mirror of https://github.com/ipxe/ipxe.git
[libc] Rewrite string functions
Some of the C library string functions have an unknown provenance. Reimplement all such functions to avoid potential licensing uncertainty. Remove the inline-assembler versions of strlen(), memswap(), and strncmp(); these save a minimal amount of space (around 40 bytes in total) and are not performance-critical. Signed-off-by: Michael Brown <mcb30@ipxe.org>pull/34/head
Michael Brown
parent
b54167b8b6
commit
8ee39f7432
|
|
@ -104,87 +104,3 @@ void * __memmove ( void *dest, const void *src, size_t len ) {
|
|||
return __memcpy_reverse ( dest, src, len );
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Swap memory areas
|
||||
*
|
||||
* @v dest Destination address
|
||||
* @v src Source address
|
||||
* @v len Length
|
||||
* @ret dest Destination address
|
||||
*/
|
||||
void * memswap ( void *dest, void *src, size_t len ) {
|
||||
size_t discard_c;
|
||||
int discard;
|
||||
|
||||
__asm__ __volatile__ ( "\n1:\n\t"
|
||||
"dec %2\n\t"
|
||||
"js 2f\n\t"
|
||||
"movb (%0,%2), %b3\n\t"
|
||||
"xchgb (%1,%2), %b3\n\t"
|
||||
"movb %b3, (%0,%2)\n\t"
|
||||
"jmp 1b\n\t"
|
||||
"2:\n\t"
|
||||
: "=r" ( src ), "=r" ( dest ),
|
||||
"=&c" ( discard_c ), "=&q" ( discard )
|
||||
: "0" ( src ), "1" ( dest ), "2" ( len )
|
||||
: "memory" );
|
||||
|
||||
return dest;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculate length of string
|
||||
*
|
||||
* @v string String
|
||||
* @ret len Length (excluding NUL)
|
||||
*/
|
||||
size_t strlen ( const char *string ) {
|
||||
const char *discard_D;
|
||||
size_t len_plus_one;
|
||||
|
||||
__asm__ __volatile__ ( "repne scasb\n\t"
|
||||
"not %1\n\t"
|
||||
: "=&D" ( discard_D ), "=&c" ( len_plus_one )
|
||||
: "0" ( string ), "1" ( -1UL ), "a" ( 0 ) );
|
||||
|
||||
return ( len_plus_one - 1 );
|
||||
}
|
||||
|
||||
/**
|
||||
* Compare strings (up to a specified length)
|
||||
*
|
||||
* @v str1 First string
|
||||
* @v str2 Second string
|
||||
* @v len Maximum length
|
||||
* @ret diff Difference
|
||||
*/
|
||||
int strncmp ( const char *str1, const char *str2, size_t len ) {
|
||||
const void *discard_S;
|
||||
const void *discard_D;
|
||||
size_t discard_c;
|
||||
int diff;
|
||||
|
||||
__asm__ __volatile__ ( "\n1:\n\t"
|
||||
"dec %2\n\t"
|
||||
"js 2f\n\t"
|
||||
"lodsb\n\t"
|
||||
"scasb\n\t"
|
||||
"jne 3f\n\t"
|
||||
"testb %b3, %b3\n\t"
|
||||
"jnz 1b\n\t"
|
||||
/* Equal */
|
||||
"\n2:\n\t"
|
||||
"xor %3, %3\n\t"
|
||||
"jmp 4f\n\t"
|
||||
/* Not equal; CF indicates difference */
|
||||
"\n3:\n\t"
|
||||
"sbb %3, %3\n\t"
|
||||
"orb $1, %b3\n\t"
|
||||
"\n4:\n\t"
|
||||
: "=&S" ( discard_S ), "=&D" ( discard_D ),
|
||||
"=&c" ( discard_c ), "=&a" ( diff )
|
||||
: "0" ( str1 ), "1" ( str2 ), "2" ( len ) );
|
||||
|
||||
return diff;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -28,8 +28,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
|
|||
*
|
||||
*/
|
||||
|
||||
#define __HAVE_ARCH_MEMCPY
|
||||
|
||||
extern void * __memcpy ( void *dest, const void *src, size_t len );
|
||||
extern void * __memcpy_reverse ( void *dest, const void *src, size_t len );
|
||||
|
||||
|
|
@ -169,8 +167,6 @@ memcpy ( void *dest, const void *src, size_t len ) {
|
|||
}
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_MEMMOVE
|
||||
|
||||
extern void * __memmove ( void *dest, const void *src, size_t len );
|
||||
|
||||
/**
|
||||
|
|
@ -196,8 +192,6 @@ memmove ( void *dest, const void *src, size_t len ) {
|
|||
}
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_MEMSET
|
||||
|
||||
/**
|
||||
* Fill memory region
|
||||
*
|
||||
|
|
@ -217,16 +211,4 @@ static inline void * memset ( void *dest, int fill, size_t len ) {
|
|||
return dest;
|
||||
}
|
||||
|
||||
#define __HAVE_ARCH_MEMSWAP
|
||||
|
||||
extern void * memswap ( void *dest, void *src, size_t len );
|
||||
|
||||
#define __HAVE_ARCH_STRNCMP
|
||||
|
||||
extern int strncmp ( const char *str1, const char *str2, size_t len );
|
||||
|
||||
#define __HAVE_ARCH_STRLEN
|
||||
|
||||
extern size_t strlen ( const char *string );
|
||||
|
||||
#endif /* X86_BITS_STRING_H */
|
||||
|
|
|
|||
|
|
@ -1,353 +1,368 @@
|
|||
/*
|
||||
* Copyright (C) 1991, 1992 Linus Torvalds
|
||||
* Copyright (C) 2004 Tobias Lorenz
|
||||
* Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>.
|
||||
*
|
||||
* string handling functions
|
||||
* based on linux/lib/string.c
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License as
|
||||
* published by the Free Software Foundation; either version 2 of the
|
||||
* License, or (at your option) any later version.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
||||
* 02110-1301, USA.
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_ONLY );
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
/*
|
||||
* stupid library routines.. The optimized versions should generally be found
|
||||
* as inline code in <asm-xx/string.h>
|
||||
*
|
||||
* These are buggy as well..
|
||||
*
|
||||
* * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
|
||||
* - Added strsep() which will replace strtok() soon (because strsep() is
|
||||
* reentrant and should be faster). Use only strsep() in new code, please.
|
||||
*/
|
||||
|
||||
#include <stddef.h>
|
||||
#include <stdint.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <ctype.h>
|
||||
|
||||
/* *** FROM string.c *** */
|
||||
|
||||
#ifndef __HAVE_ARCH_STRCPY
|
||||
/**
|
||||
* strcpy - Copy a %NUL terminated string
|
||||
* @dest: Where to copy the string to
|
||||
* @src: Where to copy the string from
|
||||
*/
|
||||
char * strcpy(char * dest,const char *src)
|
||||
{
|
||||
char *tmp = dest;
|
||||
|
||||
while ((*dest++ = *src++) != '\0')
|
||||
/* nothing */;
|
||||
return tmp;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRNCPY
|
||||
/**
|
||||
* strncpy - Copy a length-limited, %NUL-terminated string
|
||||
* @dest: Where to copy the string to
|
||||
* @src: Where to copy the string from
|
||||
* @count: The maximum number of bytes to copy
|
||||
/** @file
|
||||
*
|
||||
* String functions
|
||||
*
|
||||
* Note that unlike userspace strncpy, this does not %NUL-pad the buffer.
|
||||
* However, the result is not %NUL-terminated if the source exceeds
|
||||
* @count bytes.
|
||||
*/
|
||||
char * strncpy(char * dest,const char *src,size_t count)
|
||||
{
|
||||
char *tmp = dest;
|
||||
|
||||
while (count-- && (*dest++ = *src++) != '\0')
|
||||
/* nothing */;
|
||||
|
||||
return tmp;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRCAT
|
||||
/**
|
||||
* strcat - Append one %NUL-terminated string to another
|
||||
* @dest: The string to be appended to
|
||||
* @src: The string to append to it
|
||||
* Fill memory region
|
||||
*
|
||||
* @v dest Destination region
|
||||
* @v character Fill character
|
||||
* @v len Length
|
||||
* @ret dest Destination region
|
||||
*/
|
||||
char * strcat(char * dest, const char * src)
|
||||
{
|
||||
char *tmp = dest;
|
||||
void * generic_memset ( void *dest, int character, size_t len ) {
|
||||
uint8_t *dest_bytes = dest;
|
||||
|
||||
while (*dest)
|
||||
dest++;
|
||||
while ((*dest++ = *src++) != '\0')
|
||||
;
|
||||
|
||||
return tmp;
|
||||
while ( len-- )
|
||||
*(dest_bytes++) = character;
|
||||
return dest;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRCMP
|
||||
/**
|
||||
* strcmp - Compare two strings
|
||||
* @cs: One string
|
||||
* @ct: Another string
|
||||
* Copy memory region
|
||||
*
|
||||
* @v dest Destination region
|
||||
* @v src Source region
|
||||
* @v len Length
|
||||
* @ret dest Destination region
|
||||
*/
|
||||
int strcmp(const char * cs,const char * ct)
|
||||
{
|
||||
register signed char __res;
|
||||
void * generic_memcpy ( void *dest, const void *src, size_t len ) {
|
||||
const uint8_t *src_bytes = src;
|
||||
uint8_t *dest_bytes = dest;
|
||||
|
||||
while (1) {
|
||||
if ((__res = *cs - *ct++) != 0 || !*cs++)
|
||||
break;
|
||||
while ( len-- )
|
||||
*(dest_bytes++) = *(src_bytes++);
|
||||
return dest;
|
||||
}
|
||||
|
||||
/**
|
||||
* Copy (possibly overlapping) memory region
|
||||
*
|
||||
* @v dest Destination region
|
||||
* @v src Source region
|
||||
* @v len Length
|
||||
* @ret dest Destination region
|
||||
*/
|
||||
void * generic_memmove ( void *dest, const void *src, size_t len ) {
|
||||
const uint8_t *src_bytes = ( src + len );
|
||||
uint8_t *dest_bytes = ( dest + len );
|
||||
|
||||
if ( dest < src )
|
||||
return memcpy ( dest, src, len );
|
||||
while ( len-- )
|
||||
*(--dest_bytes) = *(--src_bytes);
|
||||
return dest;
|
||||
}
|
||||
|
||||
/**
|
||||
* Compare memory regions
|
||||
*
|
||||
* @v first First region
|
||||
* @v second Second region
|
||||
* @v len Length
|
||||
* @ret diff Difference
|
||||
*/
|
||||
int memcmp ( const void *first, const void *second, size_t len ) {
|
||||
const uint8_t *first_bytes = first;
|
||||
const uint8_t *second_bytes = second;
|
||||
int diff;
|
||||
|
||||
while ( len-- ) {
|
||||
diff = ( *(second_bytes++) - *(first_bytes++) );
|
||||
if ( diff )
|
||||
return diff;
|
||||
}
|
||||
|
||||
return __res;
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRNCMP
|
||||
/**
|
||||
* strncmp - Compare two length-limited strings
|
||||
* @cs: One string
|
||||
* @ct: Another string
|
||||
* @count: The maximum number of bytes to compare
|
||||
* Find character within a memory region
|
||||
*
|
||||
* @v src Source region
|
||||
* @v character Character to find
|
||||
* @v len Length
|
||||
* @ret found Found character, or NULL if not found
|
||||
*/
|
||||
int strncmp(const char * cs,const char * ct,size_t count)
|
||||
{
|
||||
register signed char __res = 0;
|
||||
void * memchr ( const void *src, int character, size_t len ) {
|
||||
const uint8_t *src_bytes = src;
|
||||
|
||||
while (count) {
|
||||
if ((__res = *cs - *ct++) != 0 || !*cs++)
|
||||
break;
|
||||
count--;
|
||||
for ( ; len-- ; src_bytes++ ) {
|
||||
if ( *src_bytes == character )
|
||||
return ( ( void * ) src_bytes );
|
||||
}
|
||||
|
||||
return __res;
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRCASECMP
|
||||
int strcasecmp(const char *a, const char *b)
|
||||
{
|
||||
while (*a && *b && (*a & ~0x20) == (*b & ~0x20)) {a++; b++; }
|
||||
return((*a & ~0x20) - (*b & ~0x20));
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRCHR
|
||||
/**
|
||||
* strchr - Find the first occurrence of a character in a string
|
||||
* @s: The string to be searched
|
||||
* @c: The character to search for
|
||||
* Swap memory regions
|
||||
*
|
||||
* @v first First region
|
||||
* @v second Second region
|
||||
* @v len Length
|
||||
* @ret first First region
|
||||
*/
|
||||
char * strchr(const char * s, int c)
|
||||
{
|
||||
for(; *s != (char) c; ++s)
|
||||
if (*s == '\0')
|
||||
void * memswap ( void *first, void *second, size_t len ) {
|
||||
uint8_t *first_bytes = first;
|
||||
uint8_t *second_bytes = second;
|
||||
uint8_t temp;
|
||||
|
||||
for ( ; len-- ; first_bytes++, second_bytes++ ) {
|
||||
temp = *first_bytes;
|
||||
*first_bytes = *second_bytes;
|
||||
*second_bytes = temp;
|
||||
}
|
||||
return first;
|
||||
}
|
||||
|
||||
/**
|
||||
* Compare strings
|
||||
*
|
||||
* @v first First string
|
||||
* @v second Second string
|
||||
* @ret diff Difference
|
||||
*/
|
||||
int strcmp ( const char *first, const char *second ) {
|
||||
|
||||
return strncmp ( first, second, ~( ( size_t ) 0 ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* Compare strings
|
||||
*
|
||||
* @v first First string
|
||||
* @v second Second string
|
||||
* @v max Maximum length to compare
|
||||
* @ret diff Difference
|
||||
*/
|
||||
int strncmp ( const char *first, const char *second, size_t max ) {
|
||||
const uint8_t *first_bytes = ( ( const uint8_t * ) first );
|
||||
const uint8_t *second_bytes = ( ( const uint8_t * ) second );
|
||||
int diff;
|
||||
|
||||
for ( ; max-- ; first_bytes++, second_bytes++ ) {
|
||||
diff = ( *second_bytes - *first_bytes );
|
||||
if ( diff )
|
||||
return diff;
|
||||
if ( ! *first_bytes )
|
||||
return 0;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Compare case-insensitive strings
|
||||
*
|
||||
* @v first First string
|
||||
* @v second Second string
|
||||
* @ret diff Difference
|
||||
*/
|
||||
int strcasecmp ( const char *first, const char *second ) {
|
||||
const uint8_t *first_bytes = ( ( const uint8_t * ) first );
|
||||
const uint8_t *second_bytes = ( ( const uint8_t * ) second );
|
||||
int diff;
|
||||
|
||||
for ( ; ; first_bytes++, second_bytes++ ) {
|
||||
diff = ( toupper ( *second_bytes ) -
|
||||
toupper ( *first_bytes ) );
|
||||
if ( diff )
|
||||
return diff;
|
||||
if ( ! *first_bytes )
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Get length of string
|
||||
*
|
||||
* @v src String
|
||||
* @ret len Length
|
||||
*/
|
||||
size_t strlen ( const char *src ) {
|
||||
|
||||
return strnlen ( src, ~( ( size_t ) 0 ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* Get length of string
|
||||
*
|
||||
* @v src String
|
||||
* @v max Maximum length
|
||||
* @ret len Length
|
||||
*/
|
||||
size_t strnlen ( const char *src, size_t max ) {
|
||||
const uint8_t *src_bytes = ( ( const uint8_t * ) src );
|
||||
size_t len = 0;
|
||||
|
||||
while ( max-- && *(src_bytes++) )
|
||||
len++;
|
||||
return len;
|
||||
}
|
||||
|
||||
/**
|
||||
* Find character within a string
|
||||
*
|
||||
* @v src String
|
||||
* @v character Character to find
|
||||
* @ret found Found character, or NULL if not found
|
||||
*/
|
||||
char * strchr ( const char *src, int character ) {
|
||||
const uint8_t *src_bytes = ( ( const uint8_t * ) src );
|
||||
|
||||
for ( ; ; src_bytes++ ) {
|
||||
if ( *src_bytes == character )
|
||||
return ( ( char * ) src_bytes );
|
||||
if ( ! *src_bytes )
|
||||
return NULL;
|
||||
return (char *) s;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRRCHR
|
||||
/**
|
||||
* strrchr - Find the last occurrence of a character in a string
|
||||
* @s: The string to be searched
|
||||
* @c: The character to search for
|
||||
*/
|
||||
char * strrchr(const char * s, int c)
|
||||
{
|
||||
const char *p = s + strlen(s);
|
||||
do {
|
||||
if (*p == (char)c)
|
||||
return (char *)p;
|
||||
} while (--p >= s);
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRLEN
|
||||
/**
|
||||
* strlen - Find the length of a string
|
||||
* @s: The string to be sized
|
||||
*/
|
||||
size_t strlen(const char * s)
|
||||
{
|
||||
const char *sc;
|
||||
|
||||
for (sc = s; *sc != '\0'; ++sc)
|
||||
/* nothing */;
|
||||
return sc - s;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRNLEN
|
||||
/**
|
||||
* strnlen - Find the length of a length-limited string
|
||||
* @s: The string to be sized
|
||||
* @count: The maximum number of bytes to search
|
||||
*/
|
||||
size_t strnlen(const char * s, size_t count)
|
||||
{
|
||||
const char *sc;
|
||||
|
||||
for (sc = s; count-- && *sc != '\0'; ++sc)
|
||||
/* nothing */;
|
||||
return sc - s;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_MEMSET
|
||||
/**
|
||||
* memset - Fill a region of memory with the given value
|
||||
* @s: Pointer to the start of the area.
|
||||
* @c: The byte to fill the area with
|
||||
* @count: The size of the area.
|
||||
* Find rightmost character within a string
|
||||
*
|
||||
* Do not use memset() to access IO space, use memset_io() instead.
|
||||
* @v src String
|
||||
* @v character Character to find
|
||||
* @ret found Found character, or NULL if not found
|
||||
*/
|
||||
void * memset(void * s,int c,size_t count)
|
||||
{
|
||||
char *xs = (char *) s;
|
||||
char * strrchr ( const char *src, int character ) {
|
||||
const uint8_t *src_bytes = ( ( const uint8_t * ) src );
|
||||
const uint8_t *start = src_bytes;
|
||||
|
||||
while (count--)
|
||||
*xs++ = c;
|
||||
|
||||
return s;
|
||||
while ( *src_bytes )
|
||||
src_bytes++;
|
||||
for ( src_bytes-- ; src_bytes >= start ; src_bytes-- ) {
|
||||
if ( *src_bytes == character )
|
||||
return ( ( char * ) src_bytes );
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_MEMCPY
|
||||
/**
|
||||
* memcpy - Copy one area of memory to another
|
||||
* @dest: Where to copy to
|
||||
* @src: Where to copy from
|
||||
* @count: The size of the area.
|
||||
* Find substring
|
||||
*
|
||||
* You should not use this function to access IO space, use memcpy_toio()
|
||||
* or memcpy_fromio() instead.
|
||||
* @v haystack String
|
||||
* @v needle Substring
|
||||
* @ret found Found substring, or NULL if not found
|
||||
*/
|
||||
void * memcpy(void * dest,const void *src,size_t count)
|
||||
{
|
||||
char *tmp = (char *) dest, *s = (char *) src;
|
||||
char * strstr ( const char *haystack, const char *needle ) {
|
||||
size_t len = strlen ( needle );
|
||||
|
||||
while (count--)
|
||||
*tmp++ = *s++;
|
||||
|
||||
return dest;
|
||||
for ( ; *haystack ; haystack++ ) {
|
||||
if ( memcmp ( haystack, needle, len ) == 0 )
|
||||
return ( ( char * ) haystack );
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_MEMMOVE
|
||||
/**
|
||||
* memmove - Copy one area of memory to another
|
||||
* @dest: Where to copy to
|
||||
* @src: Where to copy from
|
||||
* @count: The size of the area.
|
||||
* Copy string
|
||||
*
|
||||
* Unlike memcpy(), memmove() copes with overlapping areas.
|
||||
* @v dest Destination string
|
||||
* @v src Source string
|
||||
* @ret dest Destination string
|
||||
*/
|
||||
void * memmove(void * dest,const void *src,size_t count)
|
||||
{
|
||||
char *tmp, *s;
|
||||
char * strcpy ( char *dest, const char *src ) {
|
||||
const uint8_t *src_bytes = ( ( const uint8_t * ) src );
|
||||
uint8_t *dest_bytes = ( ( uint8_t * ) dest );
|
||||
|
||||
if (dest <= src) {
|
||||
tmp = (char *) dest;
|
||||
s = (char *) src;
|
||||
while (count--)
|
||||
*tmp++ = *s++;
|
||||
}
|
||||
else {
|
||||
tmp = (char *) dest + count;
|
||||
s = (char *) src + count;
|
||||
while (count--)
|
||||
*--tmp = *--s;
|
||||
}
|
||||
|
||||
return dest;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_MEMCMP
|
||||
/**
|
||||
* memcmp - Compare two areas of memory
|
||||
* @cs: One area of memory
|
||||
* @ct: Another area of memory
|
||||
* @count: The size of the area.
|
||||
*/
|
||||
int memcmp(const void * cs,const void * ct,size_t count)
|
||||
{
|
||||
const unsigned char *su1, *su2;
|
||||
int res = 0;
|
||||
|
||||
for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
|
||||
if ((res = *su1 - *su2) != 0)
|
||||
/* We cannot use strncpy(), since that would pad the destination */
|
||||
for ( ; ; src_bytes++, dest_bytes++ ) {
|
||||
*dest_bytes = *src_bytes;
|
||||
if ( ! *dest_bytes )
|
||||
break;
|
||||
return res;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_STRSTR
|
||||
/**
|
||||
* strstr - Find the first substring in a %NUL terminated string
|
||||
* @s1: The string to be searched
|
||||
* @s2: The string to search for
|
||||
*/
|
||||
char * strstr(const char * s1,const char * s2)
|
||||
{
|
||||
int l1, l2;
|
||||
|
||||
l2 = strlen(s2);
|
||||
if (!l2)
|
||||
return (char *) s1;
|
||||
l1 = strlen(s1);
|
||||
while (l1 >= l2) {
|
||||
l1--;
|
||||
if (!memcmp(s1,s2,l2))
|
||||
return (char *) s1;
|
||||
s1++;
|
||||
}
|
||||
return NULL;
|
||||
return dest;
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifndef __HAVE_ARCH_MEMCHR
|
||||
/**
|
||||
* memchr - Find a character in an area of memory.
|
||||
* @s: The memory area
|
||||
* @c: The byte to search for
|
||||
* @n: The size of the area.
|
||||
* Copy string
|
||||
*
|
||||
* returns the address of the first occurrence of @c, or %NULL
|
||||
* if @c is not found
|
||||
* @v dest Destination string
|
||||
* @v src Source string
|
||||
* @v max Maximum length
|
||||
* @ret dest Destination string
|
||||
*/
|
||||
void * memchr(const void *s, int c, size_t n)
|
||||
{
|
||||
const unsigned char *p = s;
|
||||
while (n-- != 0) {
|
||||
if ((unsigned char)c == *p++) {
|
||||
return (void *)(p-1);
|
||||
}
|
||||
char * strncpy ( char *dest, const char *src, size_t max ) {
|
||||
const uint8_t *src_bytes = ( ( const uint8_t * ) src );
|
||||
uint8_t *dest_bytes = ( ( uint8_t * ) dest );
|
||||
|
||||
for ( ; max ; max--, src_bytes++, dest_bytes++ ) {
|
||||
*dest_bytes = *src_bytes;
|
||||
if ( ! *dest_bytes )
|
||||
break;
|
||||
}
|
||||
return NULL;
|
||||
while ( max-- )
|
||||
*(dest_bytes++) = '\0';
|
||||
return dest;
|
||||
}
|
||||
|
||||
#endif
|
||||
/**
|
||||
* Concatenate string
|
||||
*
|
||||
* @v dest Destination string
|
||||
* @v src Source string
|
||||
* @ret dest Destination string
|
||||
*/
|
||||
char * strcat ( char *dest, const char *src ) {
|
||||
|
||||
char * strndup(const char *s, size_t n)
|
||||
{
|
||||
size_t len = strnlen(s,n);
|
||||
char *new;
|
||||
strcpy ( ( dest + strlen ( dest ) ), src );
|
||||
return dest;
|
||||
}
|
||||
|
||||
new = malloc(len+1);
|
||||
if (new) {
|
||||
new[len] = '\0';
|
||||
memcpy(new,s,len);
|
||||
/**
|
||||
* Duplicate string
|
||||
*
|
||||
* @v src Source string
|
||||
* @ret dup Duplicated string, or NULL if allocation failed
|
||||
*/
|
||||
char * strdup ( const char *src ) {
|
||||
|
||||
return strndup ( src, ~( ( size_t ) 0 ) );
|
||||
}
|
||||
|
||||
/**
|
||||
* Duplicate string
|
||||
*
|
||||
* @v src Source string
|
||||
* @v max Maximum length
|
||||
* @ret dup Duplicated string, or NULL if allocation failed
|
||||
*/
|
||||
char * strndup ( const char *src, size_t max ) {
|
||||
size_t len = strnlen ( src, max );
|
||||
char *dup;
|
||||
|
||||
dup = malloc ( len + 1 /* NUL */ );
|
||||
if ( dup ) {
|
||||
memcpy ( dup, src, len );
|
||||
dup[len] = '\0';
|
||||
}
|
||||
return new;
|
||||
}
|
||||
|
||||
char * strdup(const char *s) {
|
||||
return strndup(s, ~((size_t)0));
|
||||
return dup;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -75,7 +75,7 @@ static struct errortab * find_closest_error ( int errno ) {
|
|||
* call to strerror().
|
||||
*
|
||||
*/
|
||||
const char * strerror ( int errno ) {
|
||||
char * strerror ( int errno ) {
|
||||
static char errbuf[64];
|
||||
struct errortab *errortab;
|
||||
|
||||
|
|
|
|||
|
|
@ -1,46 +1,53 @@
|
|||
/*
|
||||
* Copyright (C) 1991, 1992 Linus Torvalds
|
||||
* Copyright (C) 2004 Tobias Lorenz
|
||||
#ifndef _STRING_H
|
||||
#define _STRING_H
|
||||
|
||||
/** @file
|
||||
*
|
||||
* string handling functions
|
||||
* based on linux/include/linux/ctype.h
|
||||
* and linux/include/linux/string.h
|
||||
* String functions
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_ONLY );
|
||||
|
||||
#ifndef ETHERBOOT_STRING_H
|
||||
#define ETHERBOOT_STRING_H
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
#include <stddef.h>
|
||||
#include <bits/string.h>
|
||||
|
||||
char * strcpy(char * dest,const char *src) __nonnull;
|
||||
char * strncpy(char * dest,const char *src,size_t count) __nonnull;
|
||||
char * strcat(char * dest, const char * src) __nonnull;
|
||||
int __pure strcmp(const char * cs,const char * ct) __nonnull;
|
||||
int __pure strncmp(const char * cs,const char * ct,
|
||||
size_t count) __nonnull;
|
||||
char * __pure strchr(const char * s, int c) __nonnull;
|
||||
char * __pure strrchr(const char * s, int c) __nonnull;
|
||||
size_t __pure strlen(const char * s) __nonnull;
|
||||
size_t __pure strnlen(const char * s, size_t count) __nonnull;
|
||||
char * __pure strpbrk(const char * cs,const char * ct) __nonnull;
|
||||
char * strsep(char **s, const char *ct) __nonnull;
|
||||
void * memset(void * s,int c,size_t count) __nonnull;
|
||||
/* Architecture-specific code is expected to provide these functions,
|
||||
* but may instead explicitly choose to use the generic versions.
|
||||
*/
|
||||
void * memset ( void *dest, int character, size_t len ) __nonnull;
|
||||
void * memcpy ( void *dest, const void *src, size_t len ) __nonnull;
|
||||
void * memmove(void * dest,const void *src,size_t count) __nonnull;
|
||||
int __pure memcmp(const void * cs,const void * ct,
|
||||
size_t count) __nonnull;
|
||||
char * __pure strstr(const char * s1,const char * s2) __nonnull;
|
||||
void * __pure memchr(const void *s, int c, size_t n) __nonnull;
|
||||
char * __malloc strdup(const char *s) __nonnull;
|
||||
char * __malloc strndup(const char *s, size_t n) __nonnull;
|
||||
void * memmove ( void *dest, const void *src, size_t len ) __nonnull;
|
||||
extern void * generic_memset ( void *dest, int character,
|
||||
size_t len ) __nonnull;
|
||||
extern void * generic_memcpy ( void *dest, const void *src,
|
||||
size_t len ) __nonnull;
|
||||
extern void * generic_memmove ( void *dest, const void *src,
|
||||
size_t len ) __nonnull;
|
||||
|
||||
extern const char * __pure strerror ( int errno );
|
||||
extern int __pure memcmp ( const void *first, const void *second,
|
||||
size_t len ) __nonnull;
|
||||
extern void * __pure memchr ( const void *src, int character,
|
||||
size_t len ) __nonnull;
|
||||
extern void * memswap ( void *dest, void *src, size_t len ) __nonnull;
|
||||
extern int __pure strcmp ( const char *first, const char *second ) __nonnull;
|
||||
extern int __pure strncmp ( const char *first, const char *second,
|
||||
size_t max ) __nonnull;
|
||||
extern size_t __pure strlen ( const char *src ) __nonnull;
|
||||
extern size_t __pure strnlen ( const char *src, size_t max ) __nonnull;
|
||||
extern char * __pure strchr ( const char *src, int character ) __nonnull;
|
||||
extern char * __pure strrchr ( const char *src, int character ) __nonnull;
|
||||
extern char * __pure strstr ( const char *haystack,
|
||||
const char *needle ) __nonnull;
|
||||
extern char * strcpy ( char *dest, const char *src ) __nonnull;
|
||||
extern char * strncpy ( char *dest, const char *src, size_t max ) __nonnull;
|
||||
extern char * strcat ( char *dest, const char *src ) __nonnull;
|
||||
extern char * __malloc strdup ( const char *src ) __nonnull;
|
||||
extern char * __malloc strndup ( const char *src, size_t max ) __nonnull;
|
||||
extern char * __pure strpbrk ( const char *string,
|
||||
const char *delim ) __nonnull;
|
||||
extern char * strsep ( char **string, const char *delim ) __nonnull;
|
||||
|
||||
#endif /* ETHERBOOT_STRING */
|
||||
extern char * __pure strerror ( int errno );
|
||||
|
||||
#endif /* _STRING_H */
|
||||
|
|
|
|||
|
|
@ -1,12 +1,23 @@
|
|||
#ifndef _STRINGS_H
|
||||
#define _STRINGS_H
|
||||
|
||||
/** @file
|
||||
*
|
||||
* String functions
|
||||
*
|
||||
*/
|
||||
|
||||
FILE_LICENCE ( GPL2_OR_LATER );
|
||||
|
||||
#include <limits.h>
|
||||
#include <string.h>
|
||||
#include <bits/strings.h>
|
||||
|
||||
/**
|
||||
* Find last (i.e. most significant) set bit
|
||||
*
|
||||
* @v x Value
|
||||
* @ret msb Most significant bit set in value (LSB=1), or zero
|
||||
*/
|
||||
static inline __attribute__ (( always_inline )) int
|
||||
__constant_flsll ( unsigned long long x ) {
|
||||
int r = 0;
|
||||
|
|
@ -41,6 +52,12 @@ __constant_flsll ( unsigned long long x ) {
|
|||
return r;
|
||||
}
|
||||
|
||||
/**
|
||||
* Find last (i.e. most significant) set bit
|
||||
*
|
||||
* @v x Value
|
||||
* @ret msb Most significant bit set in value (LSB=1), or zero
|
||||
*/
|
||||
static inline __attribute__ (( always_inline )) int
|
||||
__constant_flsl ( unsigned long x ) {
|
||||
return __constant_flsll ( x );
|
||||
|
|
@ -49,24 +66,55 @@ __constant_flsl ( unsigned long x ) {
|
|||
int __flsll ( long long x );
|
||||
int __flsl ( long x );
|
||||
|
||||
/**
|
||||
* Find last (i.e. most significant) set bit
|
||||
*
|
||||
* @v x Value
|
||||
* @ret msb Most significant bit set in value (LSB=1), or zero
|
||||
*/
|
||||
#define flsll( x ) \
|
||||
( __builtin_constant_p ( x ) ? __constant_flsll ( x ) : __flsll ( x ) )
|
||||
|
||||
/**
|
||||
* Find last (i.e. most significant) set bit
|
||||
*
|
||||
* @v x Value
|
||||
* @ret msb Most significant bit set in value (LSB=1), or zero
|
||||
*/
|
||||
#define flsl( x ) \
|
||||
( __builtin_constant_p ( x ) ? __constant_flsl ( x ) : __flsl ( x ) )
|
||||
|
||||
/**
|
||||
* Find last (i.e. most significant) set bit
|
||||
*
|
||||
* @v x Value
|
||||
* @ret msb Most significant bit set in value (LSB=1), or zero
|
||||
*/
|
||||
#define fls( x ) flsl ( x )
|
||||
|
||||
extern int strcasecmp ( const char *s1, const char *s2 );
|
||||
|
||||
/**
|
||||
* Copy memory
|
||||
*
|
||||
* @v src Source
|
||||
* @v dest Destination
|
||||
* @v len Length
|
||||
*/
|
||||
static inline __attribute__ (( always_inline )) void
|
||||
bcopy ( const void *src, void *dest, size_t n ) {
|
||||
memmove ( dest, src, n );
|
||||
bcopy ( const void *src, void *dest, size_t len ) {
|
||||
memmove ( dest, src, len );
|
||||
}
|
||||
|
||||
/**
|
||||
* Zero memory
|
||||
*
|
||||
* @v dest Destination
|
||||
* @v len Length
|
||||
*/
|
||||
static inline __attribute__ (( always_inline )) void
|
||||
bzero ( void *s, size_t n ) {
|
||||
memset ( s, 0, n );
|
||||
bzero ( void *dest, size_t len ) {
|
||||
memset ( dest, 0, len );
|
||||
}
|
||||
|
||||
int __pure strcasecmp ( const char *first, const char *second ) __nonnull;
|
||||
|
||||
#endif /* _STRINGS_H */
|
||||
|
|
|
|||
Loading…
Reference in New Issue