Write a String to filename in c - c

Question

I have this code and can´t get it properly to work. I want to write the String Output into a file.
static void wr_message_user_info_login(wi_p7_message_t *message) {
wi_date_t *date;
wi_string_t *string, *interval;
wi_p7_uint32_t uid, build, bits;
wr_printf_block(WI_STR("Login: %#"),
wi_p7_message_string_for_name(message, WI_STR("wired.user.login")));
char *filename = "/.wirebot/wirebot.login";
char *home_dir = getenv("HOME");
char *filepath = malloc(strlen(home_dir) + strlen(filename) + 1);
sprintf(filepath, "%s%s", home_dir, filename);
FILE *fp;
fp = fopen(filepath, "w");
if (fp == NULL)
{
}
else
{
fputs((WI_STR("Login: %#")), fp);
);
fclose(fp);
}
"Login: %#" should be writed to file. Echoing is working fine.

Answer 1

You provided a snippet of code with a lot of stuff missing. If you strip the stuff you haven't told us about it seems to work:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void wr_message_user_info_login() {
const char *filename = "/.wirebot/wirebot.login";
const char *home_dir = getenv("HOME");
char *filepath = malloc(strlen(home_dir) + strlen(filename) + 1);
if(!filepath) {
printf("malloc failed\n");
return;
}
sprintf(filepath, "%s%s", home_dir, filename);
FILE *fp = fopen(filepath, "w");
if (!fp) {
printf("fopen failed\n");
free(filepath);
return;
}
free(filepath);
fputs("Login: %#", fp);
fclose(fp);
}
int main() {
wr_message_user_info_login();
}
and example run:
$ mkdir ~/.wirebot && ./a.out && cat ~/.wirebot/wirebot.login
Login: %#
Maybe the directory ~/.wirebot doesn't exist on your host?