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|
/* Machine-independant string function optimizations.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _STRING_H
# error "Never use <bits/string2.h> directly; include <string.h> instead."
#endif
#ifndef __NO_STRING_INLINES
/* Unlike the definitions in the header <bits/string.h> the
definitions contained here are not optimizing down to assembler
level. These optimizations are not always a good idea since this
means the code size increases a lot. Instead the definitions here
optimize some functions in a way which does not dramatically
increase the code size and which does not use assembler. The main
trick is to use GNU CC's `__builtin_constant_p' function.
Every function XXX which has a defined version in
<bits/string.h> must be accompanied by a symbol _HAVE_STRING_ARCH_XXX
to make sure we don't get redefinitions.
We must use here macros instead of inline functions since the
trick won't work with the later. */
#ifdef __cplusplus
# define __STRING_INLINE inline
#else
# define __STRING_INLINE extern __inline
#endif
#if _STRING_ARCH_unaligned
/* If we can do unaligned memory accesses we must know the endianess. */
# include <endian.h>
# include <bits/types.h>
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define __STRING2_SMALL_GET16(src, idx) \
(((__const unsigned char *) (src))[idx + 1] << 8 \
| ((__const unsigned char *) (src))[idx])
# define __STRING2_SMALL_GET32(src, idx) \
(((((__const unsigned char *) (src))[idx + 3] << 8 \
| ((__const char *) (src))[idx + 2]) << 8 \
| ((__const unsigned char *) (src))[idx + 1]) << 8 \
| ((__const unsigned char *) (src))[idx])
# else
# define __STRING2_SMALL_GET16(src, idx) \
(((__const unsigned char *) (src))[idx] << 8 \
| ((__const unsigned char *) (src))[idx + 1])
# define __STRING2_SMALL_GET32(src, idx) \
(((((__const unsigned char *) (src))[idx] << 8 \
| ((__const unsigned char *) (src))[idx + 1]) << 8 \
| ((__const unsigned char *) (src))[idx + 2]) << 8 \
| ((__const unsigned char *) (src))[idx + 3])
# endif
#else
/* These are a few types we need for the optimizations if we cannot
use unaligned memory accesses. */
# define __STRING2_COPY_TYPE(N) \
typedef struct { char __arr[N]; } \
__STRING2_COPY_ARR##N __attribute__ ((packed))
__STRING2_COPY_TYPE (2);
__STRING2_COPY_TYPE (3);
__STRING2_COPY_TYPE (4);
__STRING2_COPY_TYPE (5);
__STRING2_COPY_TYPE (6);
__STRING2_COPY_TYPE (7);
__STRING2_COPY_TYPE (8);
# undef __STRING2_COPY_TYPE
#endif
/* Dereferencing a pointer arg to run sizeof on it fails for the
void pointer case, so we use this instead. */
#define __string2_1bptr_p(x) (((size_t) ((x) + 1) - (size_t) (x)) == 1)
/* Set N bytes of S to C. */
#ifndef _HAVE_STRING_ARCH_memset
# define memset(s, c, n) \
(__extension__ (__builtin_constant_p (c) && (c) == '\0' \
? ({ void *__s = (s); __bzero (__s, n); __s; }) \
: memset (s, c, n)))
#endif
/* Copy SRC to DEST. */
#ifndef _HAVE_STRING_ARCH_strcpy
# define strcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
? __strcpy_small (dest, src, strlen (src) + 1) \
: (char *) memcpy (dest, src, strlen (src) + 1)) \
: strcpy (dest, src)))
# if _STRING_ARCH_unaligned
# define __strcpy_small(dest, src, srclen) \
(__extension__ ({ unsigned char *__dest = (unsigned char *) (dest); \
switch (srclen) \
{ \
case 1: \
*__dest = '\0'; \
break; \
case 2: \
*((__uint16_t *) __dest) = \
__STRING2_SMALL_GET16 (src, 0); \
break; \
case 3: \
*((__uint16_t *) __dest) = \
__STRING2_SMALL_GET16 (src, 0); \
*(__dest + 2) = '\0'; \
break; \
case 4: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
break; \
case 5: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*(__dest + 4) = '\0'; \
break; \
case 6: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint16_t *) (__dest + 4)) = \
__STRING2_SMALL_GET16 (src, 4); \
break; \
case 7: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint16_t *) (__dest + 4)) = \
__STRING2_SMALL_GET16 (src, 4); \
*(__dest + 6) = '\0'; \
break; \
case 8: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint32_t *) (__dest + 4)) = \
__STRING2_SMALL_GET32 (src, 4); \
break; \
} \
(char *) __dest; }))
# else
# define __strcpy_small(dest, src, srclen) \
(__extension__ ({ unsigned char *__dest = (unsigned char *) (dest); \
switch (srclen) \
{ \
case 1: \
*__dest = '\0'; \
break; \
case 2: \
*((__STRING2_COPY_ARR2 *) __dest) = \
((__STRING2_COPY_ARR2) \
{ { ((__const unsigned char *) (src))[0], \
'\0' } }); \
break; \
case 3: \
*((__STRING2_COPY_ARR3 *) __dest) = \
((__STRING2_COPY_ARR3) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
'\0' } }); \
break; \
case 4: \
*((__STRING2_COPY_ARR4 *) __dest) = \
((__STRING2_COPY_ARR4) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
'\0' } }); \
break; \
case 5: \
*((__STRING2_COPY_ARR5 *) __dest) = \
((__STRING2_COPY_ARR5) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
'\0' } }); \
break; \
case 6: \
*((__STRING2_COPY_ARR6 *) __dest) = \
((__STRING2_COPY_ARR6) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
'\0' } }); \
break; \
case 7: \
*((__STRING2_COPY_ARR7 *) __dest) = \
((__STRING2_COPY_ARR7) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
((__const unsigned char *) (src))[5], \
'\0' } }); \
break; \
case 8: \
*((__STRING2_COPY_ARR8 *) __dest) = \
((__STRING2_COPY_ARR8) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
((__const unsigned char *) (src))[5], \
((__const unsigned char *) (src))[6], \
'\0' } }); \
break; \
} \
(char *) __dest; }))
# endif
#endif
/* Copy SRC to DEST, returning pointer to final NUL byte. */
#ifdef __USE_GNU
# ifndef _HAVE_STRING_ARCH_stpcpy
# define __stpcpy(dest, src) \
(__extension__ (__builtin_constant_p (src) \
? (__string2_1bptr_p (src) && strlen (src) + 1 <= 8 \
? __stpcpy_small (dest, src, strlen (src) + 1) \
: ((char *) __mempcpy (dest, src, strlen (src) + 1) - 1))\
: __stpcpy (dest, src)))
/* In glibc we use this function frequently but for namespace reasons
we have to use the name `__stpcpy'. */
# define stpcpy(dest, src) __stpcpy (dest, src)
# if _STRING_ARCH_unaligned
# define __stpcpy_small(dest, src, srclen) \
(__extension__ ({ unsigned char *__dest = (unsigned char *) (dest); \
switch (srclen) \
{ \
case 1: \
*__dest = '\0'; \
break; \
case 2: \
*((__uint16_t *) __dest) = \
__STRING2_SMALL_GET16 (src, 0); \
++__dest; \
break; \
case 3: \
*((__uint16_t *) __dest) = \
__STRING2_SMALL_GET16 (src, 0); \
__dest += sizeof (__uint16_t); \
*__dest = '\0'; \
break; \
case 4: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
__dest += 3; \
break; \
case 5: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
__dest += sizeof (__uint32_t); \
*__dest = '\0'; \
break; \
case 6: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint16_t *) (__dest + 4)) = \
__STRING2_SMALL_GET16 (src, 4); \
__dest += 5; \
break; \
case 7: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint16_t *) (__dest + 4)) = \
__STRING2_SMALL_GET16 (src, 4); \
__dest += 6; \
*__dest = '\0'; \
break; \
case 8: \
*((__uint32_t *) __dest) = \
__STRING2_SMALL_GET32 (src, 0); \
*((__uint32_t *) (__dest + 4)) = \
__STRING2_SMALL_GET32 (src, 4); \
__dest += 7; \
break; \
} \
(char *) __dest; }))
# else
# define __stpcpy_small(dest, src, srclen) \
(__extension__ ({ unsigned char *__dest = (unsigned char *) (dest); \
switch (srclen) \
{ \
case 1: \
*__dest = '\0'; \
break; \
case 2: \
*((__STRING2_COPY_ARR2 *) __dest) = \
((__STRING2_COPY_ARR2) \
{ { ((__const unsigned char *) (src))[0], \
'\0' } }); \
break; \
case 3: \
*((__STRING2_COPY_ARR3 *) __dest) = \
((__STRING2_COPY_ARR3) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
'\0' } }); \
break; \
case 4: \
*((__STRING2_COPY_ARR4 *) __dest) = \
((__STRING2_COPY_ARR4) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
'\0' } }); \
break; \
case 5: \
*((__STRING2_COPY_ARR5 *) __dest) = \
((__STRING2_COPY_ARR5) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
'\0' } }); \
break; \
case 6: \
*((__STRING2_COPY_ARR6 *) __dest) = \
((__STRING2_COPY_ARR6) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
'\0' } }); \
break; \
case 7: \
*((__STRING2_COPY_ARR7 *) __dest) = \
((__STRING2_COPY_ARR7) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
((__const unsigned char *) (src))[5], \
'\0' } }); \
break; \
case 8: \
*((__STRING2_COPY_ARR8 *) __dest) = \
((__STRING2_COPY_ARR8) \
{ { ((__const unsigned char *) (src))[0], \
((__const unsigned char *) (src))[1], \
((__const unsigned char *) (src))[2], \
((__const unsigned char *) (src))[3], \
((__const unsigned char *) (src))[4], \
((__const unsigned char *) (src))[5], \
((__const unsigned char *) (src))[6], \
'\0' } }); \
break; \
} \
(char *) (__dest + ((srclen) - 1)); }))
# endif
# endif
#endif
/* Copy no more than N characters of SRC to DEST. */
#ifndef _HAVE_STRING_ARCH_strncpy
# if defined _HAVE_STRING_ARCH_memset && defined _HAVE_STRING_ARCH_mempcpy
# define strncpy(dest, src, n) \
(__extension__ ({ char *__dest = (dest); \
__builtin_constant_p (src) && __builtin_constant_p (n) \
? (strlen (src) + 1 >= ((size_t) (n)) \
? (char *) memcpy (__dest, src, n) \
: (memset (__mempcpy (__dest, src, strlen (src)), \
'\0', n - strlen (src)), \
__dest)) \
: strncpy (__dest, src, n); }))
# else
# define strncpy(dest, src, n) \
(__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \
? (strlen (src) + 1 >= ((size_t) (n)) \
? (char *) memcpy (dest, src, n) \
: strncpy (dest, src, n)) \
: strncpy (dest, src, n)))
# endif
#endif
/* Append no more than N characters from SRC onto DEST. */
#ifndef _HAVE_STRING_ARCH_strncat
# ifdef _HAVE_STRING_ARCH_strchr
# define strncat(dest, src, n) \
(__extension__ ({ char *__dest = (dest); \
__builtin_constant_p (src) && __builtin_constant_p (n) \
? (strlen (src) < ((size_t) (n)) \
? strcat (__dest, src) \
: (memcpy (strchr (__dest, '\0'), src, n), __dest)) \
: strncat (dest, src, n); }))
# else
# define strncat(dest, src, n) \
(__extension__ (__builtin_constant_p (src) && __builtin_constant_p (n) \
? (strlen (src) < ((size_t) (n)) \
? strcat (dest, src) \
: strncat (dest, src, n)) \
: strncat (dest, src, n)))
# endif
#endif
/* Compare characters of S1 and S2. */
#ifndef _HAVE_STRING_ARCH_strcmp
# define strcmp(s1, s2) \
(__extension__ (__builtin_constant_p (s1) && __builtin_constant_p (s2) \
&& (!__string2_1bptr_p (s1) || strlen (s1) >= 4) \
&& (!__string2_1bptr_p (s2) || strlen (s2) >= 4) \
? memcmp (s1, s2, (strlen (s1) < strlen (s2) \
? strlen (s1) : strlen (s2)) + 1) \
: (__builtin_constant_p (s1) && __string2_1bptr_p (s1) \
&& __string2_1bptr_p (s2) && strlen (s1) < 4 \
? (__builtin_constant_p (s2) \
? __strcmp_cc (s1, s2, strlen (s1)) \
: __strcmp_cg (s1, s2, strlen (s1))) \
: (__builtin_constant_p (s2) && __string2_1bptr_p (s1) \
&& __string2_1bptr_p (s2) && strlen (s2) < 4 \
? (__builtin_constant_p (s1) \
? __strcmp_cc (s1, s2, strlen (s2)) \
: __strcmp_gc (s1, s2, strlen (s2))) \
: strcmp (s1, s2)))))
# define __strcmp_cc(s1, s2, l) \
(__extension__ ({ register int __result = \
(((__const unsigned char *) (s1))[0] \
- ((__const unsigned char *) (s2))[0]); \
if (l > 0 && __result == 0) \
{ \
__result = (((__const unsigned char *) (s1))[1] \
- ((__const unsigned char *) (s2))[1]); \
if (l > 1 && __result == 0) \
{ \
__result = \
(((__const unsigned char *) (s1))[2] \
- ((__const unsigned char *) (s2))[2]); \
if (l > 2 && __result == 0) \
__result = \
(((__const unsigned char *) (s1))[3] \
- ((__const unsigned char *) (s2))[3]); \
} \
} \
__result; }))
# define __strcmp_cg(s1, s2, l1) \
(__extension__ ({ __const unsigned char *__s2 = \
(__const unsigned char *) (s2); \
register int __result = \
(((__const unsigned char *) (s1))[0] - __s2[0]); \
if (l1 > 0 && __result == 0) \
{ \
__result = (((__const unsigned char *) (s1))[1] \
- __s2[1]); \
if (l1 > 1 && __result == 0) \
{ \
__result = (((__const unsigned char *) (s1))[2] \
- __s2[2]); \
if (l1 > 2 && __result == 0) \
__result = (((__const unsigned char *) (s1))[3] \
- __s2[3]); \
} \
} \
__result; }))
# define __strcmp_gc(s1, s2, l2) \
(__extension__ ({ __const unsigned char *__s1 = \
(__const unsigned char *) (s1); \
register int __result = \
__s1[0] - ((__const unsigned char *) (s2))[0]; \
if (l2 > 0 && __result == 0) \
{ \
__result = (__s1[1] \
- ((__const unsigned char *) (s2))[1]); \
if (l2 > 1 && __result == 0) \
{ \
__result = \
(__s1[2] - ((__const unsigned char *) (s2))[2]);\
if (l2 > 2 && __result == 0) \
__result = \
(__s1[3] \
- ((__const unsigned char *)(s2))[3]); \
} \
} \
__result; }))
#endif
/* Compare N characters of S1 and S2. */
#ifndef _HAVE_STRING_ARCH_strncmp
# define strncmp(s1, s2, n) \
(__extension__ (__builtin_constant_p (s1) && strlen (s1) < ((size_t) (n)) \
? strcmp (s1, s2) \
: (__builtin_constant_p (s2) && strlen (s2) < ((size_t) (n))\
? strcmp (s1, s2) \
: strncmp (s1, s2, n))))
#endif
/* Return the length of the initial segment of S which
consists entirely of characters not in REJECT. */
#ifndef _HAVE_STRING_ARCH_strcspn
# define strcspn(s, reject) \
(__extension__ (__builtin_constant_p (reject) && __string2_1bptr_p (reject) \
? (((__const unsigned char *) (reject))[0] == '\0' \
? strlen (s) \
: (((__const unsigned char *) (reject))[1] == '\0' \
? __strcspn_c1 (s, ((__const char *) (reject))[0]) \
: strcspn (s, reject))) \
: strcspn (s, reject)))
__STRING_INLINE size_t __strcspn_c1 (__const char *__s, char __reject);
__STRING_INLINE size_t
__strcspn_c1 (__const char *__s, char __reject)
{
register size_t __result = 0;
while (__s[__result] != '\0' && __s[__result] != __reject)
++__result;
return __result;
}
#endif
/* Return the length of the initial segment of S which
consists entirely of characters in ACCEPT. */
#ifndef _HAVE_STRING_ARCH_strspn
# define strspn(s, accept) \
(__extension__ (__builtin_constant_p (accept) && __string2_1bptr_p (accept) \
? (((__const unsigned char *) (accept))[0] == '\0' \
? 0 \
: (((__const unsigned char *) (accept))[1] == '\0' \
? __strspn_c1 (s, ((__const char *) (accept))[0]) \
: strspn (s, accept))) \
: strspn (s, accept)))
__STRING_INLINE size_t __strspn_c1 (__const char *__s, char __accept);
__STRING_INLINE size_t
__strspn_c1 (__const char *__s, char __accept)
{
register size_t __result = 0;
/* Please note that __accept never can be '\0'. */
while (__s[__result] == __accept)
++__result;
return __result;
}
#endif
/* Find the first occurrence in S of any character in ACCEPT. */
#ifndef _HAVE_STRING_ARCH_strpbrk
# define strpbrk(s, accept) \
(__extension__ (__builtin_constant_p (accept) && __string2_1bptr_p (accept) \
? (((__const unsigned char *) (accept))[0] == '\0' \
? NULL \
: (((__const unsigned char *) (accept))[1] == '\0' \
? strchr (s, ((__const unsigned char *) (accept))[0]) \
: strpbrk (s, accept))) \
: strpbrk (s, accept)))
#endif
/* Find the first occurrence of NEEDLE in HAYSTACK. */
#ifndef _HAVE_STRING_ARCH_strstr
# define strstr(haystack, needle) \
(__extension__ (__builtin_constant_p (needle) && __string2_1bptr_p (needle) \
? (((__const unsigned char *) (needle))[0] == '\0' \
? haystack \
: (((__const unsigned char *) (needle))[1] == '\0' \
? strchr (haystack, \
((__const unsigned char *) (needle))[0]) \
: strstr (haystack, needle))) \
: strstr (haystack, needle)))
#endif
#ifdef __USE_GNU
# ifndef _HAVE_STRING_ARCH_strnlen
__STRING_INLINE size_t strnlen (__const char *__string, size_t __maxlen);
__STRING_INLINE size_t
strnlen (__const char *__string, size_t __maxlen)
{
__const char *__end = (__const char *) memchr (__string, '\0', __maxlen);
return __end ? __end - __string : __maxlen;
}
# endif
#endif
#ifdef __USE_BSD
# ifndef _HAVE_STRING_ARCH_strsep
# define strsep(s, reject) \
(__extension__ (__builtin_constant_p (reject) && __string2_1bptr_p (reject) \
? (((__const unsigned char *) (reject))[0] != '\0' \
&& ((__const unsigned char *) (reject))[1] == '\0' \
? __strsep_1c (s, \
((__const unsigned char *) (reject))[0]) \
: __strsep_g (s, reject)) \
: __strsep_g (s, reject)))
__STRING_INLINE char *__strsep_1c (char **__s, char __reject);
__STRING_INLINE char *
__strsep_1c (char **__s, char __reject)
{
register char *__retval = *__s;
if (__retval == NULL || *__retval == '\0')
return NULL;
while (*__retval == __reject)
++__retval;
if ((*__s = strchr (__retval, __reject)) != NULL)
*(*__s)++ = '\0';
return __retval;
}
__STRING_INLINE char *__strsep_g (char **__s, __const char *__reject);
__STRING_INLINE char *
__strsep_g (char **__s, __const char *__reject)
{
register char *__retval = *__s;
if (__retval == NULL || *__retval == '\0')
return NULL;
if ((*__s = strpbrk (__retval, __reject)) != NULL)
*(*__s)++ = '\0';
return __retval;
}
# endif
#endif
#undef __STRING_INLINE
#endif /* No string inlines. */
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