cmd/setexpr.c


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// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2008 Freescale Semiconductor, Inc.
 * Copyright 2013 Wolfgang Denk <wd@denx.de>
 */

/*
 * 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