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/********************************************************** * Author : oyjb * Email : jbouyang@126.com * Last modified : 2015-09-13 23:01 * Filename : get_file_count.c * Description : copy right for oyjb * *******************************************************/ #include <stdio.h> #include <stdlib.h> #include <dirent.h> #include <sys/stat.h> #include <errno.h> #include <string.h> #define MAX 1024 int get_file_count( const char *root); int main( int argc, char *argv[]) { if (argc < 2) { printf ( "wrong usage.\n" ); exit (1); } int total = 0; total = get_file_count(argv[1]); printf ( "%s has %d files.\n" , argv[1], total); exit (0); } /* * The parameter for function of get_file_count is a filepath,represents a directory's root * This function return the numbers of all regular files in this directory,include child directory */ int get_file_count( const char *root) { DIR *dir; struct dirent *ptr; int total = 0; //numbers of files char path[MAX]; dir = opendir(root); //open directory if (dir == NULL) { perror ( "fail to open directory" ); exit (1); } errno = 0; while ( (ptr = readdir(dir)) != NULL) { //jump the . and .. if ( strcmp (ptr->d_name, "." ) == 0 || strcmp (ptr->d_name, ".." ) == 0) continue ; /* * 以下的得到子目录全路径的方法还可以是: * sprintf(path, "%s/%s", root, ptr->d_name); */ sprintf (path, "%s/%s" , root, ptr->d_name); /* path[0] = '\0'; strcat(path, root); strcat(path, "/"); //you must be strcat the character "/",other than error. strcat(path, ptr->d_name); */ /* * 由于xfs文件系统在读取dirent的d_type时无法读取,因此需要转到stat函数处理,读取文件信息 * 否则下面的代码可换成: * if (ptr->d_type == DT_DIR) *
total += get_file_count(path); * if (ptr->d_type == DT_REG) *
++total; * 正是因为d_type与文件系统有关(应该是),所以最好还是用stat函数获取文件类型信息 */ struct stat sta; if (lstat(path, &sta) == -1) { printf ( "%s\n" , path); perror ( "fail to get file information." ); return 0; } if (S_ISDIR(sta.st_mode)) total += get_file_count(path); else if (S_ISREG(sta.st_mode) || S_ISLNK(sta.st_mode)) ++total; } if ( errno != 0) { perror ( "fail to read dir" ); exit (1); } closedir(dir); return total; } |