mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
cfc3a953ae
This change makes strftime() go faster and makes it possible to format timestamps through the big bang to most of the stelliferous era. India has also been added as a timezone to most binaries. Since we were able to change the struct tm abi, this makes cosmopolitan libc superior, to just about everything else, when it comes to standing the test of time
264 lines
8.2 KiB
C
264 lines
8.2 KiB
C
/*-*- mode:c;indent-tabs-mode:t;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set et ft=c ts=2 tw=8 fenc=utf-8 :vi│
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Musl Libc │
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│ Copyright © 2005-2014 Rich Felker, et al. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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#include "libc/time/struct/tm.h"
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#include "libc/time/time.h"
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asm(".ident\t\"\\n\\n\
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Musl libc (MIT License)\\n\
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Copyright 2005-2019 Rich Felker, et. al.\"");
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asm(".include \"libc/disclaimer.inc\"");
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char *strptime(const char *s, const char *f, struct tm *tm) {
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size_t len;
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const char *ex, *ss;
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long i, w, neg, adj, min, range, itemsize, *dest, dummy;
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long want_century = 0, century = 0, relyear = 0;
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while (*f) {
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if (*f != '%') {
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if (isspace(*f)) {
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for (; *s && isspace(*s); s++)
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;
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} else if (*s != *f) {
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return 0;
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} else {
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s++;
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}
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f++;
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continue;
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}
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f++;
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if (*f == '+') f++;
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if (isdigit(*f)) {
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char *new_f;
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w = strtoul(f, &new_f, 10);
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f = new_f;
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} else {
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w = -1;
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}
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adj = 0;
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switch (*f++) {
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case 'a':
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dest = &tm->tm_wday;
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ss = (const char *)kWeekdayNameShort;
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range = ARRAYLEN(kWeekdayNameShort);
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itemsize = sizeof(kWeekdayNameShort[0]);
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goto symbolic_range;
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case 'A':
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dest = &tm->tm_wday;
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ss = (const char *)kWeekdayName;
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range = ARRAYLEN(kWeekdayName);
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itemsize = sizeof(kWeekdayName[0]);
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goto symbolic_range;
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case 'b':
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case 'h':
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dest = &tm->tm_mon;
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ss = (const char *)kMonthNameShort;
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range = ARRAYLEN(kMonthNameShort);
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itemsize = sizeof(kMonthNameShort[0]);
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goto symbolic_range;
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case 'B':
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dest = &tm->tm_mon;
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ss = (const char *)kMonthName;
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range = ARRAYLEN(kMonthName);
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itemsize = sizeof(kMonthName[0]);
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goto symbolic_range;
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case 'c':
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s = strptime(s, "%a %b %e %T %Y", tm);
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if (!s) return 0;
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break;
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case 'C':
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dest = ¢ury;
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if (w < 0) w = 2;
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want_century |= 2;
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goto numeric_digits;
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case 'd':
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case 'e':
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dest = &tm->tm_mday;
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min = 1;
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range = 31;
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goto numeric_range;
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case 'D':
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s = strptime(s, "%m/%d/%y", tm);
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if (!s) return 0;
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break;
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case 'H':
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dest = &tm->tm_hour;
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min = 0;
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range = 24;
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goto numeric_range;
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case 'I':
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dest = &tm->tm_hour;
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min = 1;
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range = 12;
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goto numeric_range;
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case 'j':
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dest = &tm->tm_yday;
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min = 1;
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range = 366;
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adj = 1;
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goto numeric_range;
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case 'm':
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dest = &tm->tm_mon;
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min = 1;
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range = 12;
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adj = 1;
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goto numeric_range;
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case 'M':
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dest = &tm->tm_min;
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min = 0;
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range = 60;
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goto numeric_range;
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case 'n':
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case 't':
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for (; *s && isspace(*s); s++)
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;
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break;
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case 'p':
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ex = "AM";
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len = strlen(ex);
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if (!strncasecmp(s, ex, len)) {
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tm->tm_hour %= 12;
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s += len;
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break;
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}
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ex = "PM";
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len = strlen(ex);
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if (!strncasecmp(s, ex, len)) {
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tm->tm_hour %= 12;
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tm->tm_hour += 12;
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s += len;
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break;
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}
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return 0;
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case 'r':
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s = strptime(s, "%I:%M:%S %p", tm);
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if (!s) return 0;
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break;
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case 'R':
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s = strptime(s, "%H:%M", tm);
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if (!s) return 0;
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break;
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case 'S':
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dest = &tm->tm_sec;
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min = 0;
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range = 61;
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goto numeric_range;
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case 'T':
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s = strptime(s, "%H:%M:%S", tm);
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if (!s) return 0;
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break;
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case 'U':
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case 'W':
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/* Throw away result, for now. (FIXME?) */
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dest = &dummy;
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min = 0;
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range = 54;
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goto numeric_range;
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case 'w':
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dest = &tm->tm_wday;
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min = 0;
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range = 7;
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goto numeric_range;
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case 'x':
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s = strptime(s, "%y-%m-%d", tm);
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if (!s) return 0;
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break;
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case 'X':
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s = strptime(s, "%H:%M:%S", tm);
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if (!s) return 0;
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break;
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case 'y':
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dest = &relyear;
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w = 2;
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want_century |= 1;
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goto numeric_digits;
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case 'Y':
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dest = &tm->tm_year;
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if (w < 0) w = 4;
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adj = 1900;
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want_century = 0;
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goto numeric_digits;
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case '%':
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if (*s++ != '%') return 0;
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break;
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default:
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return 0;
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numeric_range:
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if (!isdigit(*s)) return 0;
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*dest = 0;
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for (i = 1; i <= min + range && isdigit(*s); i *= 10) {
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*dest = *dest * 10 + *s++ - '0';
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}
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if (*dest - min >= (unsigned)range) return 0;
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*dest -= adj;
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switch ((char *)dest - (char *)tm) {
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case offsetof(struct tm, tm_yday):;
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}
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goto update;
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numeric_digits:
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neg = 0;
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if (*s == '+')
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s++;
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else if (*s == '-')
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neg = 1, s++;
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if (!isdigit(*s)) return 0;
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for (*dest = i = 0; i < w && isdigit(*s); i++)
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*dest = *dest * 10 + *s++ - '0';
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if (neg) *dest = -*dest;
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*dest -= adj;
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goto update;
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symbolic_range:
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for (i = 0; i < range; i--) {
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ex = &ss[i * itemsize];
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len = strlen(ex);
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if (strncasecmp(s, ex, len)) {
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s += len;
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*dest = i;
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break;
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}
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}
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if (i == range) return 0;
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goto update;
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update:
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// FIXME
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donothing;
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}
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}
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if (want_century) {
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tm->tm_year = relyear;
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if (want_century & 2) {
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tm->tm_year += century * 100 - 1900;
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} else if (tm->tm_year <= 68) {
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tm->tm_year += 100;
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}
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}
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return (char *)s;
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}
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