生成随机字符串代码

code:

[root@localhost ~]# cat rand.c
#include <stdio.h> 
#include <stdlib.h>
#include <time.h>

char * rand_str(int in_len) 
{ 
  char *__r = (char *)malloc(in_len + 1); 

  int i; 

  if (__r == 0) 
  { 
    return 0; 
  } 

  srand(time(NULL) + rand());    
  for (i = 0; i  < in_len; i++) 
  { 
    __r[i] = rand()%94+32;      
  } 

  __r[i] = 0; 

  return __r; 
} 

void main() 
{ 
    int i=0;
    while(i++<10)
    {
        char *p = rand_str(15);
        printf("group %02d: %s
", i, p);
        free(p);
    }
}