[hackers] [sbase] Fix segmentation fault in tr(1) || FRIGN

[git]

commit ac29778bdc15849f4b959969b9ca780e68e48fa7
Author: FRIGN <d...@frign.de>
Date:   Sat Jan 24 23:00:34 2015 +0100

    Fix segmentation fault in tr(1)
    
    and make the parser stricter.

diff --git a/tr.c b/tr.c
index e2e6b71..7aa71e7 100644
--- a/tr.c
+++ b/tr.c
@@ -75,7 +75,7 @@ resolveescapes(Rune *r, size_t len)
 {
        size_t i, off, m, factor, q;
 
-       for (i = 0; i < len - 1; i++) {
+       for (i = 0; i < len; i++) {
                if (r[i] != '\\')
                        continue;
                off = 0;
@@ -97,7 +97,7 @@ resolveescapes(Rune *r, size_t len)
                                if (r[m] < '0' || r[m] > '7')
                                        break;
                        if (m == i + 1)
-                               continue;
+                               eprintf("tr: invalid escape sequence '\\%c'\n", 
r[i + 1]);
                        off += m - i - 1;
                        for (--m, q = 0, factor = 1; m > i; m--) {
                                q += (r[m] - '0') * factor;