279 lines
6.7 KiB
C++
279 lines
6.7 KiB
C++
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#include <bits/ensure.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <frigg/debug.hpp>
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#include <mlibc/sysdeps.hpp>
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clock_t clock(void) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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double difftime(time_t a, time_t b){
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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time_t mktime(struct tm *ptr){
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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int timespec_get(struct timespec *ptr, int base){
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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char *asctime(const struct tm *ptr){
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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char *ctime(const time_t *timer){
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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struct tm *gmtime(const time_t *timer) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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struct tm *localtime(const time_t *t) {
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static thread_local struct tm per_thread_tm;
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return localtime_r(t, &per_thread_tm);
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}
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size_t strftime(char *__restrict dest, size_t max_size,
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const char *__restrict format, const struct tm *__restrict tm) {
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auto c = format;
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auto p = dest;
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while(*c) {
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auto space = (dest + max_size) - p;
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assert(space >= 0);
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if(*c != '%') {
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if(!space)
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return 0;
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*p = *c;
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c++;
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p++;
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continue;
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}
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if(*(c + 1) == 'Y') {
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auto chunk = snprintf(p, space, "%d", 1900 + tm->tm_year);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'm') {
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auto chunk = snprintf(p, space, "%d", tm->tm_mon + 1);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'd') {
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auto chunk = snprintf(p, space, "%d", tm->tm_mday);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'Z') {
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auto chunk = snprintf(p, space, "%s", "GMT");
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'H') {
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auto chunk = snprintf(p, space, "%i", tm->tm_hour);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'M') {
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auto chunk = snprintf(p, space, "%i", tm->tm_min);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'S') {
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auto chunk = snprintf(p, space, "%d", tm->tm_sec);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'F') {
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auto chunk = snprintf(p, space, "%d/%d/%d", 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'a') {
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const char *strdays[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
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int day = tm->tm_wday;
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if(day < 0 || day > 6)
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assert(!"Day not in bounds.");
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auto chunk = snprintf(p, space, "%s", strdays[day]);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'b') {
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const char *strmons[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
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"Aug", "Sep", "Oct", "Nov", "Dec" };
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int mon = tm->tm_mon;
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if(mon < 0 || mon > 11)
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assert(!"Month not in bounds.");
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auto chunk = snprintf(p, space, "%s", strmons[mon]);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'c') {
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auto chunk = snprintf(p, space, "%d/%d/%d %d:%d:%d", 1900 + tm->tm_year,
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tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'd') {
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auto chunk = snprintf(p, space, "%d", tm->tm_mday);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'I') {
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int hour = tm->tm_hour;
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if(hour > 12)
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hour -= 12;
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auto chunk = snprintf(p, space, "%i", hour);
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if(chunk >= space)
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return 0;
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p += chunk;
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c += 2;
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}else if (*(c + 1) == 'p') {
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if(tm->tm_hour < 12) {
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char time[] = "AM";
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auto chunk = snprintf(p, space, "%s", time);
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if(chunk >= space)
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return 0;
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p += chunk;
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}else {
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char time[] = "PM";
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auto chunk = snprintf(p, space, "%s", time);
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if(chunk >= space)
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return 0;
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p += chunk;
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}
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c += 2;
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}else {
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assert(!"Unknown format type.");
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}
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}
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auto space = (dest + max_size) - p;
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if(!space)
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return 0;
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*p = '\0';
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return (p - dest) + 1;
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}
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// POSIX extensions.
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int nanosleep(const struct timespec *, struct timespec *) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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int clock_getres(clockid_t, struct timespec *) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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int clock_gettime(clockid_t clock, struct timespec *time) {
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if(mlibc::sys_clock_get(clock, &time->tv_sec, &time->tv_nsec))
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return -1;
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return 0;
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}
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int clock_nanosleep(clockid_t, int, const struct timespec *, struct timespec *) {
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__ensure(!"clock_nanosleep() not implemented");
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__builtin_unreachable();
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}
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int clock_settime(clockid_t, const struct timespec *) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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int utimes(const char *, const struct timeval[2]) {
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__ensure(!"Not implemented");
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__builtin_unreachable();
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}
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time_t time(time_t *out) {
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long nanos;
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if(mlibc::sys_clock_get(CLOCK_REALTIME, out, &nanos))
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return (time_t)-1;
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return 0;
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}
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namespace {
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void civil_from_days(time_t days_since_epoch, int *year, unsigned int *month, unsigned int *day) {
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time_t time = days_since_epoch + 719468;
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int era = (time >= 0 ? time : time - 146096) / 146097;
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unsigned int doe = static_cast<unsigned int>(time - era * 146097);
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unsigned int yoe = (doe - doe/1460 + doe/36524 - doe/146096) / 365;
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int y = static_cast<int>(yoe) + era * 400;
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unsigned int doy = doe - (365*yoe + yoe/4 - yoe/100);
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unsigned int mp = (5*doy + 2)/153;
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unsigned int d = doy - (153*mp+2)/5 + 1;
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unsigned int m = mp + (mp < 10 ? 3 : -9);
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*year = y + (m <= 2);
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*month = m;
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*day = d;
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}
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void weekday_from_days(time_t days_since_epoch, unsigned int *weekday) {
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*weekday = static_cast<unsigned int>(days_since_epoch >= -4 ?
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(days_since_epoch+4) % 7 : (days_since_epoch+5) % 7 + 6);
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}
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void yearday_from_date(unsigned int year, unsigned int month, unsigned int day, unsigned int *yday) {
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unsigned int n1 = 275 * month / 9;
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unsigned int n2 = (month + 9) / 12;
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unsigned int n3 = (1 + (year - 4 * year / 4 + 2) / 3);
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*yday = n1 - (n2 * n3) + day - 30;
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}
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} //anonymous namespace
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struct tm *localtime_r(const time_t *time, struct tm *tm) {
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int year;
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unsigned int month;
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unsigned int day;
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unsigned int weekday;
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unsigned int yday;
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int days_since_epoch = *time / (60*60*24);
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civil_from_days(days_since_epoch, &year, &month, &day);
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weekday_from_days(days_since_epoch, &weekday);
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yearday_from_date(year, month, day, &yday);
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tm->tm_sec = *time % 60;
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tm->tm_min = (*time / 60) % 60;
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tm->tm_hour = (*time / (60*60)) % 24;
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tm->tm_mday = day;
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tm->tm_mon = month - 1;
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tm->tm_year = year - 1900;
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tm->tm_wday = weekday;
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tm->tm_yday = yday - 1;
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tm->tm_isdst = -1;
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return tm;
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}
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