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	utf8-encode.c - libgrapheme - unicode string library
	git clone git://git.suckless.org/libgrapheme
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	---
	utf8-encode.c (2238B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <stddef.h>
	3 #include <stdint.h>
	4 #include <stdio.h>
	5 #include <string.h>
	6
	7 #include "../grapheme.h"
	8 #include "util.h"
	9
	10 static const struct {
	11 uint_least32_t cp; /* input codepoint */
	12 char exp_arr; / expected UTF-8 byte sequence */
	13 size_t exp_len; /* expected length of UTF-8 sequence */
	14 } enc_test[] = {
	15 {
	16 /* invalid codepoint (UTF-16 surrogate half) */
	17 .cp = UINT32_C(0xD800),
	18 .exp_arr = (char *)(unsigned char[]) { 0xEF, 0xBF, 0xBD …
	19 .exp_len = 3,
	20 },
	21 {
	22 /* invalid codepoint (UTF-16-unrepresentable) */
	23 .cp = UINT32_C(0x110000),
	24 .exp_arr = (char *)(unsigned char[]) { 0xEF, 0xBF, 0xBD …
	25 .exp_len = 3,
	26 },
	27 {
	28 /* codepoint encoded to a 1-byte sequence */
	29 .cp = 0x01,
	30 .exp_arr = (char *)(unsigned char[]) { 0x01 },
	31 .exp_len = 1,
	32 },
	33 {
	34 /* codepoint encoded to a 2-byte sequence */
	35 .cp = 0xFF,
	36 .exp_arr = (char *)(unsigned char[]) { 0xC3, 0xBF },
	37 .exp_len = 2,
	38 },
	39 {
	40 /* codepoint encoded to a 3-byte sequence */
	41 .cp = 0xFFF,
	42 .exp_arr = (char *)(unsigned char[]) { 0xE0, 0xBF, 0xBF …
	43 .exp_len = 3,
	44 },
	45 {
	46 /* codepoint encoded to a 4-byte sequence */
	47 .cp = UINT32_C(0xFFFFF),
	48 .exp_arr = (char *)(unsigned char[]) { 0xF3, 0xBF, 0xBF,…
	49 .exp_len = 4,
	50 },
	51 };
	52
	53 int
	54 main(int argc, char *argv[])
	55 {
	56 size_t i, j, failed;
	57
	58 (void)argc;
	59
	60 /* UTF-8 encoder test */
	61 for (i = 0, failed = 0; i < LEN(enc_test); i++) {
	62 char arr[4];
	63 size_t len;
	64
	65 len = grapheme_encode_utf8(enc_test[i].cp, arr, LEN(arr)…
	66
	67 if (len != enc_test[i].exp_len \|\|
	68 memcmp(arr, enc_test[i].exp_arr, len)) {
	69 fprintf(stderr,
	70 "%s, Failed test %zu: "
	71 "Expected (",
	72 argv[0], i);
	73 for (j = 0; j < enc_test[i].exp_len; j++) {
	74 fprintf(stderr, "0x%x", enc_test[i].exp_…
	75 if (j + 1 < enc_test[i].exp_len) {
	76 fprintf(stderr, " ");
	77 }
	78 }
	79 fprintf(stderr, "), but got (");
	80 for (j = 0; j < len; j++) {
	81 fprintf(stderr, "0x%x", arr[j]);
	82 if (j + 1 < len) {
	83 fprintf(stderr, " ");
	84 }
	85 }
	86 fprintf(stderr, ").\n");
	87 failed++;
	88 }
	89 }
	90 printf("%s: %zu/%zu unit tests passed.\n", argv[0],
	91 LEN(enc_test) - failed, LEN(enc_test));
	92
	93 return (failed > 0) ? 1 : 0;
	94 }