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

#include "common.h"
#include <string.h>
#include <stdlib.h>
#include <avr/eeprom.h>

#include "config.h"
#include "debug.h"
#include "xmalloc.h"
#include "crc.h"
#include "command.h"

#include "env.h"


#define ENV_SIZE	(CONFIG_ENV_SIZE - sizeof(uint16_t) -1)
#define ACTIVE_FLAG	1
#define OBSOLETE_FLAG	0

#define ENVLIST_DELETE	(1<<0)


/*
 * Default Environment
 */

#define DELIM 		"\0"

const FLASH char default_env[] = {
	"bootdelay="	"3"		DELIM
	"bootcmd="	"reset; loadf; go ${startaddr}"	DELIM
	"baudrate="	"115200"	DELIM
	"startaddr="	"0"		DELIM
	DELIM
};

/* EEPROM storage */
typedef struct environment_s {
	uint16_t	crc;		/* CRC16 over data bytes	*/
	uint8_t		flags;		/* active/obsolete flags	*/
	char		data[ENV_SIZE]; /* Environment data		*/
} env_t;


/* */
typedef struct env_item_s {
	char * envvar;
} env_item_t;


static uint8_t env_valid;
static env_item_t env_list[CONFIG_ENVVAR_MAX];
static int entrycount;


static
char env_get_char(uint16_t index)
{
	unsigned int off = CONFIG_ENV_OFFSET;
	char ret;

	switch (env_valid) {
	case 2:
		off += CONFIG_ENV_SIZE;
	case 1:
		ret = (char) eeprom_read_byte((const uint8_t *)off + index +
				offsetof(env_t, data));
		break;

	default:
		ret = default_env[index];
	}

	return ret;
}


static const FLASH char *comp_key;

static
int comp_env_items(const void *m1, const void *m2)
{
	env_item_t *ep1 = (env_item_t *) m1;
	env_item_t *ep2 = (env_item_t *) m2;

	if (ep1 == NULL)
		return - strcmp_P(ep2->envvar, comp_key);
	else
		return strcmp(ep1->envvar, ep2->envvar);
}


env_item_t *envlist_search(const MEMX char *name)
{
#ifdef __MEMX
	if (__builtin_avr_flash_segment(name) != -1) {
		comp_key = name;
		return bsearch(0, env_list, entrycount,
				sizeof(env_item_t), comp_env_items);
	} else {

		env_item_t e;
		e.envvar = (char *) name;

		return bsearch(&e, env_list, entrycount,
				sizeof(env_item_t), comp_env_items);
	}
#else
	env_item_t e;
	e.envvar = (char *) name;

	return bsearch(&e, env_list, entrycount,
				sizeof(env_item_t), comp_env_items);
#endif /* __MEMX */
}


static
env_item_t *envlist_enter(env_item_t *e)
{
	const size_t size = sizeof(env_item_t);
	env_item_t *ep;

	ep = bsearch(e, env_list, entrycount,
			size, comp_env_items);

	if (ep == NULL) {
		if (entrycount < CONFIG_ENVVAR_MAX) {

			env_list[entrycount++] = *e;
			qsort(env_list, entrycount, size, comp_env_items);
			ep = bsearch(e, env_list, entrycount,
						size, comp_env_items);
		}
	} else {
		free(ep->envvar);
		ep->envvar = e->envvar;
	}

	return ep;
}


static
int env_item_delete(env_item_t *ep)
{
	if (entrycount == 0)
		return -1;

	free(ep->envvar);

	entrycount--;
	size_t size = sizeof(env_item_t);
	memmove(ep, ep + 1, (env_list - ep)*size + entrycount*size);

	return 0;
}

static
int envlist_delete(const MEMX char *name)
{
	env_item_t *ep = envlist_search(name);

	if (ep != NULL)
		return env_item_delete(ep);

	return 1;
}


static
int envlist_import(uint8_t flags)
{
	uint16_t index;

	int len;
	env_item_t e;
	char *np, c;
	uint_fast8_t ef;

	if ((flags & ENVLIST_DELETE) != 0)
		while (entrycount != 0)
			env_item_delete(&env_list[entrycount-1]);

	for (index = 0; env_get_char(index) != '\0'; ) {
		for (len = 0; env_get_char(index + len) != '\0'; ++len) {
			if ((index + len) >= ENV_SIZE)
				return -1;
		}

		np = (char *) xmalloc(len+1);
		if (np == NULL) {
			printf_P(PSTR("## Can't malloc %d bytes\n"), len+1);
			return 1;
		}
		e.envvar = np;
		ef = 0;
		while ((c = env_get_char(index++)) != '\0') {
			if (!ef && (c == '=')) {
				*np = '\0';
				ef = 1;
			} else
				*np = c;
			np++;
		}
		*np = '\0';
		envlist_enter(&e);
	}


	return 0;
}


static
uint16_t env_crc(uint16_t data_offset)
{
	uint16_t crc;
	uint16_t i;
	char c, c0;

	crc = 0xffff;
	c = 0xff;
	for (i = 0; !(c == 0 && c0 == 0) && i < ENV_SIZE; i++)
	{
		c0 = c;
		c = eeprom_read_byte((const uint8_t *) data_offset + i);
		crc = crc16(crc, c);
	}
	return crc ;
}


/**
 * return valid env
 */
static
int env_check_valid(void)
{
	const uint16_t offset[2] = {CONFIG_ENV_OFFSET,
				    CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE};
	uint_fast8_t flags[2], crc_ok[2];
	int rc;

	/* read FLAGS */
	flags[0] = eeprom_read_byte ((uint8_t *) offset[0] +
				offsetof(env_t, flags));
	flags[1] = eeprom_read_byte ((uint8_t *) offset[1] +
				offsetof(env_t, flags));

	/* check CRC */
	crc_ok[0] = (
		eeprom_read_word((uint16_t *) offset[0] +
				offsetof(env_t, crc))
		== env_crc(offset[0] + offsetof(env_t, data))
	);
	crc_ok[1] = (
		eeprom_read_word((uint16_t *) offset[1] +
				offsetof(env_t, crc))
		== env_crc(offset[1] + offsetof(env_t, data))
	);

	if (!crc_ok[0] && !crc_ok[1]) {
		rc = 0;

	} else if (crc_ok[0] && !crc_ok[1]) {
		rc = 1;
	} else if (!crc_ok[0] && crc_ok[1]) {
		rc = 2;
	} else {
		/* both ok - check serial */
#if 1
		if      (flags[1] == ACTIVE_FLAG && flags[0] != ACTIVE_FLAG)
			rc = 2;
		else if (flags[1] == OBSOLETE_FLAG && flags[0] == 0xFF)
			rc = 2;
		else
			rc = 1;
#else
		if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
			rc = 1;
		else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
			rc = 2;
		else if (flags[0] == 0xFF && flags[1] == 0)
			rc = 2;
		else if (flags[1] == 0xFF && flags[0] == 0)
			rc = 1;
		else /* flags are equal - almost impossible */
			rc = 1;
#endif
	}

	return rc;
}


int env_init(void)
{
	env_valid = env_check_valid();
	if (env_valid == 0) {
		printf_P(PSTR("*** Warning - bad CRC, "
				"using default environment\n\n"));
	}

	envlist_import(ENVLIST_DELETE);
	return 0;
}


char *getenv(const MEMX char *name)
{
	env_item_t *ep;
	char *ret = NULL;

	ep = envlist_search(name);
	if (ep != NULL)
		ret = ep->envvar + strlen(ep->envvar) +1;
	return ret;
}

static
int env_item_save(env_item_t *ep, uint16_t offset, int space_left)
{
	int nlen, vlen;
	char *var = ep->envvar;

	nlen = strlen(var);
	if (nlen == 0)
		return 0;
	vlen = strlen(var + nlen + 1);
	if (vlen == 0)
		return 0;
	if (nlen + vlen + 2 > space_left)
		return 0;

	eeprom_update_block(var, (uint8_t *) offset, nlen);
	offset += nlen;
	eeprom_update_byte((uint8_t *) offset++, '=');
	eeprom_update_block(var + nlen +1, (uint8_t *) offset, vlen+1);

	return nlen + vlen + 2;
}


static
int saveenv(void)
{
	unsigned int off     = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
	unsigned int off_red = CONFIG_ENV_OFFSET;
	unsigned int pos;
	int len, left;
	uint16_t crc;
	int rc = 0;

	if (env_valid == 2) {
		off	= CONFIG_ENV_OFFSET;
		off_red	= CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
	}

	eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags), 0xff);

	pos = off + offsetof(env_t, data);
	left = ENV_SIZE - 1;
	for (int i = 0 ; i < entrycount; i++) {
		len = env_item_save(&env_list[i], pos, left);
		if (len == 0) {
			return 1;
		}
		pos += len;
		left -= len;
	}
	/* terminate list */
	eeprom_update_byte((uint8_t *) pos, 0);
	crc = env_crc(off + offsetof(env_t, data));
	eeprom_update_word((uint16_t *) off + offsetof(env_t, crc), crc);
	eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags),
					ACTIVE_FLAG);

	if (rc == 0) {
		eeprom_update_byte((uint8_t *) off_red + offsetof(env_t, flags),
					OBSOLETE_FLAG);
		env_valid = (env_valid == 2) ? 1 : 2;
	}

	return rc;
}


static
int env_item_print(env_item_t *ep)
{
	int len;
	char *ev = ep->envvar;

	len = printf_P(PSTR("%s="), ev);
	len += printf_P(PSTR("%s\n"), ev + len);

	return len;
}


/*
 * Command interface: print one or all environment variables
 *
 * Returns -1 in case of error, or length of printed string
 */
static
int env_print(const MEMX char *name)
{
	int len = -1;

	if (name) {		/* print a single name */

		env_item_t *ep = envlist_search(name);
		if (ep != NULL)
			len = env_item_print(ep);

	} else {		/* print whole list */
		len = 0;
		for (int i = 0 ; i < entrycount; i++) {
			len += env_item_print(&env_list[i]);
		}
	}
	return len;
}


/**
 * Set or delete environment variable
 *
 * Set a new environment variable,
 * or replace or delete an existing one.
 *
 * @param flag		(not used)
 * @param argc
 * @param argv[1]	Environment variable to set or delete
 *			if no more args
 * @param argv[2] ...	Value to set it to
 *
 * @return 0 if ok, 1 on error
 */
static
command_ret_t _do_env_set(int flag, int argc, char * const argv[])
{
	int i, len;
	char *name, *value, *valp, *p;
	env_item_t e, *ep;

	(void) flag;
	debug("Initial value for argc=%d\n", argc);

	name = argv[1];
	value = argv[2];

	if (strchr(name, '=')) {
		printf_P(PSTR("## Error: illegal character '='"
		       "in variable name \"%s\"\n"), name);
		return CMD_RET_FAILURE;
	}
	len = strlen(name);
	if (len > CONFIG_SYS_ENV_NAMELEN) {
		printf_P(PSTR("## Error: Variable name \"%s\" too long. "
		       "(max %d characters)\n"), name, CONFIG_SYS_ENV_NAMELEN);
		return CMD_RET_FAILURE;
	}
/*
	env_id++;
*/
	/* Delete only ? */
	if (argc < 3 || argv[2] == NULL) {
		int rc = envlist_delete(name);
		return rc ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
	}

	/*
	 * Insert / replace new value
	 */
	for (i = 2, len += 1; i < argc; ++i)
		len += strlen(argv[i]) + 1;

	value = xmalloc(len);
	if (value == NULL) {
		printf_P(PSTR("## Can't malloc %d bytes\n"), len);
		return CMD_RET_FAILURE;
	}
	strcpy(value, name);
	valp = value + strlen(name) + 1;
	for (i = 2, p = valp; i < argc; ++i) {
		char *v = argv[i];

		while ((*p++ = *v++) != '\0')
			;
		*(p - 1) = ' ';
	}
	if (p != valp)
		*--p = '\0';

	e.envvar = value;
	ep = envlist_enter(&e);
	if (!ep) {
		printf_P(PSTR("## Error inserting \"%s\" variable.\n"),
			name);
		return CMD_RET_FAILURE;
	}

	return CMD_RET_SUCCESS;
}

/**
 * Set an environment variable
 *
 * @param varname	Environment variable to set
 * @param varvalue	Value to set it to
 * @return 0 if ok, 1 on error
 */
static
int setenv(const char *varname, const char *varvalue)
{
	const char * const argv[3] = { NULL, varname, varvalue };
	int argc = 3;

	if (varvalue == NULL || varvalue[0] == '\0')
		--argc;

	return (int) _do_env_set(0, argc, (char * const *)argv);
}

/**
 * Set an environment variable to an integer value
 *
 * @param name	Environment variable to set
 * @param value	Value to set it to
 * @param radix	Base
 * @return 0 if ok, 1 on error
 */
static
int setenv_intval(const MEMX char *name, unsigned long value, int radix)
{
	char buf[11];

	ultoa(value, buf, radix);

	return setenv(name, buf);
}

/**
 * Set an environment variable to a decimal integer value
 *
 * @param name	Environment variable to set
 * @param value	Value to set it to
 * @return 0 if ok, 1 on error
 */
int setenv_ulong(const MEMX char *name, unsigned long value)
{
	return setenv_intval(name, value, 10);
}


/**
 * Set an environment variable to a value in hex
 *
 * @param name	Environment variable to set
 * @param value	Value to set it to
 * @return 0 if ok, 1 on error
 */
int setenv_hex(const MEMX char *name, unsigned long value)
{
	return setenv_intval(name, value, 16);
}


/**
 * Decode the integer value of an environment variable and return it.
 *
 * @param name		Name of environemnt variable
 * @param base		Number base to use (normally 10, or 16 for hex)
 * @param default_val	Default value to return if the variable is not
 *			found
 * @return the decoded value, or default_val if not found
 */
unsigned long getenv_ulong(const MEMX char *name, int base, unsigned long default_val)
{
	unsigned long value;
	char *vp, *endp;

	env_item_t *ep = envlist_search(name);

	if (ep != NULL ) {
		vp = ep->envvar + strlen(ep->envvar) +1;
		value = strtoul(vp, &endp, base);
		if (endp != vp)
			return value;
	}

	return default_val;
}


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

	(void) cmdtp; (void) flag;

	if (argc == 1) {
		/* print all env vars */
		int size = env_print(NULL);
		if (size < 0)
			return CMD_RET_FAILURE;
		printf_P(PSTR("\nEnvironment size: %d/%d bytes\n"),
			size, ENV_SIZE);
		return CMD_RET_SUCCESS;
	}

	/* print selected env vars */
	for (int i = 1; i < argc; ++i) {
		int rc = env_print(argv[i]);
		if (rc < 0) {
			printf_P(PSTR("## Error: \"%s\" not defined\n"), argv[i]);
			rc = CMD_RET_FAILURE;
		}
	}

	return rc;
}


command_ret_t do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	(void) cmdtp;

	if (argc < 2)
		return CMD_RET_USAGE;

	return _do_env_set(flag, argc, argv);
}


command_ret_t do_env_default(cmd_tbl_t *cmdtp, int flag,
			  int argc, char * const argv[])
{
	(void) cmdtp; (void) flag; (void) argc;	(void) argv;

	uint8_t tmp = env_valid;
	env_valid = 0;

	/* Reset the whole environment */
	printf_P(PSTR("## Resetting to default environment\n"));
	envlist_import(ENVLIST_DELETE);

	env_valid = tmp;

	return CMD_RET_SUCCESS;
}


command_ret_t do_env_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
	(void) cmdtp; (void) flag; (void) argc;	(void) argv;

	printf_P(PSTR("Saving Environment ...\n"));
	return saveenv() ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
}


#if defined(CONFIG_AUTO_COMPLETE)
int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
{
	ENTRY *match;
	int found, idx;

	idx = 0;
	found = 0;
	cmdv[0] = NULL;

	while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
		int vallen = strlen(match->key) + 1;

		if (found >= maxv - 2 || bufsz < vallen)
			break;

		cmdv[found++] = buf;
		memcpy(buf, match->key, vallen);
		buf += vallen;
		bufsz -= vallen;
	}

	qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);

	if (idx)
		cmdv[found++] = "...";

	cmdv[found] = NULL;
	return found;
}
#endif
Commit	Line	Data
d684c216 L	1	#include "common.h"
	2	#include <string.h>
	3	#include <stdlib.h>
d684c216 L	4	#include <avr/eeprom.h>
	5
	6	#include "config.h"
	7	#include "debug.h"
	8	#include "xmalloc.h"
	9	#include "crc.h"
	10	#include "command.h"
	11
	12	#include "env.h"
	13
	14
323398b1 L	15	#define ENV_SIZE (CONFIG_ENV_SIZE - sizeof(uint16_t) -1)
	16	#define ACTIVE_FLAG 1
	17	#define OBSOLETE_FLAG 0
d684c216	18
7e24905c L	19	#define ENVLIST_DELETE (1<<0)
7e24905c L	20
d684c216	21
534e1dfc L	22	/*
	23	* Default Environment
	24	*/
1da3acc4 L	25
	26	#define DELIM "\0"
	27
534e1dfc L	28	const FLASH char default_env[] = {
534e1dfc L	29	"bootdelay=" "3" DELIM
f76ca346	30	"bootcmd=" "reset; loadf; go ${startaddr}" DELIM
534e1dfc L	31	"baudrate=" "115200" DELIM
	32	"startaddr=" "0" DELIM
	33	DELIM
	34	};
	35
1da3acc4	36	/* EEPROM storage */
d684c216 L	37	typedef struct environment_s {
d684c216 L	38	uint16_t crc; /* CRC16 over data bytes */
323398b1	39	uint8_t flags; /* active/obsolete flags */
d684c216 L	40	char data[ENV_SIZE]; /* Environment data */
	41	} env_t;
	42
	43
1da3acc4	44	/* */
d684c216	45	typedef struct env_item_s {
55027f3b	46	char * envvar;
d684c216 L	47	} env_item_t;
d684c216 L	48
1da3acc4	49
323398b1	50	static uint8_t env_valid;
d684c216 L	51	static env_item_t env_list[CONFIG_ENVVAR_MAX];
	52	static int entrycount;
	53
	54
1da3acc4 L	55	static
1da3acc4 L	56	char env_get_char(uint16_t index)
d684c216 L	57	{
d684c216 L	58	unsigned int off = CONFIG_ENV_OFFSET;
55027f3b	59	char ret;
d684c216	60
55027f3b L	61	switch (env_valid) {
	62	case 2:
	63	off += CONFIG_ENV_SIZE;
	64	case 1:
	65	ret = (char) eeprom_read_byte((const uint8_t *)off + index +
d684c216	66	offsetof(env_t, data));
55027f3b	67	break;
d684c216	68
55027f3b L	69	default:
55027f3b L	70	ret = default_env[index];
d684c216	71	}
d684c216	72
55027f3b	73	return ret;
d684c216 L	74	}
d684c216 L	75
d684c216	76
04cffff0 L	77	static const FLASH char *comp_key;
04cffff0 L	78
d684c216 L	79	static
	80	int comp_env_items(const void m1, const void m2)
	81	{
d684c216 L	82	env_item_t ep1 = (env_item_t ) m1;
d684c216 L	83	env_item_t ep2 = (env_item_t ) m2;
7e24905c	84
04cffff0 L	85	if (ep1 == NULL)
	86	return - strcmp_P(ep2->envvar, comp_key);
	87	else
	88	return strcmp(ep1->envvar, ep2->envvar);
d684c216 L	89	}
d684c216 L	90
1da3acc4	91
7e24905c L	92	env_item_t envlist_search(const MEMX char name)
7e24905c L	93	{
7e24905c	94	#ifdef __MEMX
7e24905c	95	if (__builtin_avr_flash_segment(name) != -1) {
04cffff0 L	96	comp_key = name;
	97	return bsearch(0, env_list, entrycount,
	98	sizeof(env_item_t), comp_env_items);
	99	} else {
	100
	101	env_item_t e;
	102	e.envvar = (char *) name;
	103
	104	return bsearch(&e, env_list, entrycount,
	105	sizeof(env_item_t), comp_env_items);
7e24905c	106	}
04cffff0 L	107	#else
	108	env_item_t e;
	109	e.envvar = (char *) name;
7e24905c	110
55027f3b L	111	return bsearch(&e, env_list, entrycount,
55027f3b L	112	sizeof(env_item_t), comp_env_items);
04cffff0	113	#endif /* __MEMX */
7e24905c L	114	}
	115
	116
	117	static
	118	env_item_t envlist_enter(env_item_t e)
	119	{
7e24905c L	120	const size_t size = sizeof(env_item_t);
	121	env_item_t *ep;
	122
55027f3b L	123	ep = bsearch(e, env_list, entrycount,
55027f3b L	124	size, comp_env_items);
7e24905c L	125
	126	if (ep == NULL) {
	127	if (entrycount < CONFIG_ENVVAR_MAX) {
	128
	129	env_list[entrycount++] = *e;
	130	qsort(env_list, entrycount, size, comp_env_items);
55027f3b L	131	ep = bsearch(e, env_list, entrycount,
55027f3b L	132	size, comp_env_items);
7e24905c L	133	}
7e24905c L	134	} else {
55027f3b L	135	free(ep->envvar);
55027f3b L	136	ep->envvar = e->envvar;
7e24905c L	137	}
	138
	139	return ep;
	140	}
	141
	142
	143	static
	144	int env_item_delete(env_item_t *ep)
	145	{
	146	if (entrycount == 0)
	147	return -1;
55027f3b L	148
55027f3b L	149	free(ep->envvar);
7e24905c L	150
	151	entrycount--;
	152	size_t size = sizeof(env_item_t);
	153	memmove(ep, ep + 1, (env_list - ep)size + entrycountsize);
	154
	155	return 0;
	156	}
	157
	158	static
04cffff0	159	int envlist_delete(const MEMX char *name)
7e24905c	160	{
04cffff0	161	env_item_t *ep = envlist_search(name);
7e24905c L	162
	163	if (ep != NULL)
	164	return env_item_delete(ep);
	165
	166	return 1;
	167	}
	168
	169
7e24905c L	170
	171	static
	172	int envlist_import(uint8_t flags)
d684c216	173	{
55027f3b L	174	uint16_t index;
	175
	176	int len;
1da3acc4	177	env_item_t e;
55027f3b L	178	char *np, c;
55027f3b L	179	uint_fast8_t ef;
7e24905c L	180
	181	if ((flags & ENVLIST_DELETE) != 0)
	182	while (entrycount != 0)
	183	env_item_delete(&env_list[entrycount-1]);
	184
55027f3b L	185	for (index = 0; env_get_char(index) != '\0'; ) {
	186	for (len = 0; env_get_char(index + len) != '\0'; ++len) {
	187	if ((index + len) >= ENV_SIZE)
	188	return -1;
1da3acc4	189	}
d684c216	190
55027f3b L	191	np = (char *) xmalloc(len+1);
	192	if (np == NULL) {
	193	printf_P(PSTR("## Can't malloc %d bytes\n"), len+1);
	194	return 1;
d684c216	195	}
55027f3b L	196	e.envvar = np;
	197	ef = 0;
	198	while ((c = env_get_char(index++)) != '\0') {
	199	if (!ef && (c == '=')) {
	200	*np = '\0';
	201	ef = 1;
	202	} else
	203	*np = c;
	204	np++;
	205	}
	206	*np = '\0';
	207	envlist_enter(&e);
d684c216	208	}
d684c216	209
55027f3b	210
1da3acc4 L	211	return 0;
1da3acc4 L	212	}
d684c216 L	213
d684c216 L	214
1da3acc4 L	215	static
1da3acc4 L	216	uint16_t env_crc(uint16_t data_offset)
323398b1	217	{
7e24905c	218	uint16_t crc;
1da3acc4 L	219	uint16_t i;
1da3acc4 L	220	char c, c0;
323398b1	221
1da3acc4 L	222	crc = 0xffff;
	223	c = 0xff;
	224	for (i = 0; !(c == 0 && c0 == 0) && i < ENV_SIZE; i++)
	225	{
7e24905c	226	c0 = c;
1da3acc4 L	227	c = eeprom_read_byte((const uint8_t *) data_offset + i);
1da3acc4 L	228	crc = crc16(crc, c);
323398b1	229	}
1da3acc4 L	230	return crc ;
1da3acc4 L	231	}
323398b1 L	232
323398b1 L	233
1da3acc4 L	234	/**
1da3acc4 L	235	* return valid env
323398b1	236	*/
1da3acc4 L	237	static
	238	int env_check_valid(void)
	239	{
	240	const uint16_t offset[2] = {CONFIG_ENV_OFFSET,
	241	CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE};
	242	uint_fast8_t flags[2], crc_ok[2];
	243	int rc;
	244
	245	/* read FLAGS */
	246	flags[0] = eeprom_read_byte ((uint8_t *) offset[0] +
	247	offsetof(env_t, flags));
	248	flags[1] = eeprom_read_byte ((uint8_t *) offset[1] +
	249	offsetof(env_t, flags));
	250
	251	/* check CRC */
	252	crc_ok[0] = (
	253	eeprom_read_word((uint16_t *) offset[0] +
	254	offsetof(env_t, crc))
	255	== env_crc(offset[0] + offsetof(env_t, data))
	256	);
	257	crc_ok[1] = (
	258	eeprom_read_word((uint16_t *) offset[1] +
	259	offsetof(env_t, crc))
	260	== env_crc(offset[1] + offsetof(env_t, data))
	261	);
323398b1	262
1da3acc4 L	263	if (!crc_ok[0] && !crc_ok[1]) {
1da3acc4 L	264	rc = 0;
323398b1	265
1da3acc4 L	266	} else if (crc_ok[0] && !crc_ok[1]) {
	267	rc = 1;
	268	} else if (!crc_ok[0] && crc_ok[1]) {
	269	rc = 2;
	270	} else {
	271	/* both ok - check serial */
	272	#if 1
	273	if (flags[1] == ACTIVE_FLAG && flags[0] != ACTIVE_FLAG)
	274	rc = 2;
	275	else if (flags[1] == OBSOLETE_FLAG && flags[0] == 0xFF)
	276	rc = 2;
	277	else
	278	rc = 1;
	279	#else
	280	if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
	281	rc = 1;
	282	else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
	283	rc = 2;
	284	else if (flags[0] == 0xFF && flags[1] == 0)
	285	rc = 2;
	286	else if (flags[1] == 0xFF && flags[0] == 0)
	287	rc = 1;
	288	else /* flags are equal - almost impossible */
	289	rc = 1;
	290	#endif
323398b1	291	}
7e24905c	292
1da3acc4 L	293	return rc;
1da3acc4 L	294	}
323398b1 L	295
323398b1 L	296
1da3acc4	297	int env_init(void)
323398b1	298	{
1da3acc4 L	299	env_valid = env_check_valid();
1da3acc4 L	300	if (env_valid == 0) {
55027f3b	301	printf_P(PSTR("*** Warning - bad CRC, "
1da3acc4	302	"using default environment\n\n"));
d684c216	303	}
55027f3b	304
7e24905c L	305	envlist_import(ENVLIST_DELETE);
7e24905c L	306	return 0;
323398b1	307	}
d684c216	308
1da3acc4	309
fc30b18e	310	char getenv(const MEMX char name)
d684c216 L	311	{
	312	env_item_t *ep;
	313	char *ret = NULL;
	314
55027f3b	315	ep = envlist_search(name);
d684c216	316	if (ep != NULL)
55027f3b	317	ret = ep->envvar + strlen(ep->envvar) +1;
d684c216 L	318	return ret;
	319	}
	320
1da3acc4 L	321	static
1da3acc4 L	322	int env_item_save(env_item_t *ep, uint16_t offset, int space_left)
323398b1	323	{
55027f3b L	324	int nlen, vlen;
55027f3b L	325	char *var = ep->envvar;
323398b1	326
55027f3b L	327	nlen = strlen(var);
55027f3b L	328	if (nlen == 0)
1da3acc4	329	return 0;
55027f3b L	330	vlen = strlen(var + nlen + 1);
	331	if (vlen == 0)
	332	return 0;
	333	if (nlen + vlen + 2 > space_left)
1da3acc4	334	return 0;
7e24905c	335
55027f3b L	336	eeprom_update_block(var, (uint8_t *) offset, nlen);
	337	offset += nlen;
	338	eeprom_update_byte((uint8_t *) offset++, '=');
	339	eeprom_update_block(var + nlen +1, (uint8_t *) offset, vlen+1);
	340
	341	return nlen + vlen + 2;
7e24905c	342	}
1da3acc4	343
323398b1	344
1da3acc4	345	static
d684c216 L	346	int saveenv(void)
d684c216 L	347	{
323398b1 L	348	unsigned int off = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
	349	unsigned int off_red = CONFIG_ENV_OFFSET;
	350	unsigned int pos;
	351	int len, left;
	352	uint16_t crc;
	353	int rc = 0;
d684c216	354
323398b1 L	355	if (env_valid == 2) {
	356	off = CONFIG_ENV_OFFSET;
	357	off_red = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
	358	}
	359
7e24905c	360	eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags), 0xff);
d684c216	361
323398b1 L	362	pos = off + offsetof(env_t, data);
	363	left = ENV_SIZE - 1;
	364	for (int i = 0 ; i < entrycount; i++) {
	365	len = env_item_save(&env_list[i], pos, left);
	366	if (len == 0) {
	367	return 1;
	368	}
	369	pos += len;
	370	left -= len;
	371	}
	372	/* terminate list */
	373	eeprom_update_byte((uint8_t *) pos, 0);
	374	crc = env_crc(off + offsetof(env_t, data));
	375	eeprom_update_word((uint16_t *) off + offsetof(env_t, crc), crc);
7e24905c	376	eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags),
323398b1 L	377	ACTIVE_FLAG);
	378
	379	if (rc == 0) {
7e24905c	380	eeprom_update_byte((uint8_t *) off_red + offsetof(env_t, flags),
323398b1 L	381	OBSOLETE_FLAG);
323398b1 L	382	env_valid = (env_valid == 2) ? 1 : 2;
323398b1	383	}
7e24905c	384
d684c216 L	385	return rc;
	386	}
	387
d684c216	388
1da3acc4 L	389	static
1da3acc4 L	390	int env_item_print(env_item_t *ep)
d684c216	391	{
1da3acc4	392	int len;
55027f3b L	393	char *ev = ep->envvar;
	394
	395	len = printf_P(PSTR("%s="), ev);
	396	len += printf_P(PSTR("%s\n"), ev + len);
1da3acc4 L	397
1da3acc4 L	398	return len;
7e24905c	399	}
323398b1 L	400
323398b1 L	401
d684c216 L	402	/*
	403	* Command interface: print one or all environment variables
	404	*
	405	* Returns -1 in case of error, or length of printed string
	406	*/
7e24905c	407	static
fc30b18e	408	int env_print(const MEMX char *name)
d684c216 L	409	{
	410	int len = -1;
	411
	412	if (name) { /* print a single name */
7e24905c	413
d684c216 L	414	env_item_t *ep = envlist_search(name);
	415	if (ep != NULL)
	416	len = env_item_print(ep);
	417
	418	} else { /* print whole list */
	419	len = 0;
	420	for (int i = 0 ; i < entrycount; i++) {
	421	len += env_item_print(&env_list[i]);
	422	}
	423	}
	424	return len;
	425	}
	426
1da3acc4	427
72f58822 L	428	/**
	429	* Set or delete environment variable
	430	*
d684c216 L	431	* Set a new environment variable,
d684c216 L	432	* or replace or delete an existing one.
72f58822 L	433	*
	434	* @param flag (not used)
	435	* @param argc
	436	* @param argv[1] Environment variable to set or delete
	437	* if no more args
	438	* @param argv[2] ... Value to set it to
	439	*
	440	* @return 0 if ok, 1 on error
d684c216	441	*/
1da3acc4	442	static
d0581f88	443	command_ret_t _do_env_set(int flag, int argc, char * const argv[])
d684c216	444	{
72f58822	445	int i, len;
55027f3b	446	char name, value, valp, p;
d684c216 L	447	env_item_t e, *ep;
	448
	449	(void) flag;
	450	debug("Initial value for argc=%d\n", argc);
	451
	452	name = argv[1];
	453	value = argv[2];
	454
	455	if (strchr(name, '=')) {
	456	printf_P(PSTR("## Error: illegal character '='"
	457	"in variable name \"%s\"\n"), name);
d0581f88	458	return CMD_RET_FAILURE;
d684c216	459	}
55027f3b L	460	len = strlen(name);
55027f3b L	461	if (len > CONFIG_SYS_ENV_NAMELEN) {
d684c216 L	462	printf_P(PSTR("## Error: Variable name \"%s\" too long. "
d684c216 L	463	"(max %d characters)\n"), name, CONFIG_SYS_ENV_NAMELEN);
d0581f88	464	return CMD_RET_FAILURE;
d684c216 L	465	}
	466	/*
	467	env_id++;
	468	*/
	469	/* Delete only ? */
	470	if (argc < 3 \|\| argv[2] == NULL) {
	471	int rc = envlist_delete(name);
d0581f88	472	return rc ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
d684c216 L	473	}
	474
	475	/*
	476	* Insert / replace new value
	477	*/
55027f3b	478	for (i = 2, len += 1; i < argc; ++i)
d684c216 L	479	len += strlen(argv[i]) + 1;
	480
	481	value = xmalloc(len);
	482	if (value == NULL) {
	483	printf_P(PSTR("## Can't malloc %d bytes\n"), len);
d0581f88	484	return CMD_RET_FAILURE;
d684c216	485	}
55027f3b L	486	strcpy(value, name);
	487	valp = value + strlen(name) + 1;
	488	for (i = 2, p = valp; i < argc; ++i) {
d684c216 L	489	char *v = argv[i];
d684c216 L	490
55027f3b	491	while ((p++ = v++) != '\0')
d684c216	492	;
55027f3b	493	*(p - 1) = ' ';
d684c216	494	}
55027f3b L	495	if (p != valp)
55027f3b L	496	*--p = '\0';
d684c216	497
55027f3b	498	e.envvar = value;
d684c216 L	499	ep = envlist_enter(&e);
	500	if (!ep) {
	501	printf_P(PSTR("## Error inserting \"%s\" variable.\n"),
	502	name);
d0581f88	503	return CMD_RET_FAILURE;
d684c216 L	504	}
d684c216 L	505
d0581f88	506	return CMD_RET_SUCCESS;
d684c216 L	507	}
d684c216 L	508
72f58822 L	509	/**
	510	* Set an environment variable
	511	*
	512	* @param varname Environment variable to set
	513	* @param varvalue Value to set it to
	514	* @return 0 if ok, 1 on error
	515	*/
1da3acc4	516	static
d684c216 L	517	int setenv(const char varname, const char varvalue)
	518	{
	519	const char * const argv[3] = { NULL, varname, varvalue };
	520	int argc = 3;
	521
	522	if (varvalue == NULL \|\| varvalue[0] == '\0')
	523	--argc;
7e24905c	524
d0581f88	525	return (int) _do_env_set(0, argc, (char * const *)argv);
d684c216 L	526	}
d684c216 L	527
d684c216 L	528	/**
	529	* Set an environment variable to an integer value
	530	*
f76ca346 L	531	* @param name Environment variable to set
	532	* @param value Value to set it to
	533	* @param radix Base
d684c216 L	534	* @return 0 if ok, 1 on error
d684c216 L	535	*/
f76ca346 L	536	static
f76ca346 L	537	int setenv_intval(const MEMX char *name, unsigned long value, int radix)
d684c216	538	{
f76ca346	539	char buf[11];
d684c216	540
f76ca346	541	ultoa(value, buf, radix);
d684c216	542
f76ca346 L	543	return setenv(name, buf);
f76ca346 L	544	}
d684c216 L	545
d684c216 L	546	/**
f76ca346	547	* Set an environment variable to a decimal integer value
d684c216	548	*
f76ca346 L	549	* @param name Environment variable to set
f76ca346 L	550	* @param value Value to set it to
d684c216 L	551	* @return 0 if ok, 1 on error
d684c216 L	552	*/
f76ca346	553	int setenv_ulong(const MEMX char *name, unsigned long value)
d684c216	554	{
f76ca346 L	555	return setenv_intval(name, value, 10);
	556	}
	557
d684c216	558
f76ca346 L	559	/**
	560	* Set an environment variable to a value in hex
	561	*
	562	* @param name Environment variable to set
	563	* @param value Value to set it to
	564	* @return 0 if ok, 1 on error
	565	*/
	566	int setenv_hex(const MEMX char *name, unsigned long value)
	567	{
	568	return setenv_intval(name, value, 16);
d684c216 L	569	}
d684c216 L	570
35e9ec0c	571
72f58822	572	/**
35e9ec0c	573	* Decode the integer value of an environment variable and return it.
72f58822	574	*
35e9ec0c L	575	* @param name Name of environemnt variable
	576	* @param base Number base to use (normally 10, or 16 for hex)
	577	* @param default_val Default value to return if the variable is not
	578	* found
	579	* @return the decoded value, or default_val if not found
72f58822	580	*/
fc30b18e	581	unsigned long getenv_ulong(const MEMX char *name, int base, unsigned long default_val)
d684c216	582	{
d684c216	583	unsigned long value;
35e9ec0c L	584	char vp, endp;
	585
	586	env_item_t *ep = envlist_search(name);
d684c216	587
35e9ec0c	588	if (ep != NULL ) {
55027f3b L	589	vp = ep->envvar + strlen(ep->envvar) +1;
	590	value = strtoul(vp, &endp, base);
	591	if (endp != vp)
	592	return value;
35e9ec0c	593	}
d684c216	594
35e9ec0c	595	return default_val;
d684c216 L	596	}
d684c216 L	597
35e9ec0c	598
f76ca346 L	599	command_ret_t do_env_print(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	600	{
	601	command_ret_t rc = CMD_RET_SUCCESS;
	602
	603	(void) cmdtp; (void) flag;
	604
	605	if (argc == 1) {
	606	/* print all env vars */
	607	int size = env_print(NULL);
	608	if (size < 0)
	609	return CMD_RET_FAILURE;
	610	printf_P(PSTR("\nEnvironment size: %d/%d bytes\n"),
	611	size, ENV_SIZE);
	612	return CMD_RET_SUCCESS;
	613	}
	614
	615	/* print selected env vars */
	616	for (int i = 1; i < argc; ++i) {
	617	int rc = env_print(argv[i]);
	618	if (rc < 0) {
	619	printf_P(PSTR("## Error: \"%s\" not defined\n"), argv[i]);
	620	rc = CMD_RET_FAILURE;
	621	}
	622	}
	623
	624	return rc;
	625	}
	626
	627
d0581f88	628	command_ret_t do_env_set(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
d684c216 L	629	{
	630	(void) cmdtp;
	631
	632	if (argc < 2)
	633	return CMD_RET_USAGE;
	634
	635	return _do_env_set(flag, argc, argv);
	636	}
	637
	638
7e24905c L	639	command_ret_t do_env_default(cmd_tbl_t *cmdtp, int flag,
	640	int argc, char * const argv[])
	641	{
	642	(void) cmdtp; (void) flag; (void) argc; (void) argv;
	643
55027f3b L	644	uint8_t tmp = env_valid;
	645	env_valid = 0;
	646
7e24905c	647	/* Reset the whole environment */
55027f3b	648	printf_P(PSTR("## Resetting to default environment\n"));
7e24905c L	649	envlist_import(ENVLIST_DELETE);
7e24905c L	650
55027f3b L	651	env_valid = tmp;
55027f3b L	652
7e24905c L	653	return CMD_RET_SUCCESS;
	654	}
	655
55027f3b	656
d0581f88	657	command_ret_t do_env_save(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
323398b1 L	658	{
	659	(void) cmdtp; (void) flag; (void) argc; (void) argv;
	660
	661	printf_P(PSTR("Saving Environment ...\n"));
d0581f88	662	return saveenv() ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
323398b1 L	663	}
323398b1 L	664
55027f3b	665
7e24905c	666	#if defined(CONFIG_AUTO_COMPLETE)
d684c216 L	667	int env_complete(char var, int maxv, char cmdv[], int bufsz, char *buf)
	668	{
	669	ENTRY *match;
	670	int found, idx;
	671
	672	idx = 0;
	673	found = 0;
	674	cmdv[0] = NULL;
	675
	676	while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
	677	int vallen = strlen(match->key) + 1;
	678
	679	if (found >= maxv - 2 \|\| bufsz < vallen)
	680	break;
	681
	682	cmdv[found++] = buf;
	683	memcpy(buf, match->key, vallen);
	684	buf += vallen;
	685	bufsz -= vallen;
	686	}
	687
	688	qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
	689
	690	if (idx)
	691	cmdv[found++] = "...";
	692
	693	cmdv[found] = NULL;
	694	return found;
	695	}
	696	#endif