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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
208 lines
3.9 KiB
C
208 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2003
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* Tait Electronics Limited, Christchurch, New Zealand
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*/
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/*
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* This file provides a shell like 'test' function to return
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* true/false from an integer or string compare of two memory
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* locations or a location and a scalar/literal.
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* A few parts were lifted from bash 'test' command
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <mapmem.h>
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#include <asm/io.h>
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#define EQ 0
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#define NE 1
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#define LT 2
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#define GT 3
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#define LE 4
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#define GE 5
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struct op_tbl_s {
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char *op; /* operator string */
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int opcode; /* internal representation of opcode */
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};
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typedef struct op_tbl_s op_tbl_t;
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static const op_tbl_t op_table [] = {
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{ "-lt", LT },
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{ "<" , LT },
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{ "-gt", GT },
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{ ">" , GT },
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{ "-eq", EQ },
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{ "==" , EQ },
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{ "-ne", NE },
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{ "!=" , NE },
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{ "<>" , NE },
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{ "-ge", GE },
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{ ">=" , GE },
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{ "-le", LE },
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{ "<=" , LE },
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};
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static long evalexp(char *s, int w)
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{
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long l = 0;
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unsigned long addr;
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void *buf;
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/* if the parameter starts with a * then assume is a pointer to the value we want */
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if (s[0] == '*') {
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addr = simple_strtoul(&s[1], NULL, 16);
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buf = map_physmem(addr, w, MAP_WRBACK);
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if (!buf && addr) {
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puts("Failed to map physical memory\n");
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return 0;
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}
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switch (w) {
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case 1:
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l = (long)(*(u8 *)buf);
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break;
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case 2:
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l = (long)(*(u16 *)buf);
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break;
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case 4:
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l = (long)(*(u32 *)buf);
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break;
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}
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unmap_physmem(buf, w);
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return l;
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} else {
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l = simple_strtoul(s, NULL, 16);
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}
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/* avoid overflow on mask calculus */
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return (w >= sizeof(long)) ? l : (l & ((1UL << (w * 8)) - 1));
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}
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static char * evalstr(char *s)
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{
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/* if the parameter starts with a * then assume a string pointer else its a literal */
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if (s[0] == '*') {
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return (char *)simple_strtoul(&s[1], NULL, 16);
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} else if (s[0] == '$') {
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int i = 2;
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if (s[1] != '{')
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return NULL;
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while (s[i] != '}') {
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if (s[i] == 0)
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return NULL;
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i++;
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}
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s[i] = 0;
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return env_get((const char *)&s[2]);
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} else {
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return s;
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}
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}
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static int stringcomp(char *s, char *t, int op)
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{
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int p;
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char *l, *r;
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l = evalstr(s);
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r = evalstr(t);
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p = strcmp(l, r);
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switch (op) {
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case EQ: return (p == 0);
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case NE: return (p != 0);
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case LT: return (p < 0);
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case GT: return (p > 0);
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case LE: return (p <= 0);
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case GE: return (p >= 0);
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}
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return (0);
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}
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static int arithcomp (char *s, char *t, int op, int w)
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{
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long l, r;
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l = evalexp (s, w);
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r = evalexp (t, w);
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switch (op) {
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case EQ: return (l == r);
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case NE: return (l != r);
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case LT: return (l < r);
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case GT: return (l > r);
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case LE: return (l <= r);
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case GE: return (l >= r);
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}
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return (0);
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}
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static int binary_test(char *op, char *arg1, char *arg2, int w)
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{
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int len, i;
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const op_tbl_t *optp;
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len = strlen(op);
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for (optp = (op_tbl_t *)&op_table, i = 0;
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i < ARRAY_SIZE(op_table);
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optp++, i++) {
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if ((strncmp (op, optp->op, len) == 0) && (len == strlen (optp->op))) {
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if (w == 0) {
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return (stringcomp(arg1, arg2, optp->opcode));
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} else {
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return (arithcomp (arg1, arg2, optp->opcode, w));
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}
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}
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}
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printf("Unknown operator '%s'\n", op);
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return 0; /* op code not found */
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}
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/* command line interface to the shell test */
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static int do_itest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int value, w;
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/* Validate arguments */
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if ((argc != 4))
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return CMD_RET_USAGE;
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/* Check for a data width specification.
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* Defaults to long (4) if no specification.
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* Uses -2 as 'width' for .s (string) so as not to upset existing code
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*/
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switch (w = cmd_get_data_size(argv[0], 4)) {
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case 1:
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case 2:
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case 4:
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value = binary_test (argv[2], argv[1], argv[3], w);
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break;
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case -2:
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value = binary_test (argv[2], argv[1], argv[3], 0);
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break;
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case -1:
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default:
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puts("Invalid data width specifier\n");
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value = 0;
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break;
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}
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return !value;
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}
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U_BOOT_CMD(
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itest, 4, 0, do_itest,
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"return true/false on integer compare",
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"[.b, .w, .l, .s] [*]value1 <op> [*]value2"
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);
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