Initial support for running CBFS payloads.

Add boot menu option for CBFS payloads.
Rework "override" system so that it is done per BEV.
Add file prefix scanning code to CBFS.
Add CBFS payload launching support.

1 files changed, 26 insertions, 1 deletions

diff --git a/src/util.c b/src/util.c
index 2b46ea2..df0e993 100644
--- a/src/util.c
+++ b/src/util.c
@@ -117,9 +117,34 @@ checksum(void *buf, u32 len)
     return checksum_far(GET_SEG(SS), buf, len);
 }
 
+size_t
+strlen(const char *s)
+{
+    if (__builtin_constant_p(s))
+        return __builtin_strlen(s);
+    const char *p = s;
+    while (*p)
+        p++;
+    return p-s;
+}
+
+// Compare two areas of memory.
+int
+memeq(const void *s1, const void *s2, size_t n)
+{
+    while (n) {
+        if (*(u8*)s1 != *(u8*)s2)
+            return 0;
+        s1++;
+        s2++;
+        n--;
+    }
+    return 1;
+}
+
 // Compare two strings.
 int
-streq(char *s1, char *s2)
+streq(const char *s1, const char *s2)
 {
     for (;;) {
         if (*s1 != *s2)