zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/build/uClibc/libc/string/i386/memchr.c b/ap/build/uClibc/libc/string/i386/memchr.c
new file mode 100644
index 0000000..1960f6b
--- /dev/null
+++ b/ap/build/uClibc/libc/string/i386/memchr.c
@@ -0,0 +1,75 @@
+/*
+ * This string-include defines all string functions as inline
+ * functions. Use gcc. It also assumes ds=es=data space, this should be
+ * normal. Most of the string-functions are rather heavily hand-optimized,
+ * see especially strtok,strstr,str[c]spn. They should work, but are not
+ * very easy to understand. Everything is done entirely within the register
+ * set, making the functions fast and clean. String instructions have been
+ * used through-out, making for "slightly" unclear code :-)
+ *
+ * NO Copyright (C) 1991, 1992 Linus Torvalds,
+ * consider these trivial functions to be PD.
+ */
+
+/*
+ * Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ * Modified for uClibc by Erik Andersen <andersen@codepoet.org>
+ * These make no attempt to use nifty things like mmx/3dnow/etc.
+ * These are not inline, and will therefore not be as fast as
+ * modifying the headers to use inlines (and cannot therefore
+ * do tricky things when dealing with const memory). But they
+ * should (I hope!) be faster than their generic equivalents....
+ *
+ * More importantly, these should provide a good example for
+ * others to follow when adding arch specific optimizations.
+ * -Erik
+ */
+
+#include <string.h>
+
+#undef memchr
+/*#define memchr TESTING*/
+void *memchr(const void *s, int c, size_t count)
+{
+ void *edi;
+ int ecx;
+ __asm__ __volatile__(
+ " jecxz 1f\n"
+ " repne; scasb\n"
+ " leal -1(%%edi), %%edi\n"
+ " je 2f\n"
+ "1:\n"
+ " xorl %%edi, %%edi\n" /* NULL */
+ "2:\n"
+ : "=&D" (edi), "=&c" (ecx)
+ : "a" (c), "0" (s), "1" (count)
+ /* : no clobbers */
+ );
+ return edi;
+}
+#ifndef memchr
+libc_hidden_def(memchr)
+#else
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os memchr.c -o memchr
+ * and run ./memchr
+ */
+int main()
+{
+ static const char str[] = "abc.def";
+ printf((char*)memchr(str, '.',-2) - str == 3 ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.',-1) - str == 3 ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 0) == NULL ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 1) == NULL ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 2) == NULL ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 3) == NULL ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 4) - str == 3 ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str, '.', 5) - str == 3 ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str+3, '.', 0) == NULL ? "ok\n" : "BAD!\n");
+ printf((char*)memchr(str+3, '.', 5) - str == 3 ? "ok\n" : "BAD!\n");
+}
+#endif