lib: add libc-functions.c, with common functions for bare archs

This file is meant to share libc functions among non-libc-using architectures. In this commit it still exports the pp_* version, which are removed later in this patch-set. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

lib: add libc-functions.c, with common functions for bare archs
This file is meant to share libc functions among non-libc-using architectures. In this commit it still exports the pp_* version, which are removed later in this patch-set. Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
130909aa · Alessandro Rubini · 43adf9c4 · 130909aa
Commit 130909aa authored Feb 24, 2013 by Alessandro Rubini
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libc-functions.c lib/libc-functions.c +69 -0

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--- a/lib/libc-functions.c
+++ b/lib/libc-functions.c
+/*
+ * Alessandro Rubini for CERN, 2011 -- GPL 2 or later (it includes u-boot code)
+ * (FIXME: turn to LGPL by using uclibc or equivalent -- avoid rewriting :)
+ */
+#include <ppsi/lib.h>
+
+int strnlen(const char *s, int maxlen)
+{
+	int len = 0;
+	while (*(s++))
+		len++;
+	return len;
+}
+
+void *memcpy(void *dest, const void *src, int count)
+{
+	/* from u-boot-1.1.2 */
+	char *tmp = (char *) dest, *s = (char *) src;
+
+	while (count--)
+		*tmp++ = *s++;
+
+	return dest;
+}
+
+int memcmp(const void *cs, const void *ct, int count)
+{
+	/* from u-boot-1.1.2 */
+	const unsigned char *su1, *su2;
+	int res = 0;
+
+	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
+		if ((res = *su1 - *su2) != 0)
+			break;
+	return res;
+}
+
+void *memset(void *s, int c, int count)
+{
+	/* from u-boot-1.1.2 */
+	char *xs = (char *) s;
+
+	while (count--)
+		*xs++ = c;
+
+	return s;
+}
+
+char *strcpy(char *dest, const char *src)
+{
+	/* from u-boot-1.1.2 */
+	char *tmp = dest;
+
+	while ((*dest++ = *src++) != '\0')
+		/* nothing */;
+	return tmp;
+}
+
+/* As a first step in removing pp_memset etc, provide aliases */
+int pp_strnlen(const char *s, int maxlen)
+	__attribute__((alias("strnlen")));
+extern char *pp_strcpy(char *dest, const char *src)
+	__attribute__((alias("strcpy")));
+extern void *pp_memcpy(void *d, const void *s, int count)
+	__attribute__((alias("memcpy")));
+extern int pp_memcmp(const void *s1, const void *s2, int count)
+	__attribute__((alias("memcmp")));
+extern void *pp_memset(void *s, int c, int count)
+	__attribute__((alias("memset")));