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tar et al: die if bb_copyfd_size copies less than asked for.

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(we have bb_copyfd_exact_size now for that kind of usage)
This commit is contained in:
Denis Vlasenko
2006-12-22 00:21:07 +00:00
parent 0a8a774179
commit 714701c890
13 changed files with 84 additions and 65 deletions
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32
libbb/copyfd.c
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@@ -39,7 +39,7 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
rd = safe_read(src_fd, buffer, size > BUFSIZ ? BUFSIZ : size);
if (!rd) { /* eof - all done. */
if (!rd) { /* eof - all done */
status = 0;
break;
}
@@ -56,22 +56,31 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
}
}
total += rd;
if (status < 0) {
if (status < 0) { /* if we aren't copying till EOF... */
size -= rd;
if (!size) {
status = 0;
/* 'size' bytes copied - all done */
status = 0;
break;
}
}
}
out:
out:
RELEASE_CONFIG_BUFFER(buffer);
return status ? -1 : total;
}
#if 0
void complain_copyfd_and_die(off_t sz)
{
if (sz != -1)
bb_error_msg_and_die("short read");
/* if sz == -1, bb_copyfd_XX already complained */
exit(xfunc_error_retval);
}
#endif
off_t bb_copyfd_size(int fd1, int fd2, off_t size)
{
if (size) {
@@ -80,6 +89,17 @@ off_t bb_copyfd_size(int fd1, int fd2, off_t size)
return 0;
}
void bb_copyfd_exact_size(int fd1, int fd2, off_t size)
{
off_t sz = bb_copyfd_size(fd1, fd2, size);
if (sz == size)
return;
if (sz != -1)
bb_error_msg_and_die("short read");
/* if sz == -1, bb_copyfd_XX already complained */
exit(xfunc_error_retval);
}
off_t bb_copyfd_eof(int fd1, int fd2)
{
return bb_full_fd_action(fd1, fd2, 0);