readline function with increasing buffer

readline.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#define LBUF_SZ 0x402
#define NEWL '\n'

struct string{
	char  *str;
	size_t len;
};

struct string readline(FILE* stream){
	char buf[LBUF_SZ];
	struct string line = {NULL, 0};
	int nl = 0;
	while(!feof(stream)){
		if(!fgets(buf, sizeof(buf), stream))
			break;
		size_t bufl = strlen(buf);
		if(buf[bufl - 1] == NEWL){
			nl = 1;
			buf[--bufl] = '\0';
		}
		char *linet = realloc(line.str, line.len + bufl + 1);
		if(!linet)
			break;
		line.str = linet;
		strcpy(line.str + line.len, buf);
		line.len += bufl;
		if(nl)
			break;
	}
	return line;
}