lib/anytostr.c

   1 /* anytostr.c -- convert integers to printable strings
   2
   3    Copyright (C) 2001, 2006, 2008-2025 Free Software Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert */
  19
  20 #include <config.h>
  21
  22 #include "inttostr.h"
  23
  24 /* Convert I to a printable string in BUF, which must be at least
  25    INT_BUFSIZE_BOUND (INTTYPE) bytes long.  Return the address of the
  26    printable string, which need not start at BUF.  */
  27
  28 _GL_ATTRIBUTE_NODISCARD char *
  29 anytostr (inttype i, char *buf)
  30 {
  31   char *p = buf + INT_STRLEN_BOUND (inttype);
  32   *p = 0;
  33
  34   if (i < 0)
  35     {
  36       do
  37         *--p = '0' - i % 10;
  38       while ((i /= 10) != 0);
  39
  40       *--p = '-';
  41     }
  42   else
  43     {
  44       do
  45         *--p = '0' + i % 10;
  46       while ((i /= 10) != 0);
  47     }
  48
  49   return p;
  50 }