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#include <lib.h>
#include <time.h>
static char* ABB_WEEKDAY[7] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static char* FULL_WEEKDAY[7] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturady"
};
static char* ABB_MONTH[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static char* FULL_MONTH[12] = {
"January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
};
static char *write_num(unsigned int num, unsigned int pad, char *buf, size_t n) {
size_t digits = 1;
unsigned int x = num;
while (x /= 10, x > 0) digits++;
if (pad == 0) pad = digits;
for (size_t i = 0; i < pad; i++) {
size_t digit;
if (i >= digits) {
digit = 0;
} else {
digit = num % 10;
num /= 10;
}
if (pad - i - 1 >= n) continue;
buf[pad - i - 1] = '0' + digit;
}
if (pad > n) pad = n;
return buf + pad;
}
void timetostr(time_t *time, char *format, char *buf, size_t n) {
char *index = buf;
char c;
int space;
while (
c = *format++,
space = (buf + n) - index,
c != '\0' && space > 0
) {
if (c != '%') {
*index++ = c;
continue;
} else {
c = *format++;
}
switch (c) {
case '%':
*index++ = '%';
break;
case 'a':
index = strncpy(index, ABB_WEEKDAY[time->wday], space);
break;
case 'A':
index = strncpy(index, FULL_WEEKDAY[time->wday], space);
break;
case 'b':
case 'h':
index = strncpy(index, ABB_MONTH[time->mon], space);
break;
case 'B':
index = strncpy(index, FULL_MONTH[time->mon], space);
break;
case 'C':
index = write_num(time->cen, 0, index, space);
break;
case 'd':
index = write_num(time->mday, 2, index, space);
break;
case 'H':
index = write_num(time->hour, 2, index, space);
break;
case 'I':
index = write_num((time->hour + 12) % 12 + 1, 2, index, space);
break;
case 'j':
index = write_num(time->yday, 3, index, space);
break;
case 'm':
index = write_num(time->mon + 1, 2, index, space);
break;
case 'M':
index = write_num(time->min, 2, index, space);
break;
case 'n':
*index++ = '\n';
break;
case 'p':
index = strncpy(index, time->hour > 11 ? "PM" : "AM", space);
break;
case 'P':
index = strncpy(index, time->hour > 11 ? "pm" : "am", space);
break;
case 'q':
index = write_num((time->mon + 3) / 3, 0, index, space);
break;
case 'S':
index = write_num(time->sec, 2, index, space);
break;
case 't':
*index++ = '\t';
break;
case 'u':
index = write_num(((time->wday + 1 )% 7) + 1, 0, index, space);
break;
case 'w':
index = write_num(time->wday, 0, index, space);
break;
case 'y':
index = write_num(time->yn, 2, index, space);
break;
case 'Y':
index = write_num(time->year + 1900, 0, index, space);
break;
default: {
char b[3] = {'%', c, '\0'};
index = strncpy(index, b, space);
break;
}
}
}
if (space < 1)
buf[n - 1] = '\0';
else
*index = '\0';
}
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