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Diffstat (limited to 'REORG.TODO/string/bits/string2.h')
| -rw-r--r-- | REORG.TODO/string/bits/string2.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/REORG.TODO/string/bits/string2.h b/REORG.TODO/string/bits/string2.h new file mode 100644 index 0000000000..6a26e2bc68 --- /dev/null +++ b/REORG.TODO/string/bits/string2.h @@ -0,0 +1,119 @@ +/* Machine-independant string function optimizations. + Copyright (C) 1997-2017 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#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 optimized down to assembler + level. Those 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 do not dramatically + increase the code size and which do not use assembler. The main + trick is to use GCC'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 latter. */ + +#ifndef __STRING_INLINE +# ifdef __cplusplus +# define __STRING_INLINE inline +# else +# define __STRING_INLINE __extern_inline +# endif +#endif + +/* Dereferencing a pointer arg to run sizeof on it fails for the void + pointer case, so we use this instead. + Note that __x is evaluated twice. */ +#define __string2_1bptr_p(__x) \ + ((size_t)(const void *)((__x) + 1) - (size_t)(const void *)(__x) == 1) + +/* Set N bytes of S to 0. */ +#if !defined _HAVE_STRING_ARCH_memset +# define __bzero(s, n) __builtin_memset (s, '\0', n) +#endif + + +/* Copy SRC to DEST, returning pointer to final NUL byte. */ +#ifdef __USE_GNU +# ifndef _HAVE_STRING_ARCH_stpcpy +# define __stpcpy(dest, src) __builtin_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) +# endif +#endif + + +/* Copy no more than N characters of SRC to DEST. */ +#ifndef _HAVE_STRING_ARCH_strncpy +# define strncpy(dest, src, n) __builtin_strncpy (dest, src, n) +#endif + + +/* Append no more than N characters from SRC onto DEST. */ +#ifndef _HAVE_STRING_ARCH_strncat +# ifdef _USE_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) \ + : (*((char *) __mempcpy (strchr (__dest, '\0'), \ + src, n)) = '\0', __dest)) \ + : strncat (dest, src, n); })) +# else +# define strncat(dest, src, n) __builtin_strncat (dest, src, n) +# endif +#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) __builtin_strcspn (s, reject) +#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) __builtin_strspn (s, accept) +#endif + + +/* Find the first occurrence in S of any character in ACCEPT. */ +#ifndef _HAVE_STRING_ARCH_strpbrk +# define strpbrk(s, accept) __builtin_strpbrk (s, accept) +#endif + + +#ifndef _FORCE_INLINES +# undef __STRING_INLINE +#endif + +#endif /* No string inlines. */ |