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Diffstat (limited to 'wcsmbs/wcsnrtombs.c')
-rw-r--r--wcsmbs/wcsnrtombs.c155
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)