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glibc  2.9
iopadn.c
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00001 /* Copyright (C) 1993, 1997, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.
00018 
00019    As a special exception, if you link the code in this file with
00020    files compiled with a GNU compiler to produce an executable,
00021    that does not cause the resulting executable to be covered by
00022    the GNU Lesser General Public License.  This exception does not
00023    however invalidate any other reasons why the executable file
00024    might be covered by the GNU Lesser General Public License.
00025    This exception applies to code released by its copyright holders
00026    in files containing the exception.  */
00027 
00028 #include "libioP.h"
00029 
00030 #define PADSIZE 16
00031 static char const blanks[PADSIZE] =
00032 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
00033 static char const zeroes[PADSIZE] =
00034 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
00035 
00036 _IO_ssize_t
00037 _IO_padn (fp, pad, count)
00038       _IO_FILE *fp;
00039       int pad;
00040       _IO_ssize_t count;
00041 {
00042   char padbuf[PADSIZE];
00043   const char *padptr;
00044   int i;
00045   _IO_size_t written = 0;
00046   _IO_size_t w;
00047 
00048   if (pad == ' ')
00049     padptr = blanks;
00050   else if (pad == '0')
00051     padptr = zeroes;
00052   else
00053     {
00054       for (i = PADSIZE; --i >= 0; )
00055        padbuf[i] = pad;
00056       padptr = padbuf;
00057     }
00058   for (i = count; i >= PADSIZE; i -= PADSIZE)
00059     {
00060       w = _IO_sputn (fp, padptr, PADSIZE);
00061       written += w;
00062       if (w != PADSIZE)
00063        return written;
00064     }
00065 
00066   if (i > 0)
00067     {
00068       w = _IO_sputn (fp, padptr, i);
00069       written += w;
00070     }
00071   return written;
00072 }
00073 INTDEF(_IO_padn)