commit 5fcc71581abdf8839d10786d7ac437cc5b0bf4c5
author Rob Landley <rob@landley.net> Sat Oct 18 17:14:12 2014 -0500
committer Rob Landley <rob@landley.net> Sat Oct 18 17:14:12 2014 -0500
tree 4143360f7699d4b2b6f3daecf7ae36a2c625a913
parent 01138b94e6ac9ff2d1258917f96c0c5c8c124021

Factor out printf-style escape parsing logic from echo.c.

lib/lib.c

diff --git a/lib/lib.c b/lib/lib.c
index 19d28d2..dc2de12 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -283,6 +283,14 @@
   return off-haystack;
 }
 
+int unescape(char c)
+{
+  char *from = "\\abefnrtv", *to = "\\\a\b\033\f\n\r\t\v";
+  int idx = stridx(from, c);
+
+  return (idx == -1) ? 0 : to[idx];
+}
+
 // If *a starts with b, advance *a past it and return 1, else return 0;
 int strstart(char **a, char *b)
 {