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	touch.c - sbase - suckless unix tools
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	---
	touch.c (2796B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <sys/stat.h>
	3
	4 #include <errno.h>
	5 #include <fcntl.h>
	6 #include <stdlib.h>
	7 #include <string.h>
	8 #include <time.h>
	9 #include <unistd.h>
	10
	11 #include "util.h"
	12
	13 static int aflag;
	14 static int cflag;
	15 static int mflag;
	16 static struct timespec times[2] = {{.tv_nsec = UTIME_NOW}};
	17
	18 static void
	19 touch(const char *file)
	20 {
	21 int fd, ret;
	22
	23 if (utimensat(AT_FDCWD, file, times, 0) == 0)
	24 return;
	25 if (errno != ENOENT)
	26 eprintf("utimensat %s:", file);
	27 if (cflag)
	28 return;
	29 if ((fd = open(file, O_WRONLY \| O_CREAT \| O_EXCL, 0666)) < 0)
	30 eprintf("open %s:", file);
	31 ret = futimens(fd, times);
	32 close(fd);
	33 if (ret < 0)
	34 eprintf("futimens %s:", file);
	35 }
	36
	37 static time_t
	38 parsetime(char *str)
	39 {
	40 time_t now;
	41 struct tm *cur, t = { 0 };
	42 int zulu = 0;
	43 char *format;
	44 size_t len = strlen(str);
	45
	46 if ((now = time(NULL)) == -1)
	47 eprintf("time:");
	48 if (!(cur = localtime(&now)))
	49 eprintf("localtime:");
	50 t.tm_isdst = -1;
	51
	52 switch (len) {
	53 /* -t flag argument */
	54 case 8:
	55 t.tm_year = cur->tm_year;
	56 format = "%m%d%H%M";
	57 break;
	58 case 10:
	59 format = "%y%m%d%H%M";
	60 break;
	61 case 11:
	62 t.tm_year = cur->tm_year;
	63 format = "%m%d%H%M.%S";
	64 break;
	65 case 12:
	66 format = "%Y%m%d%H%M";
	67 break;
	68 case 13:
	69 format = "%y%m%d%H%M.%S";
	70 break;
	71 case 15:
	72 format = "%Y%m%d%H%M.%S";
	73 break;
	74 /* -d flag argument */
	75 case 19:
	76 format = "%Y-%m-%dT%H:%M:%S";
	77 break;
	78 case 20:
	79 /* only Zulu-timezone supported */
	80 if (str[19] != 'Z')
	81 eprintf("Invalid time zone\n");
	82 str[19] = 0;
	83 zulu = 1;
	84 format = "%Y-%m-%dT%H:%M:%S";
	85 break;
	86 default:
	87 eprintf("Invalid date format length\n", str);
	88 }
	89
	90 if (!strptime(str, format, &t))
	91 eprintf("strptime %s: Invalid date format\n", str);
	92 if (zulu) {
	93 t.tm_hour += t.tm_gmtoff / 60;
	94 t.tm_gmtoff = 0;
	95 t.tm_zone = "Z";
	96 }
	97
	98 return mktime(&t);
	99 }
	100
	101 static void
	102 usage(void)
	103 {
	104 eprintf("usage: %s [-acm] [-d time \| -r ref_file \| -t time \| -T …
	105 "file ...\n", argv0);
	106 }
	107
	108 int
	109 main(int argc, char *argv[])
	110 {
	111 struct stat st;
	112 char *ref = NULL;
	113
	114 ARGBEGIN {
	115 case 'a':
	116 aflag = 1;
	117 break;
	118 case 'c':
	119 cflag = 1;
	120 break;
	121 case 'd':
	122 case 't':
	123 times[0].tv_sec = parsetime(EARGF(usage()));
	124 times[0].tv_nsec = 0;
	125 break;
	126 case 'm':
	127 mflag = 1;
	128 break;
	129 case 'r':
	130 ref = EARGF(usage());
	131 if (stat(ref, &st) < 0)
	132 eprintf("stat '%s':", ref);
	133 times[0] = st.st_atim;
	134 times[1] = st.st_mtim;
	135 break;
	136 case 'T':
	137 times[0].tv_sec = estrtonum(EARGF(usage()), 0, LLONG_MAX…
	138 times[0].tv_nsec = 0;
	139 break;
	140 default:
	141 usage();
	142 } ARGEND
	143
	144 if (!argc)
	145 usage();
	146 if (!aflag && !mflag)
	147 aflag = mflag = 1;
	148 if (!ref)
	149 times[1] = times[0];
	150 if (!aflag)
	151 times[0].tv_nsec = UTIME_OMIT;
	152 if (!mflag)
	153 times[1].tv_nsec = UTIME_OMIT;
	154
	155 for (; *argv; argc--, argv++)
	156 touch(*argv);
	157
	158 return 0;
	159 }