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98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
#define _GNU_SOURCE
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#include <dirent.h> /* Defines DT_* constants */
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#define handle_error(msg) \
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do { perror(msg); exit(EXIT_FAILURE); } while (0)
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struct linux_dirent64 {
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ino64_t d_ino; /* 64-bit inode number */
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off64_t d_off; /* 64-bit offset to next structure */
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unsigned short d_reclen; /* Size of this dirent */
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unsigned char d_type; /* File type */
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char d_name[]; /* Filename (null-terminated) */
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};
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#define BUF_SIZE 1024000
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void flagsort(char *s) {
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int i, j;
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if (!s[0])
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return;
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// adapted insertion sort from http://stackoverflow.com/a/2789530
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for (i = 1; s[i]; i++) {
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char t = s[i];
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for (j = i; j >= 1 && t < s[j-1]; j--)
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s[j] = s[j-1];
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s[j] = t;
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}
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}
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int
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main(int argc, char *argv[])
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{
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int fd, nread;
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char buf[BUF_SIZE];
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struct linux_dirent64 *d;
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int bpos;
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char d_type;
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fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
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if (fd == -1)
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handle_error("open");
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while (1) {
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nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
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if (nread == -1)
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handle_error("getdents64");
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if (nread == 0)
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break;
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printf("--------------- nread=%d ---------------\n", nread);
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printf("inode# file type d_reclen d_off d_name\n");
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for (bpos = 0; bpos < nread;) {
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d = (struct linux_dirent64 *) (buf + bpos);
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if (d->d_type != DT_REG)
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goto next;
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if (d->d_name[0] == '.')
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goto next;
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char *flags = strstr(d->d_name, ":2,");
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if (!flags)
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goto next;
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// if (strncmp(d->d_name, "1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1", strlen("1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1")-1))
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// goto next;
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// printf("%s\n", d->d_name);
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flagsort(flags+3);
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printf("%s\n", d->d_name);
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// if (!strchr(flags, 'S'))
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// printf("%s\n", d->d_name);
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// goto next;
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/*
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printf("%-10s ", (d_type == DT_REG) ? "regular" :
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(d_type == DT_DIR) ? "directory" :
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(d_type == DT_FIFO) ? "FIFO" :
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(d_type == DT_SOCK) ? "socket" :
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(d_type == DT_LNK) ? "symlink" :
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(d_type == DT_BLK) ? "block dev" :
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(d_type == DT_CHR) ? "char dev" : "???");
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printf("%4d %10lld %s\n", d->d_reclen,
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(long long) d->d_off, d->d_name);
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*/
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next:
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bpos += d->d_reclen;
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}
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}
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exit(EXIT_SUCCESS);
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}
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