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1.1 ! nbrk 1: /*
! 2: * Copyright (c) 1989, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the University nor the names of its contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <sys/types.h>
! 31: #include <sys/time.h>
! 32: #include <tzfile.h>
! 33: #include <string.h>
! 34:
! 35: static const char *afmt[] = {
! 36: "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
! 37: };
! 38: static const char *Afmt[] = {
! 39: "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday",
! 40: "Saturday",
! 41: };
! 42: static const char *bfmt[] = {
! 43: "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
! 44: "Oct", "Nov", "Dec",
! 45: };
! 46: static const char *Bfmt[] = {
! 47: "January", "February", "March", "April", "May", "June", "July",
! 48: "August", "September", "October", "November", "December",
! 49: };
! 50:
! 51: static size_t gsize;
! 52: static char *pt;
! 53: static int _add(const char *);
! 54: static int _conv(int, int, int);
! 55: static int _secs(const struct tm *);
! 56: static size_t _fmt(const char *, const struct tm *);
! 57:
! 58: size_t
! 59: strftime(s, maxsize, format, t)
! 60: char *s;
! 61: size_t maxsize;
! 62: const char *format;
! 63: const struct tm *t;
! 64: {
! 65:
! 66: pt = s;
! 67: if ((gsize = maxsize) < 1)
! 68: return(0);
! 69: if (_fmt(format, t)) {
! 70: *pt = '\0';
! 71: return(maxsize - gsize);
! 72: }
! 73: return(0);
! 74: }
! 75:
! 76: static size_t
! 77: _fmt(format, t)
! 78: const char *format;
! 79: const struct tm *t;
! 80: {
! 81: for (; *format; ++format) {
! 82: if (*format == '%')
! 83: switch(*++format) {
! 84: case '\0':
! 85: --format;
! 86: break;
! 87: case 'A':
! 88: if (t->tm_wday < 0 || t->tm_wday > 6)
! 89: return(0);
! 90: if (!_add(Afmt[t->tm_wday]))
! 91: return(0);
! 92: continue;
! 93: case 'a':
! 94: if (t->tm_wday < 0 || t->tm_wday > 6)
! 95: return(0);
! 96: if (!_add(afmt[t->tm_wday]))
! 97: return(0);
! 98: continue;
! 99: case 'B':
! 100: if (t->tm_mon < 0 || t->tm_mon > 11)
! 101: return(0);
! 102: if (!_add(Bfmt[t->tm_mon]))
! 103: return(0);
! 104: continue;
! 105: case 'b':
! 106: case 'h':
! 107: if (t->tm_mon < 0 || t->tm_mon > 11)
! 108: return(0);
! 109: if (!_add(bfmt[t->tm_mon]))
! 110: return(0);
! 111: continue;
! 112: case 'C':
! 113: if (!_fmt("%a %b %e %H:%M:%S %Y", t))
! 114: return(0);
! 115: continue;
! 116: case 'c':
! 117: if (!_fmt("%m/%d/%y %H:%M:%S", t))
! 118: return(0);
! 119: continue;
! 120: case 'D':
! 121: if (!_fmt("%m/%d/%y", t))
! 122: return(0);
! 123: continue;
! 124: case 'd':
! 125: if (!_conv(t->tm_mday, 2, '0'))
! 126: return(0);
! 127: continue;
! 128: case 'e':
! 129: if (!_conv(t->tm_mday, 2, ' '))
! 130: return(0);
! 131: continue;
! 132: case 'H':
! 133: if (!_conv(t->tm_hour, 2, '0'))
! 134: return(0);
! 135: continue;
! 136: case 'I':
! 137: if (!_conv(t->tm_hour % 12 ?
! 138: t->tm_hour % 12 : 12, 2, '0'))
! 139: return(0);
! 140: continue;
! 141: case 'j':
! 142: if (!_conv(t->tm_yday + 1, 3, '0'))
! 143: return(0);
! 144: continue;
! 145: case 'k':
! 146: if (!_conv(t->tm_hour, 2, ' '))
! 147: return(0);
! 148: continue;
! 149: case 'l':
! 150: if (!_conv(t->tm_hour % 12 ?
! 151: t->tm_hour % 12 : 12, 2, ' '))
! 152: return(0);
! 153: continue;
! 154: case 'M':
! 155: if (!_conv(t->tm_min, 2, '0'))
! 156: return(0);
! 157: continue;
! 158: case 'm':
! 159: if (!_conv(t->tm_mon + 1, 2, '0'))
! 160: return(0);
! 161: continue;
! 162: case 'n':
! 163: if (!_add("\n"))
! 164: return(0);
! 165: continue;
! 166: case 'p':
! 167: if (!_add(t->tm_hour >= 12 ? "PM" : "AM"))
! 168: return(0);
! 169: continue;
! 170: case 'R':
! 171: if (!_fmt("%H:%M", t))
! 172: return(0);
! 173: continue;
! 174: case 'r':
! 175: if (!_fmt("%I:%M:%S %p", t))
! 176: return(0);
! 177: continue;
! 178: case 'S':
! 179: if (!_conv(t->tm_sec, 2, '0'))
! 180: return(0);
! 181: continue;
! 182: case 's':
! 183: if (!_secs(t))
! 184: return(0);
! 185: continue;
! 186: case 'T':
! 187: case 'X':
! 188: if (!_fmt("%H:%M:%S", t))
! 189: return(0);
! 190: continue;
! 191: case 't':
! 192: if (!_add("\t"))
! 193: return(0);
! 194: continue;
! 195: case 'U':
! 196: if (!_conv((t->tm_yday + 7 - t->tm_wday) / 7,
! 197: 2, '0'))
! 198: return(0);
! 199: continue;
! 200: case 'W':
! 201: if (!_conv((t->tm_yday + 7 -
! 202: (t->tm_wday ? (t->tm_wday - 1) : 6))
! 203: / 7, 2, '0'))
! 204: return(0);
! 205: continue;
! 206: case 'w':
! 207: if (!_conv(t->tm_wday, 1, '0'))
! 208: return(0);
! 209: continue;
! 210: case 'x':
! 211: if (!_fmt("%m/%d/%y", t))
! 212: return(0);
! 213: continue;
! 214: case 'y':
! 215: if (!_conv((t->tm_year + TM_YEAR_BASE)
! 216: % 100, 2, '0'))
! 217: return(0);
! 218: continue;
! 219: case 'Y':
! 220: if (!_conv(t->tm_year + TM_YEAR_BASE, 4, '0'))
! 221: return(0);
! 222: continue;
! 223: /*
! 224: case 'Z':
! 225: if (!t->tm_zone || !_add(t->tm_zone))
! 226: return(0);
! 227: continue;
! 228: */
! 229: case '%':
! 230: /*
! 231: * X311J/88-090 (4.12.3.5): if conversion char is
! 232: * undefined, behavior is undefined. Print out the
! 233: * character itself as printf(3) does.
! 234: */
! 235: default:
! 236: break;
! 237: }
! 238: if (!gsize--)
! 239: return(0);
! 240: *pt++ = *format;
! 241: }
! 242: return(gsize);
! 243: }
! 244:
! 245: static int
! 246: _secs(t)
! 247: const struct tm *t;
! 248: {
! 249: static char buf[15];
! 250: time_t s;
! 251: char *p;
! 252: struct tm tmp;
! 253:
! 254: /* Make a copy, mktime(3) modifies the tm struct. */
! 255: tmp = *t;
! 256: s = mktime(&tmp);
! 257: for (p = buf + sizeof(buf) - 2; s > 0 && p > buf; s /= 10)
! 258: *p-- = s % 10 + '0';
! 259: return(_add(++p));
! 260: }
! 261:
! 262: static int
! 263: _conv(n, digits, pad)
! 264: int n, digits, pad;
! 265: {
! 266: static char buf[10];
! 267: char *p;
! 268:
! 269: for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits)
! 270: *p-- = n % 10 + '0';
! 271: while (p > buf && digits-- > 0)
! 272: *p-- = pad;
! 273: return(_add(++p));
! 274: }
! 275:
! 276: static int
! 277: _add(str)
! 278: const char *str;
! 279: {
! 280: for (;; ++pt, --gsize) {
! 281: if (!gsize)
! 282: return(0);
! 283: if (!(*pt = *str++))
! 284: return(1);
! 285: }
! 286: }