add stmac read mac form eeprom

hc

2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/tools/lib/string.c
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@@ -17,6 +17,7 @@
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 #include <string.h>
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 #include <errno.h>
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 #include <linux/string.h>
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+#include <linux/ctype.h>
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 #include <linux/compiler.h>
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 /**
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@@ -113,3 +114,115 @@
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 #ifdef __clang__
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 #pragma clang diagnostic pop
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 #endif
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+
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+/**
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+ * skip_spaces - Removes leading whitespace from @str.
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+ * @str: The string to be stripped.
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+ *
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+ * Returns a pointer to the first non-whitespace character in @str.
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+ */
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+char *skip_spaces(const char *str)
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+{
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+	while (isspace(*str))
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+		++str;
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+	return (char *)str;
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+}
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+
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+/**
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+ * strim - Removes leading and trailing whitespace from @s.
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+ * @s: The string to be stripped.
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+ *
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+ * Note that the first trailing whitespace is replaced with a %NUL-terminator
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+ * in the given string @s. Returns a pointer to the first non-whitespace
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+ * character in @s.
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+ */
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+char *strim(char *s)
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+{
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+	size_t size;
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+	char *end;
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+
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+	size = strlen(s);
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+	if (!size)
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+		return s;
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+
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+	end = s + size - 1;
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+	while (end >= s && isspace(*end))
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+		end--;
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+	*(end + 1) = '\0';
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+
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+	return skip_spaces(s);
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+}
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+
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+/**
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+ * strreplace - Replace all occurrences of character in string.
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+ * @s: The string to operate on.
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+ * @old: The character being replaced.
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+ * @new: The character @old is replaced with.
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+ *
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+ * Returns pointer to the nul byte at the end of @s.
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+ */
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+char *strreplace(char *s, char old, char new)
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+{
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+	for (; *s; ++s)
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+		if (*s == old)
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+			*s = new;
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+	return s;
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+}
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+
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+static void *check_bytes8(const u8 *start, u8 value, unsigned int bytes)
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+{
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+	while (bytes) {
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+		if (*start != value)
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+			return (void *)start;
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+		start++;
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+		bytes--;
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+	}
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+	return NULL;
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+}
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+
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+/**
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+ * memchr_inv - Find an unmatching character in an area of memory.
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+ * @start: The memory area
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+ * @c: Find a character other than c
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+ * @bytes: The size of the area.
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+ *
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+ * returns the address of the first character other than @c, or %NULL
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+ * if the whole buffer contains just @c.
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+ */
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+void *memchr_inv(const void *start, int c, size_t bytes)
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+{
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+	u8 value = c;
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+	u64 value64;
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+	unsigned int words, prefix;
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+
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+	if (bytes <= 16)
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+		return check_bytes8(start, value, bytes);
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+
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+	value64 = value;
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+	value64 |= value64 << 8;
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+	value64 |= value64 << 16;
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+	value64 |= value64 << 32;
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+
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+	prefix = (unsigned long)start % 8;
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+	if (prefix) {
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+		u8 *r;
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+
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+		prefix = 8 - prefix;
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+		r = check_bytes8(start, value, prefix);
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+		if (r)
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+			return r;
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+		start += prefix;
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+		bytes -= prefix;
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+	}
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+
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+	words = bytes / 8;
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+
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+	while (words) {
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+		if (*(u64 *)start != value64)
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+			return check_bytes8(start, value, 8);
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+		start += 8;
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+		words--;
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+	}
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+
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+	return check_bytes8(start, value, bytes % 8);
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+}