这是我自己编写的函数 一个字符串包含另一个字符串的个数  但无法得到正确的结果 请大牛 帮忙修改下
int conten(char *srcstr, char *compstr)
{
    if (srcstr==NULL || compstr == NULL)
        return NULL;

    int len = 0;
    char *temp1, *temp2;

    while (*srcstr != '\0')
    {
        temp1 = srcstr;
        temp2 = compstr;
        do
        {
            if (temp2 == '\0')
                len++;
        }while (*temp1++ == *temp2++);
        srcstr++;
    }
    return len;
}

#include<stdio.h>

int
conten(char *srcstr, char *compstr)
{
      int len = 0;
      char *temp1, *temp2;

      if (srcstr==NULL || compstr == NULL)
            return 0;
      while (*srcstr != '\0')
      {
            temp1 = srcstr;
            temp2 = compstr;
            do
            {
                  if (*temp2 == '\0')        /*chang temp2 to *temp2*/
                        len++;
            }while (*temp1++ == *temp2++);
            srcstr++;
      }
      return len;
}

int main(void)
{
      char s1[]="hell hell",s2[]="hel";
      int i;

      i=conten(s1,s2);
      printf("%d",i);
      getch();
      return 0;
}