xref: /freebsd-10.3-release/contrib/groff/src/libs/libgroff/itoa.c

/* Copyright (C) 1989, 1990, 1991, 1992, 2000, 2002, 2004
     Free Software Foundation, Inc.
     Written by James Clark (jjc@jclark.com)

This file is part of groff.

groff 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, or (at your option) any later
version.

groff 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 groff; see the file COPYING.  If not, write to the Free Software
Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */

#define INT_DIGITS 19		/* enough for 64 bit integer */
#define UINT_DIGITS 20

#ifdef __cplusplus
extern "C" {
#endif

char *i_to_a(int i)
{
  /* Room for INT_DIGITS digits, - and '\0' */
  static char buf[INT_DIGITS + 2];
  char *p = buf + INT_DIGITS + 1;	/* points to terminating '\0' */
  if (i >= 0) {
    do {
      *--p = '0' + (i % 10);
      i /= 10;
    } while (i != 0);
    return p;
  }
  else {			/* i < 0 */
    do {
      *--p = '0' - (i % 10);
      i /= 10;
    } while (i != 0);
    *--p = '-';
  }
  return p;
}

char *ui_to_a(unsigned int i)
{
  /* Room for UINT_DIGITS digits and '\0' */
  static char buf[UINT_DIGITS + 1];
  char *p = buf + UINT_DIGITS;	/* points to terminating '\0' */
  do {
    *--p = '0' + (i % 10);
    i /= 10;
  } while (i != 0);
  return p;
}

#ifdef __cplusplus
}
#endif