[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/strncat.c b/ap/build/uClibc/libc/string/i386/strncat.c
new file mode 100644
index 0000000..12f0a30
--- /dev/null
+++ b/ap/build/uClibc/libc/string/i386/strncat.c
@@ -0,0 +1,86 @@
+/*
+ * 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 strncat
+/*#define strncat TESTING*/
+char *strncat(char * dest, const char * src, size_t count)
+{
+ int esi, edi, eax, ecx, edx;
+ __asm__ __volatile__(
+ " xorl %%eax, %%eax\n"
+ " incl %%edx\n"
+ " pushl %%edi\n" /* save dest */
+ " repne; scasb\n"
+ " decl %%edi\n" /* edi => NUL in dest */
+ /* count-- */
+ "1: decl %%edx\n"
+ /* if count reached 0, store NUL and bail out */
+ " movl %%edx, %%eax\n"
+ " jz 2f\n"
+ /* else copy a char */
+ " lodsb\n"
+ "2: stosb\n"
+ " testb %%al, %%al\n"
+ " jnz 1b\n"
+ /* end of loop */
+ " popl %%eax\n" /* restore dest into eax */
+ : "=&S" (esi), "=&D" (edi), "=&a" (eax), "=&c" (ecx), "=&d" (edx)
+ : "0" (src), "1" (dest), "3" (0xffffffff), "4" (count)
+ : "memory"
+ );
+ return (char *)eax;
+}
+#ifndef strncat
+libc_hidden_def(strncat)
+#else
+/* Uncomment TESTING, gcc -m32 -Os strncat.c -o strncat
+ * and run ./strncat
+ */
+int main()
+{
+ char buf[99];
+
+ strcpy(buf, "abc"); buf[4] = '*'; strncat(buf, "def", 0);
+ printf(strcmp(buf, "abc") == 0 && buf[4] == '*' ? "ok\n" : "BAD!\n");
+
+ strcpy(buf, "abc"); buf[6] = 1; buf[7] = '*'; strncat(buf, "def", 50);
+ printf(strcmp(buf, "abcdef") == 0 && buf[7] == '*' ? "ok\n" : "BAD!\n");
+
+ strcpy(buf, "abc"); buf[6] = 1; buf[7] = '*'; strncat(buf, "def", -1);
+ printf(strcmp(buf, "abcdef") == 0 && buf[7] == '*' ? "ok\n" : "BAD!\n");
+
+ strcpy(buf, "abc"); buf[6] = 1; buf[7] = '*'; strncat(buf, "def123", 3);
+ printf(strcmp(buf, "abcdef") == 0 && buf[7] == '*' ? "ok\n" : "BAD!\n");
+}
+#endif