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path: root/i/pc104/initrd/conf/busybox/libbb/copyfd.c
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Diffstat (limited to 'i/pc104/initrd/conf/busybox/libbb/copyfd.c')
-rw-r--r--i/pc104/initrd/conf/busybox/libbb/copyfd.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/libbb/copyfd.c b/i/pc104/initrd/conf/busybox/libbb/copyfd.c
new file mode 100644
index 0000000..0d0ec22
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/libbb/copyfd.c
@@ -0,0 +1,106 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "libbb.h"
+
+
+#if BUFSIZ < 4096
+#undef BUFSIZ
+#define BUFSIZ 4096
+#endif
+
+
+static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
+{
+ int status = -1;
+ off_t total = 0;
+ RESERVE_CONFIG_BUFFER(buffer, BUFSIZ);
+
+ if (src_fd < 0) goto out;
+
+ if (!size) {
+ size = BUFSIZ;
+ status = 1; /* copy until eof */
+ }
+
+ while (1) {
+ ssize_t rd;
+
+ rd = safe_read(src_fd, buffer, size > BUFSIZ ? BUFSIZ : size);
+
+ if (!rd) { /* eof - all done */
+ status = 0;
+ break;
+ }
+ if (rd < 0) {
+ bb_perror_msg(bb_msg_read_error);
+ break;
+ }
+ /* dst_fd == -1 is a fake, else... */
+ if (dst_fd >= 0) {
+ ssize_t wr = full_write(dst_fd, buffer, rd);
+ if (wr < rd) {
+ bb_perror_msg(bb_msg_write_error);
+ break;
+ }
+ }
+ total += rd;
+ if (status < 0) { /* if we aren't copying till EOF... */
+ size -= rd;
+ if (!size) {
+ /* 'size' bytes copied - all done */
+ status = 0;
+ break;
+ }
+ }
+ }
+ 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) {
+ return bb_full_fd_action(fd1, fd2, 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);
+}