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copy.c

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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, &times) < 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;

}