mirror of
https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
119 lines
5.1 KiB
C
119 lines
5.1 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/copyfile.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filesharemode.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/struct/filetime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/consts/madv.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/time/time.h"
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static textwindows int sys_copyfile_nt(const char *src, const char *dst,
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int flags) {
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int64_t fhsrc, fhdst;
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struct NtFileTime accessed, modified;
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char16_t src16[PATH_MAX], dst16[PATH_MAX];
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if (__mkntpath(src, src16) == -1) return -1;
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if (__mkntpath(dst, dst16) == -1) return -1;
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if (CopyFile(src16, dst16, !!(flags & COPYFILE_NOCLOBBER))) {
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if (flags & COPYFILE_PRESERVE_TIMESTAMPS) {
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fhsrc = CreateFile(src16, kNtFileReadAttributes, kNtFileShareRead, NULL,
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kNtOpenExisting, kNtFileAttributeNormal, 0);
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fhdst = CreateFile(dst16, kNtFileWriteAttributes, kNtFileShareRead, NULL,
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kNtOpenExisting, kNtFileAttributeNormal, 0);
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if (fhsrc != -1 && fhdst != -1) {
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GetFileTime(fhsrc, NULL, &accessed, &modified);
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SetFileTime(fhdst, NULL, &accessed, &modified);
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}
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CloseHandle(fhsrc);
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CloseHandle(fhdst);
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}
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return 0;
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} else {
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return __winerr();
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}
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}
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static int sys_copyfile(const char *src, const char *dst, int flags) {
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struct stat st;
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size_t remaining;
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ssize_t transferred;
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struct timespec amtime[2];
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int64_t inoffset, outoffset;
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int rc, srcfd, dstfd, oflags, omode;
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rc = -1;
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if ((srcfd = openat(AT_FDCWD, src, O_RDONLY, 0)) != -1) {
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if (fstat(srcfd, &st) != -1) {
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omode = st.st_mode & 0777;
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oflags = O_WRONLY | O_CREAT;
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if (flags & COPYFILE_NOCLOBBER) oflags |= O_EXCL;
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if ((dstfd = openat(AT_FDCWD, dst, oflags, omode)) != -1) {
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remaining = st.st_size;
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ftruncate(dstfd, remaining);
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inoffset = 0;
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outoffset = 0;
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while (remaining &&
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(transferred = copy_file_range(
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srcfd, &inoffset, dstfd, &outoffset, remaining, 0)) != -1) {
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remaining -= transferred;
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}
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if (!remaining) {
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rc = 0;
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if (flags & COPYFILE_PRESERVE_TIMESTAMPS) {
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amtime[0] = st.st_atim;
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amtime[1] = st.st_mtim;
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utimensat(dstfd, NULL, amtime, 0);
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}
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}
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rc |= close(dstfd);
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}
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}
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rc |= close(srcfd);
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}
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return rc;
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}
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/**
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* Copies file.
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*
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* This implementation goes 2x faster than the `cp` command that comes
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* included with most systems since we use the newer copy_file_range()
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* system call rather than sendfile().
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*
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* @param flags may have COPYFILE_PRESERVE_TIMESTAMPS, COPYFILE_NOCLOBBER
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* @return 0 on success, or -1 w/ errno
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*/
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int _copyfile(const char *src, const char *dst, int flags) {
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if (!IsWindows() || _startswith(src, "/zip/") || _startswith(dst, "/zip/")) {
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return sys_copyfile(src, dst, flags);
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} else {
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return sys_copyfile_nt(src, dst, flags);
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}
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}
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