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78 lines (71 loc) · 1.55 KB
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copy.c
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78 lines (71 loc) · 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;
ssize_t len = xread(ifd, buffer, sizeof(buffer));
if (!len)
break;
if (len < 0) {
int read_error = errno;
close(ifd);
return error("copy-fd: read returned %s",
strerror(read_error));
}
while (len) {
int written = xwrite(ofd, buf, len);
if (written > 0) {
buf += written;
len -= written;
}
else if (!written) {
close(ifd);
return error("copy-fd: write returned 0");
} else {
int write_error = errno;
close(ifd);
return error("copy-fd: write returned %s",
strerror(write_error));
}
}
}
close(ifd);
return 0;
}
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, ×) < 0)
return -1;
return 0;
}
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)
return error("%s: close error: %s", dst, strerror(errno));
if (!status && adjust_shared_perm(dst))
return -1;
return status;
}
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;
}