shithub: rgbds

ref: 2e0991f32bc043793d2ca1c6b7ababd1c6a6a40f
dir: /src/asm/util.c/

/*
 * This file is part of RGBDS.
 *
 * Copyright (c) 1997-2019, Carsten Sorensen and RGBDS contributors.
 *
 * SPDX-License-Identifier: MIT
 */

#include <ctype.h>
#include <stdint.h>

#include "asm/main.h"
#include "asm/util.h"
#include "asm/warning.h"

#include "extern/utf8decoder.h"

char const *printChar(int c)
{
	// "'A'" + '\0': 4 bytes
	// "'\\n'" + '\0': 5 bytes
	// "0xFF" + '\0': 5 bytes
	static char buf[5];

	if (c == EOF)
		return "EOF";

	if (isprint(c)) {
		buf[0] = '\'';
		buf[1] = c;
		buf[2] = '\'';
		buf[3] = '\0';
		return buf;
	}

	switch (c) {
	case '\n':
		buf[2] = 'n';
		break;
	case '\r':
		buf[2] = 'r';
		break;
	case '\t':
		buf[2] = 't';
		break;

	default: /* Print as hex */
		buf[0] = '0';
		buf[1] = 'x';
		snprintf(&buf[2], 3, "%02hhX", (uint8_t)c); // includes the '\0'
		return buf;
	}
	buf[0] = '\'';
	buf[1] = '\\';
	buf[3] = '\'';
	buf[4] = '\0';
	return buf;
}

size_t readUTF8Char(uint8_t *dest, char const *src)
{
	uint32_t state = 0;
	uint32_t codep;
	size_t i = 0;

	for (;;) {
		if (decode(&state, &codep, src[i]) == 1)
			return 0;

		if (dest)
			dest[i] = src[i];
		i++;

		if (state == 0)
			return i;
	}
}