sql_string.cpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:14k
- /* Copyright (C) 2000 MySQL AB
- 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* This file is originally from the mysql distribution. Coded by monty */
- #ifdef USE_PRAGMA_IMPLEMENTATION
- #pragma implementation // gcc: Class implementation
- #endif
- #include <my_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);
- str_length=0;
- if (Alloced_length < arg_length)
- {
- free();
- if (!(Ptr=(char*) my_malloc(arg_length,MYF(MY_WME))))
- return TRUE;
- Alloced_length=arg_length;
- alloced=1;
- }
- Ptr[0]=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, CHARSET_INFO *cs)
- {
- uint l=20*cs->mbmaxlen+1;
- if (alloc(l))
- return TRUE;
- if (cs->cset->snprintf == my_snprintf_8bit)
- {
- str_length=(uint32) (longlong10_to_str(num,Ptr,-10)-Ptr);
- }
- else
- {
- str_length=cs->cset->snprintf(cs,Ptr,l,"%d",num);
- }
- str_charset=cs;
- return FALSE;
- }
- bool String::set(ulonglong num, CHARSET_INFO *cs)
- {
- uint l=20*cs->mbmaxlen+1;
- if (alloc(l))
- return TRUE;
- if (cs->cset->snprintf == my_snprintf_8bit)
- {
- str_length=(uint32) (longlong10_to_str(num,Ptr,10)-Ptr);
- }
- else
- {
- str_length=cs->cset->snprintf(cs,Ptr,l,"%d",num);
- }
- str_charset=cs;
- return FALSE;
- }
- bool String::set(double num,uint decimals, CHARSET_INFO *cs)
- {
- char buff[331];
- str_charset=cs;
- if (decimals >= NOT_FIXED_DEC)
- {
- sprintf(buff,"%.14g",num); // Enough for a DATETIME
- return copy(buff, (uint32) strlen(buff), &my_charset_latin1, cs);
- }
- #ifdef HAVE_FCONVERT
- int decpt,sign;
- char *pos,*to;
- VOID(fconvert(num,(int) decimals,&decpt,&sign,buff+1));
- if (!my_isdigit(&my_charset_latin1, buff[1]))
- { // Nan or Inf
- pos=buff+1;
- if (sign)
- {
- buff[0]='-';
- pos=buff;
- }
- return copy(pos,(uint32) strlen(pos), &my_charset_latin1, cs);
- }
- 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), &my_charset_latin1, cs);
- #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;
- str_charset=str.str_charset;
- return FALSE;
- }
- bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *cs)
- {
- if (alloc(arg_length))
- return TRUE;
- if ((str_length=arg_length))
- memcpy(Ptr,str,arg_length);
- Ptr[arg_length]=0;
- str_charset=cs;
- return FALSE;
- }
- /* Copy with charset convertion */
- bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *from, CHARSET_INFO *to)
- {
- uint32 new_length=to->mbmaxlen*arg_length;
- int cnvres;
- my_wc_t wc;
- const uchar *s=(const uchar *)str;
- const uchar *se=s+arg_length;
- uchar *d, *de;
- if (alloc(new_length))
- return TRUE;
- d=(uchar *)Ptr;
- de=d+new_length;
-
- for (str_length=new_length ; s < se && d < de ; )
- {
- if ((cnvres=from->cset->mb_wc(from,&wc,s,se)) > 0 )
- {
- s+=cnvres;
- }
- else if (cnvres==MY_CS_ILSEQ)
- {
- s++;
- wc='?';
- }
- else
- break;
- outp:
- if((cnvres=to->cset->wc_mb(to,wc,d,de)) >0 )
- {
- d+=cnvres;
- }
- else if (cnvres==MY_CS_ILUNI && wc!='?')
- {
- wc='?';
- goto outp;
- }
- else
- break;
- }
- Ptr[new_length]=0;
- length((uint32) (d-(uchar *)Ptr));
- str_charset=to;
- 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 && my_isspace(str_charset,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(str_charset))
- {
- while (mbstr < end) {
- if ((mblen=my_ismbchar(str_charset, 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(str_charset))
- {
- if (i<=0) return i;
- while (i && mbstr < end) {
- if ((mblen=my_ismbchar(str_charset, 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();
- skip:
- 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 skip;
- return (int) (str-Ptr) -1;
- }
- }
- }
- return -1;
- }
- /*
- Search after a string without regarding to case
- This needs to be replaced when we have character sets per string
- */
- int String::strstr_case(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();
- skip:
- while (str != end)
- {
- if (str_charset->sort_order[*str++] == str_charset->sort_order[*search])
- {
- register char *i,*j;
- i=(char*) str; j=(char*) search+1;
- while (j != search_end)
- if (str_charset->sort_order[*i++] !=
- str_charset->sort_order[*j++])
- goto skip;
- 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;
- skip:
- 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 skip;
- 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;
- }
- // added by Holyfoot for "geometry" needs
- int String::reserve(uint32 space_needed, uint32 grow_by)
- {
- if (Alloced_length < str_length + space_needed)
- {
- if (realloc(Alloced_length + max(space_needed, grow_by) - 1))
- return TRUE;
- }
- return FALSE;
- }
- void String::qs_append(const char *str)
- {
- int len = (int)strlen(str);
- memcpy(Ptr + str_length, str, len + 1);
- str_length += len;
- }
- void String::qs_append(double d)
- {
- char *buff = Ptr + str_length;
- sprintf(buff,"%.14g", d);
- str_length += (int)strlen(buff);
- }
- void String::qs_append(double *d)
- {
- double ld;
- float8get(ld, (char*) d);
- qs_append(ld);
- }
- void String::qs_append(const char &c)
- {
- Ptr[str_length] = c;
- str_length += sizeof(c);
- }
- 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);
- if (use_strnxfrm(x->str_charset))
- {
- #ifndef CMP_ENDSPACE
- while (x_len && my_isspace(x->str_charset,s[x_len-1]))
- x_len--;
- while (y_len && my_isspace(x->str_charset,t[y_len-1]))
- y_len--;
- #endif
- return my_strnncoll(x->str_charset,
- (unsigned char *)s,x_len,(unsigned char *)t,y_len);
- }
- else
- {
- x_len-=len; // For easy end space test
- y_len-=len;
- if (x->str_charset->sort_order)
- {
- while (len--)
- {
- if (x->str_charset->sort_order[(uchar) *s++] !=
- x->str_charset->sort_order[(uchar) *t++])
- return ((int) x->str_charset->sort_order[(uchar) s[-1]] -
- (int) x->str_charset->sort_order[(uchar) t[-1]]);
- }
- }
- else
- {
- while (len--)
- {
- if (*s++ != *t++)
- return ((int) s[-1] - (int) 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 (!my_isspace(x->str_charset,*t))
- return -1;
- }
- else
- {
- const char *end=s+x_len;
- for (; s != end ; s++)
- if (!my_isspace(x->str_charset,*s))
- return 1;
- }
- return 0;
- }
- #else
- return (int) (x_len-y_len);
- #endif /* CMP_ENDSPACE */
- }
- }
- 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);
- to->str_charset=from->str_charset;
- return to;
- }