path: root/src/systemcmds/param/param.c

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/**
 * @file param.c
 * @author Lorenz Meier <lm@inf.ethz.ch>
 *
 * Parameter tool.
 */

#include <nuttx/config.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>

#include <arch/board/board.h>

#include "systemlib/systemlib.h"
#include "systemlib/param/param.h"
#include "systemlib/err.h"

__EXPORT int param_main(int argc, char *argv[]);

static void	do_save(const char* param_file_name);
static void	do_load(const char* param_file_name);
static void	do_import(const char* param_file_name);
static void	do_show(const char* search_string);
static void	do_show_print(void *arg, param_t param);
static void	do_set(const char* name, const char* val, bool fail_on_not_found);
static void	do_compare(const char* name, const char* vals[], unsigned comparisons);
static void	do_reset(void);
static void	do_reset_nostart(void);

int
param_main(int argc, char *argv[])
{
	if (argc >= 2) {
		if (!strcmp(argv[1], "save")) {
			if (argc >= 3) {
				do_save(argv[2]);
			} else {
				if (param_save_default()) {
					warnx("Param export failed.");
					exit(1);
				} else {
					exit(0);
				}
			}
		}

		if (!strcmp(argv[1], "load")) {
			if (argc >= 3) {
				do_load(argv[2]);
			} else {
				do_load(param_get_default_file());
			}
		}

		if (!strcmp(argv[1], "import")) {
			if (argc >= 3) {
				do_import(argv[2]);
			} else {
				do_import(param_get_default_file());
			}
		}

		if (!strcmp(argv[1], "select")) {
			if (argc >= 3) {
				param_set_default_file(argv[2]);
			} else {
				param_set_default_file(NULL);
			}
			warnx("selected parameter default file %s", param_get_default_file());
			exit(0);
		}

		if (!strcmp(argv[1], "show")) {
			if (argc >= 3) {
				do_show(argv[2]);
			} else {
				do_show(NULL);
			}
		}

		if (!strcmp(argv[1], "set")) {
			if (argc >= 5) {

				/* if the fail switch is provided, fails the command if not found */
				bool fail = !strcmp(argv[4], "fail");

				do_set(argv[2], argv[3], fail);

			} else if (argc >= 4) {
				do_set(argv[2], argv[3], false);
			} else {
				errx(1, "not enough arguments.\nTry 'param set PARAM_NAME 3 [fail]'");
			}
		}

		if (!strcmp(argv[1], "compare")) {
			if (argc >= 4) {
				do_compare(argv[2], &argv[3], argc - 3);
			} else {
				errx(1, "not enough arguments.\nTry 'param compare PARAM_NAME 3'");
			}
		}

		if (!strcmp(argv[1], "reset")) {
			do_reset();
		}

		if (!strcmp(argv[1], "reset_nostart")) {
			do_reset_nostart();
		}
	}
	
	errx(1, "expected a command, try 'load', 'import', 'show', 'set', 'compare', 'select' or 'save'");
}

static void
do_save(const char* param_file_name)
{
	/* create the file */
	int fd = open(param_file_name, O_WRONLY | O_CREAT);

	if (fd < 0)
		err(1, "opening '%s' failed", param_file_name);

	int result = param_export(fd, false);
	close(fd);

	if (result < 0) {
		(void)unlink(param_file_name);
		errx(1, "error exporting to '%s'", param_file_name);
	}

	exit(0);
}

static void
do_load(const char* param_file_name)
{
	int fd = open(param_file_name, O_RDONLY);

	if (fd < 0)
		err(1, "open '%s'", param_file_name);

	int result = param_load(fd);
	close(fd);

	if (result < 0) {
		errx(1, "error importing from '%s'", param_file_name);
	}

	exit(0);
}

static void
do_import(const char* param_file_name)
{
	int fd = open(param_file_name, O_RDONLY);

	if (fd < 0)
		err(1, "open '%s'", param_file_name);

	int result = param_import(fd);
	close(fd);

	if (result < 0)
		errx(1, "error importing from '%s'", param_file_name);

	exit(0);
}

static void
do_show(const char* search_string)
{
	printf(" + = saved, * = unsaved\n");
	param_foreach(do_show_print, search_string, false);

	exit(0);
}

static void
do_show_print(void *arg, param_t param)
{
	int32_t i;
	float f;
	const char *search_string = (const char*)arg;
	const char *p_name = (const char*)param_name(param);

	/* print nothing if search string is invalid and not matching */
	if (!(arg == NULL)) {

		/* start search */
		char *ss = search_string;
		char *pp = p_name;
		bool mismatch = false;

		/* XXX this comparison is only ok for trailing wildcards */
		while (*ss != '\0' && *pp != '\0') {

			if (*ss == *pp) {
				ss++;
				pp++;
			} else if (*ss == '*') {
				if (*(ss + 1) != '\0') {
					warnx("* symbol only allowed at end of search string.");
					exit(1);
				}

				pp++;
			} else {
				/* param not found */
				return;
			}
		}

		/* the search string must have been consumed */
		if (!(*ss == '\0' || *ss == '*'))
			return;
	}

	printf("%c %s: ",
	       param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
	       param_name(param));

	/*
	 * This case can be expanded to handle printing common structure types.
	 */

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {
			printf("%d\n", i);
			return;
		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {
			printf("%4.4f\n", (double)f);
			return;
		}

		break;

	case PARAM_TYPE_STRUCT ... PARAM_TYPE_STRUCT_MAX:
		printf("<struct type %d size %u>\n", 0 + param_type(param), param_size(param));
		return;

	default:
		printf("<unknown type %d>\n", 0 + param_type(param));
		return;
	}

	printf("<error fetching parameter %d>\n", param);
}

static void
do_set(const char* name, const char* val, bool fail_on_not_found)
{
	int32_t i;
	float f;
	param_t param = param_find(name);

	/* set nothing if parameter cannot be found */
	if (param == PARAM_INVALID) {
		/* param not found - fail silenty in scripts as it prevents booting */
		errx(((fail_on_not_found) ? 1 : 0), "Error: Parameter %s not found.", name);
	}

	printf("%c %s: ",
	       param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
	       param_name(param));

	/*
	 * Set parameter if type is known and conversion from string to value turns out fine
	 */

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {
			printf("curr: %d", i);

			/* convert string */
			char* end;
			i = strtol(val,&end,10);
			param_set(param, &i);
			printf(" -> new: %d\n", i);

		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {
			printf("curr: %4.4f", (double)f);

			/* convert string */
			char* end;
			f = strtod(val,&end);
			param_set(param, &f);
			printf(" -> new: %4.4f\n", (double)f);

		}

		break;

	default:
		errx(1, "<unknown / unsupported type %d>\n", 0 + param_type(param));
	}

	exit(0);
}

static void
do_compare(const char* name, const char* vals[], unsigned comparisons)
{
	int32_t i;
	float f;
	param_t param = param_find(name);

	/* set nothing if parameter cannot be found */
	if (param == PARAM_INVALID) {
		/* param not found */
		errx(1, "Error: Parameter %s not found.", name);
	}

	/*
	 * Set parameter if type is known and conversion from string to value turns out fine
	 */

	int ret = 1;

	switch (param_type(param)) {
	case PARAM_TYPE_INT32:
		if (!param_get(param, &i)) {

			/* convert string */
			char* end;

			for (unsigned k = 0; k < comparisons; k++) {

				int j = strtol(vals[k],&end,10);

				if (i == j) {
					printf(" %d: ", i);
					ret = 0;
				}
			}
		}

		break;

	case PARAM_TYPE_FLOAT:
		if (!param_get(param, &f)) {

			/* convert string */
			char* end;

			for (unsigned k = 0; k < comparisons; k++) {

				float g = strtod(vals[k], &end);
				if (fabsf(f - g) < 1e-7f) {
					printf(" %4.4f: ", (double)f);
					ret = 0;	
				}
			}
		}

		break;

	default:
		errx(1, "<unknown / unsupported type %d>\n", 0 + param_type(param));
	}

	if (ret == 0) {
		printf("%c %s: match\n",
		param_value_unsaved(param) ? '*' : (param_value_is_default(param) ? ' ' : '+'),
		param_name(param));
	}

	exit(ret);
}

static void
do_reset(void)
{
	param_reset_all();

	if (param_save_default()) {
		warnx("Param export failed.");
		exit(1);
	} else {
		exit(0);
	}
}

static void
do_reset_nostart(void)
{

	int32_t autostart;
	int32_t autoconfig;

	(void)param_get(param_find("SYS_AUTOSTART"), &autostart);
	(void)param_get(param_find("SYS_AUTOCONFIG"), &autoconfig);

	param_reset_all();

	(void)param_set(param_find("SYS_AUTOSTART"), &autostart);
	(void)param_set(param_find("SYS_AUTOCONFIG"), &autoconfig);

	if (param_save_default()) {
		warnx("Param export failed.");
		exit(1);
	} else {
		exit(0);
	}
}