compiler/posixc/fgets.c

   1 /*
   2     Copyright © 1995-2013, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function fgets().
   6 */
   7
   8 #include <errno.h>
   9 #include <string.h>
  10 #include <dos/dos.h>
  11 #include <dos/dosextens.h>
  12 #include <proto/exec.h>
  13 #include <proto/dos.h>
  14 #include "__fdesc.h"
  15 #include "__stdio.h"
  16
  17 /*****************************************************************************
  18
  19     NAME */
  20 #include <stdio.h>
  21
  22     char * fgets (
  23
  24 /*  SYNOPSIS */
  25     char * buffer,
  26     int    size,
  27     FILE * stream)
  28
  29 /*  FUNCTION
  30         Read one line of characters from the stream into the buffer.
  31         Reading will stop, when a newline ('\n') is encountered, EOF
  32         or when the buffer is full. If a newline is read, then it is
  33         put into the buffer. The last character in the buffer is always
  34         '\0' (Therefore at most size-1 characters can be read in one go).
  35
  36     INPUTS
  37         buffer - Write characters into this buffer
  38         size - This is the size of the buffer in characters.
  39         stream - Read from this stream
  40
  41     RESULT
  42         buffer or NULL in case of an error or EOF.
  43
  44     NOTES
  45
  46     EXAMPLE
  47         // Read a file line by line
  48         char line[256];
  49
  50         // Read until EOF
  51         while (fgets (line, sizeof (line), fh))
  52         {
  53             // Evaluate the line
  54         }
  55
  56     BUGS
  57
  58     SEE ALSO
  59         fopen(), gets(), fputs()
  60
  61     INTERNALS
  62
  63 ******************************************************************************/
  64 {
  65     fdesc *fdesc = __getfdesc(stream->fd);
  66
  67     if (!fdesc)
  68     {
  69         errno = EBADF;
  70         stream->flags |= __POSIXC_STDIO_ERROR;
  71
  72         return NULL;
  73     }
  74
  75     FLUSHONREADCHECK
  76
  77     buffer = FGets (fdesc->fcb->handle, buffer, size);
  78
  79     if (!buffer)
  80     {
  81         if (IoErr ())
  82         {
  83             errno = __stdc_ioerr2errno(IoErr());
  84             stream->flags |= __POSIXC_STDIO_ERROR;
  85             }
  86         else
  87         {
  88             stream->flags |= __POSIXC_STDIO_EOF;
  89         }
  90     }
  91     else
  92     {
  93         int bsize = strlen(buffer);
  94         if ((bsize + 1 < size) && (buffer[bsize - 1] != '\n'))
  95             stream->flags |= __POSIXC_STDIO_EOF;
  96     }
  97
  98     return buffer;
  99 } /* fgets */
 100