paranoia mode for strcmp

1 files changed, 16 insertions, 0 deletions

diff --git a/common.c b/common.c
index e6c2113..439540d 100644
--- a/common.c
+++ b/common.c
@@ -3,6 +3,7 @@
 #include <glcdskin/type.h>
 
 #include <vdr/plugin.h>
+#include <string.h>
 
 #if APIVERSNUM < 10503
 #include <locale.h>
@@ -141,3 +142,18 @@ GLCD::cType DurationType(int Index, const std::string &Format)
     }
     return false;
 }
+
+int ParanoiaStrcmp(const char *s1, const char *s2)
+{
+    if (! s1 || ! s2)
+        return -1;
+    
+    // s1 must be under 'our' control (and thus valid), s2 may be a string w/ unexpected content
+    size_t n = strlen(s1);
+    
+    int rv = strncmp(s1, s2, n);
+    if (rv == 0)
+        return (s2[n] == '\0') ? 0 : -1;
+    else
+        return rv;
+}