[f017df0] | 1 | /* |
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| 2 | * strftime.c |
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| 3 | * |
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| 4 | * Public-domain relatively quick-and-dirty implemenation of |
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| 5 | * ANSI library routine for System V Unix systems. |
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| 6 | * |
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| 7 | * It's written in old-style C for maximal portability. |
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| 8 | * However, since I'm used to prototypes, I've included them too. |
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| 9 | * |
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| 10 | * If you want stuff in the System V ascftime routine, add the SYSV_EXT define. |
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| 11 | * For stuff needed to implement the P1003.2 date command, add POSIX2_DATE. |
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| 12 | * For complete POSIX semantics, add POSIX_SEMANTICS. |
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| 13 | * |
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| 14 | * The code for %c, %x, and %X is my best guess as to what's "appropriate". |
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| 15 | * This version ignores LOCALE information. |
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| 16 | * It also doesn't worry about multi-byte characters. |
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| 17 | * So there. |
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| 18 | * |
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| 19 | * Arnold Robbins |
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| 20 | * January, February, March, 1991 |
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| 21 | * Updated March 1992 |
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| 22 | * |
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| 23 | * Fixes from ado@elsie.nci.nih.gov |
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| 24 | * February 1991 |
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[3d658d0] | 25 | * |
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| 26 | * Fixed compiler warnings from GCC |
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| 27 | * Olly Betts 2005-01-12 |
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[44314a0] | 28 | * |
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| 29 | * Fix memory leak if realloc() fails |
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| 30 | * Olly Betts 2010-12-21 |
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| 31 | * |
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| 32 | * Fix compilation error with GCC |
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| 33 | * Olly Betts 2010-12-21 |
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[f017df0] | 34 | */ |
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| 35 | |
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| 36 | #include <stdio.h> |
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| 37 | #include <ctype.h> |
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| 38 | #include <string.h> |
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| 39 | #include <time.h> |
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| 40 | #include <sys/types.h> |
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| 41 | |
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| 42 | #ifndef __STDC__ |
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| 43 | #define const /**/ |
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| 44 | |
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| 45 | extern void *malloc(); |
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| 46 | extern void *realloc(); |
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[44314a0] | 47 | extern void free(); |
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[f017df0] | 48 | extern void tzset(); |
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| 49 | extern char *strchr(); |
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| 50 | extern char *getenv(); |
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| 51 | static int weeknumber(); |
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| 52 | #else |
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[44314a0] | 53 | #include <stdlib.h> |
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[f017df0] | 54 | extern void tzset(void); |
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| 55 | static int weeknumber(const struct tm *timeptr, int firstweekday); |
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| 56 | #endif |
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| 57 | |
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| 58 | #ifdef __GNUC__ |
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| 59 | #define inline __inline__ |
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| 60 | #else |
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| 61 | #define inline /**/ |
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| 62 | #endif |
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| 63 | |
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| 64 | #define range(low, item, hi) max(low, min(item, hi)) |
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| 65 | |
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| 66 | extern char *tzname[2]; |
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| 67 | extern int daylight; |
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| 68 | |
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| 69 | #define SYSV_EXT 1 /* stuff in System V ascftime routine */ |
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| 70 | #define POSIX2_DATE 1 /* stuff in Posix 1003.2 date command */ |
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| 71 | #define VMS_EXT 1 /* include %V for VMS date format */ |
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| 72 | #define POSIX_SEMANTICS 1 /* call tzset() if TZ changes */ |
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| 73 | |
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| 74 | #if defined(POSIX2_DATE) && ! defined(SYSV_EXT) |
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| 75 | #define SYSV_EXT 1 |
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| 76 | #endif |
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| 77 | |
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| 78 | /* min --- return minimum of two numbers */ |
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| 79 | |
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| 80 | #ifndef __STDC__ |
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| 81 | static inline int |
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| 82 | min(a, b) |
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| 83 | int a, b; |
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| 84 | #else |
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| 85 | static inline int |
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| 86 | min(int a, int b) |
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| 87 | #endif |
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| 88 | { |
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| 89 | return (a < b ? a : b); |
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| 90 | } |
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| 91 | |
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| 92 | /* max --- return maximum of two numbers */ |
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| 93 | |
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| 94 | #ifndef __STDC__ |
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| 95 | static inline int |
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| 96 | max(a, b) |
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| 97 | int a, b; |
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| 98 | #else |
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| 99 | static inline int |
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| 100 | max(int a, int b) |
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| 101 | #endif |
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| 102 | { |
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| 103 | return (a > b ? a : b); |
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| 104 | } |
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| 105 | |
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| 106 | /* strftime --- produce formatted time */ |
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| 107 | |
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| 108 | #ifndef __STDC__ |
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| 109 | size_t |
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| 110 | strftime(s, maxsize, format, timeptr) |
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| 111 | char *s; |
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| 112 | size_t maxsize; |
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| 113 | const char *format; |
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| 114 | const struct tm *timeptr; |
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| 115 | #else |
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| 116 | size_t |
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| 117 | strftime(char *s, size_t maxsize, const char *format, const struct tm *timeptr) |
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| 118 | #endif |
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| 119 | { |
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| 120 | char *endp = s + maxsize; |
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| 121 | char *start = s; |
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| 122 | char tbuf[100]; |
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| 123 | int i; |
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| 124 | static short first = 1; |
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[3d658d0] | 125 | static char *savetz = NULL; |
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[f017df0] | 126 | static int savetzlen = 0; |
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| 127 | char *tz; |
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| 128 | int tzlen; |
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| 129 | |
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| 130 | /* various tables, useful in North America */ |
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[3d658d0] | 131 | static const char *days_a[] = { |
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[f017df0] | 132 | "Sun", "Mon", "Tue", "Wed", |
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| 133 | "Thu", "Fri", "Sat", |
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| 134 | }; |
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[3d658d0] | 135 | static const char *days_l[] = { |
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[f017df0] | 136 | "Sunday", "Monday", "Tuesday", "Wednesday", |
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| 137 | "Thursday", "Friday", "Saturday", |
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| 138 | }; |
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[3d658d0] | 139 | static const char *months_a[] = { |
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[f017df0] | 140 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", |
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| 141 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec", |
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| 142 | }; |
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[3d658d0] | 143 | static const char *months_l[] = { |
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[f017df0] | 144 | "January", "February", "March", "April", |
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| 145 | "May", "June", "July", "August", "September", |
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| 146 | "October", "November", "December", |
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| 147 | }; |
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[3d658d0] | 148 | static const char *ampm[] = { "AM", "PM", }; |
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[f017df0] | 149 | |
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| 150 | if (s == NULL || format == NULL || timeptr == NULL || maxsize == 0) |
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| 151 | return 0; |
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| 152 | |
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| 153 | if (strchr(format, '%') == NULL && strlen(format) + 1 >= maxsize) |
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| 154 | return 0; |
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| 155 | |
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| 156 | #ifndef POSIX_SEMANTICS |
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| 157 | if (first) { |
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| 158 | tzset(); |
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| 159 | first = 0; |
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| 160 | } |
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| 161 | #else /* POSIX_SEMANTICS */ |
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| 162 | tz = getenv("TZ"); |
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| 163 | tzlen = strlen(tz); |
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| 164 | if (first) { |
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| 165 | if (tz != NULL) { |
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| 166 | savetz = (char *) malloc(tzlen + 1); |
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| 167 | if (savetz != NULL) { |
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| 168 | savetzlen = tzlen + 1; |
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| 169 | strcpy(savetz, tz); |
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| 170 | } |
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| 171 | } |
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| 172 | tzset(); |
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| 173 | first = 0; |
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| 174 | } |
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| 175 | /* if we have a saved TZ, and it is different, recapture and reset */ |
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| 176 | if (tz && savetz && (tz[0] != savetz[0] || strcmp(tz, savetz) != 0)) { |
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| 177 | i = strlen(tz) + 1; |
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| 178 | if (i > savetzlen) { |
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[8ba2767] | 179 | char * newsavetz = (char *) realloc(savetz, i); |
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| 180 | if (newsavetz) { |
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[f017df0] | 181 | savetzlen = i; |
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[8ba2767] | 182 | strcpy(newsavetz, tz); |
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| 183 | } else { |
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| 184 | free(savetz); |
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[f017df0] | 185 | } |
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[8ba2767] | 186 | savetz = newsavetz; |
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[f017df0] | 187 | } else |
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| 188 | strcpy(savetz, tz); |
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| 189 | tzset(); |
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| 190 | } |
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| 191 | #endif /* POSIX_SEMANTICS */ |
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| 192 | |
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| 193 | for (; *format && s < endp - 1; format++) { |
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| 194 | tbuf[0] = '\0'; |
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| 195 | if (*format != '%') { |
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| 196 | *s++ = *format; |
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| 197 | continue; |
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| 198 | } |
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| 199 | again: |
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| 200 | switch (*++format) { |
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| 201 | case '\0': |
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| 202 | *s++ = '%'; |
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| 203 | goto out; |
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| 204 | |
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| 205 | case '%': |
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| 206 | *s++ = '%'; |
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| 207 | continue; |
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| 208 | |
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| 209 | case 'a': /* abbreviated weekday name */ |
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| 210 | if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) |
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| 211 | strcpy(tbuf, "?"); |
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| 212 | else |
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| 213 | strcpy(tbuf, days_a[timeptr->tm_wday]); |
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| 214 | break; |
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| 215 | |
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| 216 | case 'A': /* full weekday name */ |
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| 217 | if (timeptr->tm_wday < 0 || timeptr->tm_wday > 6) |
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| 218 | strcpy(tbuf, "?"); |
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| 219 | else |
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| 220 | strcpy(tbuf, days_l[timeptr->tm_wday]); |
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| 221 | break; |
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| 222 | |
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| 223 | #ifdef SYSV_EXT |
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| 224 | case 'h': /* abbreviated month name */ |
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| 225 | #endif |
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| 226 | case 'b': /* abbreviated month name */ |
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| 227 | if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) |
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| 228 | strcpy(tbuf, "?"); |
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| 229 | else |
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| 230 | strcpy(tbuf, months_a[timeptr->tm_mon]); |
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| 231 | break; |
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| 232 | |
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| 233 | case 'B': /* full month name */ |
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| 234 | if (timeptr->tm_mon < 0 || timeptr->tm_mon > 11) |
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| 235 | strcpy(tbuf, "?"); |
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| 236 | else |
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| 237 | strcpy(tbuf, months_l[timeptr->tm_mon]); |
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| 238 | break; |
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| 239 | |
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| 240 | case 'c': /* appropriate date and time representation */ |
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| 241 | sprintf(tbuf, "%s %s %2d %02d:%02d:%02d %d", |
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| 242 | days_a[range(0, timeptr->tm_wday, 6)], |
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| 243 | months_a[range(0, timeptr->tm_mon, 11)], |
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| 244 | range(1, timeptr->tm_mday, 31), |
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| 245 | range(0, timeptr->tm_hour, 23), |
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| 246 | range(0, timeptr->tm_min, 59), |
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| 247 | range(0, timeptr->tm_sec, 61), |
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| 248 | timeptr->tm_year + 1900); |
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| 249 | break; |
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| 250 | |
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| 251 | case 'd': /* day of the month, 01 - 31 */ |
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| 252 | i = range(1, timeptr->tm_mday, 31); |
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| 253 | sprintf(tbuf, "%02d", i); |
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| 254 | break; |
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| 255 | |
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| 256 | case 'H': /* hour, 24-hour clock, 00 - 23 */ |
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| 257 | i = range(0, timeptr->tm_hour, 23); |
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| 258 | sprintf(tbuf, "%02d", i); |
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| 259 | break; |
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| 260 | |
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| 261 | case 'I': /* hour, 12-hour clock, 01 - 12 */ |
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| 262 | i = range(0, timeptr->tm_hour, 23); |
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| 263 | if (i == 0) |
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| 264 | i = 12; |
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| 265 | else if (i > 12) |
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| 266 | i -= 12; |
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| 267 | sprintf(tbuf, "%02d", i); |
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| 268 | break; |
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| 269 | |
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| 270 | case 'j': /* day of the year, 001 - 366 */ |
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| 271 | sprintf(tbuf, "%03d", timeptr->tm_yday + 1); |
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| 272 | break; |
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| 273 | |
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| 274 | case 'm': /* month, 01 - 12 */ |
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| 275 | i = range(0, timeptr->tm_mon, 11); |
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| 276 | sprintf(tbuf, "%02d", i + 1); |
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| 277 | break; |
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| 278 | |
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| 279 | case 'M': /* minute, 00 - 59 */ |
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| 280 | i = range(0, timeptr->tm_min, 59); |
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| 281 | sprintf(tbuf, "%02d", i); |
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| 282 | break; |
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| 283 | |
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| 284 | case 'p': /* am or pm based on 12-hour clock */ |
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| 285 | i = range(0, timeptr->tm_hour, 23); |
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| 286 | if (i < 12) |
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| 287 | strcpy(tbuf, ampm[0]); |
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| 288 | else |
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| 289 | strcpy(tbuf, ampm[1]); |
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| 290 | break; |
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| 291 | |
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| 292 | case 'S': /* second, 00 - 61 */ |
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| 293 | i = range(0, timeptr->tm_sec, 61); |
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| 294 | sprintf(tbuf, "%02d", i); |
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| 295 | break; |
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| 296 | |
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| 297 | case 'U': /* week of year, Sunday is first day of week */ |
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| 298 | sprintf(tbuf, "%d", weeknumber(timeptr, 0)); |
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| 299 | break; |
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| 300 | |
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| 301 | case 'w': /* weekday, Sunday == 0, 0 - 6 */ |
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| 302 | i = range(0, timeptr->tm_wday, 6); |
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| 303 | sprintf(tbuf, "%d", i); |
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| 304 | break; |
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| 305 | |
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| 306 | case 'W': /* week of year, Monday is first day of week */ |
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| 307 | sprintf(tbuf, "%d", weeknumber(timeptr, 1)); |
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| 308 | break; |
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| 309 | |
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| 310 | case 'x': /* appropriate date representation */ |
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| 311 | sprintf(tbuf, "%s %s %2d %d", |
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| 312 | days_a[range(0, timeptr->tm_wday, 6)], |
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| 313 | months_a[range(0, timeptr->tm_mon, 11)], |
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| 314 | range(1, timeptr->tm_mday, 31), |
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| 315 | timeptr->tm_year + 1900); |
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| 316 | break; |
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| 317 | |
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| 318 | case 'X': /* appropriate time representation */ |
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| 319 | sprintf(tbuf, "%02d:%02d:%02d", |
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| 320 | range(0, timeptr->tm_hour, 23), |
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| 321 | range(0, timeptr->tm_min, 59), |
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| 322 | range(0, timeptr->tm_sec, 61)); |
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| 323 | break; |
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| 324 | |
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| 325 | case 'y': /* year without a century, 00 - 99 */ |
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| 326 | i = timeptr->tm_year % 100; |
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| 327 | sprintf(tbuf, "%d", i); |
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| 328 | break; |
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| 329 | |
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| 330 | case 'Y': /* year with century */ |
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| 331 | sprintf(tbuf, "%d", 1900 + timeptr->tm_year); |
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| 332 | break; |
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| 333 | |
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| 334 | case 'Z': /* time zone name or abbrevation */ |
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| 335 | i = 0; |
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| 336 | if (daylight && timeptr->tm_isdst) |
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| 337 | i = 1; |
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| 338 | strcpy(tbuf, tzname[i]); |
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| 339 | break; |
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| 340 | |
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| 341 | #ifdef SYSV_EXT |
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| 342 | case 'n': /* same as \n */ |
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| 343 | tbuf[0] = '\n'; |
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| 344 | tbuf[1] = '\0'; |
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| 345 | break; |
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| 346 | |
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| 347 | case 't': /* same as \t */ |
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| 348 | tbuf[0] = '\t'; |
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| 349 | tbuf[1] = '\0'; |
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| 350 | break; |
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| 351 | |
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| 352 | case 'D': /* date as %m/%d/%y */ |
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| 353 | strftime(tbuf, sizeof tbuf, "%m/%d/%y", timeptr); |
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| 354 | break; |
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| 355 | |
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| 356 | case 'e': /* day of month, blank padded */ |
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| 357 | sprintf(tbuf, "%2d", range(1, timeptr->tm_mday, 31)); |
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| 358 | break; |
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| 359 | |
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| 360 | case 'r': /* time as %I:%M:%S %p */ |
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| 361 | strftime(tbuf, sizeof tbuf, "%I:%M:%S %p", timeptr); |
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| 362 | break; |
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| 363 | |
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| 364 | case 'R': /* time as %H:%M */ |
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| 365 | strftime(tbuf, sizeof tbuf, "%H:%M", timeptr); |
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| 366 | break; |
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| 367 | |
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| 368 | case 'T': /* time as %H:%M:%S */ |
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| 369 | strftime(tbuf, sizeof tbuf, "%H:%M:%S", timeptr); |
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| 370 | break; |
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| 371 | #endif |
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| 372 | |
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| 373 | |
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| 374 | #ifdef VMS_EXT |
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| 375 | case 'V': /* date as dd-bbb-YYYY */ |
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| 376 | sprintf(tbuf, "%2d-%3.3s-%4d", |
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| 377 | range(1, timeptr->tm_mday, 31), |
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| 378 | months_a[range(0, timeptr->tm_mon, 11)], |
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| 379 | timeptr->tm_year + 1900); |
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| 380 | for (i = 3; i < 6; i++) |
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| 381 | if (islower(tbuf[i])) |
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| 382 | tbuf[i] = toupper(tbuf[i]); |
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| 383 | break; |
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| 384 | #endif |
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| 385 | |
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| 386 | |
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| 387 | #ifdef POSIX2_DATE |
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| 388 | case 'C': |
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| 389 | sprintf(tbuf, "%02d", (timeptr->tm_year + 1900) / 100); |
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| 390 | break; |
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| 391 | |
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| 392 | |
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| 393 | case 'E': |
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| 394 | case 'O': |
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| 395 | /* POSIX locale extensions, ignored for now */ |
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| 396 | goto again; |
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| 397 | #endif |
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| 398 | default: |
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| 399 | tbuf[0] = '%'; |
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| 400 | tbuf[1] = *format; |
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| 401 | tbuf[2] = '\0'; |
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| 402 | break; |
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| 403 | } |
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| 404 | i = strlen(tbuf); |
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[3d658d0] | 405 | if (i) { |
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[f017df0] | 406 | if (s + i < endp - 1) { |
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| 407 | strcpy(s, tbuf); |
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| 408 | s += i; |
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| 409 | } else |
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| 410 | return 0; |
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[3d658d0] | 411 | } |
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[f017df0] | 412 | } |
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| 413 | out: |
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| 414 | if (s < endp && *format == '\0') { |
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| 415 | *s = '\0'; |
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| 416 | return (s - start); |
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| 417 | } else |
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| 418 | return 0; |
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| 419 | } |
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| 420 | |
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| 421 | /* weeknumber --- figure how many weeks into the year */ |
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| 422 | |
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| 423 | /* With thanks and tip of the hatlo to ado@elsie.nci.nih.gov */ |
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| 424 | /* Modified byMichal Jaegermann <audfax!emory!vm.ucs.UAlberta.CA!NTOMCZAK> */ |
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| 425 | |
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| 426 | #ifndef __STDC__ |
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| 427 | static int |
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| 428 | weeknumber(timeptr, firstweekday) |
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| 429 | const struct tm *timeptr; |
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| 430 | int firstweekday; |
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| 431 | #else |
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| 432 | static int |
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| 433 | weeknumber(const struct tm *timeptr, int firstweekday) |
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| 434 | #endif |
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| 435 | /* |
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| 436 | * firstweekday is 0 if starting in Sunday, non-zero if in Monday |
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| 437 | */ |
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| 438 | { |
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| 439 | return (timeptr->tm_yday - timeptr->tm_wday + |
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| 440 | (firstweekday ? (timeptr->tm_wday ? 8 : 1) : 7)) / 7; |
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| 441 | } |
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