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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc1/] [libgloss/] [or32/] [write.c] - Rev 517
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/* write.c. Implementation of the _write 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 "or1ksim-board.h" #undef errno extern int errno; /* -------------------------------------------------------------------------- */ /*!Write a single character to standard output for the simulator @param[in] c The character to write */ /* -------------------------------------------------------------------------- */ static void outbyte (char c) { register char t1 asm ("r3") = c; asm volatile ("\tl.nop\t%0" : : "K" (NOP_PUTC), "r" (t1)); } /* outbyte () */ /* -------------------------------------------------------------------------- */ /*!Write a buffer to a file. Only output to stdout or stderr is supported, and both of those are directed to the single output stream. Remember that this function is *not* reentrant, so no static state should be held. @param[in] file The fileno for output. @param[in] buf The bytes to write. @param[in] nbytes The number of bytes to write. @return The number of bytes written on success, or -1 with an error code in the global variable errno on failure. */ /* -------------------------------------------------------------------------- */ int _write (int file, char *buf, int nbytes) { int i; /* We only handle stdout and stderr */ if ((file != STDOUT_FILENO) && (file != STDERR_FILENO)) { errno = EBADF; return -1; } /* Output character at at time */ for (i = 0; i < nbytes; i++) { outbyte (buf[i]); } return nbytes; } /* _write () */
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