Import changeset

1 files changed, 155 insertions, 0 deletions

diff --git a/strings/int2str.c b/strings/int2str.c
new file mode 100644
index 00000000000..4003e8a6167
--- /dev/null
+++ b/strings/int2str.c
@@ -0,0 +1,155 @@
+/* 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 */
+
+/*
+  Defines: int2str(), itoa(), ltoa()
+
+  int2str(dst, radix, val)
+  converts the (long) integer "val" to character form and moves it to
+  the destination string "dst" followed by a terminating NUL.  The
+  result is normally a pointer to this NUL character, but if the radix
+  is dud the result will be NullS and nothing will be changed.
+
+  If radix is -2..-36, val is taken to be SIGNED.
+  If radix is  2.. 36, val is taken to be UNSIGNED.
+  That is, val is signed if and only if radix is.  You will normally
+  use radix -10 only through itoa and ltoa, for radix 2, 8, or 16
+  unsigned is what you generally want.
+
+  _dig_vec is public just in case someone has a use for it.
+  The definitions of itoa and ltoa are actually macros in m_string.h,
+  but this is where the code is.
+
+  Note: The standard itoa() returns a pointer to the argument, when int2str
+	returns the pointer to the end-null.
+	itoa assumes that 10 -base numbers are allways signed and other arn't.
+*/
+
+#include <global.h>
+#include "m_string.h"
+
+char NEAR _dig_vec[] =
+  "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+
+char *int2str(register long int val, register char *dst, register int radix)
+{
+  char buffer[65];
+  register char *p;
+  long int new_val;
+
+  if (radix < 0) {
+    if (radix < -36 || radix > -2) return NullS;
+    if (val < 0) {
+      *dst++ = '-';
+      val = -val;
+    }
+    radix = -radix;
+  } else {
+    if (radix > 36 || radix < 2) return NullS;
+  }
+  /*  The slightly contorted code which follows is due to the
+      fact that few machines directly support unsigned long / and %.
+      Certainly the VAX C compiler generates a subroutine call.  In
+      the interests of efficiency (hollow laugh) I let this happen
+      for the first digit only; after that "val" will be in range so
+      that signed integer division will do.  Sorry 'bout that.
+      CHECK THE CODE PRODUCED BY YOUR C COMPILER.  The first % and /
+      should be unsigned, the second % and / signed, but C compilers
+      tend to be extraordinarily sensitive to minor details of style.
+      This works on a VAX, that's all I claim for it.
+      */
+  p = &buffer[sizeof(buffer)-1];
+  *p = '\0';
+  new_val=(ulong) val / (ulong) radix;
+  *--p = _dig_vec[(uchar) ((ulong) val- (ulong) new_val*(ulong) radix)];
+  val = new_val;
+#ifdef HAVE_LDIV
+  while (val != 0)
+  {
+    ldiv_t res;
+    res=ldiv(val,radix);
+    *--p = _dig_vec[res.rem];
+    val= res.quot;
+  }
+#else
+  while (val != 0)
+  {
+    new_val=val/radix;
+    *--p = _dig_vec[(uchar) (val-new_val*radix)];
+    val= new_val;
+  }
+#endif
+  while ((*dst++ = *p++) != 0) ;
+  return dst-1;
+}
+
+
+/*
+  This is a faster version of the above optimized for the normal case of
+   radix 10 / -10
+*/
+
+char *int10_to_str(long int val,char *dst,int radix)
+{
+  char buffer[65];
+  register char *p;
+  long int new_val;
+
+  if (radix < 0)				/* -10 */
+  {
+    if (val < 0)
+    {
+      *dst++ = '-';
+      val = -val;
+    }
+  }
+
+  p = &buffer[sizeof(buffer)-1];
+  *p = '\0';
+  new_val= (long) ((unsigned long int) val / 10);
+  *--p = '0'+ (char) ((unsigned long int) val - (unsigned long) new_val * 10);
+  val = new_val;
+
+  while (val != 0)
+  {
+    new_val=val/10;
+    *--p = '0' + (char) (val-new_val*10);
+    val= new_val;
+  }
+  while ((*dst++ = *p++) != 0) ;
+  return dst-1;
+}
+
+
+#ifdef USE_MY_ITOA
+
+	/* Change to less general itoa interface */
+
+char *my_itoa(int val, char *dst, int radix)
+{
+  VOID(int2str((long) val,dst,(radix == 10 ? -10 : radix)));
+  return dst;
+}
+
+char *my_ltoa(long int val, char *dst, int radix)
+{
+  VOID(int2str((long) val,dst,(radix == 10 ? -10 : radix)));
+  return dst;
+}
+
+#endif