From ebef68bf4c8e95fe6b06214c1081fab3882ce1d3 Mon Sep 17 00:00:00 2001
From: David van Moolenbroek <david@minix3.org>
Date: Mon, 24 Aug 2015 08:30:46 +0200
Subject: [PATCH] libmagic: supply own ctype macros

Due to the current linker command line ordering, parts of lib(min)c
that are used exclusively by libmagic end up not being instrumented,
which then causes problems transferring pointers such as _ctype_tab_
and _tolower_tab_.  As a temporary workaround, we redefine the macros
that use those pointers.  A better long-term solution should
eventually render this patch obsolete.

Change-Id: Ice1d125ff6fb2f65ac6dcc6cf6eec7cd6176bee1
---
 minix/llvm/static/magic/magic_eval_lib.c | 36 ++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/minix/llvm/static/magic/magic_eval_lib.c b/minix/llvm/static/magic/magic_eval_lib.c
index 9aa8d209c..0ed653830 100644
--- a/minix/llvm/static/magic/magic_eval_lib.c
+++ b/minix/llvm/static/magic/magic_eval_lib.c
@@ -12,6 +12,42 @@
 #include <math.h>
 #endif
 
+#ifdef __MINIX
+/* FIXME: due to the current linker command line ordering, parts of lib(min)c
+ * that are used exclusively by libmagic end up not being instrumented, which
+ * then causes problems transferring pointers such as _ctype_tab_ and
+ * _tolower_tab_. As a temporary workaround, we redefine the macros that use
+ * those pointers. This code is currently never triggered so it is not
+ * performance critical; obviously there are a million better ways to do this.
+ */
+#undef isalpha
+#define isalpha(c) ((unsigned)(((c) & ~0x20) - 'A') <= ('Z' - 'A'))
+#undef isupper
+#define isupper(c) ((unsigned)((c) - 'A') <= ('Z' - 'A'))
+#undef islower
+#define islower(c) ((unsigned)((c) - 'a') <= ('z' - 'a'))
+#undef isdigit
+#define isdigit(c) ((unsigned)((c) - '0') <= ('9' - '0'))
+static inline int __isxdigit(c) {
+    return isdigit(c) || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f');
+}
+#undef isxdigit
+#define isxdigit(c) (__isxdigit(c))
+static inline int __isspace(c) {
+    switch (c) {
+    case ' ': case '\t': case '\n': case '\v': case '\f': case '\r': return 1;
+    default: return 0;
+    }
+}
+#undef isspace
+#define isspace(c) (__isspace(c))
+static inline int __tolower(c) {
+    return isupper(c) ? (c | 0x20) : c;
+}
+#undef tolower
+#define tolower(c) (__tolower(c))
+#endif /* __MINIX */
+
 /* a token structure */
 struct tok {
     struct tok *next;