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Signed-off-by:  <inaky.perez-gonzalez@intel.com>
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Inaky Perez-Gonzalez 2015-04-10 16:44:37 -07:00
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lib/libc/minimal/source/stdout/sprintf.c Normal file
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/* sprintf.c */
/*
* Copyright (c) 1997-2010, 2013-2014 Wind River Systems, Inc.
*
* 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) Neither the name of Wind River Systems 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.
*/
#include <stdarg.h>
#include <stdio.h>
extern int _prf(int (*func)(), void *dest,
const char *format, va_list vargs);
struct emitter {
char *ptr;
int len;
};
static int sprintf_out(int c, struct emitter *p)
{
if (p->len > 1) { /* need to reserve a byte for EOS */
*(p->ptr) = c;
p->ptr += 1;
p->len -= 1;
}
return 0; /* indicate keep going so we get the total count */
}
int snprintf(char *restrict s, size_t len, const char *restrict format, ...)
{
va_list vargs;
struct emitter p;
int r;
char dummy;
if ((int) len <= 0) {
if (len == 0) {
s = &dummy; /* write final NUL to dummy, since can't change *s */
} else {
len = 0x7fffffff; /* allow up to "maxint" characters */
}
}
p.ptr = s;
p.len = (int) len;
va_start(vargs, format);
r = _prf(sprintf_out, (void *) (&p), format, vargs);
va_end(vargs);
*(p.ptr) = 0;
return r;
}
int sprintf(char *restrict s, const char *restrict format, ...)
{
va_list vargs;
struct emitter p;
int r;
p.ptr = s;
p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */
va_start(vargs, format);
r = _prf(sprintf_out, (void *) (&p), format, vargs);
va_end(vargs);
*(p.ptr) = 0;
return r;
}
int vsnprintf(char *restrict s, size_t len, const char *restrict format, va_list vargs)
{
struct emitter p;
int r;
char dummy;
if ((int) len <= 0) {
if (len == 0) {
s = &dummy; /* write final NUL to dummy, since can't change *s */
} else {
len = 0x7fffffff; /* allow up to "maxint" characters */
}
}
p.ptr = s;
p.len = (int) len;
r = _prf(sprintf_out, (void *) (&p), format, vargs);
*(p.ptr) = 0;
return r;
}
int vsprintf(char *restrict s, const char *restrict format, va_list vargs)
{
struct emitter p;
int r;
p.ptr = s;
p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */
r = _prf(sprintf_out, (void *) (&p), format, vargs);
*(p.ptr) = 0;
return r;
}