sql_string.cc
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:17k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-
- This program file 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.
-
- This 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 this library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- MA 02111-1307, USA */
- /* This file is originally from the mysql distribution. Coded by monty */
- #ifdef __GNUC__
- #pragma implementation // gcc: Class implementation
- #endif
- #include <global.h>
- #include <my_sys.h>
- #include <m_string.h>
- #include <m_ctype.h>
- #ifdef HAVE_FCONVERT
- #include <floatingpoint.h>
- #endif
- extern gptr sql_alloc(unsigned size);
- extern void sql_element_free(void *ptr);
- #include "sql_string.h"
- /*****************************************************************************
- ** String functions
- *****************************************************************************/
- bool String::real_alloc(uint32 arg_length)
- {
- arg_length=ALIGN_SIZE(arg_length+1);
- if (Alloced_length < arg_length)
- {
- free();
- if (!(Ptr=(char*) my_malloc(arg_length,MYF(MY_WME))))
- {
- str_length=0;
- return TRUE;
- }
- Alloced_length=arg_length;
- alloced=1;
- }
- Ptr[0]=0;
- str_length=0;
- return FALSE;
- }
- /*
- ** Check that string is big enough. Set string[alloc_length] to 0
- ** (for C functions)
- */
- bool String::realloc(uint32 alloc_length)
- {
- uint32 len=ALIGN_SIZE(alloc_length+1);
- if (Alloced_length < len)
- {
- char *new_ptr;
- if (alloced)
- {
- if ((new_ptr= (char*) my_realloc(Ptr,len,MYF(MY_WME))))
- {
- Ptr=new_ptr;
- Alloced_length=len;
- }
- else
- return TRUE; // Signal error
- }
- else if ((new_ptr= (char*) my_malloc(len,MYF(MY_WME))))
- {
- if (str_length) // Avoid bugs in memcpy on AIX
- memcpy(new_ptr,Ptr,str_length);
- new_ptr[str_length]=0;
- Ptr=new_ptr;
- Alloced_length=len;
- alloced=1;
- }
- else
- return TRUE; // Signal error
- }
- Ptr[alloc_length]=0; // This make other funcs shorter
- return FALSE;
- }
- bool String::set(longlong num)
- {
- if (alloc(21))
- return TRUE;
- str_length=(uint32) (longlong10_to_str(num,Ptr,-10)-Ptr);
- return FALSE;
- }
- bool String::set(ulonglong num)
- {
- if (alloc(21))
- return TRUE;
- str_length=(uint32) (longlong10_to_str(num,Ptr,10)-Ptr);
- return FALSE;
- }
- bool String::set(double num,uint decimals)
- {
- char buff[331];
- if (decimals >= NOT_FIXED_DEC)
- {
- sprintf(buff,"%.14g",num); // Enough for a DATETIME
- return copy(buff, (uint32) strlen(buff));
- }
- #ifdef HAVE_FCONVERT
- int decpt,sign;
- char *pos,*to;
- VOID(fconvert(num,(int) decimals,&decpt,&sign,buff+1));
- if (!isdigit(buff[1]))
- { // Nan or Inf
- pos=buff+1;
- if (sign)
- {
- buff[0]='-';
- pos=buff;
- }
- return copy(pos,(uint32) strlen(pos));
- }
- if (alloc((uint32) ((uint32) decpt+3+decimals)))
- return TRUE;
- to=Ptr;
- if (sign)
- *to++='-';
- pos=buff+1;
- if (decpt < 0)
- { /* value is < 0 */
- *to++='0';
- if (!decimals)
- goto end;
- *to++='.';
- if ((uint32) -decpt > decimals)
- decpt= - (int) decimals;
- decimals=(uint32) ((int) decimals+decpt);
- while (decpt++ < 0)
- *to++='0';
- }
- else if (decpt == 0)
- {
- *to++= '0';
- if (!decimals)
- goto end;
- *to++='.';
- }
- else
- {
- while (decpt-- > 0)
- *to++= *pos++;
- if (!decimals)
- goto end;
- *to++='.';
- }
- while (decimals--)
- *to++= *pos++;
- end:
- *to=0;
- str_length=(uint32) (to-Ptr);
- return FALSE;
- #else
- #ifdef HAVE_SNPRINTF
- buff[sizeof(buff)-1]=0; // Safety
- snprintf(buff,sizeof(buff)-1, "%.*f",(int) decimals,num);
- #else
- sprintf(buff,"%.*f",(int) decimals,num);
- #endif
- return copy(buff,(uint32) strlen(buff));
- #endif
- }
- bool String::copy()
- {
- if (!alloced)
- {
- Alloced_length=0; // Force realloc
- return realloc(str_length);
- }
- return FALSE;
- }
- bool String::copy(const String &str)
- {
- if (alloc(str.str_length))
- return TRUE;
- str_length=str.str_length;
- bmove(Ptr,str.Ptr,str_length); // May be overlapping
- Ptr[str_length]=0;
- return FALSE;
- }
- bool String::copy(const char *str,uint32 arg_length)
- {
- if (alloc(arg_length))
- return TRUE;
- if ((str_length=arg_length))
- memcpy(Ptr,str,arg_length);
- Ptr[arg_length]=0;
- return FALSE;
- }
- /* This is used by mysql.cc */
- bool String::fill(uint32 max_length,char fill_char)
- {
- if (str_length > max_length)
- Ptr[str_length=max_length]=0;
- else
- {
- if (realloc(max_length))
- return TRUE;
- bfill(Ptr+str_length,max_length-str_length,fill_char);
- str_length=max_length;
- }
- return FALSE;
- }
- void String::strip_sp()
- {
- while (str_length && isspace(Ptr[str_length-1]))
- str_length--;
- }
- bool String::append(const String &s)
- {
- if (s.length())
- {
- if (realloc(str_length+s.length()))
- return TRUE;
- memcpy(Ptr+str_length,s.ptr(),s.length());
- str_length+=s.length();
- }
- return FALSE;
- }
- bool String::append(const char *s,uint32 arg_length)
- {
- if (!arg_length) // Default argument
- if (!(arg_length= (uint32) strlen(s)))
- return FALSE;
- if (realloc(str_length+arg_length))
- return TRUE;
- memcpy(Ptr+str_length,s,arg_length);
- str_length+=arg_length;
- return FALSE;
- }
- #ifdef TO_BE_REMOVED
- bool String::append(FILE* file, uint32 arg_length, myf my_flags)
- {
- if (realloc(str_length+arg_length))
- return TRUE;
- if (my_fread(file, (byte*) Ptr + str_length, arg_length, my_flags))
- {
- shrink(str_length);
- return TRUE;
- }
- str_length+=arg_length;
- return FALSE;
- }
- #endif
- bool String::append(IO_CACHE* file, uint32 arg_length)
- {
- if (realloc(str_length+arg_length))
- return TRUE;
- if (my_b_read(file, (byte*) Ptr + str_length, arg_length))
- {
- shrink(str_length);
- return TRUE;
- }
- str_length+=arg_length;
- return FALSE;
- }
- uint32 String::numchars()
- {
- #ifdef USE_MB
- register uint32 n=0,mblen;
- register const char *mbstr=Ptr;
- register const char *end=mbstr+str_length;
- if (use_mb(default_charset_info))
- {
- while (mbstr < end) {
- if ((mblen=my_ismbchar(default_charset_info, mbstr,end))) mbstr+=mblen;
- else ++mbstr;
- ++n;
- }
- return n;
- }
- else
- #endif
- return str_length;
- }
- int String::charpos(int i,uint32 offset)
- {
- #ifdef USE_MB
- register uint32 mblen;
- register const char *mbstr=Ptr+offset;
- register const char *end=Ptr+str_length;
- if (use_mb(default_charset_info))
- {
- if (i<=0) return i;
- while (i && mbstr < end) {
- if ((mblen=my_ismbchar(default_charset_info, mbstr,end))) mbstr+=mblen;
- else ++mbstr;
- --i;
- }
- if ( INT_MAX32-i <= (int) (mbstr-Ptr-offset))
- return INT_MAX32;
- else
- return (int) ((mbstr-Ptr-offset)+i);
- }
- else
- #endif
- return i;
- }
- int String::strstr(const String &s,uint32 offset)
- {
- if (s.length()+offset <= str_length)
- {
- if (!s.length())
- return ((int) offset); // Empty string is always found
- register const char *str = Ptr+offset;
- register const char *search=s.ptr();
- const char *end=Ptr+str_length-s.length()+1;
- const char *search_end=s.ptr()+s.length();
- skipp:
- while (str != end)
- {
- if (*str++ == *search)
- {
- register char *i,*j;
- i=(char*) str; j=(char*) search+1;
- while (j != search_end)
- if (*i++ != *j++) goto skipp;
- return (int) (str-Ptr) -1;
- }
- }
- }
- return -1;
- }
- /*
- ** Search string from end. Offset is offset to the end of string
- */
- int String::strrstr(const String &s,uint32 offset)
- {
- if (s.length() <= offset && offset <= str_length)
- {
- if (!s.length())
- return offset; // Empty string is always found
- register const char *str = Ptr+offset-1;
- register const char *search=s.ptr()+s.length()-1;
- const char *end=Ptr+s.length()-2;
- const char *search_end=s.ptr()-1;
- skipp:
- while (str != end)
- {
- if (*str-- == *search)
- {
- register char *i,*j;
- i=(char*) str; j=(char*) search-1;
- while (j != search_end)
- if (*i-- != *j--) goto skipp;
- return (int) (i-Ptr) +1;
- }
- }
- }
- return -1;
- }
- /*
- ** replace substring with string
- ** If wrong parameter or not enough memory, do nothing
- */
- bool String::replace(uint32 offset,uint32 arg_length,const String &to)
- {
- long diff = (long) to.length()-(long) arg_length;
- if (offset+arg_length <= str_length)
- {
- if (diff < 0)
- {
- if (to.length())
- memcpy(Ptr+offset,to.ptr(),to.length());
- bmove(Ptr+offset+to.length(),Ptr+offset+arg_length,
- str_length-offset-arg_length);
- }
- else
- {
- if (diff)
- {
- if (realloc(str_length+(uint32) diff))
- return TRUE;
- bmove_upp(Ptr+str_length+diff,Ptr+str_length,
- str_length-offset-arg_length);
- }
- if (to.length())
- memcpy(Ptr+offset,to.ptr(),to.length());
- }
- str_length+=(uint32) diff;
- }
- return FALSE;
- }
- int sortcmp(const String *x,const String *y)
- {
- const char *s= x->ptr();
- const char *t= y->ptr();
- uint32 x_len=x->length(),y_len=y->length(),len=min(x_len,y_len);
- #ifdef USE_STRCOLL
- if (use_strcoll(default_charset_info))
- {
- #ifndef CMP_ENDSPACE
- while (x_len && isspace(s[x_len-1]))
- x_len--;
- while (y_len && isspace(t[y_len-1]))
- y_len--;
- #endif
- return my_strnncoll(default_charset_info,
- (unsigned char *)s,x_len,(unsigned char *)t,y_len);
- }
- else
- {
- #endif /* USE_STRCOLL */
- x_len-=len; // For easy end space test
- y_len-=len;
- while (len--)
- {
- if (my_sort_order[(uchar) *s++] != my_sort_order[(uchar) *t++])
- return ((int) my_sort_order[(uchar) s[-1]] -
- (int) my_sort_order[(uchar) t[-1]]);
- }
- #ifndef CMP_ENDSPACE
- /* Don't compare end space in strings */
- {
- if (y_len)
- {
- const char *end=t+y_len;
- for (; t != end ; t++)
- if (!isspace(*t))
- return -1;
- }
- else
- {
- const char *end=s+x_len;
- for (; s != end ; s++)
- if (!isspace(*s))
- return 1;
- }
- return 0;
- }
- #else
- return (int) (x_len-y_len);
- #endif /* CMP_ENDSPACE */
- #ifdef USE_STRCOLL
- }
- #endif
- }
- int stringcmp(const String *x,const String *y)
- {
- const char *s= x->ptr();
- const char *t= y->ptr();
- uint32 x_len=x->length(),y_len=y->length(),len=min(x_len,y_len);
- while (len--)
- {
- if (*s++ != *t++)
- return ((int) (uchar) s[-1] - (int) (uchar) t[-1]);
- }
- return (int) (x_len-y_len);
- }
- String *copy_if_not_alloced(String *to,String *from,uint32 from_length)
- {
- if (from->Alloced_length >= from_length)
- return from;
- if (from->alloced || !to || from == to)
- {
- (void) from->realloc(from_length);
- return from;
- }
- if (to->realloc(from_length))
- return from; // Actually an error
- if ((to->str_length=min(from->str_length,from_length)))
- memcpy(to->Ptr,from->Ptr,to->str_length);
- return to;
- }
- /* Make it easier to handle different charactersets */
- #ifdef USE_MB
- #define INC_PTR(A,B) A+=((use_mb_flag &&
- my_ismbchar(default_charset_info,A,B)) ?
- my_ismbchar(default_charset_info,A,B) : 1)
- #else
- #define INC_PTR(A,B) A++
- #endif
- /*
- ** Compare string against string with wildcard
- ** 0 if matched
- ** -1 if not matched with wildcard
- ** 1 if matched with wildcard
- */
- #ifdef LIKE_CMP_TOUPPER
- #define likeconv(A) (uchar) toupper(A)
- #else
- #define likeconv(A) (uchar) my_sort_order[(uchar) (A)]
- #endif
- int wild_case_compare(const char *str,const char *str_end,
- const char *wildstr,const char *wildend,
- char escape)
- {
- int result= -1; // Not found, using wildcards
- #ifdef USE_MB
- bool use_mb_flag=use_mb(default_charset_info);
- #endif
- while (wildstr != wildend)
- {
- while (*wildstr != wild_many && *wildstr != wild_one)
- {
- if (*wildstr == escape && wildstr+1 != wildend)
- wildstr++;
- #ifdef USE_MB
- int l;
- if (use_mb_flag &&
- (l = my_ismbchar(default_charset_info, wildstr, wildend)))
- {
- if (str+l > str_end || memcmp(str, wildstr, l) != 0)
- return 1;
- str += l;
- wildstr += l;
- }
- else
- #endif
- if (str == str_end || likeconv(*wildstr++) != likeconv(*str++))
- return(1); // No match
- if (wildstr == wildend)
- return (str != str_end); // Match if both are at end
- result=1; // Found an anchor char
- }
- if (*wildstr == wild_one)
- {
- do
- {
- if (str == str_end) // Skipp one char if possible
- return (result);
- INC_PTR(str,str_end);
- } while (++wildstr < wildend && *wildstr == wild_one);
- if (wildstr == wildend)
- break;
- }
- if (*wildstr == wild_many)
- { // Found wild_many
- wildstr++;
- /* Remove any '%' and '_' from the wild search string */
- for ( ; wildstr != wildend ; wildstr++)
- {
- if (*wildstr == wild_many)
- continue;
- if (*wildstr == wild_one)
- {
- if (str == str_end)
- return (-1);
- INC_PTR(str,str_end);
- continue;
- }
- break; // Not a wild character
- }
- if (wildstr == wildend)
- return(0); // Ok if wild_many is last
- if (str == str_end)
- return -1;
- uchar cmp;
- if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
- cmp= *++wildstr;
- #ifdef USE_MB
- const char* mb = wildstr;
- int mblen;
- LINT_INIT(mblen);
- if (use_mb_flag)
- mblen = my_ismbchar(default_charset_info, wildstr, wildend);
- #endif
- INC_PTR(wildstr,wildend); // This is compared trough cmp
- cmp=likeconv(cmp);
- do
- {
- #ifdef USE_MB
- if (use_mb_flag)
- {
- for (;;)
- {
- if (str >= str_end)
- return -1;
- if (mblen)
- {
- if (str+mblen <= str_end && memcmp(str, mb, mblen) == 0)
- {
- str += mblen;
- break;
- }
- }
- else if (!my_ismbchar(default_charset_info, str, str_end) &&
- likeconv(*str) == cmp)
- {
- str++;
- break;
- }
- INC_PTR(str, str_end);
- }
- }
- else
- {
- #endif /* USE_MB */
- while (str != str_end && likeconv(*str) != cmp)
- str++;
- if (str++ == str_end) return (-1);
- #ifdef USE_MB
- }
- #endif
- {
- int tmp=wild_case_compare(str,str_end,wildstr,wildend,escape);
- if (tmp <= 0)
- return (tmp);
- }
- } while (str != str_end && wildstr[0] != wild_many);
- return(-1);
- }
- }
- return (str != str_end ? 1 : 0);
- }
- int wild_case_compare(String &match,String &wild, char escape)
- {
- return wild_case_compare(match.ptr(),match.ptr()+match.length(),
- wild.ptr(), wild.ptr()+wild.length(),escape);
- }
- /*
- ** The following is used when using LIKE on binary strings
- */
- int wild_compare(const char *str,const char *str_end,
- const char *wildstr,const char *wildend,char escape)
- {
- int result= -1; // Not found, using wildcards
- while (wildstr != wildend)
- {
- while (*wildstr != wild_many && *wildstr != wild_one)
- {
- if (*wildstr == escape && wildstr+1 != wildend)
- wildstr++;
- if (str == str_end || *wildstr++ != *str++)
- return(1);
- if (wildstr == wildend)
- return (str != str_end); // Match if both are at end
- result=1; // Found an anchor char
- }
- if (*wildstr == wild_one)
- {
- do
- {
- if (str == str_end) // Skipp one char if possible
- return (result);
- str++;
- } while (*++wildstr == wild_one && wildstr != wildend);
- if (wildstr == wildend)
- break;
- }
- if (*wildstr == wild_many)
- { // Found wild_many
- wildstr++;
- /* Remove any '%' and '_' from the wild search string */
- for ( ; wildstr != wildend ; wildstr++)
- {
- if (*wildstr == wild_many)
- continue;
- if (*wildstr == wild_one)
- {
- if (str == str_end)
- return (-1);
- str++;
- continue;
- }
- break; // Not a wild character
- }
- if (wildstr == wildend)
- return(0); // Ok if wild_many is last
- if (str == str_end)
- return -1;
- char cmp;
- if ((cmp= *wildstr) == escape && wildstr+1 != wildend)
- cmp= *++wildstr;
- wildstr++; // This is compared trough cmp
- do
- {
- while (str != str_end && *str != cmp)
- str++;
- if (str++ == str_end) return (-1);
- {
- int tmp=wild_compare(str,str_end,wildstr,wildend,escape);
- if (tmp <= 0)
- return (tmp);
- }
- } while (str != str_end && wildstr[0] != wild_many);
- return(-1);
- }
- }
- return (str != str_end ? 1 : 0);
- }
- int wild_compare(String &match,String &wild, char escape)
- {
- return wild_compare(match.ptr(),match.ptr()+match.length(),
- wild.ptr(), wild.ptr()+wild.length(),escape);
- }