[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 <ctype.h>
#include <env.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <linux/sizes.h>
#include "printf.h"

#define MAX_STR_LEN 128

/**
 * 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 = hextoul(&s[1], NULL);
		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 = hextoul(s, NULL);
	}
	*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, except fmt operation, which
	 * takes 4 to 8 arguments (limited by _maxargs):
	 * 3 : setexpr name value
	 * 5 : setexpr name val1 op val2
	 *     setexpr name [g]sub r s
	 * 6 : setexpr name [g]sub r s t
	 *     setexpr name fmt format [val1] [val2] [val3] [val4]
	 */

	if (argc < 3)
		return CMD_RET_USAGE;

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

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

	/* format string assignment: "setexpr name fmt %d value" */
	if (strcmp(argv[2], "fmt") == 0 && IS_ENABLED(CONFIG_CMD_SETEXPR_FMT)) {
		char str[MAX_STR_LEN];
		int result;

		if (argc == 3)
			return CMD_RET_USAGE;

		result = printf_setexpr(str, sizeof(str), argc - 3, &argv[3]);
		if (result)
			return result;

		return env_set(argv[1], str);
	}

	if (argc == 4 || argc > 6)
		return CMD_RET_USAGE;

	/* 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, 8, 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_CMD_SETEXPR_FMT
	"\n"
	"setexpr name fmt <format> [value1] [value2] [value3] [value4]\n"
	"    - set environment variable 'name' to the result of the bash like\n"
	"      format string evaluation of value."
#endif
#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>
f4f8d8bb	14	#include <ctype.h>
c7694dd4	15	#include <env.h>
f7ae49fc	16	#include <log.h>
2c02152a	17	#include <malloc.h>
2068cea1	18	#include <mapmem.h>
2c02152a	19	#include <linux/sizes.h>
f4f8d8bb RG	20	#include "printf.h"
	21
	22	#define MAX_STR_LEN 128
d058698f	23
f66bee41 SG	24	/**
	25	* struct expr_arg: Holds an argument to an expression
	26	*
	27	* @ival: Integer value (if width is not CMD_DATA_SIZE_STR)
2c02152a	28	* @sval: String value (if width is CMD_DATA_SIZE_STR)
f66bee41 SG	29	*/
f66bee41 SG	30	struct expr_arg {
2c02152a SG	31	union {
	32	ulong ival;
	33	char *sval;
	34	};
f66bee41 SG	35	};
	36
	37	static int get_arg(char s, int w, struct expr_arg argp)
47ab5ad1	38	{
f66bee41 SG	39	struct expr_arg arg;
f66bee41 SG	40
482126e2	41	/*
2068cea1 JH	42	* If the parameter starts with a '*' then assume it is a pointer to
2068cea1 JH	43	* the value we want.
47ab5ad1	44	*/
47ab5ad1	45	if (s[0] == '*') {
2068cea1 JH	46	ulong *p;
	47	ulong addr;
	48	ulong val;
2c02152a SG	49	int len;
2c02152a SG	50	char *str;
2068cea1	51
7e5f460e	52	addr = hextoul(&s[1], NULL);
47ab5ad1	53	switch (w) {
2068cea1 JH	54	case 1:
	55	p = map_sysmem(addr, sizeof(uchar));
	56	val = (ulong)(uchar )p;
	57	unmap_sysmem(p);
f66bee41 SG	58	arg.ival = val;
f66bee41 SG	59	break;
2068cea1 JH	60	case 2:
	61	p = map_sysmem(addr, sizeof(ushort));
	62	val = (ulong)(ushort )p;
	63	unmap_sysmem(p);
f66bee41 SG	64	arg.ival = val;
f66bee41 SG	65	break;
2c02152a SG	66	case CMD_DATA_SIZE_STR:
	67	p = map_sysmem(addr, SZ_64K);
	68
	69	/* Maximum string length of 64KB plus terminator */
	70	len = strnlen((char *)p, SZ_64K) + 1;
	71	str = malloc(len);
	72	if (!str) {
	73	printf("Out of memory\n");
	74	return -ENOMEM;
	75	}
	76	memcpy(str, p, len);
	77	str[len - 1] = '\0';
	78	unmap_sysmem(p);
	79	arg.sval = str;
	80	break;
47ab5ad1	81	case 4:
25a43ac8 SG	82	p = map_sysmem(addr, sizeof(u32));
	83	val = (u32 )p;
	84	unmap_sysmem(p);
f66bee41 SG	85	arg.ival = val;
f66bee41 SG	86	break;
2068cea1 JH	87	default:
	88	p = map_sysmem(addr, sizeof(ulong));
	89	val = *p;
	90	unmap_sysmem(p);
f66bee41 SG	91	arg.ival = val;
f66bee41 SG	92	break;
47ab5ad1 FM	93	}
47ab5ad1 FM	94	} else {
2c02152a SG	95	if (w == CMD_DATA_SIZE_STR)
2c02152a SG	96	return -EINVAL;
7e5f460e	97	arg.ival = hextoul(s, NULL);
47ab5ad1	98	}
f66bee41 SG	99	*argp = arg;
	100
	101	return 0;
47ab5ad1 FM	102	}
47ab5ad1 FM	103
855f18ea WD	104	#ifdef CONFIG_REGEX
	105
	106	#include <slre.h>
	107
855f18ea WD	108	/*
	109	* memstr - Find the first substring in memory
	110	* @s1: The string to be searched
	111	* @s2: The string to search for
	112	*
	113	* Similar to and based on strstr(),
	114	* but strings do not need to be NUL terminated.
	115	*/
	116	static char memstr(const char s1, int l1, const char *s2, int l2)
	117	{
	118	if (!l2)
	119	return (char *)s1;
	120
	121	while (l1 >= l2) {
	122	l1--;
	123	if (!memcmp(s1, s2, l2))
	124	return (char *)s1;
	125	s1++;
	126	}
	127	return NULL;
	128	}
	129
56331b26 SG	130	/**
	131	* substitute() - Substitute part of one string with another
	132	*
	133	* This updates @string so that the first occurrence of @old is replaced with
	134	* @new
	135	*
	136	* @string: String buffer containing string to update at the start
	137	* @slen: Pointer to current string length, updated on success
	138	* @ssize: Size of string buffer
	139	* @old: Old string to find in the buffer (no terminator needed)
	140	* @olen: Length of @old excluding terminator
	141	* @new: New string to replace @old with
	142	* @nlen: Length of @new excluding terminator
185f812c	143	* Return: pointer to immediately after the copied @new in @string, or NULL if
56331b26 SG	144	* no replacement took place
	145	*/
	146	static char substitute(char string, int *slen, int ssize,
	147	const char old, int olen, const char new, int nlen)
855f18ea WD	148	{
	149	char p = memstr(string, slen, old, olen);
	150
	151	if (p == NULL)
	152	return NULL;
	153
	154	debug("## Match at pos %ld: match len %d, subst len %d\n",
	155	(long)(p - string), olen, nlen);
	156
	157	/* make sure replacement matches */
	158	if (*slen + nlen - olen > ssize) {
	159	printf("## error: substitution buffer overflow\n");
	160	return NULL;
	161	}
	162
	163	/* move tail if needed */
	164	if (olen != nlen) {
	165	int tail, len;
	166
	167	len = (olen > nlen) ? olen : nlen;
	168
	169	tail = ssize - (p + len - string);
	170
	171	debug("## tail len %d\n", tail);
	172
	173	memmove(p + nlen, p + olen, tail);
	174	}
	175
56331b26	176	/* insert substitute */
855f18ea WD	177	memcpy(p, new, nlen);
	178
	179	*slen += nlen - olen;
	180
	181	return p + nlen;
	182	}
	183
d422c77a SG	184	int setexpr_regex_sub(char data, uint data_size, char nbuf, uint nbuf_size,
d422c77a SG	185	const char r, const char s, bool global)
855f18ea WD	186	{
855f18ea WD	187	struct slre slre;
855f18ea	188	char *datap = data;
855f18ea WD	189	int res, len, nlen, loop;
855f18ea WD	190
855f18ea WD	191	if (slre_compile(&slre, r) == 0) {
	192	printf("Error compiling regex: %s\n", slre.err_str);
	193	return 1;
	194	}
	195
56331b26	196	len = strlen(data);
855f18ea WD	197	for (loop = 0;; loop++) {
855f18ea WD	198	struct cap caps[slre.num_caps + 2];
855f18ea WD	199	const char *old;
	200	char *np;
	201	int i, olen;
	202
	203	(void) memset(caps, 0, sizeof(caps));
	204
8f4aa7dd	205	res = slre_match(&slre, datap, len - (datap - data), caps);
855f18ea WD	206
	207	debug("Result: %d\n", res);
	208
8f4aa7dd	209	for (i = 0; i <= slre.num_caps; i++) {
855f18ea WD	210	if (caps[i].len > 0) {
	211	debug("Substring %d: [%.*s]\n", i,
	212	caps[i].len, caps[i].ptr);
	213	}
	214	}
	215
	216	if (res == 0) {
	217	if (loop == 0) {
56331b26	218	printf("%s: No match\n", data);
855f18ea WD	219	return 1;
	220	} else {
	221	break;
	222	}
	223	}
	224
	225	debug("## MATCH ## %s\n", data);
	226
56331b26	227	if (!s)
855f18ea	228	return 1;
855f18ea WD	229
	230	old = caps[0].ptr;
	231	olen = caps[0].len;
9528229f	232	nlen = strlen(s);
855f18ea	233
56331b26	234	if (nlen + 1 >= nbuf_size) {
855f18ea	235	printf("## error: pattern buffer overflow: have %d, need %d\n",
56331b26	236	nbuf_size, nlen + 1);
855f18ea WD	237	return 1;
	238	}
	239	strcpy(nbuf, s);
	240
	241	debug("## SUBST(1) ## %s\n", nbuf);
	242
	243	/*
	244	* Handle back references
	245	*
	246	* Support for \0 ... \9, where \0 is the
	247	* whole matched pattern (similar to &).
	248	*
	249	* Implementation is a bit simpleminded as
	250	* backrefs are substituted sequentially, one
	251	* by one. This will lead to somewhat
	252	* unexpected results if the replacement
	253	* strings contain any \N strings then then
	254	* may get substitued, too. We accept this
	255	* restriction for the sake of simplicity.
	256	*/
	257	for (i = 0; i < 10; ++i) {
	258	char backref[2] = {
	259	'\\',
	260	'0',
	261	};
	262
	263	if (caps[i].len == 0)
	264	break;
	265
	266	backref[1] += i;
	267
	268	debug("## BACKREF %d: replace \"%.s\" by \"%.s\" in \"%s\"\n",
	269	i,
	270	2, backref,
	271	caps[i].len, caps[i].ptr,
	272	nbuf);
	273
	274	for (np = nbuf;;) {
	275	char *p = memstr(np, nlen, backref, 2);
	276
	277	if (p == NULL)
	278	break;
	279
	280	np = substitute(np, &nlen,
8f4aa7dd	281	nbuf_size - (np - nbuf),
855f18ea WD	282	backref, 2,
	283	caps[i].ptr, caps[i].len);
	284
	285	if (np == NULL)
	286	return 1;
	287	}
	288	}
	289	debug("## SUBST(2) ## %s\n", nbuf);
	290
8f4aa7dd SG	291	datap = substitute(datap, &len, data_size - (datap - data),
8f4aa7dd SG	292	old, olen, nbuf, nlen);
855f18ea WD	293
	294	if (datap == NULL)
	295	return 1;
	296
	297	debug("## REMAINDER: %s\n", datap);
	298
	299	debug("## RESULT: %s\n", data);
	300
	301	if (!global)
	302	break;
	303	}
382bee57	304	debug("## FINAL (now env_set()) : %s\n", data);
855f18ea	305
56331b26 SG	306	return 0;
	307	}
	308
	309	#define SLRE_BUFSZ 16384
	310	#define SLRE_PATSZ 4096
	311
	312	/*
	313	* Perform regex operations on a environment variable
	314	*
	315	* Returns 0 if OK, 1 in case of errors.
	316	*/
	317	static int regex_sub_var(const char name, const char r, const char *s,
	318	const char *t, int global)
	319	{
	320	struct slre slre;
	321	char data[SLRE_BUFSZ];
	322	char nbuf[SLRE_PATSZ];
	323	const char *value;
	324	int len;
	325	int ret;
	326
	327	if (!name)
	328	return 1;
	329
	330	if (slre_compile(&slre, r) == 0) {
	331	printf("Error compiling regex: %s\n", slre.err_str);
	332	return 1;
	333	}
	334
	335	if (!t) {
	336	value = env_get(name);
	337	if (!value) {
	338	printf("## Error: variable \"%s\" not defined\n", name);
	339	return 1;
	340	}
	341	t = value;
	342	}
	343
	344	debug("REGEX on %s=%s\n", name, t);
	345	debug("REGEX=\"%s\", SUBST=\"%s\", GLOBAL=%d\n", r, s ? s : "<NULL>",
	346	global);
	347
	348	len = strlen(t);
	349	if (len + 1 > SLRE_BUFSZ) {
	350	printf("## error: subst buffer overflow: have %d, need %d\n",
	351	SLRE_BUFSZ, len + 1);
	352	return 1;
	353	}
	354
	355	strcpy(data, t);
	356
d422c77a SG	357	ret = setexpr_regex_sub(data, SLRE_BUFSZ, nbuf, SLRE_PATSZ, r, s,
d422c77a SG	358	global);
56331b26 SG	359	if (ret)
	360	return 1;
	361
855f18ea WD	362	printf("%s=%s\n", name, data);
855f18ea WD	363
382bee57	364	return env_set(name, data);
855f18ea WD	365	}
	366	#endif
	367
09140113 SG	368	static int do_setexpr(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	369	char *const argv[])
d058698f	370	{
f66bee41	371	struct expr_arg aval, bval;
41ef372c	372	ulong value;
2c02152a	373	int ret = 0;
47ab5ad1	374	int w;
d058698f	375
855f18ea	376	/*
f4f8d8bb RG	377	* We take 3, 5, or 6 arguments, except fmt operation, which
f4f8d8bb RG	378	* takes 4 to 8 arguments (limited by _maxargs):
855f18ea WD	379	* 3 : setexpr name value
	380	* 5 : setexpr name val1 op val2
	381	* setexpr name [g]sub r s
	382	* 6 : setexpr name [g]sub r s t
f4f8d8bb	383	* setexpr name fmt format [val1] [val2] [val3] [val4]
855f18ea WD	384	*/
855f18ea WD	385
f4f8d8bb	386	if (argc < 3)
4c12eeb8	387	return CMD_RET_USAGE;
d058698f	388
47ab5ad1 FM	389	w = cmd_get_data_size(argv[0], 4);
47ab5ad1 FM	390
f66bee41 SG	391	if (get_arg(argv[2], w, &aval))
f66bee41 SG	392	return CMD_RET_FAILURE;
4823b45d	393
f4f8d8bb RG	394	/* format string assignment: "setexpr name fmt %d value" */
	395	if (strcmp(argv[2], "fmt") == 0 && IS_ENABLED(CONFIG_CMD_SETEXPR_FMT)) {
	396	char str[MAX_STR_LEN];
	397	int result;
	398
	399	if (argc == 3)
	400	return CMD_RET_USAGE;
	401
	402	result = printf_setexpr(str, sizeof(str), argc - 3, &argv[3]);
	403	if (result)
	404	return result;
	405
	406	return env_set(argv[1], str);
	407	}
	408
	409	if (argc == 4 \|\| argc > 6)
	410	return CMD_RET_USAGE;
	411
103c94b1	412	/* plain assignment: "setexpr name value" */
2c02152a SG	413	if (argc == 3) {
	414	if (w == CMD_DATA_SIZE_STR) {
	415	ret = env_set(argv[1], aval.sval);
	416	free(aval.sval);
	417	} else {
	418	ret = env_set_hex(argv[1], aval.ival);
	419	}
	420
	421	return ret;
	422	}
4823b45d	423
855f18ea WD	424	/* 5 or 6 args (6 args only with [g]sub) */
	425	#ifdef CONFIG_REGEX
	426	/*
	427	* rexep handling: "setexpr name [g]sub r s [t]"
	428	* with 5 args, "t" will be NULL
	429	*/
	430	if (strcmp(argv[2], "gsub") == 0)
56331b26	431	return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 1);
855f18ea WD	432
855f18ea WD	433	if (strcmp(argv[2], "sub") == 0)
56331b26	434	return regex_sub_var(argv[1], argv[3], argv[4], argv[5], 0);
855f18ea WD	435	#endif
855f18ea WD	436
103c94b1 WD	437	/* standard operators: "setexpr name val1 op val2" */
	438	if (argc != 5)
	439	return CMD_RET_USAGE;
	440
	441	if (strlen(argv[3]) != 1)
	442	return CMD_RET_USAGE;
	443
2c02152a SG	444	if (get_arg(argv[4], w, &bval)) {
	445	if (w == CMD_DATA_SIZE_STR)
	446	free(aval.sval);
f66bee41	447	return CMD_RET_FAILURE;
2c02152a SG	448	}
	449
	450	if (w == CMD_DATA_SIZE_STR) {
	451	int len;
	452	char *str;
d058698f	453
2c02152a SG	454	switch (argv[3][0]) {
	455	case '+':
	456	len = strlen(aval.sval) + strlen(bval.sval) + 1;
	457	str = malloc(len);
	458	if (!str) {
	459	printf("Out of memory\n");
	460	ret = CMD_RET_FAILURE;
	461	} else {
	462	/* These were copied out and checked earlier */
	463	strcpy(str, aval.sval);
	464	strcat(str, bval.sval);
	465	ret = env_set(argv[1], str);
	466	if (ret)
	467	printf("Could not set var\n");
	468	free(str);
	469	}
	470	break;
	471	default:
	472	printf("invalid op\n");
	473	ret = 1;
	474	}
	475	} else {
f66bee41 SG	476	ulong a = aval.ival;
	477	ulong b = bval.ival;
	478
	479	switch (argv[3][0]) {
	480	case '\|':
	481	value = a \| b;
	482	break;
	483	case '&':
	484	value = a & b;
	485	break;
	486	case '+':
	487	value = a + b;
	488	break;
	489	case '^':
	490	value = a ^ b;
	491	break;
	492	case '-':
	493	value = a - b;
	494	break;
	495	case '*':
	496	value = a * b;
	497	break;
	498	case '/':
	499	value = a / b;
	500	break;
	501	case '%':
	502	value = a % b;
	503	break;
	504	default:
	505	printf("invalid op\n");
	506	return 1;
	507	}
	508
	509	env_set_hex(argv[1], value);
	510	}
d058698f	511
2c02152a SG	512	if (w == CMD_DATA_SIZE_STR) {
	513	free(aval.sval);
	514	free(bval.sval);
	515	}
	516
	517	return ret;
d058698f KG	518	}
	519
	520	U_BOOT_CMD(
f4f8d8bb	521	setexpr, 8, 0, do_setexpr,
2fb2604d	522	"set environment variable as the result of eval expression",
2c02152a	523	"[.b, .w, .l, .s] name []value1 <op> []value2\n"
d058698f	524	" - set environment variable 'name' to the result of the evaluated\n"
855f18ea	525	" expression specified by <op>. <op> can be &, \|, ^, +, -, *, /, %\n"
2c02152a	526	" (for strings only + is supported)\n"
4823b45d JH	527	" size argument is only meaningful if value1 and/or value2 are\n"
4823b45d JH	528	" memory addresses (*)\n"
103c94b1 WD	529	"setexpr[.b, .w, .l] name [*]value\n"
103c94b1 WD	530	" - load a value into a variable"
f4f8d8bb RG	531	#ifdef CONFIG_CMD_SETEXPR_FMT
	532	"\n"
	533	"setexpr name fmt <format> [value1] [value2] [value3] [value4]\n"
	534	" - set environment variable 'name' to the result of the bash like\n"
	535	" format string evaluation of value."
	536	#endif
855f18ea WD	537	#ifdef CONFIG_REGEX
	538	"\n"
	539	"setexpr name gsub r s [t]\n"
	540	" - For each substring matching the regular expression <r> in the\n"
	541	" string <t>, substitute the string <s>. The result is\n"
	542	" assigned to <name>. If <t> is not supplied, use the old\n"
	543	" value of <name>\n"
	544	"setexpr name sub r s [t]\n"
	545	" - Just like gsub(), but replace only the first matching substring"
	546	#endif
d058698f	547	);