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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [libgloss/] [or32/] [read-uart.c] - Rev 320
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/* read-uart.c. Implementation of the _read syscall for newlib with UART. 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> #undef errno extern int errno; /* -------------------------------------------------------------------------- */ /*!Read from a file with a UART. We only support reading from stdin. 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 number of bytes read 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) { 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 { errno = EBADF; return -1; } } /* _read () */
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