194 lines
3.6 KiB
C
194 lines
3.6 KiB
C
#ifndef _STRINGS_H
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#define _STRINGS_H
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/** @file
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*
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* String functions
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <string.h>
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#include <bits/strings.h>
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/**
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* Find first (i.e. least significant) set bit
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*
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* @v x Value
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* @ret lsb Least significant bit set in value (LSB=1), or zero
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*/
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static inline __attribute__ (( always_inline )) int
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__constant_ffsll ( unsigned long long x ) {
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int r = 0;
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if ( ! ( x & 0x00000000ffffffffULL ) ) {
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x >>= 32;
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r += 32;
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}
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if ( ! ( x & 0x0000ffffUL ) ) {
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x >>= 16;
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r += 16;
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}
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if ( ! ( x & 0x00ff ) ) {
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x >>= 8;
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r += 8;
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}
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if ( ! ( x & 0x0f ) ) {
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x >>= 4;
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r += 4;
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}
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if ( ! ( x & 0x3 ) ) {
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x >>= 2;
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r += 2;
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}
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if ( ! ( x & 0x1 ) ) {
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x >>= 1;
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r += 1;
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}
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return ( x ? ( r + 1 ) : 0 );
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}
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/**
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* Find first (i.e. least significant) set bit
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*
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* @v x Value
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* @ret lsb Least significant bit set in value (LSB=1), or zero
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*/
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static inline __attribute__ (( always_inline )) int
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__constant_ffsl ( unsigned long x ) {
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return __constant_ffsll ( x );
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}
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/**
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* Find last (i.e. most significant) set bit
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*
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* @v x Value
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* @ret msb Most significant bit set in value (LSB=1), or zero
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*/
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static inline __attribute__ (( always_inline )) int
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__constant_flsll ( unsigned long long x ) {
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int r = 0;
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if ( x & 0xffffffff00000000ULL ) {
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x >>= 32;
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r += 32;
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}
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if ( x & 0xffff0000UL ) {
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x >>= 16;
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r += 16;
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}
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if ( x & 0xff00 ) {
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x >>= 8;
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r += 8;
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}
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if ( x & 0xf0 ) {
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x >>= 4;
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r += 4;
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}
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if ( x & 0xc ) {
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x >>= 2;
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r += 2;
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}
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if ( x & 0x2 ) {
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x >>= 1;
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r += 1;
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}
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return ( x ? ( r + 1 ) : 0 );
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}
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/**
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* Find last (i.e. most significant) set bit
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*
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* @v x Value
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* @ret msb Most significant bit set in value (LSB=1), or zero
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*/
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static inline __attribute__ (( always_inline )) int
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__constant_flsl ( unsigned long x ) {
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return __constant_flsll ( x );
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}
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int __ffsll ( long long x );
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int __ffsl ( long x );
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int __flsll ( long long x );
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int __flsl ( long x );
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/**
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* Find first (i.e. least significant) set bit
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*
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* @v x Value
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* @ret lsb Least significant bit set in value (LSB=1), or zero
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*/
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#define ffsll( x ) \
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( __builtin_constant_p ( x ) ? __constant_ffsll ( x ) : __ffsll ( x ) )
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/**
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* Find first (i.e. least significant) set bit
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*
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* @v x Value
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* @ret lsb Least significant bit set in value (LSB=1), or zero
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*/
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#define ffsl( x ) \
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( __builtin_constant_p ( x ) ? __constant_ffsl ( x ) : __ffsl ( x ) )
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/**
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* Find first (i.e. least significant) set bit
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*
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* @v x Value
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* @ret lsb Least significant bit set in value (LSB=1), or zero
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*/
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#define ffs( x ) ffsl ( x )
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/**
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* Find last (i.e. most significant) set bit
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*
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* @v x Value
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* @ret msb Most significant bit set in value (LSB=1), or zero
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*/
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#define flsll( x ) \
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( __builtin_constant_p ( x ) ? __constant_flsll ( x ) : __flsll ( x ) )
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/**
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* Find last (i.e. most significant) set bit
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*
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* @v x Value
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* @ret msb Most significant bit set in value (LSB=1), or zero
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*/
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#define flsl( x ) \
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( __builtin_constant_p ( x ) ? __constant_flsl ( x ) : __flsl ( x ) )
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/**
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* Find last (i.e. most significant) set bit
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*
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* @v x Value
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* @ret msb Most significant bit set in value (LSB=1), or zero
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*/
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#define fls( x ) flsl ( x )
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/**
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* Copy memory
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*
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* @v src Source
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* @v dest Destination
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* @v len Length
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*/
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static inline __attribute__ (( always_inline )) void
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bcopy ( const void *src, void *dest, size_t len ) {
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memmove ( dest, src, len );
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}
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/**
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* Zero memory
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*
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* @v dest Destination
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* @v len Length
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*/
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static inline __attribute__ (( always_inline )) void
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bzero ( void *dest, size_t len ) {
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memset ( dest, 0, len );
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}
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int __pure strcasecmp ( const char *first, const char *second ) __nonnull;
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#endif /* _STRINGS_H */
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