From 5fcc71581abdf8839d10786d7ac437cc5b0bf4c5 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Sat, 18 Oct 2014 17:14:12 -0500
Subject: Factor out printf-style escape parsing logic from echo.c.

---
 lib/lib.c | 8 ++++++++
 lib/lib.h | 1 +
 2 files changed, 9 insertions(+)

(limited to 'lib')

diff --git a/lib/lib.c b/lib/lib.c
index 19d28d2b..dc2de121 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -283,6 +283,14 @@ int stridx(char *haystack, char needle)
   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)
 {
diff --git a/lib/lib.h b/lib/lib.h
index 887c1d57..49b02bb5 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -152,6 +152,7 @@ long atolx(char *c);
 long atolx_range(char *numstr, long low, long high);
 int numlen(long l);
 int stridx(char *haystack, char needle);
+int unescape(char c);
 int strstart(char **a, char *b);
 off_t fdlength(int fd);
 void loopfiles_rw(char **argv, int flags, int permissions, int failok,
-- 
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