>Number:         6072
>Category:       lib
>Synopsis:       stdio documentation bug
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    lib-bug-people (Library Bug People)
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 30 16:20:09 1998
>Last-Modified:
>Originator:     Andreas Gustafsson
>Organization:
Araneus Information Systems Oy
>Release:        1.3.2
>Environment:

System: NetBSD guava.araneus.fi 1.3.2 NetBSD 1.3.2 (GUAVA) #2: Wed Aug 5 09:44:51 EEST 1998 root@guava.araneus.fi:/z/src-1.3/sys/arch/i386/compile/GUAVA i386


>Description:

The fopen(3) man page states:

     Reads and writes may be intermixed on read/write streams in any order,
     and do not require an intermediate seek as in previous versions of stdio.

This claim is incorrect.

>How-To-Repeat:

Run the following test program and examine the contents of the
resulting file.

  #include <err.h>
  #include <stdio.h>

  int main(int argc, char **argv)
  {
      FILE *fp;
      int i;
      /* Make a file containing 16384 spaces */
      fp = fopen("test.fil", "w");
      if (!fp) err(1, "fopen");
      for (i = 0; i < 16384; i++)
	  putc(' ', fp);
      fclose(fp);

      /*
	Reopen the file, read the first two characters and then 
	attempt to replace the third one with an "X".  
      */
      fp = fopen("test.fil", "r+");
      if (!fp) err(1, "fopen");
      getc(fp);
      getc(fp);
      putc('X', fp);
      fclose(fp);
  }

  /* Now examine the file and notice the third character is not an "X". */

>Fix:

Remove the paragraph containing the quoted text from the man page.
>Audit-Trail:
>Unformatted: