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string.c
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string.c
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/*
* MacRuby Strings.
*
* This file is covered by the Ruby license. See COPYING for more details.
*
* Copyright (C) 2007-2010, Apple Inc. All rights reserved.
* Copyright (C) 1993-2007 Yukihiro Matsumoto
* Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
* Copyright (C) 2000 Information-technology Promotion Agency, Japan
*/
#include <stdio.h>
#include <stdarg.h>
#include <wctype.h>
#include <unistd.h>
#include "ruby/macruby.h"
#include "ruby/encoding.h"
#include "encoding.h"
#include "re.h"
#include "objc.h"
#include "id.h"
#include "ruby/node.h"
#include "vm.h"
#include "class.h"
#include <unicode/unum.h>
#include <unicode/utrans.h>
VALUE rb_cRubyString;
VALUE rb_fs;
// rb_str_t primitives.
static void
str_update_flags_utf16(rb_str_t *self)
{
assert(str_is_stored_in_uchars(self)
|| NON_NATIVE_UTF16_ENC(self->encoding));
bool ascii_only = true;
bool has_supplementary = false;
bool valid_encoding = true;
// if the length is an odd number, it can't be valid UTF-16
if (ODD_NUMBER(self->length_in_bytes)) {
valid_encoding = false;
}
UChar *uchars = self->data.uchars;
long uchars_count = BYTES_TO_UCHARS(self->length_in_bytes);
bool native_byte_order = str_is_stored_in_uchars(self);
UChar32 lead = 0;
for (int i = 0; i < uchars_count; ++i) {
UChar32 c;
if (native_byte_order) {
c = uchars[i];
}
else {
uint8_t *bytes = (uint8_t *)&uchars[i];
c = (uint16_t)bytes[0] << 8 | (uint16_t)bytes[1];
}
if (U16_IS_SURROGATE(c)) { // surrogate
if (U16_IS_SURROGATE_LEAD(c)) { // lead surrogate
// a lead surrogate should not be
// after an other lead surrogate
if (lead != 0) {
valid_encoding = false;
}
lead = c;
}
else { // trail surrogate
// a trail surrogate must follow a lead surrogate
if (lead == 0) {
valid_encoding = false;
}
else {
has_supplementary = true;
c = U16_GET_SUPPLEMENTARY(lead, c);
if (!U_IS_UNICODE_CHAR(c)) {
valid_encoding = false;
}
}
lead = 0;
}
}
else { // not a surrogate
// a non-surrogate character should not be after a lead surrogate
// and it should be a valid Unicode character
// Warning: Ruby 1.9 does not do the IS_UNICODE_CHAR check
// (for 1.9, 0xffff is valid though it's not a Unicode character)
if ((lead != 0) || !U_IS_UNICODE_CHAR(c)) {
valid_encoding = false;
}
if (c > 127) {
ascii_only = false;
}
}
}
// the last character should not be a lead surrogate
if (lead != 0) {
valid_encoding = false;
}
str_set_has_supplementary(self, has_supplementary);
if (valid_encoding) {
str_set_valid_encoding(self, true);
str_set_ascii_only(self, ascii_only);
}
else {
str_set_valid_encoding(self, false);
str_set_ascii_only(self, false);
}
}
void
str_update_flags(rb_str_t *self)
{
if (self->length_in_bytes == 0) {
str_set_valid_encoding(self, true);
str_set_ascii_only(self, true);
str_set_has_supplementary(self, false);
}
else if (BINARY_ENC(self->encoding)) {
str_set_valid_encoding(self, true);
str_set_has_supplementary(self, false);
bool ascii_only = true;
for (long i = 0; i < self->length_in_bytes; ++i) {
if ((uint8_t)self->data.bytes[i] > 127) {
ascii_only = false;
break;
}
}
str_set_ascii_only(self, ascii_only);
}
else if (str_is_stored_in_uchars(self) || UTF16_ENC(self->encoding)) {
str_update_flags_utf16(self);
}
else {
self->encoding->methods.update_flags(self);
}
}
static void
str_invert_byte_order(rb_str_t *self)
{
assert(NON_NATIVE_UTF16_ENC(self->encoding));
long length_in_bytes = self->length_in_bytes;
char *bytes = self->data.bytes;
if (ODD_NUMBER(length_in_bytes)) {
--length_in_bytes;
}
for (long i = 0; i < length_in_bytes; i += 2) {
char tmp = bytes[i];
bytes[i] = bytes[i+1];
bytes[i+1] = tmp;
}
str_negate_stored_in_uchars(self);
}
static rb_encoding_t *
str_compatible_encoding(rb_str_t *str1, rb_str_t *str2)
{
if (str1->encoding == str2->encoding) {
return str1->encoding;
}
if (str2->length_in_bytes == 0) {
return str1->encoding;
}
if (str1->length_in_bytes == 0) {
return str2->encoding;
}
if (!str1->encoding->ascii_compatible
|| !str2->encoding->ascii_compatible) {
return NULL;
}
if (str_is_ruby_ascii_only(str2)) {
return str1->encoding;
}
return NULL;
}
static rb_encoding_t *
str_must_have_compatible_encoding(rb_str_t *str1, rb_str_t *str2)
{
rb_encoding_t *new_encoding = str_compatible_encoding(str1, str2);
if (new_encoding == NULL) {
rb_raise(rb_eEncCompatError,
"incompatible character encodings: %s and %s",
str1->encoding->public_name, str2->encoding->public_name);
}
return new_encoding;
}
static rb_str_t *
str_alloc(VALUE klass)
{
assert(rb_klass_is_rstr(klass));
assert(klass != 0);
NEWOBJ(str, rb_str_t);
str->basic.flags = 0;
str->basic.klass = klass;
str->encoding = rb_encodings[ENCODING_UTF8];
str->capacity_in_bytes = 0;
str->length_in_bytes = 0;
str->data.bytes = NULL;
str->flags = 0;
return str;
}
static VALUE
str_new(void)
{
return (VALUE)str_alloc(rb_cRubyString);
}
static VALUE
str_new_like(VALUE obj)
{
return (VALUE)str_alloc(rb_obj_class(obj));
}
static void
str_replace_with_bytes(rb_str_t *self, const char *bytes, long len,
rb_encoding_t *enc)
{
assert(len >= 0);
assert(enc != NULL);
self->flags = 0;
self->encoding = enc;
self->capacity_in_bytes = len;
if (len > 0) {
GC_WB(&self->data.bytes, xmalloc(len));
if (bytes != NULL) {
memcpy(self->data.bytes, bytes, len);
self->length_in_bytes = len;
}
else {
self->length_in_bytes = 0;
}
}
else {
self->data.bytes = NULL;
self->length_in_bytes = 0;
}
}
void
str_replace_with_string(rb_str_t *self, rb_str_t *source)
{
if (self == source) {
return;
}
str_replace_with_bytes(self, source->data.bytes, source->length_in_bytes,
source->encoding);
self->flags = source->flags;
}
static bool str_try_making_data_uchars(rb_str_t *self);
static void
str_append_uchar(rb_str_t *self, UChar c)
{
assert(str_try_making_data_uchars(self));
const long uchar_cap = BYTES_TO_UCHARS(self->capacity_in_bytes);
const long uchar_len = BYTES_TO_UCHARS(self->length_in_bytes);
if (uchar_len + 1 >= uchar_cap) {
assert(uchar_len + 1 < uchar_cap + 10);
self->capacity_in_bytes += UCHARS_TO_BYTES(10);
UChar *uchars = (UChar *)xrealloc(self->data.uchars,
self->capacity_in_bytes);
if (uchars != self->data.uchars) {
GC_WB(&self->data.uchars, uchars);
}
}
self->data.uchars[uchar_len] = c;
self->length_in_bytes += UCHARS_TO_BYTES(1);
}
static void
str_replace_with_uchars(rb_str_t *self, const UChar *chars, long len)
{
assert(len >= 0);
len = UCHARS_TO_BYTES(len);
self->flags = 0;
self->encoding = rb_encodings[ENCODING_UTF8];
self->capacity_in_bytes = len;
if (len > 0) {
GC_WB(&self->data.uchars, xmalloc(len));
if (chars != NULL) {
memcpy(self->data.uchars, chars, len);
self->length_in_bytes = len;
}
else {
self->length_in_bytes = 0;
}
str_set_stored_in_uchars(self, true);
}
else {
self->data.uchars = NULL;
self->length_in_bytes = 0;
}
}
static void
str_replace_with_cfstring(rb_str_t *self, CFStringRef source)
{
const long len = CFStringGetLength(source);
UniChar *chars = NULL;
if (len > 0) {
chars = (UniChar *)malloc(sizeof(UniChar) * len);
CFStringGetCharacters(source, CFRangeMake(0, len), chars);
}
str_replace_with_uchars(self, chars, len);
if (chars != NULL) {
free(chars);
}
}
static void
str_replace(rb_str_t *self, VALUE arg)
{
switch (TYPE(arg)) {
case T_STRING:
if (IS_RSTR(arg)) {
str_replace_with_string(self, RSTR(arg));
}
else {
str_replace_with_cfstring(self, (CFStringRef)arg);
}
break;
default:
str_replace(self, rb_str_to_str(arg));
break;
}
}
static rb_str_t *
str_dup(rb_str_t *source)
{
rb_str_t *destination = str_alloc(rb_cRubyString);
str_replace_with_string(destination, source);
return destination;
}
static rb_str_t *
str_new_from_cfstring(CFStringRef source)
{
rb_str_t *destination = str_alloc(rb_cRubyString);
str_replace_with_cfstring(destination, source);
return destination;
}
static void
str_make_data_binary(rb_str_t *self)
{
if (!str_is_stored_in_uchars(self) || NATIVE_UTF16_ENC(self->encoding)) {
// nothing to do
return;
}
if (NON_NATIVE_UTF16_ENC(self->encoding)) {
// Doing the conversion ourself is faster, and anyway ICU's converter
// does not like non-paired surrogates.
str_invert_byte_order(self);
return;
}
self->encoding->methods.make_data_binary(self);
}
static bool
str_try_making_data_uchars(rb_str_t *self)
{
if (str_is_stored_in_uchars(self)) {
return true;
}
else if (NATIVE_UTF16_ENC(self->encoding)) {
// sometimes the flag might not already be set so set it
str_set_stored_in_uchars(self, true);
return true;
}
else if (NON_NATIVE_UTF16_ENC(self->encoding)) {
str_invert_byte_order(self);
return true;
}
else if (BINARY_ENC(self->encoding)) {
// you can't convert binary to anything
return false;
}
else if (self->length_in_bytes == 0) {
// for empty strings, nothing to convert
str_set_stored_in_uchars(self, true);
return true;
}
else if (str_known_to_have_an_invalid_encoding(self)) {
return false;
}
return self->encoding->methods.try_making_data_uchars(self);
}
static void
str_make_same_format(rb_str_t *str1, rb_str_t *str2)
{
if (str_is_stored_in_uchars(str1) != str_is_stored_in_uchars(str2)) {
if (str_is_stored_in_uchars(str1)) {
if (!str_try_making_data_uchars(str2)) {
str_make_data_binary(str1);
}
}
else {
str_make_data_binary(str2);
}
}
}
static long
str_length(rb_str_t *self, bool ucs2_mode)
{
if (self->length_in_bytes == 0) {
return 0;
}
if (str_try_making_data_uchars(self)) {
long length;
if (ucs2_mode) {
length = BYTES_TO_UCHARS(self->length_in_bytes);
}
else {
// we must return the length in Unicode code points,
// not the number of UChars, even if the probability
// we have surrogates is very low
length = u_countChar32(self->data.uchars,
BYTES_TO_UCHARS(self->length_in_bytes));
}
if (ODD_NUMBER(self->length_in_bytes)) {
return length + 1;
}
else {
return length;
}
}
else {
if (self->encoding->single_byte_encoding) {
return self->length_in_bytes;
}
else if (ucs2_mode && NON_NATIVE_UTF16_ENC(self->encoding)) {
return div_round_up(self->length_in_bytes, 2);
}
else {
return self->encoding->methods.length(self, ucs2_mode);
}
}
}
static UChar
str_get_uchar(rb_str_t *self, long pos, bool ucs2_mode)
{
assert(pos >= 0 && pos < str_length(self, ucs2_mode));
if (str_try_making_data_uchars(self)) {
// FIXME: Not ucs2 compliant.
return self->data.uchars[pos];
}
//assert(BINARY_ENC(self->encoding));
return self->data.bytes[pos];
}
static long
str_bytesize(rb_str_t *self)
{
if (str_is_stored_in_uchars(self)) {
if (UTF16_ENC(self->encoding)) {
return self->length_in_bytes;
}
else {
return self->encoding->methods.bytesize(self);
}
}
else {
return self->length_in_bytes;
}
}
static rb_str_t *
str_new_similar_empty_string(rb_str_t *self)
{
rb_str_t *str = str_alloc(rb_cRubyString);
str->encoding = self->encoding;
str->flags = self->flags & STRING_REQUIRED_FLAGS;
return str;
}
static rb_str_t *
str_new_copy_of_part(rb_str_t *self, long offset_in_bytes,
long length_in_bytes)
{
rb_str_t *str = str_alloc(rb_cRubyString);
str->encoding = self->encoding;
str->capacity_in_bytes = str->length_in_bytes = length_in_bytes;
str->flags = self->flags & STRING_REQUIRED_FLAGS;
GC_WB(&str->data.bytes, xmalloc(length_in_bytes));
memcpy(str->data.bytes, &self->data.bytes[offset_in_bytes],
length_in_bytes);
return str;
}
// you cannot cut a surrogate in an encoding that is not UTF-16
// (it's in theory possible to store the surrogate in
// UTF-8 or UTF-32 but that would be incorrect Unicode)
NORETURN(static void
str_cannot_cut_surrogate(void))
{
rb_raise(rb_eIndexError, "You can't cut a surrogate in two in an encoding that is not UTF-16");
}
static character_boundaries_t
str_get_character_boundaries(rb_str_t *self, long index, bool ucs2_mode)
{
character_boundaries_t boundaries = {-1, -1};
if (str_is_stored_in_uchars(self)) {
if (ucs2_mode || str_known_not_to_have_any_supplementary(self)) {
if (index < 0) {
index += div_round_up(self->length_in_bytes, 2);
if (index < 0) {
return boundaries;
}
}
boundaries.start_offset_in_bytes = UCHARS_TO_BYTES(index);
boundaries.end_offset_in_bytes = boundaries.start_offset_in_bytes
+ 2;
if (!UTF16_ENC(self->encoding)) {
long length = BYTES_TO_UCHARS(self->length_in_bytes);
if ((index < length)
&& U16_IS_SURROGATE(self->data.uchars[index])) {
if (U16_IS_SURROGATE_LEAD(self->data.uchars[index])) {
boundaries.end_offset_in_bytes = -1;
}
else { // U16_IS_SURROGATE_TRAIL
boundaries.start_offset_in_bytes = -1;
}
}
}
}
else {
// we don't have the length of the string, just the number of
// UChars (uchars_count >= number of characters)
long uchars_count = BYTES_TO_UCHARS(self->length_in_bytes);
if ((index < -uchars_count) || (index >= uchars_count)) {
return boundaries;
}
const UChar *uchars = self->data.uchars;
long offset;
if (index < 0) {
// count the characters from the end
offset = uchars_count;
while ((offset > 0) && (index < 0)) {
--offset;
// if the next character is a paired surrogate
// we need to go to the start of the whole surrogate
if (U16_IS_TRAIL(uchars[offset]) && (offset > 0)
&& U16_IS_LEAD(uchars[offset-1])) {
--offset;
}
++index;
}
// ended before the index got to 0
if (index != 0) {
return boundaries;
}
assert(offset >= 0);
}
else {
// count the characters from the start
offset = 0;
U16_FWD_N(uchars, offset, uchars_count, index);
if (offset >= uchars_count) {
return boundaries;
}
}
long length_in_bytes;
if (U16_IS_LEAD(uchars[offset]) && (offset < uchars_count - 1)
&& (U16_IS_TRAIL(uchars[offset+1]))) {
// if it's a lead surrogate we must also copy the trail
// surrogate
length_in_bytes = UCHARS_TO_BYTES(2);
}
else {
length_in_bytes = UCHARS_TO_BYTES(1);
}
boundaries.start_offset_in_bytes = UCHARS_TO_BYTES(offset);
boundaries.end_offset_in_bytes = boundaries.start_offset_in_bytes
+ length_in_bytes;
}
}
else { // data in binary
if (self->encoding->single_byte_encoding) {
if (index < 0) {
index += self->length_in_bytes;
if (index < 0) {
return boundaries;
}
}
boundaries.start_offset_in_bytes = index;
boundaries.end_offset_in_bytes = boundaries.start_offset_in_bytes
+ 1;
}
else if (UTF32_ENC(self->encoding)
&& (!ucs2_mode
|| str_known_not_to_have_any_supplementary(self))) {
if (index < 0) {
index += div_round_up(self->length_in_bytes, 4);
if (index < 0) {
return boundaries;
}
}
boundaries.start_offset_in_bytes = index * 4;
boundaries.end_offset_in_bytes = boundaries.start_offset_in_bytes
+ 4;
}
else if (NON_NATIVE_UTF16_ENC(self->encoding)
&& (ucs2_mode
|| str_known_not_to_have_any_supplementary(self))) {
if (index < 0) {
index += div_round_up(self->length_in_bytes, 2);
if (index < 0) {
return boundaries;
}
}
boundaries.start_offset_in_bytes = UCHARS_TO_BYTES(index);
boundaries.end_offset_in_bytes = boundaries.start_offset_in_bytes
+ 2;
}
else {
boundaries = self->encoding->methods.get_character_boundaries(self,
index, ucs2_mode);
}
}
return boundaries;
}
static rb_str_t *
str_get_characters(rb_str_t *self, long first, long last, bool ucs2_mode)
{
if (self->length_in_bytes == 0) {
if (first == 0) {
return str_new_similar_empty_string(self);
}
else {
return NULL;
}
}
if (!self->encoding->single_byte_encoding
&& !str_is_stored_in_uchars(self)) {
str_try_making_data_uchars(self);
}
character_boundaries_t first_boundaries =
str_get_character_boundaries(self, first, ucs2_mode);
character_boundaries_t last_boundaries =
str_get_character_boundaries(self, last, ucs2_mode);
if (first_boundaries.start_offset_in_bytes == -1) {
if (last_boundaries.end_offset_in_bytes == -1) {
// you cannot cut a surrogate in an encoding that is not UTF-16
str_cannot_cut_surrogate();
}
else {
return NULL;
}
}
else if (last_boundaries.end_offset_in_bytes == -1) {
// you cannot cut a surrogate in an encoding that is not UTF-16
str_cannot_cut_surrogate();
}
if (first_boundaries.start_offset_in_bytes == self->length_in_bytes) {
return str_new_similar_empty_string(self);
}
else if (first_boundaries.start_offset_in_bytes > self->length_in_bytes) {
return NULL;
}
if (last_boundaries.end_offset_in_bytes >= self->length_in_bytes) {
last_boundaries.end_offset_in_bytes = self->length_in_bytes;
}
return str_new_copy_of_part(self, first_boundaries.start_offset_in_bytes,
last_boundaries.end_offset_in_bytes
- first_boundaries.start_offset_in_bytes);
}
static void
str_resize_bytes(rb_str_t *self, long new_capacity)
{
if (new_capacity < 0) {
rb_raise(rb_eArgError, "negative string size (or size too big)");
}
if (self->capacity_in_bytes < new_capacity) {
if (self->data.bytes == NULL) {
GC_WB(&self->data.bytes, xmalloc(new_capacity));
}
else {
char *bytes = xrealloc(self->data.bytes, new_capacity);
if (bytes != self->data.bytes) {
GC_WB(&self->data.bytes, bytes);
}
}
self->capacity_in_bytes = new_capacity;
}
}
static void
str_ensure_null_terminator(rb_str_t *self)
{
assert(!str_is_stored_in_uchars(self) || NATIVE_UTF16_ENC(self->encoding));
if (self->length_in_bytes > 0
&& (self->capacity_in_bytes == self->length_in_bytes
|| self->data.bytes[self->length_in_bytes] != '\0')) {
str_resize_bytes(self, self->length_in_bytes + 1);
self->data.bytes[self->length_in_bytes] = '\0';
}
}
static void
str_splice(rb_str_t *self, long pos, long len, rb_str_t *str, bool ucs2_mode)
{
// self[pos..pos+len] = str
assert(pos >= 0 && len >= 0);
if (str != NULL) {
str_must_have_compatible_encoding(self, str);
str_make_same_format(self, str);
}
character_boundaries_t beg, end;
if (pos + len == 0) {
// Positioning before the string.
const long offset = 0;
beg.start_offset_in_bytes = beg.end_offset_in_bytes = offset;
end.start_offset_in_bytes = end.end_offset_in_bytes = offset;
}
else if (len == 0 && str_length(self, ucs2_mode) == pos) {
// Positioning after the string.
const long offset = self->length_in_bytes;
beg.start_offset_in_bytes = beg.end_offset_in_bytes = offset;
end.start_offset_in_bytes = end.end_offset_in_bytes = offset;
}
else {
// Positioning in the string.
beg = str_get_character_boundaries(self, pos, ucs2_mode);
// TODO: probably call str_cannot_cut_surrogate()
assert(beg.start_offset_in_bytes != -1);
assert(beg.end_offset_in_bytes != -1);
end = str_get_character_boundaries(self, pos + len - 1, ucs2_mode);
// TODO: probably call str_cannot_cut_surrogate()
assert(end.start_offset_in_bytes != -1);
assert(end.end_offset_in_bytes != -1);
}
const long bytes_to_splice = end.end_offset_in_bytes
- beg.start_offset_in_bytes;
long bytes_to_add = 0;
if (str != NULL) {
if (str->length_in_bytes > bytes_to_splice) {
str_resize_bytes(self, self->length_in_bytes
+ (str->length_in_bytes - bytes_to_splice));
}
bytes_to_add = str->length_in_bytes;
}
if (beg.start_offset_in_bytes == end.end_offset_in_bytes
&& end.end_offset_in_bytes == self->length_in_bytes) {
if (bytes_to_add > 0) {
// We are splicing at the very end.
memcpy(self->data.bytes + self->length_in_bytes, str->data.bytes,
bytes_to_add);
}
}
else {
// We are splicing in the middle.
memmove(self->data.bytes + beg.start_offset_in_bytes + bytes_to_add,
self->data.bytes + end.end_offset_in_bytes,
self->length_in_bytes - end.end_offset_in_bytes);
if (bytes_to_add > 0) {
memcpy(self->data.bytes + beg.start_offset_in_bytes,
str->data.bytes, bytes_to_add);
}
}
self->length_in_bytes = self->length_in_bytes - bytes_to_splice
+ bytes_to_add;
}
static void
str_delete(rb_str_t *self, long pos, long len, bool ucs2_mode)
{
str_splice(self, pos, len, NULL, ucs2_mode);
}
static void
str_insert(rb_str_t *self, long pos, rb_str_t *str, bool ucs2_mode)
{
str_splice(self, pos, 0, str, ucs2_mode);
}
static void
str_concat_bytes(rb_str_t *self, const char *bytes, long len)
{
assert(bytes != NULL && len >= 0);
const long new_length_in_bytes = self->length_in_bytes + len;
str_resize_bytes(self, new_length_in_bytes);
memcpy(self->data.bytes + self->length_in_bytes, bytes, len);
self->length_in_bytes = new_length_in_bytes;
}
static void
str_concat_uchars(rb_str_t *self, const UChar *chars, long len)
{
if (str_try_making_data_uchars(self)) {
str_concat_bytes(self, (const char *)chars, UCHARS_TO_BYTES(len));
}
else {
assert(BINARY_ENC(RSTR(self)->encoding));
const long new_length_in_bytes = RSTR(self)->length_in_bytes + len;
str_resize_bytes(self, new_length_in_bytes);
char *ptr = (RSTR(self)->data.bytes + RSTR(self)->length_in_bytes);
for (int i = 0; i < len; ++i) {
ptr[i] = chars[i];
}
self->length_in_bytes = new_length_in_bytes;
}
}
static void
str_concat_string(rb_str_t *self, rb_str_t *str)
{
if (str->length_in_bytes == 0) {
return;
}
str_must_have_compatible_encoding(self, str);
str_make_same_format(self, str);
// TODO: we should maybe merge flags
// (if both are ASCII-only, the concatenation is ASCII-only,
// though I'm not sure all the tests required are worth doing)
str_unset_facultative_flags(self);
str_concat_bytes(self, str->data.bytes, str->length_in_bytes);
}
static int
str_compare(rb_str_t *self, rb_str_t *str)
{
if (self == str) {
return 0;
}
if (self->length_in_bytes == 0 && str->length_in_bytes == 0) {
// both strings are empty
return 0;
}
if (str_compatible_encoding(self, str) == NULL) {
// incompatible encodings
return -1;
}
str_make_same_format(self, str);
const long min_len = self->length_in_bytes < str->length_in_bytes
? self->length_in_bytes : str->length_in_bytes;
const int res = memcmp(self->data.bytes, str->data.bytes, min_len);
if (res == 0) {
if (self->length_in_bytes == str->length_in_bytes) {
return 0;
}
return self->length_in_bytes > str->length_in_bytes
? 1 : -1;
}
return res > 0 ? 1 : -1;
}
static int
str_case_compare(rb_str_t *self, rb_str_t *str)
{
if (self == str) {
return 0;
}
if (self->length_in_bytes == 0 && str->length_in_bytes == 0) {
// both strings are empty
return 0;
}
if (str_compatible_encoding(self, str) == NULL) {
// incompatible encodings
return -1;
}
str_make_same_format(self, str);
const long min_length = self->length_in_bytes < str->length_in_bytes
? self->length_in_bytes : str->length_in_bytes;
if (str_is_stored_in_uchars(str)) {
for (long i = 0; i < BYTES_TO_UCHARS(min_length); i++) {
UChar c1 = self->data.uchars[i];
UChar c2 = str->data.uchars[i];
if (c1 != c2) {
c1 = isascii(c1) ? toupper(c1) : c1;
c2 = isascii(c2) ? toupper(c2) : c2;
if (c1 != c2) {
return c1 < c2 ? -1 : 1;
}
}
}
}
else {
for (long i = 0; i < min_length; i++) {
char c1 = self->data.bytes[i];
char c2 = str->data.bytes[i];
if (c1 != c2) {
c1 = isascii(c1) ? toupper(c1) : c1;
c2 = isascii(c2) ? toupper(c2) : c2;
if (c1 != c2) {
return c1 < c2 ? -1 : 1;
}
}
}
}
if (self->length_in_bytes == str->length_in_bytes) {
return 0;
}
return self->length_in_bytes > str->length_in_bytes ? 1 : -1;
}
static long
str_offset_in_bytes_to_index(rb_str_t *self, long offset_in_bytes,
bool ucs2_mode)
{
if ((offset_in_bytes >= self->length_in_bytes) || (offset_in_bytes < 0)) {
return -1;
}
if (offset_in_bytes == 0) {
return 0;
}
if (str_is_stored_in_uchars(self)) {
if (ucs2_mode || str_known_not_to_have_any_supplementary(self)) {
return BYTES_TO_UCHARS(offset_in_bytes);
}
else {
long length = BYTES_TO_UCHARS(self->length_in_bytes);
long offset_in_uchars = BYTES_TO_UCHARS(offset_in_bytes);
long index = 0, i = 0;
for (;;) {
if (U16_IS_LEAD(self->data.uchars[i]) && (i+1 < length)
&& U16_IS_TRAIL(self->data.uchars[i+1])) {
i += 2;
}
else {
++i;
}
if (offset_in_uchars < i) {
return index;
}
++index;
if (offset_in_uchars == i) {
return index;
}
}
}
}
else {
if (self->encoding->single_byte_encoding) {
return offset_in_bytes;
}
else if (UTF32_ENC(self->encoding)
&& (!ucs2_mode