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