diff options
Diffstat (limited to 'iconvdata/iso646.c')
| -rw-r--r-- | iconvdata/iso646.c | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/iconvdata/iso646.c b/iconvdata/iso646.c new file mode 100644 index 0000000..db0c089 --- /dev/null +++ b/iconvdata/iso646.c @@ -0,0 +1,263 @@ +/* Conversion to and from the various ISO 646 CCS. + Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. + + 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 + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + 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 <gconv.h> +#include <stdlib.h> +#include <string.h> + +/* Direction of the transformation. */ +enum direction +{ + illegal, + to_iso646, + from_iso646 +}; + +enum variant +{ + US, /* ANSI_X3.4-1968 */ + GB, /* BS_4730 */ +}; + +struct iso646_data +{ + enum direction dir; + enum variant var; +}; + + +int +gconv_init (struct gconv_step *step, struct gconv_step_data *data) +{ + /* Determine which direction. */ + struct iso646_data *new_data; + enum direction dir; + enum variant var; + int result; + + if (strcasestr (step->from_name, "ANSI_X3.4-1968") != NULL) + { + dir = from_iso646; + var = US; + } + else if (strcasestr (step->from_name, "BS_4730") != NULL) + { + dir = from_iso646; + var = GB; + } + else if (strcasestr (step->to_name, "ANSI_X3.4-1968") != NULL) + { + dir = to_iso646; + var = US; + } + else if (strcasestr (step->to_name, "BS_4730") != NULL) + { + dir = to_iso646; + var = GB; + } + else + dir = illegal; + + result = GCONV_NOCONV; + if (dir != illegal + && ((new_data + = (struct iso646_data *) malloc (sizeof (struct iso646_data))) + != NULL)) + { + new_data->dir = dir; + new_data->var = var; + data->data = new_data; + result = GCONV_OK; + } + + return result; +} + + +void +gconv_end (struct gconv_step_data *data) +{ + free (data->data); +} + + +int +gconv (struct gconv_step *step, struct gconv_step_data *data, + const char *inbuf, size_t *inbufsize, size_t *written, int do_flush) +{ + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + gconv_fct fct = next_step->fct; + size_t do_write; + int result; + + /* If the function is called with no input this means we have to reset + to the initial state. The possibly partly converted input is + dropped. */ + if (do_flush) + { + do_write = 0; + + /* Call the steps down the chain if there are any. */ + if (data->is_last) + result = GCONV_OK; + else + { + struct gconv_step *next_step = step + 1; + struct gconv_step_data *next_data = data + 1; + + result = (*fct) (next_step, next_data, NULL, 0, written, 1); + + /* Clear output buffer. */ + data->outbufavail = 0; + } + } + else + { + enum direction dir = ((struct iso646_data *) data->data)->dir; + enum variant var = ((struct iso646_data *) data->data)->var; + + do_write = 0; + + do + { + result = GCONV_OK; + + if (dir == from_iso646) + { + size_t inchars = *inbufsize; + size_t outwchars = data->outbufavail; + char *outbuf = data->outbuf; + size_t cnt = 0; + + while (cnt < inchars + && (outwchars + sizeof (wchar_t) <= data->outbufsize)) + { + switch ((unsigned char) inbuf[cnt]) + { + case '\x23': + if (var == GB) + *((wchar_t *) (outbuf + outwchars)) = 0xa3; + else + *((wchar_t *) (outbuf + outwchars)) = 0x23; + break; + case '\x75': + if (var == GB) + *((wchar_t *) (outbuf + outwchars)) = 0x203e; + else + *((wchar_t *) (outbuf + outwchars)) = 0x75; + break; + default: + *((wchar_t *) (outbuf + outwchars)) = + (unsigned char) inbuf[cnt]; + } + ++do_write; + outwchars += sizeof (wchar_t); + ++cnt; + } + *inbufsize -= cnt; + data->outbufavail = outwchars; + } + else + { + size_t inwchars = *inbufsize; + size_t outchars = data->outbufavail; + char *outbuf = data->outbuf; + size_t cnt = 0; + + while (inwchars >= cnt + sizeof (wchar_t) + && outchars < data->outbufsize) + { + if (*((wchar_t *) (inbuf + cnt)) >= L'\0' + && *((wchar_t *) (inbuf + cnt)) <= L'\177') + outbuf[outchars] = *((wchar_t *) (inbuf + cnt)); + else + /* Here is where the transliteration would enter the + scene. */ + break; + + ++do_write; + ++outchars; + cnt += sizeof (wchar_t); + } + *inbufsize -= cnt; + data->outbufavail = outchars; + + if (outchars < data->outbufsize) + { + /* If there is still room in the output buffer something + is wrong with the input. */ + if (inwchars >= cnt + sizeof (wchar_t)) + { + /* An error occurred. */ + result = GCONV_ILLEGAL_INPUT; + break; + } + if (inwchars != cnt) + { + /* There are some unprocessed bytes at the end of the + input buffer. */ + result = GCONV_INCOMPLETE_INPUT; + break; + } + } + } + + if (result != GCONV_OK) + break; + + if (data->is_last) + { + /* This is the last step. */ + result = (*inbufsize > (dir == from_iso646 + ? 0 : sizeof (wchar_t) - 1) + ? GCONV_FULL_OUTPUT : GCONV_EMPTY_INPUT); + break; + } + + /* Status so far. */ + result = GCONV_EMPTY_INPUT; + + if (data->outbufavail > 0) + { + /* Call the functions below in the chain. */ + size_t newavail = data->outbufavail; + + result = (*fct) (next_step, next_data, data->outbuf, &newavail, + written, 0); + + /* Correct the output buffer. */ + if (newavail != data->outbufavail && newavail > 0) + { + memmove (data->outbuf, + &data->outbuf[data->outbufavail - newavail], + newavail); + data->outbufavail = newavail; + } + } + } + while (*inbufsize > 0 && result == GCONV_EMPTY_INPUT); + } + + if (written != NULL && data->is_last) + *written = do_write; + + return result; +} |