t cmd_process(uint_fast8_t flag, int argc, char * const argv[],
			       uint_fast8_t *repeatable)
{
	command_ret_t rc = CMD_RET_SUCCESS;
	cmd_tbl_t *cmdtp;
	uint_fast8_t cmdlevel;

	/* Look up command in command table */
	cmdtp = find_cmd(argv[0], cmd_tbl, &cmdlevel);
	if (cmdtp != NULL) {
		/* Check if this command has subcommands */
		if (cmdtp->subcmd && argc > 1) {

			/* Look up subcommand in subcommand table */
			cmd_tbl_t *cmdtpsub = find_cmd(argv[1], cmdtp->subcmd, &cmdlevel);
			if (cmdtpsub == NULL) {
				printf_P(PSTR("Unknown '%s' subcommand '%s' - try '%s help'\n"), argv[0], argv[1], argv[0]);
				return CMD_RET_FAILURE;
			}
			cmdtp = cmdtpsub;
			--argc;
			++argv;
		}
	}
#if 0
	 else {
		/* Search subcommands */
		cmdtp = find_cmd_sub(argv[0], cmd_tbl, &cmdlevel);
	}
#endif

	if (cmdtp == NULL) {
		printf_P(PSTR("Unknown command '%s' - try 'help'\n"), argv[0]);
		return CMD_RET_FAILURE;
	}

	/* found - check max args */
	if (argc > cmdtp->maxargs)
		rc = CMD_RET_USAGE;

#if defined(CONFIG_CMD_BOOTD)
	/* avoid "bootd" recursion */
	else if (cmdtp->cmd == do_bootd) {
		if (flag & CMD_FLAG_BOOTD) {
			my_puts_P(PSTR("'bootd' recursion detected\n"));
			rc = CMD_RET_FAILURE;
		} else {
			flag |= CMD_FLAG_BOOTD;
		}
	}
#endif

	if (setjmp(cmd_jbuf) != 0)
		return CMD_RET_FAILURE;

	/* If OK so far, then do the command */
	if (!rc) {
		rc = cmd_call(cmdtp, flag, argc, argv);
		*repeatable &= (cmdtp->flags & CTBL_RPT) != 0;
	}
	if (rc == CMD_RET_USAGE)
		rc = cmd_usage(cmdtp);
	return rc;
}

int cmd_process_error(cmd_tbl_t *cmdtp, int err)
{
	char buf[strlen_P(cmdtp->name) + 1];
	strcpy_P(buf, cmdtp->name);

	if (err) {
		printf_P(PSTR("Command '%s' failed: Error %d\n"), buf, err);
		return 1;
	}

	return 0;
}