c语言获取文件后缀

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

char* filename_suffix(char* filename, char delimit)
{
    int len=strlen(filename);
    int i;
    for(i=0; i<len; i++)
    {
        if(filename[len-i] == delimit)
        {
            return (filename+len-i);
        }
    }
    return NULL;
}

void main( void )
{
   char* path = "/home/lhb/share/data/1/10600000.bin";
   char *p=strrchr(path, '.');//倒序查找字符出现的位置，返回地址

   printf( "p=%p, filename suffix: %s\n", p,p+1 );
   p=filename_suffix(path, '.');
   if(NULL != p)
   {
        printf("def:filename suffix:%s\n",p+1);
   }
   else
   {
        printf("no suffix\n");
   }

   char* path1 = "/home/lhb/share/data/1/10600000";
   char *p1=strrchr(path, '.');

   printf("path1=%p,p1=%p,%s\n", path1,p1,p1);
   p1=filename_suffix(path1, '.');
   if(NULL != p1)
   {
        printf("def:filename suffix:%s\n",p1+1);
   }
   else
   {
        printf("no suffix\n");
   }
}
                                                           

运行结果：

p=0x4008e7, filename suffix: bin
def:filename suffix:bin
path1=0x400938,p1=0x4008e7,.bin
no suffix

疑问：strrchr函数使用中会有问题？没有对文件名长度限制？