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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [libgloss/] [or32/] [read.c] - Blame information for rev 829

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/* read.c. Implementation of the _read syscall for newlib
 
   Copyright (C) 2004, Jacob Bower
   Copyright (C) 2010, Embecosm Limited <info@embecosm.com>
 
   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>
 
   This file is part of Newlib.
 
   The original work by Jacob Bower is provided as-is without any kind of
   warranty. Use it at your own risk!
 
   All subsequent work is bound by version 3 of the GPL as follows.
 
   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3 of the License, or (at your option)
   any later version.
 
   This program is distributed in the hope that it will be useful, but WITHOUT
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.
 
   You should have received a copy of the GNU General Public License along
   with this program.  If not, see <http:#www.gnu.org/licenses/>.             */
/* -------------------------------------------------------------------------- */
/* This program is commented throughout in a fashion suitable for processing
   with Doxygen.                                                              */
/* -------------------------------------------------------------------------- */
 
#include <errno.h>
#include <unistd.h>
 
#include "or1k-support.h"
 
#undef errno
extern int  errno;
 
 
/* -------------------------------------------------------------------------- */
/*!Read from a file.
 
   Depending on board support, we may attempt to read from UART.
 
   Remember that this function is *not* reentrant, so no static state should
   be held.
 
   @param[in] file  The fileno to read.
   @param[in] buf   Buffer into which to read.
   @param[in] len   Number of bytes to read.
 
   @return  0 to indicate EOF if the file is stdin, otherwise -1 to indicate
            failure, with an error code in the global variable errno.         */
/* -------------------------------------------------------------------------- */
int
_read (int   file,
       char *buf,
       int   len)
{
        if (STDIN_FILENO == file)
        {
 
                if (BOARD_HAS_UART)
                {
                        /* UART supported. Read from it */
 
 
                        int  i;
 
                        for (i = 0; i < len; i++)
                        {
                                buf[i] = __uart_getc ();
#ifdef UART_AUTO_ECHO
                                __uart_putc (buf[i]);
#endif
                                /* Return partial buffer if we get EOL */
                                if ('\n' == buf[i])
                                {
                                        return  i;
                                }
                        }
 
                        return  i;                      /* Filled the buffer */
                }
                else
                {
                        return  0;                       /* EOF */
                }
        }
        else
        {
                errno = EBADF;
                return  -1;
        }
}       /* _read () */

Line No.	Rev	Author	Line
1	207	jeremybenn	`/* read.c. Implementation of the _read syscall for newlib`
2
3			`Copyright (C) 2004, Jacob Bower`
4			`Copyright (C) 2010, Embecosm Limited <info@embecosm.com>`
5
6			`Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>`
7
8			`This file is part of Newlib.`
9
10			`The original work by Jacob Bower is provided as-is without any kind of`
11			`warranty. Use it at your own risk!`
12
13			`All subsequent work is bound by version 3 of the GPL as follows.`
14
15			`This program is free software; you can redistribute it and/or modify it`
16			`under the terms of the GNU General Public License as published by the Free`
17			`Software Foundation; either version 3 of the License, or (at your option)`
18			`any later version.`
19
20			`This program is distributed in the hope that it will be useful, but WITHOUT`
21			`ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or`
22			`FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for`
23			`more details.`
24
25			`You should have received a copy of the GNU General Public License along`
26			`with this program. If not, see <http:#www.gnu.org/licenses/>. */`
27			`/* -------------------------------------------------------------------------- */`
28			`/* This program is commented throughout in a fashion suitable for processing`
29			`with Doxygen. */`
30			`/* -------------------------------------------------------------------------- */`
31
32			`#include <errno.h>`
33			`#include <unistd.h>`
34
35	527	julius	`#include "or1k-support.h"`
36	207	jeremybenn
37			`#undef errno`
38			`extern int errno;`
39
40
41			`/* -------------------------------------------------------------------------- */`
42			`/*!Read from a file.`
43
44	507	julius	`Depending on board support, we may attempt to read from UART.`
45	207	jeremybenn
46			`Remember that this function is not reentrant, so no static state should`
47			`be held.`
48
49			`@param[in] file The fileno to read.`
50	507	julius	`@param[in] buf Buffer into which to read.`
51	207	jeremybenn	`@param[in] len Number of bytes to read.`
52
53			`@return 0 to indicate EOF if the file is stdin, otherwise -1 to indicate`
54			`failure, with an error code in the global variable errno. */`
55			`/* -------------------------------------------------------------------------- */`
56			`int`
57			`_read (int file,`
58	507	julius	`char *buf,`
59	207	jeremybenn	`int len)`
60			`{`
61	507	julius	`if (STDIN_FILENO == file)`
62			`{`
63
64			`if (BOARD_HAS_UART)`
65			`{`
66			`/* UART supported. Read from it */`
67
68
69			`int i;`
70
71			`for (i = 0; i < len; i++)`
72			`{`
73			`buf[i] = __uart_getc ();`
74			`#ifdef UART_AUTO_ECHO`
75			`__uart_putc (buf[i]);`
76			`#endif`
77			`/* Return partial buffer if we get EOL */`
78			`if ('\n' == buf[i])`
79			`{`
80			`return i;`
81			`}`
82			`}`
83
84			`return i; /* Filled the buffer */`
85			`}`
86			`else`
87			`{`
88			`return 0; /* EOF */`
89			`}`
90			`}`
91			`else`
92			`{`
93			`errno = EBADF;`
94			`return -1;`
95			`}`
96	207	jeremybenn	`} /* _read () */`

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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [libgloss/] [or32/] [read.c] - Blame information for rev 829