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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/calls/copyfile.c Normal file
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/*-*- 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/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/calls/struct/stat.h"
#include "libc/dce.h"
#include "libc/nt/files.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/madv.h"
#include "libc/sysv/consts/o.h"
int copyfile(const char *frompath, const char *topath, bool dontoverwrite) {
if (IsWindows()) {
char16_t frompath16[PATH_MAX], topath16[PATH_MAX];
if (mkntpath(frompath, frompath16) == -1) return -1;
if (mkntpath(topath, topath16) == -1) return -1;
if (CopyFile(frompath16, topath16, dontoverwrite)) {
return 0;
} else {
return winerr();
}
} else {
struct stat st;
ssize_t transferred;
int rc, fromfd, tofd;
int64_t inoffset, outoffset;
rc = -1;
if ((fromfd = openat$sysv(AT_FDCWD, frompath, O_RDONLY, 0)) != -1) {
if (fstat$sysv(fromfd, &st) != -1 &&
(tofd = openat$sysv(AT_FDCWD, topath,
O_WRONLY | O_CREAT | (dontoverwrite ? O_EXCL : 0),
st.st_mode & 0777)) != -1) {
inoffset = 0;
outoffset = 0;
while (st.st_size && (transferred = copy_file_range(
fromfd, &inoffset, tofd, &outoffset,
st.st_size, 0)) != -1) {
st.st_size -= transferred;
}
if (!st.st_size) rc = 0;
rc |= close$sysv(tofd);
}
rc |= close$sysv(fromfd);
}
return rc;
}
}