compiler/stdc/tmpfile.c

   1 /*
   2     Copyright © 2010-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function tmpfile().
   6     This function is based on the public domain libnix code
   7 */
   8 #include "__stdio.h"
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <stdio.h>
  14
  15         FILE * tmpfile(
  16
  17 /*  SYNOPSIS */
  18         void)
  19
  20 /*  FUNCTION
  21         The tmpfile() function creates a temporary file that is different from
  22         any other existing file and that will automatically be removed when
  23         it is closed or at program termination. The file is opened for update
  24         with "wb+" mode.
  25
  26     INPUTS
  27
  28
  29     RESULT
  30         Pointer to the stream that was created. On error NULL is returned.
  31
  32     NOTES
  33         This function uses tmpnam(NULL) to get the file name.
  34
  35     EXAMPLE
  36         #include <errno.h>
  37         #include <stdio.h>
  38         #include <string.h>
  39
  40         main()
  41         {
  42           FILE * fp;
  43
  44           fp = tmpfile();
  45           if ( fp == NULL)
  46           {
  47             perror(strerror(errno));
  48             return;
  49           }
  50
  51           fprintf(fp, "do a bit of writing to the temp file");
  52         }
  53
  54     BUGS
  55
  56     SEE ALSO
  57         fopen(), tmpnam()
  58
  59     INTERNALS
  60
  61 ******************************************************************************/
  62 {
  63     char *s;
  64     FILE *f = NULL;
  65
  66     do {
  67         s = tmpnam(NULL);
  68
  69         if (s == NULL)
  70             return NULL;
  71
  72         f = fopen(s, "wb+");
  73     } while (f == NULL);
  74
  75     f->flags |= __STDCIO_STDIO_TMP;
  76
  77     return f;
  78 } /* tmpfile() */