diff options
Diffstat (limited to 'wcsmbs/mbrtowc.c')
| -rw-r--r-- | wcsmbs/mbrtowc.c | 144 |
1 files changed, 54 insertions, 90 deletions
diff --git a/wcsmbs/mbrtowc.c b/wcsmbs/mbrtowc.c index cf0bbd6ce2..99bc5a4797 100644 --- a/wcsmbs/mbrtowc.c +++ b/wcsmbs/mbrtowc.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996. @@ -18,113 +18,77 @@ Boston, MA 02111-1307, USA. */ #include <errno.h> +#include <gconv.h> #include <wchar.h> +#include <wcsmbsload.h> + +#include <assert.h> #ifndef EILSEQ -#define EILSEQ EINVAL +# define EILSEQ EINVAL #endif -static mbstate_t internal; +/* This is the private state used if PS is NULL. */ +static mbstate_t state; size_t __mbrtowc (wchar_t *pwc, const char *s, size_t n, mbstate_t *ps) { - size_t used = 0; - - if (ps == NULL) - ps = &internal; - + wchar_t buf[1]; + struct gconv_step_data data; + size_t inbytes; + int status; + size_t result; + + /* Tell where we want the result. */ + data.outbuf = (char *) (pwc ?: buf); + data.outbufavail = 0; + data.outbufsize = sizeof (wchar_t); + data.is_last = 1; + data.statep = ps ?: &state; + + /* A first special case is if S is NULL. This means put PS in the + initial state. */ if (s == NULL) { - /* See first paragraph of description in 7.16.6.3.2. */ - ps->count = 0; - return 0; + data.outbuf = (char *) buf; + s = ""; + n = 1; } - if (n > 0) - { - if (ps->count == 0) - { - unsigned char byte = (unsigned char) *s++; - ++used; - - /* We must look for a possible first byte of a UTF8 sequence. */ - if (byte < 0x80) - { - /* One byte sequence. */ - if (pwc != NULL) - *pwc = (wchar_t) byte; - return byte ? used : 0; - } - - if ((byte & 0xc0) == 0x80 || (byte & 0xfe) == 0xfe) - { - /* Oh, oh. An encoding error. */ - __set_errno (EILSEQ); - return (size_t) -1; - } - - if ((byte & 0xe0) == 0xc0) - { - /* We expect two bytes. */ - ps->count = 1; - ps->value = byte & 0x1f; - } - else if ((byte & 0xf0) == 0xe0) - { - /* We expect three bytes. */ - ps->count = 2; - ps->value = byte & 0x0f; - } - else if ((byte & 0xf8) == 0xf0) - { - /* We expect four bytes. */ - ps->count = 3; - ps->value = byte & 0x07; - } - else if ((byte & 0xfc) == 0xf8) - { - /* We expect five bytes. */ - ps->count = 4; - ps->value = byte & 0x03; - } - else - { - /* We expect six bytes. */ - ps->count = 5; - ps->value = byte & 0x01; - } - } + /* Make sure we use the correct function. */ + update_conversion_ptrs (); - /* We know we have to handle a multibyte character and there are - some more bytes to read. */ - while (used < n) + /* Do a normal conversion. */ + inbytes = n; + status = (*__wcsmbs_gconv_fcts.towc->fct) (__wcsmbs_gconv_fcts.towc, + &data, s, &inbytes, NULL, 0); + + /* There must not be any problems with the conversion but illegal input + characters. The output buffer must be large enough, otherwise the + definition of MB_CUR_MAX is not correct. All the other possible + errors also must not happen. */ + assert (status == GCONV_OK || status == GCONV_ILLEGAL_INPUT + || status == GCONV_INCOMPLETE_INPUT); + + if (status == GCONV_OK) + { + if (*(wchar_t *)data.outbuf == L'\0') { - /* The second to sixths byte must be of the form 10xxxxxx. */ - unsigned char byte = (unsigned char) *s++; - ++used; - - if ((byte & 0xc0) != 0x80) - { - /* Oh, oh. An encoding error. */ - __set_errno (EILSEQ); - return (size_t) -1; - } - - ps->value <<= 6; - ps->value |= byte & 0x3f; - - if (--ps->count == 0) - { - /* The character is finished. */ - if (pwc != NULL) - *pwc = (wchar_t) ps->value; - return ps->value ? used : 0; - } + /* The converted character is the NUL character. */ + assert (mbsinit (data.statep)); + result = 0; } + else + result = n - inbytes; + } + else + { + result = status == GCONV_INCOMPLETE_INPUT ? (size_t) -2 : (size_t) -1; + __set_errno (EILSEQ); } - return (size_t) -2; + return result; } weak_alias (__mbrtowc, mbrtowc) |