Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | #include |
||
| 3 | #include |
||
| 4 | |||
| 5 | #define TM_YEAR_BASE 1900 |
||
| 6 | |||
| 7 | static const char *afmt[] = { |
||
| 8 | "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", |
||
| 9 | }; |
||
| 10 | static const char *Afmt[] = { |
||
| 11 | "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", |
||
| 12 | "Saturday", |
||
| 13 | }; |
||
| 14 | static const char *bfmt[] = { |
||
| 15 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", |
||
| 16 | "Oct", "Nov", "Dec", |
||
| 17 | }; |
||
| 18 | static const char *Bfmt[] = { |
||
| 19 | "January", "February", "March", "April", "May", "June", "July", |
||
| 20 | "August", "September", "October", "November", "December", |
||
| 21 | }; |
||
| 22 | |||
| 23 | static size_t gsize; |
||
| 24 | static char *pt; |
||
| 25 | |||
| 26 | static int |
||
| 27 | _add(const char *str) |
||
| 28 | { |
||
| 29 | for (;; ++pt, --gsize) |
||
| 30 | { |
||
| 31 | if (!gsize) |
||
| 32 | return 0; |
||
| 33 | if (!(*pt = *str++)) |
||
| 34 | return 1; |
||
| 35 | } |
||
| 36 | } |
||
| 37 | |||
| 38 | static int |
||
| 39 | _conv(int n, int digits, char pad) |
||
| 40 | { |
||
| 41 | static char buf[10]; |
||
| 42 | char *p; |
||
| 43 | |||
| 44 | for (p = buf + sizeof(buf) - 2; n > 0 && p > buf; n /= 10, --digits) |
||
| 45 | *p-- = n % 10 + '0'; |
||
| 46 | while (p > buf && digits-- > 0) |
||
| 47 | *p-- = pad; |
||
| 48 | return _add(++p); |
||
| 49 | } |
||
| 50 | |||
| 51 | static size_t |
||
| 52 | _fmt(const char *format, const struct tm *t) |
||
| 53 | { |
||
| 54 | for (; *format; ++format) |
||
| 55 | { |
||
| 56 | if (*format == '%') |
||
| 57 | switch(*++format) |
||
| 58 | { |
||
| 59 | case '\0': |
||
| 60 | --format; |
||
| 61 | break; |
||
| 62 | case 'A': |
||
| 63 | if (t->tm_wday < 0 || t->tm_wday > 6) |
||
| 64 | return 0; |
||
| 65 | if (!_add(Afmt[t->tm_wday])) |
||
| 66 | return 0; |
||
| 67 | continue; |
||
| 68 | case 'a': |
||
| 69 | if (t->tm_wday < 0 || t->tm_wday > 6) |
||
| 70 | return 0; |
||
| 71 | if (!_add(afmt[t->tm_wday])) |
||
| 72 | return 0; |
||
| 73 | continue; |
||
| 74 | case 'B': |
||
| 75 | if (t->tm_mon < 0 || t->tm_mon > 11) |
||
| 76 | return 0; |
||
| 77 | if (!_add(Bfmt[t->tm_mon])) |
||
| 78 | return 0; |
||
| 79 | continue; |
||
| 80 | case 'b': |
||
| 81 | case 'h': |
||
| 82 | if (t->tm_mon < 0 || t->tm_mon > 11) |
||
| 83 | return 0; |
||
| 84 | if (!_add(bfmt[t->tm_mon])) |
||
| 85 | return 0; |
||
| 86 | continue; |
||
| 87 | case 'C': |
||
| 88 | if (!_fmt("%a %b %e %H:%M:%S %Y", t)) |
||
| 89 | return 0; |
||
| 90 | continue; |
||
| 91 | case 'c': |
||
| 92 | if (!_fmt("%m/%d/%y %H:%M:%S", t)) |
||
| 93 | return 0; |
||
| 94 | continue; |
||
| 95 | case 'e': |
||
| 96 | if (!_conv(t->tm_mday, 2, ' ')) |
||
| 97 | return 0; |
||
| 98 | continue; |
||
| 99 | case 'D': |
||
| 100 | if (!_fmt("%m/%d/%y", t)) |
||
| 101 | return 0; |
||
| 102 | continue; |
||
| 103 | case 'd': |
||
| 104 | if (!_conv(t->tm_mday, 2, '0')) |
||
| 105 | return 0; |
||
| 106 | continue; |
||
| 107 | case 'H': |
||
| 108 | if (!_conv(t->tm_hour, 2, '0')) |
||
| 109 | return 0; |
||
| 110 | continue; |
||
| 111 | case 'I': |
||
| 112 | if (!_conv(t->tm_hour % 12 ? |
||
| 113 | t->tm_hour % 12 : 12, 2, '0')) |
||
| 114 | return 0; |
||
| 115 | continue; |
||
| 116 | case 'j': |
||
| 117 | if (!_conv(t->tm_yday + 1, 3, '0')) |
||
| 118 | return 0; |
||
| 119 | continue; |
||
| 120 | case 'k': |
||
| 121 | if (!_conv(t->tm_hour, 2, ' ')) |
||
| 122 | return 0; |
||
| 123 | continue; |
||
| 124 | case 'l': |
||
| 125 | if (!_conv(t->tm_hour % 12 ? |
||
| 126 | t->tm_hour % 12 : 12, 2, ' ')) |
||
| 127 | return 0; |
||
| 128 | continue; |
||
| 129 | case 'M': |
||
| 130 | if (!_conv(t->tm_min, 2, '0')) |
||
| 131 | return 0; |
||
| 132 | continue; |
||
| 133 | case 'm': |
||
| 134 | if (!_conv(t->tm_mon + 1, 2, '0')) |
||
| 135 | return 0; |
||
| 136 | continue; |
||
| 137 | case 'n': |
||
| 138 | if (!_add("\n")) |
||
| 139 | return 0; |
||
| 140 | continue; |
||
| 141 | case 'p': |
||
| 142 | if (!_add(t->tm_hour >= 12 ? "PM" : "AM")) |
||
| 143 | return 0; |
||
| 144 | continue; |
||
| 145 | case 'R': |
||
| 146 | if (!_fmt("%H:%M", t)) |
||
| 147 | return 0; |
||
| 148 | continue; |
||
| 149 | case 'r': |
||
| 150 | if (!_fmt("%I:%M:%S %p", t)) |
||
| 151 | return 0; |
||
| 152 | continue; |
||
| 153 | case 'S': |
||
| 154 | if (!_conv(t->tm_sec, 2, '0')) |
||
| 155 | return 0; |
||
| 156 | continue; |
||
| 157 | case 'T': |
||
| 158 | case 'X': |
||
| 159 | if (!_fmt("%H:%M:%S", t)) |
||
| 160 | return 0; |
||
| 161 | continue; |
||
| 162 | case 't': |
||
| 163 | if (!_add("\t")) |
||
| 164 | return 0; |
||
| 165 | continue; |
||
| 166 | case 'U': |
||
| 167 | if (!_conv((t->tm_yday + 7 - t->tm_wday) / 7, |
||
| 168 | 2, '0')) |
||
| 169 | return 0; |
||
| 170 | continue; |
||
| 171 | case 'W': |
||
| 172 | if (!_conv((t->tm_yday + 7 - |
||
| 173 | (t->tm_wday ? (t->tm_wday - 1) : 6)) |
||
| 174 | / 7, 2, '0')) |
||
| 175 | return 0; |
||
| 176 | continue; |
||
| 177 | case 'w': |
||
| 178 | if (!_conv(t->tm_wday, 1, '0')) |
||
| 179 | return 0; |
||
| 180 | continue; |
||
| 181 | case 'x': |
||
| 182 | if (!_fmt("%m/%d/%y", t)) |
||
| 183 | return 0; |
||
| 184 | continue; |
||
| 185 | case 'y': |
||
| 186 | if (!_conv((t->tm_year + TM_YEAR_BASE) |
||
| 187 | % 100, 2, '0')) |
||
| 188 | return 0; |
||
| 189 | continue; |
||
| 190 | case 'Y': |
||
| 191 | if (!_conv(t->tm_year + TM_YEAR_BASE, 4, '0')) |
||
| 192 | return 0; |
||
| 193 | continue; |
||
| 194 | case 'Z': |
||
| 195 | if (!t->tm_zone || !_add(t->tm_zone)) |
||
| 196 | return 0; |
||
| 197 | continue; |
||
| 198 | case '%': |
||
| 199 | /* |
||
| 200 | * X311J/88-090 (4.12.3.5): if conversion char is |
||
| 201 | * undefined, behavior is undefined. Print out the |
||
| 202 | * character itself as printf(3) does. |
||
| 203 | */ |
||
| 204 | default: |
||
| 205 | break; |
||
| 206 | } |
||
| 207 | if (!gsize--) |
||
| 208 | return 0; |
||
| 209 | *pt++ = *format; |
||
| 210 | } |
||
| 211 | return gsize; |
||
| 212 | } |
||
| 213 | |||
| 214 | size_t |
||
| 215 | strftime(char *s, size_t maxsize, const char *format, const struct tm *t) |
||
| 216 | { |
||
| 217 | pt = s; |
||
| 218 | if ((gsize = maxsize) < 1) |
||
| 219 | return 0; |
||
| 220 | if (_fmt(format, t)) |
||
| 221 | { |
||
| 222 | *pt = '\0'; |
||
| 223 | return maxsize - gsize; |
||
| 224 | } |
||
| 225 | return 0; |
||
| 226 | } |