mirror of
https://github.com/danog/liquid.git
synced 2024-12-02 14:57:49 +01:00
69 lines
1.9 KiB
Go
69 lines
1.9 KiB
Go
// Package strftime wraps the C stdlib strftime and strptime functions.
|
|
package strftime
|
|
|
|
/*
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#include <errno.h>
|
|
int read_errno() { return errno; }
|
|
*/
|
|
import "C"
|
|
import (
|
|
"syscall"
|
|
"time"
|
|
"unsafe"
|
|
)
|
|
|
|
// Note: The use of errno below is not thread-safe.
|
|
//
|
|
// Even if we added a mutex, it would not be thread-safe
|
|
// relative to other C stdlib calls that don't use that mutex.
|
|
//
|
|
// OTOH, I can't find a format string that C strftime thinks is illegal
|
|
// to test this with, so maybe this is a non-issue
|
|
|
|
// Strftime wraps the C Strftime function
|
|
func Strftime(format string, t time.Time) (string, error) {
|
|
var (
|
|
_, offset = t.Zone()
|
|
tz = t.Location()
|
|
secs = t.Sub(time.Date(1970, 1, 1, 0, 0, 0, 0, tz)).Seconds() - float64(offset)
|
|
tt = C.time_t(secs)
|
|
tm = C.struct_tm{}
|
|
cFormat = C.CString(format)
|
|
cOut [256]C.char
|
|
)
|
|
defer C.free(unsafe.Pointer(cFormat)) // nolint: gas
|
|
C.localtime_r(&tt, &tm)
|
|
size := C.strftime(&cOut[0], C.size_t(len(cOut)), cFormat, &tm)
|
|
if size == 0 {
|
|
// If size == 0 there *might* be an error.
|
|
if errno := C.read_errno(); errno != 0 {
|
|
return "", syscall.Errno(errno)
|
|
}
|
|
}
|
|
return C.GoString(&cOut[0]), nil
|
|
}
|
|
|
|
// Strptime wraps the C strptime function
|
|
// func Strptime(format, s string) (time.Time, error) {
|
|
// var (
|
|
// tm = C.struct_tm{}
|
|
// cFormat = C.CString(format)
|
|
// cin = C.CString(s)
|
|
// )
|
|
// defer C.free(unsafe.Pointer(cin)) // nolint: gas
|
|
// defer C.free(unsafe.Pointer(cFormat)) // nolint: gas
|
|
// ptr := C.strptime(cin, cFormat, &tm)
|
|
// if ptr == nil {
|
|
// var zero time.Time
|
|
// return zero, &time.ParseError{
|
|
// Layout: format,
|
|
// Value: s,
|
|
// LayoutElem: format,
|
|
// ValueElem: s,
|
|
// }
|
|
// }
|
|
// return time.Date(int(tm.tm_year)+1900, time.Month(tm.tm_mon+1), int(tm.tm_mday), int(tm.tm_hour), int(tm.tm_min), int(tm.tm_sec), 0, time.UTC), nil
|
|
// }
|