string.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
*
* Unit tests for memory functions
*
* The architecture dependent implementations run through different lines of
* code depending on the alignment and length of memory regions copied or set.
* This has to be considered in testing.
*/
#include <common.h>
#include <command.h>
#include <test/lib.h>
#include <test/test.h>
#include <test/ut.h>
/* Xor mask used for marking memory regions */
#define MASK 0xA5
/* Number of different alignment values */
#define SWEEP 16
/* Allow for copying up to 32 bytes */
#define BUFLEN (SWEEP + 33)
/**
* init_buffer() - initialize buffer
*
* The buffer is filled with incrementing values xor'ed with the mask.
*
* @buf: buffer
* @mask: xor mask
*/
static void init_buffer(u8 buf[], u8 mask)
{
int i;
for (i = 0; i < BUFLEN; ++i)
buf[i] = i ^ mask;
}
/**
* test_memset() - test result of memset()
*
* @uts: unit test state
* @buf: buffer
* @mask: value set by memset()
* @offset: relative start of region changed by memset() in buffer
* @len: length of region changed by memset()
* Return: 0 = success, 1 = failure
*/
static int test_memset(struct unit_test_state *uts, u8 buf[], u8 mask,
int offset, int len)
{
int i;
for (i = 0; i < BUFLEN; ++i) {
if (i < offset || i >= offset + len) {
ut_asserteq(i, buf[i]);
} else {
ut_asserteq(mask, buf[i]);
}
}
return 0;
}
/**
* lib_memset() - unit test for memset()
*
* Test memset() with varied alignment and length of the changed buffer.
*
* @uts: unit test state
* Return: 0 = success, 1 = failure
*/
static int lib_memset(struct unit_test_state *uts)
{
u8 buf[BUFLEN];
int offset, len;
void *ptr;
for (offset = 0; offset <= SWEEP; ++offset) {
for (len = 1; len < BUFLEN - SWEEP; ++len) {
init_buffer(buf, 0);
ptr = memset(buf + offset, MASK, len);
ut_asserteq_ptr(buf + offset, (u8 *)ptr);
if (test_memset(uts, buf, MASK, offset, len)) {
debug("%s: failure %d, %d\n",
__func__, offset, len);
return CMD_RET_FAILURE;
}
}
}
return 0;
}
LIB_TEST(lib_memset, 0);
/**
* test_memmove() - test result of memcpy() or memmove()
*
* @uts: unit test state
* @buf: buffer
* @mask: xor mask used to initialize source buffer
* @offset1: relative start of copied region in source buffer
* @offset2: relative start of copied region in destination buffer
* @len: length of region changed by memset()
* Return: 0 = success, 1 = failure
*/
static int test_memmove(struct unit_test_state *uts, u8 buf[], u8 mask,
int offset1, int offset2, int len)
{
int i;
for (i = 0; i < BUFLEN; ++i) {
if (i < offset2 || i >= offset2 + len) {
ut_asserteq(i, buf[i]);
} else {
ut_asserteq((i + offset1 - offset2) ^ mask, buf[i]);
}
}
return 0;
}
/**
* lib_memcpy() - unit test for memcpy()
*
* Test memcpy() with varied alignment and length of the copied buffer.
*
* @uts: unit test state
* Return: 0 = success, 1 = failure
*/
static int lib_memcpy(struct unit_test_state *uts)
{
u8 buf1[BUFLEN];
u8 buf2[BUFLEN];
int offset1, offset2, len;
void *ptr;
init_buffer(buf1, MASK);
for (offset1 = 0; offset1 <= SWEEP; ++offset1) {
for (offset2 = 0; offset2 <= SWEEP; ++offset2) {
for (len = 1; len < BUFLEN - SWEEP; ++len) {
init_buffer(buf2, 0);
ptr = memcpy(buf2 + offset2, buf1 + offset1,
len);
ut_asserteq_ptr(buf2 + offset2, (u8 *)ptr);
if (test_memmove(uts, buf2, MASK, offset1,
offset2, len)) {
debug("%s: failure %d, %d, %d\n",
__func__, offset1, offset2, len);
return CMD_RET_FAILURE;
}
}
}
}
return 0;
}
LIB_TEST(lib_memcpy, 0);
/**
* lib_memmove() - unit test for memmove()
*
* Test memmove() with varied alignment and length of the copied buffer.
*
* @uts: unit test state
* Return: 0 = success, 1 = failure
*/
static int lib_memmove(struct unit_test_state *uts)
{
u8 buf[BUFLEN];
int offset1, offset2, len;
void *ptr;
for (offset1 = 0; offset1 <= SWEEP; ++offset1) {
for (offset2 = 0; offset2 <= SWEEP; ++offset2) {
for (len = 1; len < BUFLEN - SWEEP; ++len) {
init_buffer(buf, 0);
ptr = memmove(buf + offset2, buf + offset1,
len);
ut_asserteq_ptr(buf + offset2, (u8 *)ptr);
if (test_memmove(uts, buf, 0, offset1, offset2,
len)) {
debug("%s: failure %d, %d, %d\n",
__func__, offset1, offset2, len);
return CMD_RET_FAILURE;
}
}
}
}
return 0;
}
LIB_TEST(lib_memmove, 0);