wip compile on device

1 files changed, 30 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index c3df450..c3e4077 100644
--- a/src/main.c
+++ b/src/main.c
@@ -11,7 +11,6 @@
 #include <string.h>
 #include <stdio.h>
 
-
 #include "stage1_primitives.h"
 #include "stage0_primitives.h"
 #include "patchfinder.h"
@@ -23,6 +22,36 @@
 uint32_t DNS4_OFFSET;
 uint32_t LC_CONF_OFFSET;
 
+// https://opensource.apple.com/source/Libc/Libc-825.26/string/FreeBSD/memmem.c.auto.html
+void *
+memmem(const void *l, size_t l_len, const void *s, size_t s_len)
+{
+	register char *cur, *last;
+	const char *cl = (const char *)l;
+	const char *cs = (const char *)s;
+
+	/* we need something to compare */
+	if (l_len == 0 || s_len == 0)
+		return NULL;
+
+	/* "s" must be smaller or equal to "l" */
+	if (l_len < s_len)
+		return NULL;
+
+	/* special case where s_len == 1 */
+	if (s_len == 1)
+		return memchr(l, (int)*cs, l_len);
+
+	/* the last position where its possible to find "s" in "l" */
+	last = (char *)cl + l_len - s_len;
+
+	for (cur = (char *)cl; cur <= last; cur++)
+		if (cur[0] == cs[0] && memcmp(cur, cs, s_len) == 0)
+			return cur;
+
+	return NULL;
+}
+
 char* fuck_memory_leaks = NULL;
 
 FILE* fp = NULL;