libpayload: The initial chunk of code writen by AMD

This is the initial chunk of code written by me and copyrighted
by AMD.  Includes everything but a few files that we pulled from
outside sources.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3170 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

payloads/libpayload/libc/string.c

@@ -0,0 +1,195 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2007 Uwe Hermann <uwe@hermann-uwe.de>
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <arch/types.h>
+
+/**
+ * Calculate the length of a fixed-size string.
+ *
+ * @param str The input string.
+ * @param maxlen Return at most maxlen characters as length of the string.
+ * @return The length of the string, not including the final NUL character.
+ * 	   The maximum length returned is maxlen.
+ */
+size_t strnlen(const char *str, size_t maxlen)
+{
+	size_t len = 0;
+
+	/* NULL and empty strings have length 0. */
+	if (!str)
+		return 0;
+
+	/* Loop until we find a NUL character, or maxlen is reached. */
+	while ((*str++ != '\0') && (len < maxlen))
+		len++;
+
+	return len;
+}
+
+/**
+ * Calculate the length of a string.
+ *
+ * @param str The input string.
+ * @return The length of the string, not including the final NUL character.
+ */
+size_t strlen(const char *str)
+{
+	size_t len = 0;
+
+	/* NULL and empty strings have length 0. */
+	if (!str)
+		return 0;
+
+	/* Loop until we find a NUL character. */
+	while (*str++ != '\0')
+		len++;
+
+	return len;
+}
+
+/**
+ * Compare two strings.
+ *
+ * @param s1 The first string.
+ * @param s2 The second string.
+ * @return Returns a value less than zero, if s1 is shorter than s2. Returns
+ * 	   zero, if s1 equals s2. Returns a value greater than zero, if
+ * 	   s1 is longer than s2.
+ */
+int strcmp(const char *s1, const char *s2)
+{
+	char c1, c2;
+
+	/* Set c1 == c2, so that we can enter the while loop. */
+	c1 = 0;
+	c2 = 0;
+
+	/* Compare characters until they differ, or one of the strings ends. */
+	while (c1 == c2) {
+		/* Read the next character from each string. */
+		c1 = *s1++;
+		c2 = *s2++;
+
+		/* Return something negative (if s1 is shorter than s2), or
+		   zero (if s1 equals s2). */
+		if (c1 == '\0')
+			return c1 - c2;
+	}
+
+	/* Return someting positive (if s1 is longer than s2), or zero (if s1
+	   and s2 are equal). */
+	return c1 - c2;
+}
+
+/**
+ * Compare two strings with fixed length.
+ *
+ * @param s1 The first string.
+ * @param s2 The second string.
+ * @param maxlen Return at most maxlen characters as length of the string.
+ * @return A non-zero value if s1 and s2 differ, or zero if s1 equals s2.
+ */
+int strncmp(const char *s1, const char *s2, int maxlen)
+{
+	int i;
+
+	for (i = 0; i < maxlen; i++) {
+		if (s1[i] != s2[i])
+			return s1[i] - s2[i];
+	}
+
+	return 0;
+}
+
+char *strncpy(char *d, const char *s, int n)
+{
+	/* use +1 to get the null terminator */
+
+	int max = n > strlen(s) + 1 ? strlen(s) + 1 : n;
+	int i;
+
+	for(i = 0; i < max; i++)
+		d[i] = (char) s[i];
+
+	return d;
+}
+
+char *strncat(char *d, const char *s, int n)
+{
+	char *p = d + strlen(d);
+	int max = n > strlen(s) ? strlen(s) : n;
+	int i;
+
+	for(i = 0; i < max; i++)
+		p[i] = s[i];
+
+	p[i] = '\0';
+	return d;
+}
+
+char * strchr(const char *s, int c)
+{
+	char *p = (char *) s;
+
+	for( ; *p != 0; p++) {
+		if (*p == c)
+			return p;
+	}
+
+	return NULL;
+}
+
+
+char *strdup(const char *s)
+{
+	int n = strlen(s);
+	char *p = malloc(n);
+
+	if (p != NULL)
+		strncpy(p, s, n);
+
+	return p;
+}
+
+char *strstr(const char *h, const char *n)
+{
+	int hn = strlen(h);
+	int nn = strlen(n);
+	int i;
+
+	for(i = 0; i <= hn - nn; i++)
+		if (!strcmp(&h[i], n))
+			return (char *) &h[i];
+
+	return NULL;
+}
+
+