zephyr/samples/subsys/console/echo/src/main.c
Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int
As both C and C++ standards require applications running under an OS to
return 'int', adapt that for Zephyr to align with those standard. This also
eliminates errors when building with clang when not using -ffreestanding,
and reduces the need for compiler flags to silence warnings for both clang
and gcc.

Most of these changes were automated using coccinelle with the following
script:

@@
@@
- void
+ int
main(...) {
	...
-	return;
+	return 0;
	...
}

Approximately 40 files had to be edited by hand as coccinelle was unable to
fix them.

Signed-off-by: Keith Packard <keithp@keithp.com>
2023-04-14 07:49:41 +09:00

29 lines
608 B
C

/*
* Copyright (c) 2017 Linaro Limited
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/kernel.h>
#include <zephyr/console/console.h>
static const char prompt[] = "Start typing characters to see them echoed back\r\n";
int main(void)
{
console_init();
printk("You should see another line with instructions below. If not,\n");
printk("the (interrupt-driven) console device doesn't work as expected:\n");
console_write(NULL, prompt, sizeof(prompt) - 1);
while (1) {
uint8_t c = console_getchar();
console_putchar(c);
if (c == '\r') {
console_putchar('\n');
}
}
return 0;
}