/* count of characters used to encode one unicode char */
static int utf8_encoded_expected_len(const char *str) {
- unsigned char c = (unsigned char)str[0];
+ unsigned char c;
+ assert(str);
+
+ c = (unsigned char) str[0];
if (c < 0x80)
return 1;
if ((c & 0xe0) == 0xc0)
return 5;
if ((c & 0xfe) == 0xfc)
return 6;
+
return 0;
}
/* decode one unicode char */
-static int utf8_encoded_to_unichar(const char *str) {
- int unichar;
- int len;
- int i;
+int utf8_encoded_to_unichar(const char *str) {
+ int unichar, len, i;
+
+ assert(str);
len = utf8_encoded_expected_len(str);
+
switch (len) {
case 1:
return (int)str[0];
unichar = (int)str[0] & 0x01;
break;
default:
- return -1;
+ return -EINVAL;
}
for (i = 1; i < len; i++) {
if (((int)str[i] & 0xc0) != 0x80)
- return -1;
+ return -EINVAL;
unichar <<= 6;
unichar |= (int)str[i] & 0x3f;
}
return unichar;
}
-bool utf8_is_printable(const char* str, size_t length) {
+bool utf8_is_printable_newline(const char* str, size_t length, bool newline) {
const uint8_t *p;
assert(str);
for (p = (const uint8_t*) str; length;) {
- int encoded_len = utf8_encoded_valid_unichar((const char *)p);
- int val = utf8_encoded_to_unichar((const char*)p);
+ int encoded_len, val;
+
+ encoded_len = utf8_encoded_valid_unichar((const char *) p);
+ val = utf8_encoded_to_unichar((const char*) p);
- if (encoded_len < 0 || val < 0 || is_unicode_control(val))
+ if (encoded_len < 0 ||
+ val < 0 ||
+ is_unicode_control(val) ||
+ (!newline && val == '\n'))
return false;
length -= encoded_len;
assert(str);
for (p = (const uint8_t*) str; *p; ) {
- int len = utf8_encoded_valid_unichar((const char *)p);
+ int len;
+ len = utf8_encoded_valid_unichar((const char *)p);
if (len < 0)
return NULL;
return str;
}
-char *ascii_is_valid(const char *str) {
- const char *p;
+char *utf8_escape_invalid(const char *str) {
+ char *p, *s;
assert(str);
- for (p = str; *p; p++)
- if ((unsigned char) *p >= 128)
- return NULL;
+ p = s = malloc(strlen(str) * 4 + 1);
+ if (!p)
+ return NULL;
- return (char*) str;
-}
+ while (*str) {
+ int len;
-char *ascii_filter(const char *str) {
- const char *s;
- char *r, *d;
- size_t l;
+ len = utf8_encoded_valid_unichar(str);
+ if (len > 0) {
+ s = mempcpy(s, str, len);
+ str += len;
+ } else {
+ s = mempcpy(s, UTF8_REPLACEMENT_CHARACTER, strlen(UTF8_REPLACEMENT_CHARACTER));
+ str += 1;
+ }
+ }
- assert(str);
+ *s = '\0';
- l = strlen(str);
- r = malloc(l + 1);
- if (!r)
- return NULL;
+ return p;
+}
- for (s = str, d = r; *s; s++)
- if ((unsigned char) *s < 128)
- *(d++) = *s;
+char *ascii_is_valid(const char *str) {
+ const char *p;
- *d = 0;
+ assert(str);
- return r;
+ for (p = str; *p; p++)
+ if ((unsigned char) *p >= 128)
+ return NULL;
+
+ return (char*) str;
}
char *utf16_to_utf8(const void *s, size_t length) {
/* expected size used to encode one unicode char */
static int utf8_unichar_to_encoded_len(int unichar) {
+
if (unichar < 0x80)
return 1;
if (unichar < 0x800)
return 4;
if (unichar < 0x4000000)
return 5;
+
return 6;
}
/* validate one encoded unicode char and return its length */
int utf8_encoded_valid_unichar(const char *str) {
- int len;
- int unichar;
- int i;
+ int len, unichar, i;
+
+ assert(str);
len = utf8_encoded_expected_len(str);
if (len == 0)
- return -1;
+ return -EINVAL;
/* ascii is valid */
if (len == 1)
/* check if expected encoded chars are available */
for (i = 0; i < len; i++)
if ((str[i] & 0x80) != 0x80)
- return -1;
+ return -EINVAL;
unichar = utf8_encoded_to_unichar(str);
/* check if encoded length matches encoded value */
if (utf8_unichar_to_encoded_len(unichar) != len)
- return -1;
+ return -EINVAL;
/* check if value has valid range */
if (!is_unicode_valid(unichar))
- return -1;
+ return -EINVAL;
return len;
}