106 lines
1.9 KiB
C
106 lines
1.9 KiB
C
/* sprintf.c */
|
|
|
|
/*
|
|
* Copyright (c) 1997-2010, 2013-2014 Wind River Systems, Inc.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#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 *_MLIBC_RESTRICT s, size_t len,
|
|
const char *_MLIBC_RESTRICT format, ...)
|
|
{
|
|
va_list vargs;
|
|
|
|
struct emitter p;
|
|
int r;
|
|
char dummy;
|
|
|
|
if (len == 0) {
|
|
s = &dummy; /* write final NUL to dummy, can't change *s */
|
|
}
|
|
|
|
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 *_MLIBC_RESTRICT s, const char *_MLIBC_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 *_MLIBC_RESTRICT s, size_t len,
|
|
const char *_MLIBC_RESTRICT format, va_list vargs)
|
|
{
|
|
struct emitter p;
|
|
int r;
|
|
char dummy;
|
|
|
|
if (len == 0) {
|
|
s = &dummy; /* write final NUL to dummy, can't change * *s */
|
|
}
|
|
|
|
p.ptr = s;
|
|
p.len = (int) len;
|
|
|
|
r = _prf(sprintf_out, (void *) (&p), format, vargs);
|
|
|
|
*(p.ptr) = 0;
|
|
return r;
|
|
}
|
|
|
|
int vsprintf(char *_MLIBC_RESTRICT s, const char *_MLIBC_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;
|
|
}
|