Linux下用c语言实现whereis.
简单的一个whereis的实现，代码如下：
1 #include <stdio.h> 2 #include <errno.h> 3 #include <dirent.h> 4 #include <sys/types.h> 5 #include <sys/stat.h> 6 void dir_scan(char *path, char *file, char * fileToSearch); 7 int count = 0; 8 9 int main(int argc, char *argv[]) 10 { 11 struct stat s; 12 if(argc != 3){ 13 printf("error argu!"); 14 exit(1); 15 } 16 if(lstat(argv[1], &s) < 0){ 17 printf("lstat error!"); 18 exit(2); 19 } 20 if(!S_ISDIR(s.st_mode)){ 21 printf("This is not a dir name!\n"); 22 exit(3); 23 } 24 dir_scan("", argv[1], argv[2]); 25 exit(0); 26 } 27 28 29 void dir_scan(char * path, char * file, char * fileToSearch) 30 { 31 struct stat s; 32 DIR * dirPtr; 33 struct dirent * dtPtr; 34 char dirName[1000]; 35 memset(dirName, 0, 1000 * sizeof(char)); 36 strcpy(dirName, path); 37 38 if(lstat(file, &s) < 0){ 39 printf("asdasdad"); 40 // fprintf(stdout, "The reason is %s\t ", strerror(errno)); 41 exit((4)); 42 } 43 if(S_ISDIR(s.st_mode)){ 44 strcat(dirName, file); 45 strcat(dirName, "/"); 46 // printf("now the dir name is %s\n", file); 47 if((dirPtr = opendir(file)) == NULL){ 48 printf("open dir error!\n"); 49 exit(5); 50 printf("The count now is %d\n", count); 51 } 52 if(chdir(file) < 0){ 53 printf("chdir error!\n"); 54 exit(6); 55 } 56 while((dtPtr = readdir(dirPtr)) != NULL){ 57 if(dtPtr->d_name[0] == '.') 58 continue; 59 dir_scan(dirName, dtPtr->d_name, fileToSearch); 60 } 61 if(dirPtr != NULL) 62 closedir(dirPtr); 63 if(chdir("..") < 0){ 64 printf("chdir error!\n"); 65 exit(7); 66 } 67 }else{ 68 if(strstr(file, fileToSearch) != NULL && (!strstr(file, "."))){ 69 printf("%s%s\n", dirName, file); 70 // printf("adasdadad\n"); 71 } 72 count++; 73 } 74 }
