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   1 /*
   2  * Copyright (c) 1989 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that: (1) source distributions retain this entire copyright
   7  * notice and comment, and (2) distributions including binaries display
   8  * the following acknowledgement:  ``This product includes software
   9  * developed by the University of California, Berkeley and its contributors''
  10  * in the documentation or other materials provided with the distribution
  11  * and in all advertising materials mentioning features or use of this
  12  * software. Neither the name of the University nor the names of its
  13  * contributors may be used to endorse or promote products derived
  14  * from this software without specific prior written permission.
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  */
  19
  20 #if defined(LIBC_SCCS) && !defined(lint)
  21 static char sccsid[] = "@(#)strftime.c  5.8 (Berkeley) 6/1/90";
  22 #endif /* LIBC_SCCS and not lint */
  23
  24 #include "amanda.h"
  25 #include <tzfile.h>
  26
  27 static char *afmt[] = {
  28         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
  29 };
  30 static char *Afmt[] = {
  31         "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
  32         "Saturday",
  33 };
  34 static char *bfmt[] = {
  35         "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
  36         "Oct", "Nov", "Dec",
  37 };
  38 static char *Bfmt[] = {
  39         "January", "February", "March", "April", "May", "June", "July",
  40         "August", "September", "October", "November", "December",
  41 };
  42
  43 static size_t gsize;
  44 static char *pt;
  45
  46 size_t
  47 strftime(s, maxsize, format, t)
  48         char *s;
  49         char *format;
  50         size_t maxsize;
  51         struct tm *t;
  52 {
  53         size_t _fmt();
  54
  55         pt = s;
  56         if ((gsize = maxsize) < 1)
  57                 return(0);
  58         if (_fmt(format, t)) {
  59                 *pt = '\0';
  60                 return(maxsize - gsize);
  61         }
  62         return(0);
  63 }
  64
  65 static size_t
  66 _fmt(format, t)
  67         register char *format;
  68         struct tm *t;
  69 {
  70         for (; *format; ++format) {
  71                 if (*format == '%')
  72                         switch(*++format) {
  73                         case '\0':
  74                                 --format;
  75                                 break;
  76                         case 'A':
  77                                 if (t->tm_wday < 0 || t->tm_wday > 6)
  78                                         return(0);
  79                                 if (!_add(Afmt[t->tm_wday]))
  80                                         return(0);
  81                                 continue;
  82                         case 'a':
  83                                 if (t->tm_wday < 0 || t->tm_wday > 6)
  84                                         return(0);
  85                                 if (!_add(afmt[t->tm_wday]))
  86                                         return(0);
  87                                 continue;
  88                         case 'B':
  89                                 if (t->tm_mon < 0 || t->tm_mon > 11)
  90                                         return(0);
  91                                 if (!_add(Bfmt[t->tm_mon]))
  92                                         return(0);
  93                                 continue;
  94                         case 'b':
  95                         case 'h':
  96                                 if (t->tm_mon < 0 || t->tm_mon > 11)
  97                                         return(0);
  98                                 if (!_add(bfmt[t->tm_mon]))
  99                                         return(0);
 100                                 continue;
 101                         case 'C':
 102                                 if (!_fmt("%a %b %e %H:%M:%S %Y", t))
 103                                         return(0);
 104                                 continue;
 105                         case 'c':
 106                                 if (!_fmt("%m/%d/%y %H:%M:%S", t))
 107                                         return(0);
 108                                 continue;
 109                         case 'e':
 110                                 if (!_conv(t->tm_mday, 2, ' '))
 111                                         return(0);
 112                                 continue;
 113                         case 'D':
 114                                 if (!_fmt("%m/%d/%y", t))
 115                                         return(0);
 116                                 continue;
 117                         case 'd':
 118                                 if (!_conv(t->tm_mday, 2, '0'))
 119                                         return(0);
 120                                 continue;
 121                         case 'H':
 122                                 if (!_conv(t->tm_hour, 2, '0'))
 123                                         return(0);
 124                                 continue;
 125                         case 'I':
 126                                 if (!_conv(t->tm_hour % 12 ?
 127                                     t->tm_hour % 12 : 12, 2, '0'))
 128                                         return(0);
 129                                 continue;
 130                         case 'j':
 131                                 if (!_conv(t->tm_yday + 1, 3, '0'))
 132                                         return(0);
 133                                 continue;
 134                         case 'k':
 135                                 if (!_conv(t->tm_hour, 2, ' '))
 136                                         return(0);
 137                                 continue;
 138                         case 'l':
 139                                 if (!_conv(t->tm_hour % 12 ?
 140                                     t->tm_hour % 12 : 12, 2, ' '))
 141                                         return(0);
 142                                 continue;
 143                         case 'M':
 144                                 if (!_conv(t->tm_min, 2, '0'))
 145                                         return(0);
 146                                 continue;
 147                         case 'm':
 148                                 if (!_conv(t->tm_mon + 1, 2, '0'))
 149                                         return(0);
 150                                 continue;
 151                         case 'n':
 152                                 if (!_add("\n"))
 153                                         return(0);
 154                                 continue;
 155                         case 'p':
 156                                 if (!_add(t->tm_hour >= 12 ? "PM" : "AM"))
 157                                         return(0);
 158                                 continue;
 159                         case 'R':
 160                                 if (!_fmt("%H:%M", t))
 161                                         return(0);
 162                                 continue;
 163                         case 'r':
 164                                 if (!_fmt("%I:%M:%S %p", t))
 165                                         return(0);
 166                                 continue;
 167                         case 'S':
 168                                 if (!_conv(t->tm_sec, 2, '0'))
 169                                         return(0);
 170                                 continue;
 171                         case 'T':
 172                         case 'X':
 173                                 if (!_fmt("%H:%M:%S", t))
 174                                         return(0);
 175                                 continue;
 176                         case 't':
 177                                 if (!_add("\t"))
 178                                         return(0);
 179                                 continue;
 180                         case 'U':
 181                                 if (!_conv((t->tm_yday + 7 - t->tm_wday) / 7,
 182                                     2, '0'))
 183                                         return(0);
 184                                 continue;
 185                         case 'W':
 186                                 if (!_conv((t->tm_yday + 7 -
 187                                     (t->tm_wday ? (t->tm_wday - 1) : 6))
 188                                     / 7, 2, '0'))
 189                                         return(0);
 190                                 continue;
 191                         case 'w':
 192                                 if (!_conv(t->tm_wday, 1, '0'))
 193                                         return(0);
 194                                 continue;
 195                         case 'x':
 196                                 if (!_fmt("%m/%d/%y", t))
 197                                         return(0);
 198                                 continue;
 199                         case 'y':
 200                                 if (!_conv((t->tm_year + TM_YEAR_BASE)
 201                                     % 100, 2, '0'))
 202                                         return(0);
 203                                 continue;
 204                         case 'Y':
 205                                 if (!_conv(t->tm_year + TM_YEAR_BASE, 4, '0'))
 206                                         return(0);
 207                                 continue;
 208                         case 'Z':
 209                                 if (!t->tm_zone || !_add(t->tm_zone))
 210                                         return(0);
 211                                 continue;
 212                         case '%':
 213                         /*
 214                          * X311J/88-090 (4.12.3.5): if conversion char is
 215                          * undefined, behavior is undefined.  Print out the
 216                          * character itself as printf(3) does.
 217                          */
 218                         default:
 219                                 break;
 220                 }
 221                 if (!gsize--)
 222                         return(0);
 223                 *pt++ = *format;
 224         }
 225         return(gsize);
 226 }
 227
 228 static
 229 _conv(n, digits, pad)
 230         int n, digits;
 231         char pad;
 232 {
 233         static char buf[10];
 234         register char *p;
 235
 236         for (p = buf + SIZEOF(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
 237                 *p-- = n % 10 + '0';
 238         while (p > buf && digits-- > 0)
 239                 *p-- = pad;
 240         return(_add(++p));
 241 }
 242
 243 static
 244 _add(str)
 245         register char *str;
 246 {
 247         for (;; ++pt, --gsize) {
 248                 if (!gsize)
 249                         return(0);
 250                 if (!(*pt = *str++))
 251                         return(1);
 252         }
 253 }