string.h

Go to the documentation of this file.

#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));     \
})

#ifndef CONFIG_COLDFIRE
#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;
}
#endif /* CONFIG_COLDFIRE */

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

#define memcmp(d, s, n) __builtin_memcmp(d, s, n)

#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)

#endif

#endif /* _M68K_STRING_H_ */