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