| /* |
| ** 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. |
| */ |
| |
| /*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(register const struct tm *timeptr, char *buf) |
| { |
| // ARC MOD BEGIN UPSTREAM bionic-fix-time-array-size |
| // Correct the array size from [3] to [4]. Otherwise nacl-gcc misbehaves |
| // on x86_64 opt build. |
| static const char wday_name[][4] = { |
| // ARC MOD END UPSTREAM |
| "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" |
| }; |
| // ARC MOD BEGIN UPSTREAM bionic-fix-time-array-size |
| // The same as above. |
| static const char mon_name[][4] = { |
| // ARC MOD END UPSTREAM |
| "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 == NULL) { |
| errno = EINVAL; |
| return strcpy(buf, "??? ??? ?? ??:??:?? ????\n"); |
| } |
| 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) |
| return strcpy(buf, result); |
| 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(register const struct tm *timeptr) |
| { |
| return asctime_r(timeptr, buf_asctime); |
| } |