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view uptools/libcoding/decode_helpers.c @ 407:19e5a3e2f9c0

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fcup-settime: moved time() retrieval a little closer to the output A fundamental problem with all simple time transfer tools is that there is always some delay between the time retrieval on the source system and that transmitted time being set on the destination, and the resulting time on the destination system is off by that delay amount. This delay cannot be fully eliminated when working in a simple environment like ours, but we should make our best effort to minimize it. In the present case, moving the atinterf_init() call before the time() retrieval should make a teensy-tiny improvement.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Aug 2018 21:52:17 +0000
parents 978571e23318
children 1c599681fd60
line wrap: on
line source

/*
 * This library module implements the is_decoded_char_ok() and emit_utf8_char()
 * functions used by gsm7_to_ascii_or_ext() and ucs2_to_ascii_or_ext().
 */

#include <sys/types.h>

is_decoded_char_ok(uni, ascii_ext)
	unsigned uni;
{
	unsigned upper_limit;

	/* weed out control chars first */
	if (uni < 0x20)
		return(0);
	if (uni >= 0x7F && uni <= 0x9F)
		return(0);
	/* see what range our output encoding allows */
	switch (ascii_ext) {
	case 0:
		upper_limit = 0x7F;
		break;
	case 1:
		upper_limit = 0xFF;
		break;
	case 2:
		upper_limit = 0xFFFF;
		break;
	default:
		upper_limit = 0;
	}
	if (uni <= upper_limit)
		return(1);
	else
		return(0);
}

emit_utf8_char(uni, outp)
	unsigned uni;
	u_char *outp;
{
	if (uni < 0x80) {
		*outp = uni;
		return(1);
	}
	if (uni < 0x800) {
		outp[0] = 0xC0 | (uni >> 6);
		outp[1] = 0x80 | (uni & 0x3F);
		return(2);
	}
	outp[0] = 0xE0 | (uni >> 12);
	outp[1] = 0x80 | ((uni >> 6) & 0x3F);
	outp[2] = 0x80 | (uni & 0x3F);
	return(3);
}