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Diffstat (limited to 'user/lib/libc/printf.c')
| -rw-r--r-- | user/lib/libc/printf.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/user/lib/libc/printf.c b/user/lib/libc/printf.c new file mode 100644 index 0000000..609ff37 --- /dev/null +++ b/user/lib/libc/printf.c @@ -0,0 +1,169 @@ +/* + **************************************************************************** + * (C) 2003 - Rolf Neugebauer - Intel Research Cambridge + **************************************************************************** + * + * File: printf.c + * Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk) + * Changes: Grzegorz Milos (gm281@cam.ac.uk) + * + * Date: Aug 2003, Aug 2005 + * + * Environment: Xen Minimal OS + * Description: Library functions for printing + * (freebsd port, mainly sys/subr_prf.c) + * + **************************************************************************** + * + *- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD: src/sys/libkern/divdi3.c,v 1.6 1999/08/28 00:46:31 peter Exp $ + */ + +#include "stdio.h" +#include "unistd.h" + +int printf(const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vprintf(fmt, args); + va_end(args); + return i; +} + +int fprintf(FILE *stream, const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vfprintf(stream, fmt, args); + va_end(args); + return i; +} + +int sprintf(char *buf, const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vsprintf(buf, fmt, args); + va_end(args); + return i; +} + +int snprintf(char *buf, size_t size, const char *fmt, ...) +{ + va_list args; + int i; + + va_start(args, fmt); + i = vsnprintf(buf, size, fmt, args); + va_end(args); + return i; +} + +int vprintf(const char *fmt, va_list args) +{ + return vfprintf(stdout, fmt, args); +} + +#define __LIBC_PRINTF_BUFSIZE 1024 + +int vfprintf(FILE *stream, const char *fmt, va_list args) +{ + /* I'm really lazy */ + char buf[__LIBC_PRINTF_BUFSIZE]; + int ret = vsnprintf(buf, __LIBC_PRINTF_BUFSIZE, fmt, args); + if (ret > 0) + { + // write(stream->fd, buf, ret); + +#if 1 + /* slow but simple */ + for (int i = 0; i < ret; i++) + { + stream->buffer[stream->offset++] = buf[i]; + if (stream->offset == sizeof(stream->buffer) || buf[i] == '\n') + { + // flush + fflush(stream); + } + } +#endif + } + return ret; +} + +int vsprintf(char *buf, const char *fmt, va_list args) +{ + return vsnprintf(buf, 0xffffffffUL, fmt, args); +} + +void __do_fflush(FILE *stream) +{ + if (!stream) + { + return; + } + + if (stream->offset > 0) + { + write(stream->fd, stream->buffer, stream->offset); + stream->offset = 0; + } +} + +int fflush(FILE *stream) +{ + if (!stream) + { + __do_fflush(stdin); + __do_fflush(stdout); + __do_fflush(stderr); + } + else + { + __do_fflush(stream); + } + + return 0; +} |