Import changeset

client/sql_string.h

@@ -0,0 +1,183 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This 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.
+   
+   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 interface			/* gcc class implementation */
+#endif
+
+#ifndef NOT_FIXED_DEC
+#define NOT_FIXED_DEC			31
+#endif
+
+class String
+{
+  char *Ptr;
+  uint32 str_length,Alloced_length;
+  bool alloced;
+public:
+  String()
+  { Ptr=0; str_length=Alloced_length=0; alloced=0; }
+  String(uint32 length_arg)
+  { alloced=0; Alloced_length=0; (void) real_alloc(length_arg); }
+  String(const char *str)
+  { Ptr=(char*) str; str_length=strlen(str); Alloced_length=0; alloced=0;}
+  String(const char *str,uint32 len)
+  { Ptr=(char*) str; str_length=len; Alloced_length=0; alloced=0;}
+  String(char *str,uint32 len)
+  { Ptr=(char*) str; Alloced_length=str_length=len; alloced=0;}
+  String(const String &str)
+  { Ptr=str.Ptr ; str_length=str.str_length ;
+    Alloced_length=str.Alloced_length; alloced=0; }
+
+  static void *operator new(size_t size) { return (void*) sql_alloc(size); }
+  static void operator delete(void *ptr_arg,size_t size) /*lint -e715 */
+    { sql_element_free(ptr_arg); }
+  ~String() { free(); }
+
+  inline uint32 length() const { return str_length;}
+  inline uint32 alloced_length() const { return Alloced_length;}
+  inline char& operator [] (uint32 i) const { return Ptr[i]; }
+  inline void length(uint32 len) { str_length=len ; }
+  inline bool is_empty() { return (str_length == 0); }
+  inline const char *ptr() const { return Ptr; }
+  inline char *c_ptr()
+  {
+    if (!Ptr || Ptr[str_length])		/* Should be safe */
+      (void) realloc(str_length);
+    return Ptr;
+  }
+  inline char *c_ptr_quick()
+  {
+    if (Ptr && str_length < Alloced_length)
+      Ptr[str_length]=0;
+    return Ptr;
+  }
+
+  void set(String &str,uint32 offset,uint32 arg_length)
+  {
+    free();
+    Ptr=(char*) str.ptr()+offset; str_length=arg_length; alloced=0;
+    if (str.Alloced_length)
+      Alloced_length=str.Alloced_length-offset;
+    else
+      Alloced_length=0;
+  }
+  inline void set(char *str,uint32 arg_length)
+  {
+    free();
+    Ptr=(char*) str; str_length=Alloced_length=arg_length ; alloced=0;
+  }
+  inline void set(const char *str,uint32 arg_length)
+  {
+    free();
+    Ptr=(char*) str; str_length=arg_length; Alloced_length=0 ; alloced=0;
+  }
+  inline void set_quick(char *str,uint32 arg_length)
+  {
+    if (!alloced)
+    {
+      Ptr=(char*) str; str_length=Alloced_length=arg_length;
+    }
+  }
+  bool set(longlong num);
+  /* bool set(long num); */
+  bool set(ulonglong num);
+  bool set(double num,uint decimals=2);
+  inline void free()
+    {
+      if (alloced)
+      {
+	alloced=0;
+	Alloced_length=0;
+	my_free(Ptr,MYF(0));
+	Ptr=0;
+      }
+    }
+
+  inline bool alloc(uint32 arg_length)
+  {
+    if (arg_length < Alloced_length)
+      return 0;
+    return real_alloc(arg_length);
+  }
+  bool real_alloc(uint32 arg_length);			// Empties old string
+  bool realloc(uint32 arg_length);
+  inline void shrink(uint32 arg_length)		// Shrink buffer
+  {
+    if (arg_length < Alloced_length)
+    {
+      char *new_ptr;
+      if (!(new_ptr=my_realloc(Ptr,arg_length,MYF(0))))
+      {
+	(void) my_free(Ptr,MYF(0));
+	real_alloc(arg_length);
+      }
+      else
+      {
+	Ptr=new_ptr;
+	Alloced_length=arg_length;
+      }
+    }
+  }
+  bool is_alloced() { return alloced; }
+  inline String& operator = (const String &s)
+  {
+    if (&s != this)
+    {
+      free();
+      Ptr=s.Ptr ; str_length=s.str_length ; Alloced_length=s.Alloced_length;
+      alloced=0;
+    }
+    return *this;
+  }
+
+  bool copy();					// Alloc string if not alloced
+  bool copy(const String &s);			// Allocate new string
+  bool copy(const char *s,uint32 arg_length);	// Allocate new string
+  bool append(const String &s);
+  bool append(const char *s,uint32 arg_length=0);
+  int strstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
+  int strrstr(const String &search,uint32 offset=0); // Returns offset to substring or -1
+  bool replace(uint32 offset,uint32 arg_length,const String &to);
+  inline bool append(char chr)
+  {
+    if (str_length < Alloced_length)
+    {
+      Ptr[str_length++]=chr;
+    }
+    else
+    {
+      if (realloc(str_length+1))
+	return 1;
+      Ptr[str_length++]=chr;
+    }
+    return 0;
+  }
+  bool fill(uint32 max_length,char fill);
+  void strip_sp();
+  inline void caseup() { ::caseup(Ptr,str_length); }
+  inline void casedn() { ::casedn(Ptr,str_length); }
+  friend int sortcmp(const String *a,const String *b);
+  friend int stringcmp(const String *a,const String *b);
+  friend String *copy_if_not_alloced(String *a,String *b,uint32 arg_length);
+  friend int wild_case_compare(String &match,String &wild,char escape);
+  friend int wild_compare(String &match,String &wild,char escape);
+  uint32 numchars();
+  int charpos(int i,uint32 offset=0);
+};