lib/libc/minimal/source/stdout/sprintf.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>
#include <zephyr/sys/cbprintf.h>

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 *ZRESTRICT str, size_t len,
	     const char *ZRESTRICT format, ...)
{
	va_list vargs;

	struct emitter p;
	int     r;
	char    dummy;

	if (len == 0) {
		str = &dummy; /* write final NUL to dummy, can't change *s */
	}

	p.ptr = str;
	p.len = (int) len;

	va_start(vargs, format);
	r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
	va_end(vargs);

	*(p.ptr) = 0;
	return r;
}

int sprintf(char *ZRESTRICT str, const char *ZRESTRICT format, ...)
{
	va_list vargs;

	struct emitter p;
	int     r;

	p.ptr = str;
	p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */

	va_start(vargs, format);
	r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);
	va_end(vargs);

	*(p.ptr) = 0;
	return r;
}

int vsnprintf(char *ZRESTRICT str, size_t len,
	      const char *ZRESTRICT format, va_list vargs)
{
	struct emitter p;
	int     r;
	char    dummy;

	if (len == 0) {
		str = &dummy; /* write final NUL to dummy, can't change * *s */
	}

	p.ptr = str;
	p.len = (int) len;

	r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);

	*(p.ptr) = 0;
	return r;
}

int vsprintf(char *ZRESTRICT str, const char *ZRESTRICT format,
	     va_list vargs)
{
	struct emitter p;
	int     r;

	p.ptr = str;
	p.len = (int) 0x7fffffff; /* allow up to "maxint" characters */

	r = cbvprintf(sprintf_out, (void *) (&p), format, vargs);

	*(p.ptr) = 0;
	return r;
}