mirror of
https://gitee.com/acl-dev/acl.git
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296 lines
9.7 KiB
C
296 lines
9.7 KiB
C
/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* There may be prolems include all of theese. Try to test in
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configure with ones are needed? */
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/* This is needed for the definitions of strchr... on solaris */
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#ifndef _m_string_h
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#define _m_string_h
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#include "my_global.h" /* HAVE_* */
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#ifndef __USE_GNU
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#define __USE_GNU /* We want to use stpcpy */
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#endif
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#if defined(HAVE_STRINGS_H)
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#include <strings.h>
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#endif
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#if defined(HAVE_STRING_H)
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#include <string.h>
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#endif
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/* need by my_vsnprintf */
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#include <stdarg.h>
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/* This is needed for the definitions of bzero... on solaris */
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#if defined(HAVE_STRINGS_H)
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#include <strings.h>
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#endif
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/* This is needed for the definitions of memcpy... on solaris */
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#if defined(HAVE_MEMORY_H) && !defined(__cplusplus)
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#include <memory.h>
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#endif
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#if !defined(HAVE_MEMCPY) && !defined(HAVE_MEMMOVE)
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# define memcpy(d, s, n) bcopy ((s), (d), (n))
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# define memset(A,C,B) bfill((A),(B),(C))
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# define memmove(d, s, n) bmove ((d), (s), (n))
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#elif defined(HAVE_MEMMOVE)
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# define bmove(d, s, n) memmove((d), (s), (n))
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#endif
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/* Unixware 7 */
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#if !defined(HAVE_BFILL)
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# define bfill(A,B,C) memset((A),(C),(B))
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#endif
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#if !defined(bzero) && !defined(HAVE_BZERO)
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# define bzero(A,B) memset((A),0,(B))
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#endif
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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my_str_malloc() and my_str_free() are assigned to implementations in
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strings/alloc.c, but can be overridden in the calling program.
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*/
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extern void *(*my_str_malloc)(size_t);
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extern void (*my_str_free)(void *);
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#if defined(HAVE_STPCPY) && MY_GNUC_PREREQ(3, 4) && !defined(__INTEL_COMPILER)
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#define strmov(A,B) __builtin_stpcpy((A),(B))
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#elif defined(HAVE_STPCPY)
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#define strmov(A,B) stpcpy((A),(B))
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#ifndef stpcpy
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extern char *stpcpy(char *, const char *); /* For AIX with gcc 2.95.3 */
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#endif
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#endif
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/* Declared in int2str() */
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extern char _dig_vec_upper[];
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extern char _dig_vec_lower[];
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#ifndef strmov
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#define strmov_overlapp(A,B) strmov(A,B)
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#define strmake_overlapp(A,B,C) strmake(A,B,C)
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#endif
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/* Prototypes for string functions */
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extern void bmove_upp(uchar *dst,const uchar *src,size_t len);
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extern void bchange(uchar *dst,size_t old_len,const uchar *src,
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size_t new_len,size_t tot_len);
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extern void strappend(char *s,size_t len,pchar fill);
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extern char *strend(const char *s);
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extern char *strcend(const char *, pchar);
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extern char *strfill(char * s,size_t len,pchar fill);
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extern char *strmake(char *dst,const char *src,size_t length);
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#ifndef strmov
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extern char *strmov(char *dst,const char *src);
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#else
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extern char *strmov_overlapp(char *dst,const char *src);
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#endif
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extern char *strnmov(char *dst, const char *src, size_t n);
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extern char *strcont(const char *src, const char *set);
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extern char *strxmov(char *dst, const char *src, ...);
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extern char *strxnmov(char *dst, size_t len, const char *src, ...);
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/* Prototypes of normal stringfunctions (with may ours) */
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#ifndef HAVE_STRNLEN
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extern size_t strnlen(const char *s, size_t n);
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#endif
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extern int is_prefix(const char *, const char *);
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/* Conversion routines */
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typedef enum {
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MY_GCVT_ARG_FLOAT,
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MY_GCVT_ARG_DOUBLE
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} my_gcvt_arg_type;
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double my_strtod(const char *str, char **end, int *error);
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double my_atof(const char *nptr);
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size_t my_fcvt(double x, int precision, char *to, my_bool *error);
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size_t my_gcvt(double x, my_gcvt_arg_type type, int width, char *to,
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my_bool *error);
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#define NOT_FIXED_DEC 31
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/*
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The longest string my_fcvt can return is 311 + "precision" bytes.
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Here we assume that we never cal my_fcvt() with precision >= NOT_FIXED_DEC
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(+ 1 byte for the terminating '\0').
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*/
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#define FLOATING_POINT_BUFFER (311 + NOT_FIXED_DEC)
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/*
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We want to use the 'e' format in some cases even if we have enough space
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for the 'f' one just to mimic sprintf("%.15g") behavior for large integers,
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and to improve it for numbers < 10^(-4).
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That is, for |x| < 1 we require |x| >= 10^(-15), and for |x| > 1 we require
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it to be integer and be <= 10^DBL_DIG for the 'f' format to be used.
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We don't lose precision, but make cases like "1e200" or "0.00001" look nicer.
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*/
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#define MAX_DECPT_FOR_F_FORMAT DBL_DIG
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/*
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The maximum possible field width for my_gcvt() conversion.
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(DBL_DIG + 2) significant digits + sign + "." + ("e-NNN" or
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MAX_DECPT_FOR_F_FORMAT zeros for cases when |x|<1 and the 'f' format is used).
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*/
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#define MY_GCVT_MAX_FIELD_WIDTH (DBL_DIG + 4 + max(5, MAX_DECPT_FOR_F_FORMAT)) \
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extern char *llstr(longlong value,char *buff);
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extern char *ullstr(longlong value,char *buff);
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#ifndef HAVE_STRTOUL
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extern long strtol(const char *str, char **ptr, int base);
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extern ulong strtoul(const char *str, char **ptr, int base);
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#endif
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extern char *int2str(long val, char *dst, int radix, int upcase);
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extern char *int10_to_str(long val,char *dst,int radix);
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extern char *str2int(const char *src,int radix,long lower,long upper,
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long *val);
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longlong my_strtoll10(const char *nptr, char **endptr, int *error);
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#if SIZEOF_LONG == SIZEOF_LONG_LONG
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#define ll2str(A,B,C,D) int2str((A),(B),(C),(D))
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#define longlong10_to_str(A,B,C) int10_to_str((A),(B),(C))
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#undef strtoll
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#define strtoll(A,B,C) strtol((A),(B),(C))
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#define strtoull(A,B,C) strtoul((A),(B),(C))
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#ifndef HAVE_STRTOULL
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#define HAVE_STRTOULL
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#endif
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#ifndef HAVE_STRTOLL
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#define HAVE_STRTOLL
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#endif
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#else
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#ifdef HAVE_LONG_LONG
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extern char *ll2str(longlong val,char *dst,int radix, int upcase);
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extern char *longlong10_to_str(longlong val,char *dst,int radix);
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#if (!defined(HAVE_STRTOULL) || defined(NO_STRTOLL_PROTO))
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extern longlong strtoll(const char *str, char **ptr, int base);
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extern ulonglong strtoull(const char *str, char **ptr, int base);
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#endif
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#endif
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#endif
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#define longlong2str(A,B,C) ll2str((A),(B),(C),1)
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#if defined(__cplusplus)
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}
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#endif
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/*
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LEX_STRING -- a pair of a C-string and its length.
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(it's part of the plugin API as a MYSQL_LEX_STRING)
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*/
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#include <mysql/plugin.h>
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typedef struct st_mysql_lex_string LEX_STRING;
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#define STRING_WITH_LEN(X) (X), ((size_t) (sizeof(X) - 1))
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#define USTRING_WITH_LEN(X) ((uchar*) X), ((size_t) (sizeof(X) - 1))
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#define C_STRING_WITH_LEN(X) ((char *) (X)), ((size_t) (sizeof(X) - 1))
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struct st_mysql_const_lex_string
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{
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const char *str;
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size_t length;
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};
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typedef struct st_mysql_const_lex_string LEX_CSTRING;
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/* SPACE_INT is a word that contains only spaces */
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#if SIZEOF_INT == 4
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#define SPACE_INT 0x20202020
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#elif SIZEOF_INT == 8
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#define SPACE_INT 0x2020202020202020
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#else
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#error define the appropriate constant for a word full of spaces
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#endif
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/**
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Skip trailing space.
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On most systems reading memory in larger chunks (ideally equal to the size of
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the chinks that the machine physically reads from memory) causes fewer memory
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access loops and hence increased performance.
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This is why the 'int' type is used : it's closest to that (according to how
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it's defined in C).
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So when we determine the amount of whitespace at the end of a string we do
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the following :
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1. We divide the string into 3 zones :
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a) from the start of the string (__start) to the first multiple
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of sizeof(int) (__start_words)
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b) from the end of the string (__end) to the last multiple of sizeof(int)
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(__end_words)
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c) a zone that is aligned to sizeof(int) and can be safely accessed
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through an int *
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2. We start comparing backwards from (c) char-by-char. If all we find is
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space then we continue
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3. If there are elements in zone (b) we compare them as unsigned ints to a
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int mask (SPACE_INT) consisting of all spaces
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4. Finally we compare the remaining part (a) of the string char by char.
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This covers for the last non-space unsigned int from 3. (if any)
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This algorithm works well for relatively larger strings, but it will slow
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the things down for smaller strings (because of the additional calculations
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and checks compared to the naive method). Thus the barrier of length 20
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is added.
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@param ptr pointer to the input string
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@param len the length of the string
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@return the last non-space character
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*/
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static inline const uchar *skip_trailing_space(const uchar *ptr,size_t len)
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{
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const uchar *end= ptr + len;
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if (len > 20)
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{
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const uchar *end_words= (const uchar *)(intptr)
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(((ulonglong)(intptr)end) / SIZEOF_INT * SIZEOF_INT);
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const uchar *start_words= (const uchar *)(intptr)
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((((ulonglong)(intptr)ptr) + SIZEOF_INT - 1) / SIZEOF_INT * SIZEOF_INT);
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DBUG_ASSERT(((ulonglong)(intptr)ptr) >= SIZEOF_INT);
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if (end_words > ptr)
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{
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while (end > end_words && end[-1] == 0x20)
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end--;
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if (end[-1] == 0x20 && start_words < end_words)
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while (end > start_words && ((unsigned *)end)[-1] == SPACE_INT)
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end -= SIZEOF_INT;
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}
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}
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while (end > ptr && end[-1] == 0x20)
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end--;
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return (end);
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}
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static inline void lex_string_set(LEX_STRING *lex_str, const char *c_str)
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{
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lex_str->str= (char *) c_str;
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lex_str->length= strlen(c_str);
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}
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#endif
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