Synch with trunk: miscellaneous changes, mostly cleanup,

code styling, comments. No object-code changes.

Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/libc/string/i386/strchrnul.c b/libc/string/i386/strchrnul.c
new file mode 100644
index 000000000..c4da2b587
--- /dev/null
+++ b/libc/string/i386/strchrnul.c
@@ -0,0 +1,47 @@
+/*
+ * Adapted from strchr.c code
+ *
+ * Copyright (C) 2008 Denys Vlasenko <vda.linux@googlemail.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <string.h>
+
+#undef strchrnul
+//#define strchrnul TESTING
+char *strchrnul(const char *s, int c)
+{
+	int esi;
+	char *eax;
+	__asm__ __volatile__(
+		"	movb	%%al, %%ah\n"
+		"1:	lodsb\n"
+		"	cmpb	%%ah, %%al\n"
+		"	je	2f\n"
+		"	testb	%%al, %%al\n"
+		"	jnz	1b\n"
+		/* with this, we'd get strchr(): */
+		/* "	movl	$1, %%esi\n" */
+		"2:	leal	-1(%%esi), %%eax\n"
+		: "=a" (eax), "=&S" (esi)
+		: "0" (c), "1" (s)
+		/* no clobbers */
+	);
+	return eax;
+}
+#ifndef strchrnul
+libc_hidden_def(strchrnul)
+#else
+/* Uncomment TESTING, gcc -D_GNU_SOURCE -m32 -Os strchrnul.c -o strchrnul
+ * and run ./strchrnul
+ */
+int main()
+{
+	static const char str[] = "abc.def";
+	printf((char*)strchrnul(str, '.') - str == 3 ? "ok\n" : "BAD!\n");
+	printf((char*)strchrnul(str, '*') - str == 7 ? "ok\n" : "BAD!\n");
+	printf((char*)strchrnul(str,   0) - str == 7 ? "ok\n" : "BAD!\n");
+	printf((char*)strchrnul(str+3, '.') - str == 3 ? "ok\n" : "BAD!\n");
+}
+#endif