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#include <sys/types.h>
#include <time.h>
#include "dietfeatures.h"
static const char sweekdays [7] [4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static const char weekdays [7] [10] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
static const char smonths [12] [4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const char* months [12] = {
"January", "February", "March", "April", smonths[5-1], "June",
"July", "August", "September", "October", "November", "December"
};
static const char ampm [4] [3] = {
"am", "pm",
"AM", "PM"
};
static int i2a ( char* dest,unsigned int x )
{
int div = 10;
*dest++ = x/div + '0';
*dest++ = x%div + '0';
*dest++ = '\0';
return 2;
}
size_t strftime ( char* dst, size_t max, const char* format, const struct tm* tm )
{
char* p = dst;
const char* src;
unsigned int no;
char buf [5];
for ( ; *format != '\0'; format++ ) {
if (*format == '%') {
if (*++format == '%') {
*p++ = '%';
}
else
again:
switch (*format) {
// case '%': *p++ = '%'; break; // reduce size of jump table
case 'n': *p++ = '\n'; break;
case 't': *p++ = '\t'; break;
case 'O': case 'E': ++format; goto again;
case 'c': src = "%b %a %d %k:%M:%S %Z %Y"; goto _strf;
case 'r': src = "%I:%M:%S %p"; goto _strf;
case 'R': src = "%H:%M"; goto _strf;
case 'x': src = "%b %a %d"; goto _strf;
case 'X': src = "%k:%M:%S"; goto _strf;
case 'D': src = "%m/%d/%y"; goto _strf;
case 'T': src = "%H:%M:%S";
_strf: p += strftime (p, (size_t)(dst+max-p), src, tm); break;
case 'a': src = sweekdays [tm->tm_wday]; goto _str;
case 'A': src = weekdays [tm->tm_wday]; goto _str;
case 'h':
case 'b': src = smonths [tm->tm_mon]; goto _str;
case 'B': src = months [tm->tm_mon]; goto _str;
case 'p': src = ampm [tm->tm_hour > 12 ? 3 : 2]; goto _str;
case 'P': src = ampm [tm->tm_hour > 12 ? 1 : 0]; goto _str;
case 'C': no = tm->tm_year/100 + 19; goto _no;
case 'd': no = tm->tm_mday; goto _no;
case 'e': no = tm->tm_mday; goto _nos;
case 'H': no = tm->tm_hour; goto _no;
case 'I': no = tm->tm_hour % 12; goto _no;
case 'j': no = tm->tm_yday; goto _no;
case 'k': no = tm->tm_hour; goto _nos;
case 'l': no = tm->tm_hour % 12; goto _nos;
case 'm': no = tm->tm_mon + 1; goto _no;
case 'M': no = tm->tm_min; goto _no;
case 'S': no = tm->tm_sec; goto _no;
case 'u': no = tm->tm_wday ? tm->tm_wday : 7; goto _no;
case 'w': no = tm->tm_wday; goto _no;
case 'U': no = (tm->tm_yday - tm->tm_wday + 7) / 7; goto _no;
case 'W': no = (tm->tm_yday - (tm->tm_wday - 1 + 7) % 7 + 7) / 7; goto _no;
case 'Z':
#ifdef WANT_TZFILE_PARSER
tzset(); src = tzname[0];
#else
src = "[unknown timezone]";
#endif
goto _str;
case 'Y': i2a ( buf+0, (unsigned int)(tm->tm_year / 100 + 19) );
i2a ( buf+2, (unsigned int)(tm->tm_year % 100) );
src = buf;
goto _str;
case 'y': no = tm->tm_year % 100; goto _no;
_no: i2a ( buf, no ); /* append number 'no' */
src = buf;
goto _str;
_nos: i2a ( buf, no ); /* the same, but '0'->' ' */
if (buf[0] == '0')
buf[0] = ' ';
src = buf;
_str: while (*src && p < dst+max) /* append string */
*p++ = *src++;
break;
};
} else {
*p++ = *format;
}
if (p >= dst+max)
break;
}
*p = '\0';
return p - dst;
}
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