forked from enlightenment/efl
589 lines
16 KiB
C
589 lines
16 KiB
C
#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif /* HAVE_CONFIG_H */
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#include <strings.h>
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#include <inttypes.h>
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#include <ctype.h>
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#include <time.h>
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#include "evil_private.h"
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/*
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* strptime
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* based on http://cvsweb.netbsd.org/bsdweb.cgi/src/lib/libc/time/strptime.c?rev=HEAD
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* BSD licence
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*/
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#define TM_YEAR_BASE 1900
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/*
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* We do not implement alternate representations. However, we always
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* check whether a given modifier is allowed for a certain conversion.
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*/
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#define ALT_E 0x01
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#define ALT_O 0x02
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#define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; }
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static const char *day[7] =
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{
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"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
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};
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static const char *abday[7] =
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{
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"Sun","Mon","Tue","Wed","Thu","Fri","Sat"
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};
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static const char *mon[12] =
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{
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"January", "February", "March", "April", "May", "June", "July",
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"August", "September", "October", "November", "December"
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};
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static const char *abmon[12] =
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{
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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};
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static const char *am_pm[2] =
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{
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"AM", "PM"
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};
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static char gmt[] = { "GMT" };
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#ifdef TM_ZONE
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static char utc[] = { "UTC" };
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#endif
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/* RFC-822/RFC-2822 */
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static const char * const nast[5] = {
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"EST", "CST", "MST", "PST", "\0\0\0"
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};
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static const char * const nadt[5] = {
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"EDT", "CDT", "MDT", "PDT", "\0\0\0"
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};
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static const unsigned char *
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find_string(const unsigned char *bp, int *tgt,
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const char *const *n1, const char *const *n2,
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int c)
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{
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size_t len;
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int i;
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/* check full name - then abbreviated ones */
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for (; n1 != NULL; n1 = n2, n2 = NULL)
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{
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for (i = 0; i < c; i++, n1++)
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{
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len = strlen(*n1);
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if (strncasecmp(*n1, (const char *)bp, len) == 0)
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{
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*tgt = i;
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return bp + len;
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}
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}
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}
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/* Nothing matched */
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return NULL;
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}
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static const unsigned char *
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conv_num(const unsigned char *buf, int *dest, unsigned int llim, unsigned int ulim)
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{
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unsigned int result = 0;
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unsigned char ch;
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/* The limit also determines the number of valid digits. */
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unsigned int rulim = ulim;
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ch = *buf;
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if (ch < '0' || ch > '9')
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return NULL;
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do {
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result *= 10;
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result += ch - '0';
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rulim /= 10;
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ch = *++buf;
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} while ((result * 10 <= ulim) && rulim && (ch >= '0') && (ch <= '9'));
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if ((result < llim) || (result > ulim))
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return NULL;
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*dest = result;
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return buf;
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}
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char *
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strptime(const char *buf, const char *fmt, struct tm *tm)
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{
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unsigned char c;
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const unsigned char *bp, *ep;
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int alt_format, i, split_year = 0, neg = 0, offs;
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const char *new_fmt;
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bp = (const unsigned char *)buf;
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while (bp != NULL && (c = *fmt++) != '\0')
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{
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/* Clear `alternate' modifier prior to new conversion. */
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alt_format = 0;
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i = 0;
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/* Eat up white-space. */
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if (isspace(c))
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{
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while (isspace(*bp))
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bp++;
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continue;
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}
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if (c != '%')
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goto literal;
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again:
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switch (c = *fmt++)
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{
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case '%': /* "%%" is converted to "%". */
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literal:
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if (c != *bp++)
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return NULL;
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LEGAL_ALT(0);
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continue;
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/*
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* "Alternative" modifiers. Just set the appropriate flag
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* and start over again.
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*/
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case 'E': /* "%E?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_E;
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goto again;
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case 'O': /* "%O?" alternative conversion modifier. */
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LEGAL_ALT(0);
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alt_format |= ALT_O;
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goto again;
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/*
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* "Complex" conversion rules, implemented through recursion.
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*/
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/* case 'c': /\* Date and time, using the locale's format. *\/ */
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/* new_fmt = _TIME_LOCALE(loc)->d_t_fmt; */
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/* goto recurse; */
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case 'D': /* The date as "%m/%d/%y". */
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new_fmt = "%m/%d/%y";
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LEGAL_ALT(0);
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goto recurse;
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case 'F': /* The date as "%Y-%m-%d". */
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new_fmt = "%Y-%m-%d";
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LEGAL_ALT(0);
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goto recurse;
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case 'R': /* The time as "%H:%M". */
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new_fmt = "%H:%M";
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LEGAL_ALT(0);
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goto recurse;
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/* case 'r': /\* The time in 12-hour clock representation. *\/ */
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/* new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm; */
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/* LEGAL_ALT(0); */
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/* goto recurse; */
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case 'T': /* The time as "%H:%M:%S". */
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new_fmt = "%H:%M:%S";
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LEGAL_ALT(0);
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goto recurse;
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/* case 'X': /\* The time, using the locale's format. *\/ */
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/* new_fmt = _TIME_LOCALE(loc)->t_fmt; */
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/* goto recurse; */
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/* case 'x': /\* The date, using the locale's format. *\/ */
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/* new_fmt = _TIME_LOCALE(loc)->d_fmt; */
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recurse:
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bp = (const unsigned char *)strptime((const char *)bp,
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new_fmt, tm);
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LEGAL_ALT(ALT_E);
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continue;
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/*
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* "Elementary" conversion rules.
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*/
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case 'A': /* The day of week, using the locale's form. */
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case 'a':
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bp = find_string(bp, &tm->tm_wday, day, abday, 7);
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LEGAL_ALT(0);
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continue;
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case 'B': /* The month, using the locale's form. */
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case 'b':
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case 'h':
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bp = find_string(bp, &tm->tm_mon, mon, abmon, 12);
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LEGAL_ALT(0);
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continue;
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case 'C': /* The century number. */
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i = 20;
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bp = conv_num(bp, &i, 0, 99);
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i = i * 100 - TM_YEAR_BASE;
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if (split_year)
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i += tm->tm_year % 100;
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split_year = 1;
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tm->tm_year = i;
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LEGAL_ALT(ALT_E);
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continue;
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case 'd': /* The day of month. */
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case 'e':
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bp = conv_num(bp, &tm->tm_mday, 1, 31);
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LEGAL_ALT(ALT_O);
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continue;
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case 'k': /* The hour (24-hour clock representation). */
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LEGAL_ALT(0);
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/* FALLTHROUGH */
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case 'H':
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bp = conv_num(bp, &tm->tm_hour, 0, 23);
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LEGAL_ALT(ALT_O);
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continue;
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case 'l': /* The hour (12-hour clock representation). */
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LEGAL_ALT(0);
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/* FALLTHROUGH */
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case 'I':
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bp = conv_num(bp, &tm->tm_hour, 1, 12);
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if (tm->tm_hour == 12)
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tm->tm_hour = 0;
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LEGAL_ALT(ALT_O);
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continue;
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case 'j': /* The day of year. */
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i = 1;
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bp = conv_num(bp, &i, 1, 366);
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tm->tm_yday = i - 1;
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LEGAL_ALT(0);
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continue;
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case 'M': /* The minute. */
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bp = conv_num(bp, &tm->tm_min, 0, 59);
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LEGAL_ALT(ALT_O);
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continue;
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case 'm': /* The month. */
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i = 1;
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bp = conv_num(bp, &i, 1, 12);
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tm->tm_mon = i - 1;
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LEGAL_ALT(ALT_O);
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continue;
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case 'p': /* The locale's equivalent of AM/PM. */
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bp = find_string(bp, &i, am_pm, NULL, 2);
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if (tm->tm_hour > 11)
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return NULL;
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tm->tm_hour += i * 12;
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LEGAL_ALT(0);
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continue;
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case 'S': /* The seconds. */
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bp = conv_num(bp, &tm->tm_sec, 0, 61);
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LEGAL_ALT(ALT_O);
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continue;
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#ifndef TIME_MAX
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# ifdef _WIN64
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# define TIME_MAX INT64_MAX
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# else
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# define TIME_MAX INT32_MAX
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# endif
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#endif
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case 's': /* seconds since the epoch */
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{
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time_t sse = 0;
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__int64 rulim = TIME_MAX;
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if (*bp < '0' || *bp > '9')
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{
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bp = NULL;
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continue;
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}
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do
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{
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sse *= 10;
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sse += *bp++ - '0';
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rulim /= 10;
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} while ((sse * 10 <= TIME_MAX) &&
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rulim && *bp >= '0' && *bp <= '9');
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if (sse < 0 || sse > TIME_MAX)
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{
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bp = NULL;
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continue;
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}
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if (localtime_r(&sse, tm) == NULL)
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bp = NULL;
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}
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continue;
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case 'U': /* The week of year, beginning on sunday. */
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case 'W': /* The week of year, beginning on monday. */
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/*
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* XXX This is bogus, as we can not assume any valid
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* information present in the tm structure at this
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* point to calculate a real value, so just check the
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* range for now.
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*/
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bp = conv_num(bp, &i, 0, 53);
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LEGAL_ALT(ALT_O);
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continue;
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case 'w': /* The day of week, beginning on sunday. */
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bp = conv_num(bp, &tm->tm_wday, 0, 6);
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LEGAL_ALT(ALT_O);
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continue;
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case 'u': /* The day of week, monday = 1. */
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bp = conv_num(bp, &i, 1, 7);
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tm->tm_wday = i % 7;
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LEGAL_ALT(ALT_O);
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continue;
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case 'g': /* The year corresponding to the ISO week
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* number but without the century.
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*/
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bp = conv_num(bp, &i, 0, 99);
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continue;
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case 'G': /* The year corresponding to the ISO week
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* number with century.
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*/
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do
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bp++;
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while (isdigit(*bp));
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continue;
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case 'V': /* The ISO 8601:1988 week number as decimal */
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bp = conv_num(bp, &i, 0, 53);
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continue;
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case 'Y': /* The year. */
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i = TM_YEAR_BASE; /* just for data sanity... */
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bp = conv_num(bp, &i, 0, 9999);
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tm->tm_year = i - TM_YEAR_BASE;
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LEGAL_ALT(ALT_E);
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continue;
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case 'y': /* The year within 100 years of the epoch. */
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/* LEGAL_ALT(ALT_E | ALT_O); */
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bp = conv_num(bp, &i, 0, 99);
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if (split_year)
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/* preserve century */
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i += (tm->tm_year / 100) * 100;
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else {
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split_year = 1;
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if (i <= 68)
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i = i + 2000 - TM_YEAR_BASE;
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else
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i = i + 1900 - TM_YEAR_BASE;
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}
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tm->tm_year = i;
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continue;
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case 'Z':
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tzset();
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if (strncmp((const char *)bp, gmt, 3) == 0) {
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tm->tm_isdst = 0;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = 0;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = gmt;
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#endif
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bp += 3;
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}
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else
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{
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ep = find_string(bp, &i,
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(const char * const *)tzname,
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NULL, 2);
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if (ep != NULL)
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{
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tm->tm_isdst = i;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = -(timezone);
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = tzname[i];
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#endif
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}
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bp = ep;
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}
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continue;
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case 'z':
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/*
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* We recognize all ISO 8601 formats:
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* Z = Zulu time/UTC
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* [+-]hhmm
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* [+-]hh:mm
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* [+-]hh
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* We recognize all RFC-822/RFC-2822 formats:
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* UT|GMT
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* North American : UTC offsets
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* E[DS]T = Eastern : -4 | -5
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* C[DS]T = Central : -5 | -6
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* M[DS]T = Mountain: -6 | -7
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* P[DS]T = Pacific : -7 | -8
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* Military
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* [A-IL-M] = -1 ... -9 (J not used)
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* [N-Y] = +1 ... +12
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*/
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while (isspace(*bp))
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bp++;
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switch (*bp++)
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{
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case 'G':
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if (*bp++ != 'M')
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return NULL;
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/*FALLTHROUGH*/
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case 'U':
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if (*bp++ != 'T')
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return NULL;
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/*FALLTHROUGH*/
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case 'Z':
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tm->tm_isdst = 0;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = 0;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = utc;
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#endif
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continue;
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case '+':
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neg = 0;
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break;
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case '-':
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neg = 1;
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break;
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default:
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--bp;
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ep = find_string(bp, &i, nast, NULL, 4);
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if (ep != NULL) {
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = -5 - i;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = __UNCONST(nast[i]);
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#endif
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bp = ep;
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continue;
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}
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ep = find_string(bp, &i, nadt, NULL, 4);
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if (ep != NULL)
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{
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tm->tm_isdst = 1;
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = -4 - i;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = __UNCONST(nadt[i]);
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#endif
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bp = ep;
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continue;
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}
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if ((*bp >= 'A' && *bp <= 'I') ||
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(*bp >= 'L' && *bp <= 'Y'))
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{
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#ifdef TM_GMTOFF
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/* Argh! No 'J'! */
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if (*bp >= 'A' && *bp <= 'I')
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tm->TM_GMTOFF =
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('A' - 1) - (int)*bp;
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else if (*bp >= 'L' && *bp <= 'M')
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tm->TM_GMTOFF = 'A' - (int)*bp;
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else if (*bp >= 'N' && *bp <= 'Y')
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tm->TM_GMTOFF = (int)*bp - 'M';
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = NULL; /* XXX */
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#endif
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bp++;
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continue;
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}
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return NULL;
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}
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offs = 0;
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for (i = 0; i < 4; )
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{
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if (isdigit(*bp))
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{
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offs = offs * 10 + (*bp++ - '0');
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i++;
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continue;
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}
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if (i == 2 && *bp == ':')
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{
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bp++;
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continue;
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}
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break;
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}
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switch (i)
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{
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case 2:
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offs *= 100;
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break;
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case 4:
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i = offs % 100;
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if (i >= 60)
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return NULL;
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/* Convert minutes into decimal */
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offs = (offs / 100) * 100 + (i * 50) / 30;
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break;
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default:
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return NULL;
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}
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if (neg)
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offs = -offs;
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tm->tm_isdst = 0; /* XXX */
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#ifdef TM_GMTOFF
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tm->TM_GMTOFF = offs;
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#endif
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#ifdef TM_ZONE
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tm->TM_ZONE = NULL; /* XXX */
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#endif
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continue;
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/*
|
|
* Miscellaneous conversions.
|
|
*/
|
|
case 'n': /* Any kind of white-space. */
|
|
case 't':
|
|
while (isspace(*bp))
|
|
bp++;
|
|
LEGAL_ALT(0);
|
|
continue;
|
|
|
|
default: /* Unknown/unsupported conversion. */
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return (char *)bp;
|
|
}
|