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#ifndef _BITS_STRING_H
#define _BITS_STRING_H
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* String functions
*
*/
extern void riscv_bzero ( void *dest, size_t len );
extern void riscv_memset ( void *dest, size_t len, int character );
extern void riscv_memcpy ( void *dest, const void *src, size_t len );
extern void riscv_memmove ( void *dest, const void *src, size_t len );
/**
* Fill memory region
*
* @v dest Destination region
* @v character Fill character
* @v len Length
* @ret dest Destination region
*/
static inline __attribute__ (( always_inline )) void *
memset ( void *dest, int character, size_t len ) {
/* For zeroing larger or non-constant lengths, use the
* optimised variable-length zeroing code.
*/
if ( __builtin_constant_p ( character ) && ( character == 0 ) ) {
riscv_bzero ( dest, len );
return dest;
}
/* Not necessarily zeroing: use basic variable-length code */
riscv_memset ( dest, len, character );
return dest;
}
/**
* Copy memory region
*
* @v dest Destination region
* @v src Source region
* @v len Length
* @ret dest Destination region
*/
static inline __attribute__ (( always_inline )) void *
memcpy ( void *dest, const void *src, size_t len ) {
/* Otherwise, use variable-length code */
riscv_memcpy ( dest, src, len );
return dest;
}
/**
* Copy (possibly overlapping) memory region
*
* @v dest Destination region
* @v src Source region
* @v len Length
* @ret dest Destination region
*/
static inline __attribute__ (( always_inline )) void *
memmove ( void *dest, const void *src, size_t len ) {
ssize_t offset = ( dest - src );
/* If direction of copy is known to be forwards at build time,
* then use variable-length memcpy().
*/
if ( __builtin_constant_p ( offset ) && ( offset <= 0 ) ) {
riscv_memcpy ( dest, src, len );
return dest;
}
/* Otherwise, use ambidirectional copy */
riscv_memmove ( dest, src, len );
return dest;
}
#endif /* _BITS_STRING_H */
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