/* touch.c : change timestamp of a file * * Copyright 2012 Choubey Ji <warior.linux@gmail.com> * * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html USE_TOUCH(NEWTOY(touch, "acd:mr:t:[!dtr]", TOYFLAG_BIN)) config TOUCH bool "touch" default y help usage: touch [-amc] [-d DATE] [-t TIME] [-r FILE] FILE... Update the access and modification times of each FILE to the current time. -a change access time -m change modification time -c don't create file -d set time to DATE (in YYYY-MM-DDThh:mm:SS[.frac][tz] format) -t set time to TIME (in [[CC]YY]MMDDhhmm[.ss][frac] format) -r set time same as reference FILE */ #define FOR_touch #include "toys.h" GLOBALS( char *time; char *file; char *date; ) // Fetch access and/or modification time of a file int fetch(char *file, struct timeval *tv, unsigned flags) { struct stat st; if (stat(TT.file, &st)) return 1; if (flags & FLAG_a) { tv[0].tv_sec = st.st_atime; tv[0].tv_usec = st.st_atim.tv_nsec/1000; } if (flags & FLAG_m) { tv[1].tv_sec = st.st_mtime; tv[1].tv_usec = st.st_mtim.tv_nsec/1000; } return 0; } void touch_main(void) { struct timeval tv[2]; struct tm tm; char **ss, *date, *s; int flag, fd, i, len; // Set time from clock? gettimeofday(tv, NULL); localtime_r(&(tv->tv_sec), &tm); // Set time from -d? if (toys.optflags & (FLAG_t|FLAG_d)) { if (toys.optflags & FLAG_d) { date = TT.date; i = strlen(date); if (i && i < sizeof(toybuf)) { // Trailing Z means UTC timezone, don't expect libc to know this. if (toupper(date[i])=='Z') { putenv("TZ=UTC"); strcpy(toybuf, date); toybuf[i] = 0; date = toybuf; gmtime_r(&(tv->tv_sec), &tm); } s = strptime(date, "%Y-%m-%dT%T", &tm); if (s && *s=='.') { sscanf(s, ".%d%n", &i, &len); s += len; tv->tv_usec = i; } } else s = 0; // Set time from -t? } else { strcpy(toybuf, "%Y%m%d%H%M"); date = TT.time; for (i=0;i<3;i++) { s = strptime(date, toybuf+(i&2), &tm); if (s) break; toybuf[1]='y'; } if (s && *s=='.') { int count = sscanf(s, ".%2d%u%n", &(tm.tm_sec), &i, &len); if (count==2) tv->tv_usec = i; s += len; } } errno = 0; tv->tv_sec = mktime(&tm); if (!s || *s || errno == EOVERFLOW) { // Warn Indiana Jones the monkey died. perror_exit("bad '%s'", date); } } tv[1]=tv[0]; // Set time from -r? if (TT.file && fetch(TT.file, tv, FLAG_a|FLAG_m)) perror_exit("-r '%s'", TT.file); // Ok, we've got a time. Flip -am flags so now it's the ones we _keep_. flag = (~toys.optflags) & (FLAG_m|FLAG_a); // Loop through files on command line for (ss=toys.optargs; *ss;) { if ((flag == (FLAG_m|FLAG_a) || !fetch(*ss, tv, flag)) && !utimes(*ss, tv)) ss++; else if (toys.optflags & FLAG_c) ss++; else if (-1 != (fd = open(*ss, O_CREAT, 0666))) close(fd); else perror_msg("'%s'", *ss++); } }