lib/libc/iar/src/libc-hooks.c

/*
 * Copyright (c) 2025 IAR Systems AB
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/kernel.h>
#include <stdio.h>

static int _stdout_hook_default(int c)
{
	(void)(c); /* Prevent warning about unused argument */

	return EOF;
}

static int (*_stdout_hook)(int) = _stdout_hook_default;

void __stdout_hook_install(int (*hook)(int))
{
	_stdout_hook = hook;
}

int fputc(int c, FILE *f)
{
	return (_stdout_hook)(c);
}

#pragma weak __write
size_t __write(int handle, const unsigned char *buf, size_t bufSize)
{
	size_t nChars = 0;
	/* Check for the command to flush all handles */
	if (handle == -1) {
		return 0;
	}
	/* Check for stdout and stderr
	 * (only necessary if FILE descriptors are enabled.)
	 */
	if (handle != 1 && handle != 2) {
		return -1;
	}
	for (/* Empty */; bufSize > 0; --bufSize) {
		int ret = (_stdout_hook)(*buf);

		if (ret == EOF) {
			break;
		}
		++buf;
		++nChars;
	}
	return nChars;
}