/src/libunistring/lib/unicase/u-casemap.h

Source (jump to first uncovered line)
/* Case mapping for UTF-8/UTF-16/UTF-32 strings (locale dependent).
   Copyright (C) 2009-2024 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2009.

   This file is free software.
   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
   You can redistribute it and/or modify it under either
     - the terms of the GNU Lesser General Public License as published
       by the Free Software Foundation, either version 3, or (at your
       option) any later version, or
     - the terms of the GNU General Public License as published by the
       Free Software Foundation; either version 2, or (at your option)
       any later version, or
     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".

   This file 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
   Lesser General Public License and the GNU General Public License
   for more details.

   You should have received a copy of the GNU Lesser General Public
   License and of the GNU General Public License along with this
   program.  If not, see <https://www.gnu.org/licenses/>.  */

UNIT *
FUNC (const UNIT *s, size_t n,
      casing_prefix_context_t prefix_context,
      casing_suffix_context_t suffix_context,
      const char *iso639_language,
      ucs4_t (*single_character_map) (ucs4_t),
      size_t offset_in_rule, /* offset in 'struct special_casing_rule' */
      uninorm_t nf,
      UNIT *resultbuf, size_t *lengthp)
{
  /* The result being accumulated.  */
  UNIT *result;
  size_t length;
  size_t allocated;

  /* Initialize the accumulator.  */
  if (nf != NULL || resultbuf == NULL)
    {
      result = NULL;
      allocated = 0;
    }
  else
    {
      result = resultbuf;
      allocated = *lengthp;
    }
  length = 0;

  {
    const UNIT *s_end = s + n;

    /* Helper for evaluating the FINAL_SIGMA condition:
       Last character that was not case-ignorable.  */
    ucs4_t last_char_except_ignorable =
      prefix_context.last_char_except_ignorable;

    /* Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions:
       Last character that was of combining class 230 ("Above") or 0.  */
    ucs4_t last_char_normal_or_above =
      prefix_context.last_char_normal_or_above;

    while (s < s_end)
      {
        ucs4_t uc;
        int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);

        ucs4_t mapped_uc[3];
        unsigned int mapped_count;

        if (uc < 0x10000)
          {
            /* Look first in the special-casing table.  */
            char code[3];

            code[0] = (uc >> 8) & 0xff;
            code[1] = uc & 0xff;

            for (code[2] = 0; ; code[2]++)
              {
                const struct special_casing_rule *rule =
                  gl_unicase_special_lookup (code, 3);

                if (rule == NULL)
                  break;

                /* Test if the condition applies.  */
                /* Does the language apply?  */
                if (rule->language[0] == '\0'
                    || (iso639_language != NULL
                        && iso639_language[0] == rule->language[0]
                        && iso639_language[1] == rule->language[1]))
                  {
                    /* Does the context apply?  */
                    int context = rule->context;
                    bool applies;

                    if (context < 0)
                      context = - context;
                    switch (context)
                      {
                      case SCC_ALWAYS:
                        applies = true;
                        break;

                      case SCC_FINAL_SIGMA:
                        /* "Before" condition: preceded by a sequence
                           consisting of a cased letter and a case-ignorable
                           sequence.
                           "After" condition: not followed by a sequence
                           consisting of a case-ignorable sequence and then a
                           cased letter.  */
                        /* Test the "before" condition.  */
                        applies = uc_is_cased (last_char_except_ignorable);
                        /* Test the "after" condition.  */
                        if (applies)
                          {
                            const UNIT *s2 = s + count;
                            for (;;)
                              {
                                if (s2 < s_end)
                                  {
                                    ucs4_t uc2;
                                    int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
                                    /* Our uc_is_case_ignorable function is
                                       known to return false for all cased
                                       characters.  So we can call
                                       uc_is_case_ignorable first.  */
                                    if (!uc_is_case_ignorable (uc2))
                                      {
                                        applies = ! uc_is_cased (uc2);
                                        break;
                                      }
                                    s2 += count2;
                                  }
                                else
                                  {
                                    applies = ! uc_is_cased (suffix_context.first_char_except_ignorable);
                                    break;
                                  }
                              }
                          }
                        break;

                      case SCC_AFTER_SOFT_DOTTED:
                        /* "Before" condition: There is a Soft_Dotted character
                           before it, with no intervening character of
                           combining class 0 or 230 (Above).  */
                        /* Test the "before" condition.  */
                        applies = uc_is_property_soft_dotted (last_char_normal_or_above);
                        break;

                      case SCC_MORE_ABOVE:
                        /* "After" condition: followed by a character of
                           combining class 230 (Above) with no intervening
                           character of combining class 0 or 230 (Above).  */
                        /* Test the "after" condition.  */
                        {
                          const UNIT *s2 = s + count;
                          applies = false;
                          for (;;)
                            {
                              if (s2 < s_end)
                                {
                                  ucs4_t uc2;
                                  int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
                                  int ccc = uc_combining_class (uc2);
                                  if (ccc == UC_CCC_A)
                                    {
                                      applies = true;
                                      break;
                                    }
                                  if (ccc == UC_CCC_NR)
                                    break;
                                  s2 += count2;
                                }
                              else
                                {
                                  applies = ((suffix_context.bits & SCC_MORE_ABOVE_MASK) != 0);
                                  break;
                                }
                            }
                        }
                        break;

                      case SCC_BEFORE_DOT:
                        /* "After" condition: followed by COMBINING DOT ABOVE
                           (U+0307). Any sequence of characters with a
                           combining class that is neither 0 nor 230 may
                           intervene between the current character and the
                           combining dot above.  */
                        /* Test the "after" condition.  */
                        {
                          const UNIT *s2 = s + count;
                          applies = false;
                          for (;;)
                            {
                              if (s2 < s_end)
                                {
                                  ucs4_t uc2;
                                  int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
                                  if (uc2 == 0x0307) /* COMBINING DOT ABOVE */
                                    {
                                      applies = true;
                                      break;
                                    }
                                  {
                                    int ccc = uc_combining_class (uc2);
                                    if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
                                      break;
                                  }
                                  s2 += count2;
                                }
                              else
                                {
                                  applies = ((suffix_context.bits & SCC_BEFORE_DOT_MASK) != 0);
                                  break;
                                }
                            }
                        }
                        break;

                      case SCC_AFTER_I:
                        /* "Before" condition: There is an uppercase I before
                           it, and there is no intervening character of
                           combining class 0 or 230 (Above).  */
                        /* Test the "before" condition.  */
                        applies = (last_char_normal_or_above == 'I');
                        break;

                      default:
                        abort ();
                      }
                    if (rule->context < 0)
                      applies = !applies;

                    if (applies)
                      {
                        /* The rule applies.
                           Look up the mapping (0 to 3 characters).  */
                        const unsigned short *mapped_in_rule =
                          (const unsigned short *)((const char *)rule + offset_in_rule);

                        if (mapped_in_rule[0] == 0)
                          mapped_count = 0;
                        else
                          {
                            mapped_uc[0] = mapped_in_rule[0];
                            if (mapped_in_rule[1] == 0)
                              mapped_count = 1;
                            else
                              {
                                mapped_uc[1] = mapped_in_rule[1];
                                if (mapped_in_rule[2] == 0)
                                  mapped_count = 2;
                                else
                                  {
                                    mapped_uc[2] = mapped_in_rule[2];
                                    mapped_count = 3;
                                  }
                              }
                          }
                        goto found_mapping;
                      }
                  }

                /* Optimization: Save a hash table lookup in the next round.  */
                if (!rule->has_next)
                  break;
              }
          }

        /* No special-cased mapping.  So use the locale and context independent
           mapping.  */
        mapped_uc[0] = single_character_map (uc);
        mapped_count = 1;

       found_mapping:
        /* Found the mapping: uc maps to mapped_uc[0..mapped_count-1].  */
        {
          unsigned int i;

          for (i = 0; i < mapped_count; i++)
            {
              ucs4_t muc = mapped_uc[i];

              /* Append muc to the result accumulator.  */
              if (length < allocated)
                {
                  int ret = U_UCTOMB (result + length, muc, allocated - length);
                  if (ret == -1)
                    {
                      errno = EINVAL;
                      goto fail;
                    }
                  if (ret >= 0)
                    {
                      length += ret;
                      goto done_appending;
                    }
                }
              {
                size_t old_allocated = allocated;
                size_t new_allocated = 2 * old_allocated;
                if (new_allocated < 64)
                  new_allocated = 64;
                if (new_allocated < old_allocated) /* integer overflow? */
                  abort ();
                {
                  UNIT *larger_result;
                  if (result == NULL)
                    {
                      larger_result = (UNIT *) malloc (new_allocated * sizeof (UNIT));
                      if (larger_result == NULL)
                        {
                          errno = ENOMEM;
                          goto fail;
                        }
                    }
                  else if (result == resultbuf)
                    {
                      larger_result = (UNIT *) malloc (new_allocated * sizeof (UNIT));
                      if (larger_result == NULL)
                        {
                          errno = ENOMEM;
                          goto fail;
                        }
                      U_CPY (larger_result, resultbuf, length);
                    }
                  else
                    {
                      larger_result =
                        (UNIT *) realloc (result, new_allocated * sizeof (UNIT));
                      if (larger_result == NULL)
                        {
                          errno = ENOMEM;
                          goto fail;
                        }
                    }
                  result = larger_result;
                  allocated = new_allocated;
                  {
                    int ret = U_UCTOMB (result + length, muc, allocated - length);
                    if (ret == -1)
                      {
                        errno = EINVAL;
                        goto fail;
                      }
                    if (ret < 0)
                      abort ();
                    length += ret;
                    goto done_appending;
                  }
                }
              }
             done_appending: ;
            }
        }

        if (!uc_is_case_ignorable (uc))
          last_char_except_ignorable = uc;

        {
          int ccc = uc_combining_class (uc);
          if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
            last_char_normal_or_above = uc;
        }

        s += count;
      }
  }

  if (nf != NULL)
    {
      /* Finally, normalize the result.  */
      UNIT *normalized_result;

      normalized_result = U_NORMALIZE (nf, result, length, resultbuf, lengthp);
      if (normalized_result == NULL)
        goto fail;

      free (result);
      return normalized_result;
    }

  if (length == 0)
    {
      if (result == NULL)
        {
          /* Return a non-NULL value.  NULL means error.  */
          result = (UNIT *) malloc (1);
          if (result == NULL)
            {
              errno = ENOMEM;
              goto fail;
            }
        }
    }
  else if (result != resultbuf && length < allocated)
    {
      /* Shrink the allocated memory if possible.  */
      UNIT *memory;

      memory = (UNIT *) realloc (result, length * sizeof (UNIT));
      if (memory != NULL)
        result = memory;
    }

  *lengthp = length;
  return result;

 fail:
  if (result != resultbuf)
    {
      int saved_errno = errno;
      free (result);
      errno = saved_errno;
    }
  return NULL;
}

Coverage Report

Created: 2025-03-06 07:58

Line	Count	Source (jump to first uncovered line)
1		/* Case mapping for UTF-8/UTF-16/UTF-32 strings (locale dependent).
2		Copyright (C) 2009-2024 Free Software Foundation, Inc.
3		Written by Bruno Haible <bruno@clisp.org>, 2009.
4
5		This file is free software.
6		It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
7		You can redistribute it and/or modify it under either
8		- the terms of the GNU Lesser General Public License as published
9		by the Free Software Foundation, either version 3, or (at your
10		option) any later version, or
11		- the terms of the GNU General Public License as published by the
12		Free Software Foundation; either version 2, or (at your option)
13		any later version, or
14		- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
15
16		This file is distributed in the hope that it will be useful,
17		but WITHOUT ANY WARRANTY; without even the implied warranty of
18		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19		Lesser General Public License and the GNU General Public License
20		for more details.
21
22		You should have received a copy of the GNU Lesser General Public
23		License and of the GNU General Public License along with this
24		program. If not, see <https://www.gnu.org/licenses/>. */
25
26		UNIT *
27		FUNC (const UNIT *s, size_t n,
28		casing_prefix_context_t prefix_context,
29		casing_suffix_context_t suffix_context,
30		const char *iso639_language,
31		ucs4_t (*single_character_map) (ucs4_t),
32		size_t offset_in_rule, /* offset in 'struct special_casing_rule' */
33		uninorm_t nf,
34		UNIT resultbuf, size_t lengthp)
35	0	{
36		/* The result being accumulated. */
37	0	UNIT *result;
38	0	size_t length;
39	0	size_t allocated;
40
41		/* Initialize the accumulator. */
42	0	if (nf != NULL \|\| resultbuf == NULL)
43	0	{
44	0	result = NULL;
45	0	allocated = 0;
46	0	}
47	0	else
48	0	{
49	0	result = resultbuf;
50	0	allocated = *lengthp;
51	0	}
52	0	length = 0;
53
54	0	{
55	0	const UNIT *s_end = s + n;
56
57		/* Helper for evaluating the FINAL_SIGMA condition:
58		Last character that was not case-ignorable. */
59	0	ucs4_t last_char_except_ignorable =
60	0	prefix_context.last_char_except_ignorable;
61
62		/* Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions:
63		Last character that was of combining class 230 ("Above") or 0. */
64	0	ucs4_t last_char_normal_or_above =
65	0	prefix_context.last_char_normal_or_above;
66
67	0	while (s < s_end)
68	0	{
69	0	ucs4_t uc;
70	0	int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);
71
72	0	ucs4_t mapped_uc[3];
73	0	unsigned int mapped_count;
74
75	0	if (uc < 0x10000)
76	0	{
77		/* Look first in the special-casing table. */
78	0	char code[3];
79
80	0	code[0] = (uc >> 8) & 0xff;
81	0	code[1] = uc & 0xff;
82
83	0	for (code[2] = 0; ; code[2]++)
84	0	{
85	0	const struct special_casing_rule *rule =
86	0	gl_unicase_special_lookup (code, 3);
87
88	0	if (rule == NULL)
89	0	break;
90
91		/* Test if the condition applies. */
92		/* Does the language apply? */
93	0	if (rule->language[0] == '\0'
94	0	\|\| (iso639_language != NULL
95	0	&& iso639_language[0] == rule->language[0]
96	0	&& iso639_language[1] == rule->language[1]))
97	0	{
98		/* Does the context apply? */
99	0	int context = rule->context;
100	0	bool applies;
101
102	0	if (context < 0)
103	0	context = - context;
104	0	switch (context)
105	0	{
106	0	case SCC_ALWAYS:
107	0	applies = true;
108	0	break;
109
110	0	case SCC_FINAL_SIGMA:
111		/* "Before" condition: preceded by a sequence
112		consisting of a cased letter and a case-ignorable
113		sequence.
114		"After" condition: not followed by a sequence
115		consisting of a case-ignorable sequence and then a
116		cased letter. */
117		/* Test the "before" condition. */
118	0	applies = uc_is_cased (last_char_except_ignorable);
119		/* Test the "after" condition. */
120	0	if (applies)
121	0	{
122	0	const UNIT *s2 = s + count;
123	0	for (;;)
124	0	{
125	0	if (s2 < s_end)
126	0	{
127	0	ucs4_t uc2;
128	0	int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
129		/* Our uc_is_case_ignorable function is
130		known to return false for all cased
131		characters. So we can call
132		uc_is_case_ignorable first. */
133	0	if (!uc_is_case_ignorable (uc2))
134	0	{
135	0	applies = ! uc_is_cased (uc2);
136	0	break;
137	0	}
138	0	s2 += count2;
139	0	}
140	0	else
141	0	{
142	0	applies = ! uc_is_cased (suffix_context.first_char_except_ignorable);
143	0	break;
144	0	}
145	0	}
146	0	}
147	0	break;
148
149	0	case SCC_AFTER_SOFT_DOTTED:
150		/* "Before" condition: There is a Soft_Dotted character
151		before it, with no intervening character of
152		combining class 0 or 230 (Above). */
153		/* Test the "before" condition. */
154	0	applies = uc_is_property_soft_dotted (last_char_normal_or_above);
155	0	break;
156
157	0	case SCC_MORE_ABOVE:
158		/* "After" condition: followed by a character of
159		combining class 230 (Above) with no intervening
160		character of combining class 0 or 230 (Above). */
161		/* Test the "after" condition. */
162	0	{
163	0	const UNIT *s2 = s + count;
164	0	applies = false;
165	0	for (;;)
166	0	{
167	0	if (s2 < s_end)
168	0	{
169	0	ucs4_t uc2;
170	0	int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
171	0	int ccc = uc_combining_class (uc2);
172	0	if (ccc == UC_CCC_A)
173	0	{
174	0	applies = true;
175	0	break;
176	0	}
177	0	if (ccc == UC_CCC_NR)
178	0	break;
179	0	s2 += count2;
180	0	}
181	0	else
182	0	{
183	0	applies = ((suffix_context.bits & SCC_MORE_ABOVE_MASK) != 0);
184	0	break;
185	0	}
186	0	}
187	0	}
188	0	break;
189
190	0	case SCC_BEFORE_DOT:
191		/* "After" condition: followed by COMBINING DOT ABOVE
192		(U+0307). Any sequence of characters with a
193		combining class that is neither 0 nor 230 may
194		intervene between the current character and the
195		combining dot above. */
196		/* Test the "after" condition. */
197	0	{
198	0	const UNIT *s2 = s + count;
199	0	applies = false;
200	0	for (;;)
201	0	{
202	0	if (s2 < s_end)
203	0	{
204	0	ucs4_t uc2;
205	0	int count2 = U_MBTOUC_UNSAFE (&uc2, s2, s_end - s2);
206	0	if (uc2 == 0x0307) /* COMBINING DOT ABOVE */
207	0	{
208	0	applies = true;
209	0	break;
210	0	}
211	0	{
212	0	int ccc = uc_combining_class (uc2);
213	0	if (ccc == UC_CCC_A \|\| ccc == UC_CCC_NR)
214	0	break;
215	0	}
216	0	s2 += count2;
217	0	}
218	0	else
219	0	{
220	0	applies = ((suffix_context.bits & SCC_BEFORE_DOT_MASK) != 0);
221	0	break;
222	0	}
223	0	}
224	0	}
225	0	break;
226
227	0	case SCC_AFTER_I:
228		/* "Before" condition: There is an uppercase I before
229		it, and there is no intervening character of
230		combining class 0 or 230 (Above). */
231		/* Test the "before" condition. */
232	0	applies = (last_char_normal_or_above == 'I');
233	0	break;
234
235	0	default:
236	0	abort ();
237	0	}
238	0	if (rule->context < 0)
239	0	applies = !applies;
240
241	0	if (applies)
242	0	{
243		/* The rule applies.
244		Look up the mapping (0 to 3 characters). */
245	0	const unsigned short *mapped_in_rule =
246	0	(const unsigned short )((const char )rule + offset_in_rule);
247
248	0	if (mapped_in_rule[0] == 0)
249	0	mapped_count = 0;
250	0	else
251	0	{
252	0	mapped_uc[0] = mapped_in_rule[0];
253	0	if (mapped_in_rule[1] == 0)
254	0	mapped_count = 1;
255	0	else
256	0	{
257	0	mapped_uc[1] = mapped_in_rule[1];
258	0	if (mapped_in_rule[2] == 0)
259	0	mapped_count = 2;
260	0	else
261	0	{
262	0	mapped_uc[2] = mapped_in_rule[2];
263	0	mapped_count = 3;
264	0	}
265	0	}
266	0	}
267	0	goto found_mapping;
268	0	}
269	0	}
270
271		/* Optimization: Save a hash table lookup in the next round. */
272	0	if (!rule->has_next)
273	0	break;
274	0	}
275	0	}
276
277		/* No special-cased mapping. So use the locale and context independent
278		mapping. */
279	0	mapped_uc[0] = single_character_map (uc);
280	0	mapped_count = 1;
281
282	0	found_mapping:
283		/* Found the mapping: uc maps to mapped_uc[0..mapped_count-1]. */
284	0	{
285	0	unsigned int i;
286
287	0	for (i = 0; i < mapped_count; i++)
288	0	{
289	0	ucs4_t muc = mapped_uc[i];
290
291		/* Append muc to the result accumulator. */
292	0	if (length < allocated)
293	0	{
294	0	int ret = U_UCTOMB (result + length, muc, allocated - length);
295	0	if (ret == -1)
296	0	{
297	0	errno = EINVAL;
298	0	goto fail;
299	0	}
300	0	if (ret >= 0)
301	0	{
302	0	length += ret;
303	0	goto done_appending;
304	0	}
305	0	}
306	0	{
307	0	size_t old_allocated = allocated;
308	0	size_t new_allocated = 2 * old_allocated;
309	0	if (new_allocated < 64)
310	0	new_allocated = 64;
311	0	if (new_allocated < old_allocated) /* integer overflow? */
312	0	abort ();
313	0	{
314	0	UNIT *larger_result;
315	0	if (result == NULL)
316	0	{
317	0	larger_result = (UNIT ) malloc (new_allocated sizeof (UNIT));
318	0	if (larger_result == NULL)
319	0	{
320	0	errno = ENOMEM;
321	0	goto fail;
322	0	}
323	0	}
324	0	else if (result == resultbuf)
325	0	{
326	0	larger_result = (UNIT ) malloc (new_allocated sizeof (UNIT));
327	0	if (larger_result == NULL)
328	0	{
329	0	errno = ENOMEM;
330	0	goto fail;
331	0	}
332	0	U_CPY (larger_result, resultbuf, length);
333	0	}
334	0	else
335	0	{
336	0	larger_result =
337	0	(UNIT ) realloc (result, new_allocated sizeof (UNIT));
338	0	if (larger_result == NULL)
339	0	{
340	0	errno = ENOMEM;
341	0	goto fail;
342	0	}
343	0	}
344	0	result = larger_result;
345	0	allocated = new_allocated;
346	0	{
347	0	int ret = U_UCTOMB (result + length, muc, allocated - length);
348	0	if (ret == -1)
349	0	{
350	0	errno = EINVAL;
351	0	goto fail;
352	0	}
353	0	if (ret < 0)
354	0	abort ();
355	0	length += ret;
356	0	goto done_appending;
357	0	}
358	0	}
359	0	}
360	0	done_appending: ;
361	0	}
362	0	}
363
364	0	if (!uc_is_case_ignorable (uc))
365	0	last_char_except_ignorable = uc;
366
367	0	{
368	0	int ccc = uc_combining_class (uc);
369	0	if (ccc == UC_CCC_A \|\| ccc == UC_CCC_NR)
370	0	last_char_normal_or_above = uc;
371	0	}
372
373	0	s += count;
374	0	}
375	0	}
376
377	0	if (nf != NULL)
378	0	{
379		/* Finally, normalize the result. */
380	0	UNIT *normalized_result;
381
382	0	normalized_result = U_NORMALIZE (nf, result, length, resultbuf, lengthp);
383	0	if (normalized_result == NULL)
384	0	goto fail;
385
386	0	free (result);
387	0	return normalized_result;
388	0	}
389
390	0	if (length == 0)
391	0	{
392	0	if (result == NULL)
393	0	{
394		/* Return a non-NULL value. NULL means error. */
395	0	result = (UNIT *) malloc (1);
396	0	if (result == NULL)
397	0	{
398	0	errno = ENOMEM;
399	0	goto fail;
400	0	}
401	0	}
402	0	}
403	0	else if (result != resultbuf && length < allocated)
404	0	{
405		/* Shrink the allocated memory if possible. */
406	0	UNIT *memory;
407
408	0	memory = (UNIT ) realloc (result, length sizeof (UNIT));
409	0	if (memory != NULL)
410	0	result = memory;
411	0	}
412
413	0	*lengthp = length;
414	0	return result;
415
416	0	fail:
417	0	if (result != resultbuf)
418	0	{
419	0	int saved_errno = errno;
420	0	free (result);
421	0	errno = saved_errno;
422	0	}
423	0	return NULL;
424	0	}