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Line 30... |
/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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#include <errno.h>
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#include <errno.h>
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#include <unistd.h>
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#include <unistd.h>
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#include "or1k-support.h"
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#undef errno
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#undef errno
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extern int errno;
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extern int errno;
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/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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/*!Read from a file.
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/*!Read from a file.
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We don't support reading. However for stdin, it's better if we return 0
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Depending on board support, we may attempt to read from UART.
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(indicating EOF) rather than fail.
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Remember that this function is *not* reentrant, so no static state should
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Remember that this function is *not* reentrant, so no static state should
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be held.
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be held.
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@param[in] file The fileno to read.
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@param[in] file The fileno to read.
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@param[in] ptr Buffer into which to read.
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@param[in] buf Buffer into which to read.
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@param[in] len Number of bytes to read.
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@param[in] len Number of bytes to read.
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@return 0 to indicate EOF if the file is stdin, otherwise -1 to indicate
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@return 0 to indicate EOF if the file is stdin, otherwise -1 to indicate
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failure, with an error code in the global variable errno. */
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failure, with an error code in the global variable errno. */
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/* -------------------------------------------------------------------------- */
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/* -------------------------------------------------------------------------- */
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int
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int
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_read (int file,
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_read (int file,
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char *ptr,
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char *buf,
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int len)
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int len)
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{
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{
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if (STDIN_FILENO == file)
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if (STDIN_FILENO == file)
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{
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{
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if (BOARD_HAS_UART)
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{
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/* UART supported. Read from it */
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int i;
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for (i = 0; i < len; i++)
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{
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buf[i] = __uart_getc ();
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#ifdef UART_AUTO_ECHO
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__uart_putc (buf[i]);
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#endif
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/* Return partial buffer if we get EOL */
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if ('\n' == buf[i])
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{
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return i;
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}
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}
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return i; /* Filled the buffer */
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}
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else
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{
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return 0; /* EOF */
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return 0; /* EOF */
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}
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}
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}
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else
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else
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{
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{
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errno = EBADF;
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errno = EBADF;
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return -1;
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return -1;
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}
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}
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