copy.c 1.31 KB
Newer Older
1 2 3 4 5 6
#include "cache.h"

int copy_fd(int ifd, int ofd)
{
	while (1) {
		char buffer[8192];
7
		ssize_t len = xread(ifd, buffer, sizeof(buffer));
8 9
		if (!len)
			break;
10 11
		if (len < 0)
			return COPY_READ_ERROR;
12
		if (write_in_full(ofd, buffer, len) < 0)
13
			return COPY_WRITE_ERROR;
14 15 16
	}
	return 0;
}
17

18 19 20 21 22 23 24 25 26 27 28 29 30
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;
}

31 32 33 34 35 36 37 38 39 40 41 42
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);
43 44
	switch (status) {
	case COPY_READ_ERROR:
Duy Nguyen's avatar
Duy Nguyen committed
45
		error_errno("copy-fd: read returned");
46 47
		break;
	case COPY_WRITE_ERROR:
Duy Nguyen's avatar
Duy Nguyen committed
48
		error_errno("copy-fd: write returned");
49 50
		break;
	}
51
	close(fdi);
52
	if (close(fdo) != 0)
Duy Nguyen's avatar
Duy Nguyen committed
53
		return error_errno("%s: close error", dst);
54 55 56 57 58 59

	if (!status && adjust_shared_perm(dst))
		return -1;

	return status;
}
60 61 62 63 64 65 66 67

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;
}