[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/build/uClibc/libc/string/i386/strnlen.c b/ap/build/uClibc/libc/string/i386/strnlen.c
new file mode 100644
index 0000000..f58f698
--- /dev/null
+++ b/ap/build/uClibc/libc/string/i386/strnlen.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>
+
+#ifdef __USE_GNU
+
+#undef strnlen
+/*#define strnlen TESTING*/
+size_t strnlen(const char *s, size_t count)
+{
+ int edx;
+ int eax;
+ __asm__ __volatile__(
+ " leal -1(%%ecx), %%eax\n"
+ "1: incl %%eax\n"
+ " decl %%edx\n"
+ " jz 3f\n"
+ " cmpb $0, (%%eax)\n"
+ " jnz 1b\n"
+ "3: subl %%ecx, %%eax"
+ : "=a" (eax), "=&d" (edx)
+ : "c" (s), "1" (count + 1)
+ );
+ return eax;
+}
+#ifndef strnlen
+libc_hidden_def(strnlen)
+#else
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os strnlen.c -o strnlen
+ * and run ./strnlen
+ */
+int main()
+{
+ printf(strnlen("abc\0def", -2) == 3 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", -1) == 3 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 0) == 0 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 1) == 1 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 2) == 2 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 3) == 3 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 4) == 3 ? "ok\n" : "BAD!\n");
+ printf(strnlen("abc\0def", 5) == 3 ? "ok\n" : "BAD!\n");
+}
+#endif
+
+#endif