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amxmodx/amxmodx/strptime.cpp
Felix Geyer 9e999a0ba6 Initial revision
2004-01-31 20:56:22 +00:00

399 lines
13 KiB
C++
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/** strptime.c **********************************************************
Locales' support for DOS / Win31 / Win32.
Copyright (c) 1995-1997 by Timofei Bondarenko <tim@ipi.ac.ru>
Localized strptime().
*-----------------------------------------------------------------------*/
//#include "config.h"
#include <time.h>
#include <ctype.h>
#include <string.h>
#ifdef __linux__
#define strnicmp strncasecmp
#endif
const char *_lc_Wday_ [2][ 7],
*_lc_Month_[2][12],
*_lc_AmPm_ [2][ 2];
const char *_lc_fmt_c_[2],
*_lc_fmt_xD[2],
*_lc_fmt_XT[2];
int _lc_Txt_, /* 0="C", 1="Local Win"/"Rus DOS" Wday, Months, AmPm */
_lc_Fmt_; /* 0="C", 1="Local", for formats %c %x %X */
//#include "_locale.h"
struct tm_int
{
int qS, /* Seconds (0...61) */
qM, /* Minutes (0...59) */
qH, /* Hour (0...23) */
qI, /* Hour (1...12) */
qp, /* 0 = AM, 1 = PM */
qd, /* Day of month (1...31)=>[0...30] */
qm, /* Month (1...12)=>[0...11] */
qY, /* Year (0...9999) */
qy, /* year (0...99) */
qC, /* Century (0...99) */
qw, /* Weekday (0...6; Sunday = 0) */
qj, /* Day of year (1..366)=>[0...365] */
qZ, /* 0 = STD, 1 = DST */
qU, /* week in year (0...53) */
qV; /* week in year mode: 'U', 'W', 'V' */
};
/* skips spaces in `strp`. Returns 0 if no spaces skipped */
static void skip_sp(const unsigned char **strp)
{
while(isspace(**strp)) (*strp)++;
}
/* scans no more decimal digits than contained in `max` as an integer,
sign isn't allowed. Returns -1 if 0 digits scanned or
if the scanned number is greater than `max`. */
static int scan_int(const unsigned char **strp, int max)
{
int cc, val, pos;
skip_sp(strp);
for(val = pos = 0; pos < max && isdigit(cc = **strp); (*strp)++)
{
pos = pos * 10 + 9;
if ((val = val * 10 + (cc - '0')) > max) return -1;
/*val = val * 10 + (cc - '0');*/
}
return pos? val: -1;
}
static int scan_int2(const unsigned char **strp)
{
int cc, val, pos;
skip_sp(strp);
for(val = pos = 0; isdigit(cc = **strp); (*strp)++)
{
pos = pos * 10 + 9;
val = val * 10 + (cc - '0');
}
return pos? val: -1;
}
/* scans one word which is equivalence (case insensitive) to a
word from list `n_full` or from list `n_short` or when
n_short is NULL to first 3 characters from a word from `n_full`.
`max` is number of words in each list `n_full` or `n_short`.
Returns the index in a list >= 0 and < `max`, or -1 if no word found. */
static int scan_word_(const unsigned char **strp,
int max, const char *const *n_full
#if USE_ABBR_NAMES
, const char *const *n_short
#endif
)
{
int ix, l_max = 100;
int found, found_len;
const char *const *word_list;
found = found_len = -1;
skip_sp(strp); /* Required? Or Not? */
Scan0:
word_list = n_full;
/*Scan1:*/
for(ix = 0; ix < max; word_list++, ix++)
{
int len;
const char *word = *word_list;
skip_sp((const unsigned char**)&word);
if (l_max < (len = strlen(word))) len = l_max;
if (found_len < len && /* search for maximal lenth */
(!len || /* at least "" always founded */
!strnicmp((const char*)*strp, word, len))) /* found */
found_len = len, found = ix;
}
if (l_max >= 100) /* first pass: full names */
{ /* go to second pass: short names */
#if USE_ABBR_NAMES
if (n_short)
{
l_max--; word_list = n_short; goto Scan1;
}
#endif
l_max = 3; goto Scan0;
}
if (found_len > 0) (*strp) += found_len;
return found; /* -1 or index or first "" */
}
#if USE_ABBR_NAMES
#define scan_word scan_word_ /* pass all arguments as is */
#else
#define scan_word(str,max,n_full,n_short) scan_word_(str,max,n_full)
#endif
static int time_int(struct tm_int *ti,
const unsigned char **buf, const char *fmt, short addthem)
{
int ii;
for(; (ii = (unsigned char)*fmt); fmt++)
if (ii != '%')
{
Other:
if (isspace(ii))
{
/*SkipSp:*/ fmt++; skip_sp((const unsigned char **)&fmt);
fmt--; skip_sp(buf);
} /* toupper(ii) != toupper(**buf) */
/*else if (_lc_igncase[ii] != _lc_igncase[**buf]) return -1;*/
else (*buf)++;
}
else
{
const char *fs;
/*Fmt:*/ switch(ii = (unsigned char)*++fmt)
{
case 0 : goto FmtEnd;
case 'a':
case 'A':
ti->qw = ii = scan_word(buf, 7,
_lc_Wday_[_lc_Txt_],
_lc_Txt_? _lc_WdayS: NULL); break;
case 'h': /* STRFTIME_EXT */
case 'b':
case 'B':
ti->qm = ii = scan_word(buf, 12,
_lc_Month_[_lc_Txt_],
_lc_Txt_? _lc_MonthS: NULL); break;
case 'c':
fs = _lc_fmt_c_[_lc_Fmt_];
strpt: ii = time_int(ti, buf, fs, addthem); break;
#if STRFTIME_EXT
case 'C': /* STRFTIME_EXT */
ti->qC = ii = addthem ? scan_int2(buf) : scan_int(buf,99);
if (ti->qy >= 0) goto SetYear;
else if (ti->qY >= 0)
{
ti->qY = ti->qY % 100 + ii * 100;
goto CleanCy;
}
break;
case 'e': /* STRFTIME_EXT */
#endif
case 'd':
ti->qd = ii = (addthem ? scan_int2(buf) : scan_int(buf, 31)) - 1; break;
#if STRFTIME_EXT
case 'D': /* STRFTIME_EXT */
fs = _lc_fmt_xD[0]; goto strpt;
/* case 'E': STRFTIME_EXT "Era specefic" see %'O' */
/* case 'h': STRFTIME_EXT see %'b' */
#endif
case 'H':
ti->qH = ii = addthem ? scan_int2(buf) : scan_int(buf, 23);
CleanIp: ti->qI = ti->qp = -1; break;
case 'I':
ti->qI =
ti->qH = ii = addthem ? scan_int2(buf) : scan_int(buf, 23);
if (ii == 0 || ii > 12) goto CleanIp;
else ti->qH = -1;
break;
case 'j':
ti->qj = ii = (addthem ? scan_int2(buf) : scan_int(buf, 366)) - 1;
ti->qU = -1; break;
case 'm':
ti->qm = ii = (addthem ? scan_int2(buf) : scan_int(buf, 12)) - 1; break;
case 'M':
ti->qM = ii = addthem ? scan_int2(buf) : scan_int(buf, 59); break;
#if STRFTIME_EXT
case 'n': /* STRFTIME_EXT */
case 't': /* STRFTIME_EXT */ goto SkipSp;
case 'N': /* STRFTIME_EXT */
fs = _lc_fmt_N_; goto strpt;
case 'E': /* STRFTIME_EXT "Era specefic" */
#endif
#if STRFTIME_EXT | STRFTIME_WIN
case 'O': /* STRFTIME_EXT "Alternate digits" */
goto Fmt;
#endif
case 'p':
ti->qp = /*ii =*/ scan_word(buf, 2, _lc_AmPm_[_lc_Txt_], NULL);
break;
#if STRFTIME_EXT
case 'r': /* STRFTIME_EXT */
fs = _lc_fmt_rI; goto strpt;
case 'R': /* STRFTIME_EXT */
fs = _lc_fmt_RH; goto strpt;
#endif
case 'S':
ti->qS = ii = addthem ? scan_int2(buf) : scan_int(buf, 61); break;
#if STRFTIME_EXT
case 'T': /* STRFTIME_EXT */
fs = _lc_fmt_XT[0]; goto strpt;
case 'u': /* STRFTIME_EXT */
ti->qw = ii = addthem ? scan_int2(buf) : scan_int(buf, 7);
if (ii == 7) ti->qw = 0;
else if (!ii) ii--;
break;
#endif
#if STRFTIME_EXT && 0
case 'V': /* STRFTIME_EXT 0 = Wednesday ?(Thursday) */
#endif
case 'U':
case 'W':
ti->qV = ii;
ti->qU = ii = addthem ? scan_int2(buf) : scan_int(buf, 53); break;
case 'w':
ti->qw = ii = addthem ? scan_int2(buf) : scan_int(buf, 6); break;
case 'x':
fs = _lc_fmt_xD[_lc_Fmt_]; goto strpt;
case 'X':
fs = _lc_fmt_XT[_lc_Fmt_]; goto strpt;
case 'y':
ti->qy = ii = addthem ? scan_int2(buf) : scan_int(buf, 99);
#if STRFTIME_EXT
if (ti->qC >= 0)
{
SetYear: ti->qY = ti->qC * 100 + ti->qy;
goto CleanCy;
}
#endif
if (ti->qY >= 0)
{
ti->qY = ti->qY - ti->qY % 100 + ii;
goto CleanCy;
}
break;
case 'Y':
ti->qY = ii = addthem ? scan_int2(buf) : scan_int(buf, 9999);
CleanCy: ti->qC = ti->qy = -1; break;
#if STRFTIME_EXT
case 'Z': /* STRFTIME_EXT */
ti->qZ = ii = scan_word(buf, /*!daylight? 1:*/ 2, tzname, NULL) +1;
if (!ii)
while((ii = **buf) && !isspace(ii)
/*&& !isdigit(ii) && !strchr("+-,", ii)*/
) (*buf)++;
break;
#endif
/* case '%': */
default: /**************************/ goto Other;
} /* end of switch() */
if (ii < 0) return -1;
} /* end of else, for() */
FmtEnd:
return 0;
}
typedef void (*specoper)(int* one, int two);
void justreplace(int* one, int two){
*one = two;
}
void justadd(int* one, int two){
*one += two;
}
char *strptime(const char *buf, const char *fmt, struct tm *tm, short addthem)
{
specoper defoper = addthem ? justadd : justreplace;
struct tm_int ti;
ti.qS = /* Seconds (0...61) */
ti.qM = /* Minutes (0...59) */
ti.qH = /* Hour (0...23) */
ti.qI = /* Hour (1...12) */
ti.qp = /* 0 = AM, 1 = PM */
ti.qd = /* Day of month (1...31)=>[0...30] */
ti.qm = /* Month (1...12)=>[0...11] */
ti.qY = /* Year (0...9999) */
ti.qy = /* year (0...99) */
ti.qC = /* Century (0...99) */
ti.qw = /* Weekday (0...6; Sunday = 0) */
ti.qj = /* Day of year (1..366)=>[0...365] */
ti.qZ = /* 0 = STD, 1 = DST */
ti.qU = /* week in year (0...53) */
ti.qV = -1; /* week in year mode: 0=U, 1=W, 2=V */
if (0 > time_int(&ti, (const unsigned char **)&buf, fmt, addthem)) buf = NULL;
if (0 <= ti.qS) (*defoper) ( &tm->tm_sec , ti.qS );
if (0 <= ti.qM) (*defoper) ( &tm->tm_min , ti.qM ); //tm->tm_min = ti.qM;
if (0 <= ti.qI)
if (0 <= ti.qp) ti.qH = ti.qI % 12 + ti.qp * 12;
else (*defoper) ( &tm->tm_hour , ti.qI ); //tm->tm_hour = ti.qI;
if (0 <= ti.qH) (*defoper) ( &tm->tm_hour , ti.qH ); //tm->tm_hour = ti.qH;
if (0 <= ti.qZ) (*defoper) ( &tm->tm_isdst , ti.qZ - 1 ); //tm->tm_isdst = ti.qZ - 1;
if (0 <= ti.qy) ti.qY = ti.qy;
if (0 <= ti.qY) (*defoper) ( &tm->tm_year ,
ti.qY +=
(ti.qY > 99? -1900:
(ti.qY < 70? 100: 0)) );
/*tm->tm_year = ti.qY +=
(ti.qY > 99? -1900:
(ti.qY < 70? 100: 0));*/
/* ti.qC = %C = Century without an Year - ignored */
if (70 <= ti.qY && ti.qY < 200) /* a representable year */
{
/* 01-01-70 was Thursday, 1968 was leap */
int day = (((ti.qY - 69) >> 2) + ti.qY - 70 + 4) % 7;
/* 2100 wrongly assumed as leap!
if (ti.qY > 200 && --day < 0) day = 6; */
if (0 <= ti.qU && 0 <= ti.qw && 0 > ti.qj)
{
ti.qj = ti.qU * 7;
switch(ti.qV)
{
case 'U': /* %U Sun first */
ti.qj += ti.qw - (day == 0 ? 7: day);
break;
case 'W': /* %W Mon first */
ti.qj += (ti.qw + 6) % 7
- (day == 1 ? 7: (day + 6) % 7);
break;
#if STRFTIME_EXT && 0
case 'V': /* %V >= 4 day */
if (ti.qU == 53) ti.qj = 0;
/* Sun first: */
ti.qj += ti.qw - (day < 4 ? 7: 0) - day;
/* Mon first:
ti.qj += (ti.qw + 6) % 7
- ((day + 6) % 7 < 5 ? 7: 0)
- (day + 6) % 7; */
break;
#endif
default: break;
}
}
#if 0 /* Advanced validating for yday<>m/d/y */
if (0 <= ti.qj)
{
static int m_days[12] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
int mon = (ti.qj + day) % 7;
if (0 > ti.qw) ti.qw = mon;
else if (ti.qw != mon) return NULL;
for(mon = 11; 0 > (day = /* not for 2100: && ti.qY != 200 */
ti.qj - (m_days[mon] + (mon > 1 && !(ti.qY & 3))))
; mon--);
if (0 > ti.qd) ti.qd = day;
else if (ti.qd != day) return NULL;
if (0 > ti.qm) ti.qm = mon;
else if (ti.qm != mon) return NULL;
}
#endif
}
if (0 <= ti.qd) (*defoper) ( &tm->tm_mday , ti.qd + 1 ); //tm->tm_mday = ti.qd + 1;
if (0 <= ti.qm) (*defoper) ( &tm->tm_mon , ti.qm ); //tm->tm_mon = ti.qm;
if (0 <= ti.qw) (*defoper) ( &tm->tm_wday , ti.qw ); //tm->tm_wday = ti.qw;
if (0 <= ti.qj) (*defoper) ( &tm->tm_yday , ti.qj ); //tm->tm_yday = ti.qj;
return (char*)buf;
}
/* end of strftime.c */
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