projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 461723e7 KM |
1 | /*- |
| 2 | * Copyright (c) 1980 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 76797561 DF |
6 | */ |
| 7 | ||
| bbbe213d | 8 | #ifndef lint |
| 8686d964 | 9 | static char sccsid[] = "@(#)unctime.c 5.5 (Berkeley) %G%"; |
| 36783b71 | 10 | #endif /* not lint */ |
| bbbe213d | 11 | |
| 6e1fe29b | 12 | #include <sys/types.h> |
| 13298603 | 13 | #include <time.h> |
| 50953c5b | 14 | #include <stdio.h> |
| 13298603 | 15 | #ifdef __STDC__ |
| 36783b71 CT |
16 | #include <stdlib.h> |
| 17 | #include <string.h> | |
| 13298603 | 18 | #endif |
| 36783b71 | 19 | |
| 6e1fe29b BJ |
20 | /* |
| 21 | * Convert a ctime(3) format string into a system format date. | |
| 22 | * Return the date thus calculated. | |
| 23 | * | |
| 24 | * Return -1 if the string is not in ctime format. | |
| 25 | */ | |
| 26 | ||
| 27 | /* | |
| 28 | * Offsets into the ctime string to various parts. | |
| 29 | */ | |
| 30 | ||
| 31 | #define E_MONTH 4 | |
| 32 | #define E_DAY 8 | |
| 33 | #define E_HOUR 11 | |
| 34 | #define E_MINUTE 14 | |
| 35 | #define E_SECOND 17 | |
| 36 | #define E_YEAR 20 | |
| 37 | ||
| 36783b71 CT |
38 | static int lookup(); |
| 39 | ||
| 40 | time_t | |
| 41 | unctime(str) | |
| 6e1fe29b BJ |
42 | char *str; |
| 43 | { | |
| 44 | struct tm then; | |
| 45 | char dbuf[30]; | |
| 46 | time_t emitl(); | |
| 47 | ||
| 48 | if (strlen(str) != 25) | |
| 49 | str[25] = 0; | |
| 8686d964 | 50 | (void) strcpy(dbuf, str); |
| 6e1fe29b | 51 | dbuf[E_MONTH+3] = 0; |
| 36783b71 CT |
52 | if ((then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) |
| 53 | return (-1); | |
| 6e1fe29b BJ |
54 | then.tm_mday = atoi(&dbuf[E_DAY]); |
| 55 | then.tm_hour = atoi(&dbuf[E_HOUR]); | |
| 56 | then.tm_min = atoi(&dbuf[E_MINUTE]); | |
| 57 | then.tm_sec = atoi(&dbuf[E_SECOND]); | |
| 58 | then.tm_year = atoi(&dbuf[E_YEAR]) - 1900; | |
| 59 | return(emitl(&then)); | |
| 60 | } | |
| 61 | ||
| 62 | static char months[] = | |
| 63 | "JanFebMarAprMayJunJulAugSepOctNovDec"; | |
| 64 | ||
| 36783b71 | 65 | static int |
| 6e1fe29b BJ |
66 | lookup(str) |
| 67 | char *str; | |
| 68 | { | |
| 69 | register char *cp, *cp2; | |
| 70 | ||
| 71 | for (cp = months, cp2 = str; *cp != 0; cp += 3) | |
| 72 | if (strncmp(cp, cp2, 3) == 0) | |
| 73 | return((cp-months) / 3); | |
| 74 | return(-1); | |
| 75 | } | |
| 76 | /* | |
| 77 | * Routine to convert a localtime(3) format date back into | |
| 78 | * a system format date. | |
| 79 | * | |
| 80 | * Use a binary search. | |
| 81 | */ | |
| 82 | ||
| 83 | struct tm *localtime(); | |
| 36783b71 | 84 | static int dcmp(); |
| 6e1fe29b | 85 | |
| 36783b71 CT |
86 | time_t |
| 87 | emitl(dp) | |
| 6e1fe29b BJ |
88 | struct tm *dp; |
| 89 | { | |
| 90 | time_t conv; | |
| 91 | register int i, bit; | |
| 92 | struct tm dcopy; | |
| 93 | ||
| 94 | dcopy = *dp; | |
| 95 | dp = &dcopy; | |
| 96 | conv = 0; | |
| 50953c5b | 97 | for (i = 30; i >= 0; i--) { |
| 6e1fe29b BJ |
98 | bit = 1 << i; |
| 99 | conv |= bit; | |
| 100 | if (dcmp(localtime(&conv), dp) > 0) | |
| 101 | conv &= ~bit; | |
| 102 | } | |
| 103 | return(conv); | |
| 104 | } | |
| 105 | ||
| 106 | /* | |
| 107 | * Compare two localtime dates, return result. | |
| 108 | */ | |
| 109 | ||
| 110 | #define DECIDE(a) \ | |
| 111 | if (dp->a > dp2->a) \ | |
| 112 | return(1); \ | |
| 113 | if (dp->a < dp2->a) \ | |
| 114 | return(-1) | |
| 115 | ||
| 36783b71 | 116 | static int |
| 6e1fe29b BJ |
117 | dcmp(dp, dp2) |
| 118 | register struct tm *dp, *dp2; | |
| 119 | { | |
| 120 | ||
| 121 | DECIDE(tm_year); | |
| 122 | DECIDE(tm_mon); | |
| 123 | DECIDE(tm_mday); | |
| 124 | DECIDE(tm_hour); | |
| 125 | DECIDE(tm_min); | |
| 126 | DECIDE(tm_sec); | |
| 127 | return(0); | |
| 128 | } |