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	mountpoint.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	mountpoint.c (1668B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3 #include <sys/sysmacros.h>
	4 #include <sys/types.h>
	5
	6 #include <mntent.h>
	7 #include <stdio.h>
	8 #include <stdlib.h>
	9 #include <string.h>
	10 #include <unistd.h>
	11
	12 #include "util.h"
	13
	14 static void
	15 usage(void)
	16 {
	17 eprintf("usage: %s [-dqx] target\n", argv0);
	18 }
	19
	20 int
	21 main(int argc, char *argv[])
	22 {
	23 int dflag = 0, qflag = 0, xflag = 0;
	24 int ret = 0;
	25 struct mntent *me = NULL;
	26 FILE *fp;
	27 struct stat st1, st2;
	28
	29 ARGBEGIN {
	30 case 'd':
	31 dflag = 1;
	32 break;
	33 case 'q':
	34 qflag = 1;
	35 break;
	36 case 'x':
	37 xflag = 1;
	38 break;
	39 default:
	40 usage();
	41 } ARGEND;
	42
	43 if (argc < 1)
	44 usage();
	45
	46 if (stat(argv[0], &st1) < 0) {
	47 if (qflag)
	48 return 1;
	49 eprintf("stat %s:", argv[0]);
	50 }
	51
	52 if (xflag) {
	53 if (!S_ISBLK(st1.st_mode)) {
	54 if (qflag)
	55 return 1;
	56 eprintf("stat: %s: not a block device\n",
	57 argv[0]);
	58 }
	59 printf("%u:%u\n", major(st1.st_rdev),
	60 minor(st1.st_rdev));
	61 return 0;
	62 }
	63
	64 if (!S_ISDIR(st1.st_mode)) {
	65 if (qflag)
	66 return 1;
	67 eprintf("stat %s: not a directory\n", argv[0]);
	68 }
	69
	70 if (dflag) {
	71 printf("%u:%u\n", major(st1.st_dev),
	72 minor(st1.st_dev));
	73 return 0;
	74 }
	75
	76 fp = setmntent("/proc/mounts", "r");
	77 if (!fp) {
	78 if (qflag)
	79 return 1;
	80 eprintf("setmntent %s:", "/proc/mounts");
	81 }
	82 while ((me = getmntent(fp)) != NULL) {
	83 if (stat(me->mnt_dir, &st2) < 0) {
	84 if (qflag)
	85 return 1;
	86 eprintf("stat %s:", me->mnt_dir);
	87 }
	88 if (st1.st_dev == st2.st_dev &&
	89 st1.st_ino == st2.st_ino)
	90 break;
	91 }
	92 endmntent(fp);
	93
	94 if (me == NULL)
	95 ret = 1;
	96
	97 if (!qflag)
	98 printf("%s %s a mountpoint\n", argv[0],
	99 !ret ? "is" : "is not");
	100
	101 return ret;
	102 }