1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/intl/icu/source/tools/tzcode/asctime.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,138 @@
1.4 +/*
1.5 +** This file is in the public domain, so clarified as of
1.6 +** 1996-06-05 by Arthur David Olson.
1.7 +*/
1.8 +
1.9 +/*
1.10 +** Avoid the temptation to punt entirely to strftime;
1.11 +** the output of strftime is supposed to be locale specific
1.12 +** whereas the output of asctime is supposed to be constant.
1.13 +*/
1.14 +
1.15 +#ifndef lint
1.16 +#ifndef NOID
1.17 +static char elsieid[] = "@(#)asctime.c 8.2";
1.18 +#endif /* !defined NOID */
1.19 +#endif /* !defined lint */
1.20 +
1.21 +/*LINTLIBRARY*/
1.22 +
1.23 +#include "private.h"
1.24 +#include "tzfile.h"
1.25 +
1.26 +/*
1.27 +** Some systems only handle "%.2d"; others only handle "%02d";
1.28 +** "%02.2d" makes (most) everybody happy.
1.29 +** At least some versions of gcc warn about the %02.2d;
1.30 +** we conditionalize below to avoid the warning.
1.31 +*/
1.32 +/*
1.33 +** All years associated with 32-bit time_t values are exactly four digits long;
1.34 +** some years associated with 64-bit time_t values are not.
1.35 +** Vintage programs are coded for years that are always four digits long
1.36 +** and may assume that the newline always lands in the same place.
1.37 +** For years that are less than four digits, we pad the output with
1.38 +** leading zeroes to get the newline in the traditional place.
1.39 +** The -4 ensures that we get four characters of output even if
1.40 +** we call a strftime variant that produces fewer characters for some years.
1.41 +** The ISO C 1999 and POSIX 1003.1-2004 standards prohibit padding the year,
1.42 +** but many implementations pad anyway; most likely the standards are buggy.
1.43 +*/
1.44 +#ifdef __GNUC__
1.45 +#define ASCTIME_FMT "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %-4s\n"
1.46 +#else /* !defined __GNUC__ */
1.47 +#define ASCTIME_FMT "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %-4s\n"
1.48 +#endif /* !defined __GNUC__ */
1.49 +/*
1.50 +** For years that are more than four digits we put extra spaces before the year
1.51 +** so that code trying to overwrite the newline won't end up overwriting
1.52 +** a digit within a year and truncating the year (operating on the assumption
1.53 +** that no output is better than wrong output).
1.54 +*/
1.55 +#ifdef __GNUC__
1.56 +#define ASCTIME_FMT_B "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %s\n"
1.57 +#else /* !defined __GNUC__ */
1.58 +#define ASCTIME_FMT_B "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %s\n"
1.59 +#endif /* !defined __GNUC__ */
1.60 +
1.61 +#define STD_ASCTIME_BUF_SIZE 26
1.62 +/*
1.63 +** Big enough for something such as
1.64 +** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
1.65 +** (two three-character abbreviations, five strings denoting integers,
1.66 +** seven explicit spaces, two explicit colons, a newline,
1.67 +** and a trailing ASCII nul).
1.68 +** The values above are for systems where an int is 32 bits and are provided
1.69 +** as an example; the define below calculates the maximum for the system at
1.70 +** hand.
1.71 +*/
1.72 +#define MAX_ASCTIME_BUF_SIZE (2*3+5*INT_STRLEN_MAXIMUM(int)+7+2+1+1)
1.73 +
1.74 +static char buf_asctime[MAX_ASCTIME_BUF_SIZE];
1.75 +
1.76 +/*
1.77 +** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
1.78 +*/
1.79 +
1.80 +char *
1.81 +asctime_r(timeptr, buf)
1.82 +register const struct tm * timeptr;
1.83 +char * buf;
1.84 +{
1.85 + static const char wday_name[][3] = {
1.86 + "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
1.87 + };
1.88 + static const char mon_name[][3] = {
1.89 + "Jan", "Feb", "Mar", "Apr", "May", "Jun",
1.90 + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
1.91 + };
1.92 + register const char * wn;
1.93 + register const char * mn;
1.94 + char year[INT_STRLEN_MAXIMUM(int) + 2];
1.95 + char result[MAX_ASCTIME_BUF_SIZE];
1.96 +
1.97 + if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
1.98 + wn = "???";
1.99 + else wn = wday_name[timeptr->tm_wday];
1.100 + if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
1.101 + mn = "???";
1.102 + else mn = mon_name[timeptr->tm_mon];
1.103 + /*
1.104 + ** Use strftime's %Y to generate the year, to avoid overflow problems
1.105 + ** when computing timeptr->tm_year + TM_YEAR_BASE.
1.106 + ** Assume that strftime is unaffected by other out-of-range members
1.107 + ** (e.g., timeptr->tm_mday) when processing "%Y".
1.108 + */
1.109 + (void) strftime(year, sizeof year, "%Y", timeptr);
1.110 + /*
1.111 + ** We avoid using snprintf since it's not available on all systems.
1.112 + */
1.113 + (void) sprintf(result,
1.114 + ((strlen(year) <= 4) ? ASCTIME_FMT : ASCTIME_FMT_B),
1.115 + wn, mn,
1.116 + timeptr->tm_mday, timeptr->tm_hour,
1.117 + timeptr->tm_min, timeptr->tm_sec,
1.118 + year);
1.119 + if (strlen(result) < STD_ASCTIME_BUF_SIZE || buf == buf_asctime) {
1.120 + (void) strcpy(buf, result);
1.121 + return buf;
1.122 + } else {
1.123 +#ifdef EOVERFLOW
1.124 + errno = EOVERFLOW;
1.125 +#else /* !defined EOVERFLOW */
1.126 + errno = EINVAL;
1.127 +#endif /* !defined EOVERFLOW */
1.128 + return NULL;
1.129 + }
1.130 +}
1.131 +
1.132 +/*
1.133 +** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition.
1.134 +*/
1.135 +
1.136 +char *
1.137 +asctime(timeptr)
1.138 +register const struct tm * timeptr;
1.139 +{
1.140 + return asctime_r(timeptr, buf_asctime);
1.141 +}
