copy.c 1.55 KB
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#include "cache.h"

int copy_fd(int ifd, int ofd)
{
	while (1) {
		char buffer[8192];
		char *buf = buffer;
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		ssize_t len = xread(ifd, buffer, sizeof(buffer));
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		if (!len)
			break;
		if (len < 0) {
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			int read_error = errno;
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			close(ifd);
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			return error("copy-fd: read returned %s",
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				     strerror(read_error));
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		}
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		while (len) {
			int written = xwrite(ofd, buf, len);
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			if (written > 0) {
				buf += written;
				len -= written;
			}
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			else if (!written) {
				close(ifd);
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				return error("copy-fd: write returned 0");
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			} else {
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				int write_error = errno;
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				close(ifd);
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				return error("copy-fd: write returned %s",
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					     strerror(write_error));
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			}
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		}
	}
	close(ifd);
	return 0;
}
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static int copy_times(const char *dst, const char *src)
{
	struct stat st;
	struct utimbuf times;
	if (stat(src, &st) < 0)
		return -1;
	times.actime = st.st_atime;
	times.modtime = st.st_mtime;
	if (utime(dst, &times) < 0)
		return -1;
	return 0;
}

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int copy_file(const char *dst, const char *src, int mode)
{
	int fdi, fdo, status;

	mode = (mode & 0111) ? 0777 : 0666;
	if ((fdi = open(src, O_RDONLY)) < 0)
		return fdi;
	if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
		close(fdi);
		return fdo;
	}
	status = copy_fd(fdi, fdo);
	if (close(fdo) != 0)
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		return error("%s: close error: %s", dst, strerror(errno));
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	if (!status && adjust_shared_perm(dst))
		return -1;

	return status;
}
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int copy_file_with_time(const char *dst, const char *src, int mode)
{
	int status = copy_file(dst, src, mode);
	if (!status)
		return copy_times(dst, src);
	return status;
}