linux下遍历目录功能实现

/*
编译:
dir:dir.c
    gcc -o $@ $<
*/
   
#include    <stdio.h>
#include    <string.h>
#include    <sys/types.h>
#include    <dirent.h>
#include     <sys/stat.h>

int do_search_dir(char *path);
int do_check_dir(char *fullpath, char* truefullpath);
void usage(char *apps);
int count = 0;

int
main(int argc,char **argv)
{    
    char fullpath[1024]={0};
    if(argc != 2)
    {
        usage(argv[0]);
        return -1;
    }
    if( -1 ==do_check_dir(argv[1], fullpath) )
        return -1;
          do_search_dir(fullpath);
    printf("\nThe total number of files is %d in the directory [%s].\n\n", count , fullpath);
    return 0;
}

//return -1 search fail
//return 0 search ok
int
do_search_dir(char *path)
{
    DIR *dir;
    struct dirent *s_dir;
    struct stat file_stat;   
    char currfile[1024]={0};
    int len = strlen(path);
    if(path[len-1] != '/')
    {
        path[len] = '/';
        path[len+1] = 0;
    }
    printf("%s\n",path);
    if( (dir=opendir(path)) == NULL)
    {
        printf("opendir(path) error.\n");
        return -1;
    }
          while((s_dir=readdir(dir))!=NULL)
    {
              if((strcmp(s_dir->d_name,".")==0)||(strcmp(s_dir->d_name,"..")==0))
            continue;
              sprintf(currfile,"%s%s",path,s_dir->d_name);
              stat(currfile,&file_stat);
              if(S_ISDIR(file_stat.st_mode))
                  do_search_dir(currfile);
              else
                  printf("%-32s\tOK\n",currfile);
            count++;
            //
            //添加针对此文件的操作
            //
          }
          closedir(dir);
    return 0;
}

void
usage(char * apps)
{
    printf("Directory to search for files.\n\n");
    printf("Usage: %s dirpath\n\n",apps);
}

//return -1 directory error
//args:
//input     -->fullpath
//output     -->truefullpath
int
do_check_dir(char *fullpath, char* truefullpath)
{
    DIR *dir;
    int pathlen, i ,k;
    if( (dir=opendir(fullpath)) == NULL)
    {
        printf("opendir fullpath error.\nMaybe dir error.\n");
        return -1;
    }
    closedir(dir);
    pathlen = strlen(fullpath);
    if( pathlen-1 != 0)        // 路径长度不为1 的目录
    {
        if( fullpath[pathlen-1] == '/' )    // 最后字节是'/'
        {   
            for(i=pathlen-1; i>=0 ; i--)
            {
                if( fullpath[i-1] != '/' && fullpath[i] == '/')
                    break;
            }   
            fullpath[i+1] = 0;
        }
        else        // 最后字节不是'/'
        {
            fullpath[pathlen] = '/';
            fullpath[pathlen+1] = 0;
        }
    }
    else     // 路径长度为1 的目录
    {
        if(fullpath[pathlen-1] != '/')
        {
            fullpath[pathlen] = '/';
            fullpath[pathlen+1] = 0;
        }
        else
            fullpath[pathlen] = 0;
    }
    strcpy(truefullpath,fullpath);
    return 0;
}