echo: fix echo -e -n "msg\n\0"
(by "Pinedo, David" <david.pinedo AT hp.com>)
diff --git a/coreutils/echo.c b/coreutils/echo.c
index 6e25db6..cc9b9e6 100644
--- a/coreutils/echo.c
+++ b/coreutils/echo.c
@@ -108,15 +108,19 @@
}
#if !ENABLE_FEATURE_FANCY_ECHO
/* SUSv3 specifies that octal escapes must begin with '0'. */
- if ( (((unsigned char)*arg) - '1') >= 7)
+ if ( ((int)(unsigned char)(*arg) - '0') >= 8) /* '8' or bigger */
#endif
{
/* Since SUSv3 mandates a first digit of 0, 4-digit octals
* of the form \0### are accepted. */
- if (*arg == '0' && ((unsigned char)(arg[1]) - '0') < 8) {
- arg++;
+ if (*arg == '0') {
+ /* NB: don't turn "...\0" into "...\" */
+ if (arg[1] && ((unsigned char)(arg[1]) - '0') < 8) {
+ arg++;
+ }
}
- /* bb_process_escape_sequence can handle nul correctly */
+ /* bb_process_escape_sequence handles NUL correctly
+ * ("...\" case). */
c = bb_process_escape_sequence(&arg);
}
}
diff --git a/testsuite/echo/echo-prints-slash-zero b/testsuite/echo/echo-prints-slash-zero
new file mode 100644
index 0000000..d246632
--- /dev/null
+++ b/testsuite/echo/echo-prints-slash-zero
@@ -0,0 +1 @@
+test "`busybox echo -e -n 'msg\n\0' | od -t x1 | head -n 1`" = "0000000 6d 73 67 0a 00"
