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/*
** PJL C++ Library
** itoa.c
**
** Copyright (C) 1998 Paul J. Lucas
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
// local
#include "itoa.h"
#include "platform.h"
#include "util.h" /* for char_buffer_pool<> */
#ifndef PJL_NO_NAMESPACES
using namespace std;
namespace PJL {
#endif
//*****************************************************************************
//
// SYNOPSIS
//
char const* ltoa( register long n )
//
// DESCRIPTION
//
// Convert a long integer to a string. The string returned is from an
// internal pool of string buffers. The time you get into trouble is if
// you hang on to more then Num_Buffers strings. This doesn't normally
// happen in practice, however.
//
// PARAMETERS
//
// n The long integer to be converted.
//
// RETURN VALUE
//
// A pointer to the string.
//
// CAVEAT
//
// This function is NOT thread-safe because it uses char_buffer_pool which
// isn't.
//
// SEE ALSO
//
// Brian W. Kernighan, Dennis M. Ritchie. "The C Programming Language,
// 2nd ed." Addison-Wesley, Reading, MA, 1988. pp. 63-64.
//
//*****************************************************************************
{
static char_buffer_pool<25,5> buf;
register char *s = buf.next();
bool const is_neg = n < 0;
if ( is_neg ) n = -n;
do { // generate digits in reverse
*s++ = n % 10 + '0';
} while ( n /= 10 );
if ( is_neg ) *s++ = '-';
*s = '\0';
// now reverse the string
for ( register char *t = buf.current(); t < s; ++t ) {
char const tmp = *--s; *s = *t; *t = tmp;
}
return buf.current();
}
#ifndef PJL_NO_NAMESPACES
}
#endif
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