root/include/asm-m68k/string.h

INCLUDED FROM

DEFINITIONS

1. __kernel_strlen
2. __kernel_strcpy
3. strnlen
4. strncpy
5. strchr
6. strcmp

#ifndef _M68K_STRING_H_
#define _M68K_STRING_H_

#include <linux/types.h>
#include <linux/compiler.h>

static inline size_t __kernel_strlen(const char *s)
{
        const char *sc;

        for (sc = s; *sc++; )
                ;
        return sc - s - 1;
}

static inline char *__kernel_strcpy(char *dest, const char *src)
{
        char *xdest = dest;

        asm volatile ("\n"
                "1:     move.b  (%1)+,(%0)+\n"
                "       jne     1b"
                : "+a" (dest), "+a" (src)
                : : "memory");
        return xdest;
}

#ifndef __IN_STRING_C

#define __HAVE_ARCH_STRLEN
#define strlen(s)       (__builtin_constant_p(s) ?      \
                         __builtin_strlen(s) :          \
                         __kernel_strlen(s))

#define __HAVE_ARCH_STRNLEN
static inline size_t strnlen(const char *s, size_t count)
{
        const char *sc = s;

        asm volatile ("\n"
                "1:     subq.l  #1,%1\n"
                "       jcs     2f\n"
                "       tst.b   (%0)+\n"
                "       jne     1b\n"
                "       subq.l  #1,%0\n"
                "2:"
                : "+a" (sc), "+d" (count));
        return sc - s;
}

#define __HAVE_ARCH_STRCPY
#if __GNUC__ >= 4
#define strcpy(d, s)    (__builtin_constant_p(s) &&     \
                         __builtin_strlen(s) <= 32 ?    \
                         __builtin_strcpy(d, s) :       \
                         __kernel_strcpy(d, s))
#else
#define strcpy(d, s)    __kernel_strcpy(d, s)
#endif

#define __HAVE_ARCH_STRNCPY
static inline char *strncpy(char *dest, const char *src, size_t n)
{
        char *xdest = dest;

        asm volatile ("\n"
                "       jra     2f\n"
                "1:     move.b  (%1),(%0)+\n"
                "       jeq     2f\n"
                "       addq.l  #1,%1\n"
                "2:     subq.l  #1,%2\n"
                "       jcc     1b\n"
                : "+a" (dest), "+a" (src), "+d" (n)
                : : "memory");
        return xdest;
}

#define __HAVE_ARCH_STRCAT
#define strcat(d, s)    ({                      \
        char *__d = (d);                        \
        strcpy(__d + strlen(__d), (s));         \
})

#define __HAVE_ARCH_STRCHR
static inline char *strchr(const char *s, int c)
{
        char sc, ch = c;

        for (; (sc = *s++) != ch; ) {
                if (!sc)
                        return NULL;
        }
        return (char *)s - 1;
}

#define __HAVE_ARCH_STRCMP
static inline int strcmp(const char *cs, const char *ct)
{
        char res;

        asm ("\n"
                "1:     move.b  (%0)+,%2\n"     /* get *cs */
                "       cmp.b   (%1)+,%2\n"     /* compare a byte */
                "       jne     2f\n"           /* not equal, break out */
                "       tst.b   %2\n"           /* at end of cs? */
                "       jne     1b\n"           /* no, keep going */
                "       jra     3f\n"           /* strings are equal */
                "2:     sub.b   -(%1),%2\n"     /* *cs - *ct */
                "3:"
                : "+a" (cs), "+a" (ct), "=d" (res));
        return res;
}

#define __HAVE_ARCH_MEMSET
extern void *memset(void *, int, __kernel_size_t);
#define memset(d, c, n) __builtin_memset(d, c, n)

#define __HAVE_ARCH_MEMCPY
extern void *memcpy(void *, const void *, __kernel_size_t);
#define memcpy(d, s, n) __builtin_memcpy(d, s, n)

#define __HAVE_ARCH_MEMMOVE
extern void *memmove(void *, const void *, __kernel_size_t);

#define __HAVE_ARCH_MEMCMP
extern int memcmp(const void *, const void *, __kernel_size_t);
#define memcmp(d, s, n) __builtin_memcmp(d, s, n)

#endif

#endif /* _M68K_STRING_H_ */