diff options
Diffstat (limited to 'wcsmbs/wcsnrtombs.c')
| -rw-r--r-- | wcsmbs/wcsnrtombs.c | 155 |
1 files changed, 77 insertions, 78 deletions
diff --git a/wcsmbs/wcsnrtombs.c b/wcsmbs/wcsnrtombs.c index f6c8048..2dd9f7c 100644 --- a/wcsmbs/wcsnrtombs.c +++ b/wcsmbs/wcsnrtombs.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. @@ -18,26 +18,19 @@ 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 const wchar_t encoding_mask[] = -{ - ~0x7ff, ~0xffff, ~0x1fffff, ~0x3ffffff -}; - -static const unsigned char encoding_byte[] = -{ - 0xc0, 0xe0, 0xf0, 0xf8, 0xfc -}; - -/* 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; +/* This is the private state used if PS is NULL. */ +static mbstate_t state; /* This is a non-standard function but it is very useful in the implementation of stdio because we have to deal with unterminated @@ -50,85 +43,91 @@ __wcsnrtombs (dst, src, nwc, len, ps) size_t len; mbstate_t *ps; { - size_t written = 0; - const wchar_t *run = *src; + struct gconv_step_data data; + size_t inbytes_in; + int status; + size_t result; - if (ps == NULL) - ps = &internal; + /* Tell where we want the result. */ + data.is_last = 1; + data.statep = ps ?: &state; - if (dst == NULL) - /* The LEN parameter has to be ignored if we don't actually write - anything. */ - len = ~0; + if (nwc == 0) + return 0; + inbytes_in = __wcsnlen (*src, nwc - 1) + 1; - while (written < len && nwc-- > 0) - { - wchar_t wc; + /* Make sure we use the correct function. */ + update_conversion_ptrs (); - /* Store position of first unprocessed word. */ - *src = run; + /* We have to handle DST == NULL special. */ + if (dst == NULL) + { + char buf[256]; /* Just an arbitrary value. */ + size_t inbytes = inbytes_in; + const wchar_t *inbuf = *src; + size_t written; - wc = *run++; + data.outbuf = buf; + data.outbufsize = sizeof (buf); - if (wc < 0 || wc > 0x7fffffff) + do { - /* This is no correct ISO 10646 character. */ - __set_errno (EILSEQ); - return (size_t) -1; + inbuf += (inbytes_in - inbytes) / sizeof (wchar_t); + inbytes_in = inbytes; + data.outbufavail = 0; + written = 0; + + status = (*__wcsmbs_gconv_fcts.tomb->fct) (__wcsmbs_gconv_fcts.tomb, + &data, + (const char *) inbuf, + &inbytes, &written, 0); + result += written; } + while (status == GCONV_FULL_OUTPUT); - if (wc == L'\0') + if (status == GCONV_OK && dst[data.outbufavail - 1] == '\0') + /* Don't count the NUL character in. */ + --result; + } + else + { + /* This code is based on the safe assumption that all internal + multi-byte encodings use the NUL byte only to mark the end + of the string. */ + size_t inbytes = inbytes_in; + + data.outbuf = dst; + data.outbufavail = 0; + data.outbufsize = len; + + status = (*__wcsmbs_gconv_fcts.tomb->fct) (__wcsmbs_gconv_fcts.tomb, + &data, (const char *) *src, + &inbytes, &result, 0); + + /* We have to determine whether the last character converted + is the NUL character. */ + if (status == GCONV_OK && dst[data.outbufavail - 1] == '\0') { - /* Found the end. */ - if (dst != NULL) - *dst = '\0'; + assert (data.outbufavail > 0); + assert (mbsinit (data.statep)); *src = NULL; - return written; - } - else if (wc < 0x80) - { - /* It's an one byte sequence. */ - if (dst != NULL) - *dst++ = (char) wc; - ++written; + --result; } else - { - size_t step; - - for (step = 2; step < 6; ++step) - if ((wc & encoding_mask[step - 2]) == 0) - break; - - if (written + step >= len) - /* Too long. */ - break; - - if (dst != NULL) - { - size_t cnt = step; - - dst[0] = encoding_byte[cnt - 2]; - - --cnt; - do - { - dst[cnt] = 0x80 | (wc & 0x3f); - wc >>= 6; - } - while (--cnt > 0); - dst[0] |= wc; + *src += result; + } - dst += step; - } + /* There must not be any problems with the conversion but illegal input + characters. */ + assert (status == GCONV_OK || status == GCONV_ILLEGAL_INPUT + || status == GCONV_INCOMPLETE_INPUT || status == GCONV_FULL_OUTPUT); - written += step; - } + if (status != GCONV_OK && status != GCONV_FULL_OUTPUT) + { + result = (size_t) -1; + __set_errno (EILSEQ); } - /* Store position of first unprocessed word. */ - *src = run; - - return written; + return result; } weak_alias (__wcsnrtombs, wcsnrtombs) |