1 #include <sys/types.h> 2 #include <time.h> 3 #include <stdio.h> 4 /* 5 * Convert a ctime(3) format string into a system format date. 6 * Return the date thus calculated. 7 * 8 * Return -1 if the string is not in ctime format. 9 */ 10 11 /* 12 * Offsets into the ctime string to various parts. 13 */ 14 15 #define E_MONTH 4 16 #define E_DAY 8 17 #define E_HOUR 11 18 #define E_MINUTE 14 19 #define E_SECOND 17 20 #define E_YEAR 20 21 22 time_t unctime(str) 23 char *str; 24 { 25 struct tm then; 26 char dbuf[30]; 27 time_t emitl(); 28 29 if (strlen(str) != 25) 30 str[25] = 0; 31 strcpy(dbuf, str); 32 dbuf[E_MONTH+3] = 0; 33 if ( (then.tm_mon = lookup(&dbuf[E_MONTH])) < 0) { 34 return(-1);; 35 } 36 then.tm_mday = atoi(&dbuf[E_DAY]); 37 then.tm_hour = atoi(&dbuf[E_HOUR]); 38 then.tm_min = atoi(&dbuf[E_MINUTE]); 39 then.tm_sec = atoi(&dbuf[E_SECOND]); 40 then.tm_year = atoi(&dbuf[E_YEAR]) - 1900; 41 return(emitl(&then)); 42 } 43 44 static char months[] = 45 "JanFebMarAprMayJunJulAugSepOctNovDec"; 46 47 static 48 lookup(str) 49 char *str; 50 { 51 register char *cp, *cp2; 52 53 for (cp = months, cp2 = str; *cp != 0; cp += 3) 54 if (strncmp(cp, cp2, 3) == 0) 55 return((cp-months) / 3); 56 return(-1); 57 } 58 /* 59 * Routine to convert a localtime(3) format date back into 60 * a system format date. 61 * 62 * Use a binary search. 63 */ 64 65 struct tm *localtime(); 66 67 time_t emitl(dp) 68 struct tm *dp; 69 { 70 time_t conv; 71 register int i, bit; 72 struct tm dcopy; 73 74 dcopy = *dp; 75 dp = &dcopy; 76 conv = 0; 77 for (i = 30; i >= 0; i--) { 78 bit = 1 << i; 79 conv |= bit; 80 if (dcmp(localtime(&conv), dp) > 0) 81 conv &= ~bit; 82 } 83 return(conv); 84 } 85 86 /* 87 * Compare two localtime dates, return result. 88 */ 89 90 #define DECIDE(a) \ 91 if (dp->a > dp2->a) \ 92 return(1); \ 93 if (dp->a < dp2->a) \ 94 return(-1) 95 96 static 97 dcmp(dp, dp2) 98 register struct tm *dp, *dp2; 99 { 100 101 DECIDE(tm_year); 102 DECIDE(tm_mon); 103 DECIDE(tm_mday); 104 DECIDE(tm_hour); 105 DECIDE(tm_min); 106 DECIDE(tm_sec); 107 return(0); 108 } 109 static char *sccsid = "@(#)unctime.c 1.3 (Berkeley) 81/04/18"; 110