1 /* 2 * Copyright (c) 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #if defined(LIBC_SCCS) && !defined(lint) 9 static char sccsid[] = "@(#)strftime.c 5.8 (Berkeley) 06/01/90"; 10 #endif /* LIBC_SCCS and not lint */ 11 12 #include <sys/types.h> 13 #include <sys/time.h> 14 #include <tzfile.h> 15 #include <string.h> 16 17 static char *afmt[] = { 18 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", 19 }; 20 static char *Afmt[] = { 21 "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", 22 "Saturday", 23 }; 24 static char *bfmt[] = { 25 "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", 26 "Oct", "Nov", "Dec", 27 }; 28 static char *Bfmt[] = { 29 "January", "February", "March", "April", "May", "June", "July", 30 "August", "September", "October", "November", "December", 31 }; 32 33 static size_t gsize; 34 static char *pt; 35 36 size_t 37 strftime(s, maxsize, format, t) 38 char *s; 39 char *format; 40 size_t maxsize; 41 struct tm *t; 42 { 43 size_t _fmt(); 44 45 pt = s; 46 if ((gsize = maxsize) < 1) 47 return(0); 48 if (_fmt(format, t)) { 49 *pt = '\0'; 50 return(maxsize - gsize); 51 } 52 return(0); 53 } 54 55 static size_t 56 _fmt(format, t) 57 register char *format; 58 struct tm *t; 59 { 60 for (; *format; ++format) { 61 if (*format == '%') 62 switch(*++format) { 63 case '\0': 64 --format; 65 break; 66 case 'A': 67 if (t->tm_wday < 0 || t->tm_wday > 6) 68 return(0); 69 if (!_add(Afmt[t->tm_wday])) 70 return(0); 71 continue; 72 case 'a': 73 if (t->tm_wday < 0 || t->tm_wday > 6) 74 return(0); 75 if (!_add(afmt[t->tm_wday])) 76 return(0); 77 continue; 78 case 'B': 79 if (t->tm_mon < 0 || t->tm_mon > 11) 80 return(0); 81 if (!_add(Bfmt[t->tm_mon])) 82 return(0); 83 continue; 84 case 'b': 85 case 'h': 86 if (t->tm_mon < 0 || t->tm_mon > 11) 87 return(0); 88 if (!_add(bfmt[t->tm_mon])) 89 return(0); 90 continue; 91 case 'C': 92 if (!_fmt("%a %b %e %H:%M:%S %Y", t)) 93 return(0); 94 continue; 95 case 'c': 96 if (!_fmt("%m/%d/%y %H:%M:%S", t)) 97 return(0); 98 continue; 99 case 'e': 100 if (!_conv(t->tm_mday, 2, ' ')) 101 return(0); 102 continue; 103 case 'D': 104 if (!_fmt("%m/%d/%y", t)) 105 return(0); 106 continue; 107 case 'd': 108 if (!_conv(t->tm_mday, 2, '0')) 109 return(0); 110 continue; 111 case 'H': 112 if (!_conv(t->tm_hour, 2, '0')) 113 return(0); 114 continue; 115 case 'I': 116 if (!_conv(t->tm_hour % 12 ? 117 t->tm_hour % 12 : 12, 2, '0')) 118 return(0); 119 continue; 120 case 'j': 121 if (!_conv(t->tm_yday + 1, 3, '0')) 122 return(0); 123 continue; 124 case 'k': 125 if (!_conv(t->tm_hour, 2, ' ')) 126 return(0); 127 continue; 128 case 'l': 129 if (!_conv(t->tm_hour % 12 ? 130 t->tm_hour % 12 : 12, 2, ' ')) 131 return(0); 132 continue; 133 case 'M': 134 if (!_conv(t->tm_min, 2, '0')) 135 return(0); 136 continue; 137 case 'm': 138 if (!_conv(t->tm_mon + 1, 2, '0')) 139 return(0); 140 continue; 141 case 'n': 142 if (!_add("\n")) 143 return(0); 144 continue; 145 case 'p': 146 if (!_add(t->tm_hour >= 12 ? "PM" : "AM")) 147 return(0); 148 continue; 149 case 'R': 150 if (!_fmt("%H:%M", t)) 151 return(0); 152 continue; 153 case 'r': 154 if (!_fmt("%I:%M:%S %p", t)) 155 return(0); 156 continue; 157 case 'S': 158 if (!_conv(t->tm_sec, 2, '0')) 159 return(0); 160 continue; 161 case 'T': 162 case 'X': 163 if (!_fmt("%H:%M:%S", t)) 164 return(0); 165 continue; 166 case 't': 167 if (!_add("\t")) 168 return(0); 169 continue; 170 case 'U': 171 if (!_conv((t->tm_yday + 7 - t->tm_wday) / 7, 172 2, '0')) 173 return(0); 174 continue; 175 case 'W': 176 if (!_conv((t->tm_yday + 7 - 177 (t->tm_wday ? (t->tm_wday - 1) : 6)) 178 / 7, 2, '0')) 179 return(0); 180 continue; 181 case 'w': 182 if (!_conv(t->tm_wday, 1, '0')) 183 return(0); 184 continue; 185 case 'x': 186 if (!_fmt("%m/%d/%y", t)) 187 return(0); 188 continue; 189 case 'y': 190 if (!_conv((t->tm_year + TM_YEAR_BASE) 191 % 100, 2, '0')) 192 return(0); 193 continue; 194 case 'Y': 195 if (!_conv(t->tm_year + TM_YEAR_BASE, 4, '0')) 196 return(0); 197 continue; 198 case 'Z': 199 if (!t->tm_zone || !_add(t->tm_zone)) 200 return(0); 201 continue; 202 case '%': 203 /* 204 * X311J/88-090 (4.12.3.5): if conversion char is 205 * undefined, behavior is undefined. Print out the 206 * character itself as printf(3) does. 207 */ 208 default: 209 break; 210 } 211 if (!gsize--) 212 return(0); 213 *pt++ = *format; 214 } 215 return(gsize); 216 } 217 218 static 219 _conv(n, digits, pad) 220 int n, digits; 221 char pad; 222 { 223 static char buf[10]; 224 register char *p; 225 226 for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits) 227 *p-- = n % 10 + '0'; 228 while (p > buf && digits-- > 0) 229 *p-- = pad; 230 return(_add(++p)); 231 } 232 233 static 234 _add(str) 235 register char *str; 236 { 237 for (;; ++pt, --gsize) { 238 if (!gsize) 239 return(0); 240 if (!(*pt = *str++)) 241 return(1); 242 } 243 } 244