/* Convert multibyte character to wide character.
- Copyright (C) 1999-2002, 2005-2019 Free Software Foundation, Inc.
+ Copyright (C) 1999-2002, 2005-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2008.
This program is free software: you can redistribute it and/or modify
/* Specification. */
#include <wchar.h>
-#if C_LOCALE_MAYBE_EILSEQ
-# include "hard-locale.h"
-# include <locale.h>
-#endif
-
#if GNULIB_defined_mbstate_t
-/* Implement mbrtowc() on top of mbtowc(). */
+/* Implement mbrtowc() on top of mbtowc() for the non-UTF-8 locales
+ and directly for the UTF-8 locales. */
# include <errno.h>
+# include <stdint.h>
# include <stdlib.h>
-# include "localcharset.h"
-# include "streq.h"
+# if defined _WIN32 && !defined __CYGWIN__
+
+# define WIN32_LEAN_AND_MEAN /* avoid including junk */
+# include <windows.h>
+
+# elif HAVE_PTHREAD_API
+
+# include <pthread.h>
+# if HAVE_THREADS_H && HAVE_WEAK_SYMBOLS
+# include <threads.h>
+# pragma weak thrd_exit
+# define c11_threads_in_use() (thrd_exit != NULL)
+# else
+# define c11_threads_in_use() 0
+# endif
+
+# elif HAVE_THREADS_H
+
+# include <threads.h>
+
+# endif
+
# include "verify.h"
-# include "glthread/lock.h"
+# include "lc-charset-dispatch.h"
+# include "mbtowc-lock.h"
# ifndef FALLTHROUGH
# if __GNUC__ < 7
# endif
# endif
-/* Returns a classification of special values of the encoding of the current
- locale. */
-typedef enum {
- enc_other, /* other */
- enc_utf8, /* UTF-8 */
- enc_eucjp, /* EUC-JP */
- enc_94, /* EUC-KR, GB2312, BIG5 */
- enc_euctw, /* EUC-TW */
- enc_gb18030, /* GB18030 */
- enc_sjis /* SJIS */
-} enc_t;
-static inline enc_t
-locale_enc (void)
-{
- const char *encoding = locale_charset ();
- if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
- return enc_utf8;
- if (STREQ_OPT (encoding, "EUC-JP", 'E', 'U', 'C', '-', 'J', 'P', 0, 0, 0))
- return enc_eucjp;
- if (STREQ_OPT (encoding, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
- || STREQ_OPT (encoding, "GB2312", 'G', 'B', '2', '3', '1', '2', 0, 0, 0)
- || STREQ_OPT (encoding, "BIG5", 'B', 'I', 'G', '5', 0, 0, 0, 0, 0))
- return enc_94;
- if (STREQ_OPT (encoding, "EUC-TW", 'E', 'U', 'C', '-', 'T', 'W', 0, 0, 0))
- return enc_euctw;
- if (STREQ_OPT (encoding, "GB18030", 'G', 'B', '1', '8', '0', '3', '0', 0, 0))
- return enc_gb18030;
- if (STREQ_OPT (encoding, "SJIS", 'S', 'J', 'I', 'S', 0, 0, 0, 0, 0))
- return enc_sjis;
- return enc_other;
-}
-
-# if GNULIB_WCHAR_SINGLE
-/* When we know that the locale does not change, provide a speedup by
- caching the value of locale_enc. */
-static int cached_locale_enc = -1;
-static inline enc_t
-locale_enc_cached (void)
-{
- if (cached_locale_enc < 0)
- cached_locale_enc = locale_enc ();
- return cached_locale_enc;
-}
-# else
-/* By default, don't make assumptions, hence no caching. */
-# define locale_enc_cached locale_enc
-# endif
-
-/* This lock protects the internal state of mbtowc against multiple simultaneous
- calls of mbrtowc. */
-gl_lock_define_initialized(static, mbtowc_lock)
-
verify (sizeof (mbstate_t) >= 4);
-
static char internal_state[4];
size_t
mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps)
{
- char *pstate = (char *)ps;
-
- if (s == NULL)
- {
- pwc = NULL;
- s = "";
- n = 1;
- }
-
- if (n == 0)
- return (size_t)(-2);
-
- /* Here n > 0. */
-
- if (pstate == NULL)
- pstate = internal_state;
-
- {
- size_t nstate = pstate[0];
- char buf[4];
- const char *p;
- size_t m;
- enc_t enc;
- int res;
-
- switch (nstate)
- {
- case 0:
- p = s;
- m = n;
- break;
- case 3:
- buf[2] = pstate[3];
- FALLTHROUGH;
- case 2:
- buf[1] = pstate[2];
- FALLTHROUGH;
- case 1:
- buf[0] = pstate[1];
- p = buf;
- m = nstate;
- buf[m++] = s[0];
- if (n >= 2 && m < 4)
- {
- buf[m++] = s[1];
- if (n >= 3 && m < 4)
- buf[m++] = s[2];
- }
- break;
- default:
- errno = EINVAL;
- return (size_t)(-1);
- }
-
- /* Here m > 0. */
-
- enc = locale_enc_cached ();
-
- if (enc == enc_utf8) /* UTF-8 */
- {
- /* Achieve multi-thread safety by not calling mbtowc() at all. */
- /* Cf. unistr/u8-mbtouc.c. */
- unsigned char c = (unsigned char) p[0];
-
- if (c < 0x80)
- {
- if (pwc != NULL)
- *pwc = c;
- res = (c == 0 ? 0 : 1);
- goto success;
- }
- if (c >= 0xc2)
- {
- if (c < 0xe0)
- {
- if (m == 1)
- goto incomplete;
- else /* m >= 2 */
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if ((c2 ^ 0x80) < 0x40)
- {
- if (pwc != NULL)
- *pwc = ((unsigned int) (c & 0x1f) << 6)
- | (unsigned int) (c2 ^ 0x80);
- res = 2;
- goto success;
- }
- }
- }
- else if (c < 0xf0)
- {
- if (m == 1)
- goto incomplete;
- else
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if ((c2 ^ 0x80) < 0x40
- && (c >= 0xe1 || c2 >= 0xa0)
- && (c != 0xed || c2 < 0xa0))
- {
- if (m == 2)
- goto incomplete;
- else /* m >= 3 */
- {
- unsigned char c3 = (unsigned char) p[2];
-
- if ((c3 ^ 0x80) < 0x40)
- {
- if (pwc != NULL)
- *pwc = ((unsigned int) (c & 0x0f) << 12)
- | ((unsigned int) (c2 ^ 0x80) << 6)
- | (unsigned int) (c3 ^ 0x80);
- res = 3;
- goto success;
- }
- }
- }
- }
- }
- else if (c <= 0xf4)
- {
- if (m == 1)
- goto incomplete;
- else
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if ((c2 ^ 0x80) < 0x40
- && (c >= 0xf1 || c2 >= 0x90)
- && (c < 0xf4 || (c == 0xf4 && c2 < 0x90)))
- {
- if (m == 2)
- goto incomplete;
- else
- {
- unsigned char c3 = (unsigned char) p[2];
-
- if ((c3 ^ 0x80) < 0x40)
- {
- if (m == 3)
- goto incomplete;
- else /* m >= 4 */
- {
- unsigned char c4 = (unsigned char) p[3];
-
- if ((c4 ^ 0x80) < 0x40)
- {
- if (pwc != NULL)
- *pwc = ((unsigned int) (c & 0x07) << 18)
- | ((unsigned int) (c2 ^ 0x80) << 12)
- | ((unsigned int) (c3 ^ 0x80) << 6)
- | (unsigned int) (c4 ^ 0x80);
- res = 4;
- goto success;
- }
- }
- }
- }
- }
- }
- }
- }
- goto invalid;
- }
- else
- {
- /* The hidden internal state of mbtowc would make this function not
- multi-thread safe. Achieve multi-thread safety through a lock. */
- gl_lock_lock (mbtowc_lock);
-
- /* Put the hidden internal state of mbtowc into its initial state.
- This is needed at least with glibc, uClibc, and MSVC CRT.
- See <https://sourceware.org/bugzilla/show_bug.cgi?id=9674>. */
- mbtowc (NULL, NULL, 0);
-
- res = mbtowc (pwc, p, m);
-
- gl_lock_unlock (mbtowc_lock);
-
- if (res >= 0)
- {
- if (pwc != NULL && ((*pwc == 0) != (res == 0)))
- abort ();
- goto success;
- }
-
- /* mbtowc does not distinguish between invalid and incomplete multibyte
- sequences. But mbrtowc needs to make this distinction.
- There are two possible approaches:
- - Use iconv() and its return value.
- - Use built-in knowledge about the possible encodings.
- Given the low quality of implementation of iconv() on the systems
- that lack mbrtowc(), we use the second approach.
- The possible encodings are:
- - 8-bit encodings,
- - EUC-JP, EUC-KR, GB2312, EUC-TW, BIG5, GB18030, SJIS,
- - UTF-8 (already handled above).
- Use specialized code for each. */
- if (m >= 4 || m >= MB_CUR_MAX)
- goto invalid;
- /* Here MB_CUR_MAX > 1 and 0 < m < 4. */
- switch (enc)
- {
- /* As a reference for this code, you can use the GNU libiconv
- implementation. Look for uses of the RET_TOOFEW macro. */
-
- case enc_eucjp: /* EUC-JP */
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0xa1 && c < 0xff) || c == 0x8e || c == 0x8f)
- goto incomplete;
- }
- if (m == 2)
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c == 0x8f)
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if (c2 >= 0xa1 && c2 < 0xff)
- goto incomplete;
- }
- }
- goto invalid;
- }
-
- case enc_94: /* EUC-KR, GB2312, BIG5 */
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c >= 0xa1 && c < 0xff)
- goto incomplete;
- }
- goto invalid;
- }
-
- case enc_euctw: /* EUC-TW */
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0xa1 && c < 0xff) || c == 0x8e)
- goto incomplete;
- }
- else /* m == 2 || m == 3 */
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c == 0x8e)
- goto incomplete;
- }
- goto invalid;
- }
-
- case enc_gb18030: /* GB18030 */
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0x90 && c <= 0xe3) || (c >= 0xf8 && c <= 0xfe))
- goto incomplete;
- }
- else /* m == 2 || m == 3 */
- {
- unsigned char c = (unsigned char) p[0];
-
- if (c >= 0x90 && c <= 0xe3)
- {
- unsigned char c2 = (unsigned char) p[1];
-
- if (c2 >= 0x30 && c2 <= 0x39)
- {
- if (m == 2)
- goto incomplete;
- else /* m == 3 */
- {
- unsigned char c3 = (unsigned char) p[2];
-
- if (c3 >= 0x81 && c3 <= 0xfe)
- goto incomplete;
- }
- }
- }
- }
- goto invalid;
- }
-
- case enc_sjis: /* SJIS */
- {
- if (m == 1)
- {
- unsigned char c = (unsigned char) p[0];
-
- if ((c >= 0x81 && c <= 0x9f) || (c >= 0xe0 && c <= 0xea)
- || (c >= 0xf0 && c <= 0xf9))
- goto incomplete;
- }
- goto invalid;
- }
-
- default:
- /* An unknown multibyte encoding. */
- goto incomplete;
- }
- }
-
- success:
- /* res >= 0 is the corrected return value of mbtowc (pwc, p, m). */
- if (nstate >= (res > 0 ? res : 1))
- abort ();
- res -= nstate;
- pstate[0] = 0;
- return res;
-
- incomplete:
- {
- size_t k = nstate;
- /* Here 0 <= k < m < 4. */
- pstate[++k] = s[0];
- if (k < m)
- {
- pstate[++k] = s[1];
- if (k < m)
- pstate[++k] = s[2];
- }
- if (k != m)
- abort ();
- }
- pstate[0] = m;
- return (size_t)(-2);
-
- invalid:
- errno = EILSEQ;
- /* The conversion state is undefined, says POSIX. */
- return (size_t)(-1);
- }
+# define FITS_IN_CHAR_TYPE(wc) ((wc) <= WCHAR_MAX)
+# include "mbrtowc-impl.h"
}
#else
/* Override the system's mbrtowc() function. */
+# if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
+# include "hard-locale.h"
+# include <locale.h>
+# endif
+
# undef mbrtowc
size_t
}
# endif
+# if MBRTOWC_STORES_INCOMPLETE_BUG
+ ret = mbrtowc (&wc, s, n, ps);
+ if (ret < (size_t) -2 && pwc != NULL)
+ *pwc = wc;
+# else
ret = mbrtowc (pwc, s, n, ps);
+# endif
# if MBRTOWC_NUL_RETVAL_BUG
if (ret < (size_t) -2 && !*pwc)
return 0;
# endif
-# if C_LOCALE_MAYBE_EILSEQ
+# if MBRTOWC_IN_C_LOCALE_MAYBE_EILSEQ
if ((size_t) -2 <= ret && n != 0 && ! hard_locale (LC_CTYPE))
{
unsigned char uc = *s;
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