f8768d2a1a
asctime.c: * Set errno to EINVAL and return "??? ??? ?? ??:??:?? ????\n" if asctime_r is called with a NULL struct tm pointer. (Note that asctime_r is called by ctime_r and asctime; asctime is called by ctime.) localtime.c: * Set errno to EINVAL and return WRONG if time1 is called with a NULL struct tm pointer; avoid dereference if a NULL struct tm pointer is passed to timelocal, timegm, or timeoff. (Note that time1 is called by mktime, timegm, and timeoff; mktime is called by timelocal.) * more core-avoidance work * Change to set timezone and altzone based on time types with greatest transition times (for the benefit of Asia/Seoul). zic.8: * Warning about case-sensitivity of names, but not of abbrevations zic.c: * Conditionally output extra types with most-recently-use offsets last (for use by systems with pre-2011 versions of localtime.c, helping to ensure that globals "altzone and "timezone" get set correctly). The code has been running for nearly four weeks on my laptop running FreeBSD 8.1 without a problem. MFC after: 1 month
146 lines
4.4 KiB
C
146 lines
4.4 KiB
C
/*
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** This file is in the public domain, so clarified as of
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** 1996-06-05 by Arthur David Olson.
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*/
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/*
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** Avoid the temptation to punt entirely to strftime;
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** the output of strftime is supposed to be locale specific
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** whereas the output of asctime is supposed to be constant.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#ifndef NOID
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static char elsieid[] __unused = "@(#)asctime.c 8.5";
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#endif /* !defined NOID */
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#endif /* !defined lint */
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__FBSDID("$FreeBSD$");
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/*LINTLIBRARY*/
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#include "namespace.h"
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#include "private.h"
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#include "un-namespace.h"
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#include "tzfile.h"
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/*
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** Some systems only handle "%.2d"; others only handle "%02d";
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** "%02.2d" makes (most) everybody happy.
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** At least some versions of gcc warn about the %02.2d;
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** we conditionalize below to avoid the warning.
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*/
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/*
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** All years associated with 32-bit time_t values are exactly four digits long;
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** some years associated with 64-bit time_t values are not.
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** Vintage programs are coded for years that are always four digits long
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** and may assume that the newline always lands in the same place.
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** For years that are less than four digits, we pad the output with
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** leading zeroes to get the newline in the traditional place.
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** The -4 ensures that we get four characters of output even if
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** we call a strftime variant that produces fewer characters for some years.
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** The ISO C 1999 and POSIX 1003.1-2004 standards prohibit padding the year,
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** but many implementations pad anyway; most likely the standards are buggy.
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*/
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#ifdef __GNUC__
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#define ASCTIME_FMT "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %-4s\n"
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#else /* !defined __GNUC__ */
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#define ASCTIME_FMT "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %-4s\n"
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#endif /* !defined __GNUC__ */
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/*
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** For years that are more than four digits we put extra spaces before the year
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** so that code trying to overwrite the newline won't end up overwriting
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** a digit within a year and truncating the year (operating on the assumption
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** that no output is better than wrong output).
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*/
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#ifdef __GNUC__
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#define ASCTIME_FMT_B "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %s\n"
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#else /* !defined __GNUC__ */
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#define ASCTIME_FMT_B "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %s\n"
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#endif /* !defined __GNUC__ */
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#define STD_ASCTIME_BUF_SIZE 26
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/*
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** Big enough for something such as
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** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
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** (two three-character abbreviations, five strings denoting integers,
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** seven explicit spaces, two explicit colons, a newline,
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** and a trailing ASCII nul).
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** The values above are for systems where an int is 32 bits and are provided
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** as an example; the define below calculates the maximum for the system at
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** hand.
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*/
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#define MAX_ASCTIME_BUF_SIZE (2*3+5*INT_STRLEN_MAXIMUM(int)+7+2+1+1)
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static char buf_asctime[MAX_ASCTIME_BUF_SIZE];
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/*
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** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
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*/
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char *
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asctime_r(timeptr, buf)
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const struct tm * timeptr;
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char * buf;
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{
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static const char wday_name[][3] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
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};
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static const char mon_name[][3] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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const char * wn;
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const char * mn;
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char year[INT_STRLEN_MAXIMUM(int) + 2];
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char result[MAX_ASCTIME_BUF_SIZE];
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if (timeptr == NULL) {
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errno = EINVAL;
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return strcpy(buf, "??? ??? ?? ??:??:?? ????\n");
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}
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if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
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wn = "???";
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else wn = wday_name[timeptr->tm_wday];
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if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
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mn = "???";
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else mn = mon_name[timeptr->tm_mon];
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/*
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** Use strftime's %Y to generate the year, to avoid overflow problems
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** when computing timeptr->tm_year + TM_YEAR_BASE.
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** Assume that strftime is unaffected by other out-of-range members
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** (e.g., timeptr->tm_mday) when processing "%Y".
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*/
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(void) strftime(year, sizeof year, "%Y", timeptr);
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/*
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** We avoid using snprintf since it's not available on all systems.
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*/
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(void) sprintf(result,
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((strlen(year) <= 4) ? ASCTIME_FMT : ASCTIME_FMT_B),
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wn, mn,
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timeptr->tm_mday, timeptr->tm_hour,
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timeptr->tm_min, timeptr->tm_sec,
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year);
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if (strlen(result) < STD_ASCTIME_BUF_SIZE || buf == buf_asctime)
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return strcpy(buf, result);
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else {
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#ifdef EOVERFLOW
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errno = EOVERFLOW;
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#else /* !defined EOVERFLOW */
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errno = EINVAL;
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#endif /* !defined EOVERFLOW */
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return NULL;
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}
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}
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/*
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** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
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*/
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char *
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asctime(timeptr)
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const struct tm * timeptr;
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{
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return asctime_r(timeptr, buf_asctime);
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}
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