[u-boot.git] / cmd / setexpr.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2008 Freescale Semiconductor, Inc.
 * Copyright 2013 Wolfgang Denk <[email protected]>
 */

/*
 * This file provides a shell like 'expr' function to return.
 */

#include <common.h>
#include <config.h>
#include <command.h>
#include <env.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <linux/sizes.h>

/**
 * struct expr_arg: Holds an argument to an expression
 *
 * @ival: Integer value (if width is not CMD_DATA_SIZE_STR)
 * @sval: String value (if width is CMD_DATA_SIZE_STR)
 */
struct expr_arg {
	union {
		ulong ival;
		char *sval;
	};
};

static int get_arg(char *s, int w, struct expr_arg *argp)
{
	struct expr_arg arg;

	/*
	 * If the parameter starts with a '*' then assume it is a pointer to
	 * the value we want.
	 */
	if (s[0] == '*') {
		ulong *p;
		ulong addr;
		ulong val;
		int len;
		char *str;

		addr = simple_strtoul(&s[1], NULL, 16);
		switch (w) {
		case 1:
			p = map_sysmem(addr, sizeof(uchar));
			val = (ulong)*(uchar *)p;
			unmap_sysmem(p);
			arg.ival = val;
			break;
		case 2:
			p = map_sysmem(addr, sizeof(ushort));
			val = (ulong)*(ushort *)p;
			unmap_sysmem(p);
			arg.ival = val;
			break;
		case CMD_DATA_SIZE_STR:
			p = map_sysmem(addr, SZ_64K);

			/* Maximum string length of 64KB plus terminator */
			len = strnlen((char *)p, SZ_64K) + 1;
			str = malloc(len);
			if (!str) {
				printf("Out of memory\n");
				return -ENOMEM;
			}
			memcpy(str, p, len);
			str[len - 1] = '\0';
			unmap_sysmem(p);
			arg.sval = str;
			break;
		case 4:
			p = map_sysmem(addr, sizeof(u32));
			val = *(u32 *)p;
			unmap_sysmem(p);
			arg.ival = val;
			break;
		default:
			p = map_sysmem(addr, sizeof(ulong));
			val = *p;
			unmap_sysmem(p);
			arg.ival = val;
			break;
		}
	} else {
		if (w == CMD_DATA_SIZE_STR)
			return -EINVAL;
		arg.ival = simple_strtoul(s, NULL, 16);
	}
	*argp = arg;

	return 0;
}

#ifdef CONFIG_REGEX

#include <slre.h>

/*
 * memstr - Find the first substring in memory
 * @s1: The string to be searched
 * @s2: The string to search for
 *
 * Similar to and based on strstr(),
 * but strings do not need to be NUL terminated.
 */
static char *memstr(const char *s1, int l1, const char *s2, int l2)
{
	if (!l2)
		return (char *)s1;

	while (l1 >= l2) {
		l1--;
		if (!memcmp(s1, s2, l2))
			return (char *)s1;
		s1++;
	}
	return NULL;
}

/**
 * substitute() - Substitute part of one string with another
 *
 * This updates @string so that the first occurrence of @old is replaced with
 * @new
 *
 * @string: String buffer containing string to update at the start
 * @slen: Pointer to current string length, updated on success
 * @ssize: Size of string buffer
 * @old: Old string to find in the buffer (no terminator needed)
 * @olen: Length of @old excluding terminator
 * @new: New string to replace @old with
 * @nlen: Length of @new excluding terminator
 * @return pointer to immediately after the copied @new in @string, or NULL if
 *	no replacement took place
 */
static char *substitute(char *string, int *slen, int ssize,
			const char *old, int olen, const char *new, int nlen)
{
	char *p = memstr(string, *slen, old, olen);

	if (p == NULL)
		return NULL;

	debug("## Match at pos %ld: match len %d, subst len %d\n",
		(long)(p - string), olen, nlen);

	/* make sure replacement matches */
	if (*slen + nlen - olen > ssize) {
		printf("## error: substitution buffer overflow\n");
		return NULL;
	}

	/* move tail if needed */
	if (olen != nlen) {
		int tail, len;

		len = (olen > nlen) ? olen : nlen;

		tail = ssize - (p + len - string);

		debug("## tail len %d\n", tail);

		memmove(p + nlen, p + olen, tail);
	}

	/* insert substitute */
	memcpy(p, new, nlen);

	*slen += nlen - olen;

	return p + nlen;
}

int setexpr_regex_sub(char *data, uint data_size, char *nbuf, uint nbuf_size,
		      const char *r, const char *s, bool global)
{
	struct slre slre;
	char *datap = data;
	int res, len, nlen, loop;

	if (slre_compile(&slre, r) == 0) {
		printf("Error compiling regex: %s\n", slre.err_str);
		return 1;
	}

	len = strlen(data);
	for (loop = 0;; loop++) {
		struct cap caps[slre.num_caps + 2];
		const char *old;
		char *np;
		int i, olen;

		(void) memset(caps, 0, sizeof(caps));

		res = slre_match(&slre, datap, len - (datap - data), caps);

		debug("Result: %d\n", res);

		for (i = 0; i <= slre.num_caps; i++) {
			if (caps[i].len > 0) {
				debug("Substring %d: [%.*s]\n", i,
					caps[i].len, caps[i].ptr);
			}
		}

		if (res == 0) {
			if (loop == 0) {
				printf("%s: No match\n", data);
				return 1;
			} else {
				break;
			}
		}

		debug("## MATCH ## %s\n", data);

		if (!s)
			return 1;

		old = caps[0].ptr;
		olen = caps[0].len;
		nlen = strlen(s);

		if (nlen + 1 >= nbuf_size) {
			printf("## error: pattern buffer overflow: have %d, need %d\n",
			       nbuf_size, nlen + 1);
			return 1;
		}
		strcpy(nbuf, s);

		debug("## SUBST(1) ## %s\n", nbuf);

		/*
		 * Handle back references
		 *
		 * Support for \0 ... \9, where \0 is the
		 * whole matched pattern (similar to &).
		 *
		 * Implementation is a bit simpleminded as
		 * backrefs are substituted sequentially, one
		 * by one.  This will lead to somewhat
		 * unexpected results if the replacement
		 * strings contain any \N strings then then
		 * may get substitued, too.  We accept this
		 * restriction for the sake of simplicity.
		 */
		for (i = 0; i < 10; ++i) {
			char backref[2] = {
				'\\',
				'0',
			};

			if (caps[i].len == 0)
				break;

			backref[1] += i;

			debug("## BACKREF %d: replace \"%.*s\" by \"%.*s\" in \"%s\"\n",
				i,
				2, backref,
				caps[i].len, caps[i].ptr,
				nbuf);

			for (np = nbuf;;) {
				char *p = memstr(np, nlen, backref, 2);

				if (p == NULL)
					break;

				np = substitute(np, &nlen,
					nbuf_size - (np - nbuf),
					backref, 2,
					caps[i].ptr, caps[i].len);

				if (np == NULL)
					return 1;
			}
		}
		debug("## SUBST(2) ## %s\n", nbuf);

		datap = substitute(datap, &len, data_size - (datap - data),
				   old, olen, nbuf, nlen);

		if (datap == NULL)
			return 1;

		debug("## REMAINDER: %s\n", datap);

		debug("## RESULT: %s\n", data);

		if (!global)
			break;
	}
	debug("## FINAL (now env_set()) :  %s\n", data);

	return 0;
}

#define SLRE_BUFSZ	16384
#define SLRE_PATSZ	4096

/*
 * Perform regex operations on a environment variable
 *
 * Returns 0 if OK, 1 in case of errors.
 */
static int regex_sub_var(const char *name, const char *r, const char *s,
			 const char *t, int global)
{
	struct slre slre;
	char data[SLRE_BUFSZ];
	char nbuf[SLRE_PATSZ];
	const char *value;
	int len;
	int ret;

	if (!name)
		return 1;

	if (slre_compile(&slre, r) == 0) {
		printf("Error compiling regex: %s\n", slre.err_str);
		return 1;
	}

	if (!t) {
		value = env_get(name);
		if (!value) {
			printf("## Error: variable \"%s\" not defined\n", name);
			return 1;
		}
		t = value;
	}

	debug("REGEX on %s=%s\n", name, t);
	debug("REGEX=\"%s\", SUBST=\"%s\", GLOBAL=%d\n", r, s ? s : "<NULL>",
	      global);

	len = strlen(t);
	if (len + 1 > SLRE_BUFSZ) {
		printf("## error: subst buffer overflow: have %d, need %d\n",
		       SLRE_BUFSZ, len + 1);
		return 1;
	}

	strcpy(data, t);

	ret = setexpr_regex_sub(data, SLRE_BUFSZ, nbuf, SLRE_PATSZ, r, s,
				global);
	if (ret)
		return 1;

	printf("%s=%s\n", name, data);

	return env_set(name, data);
}
#endif

static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
		      char *const argv[])
{
	struct expr_arg aval, bval;
	ulong value;
	int ret = 0;
	int w;

	/*
	 * We take 3, 5, or 6 arguments:
	 * 3 : setexpr name value
	 * 5 : setexpr name val1 op val2
	 *     setexpr name [g]sub r s
	 * 6 : setexpr name [g]sub r s t
	 */

	/* > 6 already tested by max command args */
	if ((argc < 3) || (argc == 4))
		return CMD_RET_USAGE;

	w = cmd_get_data_size(argv[0], 4);

	if (get_arg(argv[2], w, &aval))
		return CMD_RET_FAILURE;

	/* plain assignment: "setexpr name value" */
	if (argc == 3) {
		if (w == CMD_DATA_SIZE_STR) {
			ret = env_set(argv[1], aval.sval);
			free(aval.sval);
		} else {
			ret = env_set_hex(argv[1], aval.ival);
		}

		return ret;
	}

	/* 5 or 6 args (6 args only with [g]sub) */
#ifdef CONFIG_REGEX
	/*
	 * rexep handling: "setexpr name [g]sub r s [t]"
	 * with 5 args, "t" will be NULL
	 */
	if (strcmp(argv[2], "gsub") == 0)
		return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 1);

	if (strcmp(argv[2], "sub") == 0)
		return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 0);
#endif

	/* standard operators: "setexpr name val1 op val2" */
	if (argc != 5)
		return CMD_RET_USAGE;

	if (strlen(argv[3]) != 1)
		return CMD_RET_USAGE;

	if (get_arg(argv[4], w, &bval)) {
		if (w == CMD_DATA_SIZE_STR)
			free(aval.sval);
		return CMD_RET_FAILURE;
	}

	if (w == CMD_DATA_SIZE_STR) {
		int len;
		char *str;

		switch (argv[3][0]) {
		case '+':
			len = strlen(aval.sval) + strlen(bval.sval) + 1;
			str = malloc(len);
			if (!str) {
				printf("Out of memory\n");
				ret = CMD_RET_FAILURE;
			} else {
				/* These were copied out and checked earlier */
				strcpy(str, aval.sval);
				strcat(str, bval.sval);
				ret = env_set(argv[1], str);
				if (ret)
					printf("Could not set var\n");
				free(str);
			}
			break;
		default:
			printf("invalid op\n");
			ret = 1;
		}
	} else {
		ulong a = aval.ival;
		ulong b = bval.ival;

		switch (argv[3][0]) {
		case '|':
			value = a | b;
			break;
		case '&':
			value = a & b;
			break;
		case '+':
			value = a + b;
			break;
		case '^':
			value = a ^ b;
			break;
		case '-':
			value = a - b;
			break;
		case '*':
			value = a * b;
			break;
		case '/':
			value = a / b;
			break;
		case '%':
			value = a % b;
			break;
		default:
			printf("invalid op\n");
			return 1;
		}

		env_set_hex(argv[1], value);
	}

	if (w == CMD_DATA_SIZE_STR) {
		free(aval.sval);
		free(bval.sval);
	}

	return ret;
}

U_BOOT_CMD(
	setexpr, 6, 0, do_setexpr,
	"set environment variable as the result of eval expression",
	"[.b, .w, .l, .s] name [*]value1 <op> [*]value2\n"
	"    - set environment variable 'name' to the result of the evaluated\n"
	"      expression specified by <op>.  <op> can be &, |, ^, +, -, *, /, %\n"
	"      (for strings only + is supported)\n"
	"      size argument is only meaningful if value1 and/or value2 are\n"
	"      memory addresses (*)\n"
	"setexpr[.b, .w, .l] name [*]value\n"
	"    - load a value into a variable"
#ifdef CONFIG_REGEX
	"\n"
	"setexpr name gsub r s [t]\n"
	"    - For each substring matching the regular expression <r> in the\n"
	"      string <t>, substitute the string <s>.  The result is\n"
	"      assigned to <name>.  If <t> is not supplied, use the old\n"
	"      value of <name>\n"
	"setexpr name sub r s [t]\n"
	"    - Just like gsub(), but replace only the first matching substring"
#endif
);
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
d058698f KG	2	/*
d058698f KG	3	* Copyright 2008 Freescale Semiconductor, Inc.
855f18ea	4	* Copyright 2013 Wolfgang Denk <[email protected]>
d058698f KG	5	*/
	6
	7	/*
	8	* This file provides a shell like 'expr' function to return.
	9	*/
	10
	11	#include <common.h>
	12	#include <config.h>
	13	#include <command.h>
c7694dd4	14	#include <env.h>
f7ae49fc	15	#include <log.h>
2c02152a	16	#include <malloc.h>
2068cea1	17	#include <mapmem.h>
2c02152a	18	#include <linux/sizes.h>
d058698f	19
f66bee41 SG	20	/**
	21	* struct expr_arg: Holds an argument to an expression
	22	*
	23	* @ival: Integer value (if width is not CMD_DATA_SIZE_STR)
2c02152a	24	* @sval: String value (if width is CMD_DATA_SIZE_STR)
f66bee41 SG	25	*/
f66bee41 SG	26	struct expr_arg {
2c02152a SG	27	union {
	28	ulong ival;
	29	char *sval;
	30	};
f66bee41 SG	31	};
	32
	33	static int get_arg(char s, int w, struct expr_arg argp)
47ab5ad1	34	{
f66bee41 SG	35	struct expr_arg arg;
f66bee41 SG	36
482126e2	37	/*
2068cea1 JH	38	* If the parameter starts with a '*' then assume it is a pointer to
2068cea1 JH	39	* the value we want.
47ab5ad1	40	*/
47ab5ad1	41	if (s[0] == '*') {
2068cea1 JH	42	ulong *p;
	43	ulong addr;
	44	ulong val;
2c02152a SG	45	int len;
2c02152a SG	46	char *str;
2068cea1 JH	47
2068cea1 JH	48	addr = simple_strtoul(&s[1], NULL, 16);
47ab5ad1	49	switch (w) {
2068cea1 JH	50	case 1:
	51	p = map_sysmem(addr, sizeof(uchar));
	52	val = (ulong)(uchar )p;
	53	unmap_sysmem(p);
f66bee41 SG	54	arg.ival = val;
f66bee41 SG	55	break;
2068cea1 JH	56	case 2:
	57	p = map_sysmem(addr, sizeof(ushort));
	58	val = (ulong)(ushort )p;
	59	unmap_sysmem(p);
f66bee41 SG	60	arg.ival = val;
f66bee41 SG	61	break;
2c02152a SG	62	case CMD_DATA_SIZE_STR:
	63	p = map_sysmem(addr, SZ_64K);
	64
	65	/* Maximum string length of 64KB plus terminator */
	66	len = strnlen((char *)p, SZ_64K) + 1;
	67	str = malloc(len);
	68	if (!str) {
	69	printf("Out of memory\n");
	70	return -ENOMEM;
	71	}
	72	memcpy(str, p, len);
	73	str[len - 1] = '\0';
	74	unmap_sysmem(p);
	75	arg.sval = str;
	76	break;
47ab5ad1	77	case 4:
25a43ac8 SG	78	p = map_sysmem(addr, sizeof(u32));
	79	val = (u32 )p;
	80	unmap_sysmem(p);
f66bee41 SG	81	arg.ival = val;
f66bee41 SG	82	break;
2068cea1 JH	83	default:
	84	p = map_sysmem(addr, sizeof(ulong));
	85	val = *p;
	86	unmap_sysmem(p);
f66bee41 SG	87	arg.ival = val;
f66bee41 SG	88	break;
47ab5ad1 FM	89	}
47ab5ad1 FM	90	} else {
2c02152a SG	91	if (w == CMD_DATA_SIZE_STR)
2c02152a SG	92	return -EINVAL;
f66bee41	93	arg.ival = simple_strtoul(s, NULL, 16);
47ab5ad1	94	}
f66bee41 SG	95	*argp = arg;
	96
	97	return 0;
47ab5ad1 FM	98	}
47ab5ad1 FM	99
855f18ea WD	100	#ifdef CONFIG_REGEX
	101
	102	#include <slre.h>
	103
855f18ea WD	104	/*
	105	* memstr - Find the first substring in memory
	106	* @s1: The string to be searched
	107	* @s2: The string to search for
	108	*
	109	* Similar to and based on strstr(),
	110	* but strings do not need to be NUL terminated.
	111	*/
	112	static char memstr(const char s1, int l1, const char *s2, int l2)
	113	{
	114	if (!l2)
	115	return (char *)s1;
	116
	117	while (l1 >= l2) {
	118	l1--;
	119	if (!memcmp(s1, s2, l2))
	120	return (char *)s1;
	121	s1++;
	122	}
	123	return NULL;
	124	}
	125
56331b26 SG	126	/**
	127	* substitute() - Substitute part of one string with another
	128	*
	129	* This updates @string so that the first occurrence of @old is replaced with
	130	* @new
	131	*
	132	* @string: String buffer containing string to update at the start
	133	* @slen: Pointer to current string length, updated on success
	134	* @ssize: Size of string buffer
	135	* @old: Old string to find in the buffer (no terminator needed)
	136	* @olen: Length of @old excluding terminator
	137	* @new: New string to replace @old with
	138	* @nlen: Length of @new excluding terminator
	139	* @return pointer to immediately after the copied @new in @string, or NULL if
	140	* no replacement took place
	141	*/
	142	static char substitute(char string, int *slen, int ssize,
	143	const char old, int olen, const char new, int nlen)
855f18ea WD	144	{
	145	char p = memstr(string, slen, old, olen);
	146
	147	if (p == NULL)
	148	return NULL;
	149
	150	debug("## Match at pos %ld: match len %d, subst len %d\n",
	151	(long)(p - string), olen, nlen);
	152
	153	/* make sure replacement matches */
	154	if (*slen + nlen - olen > ssize) {
	155	printf("## error: substitution buffer overflow\n");
	156	return NULL;
	157	}
	158
	159	/* move tail if needed */
	160	if (olen != nlen) {
	161	int tail, len;
	162
	163	len = (olen > nlen) ? olen : nlen;
	164
	165	tail = ssize - (p + len - string);
	166
	167	debug("## tail len %d\n", tail);
	168
	169	memmove(p + nlen, p + olen, tail);
	170	}
	171
56331b26	172	/* insert substitute */
855f18ea WD	173	memcpy(p, new, nlen);
	174
	175	*slen += nlen - olen;
	176
	177	return p + nlen;
	178	}
	179
d422c77a SG	180	int setexpr_regex_sub(char data, uint data_size, char nbuf, uint nbuf_size,
d422c77a SG	181	const char r, const char s, bool global)
855f18ea WD	182	{
855f18ea WD	183	struct slre slre;
855f18ea	184	char *datap = data;
855f18ea WD	185	int res, len, nlen, loop;
855f18ea WD	186
855f18ea WD	187	if (slre_compile(&slre, r) == 0) {
	188	printf("Error compiling regex: %s\n", slre.err_str);
	189	return 1;
	190	}
	191
56331b26	192	len = strlen(data);
855f18ea WD	193	for (loop = 0;; loop++) {
855f18ea WD	194	struct cap caps[slre.num_caps + 2];
855f18ea WD	195	const char *old;
	196	char *np;
	197	int i, olen;
	198
	199	(void) memset(caps, 0, sizeof(caps));
	200
8f4aa7dd	201	res = slre_match(&slre, datap, len - (datap - data), caps);
855f18ea WD	202
	203	debug("Result: %d\n", res);
	204
8f4aa7dd	205	for (i = 0; i <= slre.num_caps; i++) {
855f18ea WD	206	if (caps[i].len > 0) {
	207	debug("Substring %d: [%.*s]\n", i,
	208	caps[i].len, caps[i].ptr);
	209	}
	210	}
	211
	212	if (res == 0) {
	213	if (loop == 0) {
56331b26	214	printf("%s: No match\n", data);
855f18ea WD	215	return 1;
	216	} else {
	217	break;
	218	}
	219	}
	220
	221	debug("## MATCH ## %s\n", data);
	222
56331b26	223	if (!s)
855f18ea	224	return 1;
855f18ea WD	225
	226	old = caps[0].ptr;
	227	olen = caps[0].len;
9528229f	228	nlen = strlen(s);
855f18ea	229
56331b26	230	if (nlen + 1 >= nbuf_size) {
855f18ea	231	printf("## error: pattern buffer overflow: have %d, need %d\n",
56331b26	232	nbuf_size, nlen + 1);
855f18ea WD	233	return 1;
	234	}
	235	strcpy(nbuf, s);
	236
	237	debug("## SUBST(1) ## %s\n", nbuf);
	238
	239	/*
	240	* Handle back references
	241	*
	242	* Support for \0 ... \9, where \0 is the
	243	* whole matched pattern (similar to &).
	244	*
	245	* Implementation is a bit simpleminded as
	246	* backrefs are substituted sequentially, one
	247	* by one. This will lead to somewhat
	248	* unexpected results if the replacement
	249	* strings contain any \N strings then then
	250	* may get substitued, too. We accept this
	251	* restriction for the sake of simplicity.
	252	*/
	253	for (i = 0; i < 10; ++i) {
	254	char backref[2] = {
	255	'\\',
	256	'0',
	257	};
	258
	259	if (caps[i].len == 0)
	260	break;
	261
	262	backref[1] += i;
	263
	264	debug("## BACKREF %d: replace \"%.s\" by \"%.s\" in \"%s\"\n",
	265	i,
	266	2, backref,
	267	caps[i].len, caps[i].ptr,
	268	nbuf);
	269
	270	for (np = nbuf;;) {
	271	char *p = memstr(np, nlen, backref, 2);
	272
	273	if (p == NULL)
	274	break;
	275
	276	np = substitute(np, &nlen,
8f4aa7dd	277	nbuf_size - (np - nbuf),
855f18ea WD	278	backref, 2,
	279	caps[i].ptr, caps[i].len);
	280
	281	if (np == NULL)
	282	return 1;
	283	}
	284	}
	285	debug("## SUBST(2) ## %s\n", nbuf);
	286
8f4aa7dd SG	287	datap = substitute(datap, &len, data_size - (datap - data),
8f4aa7dd SG	288	old, olen, nbuf, nlen);
855f18ea WD	289
	290	if (datap == NULL)
	291	return 1;
	292
	293	debug("## REMAINDER: %s\n", datap);
	294
	295	debug("## RESULT: %s\n", data);
	296
	297	if (!global)
	298	break;
	299	}
382bee57	300	debug("## FINAL (now env_set()) : %s\n", data);
855f18ea	301
56331b26 SG	302	return 0;
	303	}
	304
	305	#define SLRE_BUFSZ 16384
	306	#define SLRE_PATSZ 4096
	307
	308	/*
	309	* Perform regex operations on a environment variable
	310	*
	311	* Returns 0 if OK, 1 in case of errors.
	312	*/
	313	static int regex_sub_var(const char name, const char r, const char *s,
	314	const char *t, int global)
	315	{
	316	struct slre slre;
	317	char data[SLRE_BUFSZ];
	318	char nbuf[SLRE_PATSZ];
	319	const char *value;
	320	int len;
	321	int ret;
	322
	323	if (!name)
	324	return 1;
	325
	326	if (slre_compile(&slre, r) == 0) {
	327	printf("Error compiling regex: %s\n", slre.err_str);
	328	return 1;
	329	}
	330
	331	if (!t) {
	332	value = env_get(name);
	333	if (!value) {
	334	printf("## Error: variable \"%s\" not defined\n", name);
	335	return 1;
	336	}
	337	t = value;
	338	}
	339
	340	debug("REGEX on %s=%s\n", name, t);
	341	debug("REGEX=\"%s\", SUBST=\"%s\", GLOBAL=%d\n", r, s ? s : "<NULL>",
	342	global);
	343
	344	len = strlen(t);
	345	if (len + 1 > SLRE_BUFSZ) {
	346	printf("## error: subst buffer overflow: have %d, need %d\n",
	347	SLRE_BUFSZ, len + 1);
	348	return 1;
	349	}
	350
	351	strcpy(data, t);
	352
d422c77a SG	353	ret = setexpr_regex_sub(data, SLRE_BUFSZ, nbuf, SLRE_PATSZ, r, s,
d422c77a SG	354	global);
56331b26 SG	355	if (ret)
	356	return 1;
	357
855f18ea WD	358	printf("%s=%s\n", name, data);
855f18ea WD	359
382bee57	360	return env_set(name, data);
855f18ea WD	361	}
	362	#endif
	363
09140113 SG	364	static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	365	char *const argv[])
d058698f	366	{
f66bee41	367	struct expr_arg aval, bval;
41ef372c	368	ulong value;
2c02152a	369	int ret = 0;
47ab5ad1	370	int w;
d058698f	371
855f18ea WD	372	/*
	373	* We take 3, 5, or 6 arguments:
	374	* 3 : setexpr name value
	375	* 5 : setexpr name val1 op val2
	376	* setexpr name [g]sub r s
	377	* 6 : setexpr name [g]sub r s t
	378	*/
	379
	380	/* > 6 already tested by max command args */
	381	if ((argc < 3) \|\| (argc == 4))
4c12eeb8	382	return CMD_RET_USAGE;
d058698f	383
47ab5ad1 FM	384	w = cmd_get_data_size(argv[0], 4);
47ab5ad1 FM	385
f66bee41 SG	386	if (get_arg(argv[2], w, &aval))
f66bee41 SG	387	return CMD_RET_FAILURE;
4823b45d	388
103c94b1	389	/* plain assignment: "setexpr name value" */
2c02152a SG	390	if (argc == 3) {
	391	if (w == CMD_DATA_SIZE_STR) {
	392	ret = env_set(argv[1], aval.sval);
	393	free(aval.sval);
	394	} else {
	395	ret = env_set_hex(argv[1], aval.ival);
	396	}
	397
	398	return ret;
	399	}
4823b45d	400
855f18ea WD	401	/* 5 or 6 args (6 args only with [g]sub) */
	402	#ifdef CONFIG_REGEX
	403	/*
	404	* rexep handling: "setexpr name [g]sub r s [t]"
	405	* with 5 args, "t" will be NULL
	406	*/
	407	if (strcmp(argv[2], "gsub") == 0)
56331b26	408	return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 1);
855f18ea WD	409
855f18ea WD	410	if (strcmp(argv[2], "sub") == 0)
56331b26	411	return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 0);
855f18ea WD	412	#endif
855f18ea WD	413
103c94b1 WD	414	/* standard operators: "setexpr name val1 op val2" */
	415	if (argc != 5)
	416	return CMD_RET_USAGE;
	417
	418	if (strlen(argv[3]) != 1)
	419	return CMD_RET_USAGE;
	420
2c02152a SG	421	if (get_arg(argv[4], w, &bval)) {
	422	if (w == CMD_DATA_SIZE_STR)
	423	free(aval.sval);
f66bee41	424	return CMD_RET_FAILURE;
2c02152a SG	425	}
	426
	427	if (w == CMD_DATA_SIZE_STR) {
	428	int len;
	429	char *str;
d058698f	430
2c02152a SG	431	switch (argv[3][0]) {
	432	case '+':
	433	len = strlen(aval.sval) + strlen(bval.sval) + 1;
	434	str = malloc(len);
	435	if (!str) {
	436	printf("Out of memory\n");
	437	ret = CMD_RET_FAILURE;
	438	} else {
	439	/* These were copied out and checked earlier */
	440	strcpy(str, aval.sval);
	441	strcat(str, bval.sval);
	442	ret = env_set(argv[1], str);
	443	if (ret)
	444	printf("Could not set var\n");
	445	free(str);
	446	}
	447	break;
	448	default:
	449	printf("invalid op\n");
	450	ret = 1;
	451	}
	452	} else {
f66bee41 SG	453	ulong a = aval.ival;
	454	ulong b = bval.ival;
	455
	456	switch (argv[3][0]) {
	457	case '\|':
	458	value = a \| b;
	459	break;
	460	case '&':
	461	value = a & b;
	462	break;
	463	case '+':
	464	value = a + b;
	465	break;
	466	case '^':
	467	value = a ^ b;
	468	break;
	469	case '-':
	470	value = a - b;
	471	break;
	472	case '*':
	473	value = a * b;
	474	break;
	475	case '/':
	476	value = a / b;
	477	break;
	478	case '%':
	479	value = a % b;
	480	break;
	481	default:
	482	printf("invalid op\n");
	483	return 1;
	484	}
	485
	486	env_set_hex(argv[1], value);
	487	}
d058698f	488
2c02152a SG	489	if (w == CMD_DATA_SIZE_STR) {
	490	free(aval.sval);
	491	free(bval.sval);
	492	}
	493
	494	return ret;
d058698f KG	495	}
	496
	497	U_BOOT_CMD(
855f18ea	498	setexpr, 6, 0, do_setexpr,
2fb2604d	499	"set environment variable as the result of eval expression",
2c02152a	500	"[.b, .w, .l, .s] name []value1 <op> []value2\n"
d058698f	501	" - set environment variable 'name' to the result of the evaluated\n"
855f18ea	502	" expression specified by <op>. <op> can be &, \|, ^, +, -, *, /, %\n"
2c02152a	503	" (for strings only + is supported)\n"
4823b45d JH	504	" size argument is only meaningful if value1 and/or value2 are\n"
4823b45d JH	505	" memory addresses (*)\n"
103c94b1 WD	506	"setexpr[.b, .w, .l] name [*]value\n"
103c94b1 WD	507	" - load a value into a variable"
855f18ea WD	508	#ifdef CONFIG_REGEX
	509	"\n"
	510	"setexpr name gsub r s [t]\n"
	511	" - For each substring matching the regular expression <r> in the\n"
	512	" string <t>, substitute the string <s>. The result is\n"
	513	" assigned to <name>. If <t> is not supplied, use the old\n"
	514	" value of <name>\n"
	515	"setexpr name sub r s [t]\n"
	516	" - Just like gsub(), but replace only the first matching substring"
	517	#endif
d058698f	518	);