regress/lib/libc/gen/seekdir-twice/seekdir-twice.c

   1 #include <assert.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <dirent.h>
   5 #include <sys/stat.h>
   6
   7 int
   8 main(void)
   9 {
  10         DIR *dp;
  11
  12         mkdir("t", 0755);
  13         creat("t/a", 0600);
  14         creat("t/b", 0600);
  15         creat("t/c", 0600);
  16
  17         if (dp = opendir("t")) {
  18                 char *wasname;
  19                 struct dirent *entry;
  20                 long here;
  21
  22                 /* skip two */
  23                 entry = readdir(dp);
  24                 entry = readdir(dp);
  25                 entry = readdir(dp);
  26 #ifdef DEBUG
  27                 printf("first found: %s\n", entry->d_name);
  28 #endif
  29
  30                 here = telldir(dp);
  31 #ifdef DEBUG
  32                 printf("pos returned by telldir: %d\n", here);
  33 #endif
  34                 entry = readdir(dp);
  35 #ifdef DEBUG
  36                 printf("second found: %s\n", entry->d_name);
  37 #endif
  38
  39                 wasname = strdup(entry->d_name);
  40                 entry = readdir(dp);
  41 #ifdef DEBUG
  42                 printf("third found: %s\n", entry->d_name);
  43 #endif
  44
  45                 seekdir(dp, here);
  46                 entry = readdir(dp);
  47 #ifdef DEBUG
  48                 printf("should be == second: %s\n", entry->d_name);
  49
  50                 printf("pos given to seekdir: %d\n", here);
  51 #else
  52                 assert(strcmp(entry->d_name, wasname) == 0);
  53 #endif
  54                 seekdir(dp, here);
  55                 here = telldir(dp);
  56 #ifdef DEBUG
  57                 printf("pos returned by telldir: %d\n", here);
  58 #endif
  59
  60                 entry = readdir(dp);
  61 #ifdef DEBUG
  62                 printf("should be == second: %s\n", entry->d_name);
  63 #else
  64                 assert(strcmp(entry->d_name, wasname) == 0);
  65 #endif
  66
  67                 seekdir(dp, here);
  68                 entry = readdir(dp);
  69 #ifdef DEBUG
  70                 printf("should be == second: %s\n", entry->d_name);
  71 #else
  72                 assert(strcmp(entry->d_name, wasname) == 0);
  73 #endif
  74
  75                 closedir(dp);
  76         }
  77         return 0;
  78 }