3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
111 lines
4.7 KiB
C
111 lines
4.7 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/calls/hefty/copyfile.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/stat.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/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 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 copyfile$sysv(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$sysv(AT_FDCWD, src, O_RDONLY, 0)) != -1) {
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if (fstat$sysv(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$sysv(AT_FDCWD, dst, oflags, omode)) != -1) {
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remaining = st.st_size;
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ftruncate(dstfd, remaining);
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inoffset = 0;
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outoffset = 0;
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while (remaining &&
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(transferred = copy_file_range(
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srcfd, &inoffset, dstfd, &outoffset, remaining, 0)) != -1) {
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remaining -= transferred;
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}
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if (!remaining) {
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rc = 0;
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if (flags & COPYFILE_PRESERVE_TIMESTAMPS) {
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amtime[0] = st.st_atim;
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amtime[1] = st.st_mtim;
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utimensat$sysv(dstfd, NULL, amtime, 0);
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}
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}
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rc |= close$sysv(dstfd);
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}
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}
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rc |= close$sysv(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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int copyfile(const char *src, const char *dst, int flags) {
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if (!IsWindows()) {
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return copyfile$sysv(src, dst, flags);
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} else {
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return copyfile$nt(src, dst, flags);
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}
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}
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