RAMFS mounting program - c

Question

I rewrote a bash script into a standalone C program for mounting the current directory into the ramfs. However I still use "system()" for some of the functions. The only thing that still bothers me is the use of C mount function. In my code I call it with a system call but I want to know what is the right use in my case for C`s system.
int main(int argc, char* argv[])
{
(void) argc; // unused
bool matched_result = false;
// extra size
char pwd[512]={0};
getcwd(pwd, sizeof(pwd)/sizeof(pwd[0]));
printf("Current working dir is: %s\n", pwd);
// Check is already mounted ramfs on the current directory.
// The beter way is manual parsing.
// in order to avoid that process we have to write dirwalker
// to list all mounted fses but for now will use this one
FILE* mntstatus = popen("mount", "r");
// assume no more than 512 chars per line
char buff[512]={0};
while (fgets(buff, 512, mntstatus) != NULL) {
char* match = strchr(buff, '/');
// trim 3 whitespaces from the end
trim_end(match, ' ', 3);
if (strcmp(match, pwd)==0) {
printf("Match: [%s]\n", match);
matched_result = true;
break; // no need to search more
}
}
// our cwd is not mounted
if (!matched_result) {
// empty, ok we can mount here
// just efective-uid is not enough for mount
// i need real-uid
setuid(0);
int res = mount_filesystem(pwd, "ramfs", "ramfs", 0, "rw", 0);
//int res = system("mount -t ramfs ramfs `pwd`");
if (res == 0) {
printf("Mount ok\n");
// convert to octals
int octal_perms = strtol(g_Permissions, 0, 8);
if (chmod(pwd, octal_perms) < 0) {
fprintf(stderr, "%s: error in chmod(%s, %s) - %d (%s)\n",
argv[0], // program
pwd, // current dir
g_Permissions, // with permissions
errno, // Ermac :)
strerror(errno));
exit(1);
}
} else {
printf("Mount failed!\n");
return 1;
}
} else {
printf("Dude you are ok!\n");
}
return 0;
}
void trim_end(char *str, const char delim, int count)
{
char* begin = str;
char* end = &str[strlen(str)-1];
int i=0;
while ((i < count) && ( begin != end)) {
if (*end == delim) {
i++;
}
*end-- = 0;
}
}
void register_exit_callback(cbAtExit ex)
{
atexit(ex);
}
int mount_filesystem(const char *src, const char *tgt, const char *fstype, unsigned long flags,
const char *mode, const char *uid)
{
char mode_uid[256]={0};
if((mode != NULL) && (uid != NULL)) {
sprintf(mode_uid, "mode=%s,uid=%s", mode, uid);
}
int result = mount(src, tgt, fstype, flags, mode_uid);
// handle result outside
return result;
}