u-boot/arch/arm/include/asm/string.h

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#ifndef __ASM_ARM_STRING_H
#define __ASM_ARM_STRING_H
#include <config.h>
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/*
* We don't do inline string functions, since the
* optimised inline asm versions are not small.
*/
#undef __HAVE_ARCH_STRRCHR
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extern char * strrchr(const char * s, int c);
#undef __HAVE_ARCH_STRCHR
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extern char * strchr(const char * s, int c);
#if CONFIG_IS_ENABLED(USE_ARCH_MEMCPY)
#define __HAVE_ARCH_MEMCPY
#endif
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extern void * memcpy(void *, const void *, __kernel_size_t);
#undef __HAVE_ARCH_MEMMOVE
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extern void * memmove(void *, const void *, __kernel_size_t);
#undef __HAVE_ARCH_MEMCHR
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extern void * memchr(const void *, int, __kernel_size_t);
#undef __HAVE_ARCH_MEMZERO
#if CONFIG_IS_ENABLED(USE_ARCH_MEMSET)
#define __HAVE_ARCH_MEMSET
#endif
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extern void * memset(void *, int, __kernel_size_t);
#if 0
extern void __memzero(void *ptr, __kernel_size_t n);
#define memset(p,v,n) \
({ \
if ((n) != 0) { \
if (__builtin_constant_p((v)) && (v) == 0) \
__memzero((p),(n)); \
else \
memset((p),(v),(n)); \
} \
(p); \
})
#define memzero(p,n) ({ if ((n) != 0) __memzero((p),(n)); (p); })
#else
extern void memzero(void *ptr, __kernel_size_t n);
#endif
#endif