compiler/clib/fopen.c

   1 /*
   2     Copyright © 1995-2003, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     ANSI C function fopen().
   6 */
   7
   8 #include <fcntl.h>
   9 #include "__stdio.h"
  10
  11
  12 /*****************************************************************************
  13
  14     NAME */
  15 #include <stdio.h>
  16
  17         FILE * fopen (
  18
  19 /*  SYNOPSIS */
  20         const char * pathname,
  21         const char * mode)
  22
  23 /*  FUNCTION
  24         Opens a file with the specified name in the specified mode.
  25
  26     INPUTS
  27         pathname - Path and filename of the file you want to open.
  28         mode - How to open the file:
  29
  30                 r: Open for reading. The stream is positioned at the
  31                         beginning of the file.
  32
  33                 r+: Open for reading and writing. The stream is positioned
  34                         at the beginning of the file.
  35
  36                 w: Open for writing. If the file doesn't exist, then
  37                         it is created. If it does already exist, then
  38                         it is truncated. The stream is positioned at the
  39                         beginning of the file.
  40
  41                 w+: Open for reading and writing. If the file doesn't
  42                         exist, then it is created. If it does already
  43                         exist, then it is truncated. The stream is
  44                         positioned at the beginning of the file.
  45
  46                 a: Open for writing. If the file doesn't exist, then
  47                         it is created. The stream is positioned at the
  48                         end of the file.
  49
  50                 a+: Open for reading and writing. If the file doesn't
  51                         exist, then it is created. The stream is positioned
  52                         at the end of the file.
  53
  54                 b: Open in binary more. This has no effect and is ignored.
  55
  56     RESULT
  57         A pointer to a FILE handle or NULL in case of an error. When NULL
  58         is returned, then errno is set to indicate the error.
  59
  60     NOTES
  61         This function must not be used in a shared library or
  62         in a threaded application.
  63
  64     EXAMPLE
  65
  66     BUGS
  67         Most modes are not supported right now.
  68
  69     SEE ALSO
  70         fclose(), fread(), fwrite(), open(), fgets(), fgetc(),
  71         fputs(), fputc(), getc(), putc()
  72
  73     INTERNALS
  74
  75 ******************************************************************************/
  76 {
  77     int fd;
  78     int openmode = __smode2oflags(mode);
  79
  80     if (openmode != -1)
  81     {
  82         fd = open(pathname, openmode, 644);
  83         if (fd == -1)
  84             return NULL;
  85
  86         return fdopen(fd, NULL);
  87     }
  88     else
  89     {
  90         return NULL;
  91     }
  92 } /* fopen */
  93