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string.c
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/**********************************************************************
string.c -
$Author$
created at: Mon Aug 9 17:12:58 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "ruby/encoding.h"
#include "ruby/re.h"
#include "internal.h"
#include "encindex.h"
#include "probes.h"
#include "gc.h"
#include "ruby_assert.h"
#include "id.h"
#include "debug_counter.h"
#include "ruby/util.h"
#define BEG(no) (regs->beg[(no)])
#define END(no) (regs->end[(no)])
#include <errno.h>
#include <math.h>
#include <ctype.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined HAVE_CRYPT_R
# if defined HAVE_CRYPT_H
# include <crypt.h>
# endif
#elif !defined HAVE_CRYPT
# include "missing/crypt.h"
# define HAVE_CRYPT_R 1
#endif
#undef rb_str_new
#undef rb_usascii_str_new
#undef rb_utf8_str_new
#undef rb_enc_str_new
#undef rb_str_new_cstr
#undef rb_tainted_str_new_cstr
#undef rb_usascii_str_new_cstr
#undef rb_utf8_str_new_cstr
#undef rb_enc_str_new_cstr
#undef rb_external_str_new_cstr
#undef rb_locale_str_new_cstr
#undef rb_str_dup_frozen
#undef rb_str_buf_new_cstr
#undef rb_str_buf_cat
#undef rb_str_buf_cat2
#undef rb_str_cat2
#undef rb_str_cat_cstr
#undef rb_fstring_cstr
static VALUE rb_str_clear(VALUE str);
VALUE rb_cString;
VALUE rb_cSymbol;
/* FLAGS of RString
*
* 1: RSTRING_NOEMBED
* 2: STR_SHARED (== ELTS_SHARED)
* 2-6: RSTRING_EMBED_LEN (5 bits == 32)
* 5: STR_SHARED_ROOT (RSTRING_NOEMBED==1 && STR_SHARED == 0, there may be
* other strings that rely on this string's buffer)
* 6: STR_BORROWED (when RSTRING_NOEMBED==1 && klass==0, unsafe to recycle
* early, specific to rb_str_tmp_frozen_{acquire,release})
* 7: STR_TMPLOCK
* 8-9: ENC_CODERANGE (2 bits)
* 10-16: ENCODING (7 bits == 128)
* 17: RSTRING_FSTR
* 18: STR_NOFREE
* 19: STR_FAKESTR
*/
#define RUBY_MAX_CHAR_LEN 16
#define STR_SHARED_ROOT FL_USER5
#define STR_BORROWED FL_USER6
#define STR_TMPLOCK FL_USER7
#define STR_NOFREE FL_USER18
#define STR_FAKESTR FL_USER19
#define STR_SET_NOEMBED(str) do {\
FL_SET((str), STR_NOEMBED);\
STR_SET_EMBED_LEN((str), 0);\
} while (0)
#define STR_SET_EMBED(str) FL_UNSET((str), (STR_NOEMBED|STR_NOFREE))
#define STR_SET_EMBED_LEN(str, n) do { \
long tmp_n = (n);\
RBASIC(str)->flags &= ~RSTRING_EMBED_LEN_MASK;\
RBASIC(str)->flags |= (tmp_n) << RSTRING_EMBED_LEN_SHIFT;\
} while (0)
#define STR_SET_LEN(str, n) do { \
if (STR_EMBED_P(str)) {\
STR_SET_EMBED_LEN((str), (n));\
}\
else {\
RSTRING(str)->as.heap.len = (n);\
}\
} while (0)
#define STR_DEC_LEN(str) do {\
if (STR_EMBED_P(str)) {\
long n = RSTRING_LEN(str);\
n--;\
STR_SET_EMBED_LEN((str), n);\
}\
else {\
RSTRING(str)->as.heap.len--;\
}\
} while (0)
#define TERM_LEN(str) rb_enc_mbminlen(rb_enc_get(str))
#define TERM_FILL(ptr, termlen) do {\
char *const term_fill_ptr = (ptr);\
const int term_fill_len = (termlen);\
*term_fill_ptr = '\0';\
if (UNLIKELY(term_fill_len > 1))\
memset(term_fill_ptr, 0, term_fill_len);\
} while (0)
#define RESIZE_CAPA(str,capacity) do {\
const int termlen = TERM_LEN(str);\
RESIZE_CAPA_TERM(str,capacity,termlen);\
} while (0)
#define RESIZE_CAPA_TERM(str,capacity,termlen) do {\
if (STR_EMBED_P(str)) {\
if (!STR_EMBEDDABLE_P(capacity, termlen)) {\
char *const tmp = ALLOC_N(char, (size_t)(capacity) + (termlen));\
const long tlen = RSTRING_LEN(str);\
memcpy(tmp, RSTRING_PTR(str), tlen);\
RSTRING(str)->as.heap.ptr = tmp;\
RSTRING(str)->as.heap.len = tlen;\
STR_SET_NOEMBED(str);\
RSTRING(str)->as.heap.aux.capa = (capacity);\
}\
}\
else {\
assert(!FL_TEST((str), STR_SHARED)); \
SIZED_REALLOC_N(RSTRING(str)->as.heap.ptr, char, \
(size_t)(capacity) + (termlen), STR_HEAP_SIZE(str)); \
RSTRING(str)->as.heap.aux.capa = (capacity);\
}\
} while (0)
#define STR_SET_SHARED(str, shared_str) do { \
if (!FL_TEST(str, STR_FAKESTR)) { \
RB_OBJ_WRITE((str), &RSTRING(str)->as.heap.aux.shared, (shared_str)); \
FL_SET((str), STR_SHARED); \
FL_SET((shared_str), STR_SHARED_ROOT); \
if (RBASIC_CLASS((shared_str)) == 0) /* for CoW-friendliness */ \
FL_SET_RAW((shared_str), STR_BORROWED); \
} \
} while (0)
#define STR_HEAP_PTR(str) (RSTRING(str)->as.heap.ptr)
#define STR_HEAP_SIZE(str) ((size_t)RSTRING(str)->as.heap.aux.capa + TERM_LEN(str))
#define STR_ENC_GET(str) get_encoding(str)
#if !defined SHARABLE_MIDDLE_SUBSTRING
# define SHARABLE_MIDDLE_SUBSTRING 0
#endif
#if !SHARABLE_MIDDLE_SUBSTRING
#define SHARABLE_SUBSTRING_P(beg, len, end) ((beg) + (len) == (end))
#else
#define SHARABLE_SUBSTRING_P(beg, len, end) 1
#endif
#define STR_EMBEDDABLE_P(len, termlen) \
((len) <= RSTRING_EMBED_LEN_MAX + 1 - (termlen))
static VALUE str_replace_shared_without_enc(VALUE str2, VALUE str);
static VALUE str_new_shared(VALUE klass, VALUE str);
static VALUE str_new_frozen(VALUE klass, VALUE orig);
static VALUE str_new_static(VALUE klass, const char *ptr, long len, int encindex);
static void str_make_independent_expand(VALUE str, long len, long expand, const int termlen);
static inline void str_modifiable(VALUE str);
static VALUE rb_str_downcase(int argc, VALUE *argv, VALUE str);
static inline void
str_make_independent(VALUE str)
{
long len = RSTRING_LEN(str);
int termlen = TERM_LEN(str);
str_make_independent_expand((str), len, 0L, termlen);
}
/* symbols for [up|down|swap]case/capitalize options */
static VALUE sym_ascii, sym_turkic, sym_lithuanian, sym_fold;
static rb_encoding *
get_actual_encoding(const int encidx, VALUE str)
{
const unsigned char *q;
switch (encidx) {
case ENCINDEX_UTF_16:
if (RSTRING_LEN(str) < 2) break;
q = (const unsigned char *)RSTRING_PTR(str);
if (q[0] == 0xFE && q[1] == 0xFF) {
return rb_enc_get_from_index(ENCINDEX_UTF_16BE);
}
if (q[0] == 0xFF && q[1] == 0xFE) {
return rb_enc_get_from_index(ENCINDEX_UTF_16LE);
}
return rb_ascii8bit_encoding();
case ENCINDEX_UTF_32:
if (RSTRING_LEN(str) < 4) break;
q = (const unsigned char *)RSTRING_PTR(str);
if (q[0] == 0 && q[1] == 0 && q[2] == 0xFE && q[3] == 0xFF) {
return rb_enc_get_from_index(ENCINDEX_UTF_32BE);
}
if (q[3] == 0 && q[2] == 0 && q[1] == 0xFE && q[0] == 0xFF) {
return rb_enc_get_from_index(ENCINDEX_UTF_32LE);
}
return rb_ascii8bit_encoding();
}
return rb_enc_from_index(encidx);
}
static rb_encoding *
get_encoding(VALUE str)
{
return get_actual_encoding(ENCODING_GET(str), str);
}
static void
mustnot_broken(VALUE str)
{
if (is_broken_string(str)) {
rb_raise(rb_eArgError, "invalid byte sequence in %s", rb_enc_name(STR_ENC_GET(str)));
}
}
static void
mustnot_wchar(VALUE str)
{
rb_encoding *enc = STR_ENC_GET(str);
if (rb_enc_mbminlen(enc) > 1) {
rb_raise(rb_eArgError, "wide char encoding: %s", rb_enc_name(enc));
}
}
static int fstring_cmp(VALUE a, VALUE b);
static VALUE register_fstring(VALUE str);
const struct st_hash_type rb_fstring_hash_type = {
fstring_cmp,
rb_str_hash,
};
#define BARE_STRING_P(str) (!FL_ANY_RAW(str, FL_EXIVAR) && RBASIC_CLASS(str) == rb_cString)
static int
fstr_update_callback(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
{
VALUE *fstr = (VALUE *)arg;
VALUE str = (VALUE)*key;
if (existing) {
/* because of lazy sweep, str may be unmarked already and swept
* at next time */
if (rb_objspace_garbage_object_p(str)) {
*fstr = Qundef;
return ST_DELETE;
}
*fstr = str;
return ST_STOP;
}
else {
if (FL_TEST_RAW(str, STR_FAKESTR)) {
str = str_new_static(rb_cString, RSTRING(str)->as.heap.ptr,
RSTRING(str)->as.heap.len,
ENCODING_GET(str));
OBJ_FREEZE_RAW(str);
}
else {
str = str_new_frozen(rb_cString, str);
if (STR_SHARED_P(str)) { /* str should not be shared */
/* shared substring */
str_make_independent(str);
assert(OBJ_FROZEN(str));
}
if (!BARE_STRING_P(str)) {
str = str_new_frozen(rb_cString, str);
}
}
RBASIC(str)->flags |= RSTRING_FSTR;
*key = *value = *fstr = str;
return ST_CONTINUE;
}
}
RUBY_FUNC_EXPORTED
VALUE
rb_fstring(VALUE str)
{
VALUE fstr;
int bare;
Check_Type(str, T_STRING);
if (FL_TEST(str, RSTRING_FSTR))
return str;
bare = BARE_STRING_P(str);
if (!bare) {
if (STR_EMBED_P(str)) {
OBJ_FREEZE_RAW(str);
return str;
}
if (FL_TEST_RAW(str, STR_NOEMBED|STR_SHARED_ROOT|STR_SHARED) == (STR_NOEMBED|STR_SHARED_ROOT)) {
assert(OBJ_FROZEN(str));
return str;
}
}
if (!OBJ_FROZEN(str))
rb_str_resize(str, RSTRING_LEN(str));
fstr = register_fstring(str);
if (!bare) {
str_replace_shared_without_enc(str, fstr);
OBJ_FREEZE_RAW(str);
return str;
}
return fstr;
}
static VALUE
register_fstring(VALUE str)
{
VALUE ret;
st_table *frozen_strings = rb_vm_fstring_table();
do {
ret = str;
st_update(frozen_strings, (st_data_t)str,
fstr_update_callback, (st_data_t)&ret);
} while (ret == Qundef);
assert(OBJ_FROZEN(ret));
assert(!FL_TEST_RAW(ret, STR_FAKESTR));
assert(!FL_TEST_RAW(ret, FL_EXIVAR));
assert(RBASIC_CLASS(ret) == rb_cString);
return ret;
}
static VALUE
setup_fake_str(struct RString *fake_str, const char *name, long len, int encidx)
{
fake_str->basic.flags = T_STRING|RSTRING_NOEMBED|STR_NOFREE|STR_FAKESTR;
/* SHARED to be allocated by the callback */
ENCODING_SET_INLINED((VALUE)fake_str, encidx);
RBASIC_SET_CLASS_RAW((VALUE)fake_str, rb_cString);
fake_str->as.heap.len = len;
fake_str->as.heap.ptr = (char *)name;
fake_str->as.heap.aux.capa = len;
return (VALUE)fake_str;
}
/*
* set up a fake string which refers a static string literal.
*/
VALUE
rb_setup_fake_str(struct RString *fake_str, const char *name, long len, rb_encoding *enc)
{
return setup_fake_str(fake_str, name, len, rb_enc_to_index(enc));
}
/*
* rb_fstring_new and rb_fstring_cstr family create or lookup a frozen
* shared string which refers a static string literal. `ptr` must
* point a constant string.
*/
MJIT_FUNC_EXPORTED VALUE
rb_fstring_new(const char *ptr, long len)
{
struct RString fake_str;
return register_fstring(setup_fake_str(&fake_str, ptr, len, ENCINDEX_US_ASCII));
}
VALUE
rb_fstring_enc_new(const char *ptr, long len, rb_encoding *enc)
{
struct RString fake_str;
return register_fstring(rb_setup_fake_str(&fake_str, ptr, len, enc));
}
VALUE
rb_fstring_cstr(const char *ptr)
{
return rb_fstring_new(ptr, strlen(ptr));
}
static int
fstring_set_class_i(st_data_t key, st_data_t val, st_data_t arg)
{
RBASIC_SET_CLASS((VALUE)key, (VALUE)arg);
return ST_CONTINUE;
}
static int
fstring_cmp(VALUE a, VALUE b)
{
long alen, blen;
const char *aptr, *bptr;
RSTRING_GETMEM(a, aptr, alen);
RSTRING_GETMEM(b, bptr, blen);
return (alen != blen ||
ENCODING_GET(a) != ENCODING_GET(b) ||
memcmp(aptr, bptr, alen) != 0);
}
static inline int
single_byte_optimizable(VALUE str)
{
rb_encoding *enc;
/* Conservative. It may be ENC_CODERANGE_UNKNOWN. */
if (ENC_CODERANGE(str) == ENC_CODERANGE_7BIT)
return 1;
enc = STR_ENC_GET(str);
if (rb_enc_mbmaxlen(enc) == 1)
return 1;
/* Conservative. Possibly single byte.
* "\xa1" in Shift_JIS for example. */
return 0;
}
VALUE rb_fs;
static inline const char *
search_nonascii(const char *p, const char *e)
{
const uintptr_t *s, *t;
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
# if SIZEOF_UINTPTR_T == 8
# define NONASCII_MASK UINT64_C(0x8080808080808080)
# elif SIZEOF_UINTPTR_T == 4
# define NONASCII_MASK UINT32_C(0x80808080)
# else
# error "don't know what to do."
# endif
#else
# if SIZEOF_UINTPTR_T == 8
# define NONASCII_MASK ((uintptr_t)0x80808080UL << 32 | (uintptr_t)0x80808080UL)
# elif SIZEOF_UINTPTR_T == 4
# define NONASCII_MASK 0x80808080UL /* or...? */
# else
# error "don't know what to do."
# endif
#endif
if (UNALIGNED_WORD_ACCESS || e - p >= SIZEOF_VOIDP) {
#if !UNALIGNED_WORD_ACCESS
if ((uintptr_t)p % SIZEOF_VOIDP) {
int l = SIZEOF_VOIDP - (uintptr_t)p % SIZEOF_VOIDP;
p += l;
switch (l) {
default: UNREACHABLE;
#if SIZEOF_VOIDP > 4
case 7: if (p[-7]&0x80) return p-7;
case 6: if (p[-6]&0x80) return p-6;
case 5: if (p[-5]&0x80) return p-5;
case 4: if (p[-4]&0x80) return p-4;
#endif
case 3: if (p[-3]&0x80) return p-3;
case 2: if (p[-2]&0x80) return p-2;
case 1: if (p[-1]&0x80) return p-1;
case 0: break;
}
}
#endif
#if defined(HAVE_BUILTIN___BUILTIN_ASSUME_ALIGNED) &&! UNALIGNED_WORD_ACCESS
#define aligned_ptr(value) \
__builtin_assume_aligned((value), sizeof(uintptr_t))
#else
#define aligned_ptr(value) (uintptr_t *)(value)
#endif
s = aligned_ptr(p);
t = (uintptr_t *)(e - (SIZEOF_VOIDP-1));
#undef aligned_ptr
for (;s < t; s++) {
if (*s & NONASCII_MASK) {
#ifdef WORDS_BIGENDIAN
return (const char *)s + (nlz_intptr(*s&NONASCII_MASK)>>3);
#else
return (const char *)s + (ntz_intptr(*s&NONASCII_MASK)>>3);
#endif
}
}
p = (const char *)s;
}
switch (e - p) {
default: UNREACHABLE;
#if SIZEOF_VOIDP > 4
case 7: if (e[-7]&0x80) return e-7;
case 6: if (e[-6]&0x80) return e-6;
case 5: if (e[-5]&0x80) return e-5;
case 4: if (e[-4]&0x80) return e-4;
#endif
case 3: if (e[-3]&0x80) return e-3;
case 2: if (e[-2]&0x80) return e-2;
case 1: if (e[-1]&0x80) return e-1;
case 0: return NULL;
}
}
static int
coderange_scan(const char *p, long len, rb_encoding *enc)
{
const char *e = p + len;
if (rb_enc_to_index(enc) == rb_ascii8bit_encindex()) {
/* enc is ASCII-8BIT. ASCII-8BIT string never be broken. */
p = search_nonascii(p, e);
return p ? ENC_CODERANGE_VALID : ENC_CODERANGE_7BIT;
}
if (rb_enc_asciicompat(enc)) {
p = search_nonascii(p, e);
if (!p) return ENC_CODERANGE_7BIT;
for (;;) {
int ret = rb_enc_precise_mbclen(p, e, enc);
if (!MBCLEN_CHARFOUND_P(ret)) return ENC_CODERANGE_BROKEN;
p += MBCLEN_CHARFOUND_LEN(ret);
if (p == e) break;
p = search_nonascii(p, e);
if (!p) break;
}
}
else {
while (p < e) {
int ret = rb_enc_precise_mbclen(p, e, enc);
if (!MBCLEN_CHARFOUND_P(ret)) return ENC_CODERANGE_BROKEN;
p += MBCLEN_CHARFOUND_LEN(ret);
}
}
return ENC_CODERANGE_VALID;
}
long
rb_str_coderange_scan_restartable(const char *s, const char *e, rb_encoding *enc, int *cr)
{
const char *p = s;
if (*cr == ENC_CODERANGE_BROKEN)
return e - s;
if (rb_enc_to_index(enc) == rb_ascii8bit_encindex()) {
/* enc is ASCII-8BIT. ASCII-8BIT string never be broken. */
if (*cr == ENC_CODERANGE_VALID) return e - s;
p = search_nonascii(p, e);
*cr = p ? ENC_CODERANGE_VALID : ENC_CODERANGE_7BIT;
return e - s;
}
else if (rb_enc_asciicompat(enc)) {
p = search_nonascii(p, e);
if (!p) {
if (*cr != ENC_CODERANGE_VALID) *cr = ENC_CODERANGE_7BIT;
return e - s;
}
for (;;) {
int ret = rb_enc_precise_mbclen(p, e, enc);
if (!MBCLEN_CHARFOUND_P(ret)) {
*cr = MBCLEN_INVALID_P(ret) ? ENC_CODERANGE_BROKEN: ENC_CODERANGE_UNKNOWN;
return p - s;
}
p += MBCLEN_CHARFOUND_LEN(ret);
if (p == e) break;
p = search_nonascii(p, e);
if (!p) break;
}
}
else {
while (p < e) {
int ret = rb_enc_precise_mbclen(p, e, enc);
if (!MBCLEN_CHARFOUND_P(ret)) {
*cr = MBCLEN_INVALID_P(ret) ? ENC_CODERANGE_BROKEN: ENC_CODERANGE_UNKNOWN;
return p - s;
}
p += MBCLEN_CHARFOUND_LEN(ret);
}
}
*cr = ENC_CODERANGE_VALID;
return e - s;
}
static inline void
str_enc_copy(VALUE str1, VALUE str2)
{
rb_enc_set_index(str1, ENCODING_GET(str2));
}
static void
rb_enc_cr_str_copy_for_substr(VALUE dest, VALUE src)
{
/* this function is designed for copying encoding and coderange
* from src to new string "dest" which is made from the part of src.
*/
str_enc_copy(dest, src);
if (RSTRING_LEN(dest) == 0) {
if (!rb_enc_asciicompat(STR_ENC_GET(src)))
ENC_CODERANGE_SET(dest, ENC_CODERANGE_VALID);
else
ENC_CODERANGE_SET(dest, ENC_CODERANGE_7BIT);
return;
}
switch (ENC_CODERANGE(src)) {
case ENC_CODERANGE_7BIT:
ENC_CODERANGE_SET(dest, ENC_CODERANGE_7BIT);
break;
case ENC_CODERANGE_VALID:
if (!rb_enc_asciicompat(STR_ENC_GET(src)) ||
search_nonascii(RSTRING_PTR(dest), RSTRING_END(dest)))
ENC_CODERANGE_SET(dest, ENC_CODERANGE_VALID);
else
ENC_CODERANGE_SET(dest, ENC_CODERANGE_7BIT);
break;
default:
break;
}
}
static void
rb_enc_cr_str_exact_copy(VALUE dest, VALUE src)
{
str_enc_copy(dest, src);
ENC_CODERANGE_SET(dest, ENC_CODERANGE(src));
}
int
rb_enc_str_coderange(VALUE str)
{
int cr = ENC_CODERANGE(str);
if (cr == ENC_CODERANGE_UNKNOWN) {
int encidx = ENCODING_GET(str);
rb_encoding *enc = rb_enc_from_index(encidx);
if (rb_enc_mbminlen(enc) > 1 && rb_enc_dummy_p(enc) &&
rb_enc_mbminlen(enc = get_actual_encoding(encidx, str)) == 1) {
cr = ENC_CODERANGE_BROKEN;
}
else {
cr = coderange_scan(RSTRING_PTR(str), RSTRING_LEN(str),
enc);
}
ENC_CODERANGE_SET(str, cr);
}
return cr;
}
int
rb_enc_str_asciionly_p(VALUE str)
{
rb_encoding *enc = STR_ENC_GET(str);
if (!rb_enc_asciicompat(enc))
return FALSE;
else if (rb_enc_str_coderange(str) == ENC_CODERANGE_7BIT)
return TRUE;
return FALSE;
}
static inline void
str_mod_check(VALUE s, const char *p, long len)
{
if (RSTRING_PTR(s) != p || RSTRING_LEN(s) != len){
rb_raise(rb_eRuntimeError, "string modified");
}
}
static size_t
str_capacity(VALUE str, const int termlen)
{
if (STR_EMBED_P(str)) {
return (RSTRING_EMBED_LEN_MAX + 1 - termlen);
}
else if (FL_TEST(str, STR_SHARED|STR_NOFREE)) {
return RSTRING(str)->as.heap.len;
}
else {
return RSTRING(str)->as.heap.aux.capa;
}
}
size_t
rb_str_capacity(VALUE str)
{
return str_capacity(str, TERM_LEN(str));
}
static inline void
must_not_null(const char *ptr)
{
if (!ptr) {
rb_raise(rb_eArgError, "NULL pointer given");
}
}
static inline VALUE
str_alloc(VALUE klass)
{
NEWOBJ_OF(str, struct RString, klass, T_STRING | (RGENGC_WB_PROTECTED_STRING ? FL_WB_PROTECTED : 0));
return (VALUE)str;
}
static inline VALUE
empty_str_alloc(VALUE klass)
{
RUBY_DTRACE_CREATE_HOOK(STRING, 0);
return str_alloc(klass);
}
static VALUE
str_new0(VALUE klass, const char *ptr, long len, int termlen)
{
VALUE str;
if (len < 0) {
rb_raise(rb_eArgError, "negative string size (or size too big)");
}
RUBY_DTRACE_CREATE_HOOK(STRING, len);
str = str_alloc(klass);
if (!STR_EMBEDDABLE_P(len, termlen)) {
RSTRING(str)->as.heap.aux.capa = len;
RSTRING(str)->as.heap.ptr = ALLOC_N(char, (size_t)len + termlen);
STR_SET_NOEMBED(str);
}
else if (len == 0) {
ENC_CODERANGE_SET(str, ENC_CODERANGE_7BIT);
}
if (ptr) {
memcpy(RSTRING_PTR(str), ptr, len);
}
STR_SET_LEN(str, len);
TERM_FILL(RSTRING_PTR(str) + len, termlen);
return str;
}
static VALUE
str_new(VALUE klass, const char *ptr, long len)
{
return str_new0(klass, ptr, len, 1);
}
VALUE
rb_str_new(const char *ptr, long len)
{
return str_new(rb_cString, ptr, len);
}
VALUE
rb_usascii_str_new(const char *ptr, long len)
{
VALUE str = rb_str_new(ptr, len);
ENCODING_CODERANGE_SET(str, rb_usascii_encindex(), ENC_CODERANGE_7BIT);
return str;
}
VALUE
rb_utf8_str_new(const char *ptr, long len)
{
VALUE str = str_new(rb_cString, ptr, len);
rb_enc_associate_index(str, rb_utf8_encindex());
return str;
}
VALUE
rb_enc_str_new(const char *ptr, long len, rb_encoding *enc)
{
VALUE str;
if (!enc) return rb_str_new(ptr, len);
str = str_new0(rb_cString, ptr, len, rb_enc_mbminlen(enc));
rb_enc_associate(str, enc);
return str;
}
VALUE
rb_str_new_cstr(const char *ptr)
{
must_not_null(ptr);
/* rb_str_new_cstr() can take pointer from non-malloc-generated
* memory regions, and that cannot be detected by the MSAN. Just
* trust the programmer that the argument passed here is a sane C
* string. */
__msan_unpoison_string(ptr);
return rb_str_new(ptr, strlen(ptr));
}
VALUE
rb_usascii_str_new_cstr(const char *ptr)
{
VALUE str = rb_str_new_cstr(ptr);
ENCODING_CODERANGE_SET(str, rb_usascii_encindex(), ENC_CODERANGE_7BIT);
return str;
}
VALUE
rb_utf8_str_new_cstr(const char *ptr)
{
VALUE str = rb_str_new_cstr(ptr);
rb_enc_associate_index(str, rb_utf8_encindex());
return str;
}
VALUE
rb_enc_str_new_cstr(const char *ptr, rb_encoding *enc)
{
must_not_null(ptr);
if (rb_enc_mbminlen(enc) != 1) {
rb_raise(rb_eArgError, "wchar encoding given");
}
return rb_enc_str_new(ptr, strlen(ptr), enc);
}
static VALUE
str_new_static(VALUE klass, const char *ptr, long len, int encindex)
{
VALUE str;
if (len < 0) {
rb_raise(rb_eArgError, "negative string size (or size too big)");
}
if (!ptr) {
rb_encoding *enc = rb_enc_get_from_index(encindex);
str = str_new0(klass, ptr, len, rb_enc_mbminlen(enc));
}
else {
RUBY_DTRACE_CREATE_HOOK(STRING, len);
str = str_alloc(klass);
RSTRING(str)->as.heap.len = len;
RSTRING(str)->as.heap.ptr = (char *)ptr;
RSTRING(str)->as.heap.aux.capa = len;
STR_SET_NOEMBED(str);
RBASIC(str)->flags |= STR_NOFREE;
}
rb_enc_associate_index(str, encindex);
return str;
}
VALUE
rb_str_new_static(const char *ptr, long len)
{
return str_new_static(rb_cString, ptr, len, 0);
}
VALUE
rb_usascii_str_new_static(const char *ptr, long len)
{
return str_new_static(rb_cString, ptr, len, ENCINDEX_US_ASCII);
}
VALUE
rb_utf8_str_new_static(const char *ptr, long len)
{
return str_new_static(rb_cString, ptr, len, ENCINDEX_UTF_8);
}
VALUE
rb_enc_str_new_static(const char *ptr, long len, rb_encoding *enc)
{
return str_new_static(rb_cString, ptr, len, rb_enc_to_index(enc));
}
VALUE
rb_tainted_str_new(const char *ptr, long len)
{
rb_warning("rb_tainted_str_new is deprecated and will be removed in Ruby 3.2.");
return rb_str_new(ptr, len);
}
VALUE
rb_tainted_str_new_cstr(const char *ptr)
{
rb_warning("rb_tainted_str_new_cstr is deprecated and will be removed in Ruby 3.2.");
return rb_str_new_cstr(ptr);
}
static VALUE str_cat_conv_enc_opts(VALUE newstr, long ofs, const char *ptr, long len,
rb_encoding *from, rb_encoding *to,
int ecflags, VALUE ecopts);
VALUE
rb_str_conv_enc_opts(VALUE str, rb_encoding *from, rb_encoding *to, int ecflags, VALUE ecopts)
{
long len;
const char *ptr;
VALUE newstr;
if (!to) return str;
if (!from) from = rb_enc_get(str);
if (from == to) return str;
if ((rb_enc_asciicompat(to) && is_ascii_string(str)) ||
to == rb_ascii8bit_encoding()) {
if (STR_ENC_GET(str) != to) {
str = rb_str_dup(str);
rb_enc_associate(str, to);
}
return str;
}
RSTRING_GETMEM(str, ptr, len);
newstr = str_cat_conv_enc_opts(rb_str_buf_new(len), 0, ptr, len,
from, to, ecflags, ecopts);
if (NIL_P(newstr)) {
/* some error, return original */
return str;
}
return newstr;
}
VALUE
rb_str_cat_conv_enc_opts(VALUE newstr, long ofs, const char *ptr, long len,
rb_encoding *from, int ecflags, VALUE ecopts)
{
long olen;
olen = RSTRING_LEN(newstr);
if (ofs < -olen || olen < ofs)
rb_raise(rb_eIndexError, "index %ld out of string", ofs);
if (ofs < 0) ofs += olen;
if (!from) {
STR_SET_LEN(newstr, ofs);
return rb_str_cat(newstr, ptr, len);
}
rb_str_modify(newstr);
return str_cat_conv_enc_opts(newstr, ofs, ptr, len, from,
rb_enc_get(newstr),
ecflags, ecopts);
}
VALUE
rb_str_initialize(VALUE str, const char *ptr, long len, rb_encoding *enc)
{
STR_SET_LEN(str, 0);
rb_enc_associate(str, enc);
rb_str_cat(str, ptr, len);
return str;
}
static VALUE
str_cat_conv_enc_opts(VALUE newstr, long ofs, const char *ptr, long len,
rb_encoding *from, rb_encoding *to,
int ecflags, VALUE ecopts)
{
rb_econv_t *ec;
rb_econv_result_t ret;
long olen;
VALUE econv_wrapper;
const unsigned char *start, *sp;
unsigned char *dest, *dp;
size_t converted_output = (size_t)ofs;
olen = rb_str_capacity(newstr);
econv_wrapper = rb_obj_alloc(rb_cEncodingConverter);
RBASIC_CLEAR_CLASS(econv_wrapper);
ec = rb_econv_open_opts(from->name, to->name, ecflags, ecopts);
if (!ec) return Qnil;
DATA_PTR(econv_wrapper) = ec;
sp = (unsigned char*)ptr;
start = sp;
while ((dest = (unsigned char*)RSTRING_PTR(newstr)),
(dp = dest + converted_output),
(ret = rb_econv_convert(ec, &sp, start + len, &dp, dest + olen, 0)),
ret == econv_destination_buffer_full) {
/* destination buffer short */
size_t converted_input = sp - start;