1 files changed, 605 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
new file mode 100644
index 0000000..b375b81
--- /dev/null
+++ b/lib/string.c
@@ -0,0 +1,605 @@
+/*
+ *  linux/lib/string.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+/*
+ * stupid library routines.. The optimized versions should generally be found
+ * as inline code in <asm-xx/string.h>
+ *
+ * These are buggy as well..
+ *
+ * * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
+ * -  Added strsep() which will replace strtok() soon (because strsep() is
+ *    reentrant and should be faster). Use only strsep() in new code, please.
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <malloc.h>
+
+
+#if 0 /* not used - was: #ifndef __HAVE_ARCH_STRNICMP */
+/**
+ * strnicmp - Case insensitive, length-limited string comparison
+ * @s1: One string
+ * @s2: The other string
+ * @len: the maximum number of characters to compare
+ */
+int strnicmp(const char *s1, const char *s2, size_t len)
+{
+	/* Yes, Virginia, it had better be unsigned */
+	unsigned char c1, c2;
+
+	c1 = 0;	c2 = 0;
+	if (len) {
+		do {
+			c1 = *s1; c2 = *s2;
+			s1++; s2++;
+			if (!c1)
+				break;
+			if (!c2)
+				break;
+			if (c1 == c2)
+				continue;
+			c1 = tolower(c1);
+			c2 = tolower(c2);
+			if (c1 != c2)
+				break;
+		} while (--len);
+	}
+	return (int)c1 - (int)c2;
+}
+#endif
+
+char * ___strtok;
+
+#ifndef __HAVE_ARCH_STRCPY
+/**
+ * strcpy - Copy a %NUL terminated string
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ */
+char * strcpy(char * dest,const char *src)
+{
+	char *tmp = dest;
+
+	while ((*dest++ = *src++) != '\0')
+		/* nothing */;
+	return tmp;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRNCPY
+/**
+ * strncpy - Copy a length-limited, %NUL-terminated string
+ * @dest: Where to copy the string to
+ * @src: Where to copy the string from
+ * @count: The maximum number of bytes to copy
+ *
+ * Note that unlike userspace strncpy, this does not %NUL-pad the buffer.
+ * However, the result is not %NUL-terminated if the source exceeds
+ * @count bytes.
+ */
+char * strncpy(char * dest,const char *src,size_t count)
+{
+	char *tmp = dest;
+
+	while (count-- && (*dest++ = *src++) != '\0')
+		/* nothing */;
+
+	return tmp;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRCAT
+/**
+ * strcat - Append one %NUL-terminated string to another
+ * @dest: The string to be appended to
+ * @src: The string to append to it
+ */
+char * strcat(char * dest, const char * src)
+{
+	char *tmp = dest;
+
+	while (*dest)
+		dest++;
+	while ((*dest++ = *src++) != '\0')
+		;
+
+	return tmp;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRNCAT
+/**
+ * strncat - Append a length-limited, %NUL-terminated string to another
+ * @dest: The string to be appended to
+ * @src: The string to append to it
+ * @count: The maximum numbers of bytes to copy
+ *
+ * Note that in contrast to strncpy, strncat ensures the result is
+ * terminated.
+ */
+char * strncat(char *dest, const char *src, size_t count)
+{
+	char *tmp = dest;
+
+	if (count) {
+		while (*dest)
+			dest++;
+		while ((*dest++ = *src++)) {
+			if (--count == 0) {
+				*dest = '\0';
+				break;
+			}
+		}
+	}
+
+	return tmp;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRCMP
+/**
+ * strcmp - Compare two strings
+ * @cs: One string
+ * @ct: Another string
+ */
+int strcmp(const char * cs,const char * ct)
+{
+	register signed char __res;
+
+	while (1) {
+		if ((__res = *cs - *ct++) != 0 || !*cs++)
+			break;
+	}
+
+	return __res;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRNCMP
+/**
+ * strncmp - Compare two length-limited strings
+ * @cs: One string
+ * @ct: Another string
+ * @count: The maximum number of bytes to compare
+ */
+int strncmp(const char * cs,const char * ct,size_t count)
+{
+	register signed char __res = 0;
+
+	while (count) {
+		if ((__res = *cs - *ct++) != 0 || !*cs++)
+			break;
+		count--;
+	}
+
+	return __res;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRCHR
+/**
+ * strchr - Find the first occurrence of a character in a string
+ * @s: The string to be searched
+ * @c: The character to search for
+ */
+char * strchr(const char * s, int c)
+{
+	for(; *s != (char) c; ++s)
+		if (*s == '\0')
+			return NULL;
+	return (char *) s;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRRCHR
+/**
+ * strrchr - Find the last occurrence of a character in a string
+ * @s: The string to be searched
+ * @c: The character to search for
+ */
+char * strrchr(const char * s, int c)
+{
+       const char *p = s + strlen(s);
+       do {
+	   if (*p == (char)c)
+	       return (char *)p;
+       } while (--p >= s);
+       return NULL;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRLEN
+/**
+ * strlen - Find the length of a string
+ * @s: The string to be sized
+ */
+size_t strlen(const char * s)
+{
+	const char *sc;
+
+	for (sc = s; *sc != '\0'; ++sc)
+		/* nothing */;
+	return sc - s;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRNLEN
+/**
+ * strnlen - Find the length of a length-limited string
+ * @s: The string to be sized
+ * @count: The maximum number of bytes to search
+ */
+size_t strnlen(const char * s, size_t count)
+{
+	const char *sc;
+
+	for (sc = s; count-- && *sc != '\0'; ++sc)
+		/* nothing */;
+	return sc - s;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRDUP
+char * strdup(const char *s)
+{
+	char *new;
+
+	if ((s == NULL)	||
+	    ((new = malloc (strlen(s) + 1)) == NULL) ) {
+		return NULL;
+	}
+
+	strcpy (new, s);
+	return new;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRSPN
+/**
+ * strspn - Calculate the length of the initial substring of @s which only
+ *	contain letters in @accept
+ * @s: The string to be searched
+ * @accept: The string to search for
+ */
+size_t strspn(const char *s, const char *accept)
+{
+	const char *p;
+	const char *a;
+	size_t count = 0;
+
+	for (p = s; *p != '\0'; ++p) {
+		for (a = accept; *a != '\0'; ++a) {
+			if (*p == *a)
+				break;
+		}
+		if (*a == '\0')
+			return count;
+		++count;
+	}
+
+	return count;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRPBRK
+/**
+ * strpbrk - Find the first occurrence of a set of characters
+ * @cs: The string to be searched
+ * @ct: The characters to search for
+ */
+char * strpbrk(const char * cs,const char * ct)
+{
+	const char *sc1,*sc2;
+
+	for( sc1 = cs; *sc1 != '\0'; ++sc1) {
+		for( sc2 = ct; *sc2 != '\0'; ++sc2) {
+			if (*sc1 == *sc2)
+				return (char *) sc1;
+		}
+	}
+	return NULL;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRTOK
+/**
+ * strtok - Split a string into tokens
+ * @s: The string to be searched
+ * @ct: The characters to search for
+ *
+ * WARNING: strtok is deprecated, use strsep instead.
+ */
+char * strtok(char * s,const char * ct)
+{
+	char *sbegin, *send;
+
+	sbegin  = s ? s : ___strtok;
+	if (!sbegin) {
+		return NULL;
+	}
+	sbegin += strspn(sbegin,ct);
+	if (*sbegin == '\0') {
+		___strtok = NULL;
+		return( NULL );
+	}
+	send = strpbrk( sbegin, ct);
+	if (send && *send != '\0')
+		*send++ = '\0';
+	___strtok = send;
+	return (sbegin);
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRSEP
+/**
+ * strsep - Split a string into tokens
+ * @s: The string to be searched
+ * @ct: The characters to search for
+ *
+ * strsep() updates @s to point after the token, ready for the next call.
+ *
+ * It returns empty tokens, too, behaving exactly like the libc function
+ * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
+ * Same semantics, slimmer shape. ;)
+ */
+char * strsep(char **s, const char *ct)
+{
+	char *sbegin = *s, *end;
+
+	if (sbegin == NULL)
+		return NULL;
+
+	end = strpbrk(sbegin, ct);
+	if (end)
+		*end++ = '\0';
+	*s = end;
+
+	return sbegin;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRSWAB
+/**
+ * strswab - swap adjacent even and odd bytes in %NUL-terminated string
+ * s: address of the string
+ *
+ * returns the address of the swapped string or NULL on error. If
+ * string length is odd, last byte is untouched.
+ */
+char *strswab(const char *s)
+{
+	char *p, *q;
+
+	if ((NULL == s) || ('\0' == *s)) {
+		return (NULL);
+	}
+
+	for (p=(char *)s, q=p+1; (*p != '\0') && (*q != '\0'); p+=2, q+=2) {
+		char  tmp;
+
+		tmp = *p;
+		*p  = *q;
+		*q  = tmp;
+	}
+
+	return (char *) s;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMSET
+/**
+ * memset - Fill a region of memory with the given value
+ * @s: Pointer to the start of the area.
+ * @c: The byte to fill the area with
+ * @count: The size of the area.
+ *
+ * Do not use memset() to access IO space, use memset_io() instead.
+ */
+void * memset(void * s,int c,size_t count)
+{
+	unsigned long *sl = (unsigned long *) s;
+	unsigned long cl = 0;
+	char *s8;
+	int i;
+
+	/* do it one word at a time (32 bits or 64 bits) while possible */
+	if ( ((ulong)s & (sizeof(*sl) - 1)) == 0) {
+		for (i = 0; i < sizeof(*sl); i++) {
+			cl <<= 8;
+			cl |= c & 0xff;
+		}
+		while (count >= sizeof(*sl)) {
+			*sl++ = cl;
+			count -= sizeof(*sl);
+		}
+	}
+	/* fill 8 bits at a time */
+	s8 = (char *)sl;
+	while (count--)
+		*s8++ = c;
+
+	return s;
+}
+#endif
+
+#ifndef __HAVE_ARCH_BCOPY
+/**
+ * bcopy - Copy one area of memory to another
+ * @src: Where to copy from
+ * @dest: Where to copy to
+ * @count: The size of the area.
+ *
+ * Note that this is the same as memcpy(), with the arguments reversed.
+ * memcpy() is the standard, bcopy() is a legacy BSD function.
+ *
+ * You should not use this function to access IO space, use memcpy_toio()
+ * or memcpy_fromio() instead.
+ */
+char * bcopy(const char * src, char * dest, int count)
+{
+	char *tmp = dest;
+
+	while (count--)
+		*tmp++ = *src++;
+
+	return dest;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMCPY
+/**
+ * memcpy - Copy one area of memory to another
+ * @dest: Where to copy to
+ * @src: Where to copy from
+ * @count: The size of the area.
+ *
+ * You should not use this function to access IO space, use memcpy_toio()
+ * or memcpy_fromio() instead.
+ */
+void * memcpy(void *dest, const void *src, size_t count)
+{
+	unsigned long *dl = (unsigned long *)dest, *sl = (unsigned long *)src;
+	char *d8, *s8;
+
+	/* while all data is aligned (common case), copy a word at a time */
+	if ( (((ulong)dest | (ulong)src) & (sizeof(*dl) - 1)) == 0) {
+		while (count >= sizeof(*dl)) {
+			*dl++ = *sl++;
+			count -= sizeof(*dl);
+		}
+	}
+	/* copy the reset one byte at a time */
+	d8 = (char *)dl;
+	s8 = (char *)sl;
+	while (count--)
+		*d8++ = *s8++;
+
+	return dest;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMMOVE
+/**
+ * memmove - Copy one area of memory to another
+ * @dest: Where to copy to
+ * @src: Where to copy from
+ * @count: The size of the area.
+ *
+ * Unlike memcpy(), memmove() copes with overlapping areas.
+ */
+void * memmove(void * dest,const void *src,size_t count)
+{
+	char *tmp, *s;
+
+	if (dest <= src) {
+		tmp = (char *) dest;
+		s = (char *) src;
+		while (count--)
+			*tmp++ = *s++;
+		}
+	else {
+		tmp = (char *) dest + count;
+		s = (char *) src + count;
+		while (count--)
+			*--tmp = *--s;
+		}
+
+	return dest;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMCMP
+/**
+ * memcmp - Compare two areas of memory
+ * @cs: One area of memory
+ * @ct: Another area of memory
+ * @count: The size of the area.
+ */
+int memcmp(const void * cs,const void * ct,size_t count)
+{
+	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;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMSCAN
+/**
+ * memscan - Find a character in an area of memory.
+ * @addr: The memory area
+ * @c: The byte to search for
+ * @size: The size of the area.
+ *
+ * returns the address of the first occurrence of @c, or 1 byte past
+ * the area if @c is not found
+ */
+void * memscan(void * addr, int c, size_t size)
+{
+	unsigned char * p = (unsigned char *) addr;
+
+	while (size) {
+		if (*p == c)
+			return (void *) p;
+		p++;
+		size--;
+	}
+	return (void *) p;
+}
+#endif
+
+#ifndef __HAVE_ARCH_STRSTR
+/**
+ * strstr - Find the first substring in a %NUL terminated string
+ * @s1: The string to be searched
+ * @s2: The string to search for
+ */
+char * strstr(const char * s1,const char * s2)
+{
+	int l1, l2;
+
+	l2 = strlen(s2);
+	if (!l2)
+		return (char *) s1;
+	l1 = strlen(s1);
+	while (l1 >= l2) {
+		l1--;
+		if (!memcmp(s1,s2,l2))
+			return (char *) s1;
+		s1++;
+	}
+	return NULL;
+}
+#endif
+
+#ifndef __HAVE_ARCH_MEMCHR
+/**
+ * memchr - Find a character in an area of memory.
+ * @s: The memory area
+ * @c: The byte to search for
+ * @n: The size of the area.
+ *
+ * returns the address of the first occurrence of @c, or %NULL
+ * if @c is not found
+ */
+void *memchr(const void *s, int c, size_t n)
+{
+	const unsigned char *p = s;
+	while (n-- != 0) {
+		if ((unsigned char)c == *p++) {
+			return (void *)(p-1);
+		}
+	}
+	return NULL;
+}
+
+#endif