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	tty.c - ubase - suckless linux base utils
	git clone git://git.suckless.org/ubase
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	---
	tty.c (1717B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/sysmacros.h>
	3 #include <sys/types.h>
	4 #include <sys/stat.h>
	5
	6 #include <fcntl.h>
	7 #include <dirent.h>
	8 #include <limits.h>
	9 #include <stdio.h>
	10 #include <stdlib.h>
	11 #include <string.h>
	12 #include <unistd.h>
	13
	14 #include "../util.h"
	15
	16 void
	17 devtotty(int dev, int tty_maj, int tty_min)
	18 {
	19 *tty_maj = (dev >> 8) & 0xfff;
	20 *tty_min = (dev & 0xff) \| ((dev >> 12) & 0xfff00);
	21 }
	22
	23 int
	24 ttytostr(int tty_maj, int tty_min, char *str, size_t n)
	25 {
	26 struct stat sb;
	27 struct dirent *dp;
	28 DIR *dirp;
	29 char path[PATH_MAX];
	30 int fd;
	31 int r = 0;
	32
	33 switch (tty_maj) {
	34 case 136:
	35 snprintf(str, n, "pts/%d", tty_min);
	36 return 0;
	37 case 4:
	38 snprintf(str, n, "tty%d", tty_min);
	39 return 0;
	40 default:
	41 str[0] = '?';
	42 str[1] = '\0';
	43 break;
	44 }
	45
	46 dirp = opendir("/dev");
	47 if (!dirp) {
	48 weprintf("opendir /dev:");
	49 return -1;
	50 }
	51
	52 while ((dp = readdir(dirp))) {
	53 if (!strcmp(dp->d_name, ".") \|\|
	54 !strcmp(dp->d_name, ".."))
	55 continue;
	56
	57 if (strlcpy(path, "/dev/", sizeof(path)) >= sizeof(path)…
	58 weprintf("path too long\n");
	59 r = -1;
	60 goto err0;
	61 }
	62 if (strlcat(path, dp->d_name, sizeof(path)) >= sizeof(pa…
	63 weprintf("path too long\n");
	64 r = -1;
	65 goto err0;
	66 }
	67
	68 if (stat(path, &sb) < 0) {
	69 weprintf("stat %s:", path);
	70 r = -1;
	71 goto err0;
	72 }
	73
	74 if ((int)major(sb.st_rdev) == tty_maj &&
	75 (int)minor(sb.st_rdev) == tty_min) {
	76 fd = open(path, O_RDONLY \| O_NONBLOCK);
	77 if (fd < 0)
	78 continue;
	79 if (isatty(fd)) {
	80 strlcpy(str, dp->d_name, n);
	81 close(fd);
	82 break;
	83 } else {
	84 close(fd);
	85 r = -1;
	86 goto err0;
	87 }
	88 }
	89 }
	90
	91 err0:
	92 if (closedir(dirp) < 0) {
	93 weprintf("closedir /dev:");
	94 r = -1;
	95 }
	96
	97 return r;
	98 }