Print all permutations of a string

// INPUT : abc
// OUTPUT : abc,acb,bac,bca,cab,cba

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

void strpermuteRecur(char *str,int *flag,int len,char *out,int n){
int i;
if(len == n){
out[len] = '\0';
printf("%s\n",out);
} else{
for(i=0;i<n;i++){
if(!flag[i]){
out[len++] = str[i];
flag[i] = 1;
strpermuteRecur(str,flag,len,out,n);
flag[i] = 0;
len--;
}
}
}
}

void strpermute(char *str){
static int *flag;
static char *out;
int i;
int n = strlen(str);
flag = (int *)malloc(sizeof(int)*n);
out = (char *)malloc(sizeof(char)*n);
for(i=0;i<n;i++){
flag[i] = 0;
}
strpermuteRecur(str,flag,0,out,n);
}

int main(){
char str[] = "abc";
strpermute(str);
return 0;
}