Linux下用c语言实现whereis.

简单的一个whereis的实现，代码如下：

 #include <stdio.h>
 #include <errno.h>
 #include <dirent.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 void dir_scan(char *path, char *file, char * fileToSearch);
 int count = ;

 int main(int argc, char *argv[])
 {
     struct stat s;
     if(argc != ){
         printf("error argu!");
         exit();
     }
     if(lstat(argv[], &s) < ){
         printf("lstat error!");
         exit();
     }
     if(!S_ISDIR(s.st_mode)){
         printf("This is not a dir name!\n");
         exit();
     }
     dir_scan("", argv[], argv[]);
     exit();
 }

 void dir_scan(char * path, char * file, char * fileToSearch)
 {
     struct stat s;
     DIR * dirPtr;
     struct dirent * dtPtr;
     char dirName[];
     memset(dirName, ,  * sizeof(char));
     strcpy(dirName, path);

     if(lstat(file, &s) < ){
             printf("asdasdad");
              // fprintf(stdout, "The reason is %s\t ", strerror(errno));
            exit(());
        }
     if(S_ISDIR(s.st_mode)){
        strcat(dirName, file);
        strcat(dirName, "/");
        // printf("now the dir name is %s\n", file);
        if((dirPtr = opendir(file)) == NULL){
             printf("open dir error!\n");
             exit();
             printf("The count now is %d\n", count);
        }
        if(chdir(file) < ){
             printf("chdir error!\n");
             exit();
        }
        while((dtPtr = readdir(dirPtr)) != NULL){
             if(dtPtr->d_name[] == '.')
                 continue;
             dir_scan(dirName, dtPtr->d_name, fileToSearch);
        }
        if(dirPtr != NULL)
             closedir(dirPtr);
        if(chdir("..") < ){
             printf("chdir error!\n");
             exit();
        }
     }else{
           if(strstr(file, fileToSearch) != NULL && (!strstr(file, "."))){
                 printf("%s%s\n", dirName, file);
                 // printf("adasdadad\n");
           }
         count++;
     }
 }