libiberty/spaces.c

   1 /* Allocate memory region filled with spaces.
   2    Copyright (C) 1991-2017 Free Software Foundation, Inc.
   3
   4 This file is part of the libiberty library.
   5 Libiberty is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public
   7 License as published by the Free Software Foundation; either
   8 version 2 of the License, or (at your option) any later version.
   9
  10 Libiberty 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 GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with libiberty; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
  18 Boston, MA 02110-1301, USA.  */
  19
  20 /*
  21
  22 @deftypefn Extension char* spaces (int @var{count})
  23
  24 Returns a pointer to a memory region filled with the specified
  25 number of spaces and null terminated.  The returned pointer is
  26 valid until at least the next call.
  27
  28 @end deftypefn
  29
  30 */
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35 #include "ansidecl.h"
  36 #include "libiberty.h"
  37
  38 #if VMS
  39 #include <stdlib.h>
  40 #include <unixlib.h>
  41 #else
  42 /* For systems with larger pointers than ints, these must be declared.  */
  43 extern PTR malloc (size_t);
  44 extern void free (PTR);
  45 #endif
  46
  47 const char *
  48 spaces (int count)
  49 {
  50   register char *t;
  51   static char *buf;
  52   static int maxsize;
  53
  54   if (count > maxsize)
  55     {
  56       free (buf);
  57       buf = (char *) malloc (count + 1);
  58       if (buf == (char *) 0)
  59         return 0;
  60       for (t = buf + count ; t != buf ; )
  61         {
  62           *--t = ' ';
  63         }
  64       maxsize = count;
  65       buf[count] = '\0';
  66     }
  67   return (const char *) (buf + maxsize - count);
  68 }
  69