66 lines
2.9 KiB
C
66 lines
2.9 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/calls.h"
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#include "libc/errno.h"
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#include "libc/str/str.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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/**
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* Writes data to file.
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*
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* @param size can be -1 to strlen(data)
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* @return if failed, -1 w/ errno
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* @note this is uninterruptible
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*/
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int xbarf(const char *path, const void *data, size_t size) {
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char *p;
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ssize_t rc;
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int fd, res;
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size_t i, wrote;
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res = 0;
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p = data;
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if (size == -1) size = strlen(p);
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if ((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) != -1) {
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if (ftruncate(fd, size) != -1) {
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if (size > 2 * 1024 * 1024) {
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fadvise(fd, 0, size, MADV_SEQUENTIAL);
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}
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for (i = 0; i < size; i += wrote) {
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TryAgain:
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if ((rc = pwrite(fd, p + i, size - i, i)) != -1) {
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wrote = rc;
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} else if (errno == EINTR) {
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goto TryAgain;
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} else {
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res = -1;
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break;
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}
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}
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} else {
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res = -1;
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}
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close(fd);
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} else {
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res = -1;
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}
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return res;
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}
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