94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ This program is free software; you can redistribute it and/or modify │
|
|
│ it under the terms of the GNU General Public License as published by │
|
|
│ the Free Software Foundation; version 2 of the License. │
|
|
│ │
|
|
│ This program is distributed in the hope that it will be useful, but │
|
|
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
|
|
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
|
|
│ General Public License for more details. │
|
|
│ │
|
|
│ You should have received a copy of the GNU General Public License │
|
|
│ along with this program; if not, write to the Free Software │
|
|
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
|
|
│ 02110-1301 USA │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/bits/bits.h"
|
|
#include "libc/bits/safemacros.h"
|
|
#include "libc/str/str.h"
|
|
#include "libc/testlib/testlib.h"
|
|
|
|
#define N 256
|
|
#define S 7
|
|
|
|
long i, j, n;
|
|
char *b1, *b2;
|
|
|
|
TEST(memmove, overlapping) {
|
|
for (i = 0; i < N; i += S) {
|
|
for (j = 10; j < N; j += S) {
|
|
b1 = tmalloc(N);
|
|
b2 = tmalloc(N);
|
|
n = min(N - i, N - j);
|
|
memcpy(b2, b1 + i, n);
|
|
ASSERT_EQ(b1 + j, memmove(b1 + j, b1 + i, n));
|
|
ASSERT_EQ(0, memcmp(b1 + j, b2, n));
|
|
tfree(b2);
|
|
tfree(b1);
|
|
}
|
|
}
|
|
}
|
|
|
|
TEST(memmove, overlappingDirect) {
|
|
for (i = 0; i < N; i += S) {
|
|
for (j = 10; j < N; j += S) {
|
|
b1 = tmalloc(N);
|
|
b2 = tmalloc(N);
|
|
n = min(N - i, N - j);
|
|
memcpy(b2, b1 + i, n);
|
|
ASSERT_EQ(b1 + j, (memmove)(b1 + j, b1 + i, n));
|
|
ASSERT_EQ(0, memcmp(b1 + j, b2, n));
|
|
tfree(b2);
|
|
tfree(b1);
|
|
}
|
|
}
|
|
}
|
|
|
|
char *MoveMemory(char *dst, const char *src, size_t n) {
|
|
size_t i;
|
|
for (i = 0; i < n; ++i) {
|
|
dst[i] = src[i];
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
TEST(memmove, overlappingBackwards_isGenerallySafe) {
|
|
char buf[32];
|
|
strcpy(buf, "abcdefghijklmnopqrstuvwxyz");
|
|
ASSERT_STREQ("cdefghijklmnopqrstuvwxyzyz", MoveMemory(buf, buf + 2, 24));
|
|
strcpy(buf, "abcdefghijklmnopqrstuvwxyz");
|
|
ASSERT_STREQ("cdefghijklmnopqrstuvwxyzyz", memmove(buf, buf + 2, 24));
|
|
strcpy(buf, "abcdefghijklmnopqrstuvwxyz");
|
|
ASSERT_STREQ("cdefghijklmnopqrstuvwxyzyz", memcpy(buf, buf + 2, 24));
|
|
}
|
|
|
|
TEST(memmove, overlappingForwards_avoidsRunLengthDecodeBehavior) {
|
|
volatile char buf[32];
|
|
strcpy(buf, "abc");
|
|
MoveMemory(buf + 1, buf, 2);
|
|
ASSERT_STREQ("aaa", buf);
|
|
strcpy(buf, "abc");
|
|
(memmove)(buf + 1, buf, 2);
|
|
ASSERT_STREQ("aab", buf);
|
|
strcpy(buf, "abcdefghijklmnopqrstuvwxyz");
|
|
MoveMemory(buf + 2, buf, 24);
|
|
ASSERT_STREQ("ababababababababababababab", buf);
|
|
strcpy(buf, "abcdefghijklmnopqrstuvwxyz");
|
|
memmove(buf + 2, buf, 24);
|
|
ASSERT_STREQ("ababcdefghijklmnopqrstuvwx", buf);
|
|
}
|