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#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
 
void wtf_1(char* data){
	//char str[80]={};
	char buf[]={"touch_out_1_2"};
	int device=0, timeout=0;
 
	itoa(device, buf[10], 10);
    itoa(timeout, buf[12], 10);
 
    printf ("wn: %d, %d", device, timeout);
 
}
 
void wtf_2(void){
	static char data[14]={0};
	data[0] = 'a';
	data[1] = 'b';
	data[2] = '\0';
 
	wtf_1(data);
}
 
int main(void) {
	int i;
	for (i = 0; i < 4; ++i)
	{
		wtf_2();
	}
 
	return 0;
}
 

prog.c: In function ‘wtf_1’:
prog.c:11:2: warning: implicit declaration of function ‘itoa’ [-Wimplicit-function-declaration]
  itoa(device, buf[10], 10);
  ^
/home/RrK6RX/ccET60p2.o: In function `wtf_1':
prog.c:(.text+0x1b): undefined reference to `itoa'
prog.c:(.text+0x37): undefined reference to `itoa'
collect2: error: ld returned 1 exit status

Standard output is empty