/* $NetBSD: date.c,v 1.44 2006/08/17 10:03:53 jnemeth 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 #ifndef lint __COPYRIGHT( "@(#) Copyright (c) 1985, 1987, 1988, 1993\n\ The Regents of the University of California. All rights reserved.\n"); #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95"; #else __RCSID("$NetBSD: date.c,v 1.44 2006/08/17 10:03:53 jnemeth Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "extern.h" static time_t tval; static int aflag, rflag, nflag; int retval; static void badformat(void); static void badtime(void); static void setthetime(const char *); static void usage(void); int main(int argc, char *argv[]) { char *buf; size_t bufsiz; const char *format; int ch; setprogname(argv[0]); (void)setlocale(LC_ALL, ""); while ((ch = getopt(argc, argv, "anr:u")) != -1) { switch (ch) { case 'a': /* adjust time slowly */ aflag = 1; nflag = 1; break; case 'n': /* don't set network */ nflag = 1; break; case 'r': /* user specified seconds */ rflag = 1; tval = strtol(optarg, NULL, 0); break; case 'u': /* do everything in UTC */ (void)putenv("TZ=UTC0"); break; default: usage(); } } argc -= optind; argv += optind; if (!rflag && time(&tval) == -1) err(EXIT_FAILURE, "time"); format = "%a %b %e %H:%M:%S %Z %Y"; /* allow the operands in any order */ if (*argv && **argv == '+') { format = *argv + 1; ++argv; } if (*argv) { setthetime(*argv); ++argv; } if (*argv && **argv == '+') format = *argv + 1; if ((buf = malloc(bufsiz = 1024)) == NULL) goto bad; while (strftime(buf, bufsiz, format, localtime(&tval)) == 0) if ((buf = realloc(buf, bufsiz <<= 1)) == NULL) goto bad; (void)printf("%s\n", buf); free(buf); return 0; bad: err(1, "Cannot allocate format buffer"); } static void badformat(void) { warnx("illegal time format"); usage(); } static void badtime(void) { errx(EXIT_FAILURE, "illegal time"); /* NOTREACHED */ } #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) static void setthetime(const char *p) { struct timeval tv; time_t new_time; struct tm *lt; const char *dot, *t; int len, yearset; for (t = p, dot = NULL; *t; ++t) { if (isdigit((unsigned char)*t)) continue; if (*t == '.' && dot == NULL) { dot = t; continue; } badformat(); } lt = localtime(&tval); lt->tm_isdst = -1; /* Divine correct DST */ if (dot != NULL) { /* .ss */ len = strlen(dot); if (len != 3) badformat(); ++dot; lt->tm_sec = ATOI2(dot); } else { len = 0; lt->tm_sec = 0; } yearset = 0; switch (strlen(p) - len) { case 12: /* cc */ lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE; yearset = 1; /* FALLTHROUGH */ case 10: /* yy */ if (yearset) { lt->tm_year += ATOI2(p); } else { yearset = ATOI2(p); if (yearset < 69) lt->tm_year = yearset + 2000 - TM_YEAR_BASE; else lt->tm_year = yearset + 1900 - TM_YEAR_BASE; } /* FALLTHROUGH */ case 8: /* mm */ lt->tm_mon = ATOI2(p); --lt->tm_mon; /* time struct is 0 - 11 */ /* FALLTHROUGH */ case 6: /* dd */ lt->tm_mday = ATOI2(p); /* FALLTHROUGH */ case 4: /* hh */ lt->tm_hour = ATOI2(p); /* FALLTHROUGH */ case 2: /* mm */ lt->tm_min = ATOI2(p); break; case 0: /* was just .sss */ if (len != 0) break; /* FALLTHROUGH */ default: badformat(); } /* convert broken-down time to UTC clock time */ if ((new_time = mktime(lt)) == -1) badtime(); /* set the time */ if (nflag || netsettime(new_time)) { logwtmp("|", "date", ""); if (aflag) { tv.tv_sec = new_time - tval; tv.tv_usec = 0; if (adjtime(&tv, NULL)) err(EXIT_FAILURE, "adjtime"); } else { tval = new_time; tv.tv_sec = tval; tv.tv_usec = 0; if (settimeofday(&tv, NULL)) err(EXIT_FAILURE, "settimeofday"); } logwtmp("{", "date", ""); } if ((p = getlogin()) == NULL) p = "???"; syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p); } static void usage(void) { (void)fprintf(stderr, "usage: %s [-u] [-r seconds] [+format]\n", getprogname()); (void)fprintf(stderr, " %s [-anu] [[[[[cc]yy]mm]dd]hh]mm[.ss]\n", getprogname()); exit(EXIT_FAILURE); /* NOTREACHED */ }