/* $OpenBSD: date.c,v 1.57 2021/08/11 13:41:48 schwarze Exp $ */ /* $NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc Exp $ */ /* * Copyright (c) 1985, 1987, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include extern char *__progname; time_t tval; int jflag; int slidetime; static void setthetime(char *, const char *); static void badformat(void); static void __dead usage(void); int main(int argc, char *argv[]) { const char *errstr; struct tm *tp; int ch, rflag; char *format, buf[1024], *outzone = NULL; const char *pformat = NULL; rflag = 0; while ((ch = getopt(argc, argv, "af:jr:uz:")) != -1) switch(ch) { case 'a': slidetime = 1; break; case 'f': /* parse with strptime */ pformat = optarg; break; case 'j': /* don't set */ jflag = 1; break; case 'r': /* user specified seconds */ rflag = 1; tval = strtonum(optarg, LLONG_MIN, LLONG_MAX, &errstr); if (errstr) errx(1, "seconds is %s: %s", errstr, optarg); break; case 'u': /* do everything in UTC */ if (setenv("TZ", "UTC", 1) == -1) err(1, "cannot unsetenv TZ"); break; case 'z': outzone = optarg; break; default: usage(); } argc -= optind; argv += optind; if (!rflag && time(&tval) == -1) err(1, "time"); format = "%a %b %e %H:%M:%S %Z %Y"; /* allow the operands in any order */ if (*argv && **argv == '+') { format = *argv + 1; argv++; argc--; } if (*argv) { setthetime(*argv, pformat); argv++; argc--; } if (pledge("stdio rpath", NULL) == -1) err(1, "pledge"); if (*argv && **argv == '+') { format = *argv + 1; argc--; } if (argc > 0) errx(1, "too many arguments"); if (outzone) setenv("TZ", outzone, 1); tp = localtime(&tval); if (tp == NULL) errx(1, "conversion error"); (void)strftime(buf, sizeof(buf), format, tp); (void)printf("%s\n", buf); return 0; } #define ATOI2(ar) ((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0')) void setthetime(char *p, const char *pformat) { struct tm *lt, tm; struct timeval tv; char *dot, *t; time_t now; int yearset = 0; if (pledge("stdio settime rpath wpath", NULL) == -1) err(1, "pledge"); lt = localtime(&tval); lt->tm_isdst = -1; /* correct for DST */ if (pformat) { tm = *lt; if (strptime(p, pformat, &tm) == NULL) { fprintf(stderr, "trouble %s %s\n", p, pformat); badformat(); } lt = &tm; } else { for (t = p, dot = NULL; *t; ++t) { if (isdigit((unsigned char)*t)) continue; if (*t == '.' && dot == NULL) { dot = t; continue; } badformat(); } if (dot != NULL) { /* .SS */ *dot++ = '\0'; if (strlen(dot) != 2) badformat(); lt->tm_sec = ATOI2(dot); if (lt->tm_sec > 61) badformat(); } else lt->tm_sec = 0; switch (strlen(p)) { case 12: /* cc */ lt->tm_year = (ATOI2(p) * 100) - 1900; yearset = 1; /* FALLTHROUGH */ case 10: /* yy */ if (!yearset) { /* mask out current year, leaving only century */ lt->tm_year = ((lt->tm_year / 100) * 100); } lt->tm_year += ATOI2(p); /* FALLTHROUGH */ case 8: /* mm */ lt->tm_mon = ATOI2(p); if ((lt->tm_mon > 12) || !lt->tm_mon) badformat(); --lt->tm_mon; /* time struct is 0 - 11 */ /* FALLTHROUGH */ case 6: /* dd */ lt->tm_mday = ATOI2(p); if ((lt->tm_mday > 31) || !lt->tm_mday) badformat(); /* FALLTHROUGH */ case 4: /* HH */ lt->tm_hour = ATOI2(p); if (lt->tm_hour > 23) badformat(); /* FALLTHROUGH */ case 2: /* MM */ lt->tm_min = ATOI2(p); if (lt->tm_min > 59) badformat(); break; default: badformat(); } } /* convert broken-down time to UTC clock time */ if (pformat != NULL && strstr(pformat, "%s") != NULL) tval = timegm(lt); else tval = mktime(lt); if (tval == -1) errx(1, "specified date is outside allowed range"); if (jflag) return; /* set the time */ if (slidetime) { if ((now = time(NULL)) == -1) err(1, "time"); tv.tv_sec = tval - now; tv.tv_usec = 0; if (adjtime(&tv, NULL) == -1) err(1, "adjtime"); } else { #ifndef SMALL logwtmp("|", "date", ""); #endif tv.tv_sec = tval; tv.tv_usec = 0; if (settimeofday(&tv, NULL)) err(1, "settimeofday"); #ifndef SMALL logwtmp("{", "date", ""); #endif } if ((p = getlogin()) == NULL) p = "???"; syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); } static void badformat(void) { warnx("illegal time format"); usage(); } static void __dead usage(void) { fprintf(stderr, "usage: %s [-aju] [-f pformat] [-r seconds]\n" "\t[-z output_zone] [+format] [[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n", __progname); exit(1); }