a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
389 lines
8.6 KiB
C
389 lines
8.6 KiB
C
/*
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* Optimized string functions
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*
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* S390 version
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* Copyright IBM Corp. 2004
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#define IN_ARCH_STRING_C 1
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#include <linux/types.h>
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#include <linux/module.h>
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/*
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* Helper functions to find the end of a string
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*/
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static inline char *__strend(const char *s)
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{
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register unsigned long r0 asm("0") = 0;
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asm volatile ("0: srst %0,%1\n"
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" jo 0b"
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: "+d" (r0), "+a" (s) : : "cc" );
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return (char *) r0;
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}
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static inline char *__strnend(const char *s, size_t n)
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{
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register unsigned long r0 asm("0") = 0;
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const char *p = s + n;
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asm volatile ("0: srst %0,%1\n"
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" jo 0b"
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: "+d" (p), "+a" (s) : "d" (r0) : "cc" );
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return (char *) p;
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}
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/**
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* strlen - Find the length of a string
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* @s: The string to be sized
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*
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* returns the length of @s
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*/
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size_t strlen(const char *s)
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{
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#if __GNUC__ < 4
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return __strend(s) - s;
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#else
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return __builtin_strlen(s);
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#endif
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}
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EXPORT_SYMBOL(strlen);
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/**
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* strnlen - Find the length of a length-limited string
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* @s: The string to be sized
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* @n: The maximum number of bytes to search
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*
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* returns the minimum of the length of @s and @n
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*/
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size_t strnlen(const char * s, size_t n)
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{
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return __strnend(s, n) - s;
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}
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EXPORT_SYMBOL(strnlen);
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/**
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* strcpy - Copy a %NUL terminated string
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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*
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* returns a pointer to @dest
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*/
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char *strcpy(char *dest, const char *src)
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{
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#if __GNUC__ < 4
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register int r0 asm("0") = 0;
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char *ret = dest;
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asm volatile ("0: mvst %0,%1\n"
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" jo 0b"
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: "+&a" (dest), "+&a" (src) : "d" (r0)
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: "cc", "memory" );
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return ret;
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#else
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return __builtin_strcpy(dest, src);
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#endif
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}
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EXPORT_SYMBOL(strcpy);
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/**
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* strlcpy - Copy a %NUL terminated string into a sized buffer
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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* @size: size of destination buffer
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*
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* Compatible with *BSD: the result is always a valid
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* NUL-terminated string that fits in the buffer (unless,
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* of course, the buffer size is zero). It does not pad
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* out the result like strncpy() does.
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*/
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size_t strlcpy(char *dest, const char *src, size_t size)
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{
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size_t ret = __strend(src) - src;
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if (size) {
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size_t len = (ret >= size) ? size-1 : ret;
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dest[len] = '\0';
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__builtin_memcpy(dest, src, len);
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}
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return ret;
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}
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EXPORT_SYMBOL(strlcpy);
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/**
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* strncpy - Copy a length-limited, %NUL-terminated string
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* @dest: Where to copy the string to
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* @src: Where to copy the string from
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* @n: The maximum number of bytes to copy
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*
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* The result is not %NUL-terminated if the source exceeds
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* @n bytes.
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*/
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char *strncpy(char *dest, const char *src, size_t n)
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{
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size_t len = __strnend(src, n) - src;
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__builtin_memset(dest + len, 0, n - len);
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__builtin_memcpy(dest, src, len);
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return dest;
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}
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EXPORT_SYMBOL(strncpy);
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/**
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* strcat - Append one %NUL-terminated string to another
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* @dest: The string to be appended to
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* @src: The string to append to it
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*
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* returns a pointer to @dest
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*/
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char *strcat(char *dest, const char *src)
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{
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register int r0 asm("0") = 0;
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unsigned long dummy;
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char *ret = dest;
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asm volatile ("0: srst %0,%1\n"
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" jo 0b\n"
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"1: mvst %0,%2\n"
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" jo 1b"
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: "=&a" (dummy), "+a" (dest), "+a" (src)
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: "d" (r0), "0" (0UL) : "cc", "memory" );
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return ret;
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}
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EXPORT_SYMBOL(strcat);
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/**
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* strlcat - Append a length-limited, %NUL-terminated string to another
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* @dest: The string to be appended to
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* @src: The string to append to it
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* @n: The size of the destination buffer.
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*/
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size_t strlcat(char *dest, const char *src, size_t n)
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{
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size_t dsize = __strend(dest) - dest;
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size_t len = __strend(src) - src;
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size_t res = dsize + len;
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if (dsize < n) {
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dest += dsize;
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n -= dsize;
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if (len >= n)
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len = n - 1;
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dest[len] = '\0';
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__builtin_memcpy(dest, src, len);
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}
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return res;
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}
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EXPORT_SYMBOL(strlcat);
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/**
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* strncat - Append a length-limited, %NUL-terminated string to another
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* @dest: The string to be appended to
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* @src: The string to append to it
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* @n: The maximum numbers of bytes to copy
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*
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* returns a pointer to @dest
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*
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* Note that in contrast to strncpy, strncat ensures the result is
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* terminated.
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*/
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char *strncat(char *dest, const char *src, size_t n)
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{
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size_t len = __strnend(src, n) - src;
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char *p = __strend(dest);
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p[len] = '\0';
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__builtin_memcpy(p, src, len);
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return dest;
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}
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EXPORT_SYMBOL(strncat);
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/**
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* strcmp - Compare two strings
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* @cs: One string
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* @ct: Another string
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*
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* returns 0 if @cs and @ct are equal,
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* < 0 if @cs is less than @ct
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* > 0 if @cs is greater than @ct
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*/
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int strcmp(const char *cs, const char *ct)
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{
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register int r0 asm("0") = 0;
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int ret = 0;
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asm volatile ("0: clst %2,%3\n"
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" jo 0b\n"
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" je 1f\n"
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" ic %0,0(%2)\n"
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" ic %1,0(%3)\n"
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" sr %0,%1\n"
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"1:"
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: "+d" (ret), "+d" (r0), "+a" (cs), "+a" (ct)
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: : "cc" );
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return ret;
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}
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EXPORT_SYMBOL(strcmp);
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/**
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* strrchr - Find the last occurrence of a character in a string
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* @s: The string to be searched
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* @c: The character to search for
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*/
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char * strrchr(const char * s, int c)
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{
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size_t len = __strend(s) - s;
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if (len)
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do {
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if (s[len] == (char) c)
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return (char *) s + len;
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} while (--len > 0);
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return NULL;
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}
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EXPORT_SYMBOL(strrchr);
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/**
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* strstr - Find the first substring in a %NUL terminated string
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* @s1: The string to be searched
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* @s2: The string to search for
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*/
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char * strstr(const char * s1,const char * s2)
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{
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int l1, l2;
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l2 = __strend(s2) - s2;
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if (!l2)
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return (char *) s1;
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l1 = __strend(s1) - s1;
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while (l1-- >= l2) {
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register unsigned long r2 asm("2") = (unsigned long) s1;
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register unsigned long r3 asm("3") = (unsigned long) l2;
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register unsigned long r4 asm("4") = (unsigned long) s2;
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register unsigned long r5 asm("5") = (unsigned long) l2;
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int cc;
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asm volatile ("0: clcle %1,%3,0\n"
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" jo 0b\n"
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" ipm %0\n"
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" srl %0,28"
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: "=&d" (cc), "+a" (r2), "+a" (r3),
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"+a" (r4), "+a" (r5) : : "cc" );
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if (!cc)
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return (char *) s1;
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s1++;
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}
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return NULL;
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}
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EXPORT_SYMBOL(strstr);
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/**
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* memchr - Find a character in an area of memory.
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* @s: The memory area
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* @c: The byte to search for
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* @n: The size of the area.
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*
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* returns the address of the first occurrence of @c, or %NULL
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* if @c is not found
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*/
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void *memchr(const void *s, int c, size_t n)
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{
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register int r0 asm("0") = (char) c;
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const void *ret = s + n;
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asm volatile ("0: srst %0,%1\n"
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" jo 0b\n"
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" jl 1f\n"
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" la %0,0\n"
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"1:"
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: "+a" (ret), "+&a" (s) : "d" (r0) : "cc" );
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return (void *) ret;
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}
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EXPORT_SYMBOL(memchr);
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/**
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* memcmp - Compare two areas of memory
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* @cs: One area of memory
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* @ct: Another area of memory
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* @count: The size of the area.
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*/
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int memcmp(const void *cs, const void *ct, size_t n)
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{
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register unsigned long r2 asm("2") = (unsigned long) cs;
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register unsigned long r3 asm("3") = (unsigned long) n;
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register unsigned long r4 asm("4") = (unsigned long) ct;
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register unsigned long r5 asm("5") = (unsigned long) n;
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int ret;
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asm volatile ("0: clcle %1,%3,0\n"
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" jo 0b\n"
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" ipm %0\n"
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" srl %0,28"
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: "=&d" (ret), "+a" (r2), "+a" (r3), "+a" (r4), "+a" (r5)
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: : "cc" );
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if (ret)
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ret = *(char *) r2 - *(char *) r4;
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return ret;
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}
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EXPORT_SYMBOL(memcmp);
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/**
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* memscan - Find a character in an area of memory.
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* @s: The memory area
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* @c: The byte to search for
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* @n: The size of the area.
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*
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* returns the address of the first occurrence of @c, or 1 byte past
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* the area if @c is not found
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*/
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void *memscan(void *s, int c, size_t n)
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{
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register int r0 asm("0") = (char) c;
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const void *ret = s + n;
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asm volatile ("0: srst %0,%1\n"
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" jo 0b\n"
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: "+a" (ret), "+&a" (s) : "d" (r0) : "cc" );
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return (void *) ret;
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}
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EXPORT_SYMBOL(memscan);
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/**
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* memcpy - Copy one area of memory to another
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* @dest: Where to copy to
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* @src: Where to copy from
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* @n: The size of the area.
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*
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* returns a pointer to @dest
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*/
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void *memcpy(void *dest, const void *src, size_t n)
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{
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return __builtin_memcpy(dest, src, n);
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}
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EXPORT_SYMBOL(memcpy);
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/**
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* memset - Fill a region of memory with the given value
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* @s: Pointer to the start of the area.
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* @c: The byte to fill the area with
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* @n: The size of the area.
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*
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* returns a pointer to @s
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*/
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void *memset(void *s, int c, size_t n)
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{
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char *xs;
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if (c == 0)
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return __builtin_memset(s, 0, n);
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xs = (char *) s;
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if (n > 0)
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do {
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*xs++ = c;
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} while (--n > 0);
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return s;
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}
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EXPORT_SYMBOL(memset);
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