cmd_itest.c
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/*
* (C) Copyright 2003
* Tait Electronics Limited, Christchurch, New Zealand
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* This file provides a shell like 'test' function to return
* true/false from an integer or string compare of two memory
* locations or a location and a scalar/literal.
* A few parts were lifted from bash 'test' command
*/
#include <common.h>
#include <config.h>
#include <command.h>
#define EQ 0
#define NE 1
#define LT 2
#define GT 3
#define LE 4
#define GE 5
struct op_tbl_s {
char *op; /* operator string */
int opcode; /* internal representation of opcode */
};
typedef struct op_tbl_s op_tbl_t;
static const op_tbl_t op_table [] = {
{ "-lt", LT },
{ "<" , LT },
{ "-gt", GT },
{ ">" , GT },
{ "-eq", EQ },
{ "==" , EQ },
{ "-ne", NE },
{ "!=" , NE },
{ "<>" , NE },
{ "-ge", GE },
{ ">=" , GE },
{ "-le", LE },
{ "<=" , LE },
};
static long evalexp(char *s, int w)
{
long l = 0;
long *p;
/* if the parameter starts with a * then assume is a pointer to the value we want */
if (s[0] == '*') {
p = (long *)simple_strtoul(&s[1], NULL, 16);
switch (w) {
case 1: return((long)(*(unsigned char *)p));
case 2: return((long)(*(unsigned short *)p));
case 4: return(*p);
}
} else {
l = simple_strtoul(s, NULL, 16);
}
return l & ((1UL << (w * 8)) - 1);
}
static char * evalstr(char *s)
{
/* if the parameter starts with a * then assume a string pointer else its a literal */
if (s[0] == '*') {
return (char *)simple_strtoul(&s[1], NULL, 16);
} else if (s[0] == '$') {
int i = 2;
if (s[1] != '{')
return NULL;
while (s[i] != '}') {
if (s[i] == 0)
return NULL;
i++;
}
s[i] = 0;
return getenv((const char *)&s[2]);
} else {
return s;
}
}
static int stringcomp(char *s, char *t, int op)
{
int p;
char *l, *r;
l = evalstr(s);
r = evalstr(t);
p = strcmp(l, r);
switch (op) {
case EQ: return (p == 0);
case NE: return (p != 0);
case LT: return (p < 0);
case GT: return (p > 0);
case LE: return (p <= 0);
case GE: return (p >= 0);
}
return (0);
}
static int arithcomp (char *s, char *t, int op, int w)
{
long l, r;
l = evalexp (s, w);
r = evalexp (t, w);
switch (op) {
case EQ: return (l == r);
case NE: return (l != r);
case LT: return (l < r);
case GT: return (l > r);
case LE: return (l <= r);
case GE: return (l >= r);
}
return (0);
}
static int binary_test(char *op, char *arg1, char *arg2, int w)
{
int len, i;
const op_tbl_t *optp;
len = strlen(op);
for (optp = (op_tbl_t *)&op_table, i = 0;
i < ARRAY_SIZE(op_table);
optp++, i++) {
if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
if (w == 0) {
return (stringcomp(arg1, arg2, optp->opcode));
} else {
return (arithcomp (arg1, arg2, optp->opcode, w));
}
}
}
printf("Unknown operator '%s'\n", op);
return 0; /* op code not found */
}
/* command line interface to the shell test */
static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int value, w;
/* Validate arguments */
if ((argc != 4))
return CMD_RET_USAGE;
/* Check for a data width specification.
* Defaults to long (4) if no specification.
* Uses -2 as 'width' for .s (string) so as not to upset existing code
*/
switch (w = cmd_get_data_size(argv[0], 4)) {
case 1:
case 2:
case 4:
value = binary_test (argv[2], argv[1], argv[3], w);
break;
case -2:
value = binary_test (argv[2], argv[1], argv[3], 0);
break;
case -1:
default:
puts("Invalid data width specifier\n");
value = 0;
break;
}
return !value;
}
U_BOOT_CMD(
itest, 4, 0, do_itest,
"return true/false on integer compare",
"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
);