[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/strncpy.c b/ap/build/uClibc/libc/string/i386/strncpy.c
new file mode 100644
index 0000000..99d104b
--- /dev/null
+++ b/ap/build/uClibc/libc/string/i386/strncpy.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 strncpy
+/*#define strncpy TESTING*/
+char *strncpy(char * dest, const char * src, size_t count)
+{
+ int esi, edi, ecx, eax;
+ __asm__ __volatile__(
+ "1: subl $1, %%ecx\n" /* not dec! it doesnt set CF */
+ " jc 2f\n"
+ " lodsb\n"
+ " stosb\n"
+ " testb %%al, %%al\n"
+ " jnz 1b\n"
+ " rep; stosb\n"
+ "2:\n"
+ : "=&S" (esi), "=&D" (edi), "=&c" (ecx), "=&a" (eax)
+ : "0" (src), "1" (dest), "2" (count)
+ : "memory"
+ );
+ return dest;
+}
+#ifndef strncpy
+libc_hidden_def(strncpy)
+#else
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os strncpy.c -o strncpy
+ * and run ./strncpy
+ */
+int main()
+{
+ static char str[99];
+
+ str[3] = '*'; str[4] = 0; strncpy(str, "abc", 3);
+ printf(strcmp(str, "abc*") == 0 ? "ok\n" : "BAD!\n");
+
+ str[4] = '*'; str[5] = '+'; strncpy(str, "abc", 5);
+ printf(strcmp(str, "abc") == 0 && str[4] == 0 && str[5] == '+' ?
+ "ok\n" : "BAD!\n");
+ strncpy(str, "def", 0); /* should do nothing */
+ printf(strcmp(str, "abc") == 0 && str[4] == 0 && str[5] == '+' ?
+ "ok\n" : "BAD!\n");
+}
+#endif