Index: icu46/source/tools/tzcode/asctime.c |
=================================================================== |
--- icu46/source/tools/tzcode/asctime.c (revision 0) |
+++ icu46/source/tools/tzcode/asctime.c (revision 0) |
@@ -0,0 +1,138 @@ |
+/* |
+** This file is in the public domain, so clarified as of |
+** 1996-06-05 by Arthur David Olson. |
+*/ |
+ |
+/* |
+** Avoid the temptation to punt entirely to strftime; |
+** the output of strftime is supposed to be locale specific |
+** whereas the output of asctime is supposed to be constant. |
+*/ |
+ |
+#ifndef lint |
+#ifndef NOID |
+static char elsieid[] = "@(#)asctime.c 8.2"; |
+#endif /* !defined NOID */ |
+#endif /* !defined lint */ |
+ |
+/*LINTLIBRARY*/ |
+ |
+#include "private.h" |
+#include "tzfile.h" |
+ |
+/* |
+** Some systems only handle "%.2d"; others only handle "%02d"; |
+** "%02.2d" makes (most) everybody happy. |
+** At least some versions of gcc warn about the %02.2d; |
+** we conditionalize below to avoid the warning. |
+*/ |
+/* |
+** All years associated with 32-bit time_t values are exactly four digits long; |
+** some years associated with 64-bit time_t values are not. |
+** Vintage programs are coded for years that are always four digits long |
+** and may assume that the newline always lands in the same place. |
+** For years that are less than four digits, we pad the output with |
+** leading zeroes to get the newline in the traditional place. |
+** The -4 ensures that we get four characters of output even if |
+** we call a strftime variant that produces fewer characters for some years. |
+** The ISO C 1999 and POSIX 1003.1-2004 standards prohibit padding the year, |
+** but many implementations pad anyway; most likely the standards are buggy. |
+*/ |
+#ifdef __GNUC__ |
+#define ASCTIME_FMT "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %-4s\n" |
+#else /* !defined __GNUC__ */ |
+#define ASCTIME_FMT "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %-4s\n" |
+#endif /* !defined __GNUC__ */ |
+/* |
+** For years that are more than four digits we put extra spaces before the year |
+** so that code trying to overwrite the newline won't end up overwriting |
+** a digit within a year and truncating the year (operating on the assumption |
+** that no output is better than wrong output). |
+*/ |
+#ifdef __GNUC__ |
+#define ASCTIME_FMT_B "%.3s %.3s%3d %2.2d:%2.2d:%2.2d %s\n" |
+#else /* !defined __GNUC__ */ |
+#define ASCTIME_FMT_B "%.3s %.3s%3d %02.2d:%02.2d:%02.2d %s\n" |
+#endif /* !defined __GNUC__ */ |
+ |
+#define STD_ASCTIME_BUF_SIZE 26 |
+/* |
+** Big enough for something such as |
+** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n |
+** (two three-character abbreviations, five strings denoting integers, |
+** seven explicit spaces, two explicit colons, a newline, |
+** and a trailing ASCII nul). |
+** The values above are for systems where an int is 32 bits and are provided |
+** as an example; the define below calculates the maximum for the system at |
+** hand. |
+*/ |
+#define MAX_ASCTIME_BUF_SIZE (2*3+5*INT_STRLEN_MAXIMUM(int)+7+2+1+1) |
+ |
+static char buf_asctime[MAX_ASCTIME_BUF_SIZE]; |
+ |
+/* |
+** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition. |
+*/ |
+ |
+char * |
+asctime_r(timeptr, buf) |
+register const struct tm * timeptr; |
+char * buf; |
+{ |
+ static const char wday_name[][3] = { |
+ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" |
+ }; |
+ static const char mon_name[][3] = { |
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" |
+ }; |
+ register const char * wn; |
+ register const char * mn; |
+ char year[INT_STRLEN_MAXIMUM(int) + 2]; |
+ char result[MAX_ASCTIME_BUF_SIZE]; |
+ |
+ if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK) |
+ wn = "???"; |
+ else wn = wday_name[timeptr->tm_wday]; |
+ if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR) |
+ mn = "???"; |
+ else mn = mon_name[timeptr->tm_mon]; |
+ /* |
+ ** Use strftime's %Y to generate the year, to avoid overflow problems |
+ ** when computing timeptr->tm_year + TM_YEAR_BASE. |
+ ** Assume that strftime is unaffected by other out-of-range members |
+ ** (e.g., timeptr->tm_mday) when processing "%Y". |
+ */ |
+ (void) strftime(year, sizeof year, "%Y", timeptr); |
+ /* |
+ ** We avoid using snprintf since it's not available on all systems. |
+ */ |
+ (void) sprintf(result, |
+ ((strlen(year) <= 4) ? ASCTIME_FMT : ASCTIME_FMT_B), |
+ wn, mn, |
+ timeptr->tm_mday, timeptr->tm_hour, |
+ timeptr->tm_min, timeptr->tm_sec, |
+ year); |
+ if (strlen(result) < STD_ASCTIME_BUF_SIZE || buf == buf_asctime) { |
+ (void) strcpy(buf, result); |
+ return buf; |
+ } else { |
+#ifdef EOVERFLOW |
+ errno = EOVERFLOW; |
+#else /* !defined EOVERFLOW */ |
+ errno = EINVAL; |
+#endif /* !defined EOVERFLOW */ |
+ return NULL; |
+ } |
+} |
+ |
+/* |
+** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, 2004 Edition. |
+*/ |
+ |
+char * |
+asctime(timeptr) |
+register const struct tm * timeptr; |
+{ |
+ return asctime_r(timeptr, buf_asctime); |
+} |
Property changes on: icu46/source/tools/tzcode/asctime.c |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |