+
+enum ConvType {
+ CT_UNIX2DOS = 1,
+ CT_DOS2UNIX
+} ConvType;
+
+/* if fn is NULL then input is stdin and output is stdout */
+static int convert(char *fn)
+{
+ FILE *in, *out;
+ int i;
+
+ if (fn != NULL) {
+ in = bb_xfopen(fn, "rw");
+ /*
+ The file is then created with mode read/write and
+ permissions 0666 for glibc 2.0.6 and earlier or
+ 0600 for glibc 2.0.7 and later.
+ */
+ snprintf(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), "%sXXXXXX", fn);
+ /*
+ sizeof bb_common_bufsiz1 is 4096, so it should be big enough to
+ hold the full path. However if the output is truncated the
+ subsequent call to mkstemp would fail.
+ */
+ if ((i = mkstemp(&bb_common_bufsiz1[0])) == -1
+ || chmod(bb_common_bufsiz1, 0600) == -1) {
+ bb_perror_nomsg_and_die();
+ }
+ out = fdopen(i, "w+");
+ if (!out) {
+ close(i);
+ remove(bb_common_bufsiz1);
+ }
+ } else {
+ in = stdin;
+ out = stdout;
+ }
+
+ while ((i = fgetc(in)) != EOF) {
+ if (i == '\r')
+ continue;
+ if (i == '\n') {
+ if (ConvType == CT_UNIX2DOS)
+ fputc('\r', out);
+ fputc('\n', out);
+ continue;
+ }
+ fputc(i, out);
+ }
+
+ if (fn != NULL) {
+ if (fclose(in) < 0 || fclose(out) < 0) {
+ bb_perror_nomsg();
+ remove(bb_common_bufsiz1);
+ return -2;
+ }
+ /* Assume they are both on the same filesystem (which
+ * should be true since we put them into the same directory
+ * so we _should_ be ok, but you never know... */
+ if (rename(bb_common_bufsiz1, fn) < 0) {
+ bb_perror_msg("cannot rename '%s' as '%s'", bb_common_bufsiz1, fn);
+ return -1;
+ }