diff options
Diffstat (limited to '')
| -rw-r--r-- | kernel/src/print/time.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/kernel/src/print/time.c b/kernel/src/print/time.c new file mode 100644 index 0000000..7f52a98 --- /dev/null +++ b/kernel/src/print/time.c @@ -0,0 +1,146 @@ +#include <stdbool.h> +#include <string.h> +#include <time.h> +#include <stddef.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(struct Time *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'; +} |