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-rw-r--r--libbb/printable.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/libbb/printable.c b/libbb/printable.c
new file mode 100644
index 000000000..2420a91f0
--- /dev/null
+++ b/libbb/printable.c
@@ -0,0 +1,34 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2007 Denis Vlasenko
+ *
+ * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+void fputc_printable(int ch, FILE *file)
+{
+ if ((ch & (0x80 + PRINTABLE_META)) == (0x80 + PRINTABLE_META)) {
+ fputs("M-", file);
+ ch &= 0x7f;
+ }
+ ch = (unsigned char) ch;
+ if (ch == 0x9b) {
+ /* VT100's CSI, aka Meta-ESC, is not printable on vt-100 */
+ ch = '{';
+ goto print_caret;
+ }
+ if (ch < ' ') {
+ ch += '@';
+ goto print_caret;
+ }
+ if (ch == 0x7f) {
+ ch = '?';
+ print_caret:
+ fputc('^', file);
+ }
+ fputc(ch, file);
+}