diff options
Diffstat (limited to 'wcsmbs/mbsrtowcs.c')
| -rw-r--r-- | wcsmbs/mbsrtowcs.c | 114 |
1 files changed, 94 insertions, 20 deletions
diff --git a/wcsmbs/mbsrtowcs.c b/wcsmbs/mbsrtowcs.c index dc026b7..712b199 100644 --- a/wcsmbs/mbsrtowcs.c +++ b/wcsmbs/mbsrtowcs.c @@ -1,6 +1,6 @@ /* Copyright (C) 1996 Free Software Foundation, Inc. This file is part of the GNU C Library. -Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu> +Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as @@ -17,9 +17,16 @@ License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <errno.h> #include <wchar.h> +#ifndef EILSEQ +#define EILSEQ EINVAL +#endif + +/* We don't need the state really because we don't have shift states + to maintain between calls to this function. */ static mbstate_t internal; size_t @@ -29,35 +36,102 @@ mbsrtowcs (dst, src, len, ps) size_t len; mbstate_t *ps; { - size_t result = 0; + size_t written = 0; + const char *run = *src; if (ps == NULL) ps = &internal; - /*************************************************************\ - |* This is no complete implementation. While the multi-byte *| - |* character handling is not finished this will do. *| - \*************************************************************/ + if (dst == NULL) + /* The LEN parameter has to be ignored if we don't actually write + anything. */ + len = ~0; - while (len > 0 && **src != '\0') + /* Copy all words. */ + while (written < len) { - /* For now there is no possibly illegal MB char sequence. */ - if (dst != NULL) - dst[result] = (wchar_t) **src; - ++result; - ++(*src); - --len; - } + wchar_t value; + size_t count; + unsigned char byte = *run++; - if (len > 0) - { + /* We expect a start of a new multibyte character. */ + if (byte < 0x80) + { + /* One byte sequence. */ + count = 0; + value = byte; + } + else if ((byte & 0xe0) == 0xc0) + { + count = 1; + value = byte & 0x1f; + } + else if ((byte & 0xf0) == 0xe0) + { + /* We expect three bytes. */ + count = 2; + value = byte & 0x0f; + } + else if ((byte & 0xf8) == 0xf0) + { + /* We expect four bytes. */ + count = 3; + value = byte & 0x07; + } + else if ((byte & 0xfc) == 0xf8) + { + /* We expect five bytes. */ + count = 4; + value = byte & 0x03; + } + else if ((byte & 0xfe) == 0xfc) + { + /* We expect six bytes. */ + count = 5; + value = byte & 0x01; + } + else + { + /* This is an illegal encoding. */ + errno = EILSEQ; + return (size_t) -1; + } + + /* Read the possible remaining bytes. */ + while (count-- > 0) + { + byte = *run++; + + if ((byte & 0xc0) != 0x80) + { + /* This is an illegal encoding. */ + errno = EILSEQ; + return (size_t) -1; + } + + value <<= 6; + value |= byte & 0x3f; + } + + /* Store value is required. */ if (dst != NULL) + *dst++ = value; + + /* The whole sequence is read. Check whether end of string is + reached. */ + if (value == L'\0') { - dst[result] = L'\0'; - *ps = 0; + /* Found the end of the string. */ + *src = NULL; + return written; } - *src = NULL; + + /* Increment counter of produced words. */ + ++written; } - return result; + /* Store address of next byte to process. */ + *src = run; + + return written; } |