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libc.c
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libc.c
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/* Copyright (c) 2011-2012, Peter A. Bigot
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the software 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
/* We assume that the toolchain declaration for setvbuf() is
* ABI-compatible with ours, but it probably won't be type-compatible,
* so try to fool the compiler into not performing a compatibility
* check. */
#define setvbuf NOT_REALLY_SETVBUF
#include <stdio.h>
#undef setvbuf
/* Make sure nobody defined putchar to be a macro. That's not how we
* use the thing. */
#undef putchar
#include <embtextf/config.h>
#include <embtextf/stdio.h>
#include <embtextf/stdarg.h>
#include <embtextf/uprintf.h>
#if EMBTEXTF_PROVIDE_LIBC - 0
#if (EMBTEXTF_ENABLE_LIBC_SETVBUF - 0)
int setvbuf (void * stream, char * buf, int mode, size_t size)
{
return EOF;
}
#endif /* EMBTEXTF_ENABLE_LIBC_SETVBUF */
int
printf (const char *fmt, ...)
{
va_list argp;
int rc;
va_start(argp, fmt);
rc = embtextf_vuprintf(putchar, fmt, argp);
va_end(argp);
return rc;
}
int
vprintf (const char *fmt, va_list argp)
{
return embtextf_vuprintf(putchar, fmt, argp);
}
int
puts (const char *s)
{
while (*s && (0 <= putchar(*s++))) {
;
}
if (*s) {
return EOF;
}
return putchar('\n');
}
/* Pointer to the next location into which an output can be stored. */
static char * strPtr_;
/* Pointer to the last location into which an output can be stored.
* Value will be NULL if there is no user-provided maximum length. */
static char * strEnd_;
static int
strAppend_ (int c)
{
/* Do not store the character if doing so would use up the last
* available space in the output. Return as though the store
* succeeded, whether or not it did; this ensures the total length
* that would have been written is returned. */
if ((NULL == strEnd_) || (strPtr_ < strEnd_)) {
*strPtr_ = c;
++strPtr_;
}
return c;
}
int
vsprintf (char *buf, const char *fmt, va_list argp)
{
int rc;
strPtr_ = buf;
strEnd_ = NULL;
rc = embtextf_vuprintf(strAppend_, fmt, argp);
*strPtr_ = 0;
return rc;
}
int
sprintf (char *buf, const char *fmt, ...)
{
va_list argp;
int rc;
va_start(argp, fmt);
rc = vsprintf(buf, fmt, argp);
va_end(argp);
return rc;
}
int
vsnprintf (char *buf, size_t size, const char *fmt, va_list argp)
{
int rc;
strPtr_ = buf;
strEnd_ = strPtr_ + size;
if (0 < size) {
--strEnd_;
}
rc = embtextf_vuprintf(strAppend_, fmt, argp);
if (0 < size) {
*strPtr_ = 0;
}
return rc;
}
int
snprintf (char *buf, size_t size, const char *fmt, ...)
{
va_list argp;
int rc;
va_start(argp, fmt);
rc = vsnprintf(buf, size, fmt, argp);
va_end(argp);
return rc;
}
#endif /* EMBTEXTF_PROVIDE_LIBC */