135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/* 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;
|
|
}
|