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Diffstat (limited to 'src/shared/utf8.c')
-rw-r--r--src/shared/utf8.c45
1 files changed, 28 insertions, 17 deletions
diff --git a/src/shared/utf8.c b/src/shared/utf8.c
index c559c13678..9353559b76 100644
--- a/src/shared/utf8.c
+++ b/src/shared/utf8.c
@@ -80,8 +80,11 @@ static bool is_unicode_control(uint32_t ch) {
/* 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)
@@ -94,16 +97,18 @@ static int utf8_encoded_expected_len(const char *str) {
return 5;
if ((c & 0xfe) == 0xfc)
return 6;
+
return 0;
}
/* decode one unicode char */
int utf8_encoded_to_unichar(const char *str) {
- int unichar;
- int len;
- int i;
+ int unichar, len, i;
+
+ assert(str);
len = utf8_encoded_expected_len(str);
+
switch (len) {
case 1:
return (int)str[0];
@@ -123,12 +128,12 @@ int utf8_encoded_to_unichar(const char *str) {
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;
}
@@ -142,10 +147,14 @@ bool utf8_is_printable_newline(const char* str, size_t length, bool newline) {
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;
@@ -165,7 +174,6 @@ const char *utf8_is_valid(const char *str) {
int len;
len = utf8_encoded_valid_unichar((const char *)p);
-
if (len < 0)
return NULL;
@@ -196,6 +204,7 @@ char *utf8_escape_invalid(const char *str) {
str += 1;
}
}
+
*s = '\0';
return p;
@@ -251,6 +260,7 @@ 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)
@@ -261,18 +271,19 @@ static int utf8_unichar_to_encoded_len(int unichar) {
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)
@@ -281,17 +292,17 @@ int utf8_encoded_valid_unichar(const char *str) {
/* 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;
}