8.1.0beta4/libltdl/argz.c

/* argz.c -- argz implementation for non-glibc systems

   Copyright (C) 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
   Written by Gary V. Vaughan, 2004

   NOTE: The canonical source of this file is maintained with the
   GNU Libtool package.  Report bugs to bug-libtool@gnu.org.

GNU Libltdl is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

As a special exception to the GNU Lesser General Public License,
if you distribute this file as part of a program or library that
is built using GNU Libtool, you may include this file under the
same distribution terms that you use for the rest of that program.

GNU Libltdl 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 for more details.

You should have received a copy of the GNU Lesser General Public
License along with GNU Libltdl; see the file COPYING.LIB.  If not, a
copy can be downloaded from  http://www.gnu.org/licenses/lgpl.html,
or obtained by writing to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/

#if defined(LTDL) && defined LT_CONFIG_H
#  include LT_CONFIG_H
#else
#  include <config.h>
#endif

#include <argz.h>

#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/types.h>
#include <errno.h>
#include <string.h>

#define EOS_CHAR '\0'

error_t
argz_append (char **pargz, size_t *pargz_len, const char *buf, size_t buf_len)
{
  size_t argz_len;
  char  *argz;

  assert (pargz);
  assert (pargz_len);
  assert ((*pargz && *pargz_len) || (!*pargz && !*pargz_len));

  /* If nothing needs to be appended, no more work is required.  */
  if (buf_len == 0)
    return 0;

  /* Ensure there is enough room to append BUF_LEN.  */
  argz_len = *pargz_len + buf_len;
  argz = (char *) realloc (*pargz, argz_len);
  if (!argz)
    return ENOMEM;

  /* Copy characters from BUF after terminating '\0' in ARGZ.  */
  memcpy (argz + *pargz_len, buf, buf_len);

  /* Assign new values.  */
  *pargz = argz;
  *pargz_len = argz_len;

  return 0;
}


error_t
argz_create_sep (const char *str, int delim, char **pargz, size_t *pargz_len)
{
  size_t argz_len;
  char *argz = 0;

  assert (str);
  assert (pargz);
  assert (pargz_len);

  /* Make a copy of STR, but replacing each occurrence of
     DELIM with '\0'.  */
  argz_len = 1+ strlen (str);
  if (argz_len)
    {
      const char *p;
      char *q;

      argz = (char *) malloc (argz_len);
      if (!argz)
        return ENOMEM;

      for (p = str, q = argz; *p != EOS_CHAR; ++p)
        {
          if (*p == delim)
            {
              /* Ignore leading delimiters, and fold consecutive
                 delimiters in STR into a single '\0' in ARGZ.  */
              if ((q > argz) && (q[-1] != EOS_CHAR))
                *q++ = EOS_CHAR;
              else
                --argz_len;
            }
          else
            *q++ = *p;
        }
      /* Copy terminating EOS_CHAR.  */
      *q = *p;
    }

  /* If ARGZ_LEN has shrunk to nothing, release ARGZ's memory.  */
  if (!argz_len)
    argz = (free (argz), (char *) 0);

  /* Assign new values.  */
  *pargz = argz;
  *pargz_len = argz_len;

  return 0;
}


error_t
argz_insert (char **pargz, size_t *pargz_len, char *before, const char *entry)
{
  assert (pargz);
  assert (pargz_len);
  assert (entry && *entry);

  /* No BEFORE address indicates ENTRY should be inserted after the
     current last element.  */
  if (!before)
    return argz_append (pargz, pargz_len, entry, 1+ strlen (entry));

  /* This probably indicates a programmer error, but to preserve
     semantics, scan back to the start of an entry if BEFORE points
     into the middle of it.  */
  while ((before > *pargz) && (before[-1] != EOS_CHAR))
    --before;

  {
    size_t entry_len    = 1+ strlen (entry);
    size_t argz_len     = *pargz_len + entry_len;
    size_t offset       = before - *pargz;
    char   *argz        = (char *) realloc (*pargz, argz_len);

    if (!argz)
      return ENOMEM;

    /* Make BEFORE point to the equivalent offset in ARGZ that it
       used to have in *PARGZ incase realloc() moved the block.  */
    before = argz + offset;

    /* Move the ARGZ entries starting at BEFORE up into the new
       space at the end -- making room to copy ENTRY into the
       resulting gap.  */
    memmove (before + entry_len, before, *pargz_len - offset);
    memcpy  (before, entry, entry_len);

    /* Assign new values.  */
    *pargz = argz;
    *pargz_len = argz_len;
  }

  return 0;
}


char *
argz_next (char *argz, size_t argz_len, const char *entry)
{
  assert ((argz && argz_len) || (!argz && !argz_len));

  if (entry)
    {
      /* Either ARGZ/ARGZ_LEN is empty, or ENTRY points into an address
         within the ARGZ vector.  */
      assert ((!argz && !argz_len)
              || ((argz <= entry) && (entry < (argz + argz_len))));

      /* Move to the char immediately after the terminating
         '\0' of ENTRY.  */
      entry = 1+ strchr (entry, EOS_CHAR);

      /* Return either the new ENTRY, or else NULL if ARGZ is
         exhausted.  */
      return (entry >= argz + argz_len) ? 0 : (char *) entry;
    }
  else
    {
      /* This should probably be flagged as a programmer error,
         since starting an argz_next loop with the iterator set
         to ARGZ is safer.  To preserve semantics, handle the NULL
         case by returning the start of ARGZ (if any).  */
      if (argz_len > 0)
        return argz;
      else
        return 0;
    }
}


void
argz_stringify (char *argz, size_t argz_len, int sep)
{
  assert ((argz && argz_len) || (!argz && !argz_len));

  if (sep)
    {
      --argz_len;               /* don't stringify the terminating EOS */
      while (--argz_len > 0)
        {
          if (argz[argz_len] == EOS_CHAR)
            argz[argz_len] = sep;
        }
    }
}

Revision:	1988
Committed:	Thu May 9 14:27:04 2013 UTC (13 years, 2 months ago) by michael
Content type:	text/x-csrc
File size:	5903 byte(s)
Log Message:	RELEASE TAG 8.1.0beta4
#	Content
1	/* argz.c -- argz implementation for non-glibc systems
2
3	Copyright (C) 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
4	Written by Gary V. Vaughan, 2004
5
6	NOTE: The canonical source of this file is maintained with the
7	GNU Libtool package. Report bugs to bug-libtool@gnu.org.
8
9	GNU Libltdl is free software; you can redistribute it and/or
10	modify it under the terms of the GNU Lesser General Public
11	License as published by the Free Software Foundation; either
12	version 2 of the License, or (at your option) any later version.
13
14	As a special exception to the GNU Lesser General Public License,
15	if you distribute this file as part of a program or library that
16	is built using GNU Libtool, you may include this file under the
17	same distribution terms that you use for the rest of that program.
18
19	GNU Libltdl is distributed in the hope that it will be useful,
20	but WITHOUT ANY WARRANTY; without even the implied warranty of
21	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22	GNU Lesser General Public License for more details.
23
24	You should have received a copy of the GNU Lesser General Public
25	License along with GNU Libltdl; see the file COPYING.LIB. If not, a
26	copy can be downloaded from http://www.gnu.org/licenses/lgpl.html,
27	or obtained by writing to the Free Software Foundation, Inc.,
28	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
29	*/
30
31	#if defined(LTDL) && defined LT_CONFIG_H
32	# include LT_CONFIG_H
33	#else
34	# include <config.h>
35	#endif
36
37	#include <argz.h>
38
39	#include <assert.h>
40	#include <stddef.h>
41	#include <stdlib.h>
42	#include <sys/types.h>
43	#include <errno.h>
44	#include <string.h>
45
46	#define EOS_CHAR '\0'
47
48	error_t
49	argz_append (char *pargz, size_t pargz_len, const char *buf, size_t buf_len)
50	{
51	size_t argz_len;
52	char *argz;
53
54	assert (pargz);
55	assert (pargz_len);
56	assert ((pargz && pargz_len) \|\| (!pargz && !pargz_len));
57
58	/* If nothing needs to be appended, no more work is required. */
59	if (buf_len == 0)
60	return 0;
61
62	/* Ensure there is enough room to append BUF_LEN. */
63	argz_len = *pargz_len + buf_len;
64	argz = (char ) realloc (pargz, argz_len);
65	if (!argz)
66	return ENOMEM;
67
68	/* Copy characters from BUF after terminating '\0' in ARGZ. */
69	memcpy (argz + *pargz_len, buf, buf_len);
70
71	/* Assign new values. */
72	*pargz = argz;
73	*pargz_len = argz_len;
74
75	return 0;
76	}
77
78
79	error_t
80	argz_create_sep (const char str, int delim, char pargz, size_t pargz_len)
81	{
82	size_t argz_len;
83	char *argz = 0;
84
85	assert (str);
86	assert (pargz);
87	assert (pargz_len);
88
89	/* Make a copy of STR, but replacing each occurrence of
90	DELIM with '\0'. */
91	argz_len = 1+ strlen (str);
92	if (argz_len)
93	{
94	const char *p;
95	char *q;
96
97	argz = (char *) malloc (argz_len);
98	if (!argz)
99	return ENOMEM;
100
101	for (p = str, q = argz; *p != EOS_CHAR; ++p)
102	{
103	if (*p == delim)
104	{
105	/* Ignore leading delimiters, and fold consecutive
106	delimiters in STR into a single '\0' in ARGZ. */
107	if ((q > argz) && (q[-1] != EOS_CHAR))
108	*q++ = EOS_CHAR;
109	else
110	--argz_len;
111	}
112	else
113	q++ = p;
114	}
115	/* Copy terminating EOS_CHAR. */
116	q = p;
117	}
118
119	/* If ARGZ_LEN has shrunk to nothing, release ARGZ's memory. */
120	if (!argz_len)
121	argz = (free (argz), (char *) 0);
122
123	/* Assign new values. */
124	*pargz = argz;
125	*pargz_len = argz_len;
126
127	return 0;
128	}
129
130
131	error_t
132	argz_insert (char *pargz, size_t pargz_len, char before, const char entry)
133	{
134	assert (pargz);
135	assert (pargz_len);
136	assert (entry && *entry);
137
138	/* No BEFORE address indicates ENTRY should be inserted after the
139	current last element. */
140	if (!before)
141	return argz_append (pargz, pargz_len, entry, 1+ strlen (entry));
142
143	/* This probably indicates a programmer error, but to preserve
144	semantics, scan back to the start of an entry if BEFORE points
145	into the middle of it. */
146	while ((before > *pargz) && (before[-1] != EOS_CHAR))
147	--before;
148
149	{
150	size_t entry_len = 1+ strlen (entry);
151	size_t argz_len = *pargz_len + entry_len;
152	size_t offset = before - *pargz;
153	char argz = (char ) realloc (*pargz, argz_len);
154
155	if (!argz)
156	return ENOMEM;
157
158	/* Make BEFORE point to the equivalent offset in ARGZ that it
159	used to have in PARGZ incase realloc() moved the block. /
160	before = argz + offset;
161
162	/* Move the ARGZ entries starting at BEFORE up into the new
163	space at the end -- making room to copy ENTRY into the
164	resulting gap. */
165	memmove (before + entry_len, before, *pargz_len - offset);
166	memcpy (before, entry, entry_len);
167
168	/* Assign new values. */
169	*pargz = argz;
170	*pargz_len = argz_len;
171	}
172
173	return 0;
174	}
175
176
177	char *
178	argz_next (char argz, size_t argz_len, const char entry)
179	{
180	assert ((argz && argz_len) \|\| (!argz && !argz_len));
181
182	if (entry)
183	{
184	/* Either ARGZ/ARGZ_LEN is empty, or ENTRY points into an address
185	within the ARGZ vector. */
186	assert ((!argz && !argz_len)
187	\|\| ((argz <= entry) && (entry < (argz + argz_len))));
188
189	/* Move to the char immediately after the terminating
190	'\0' of ENTRY. */
191	entry = 1+ strchr (entry, EOS_CHAR);
192
193	/* Return either the new ENTRY, or else NULL if ARGZ is
194	exhausted. */
195	return (entry >= argz + argz_len) ? 0 : (char *) entry;
196	}
197	else
198	{
199	/* This should probably be flagged as a programmer error,
200	since starting an argz_next loop with the iterator set
201	to ARGZ is safer. To preserve semantics, handle the NULL
202	case by returning the start of ARGZ (if any). */
203	if (argz_len > 0)
204	return argz;
205	else
206	return 0;
207	}
208	}
209
210
211	void
212	argz_stringify (char *argz, size_t argz_len, int sep)
213	{
214	assert ((argz && argz_len) \|\| (!argz && !argz_len));
215
216	if (sep)
217	{
218	--argz_len; /* don't stringify the terminating EOS */
219	while (--argz_len > 0)
220	{
221	if (argz[argz_len] == EOS_CHAR)
222	argz[argz_len] = sep;
223	}
224	}
225	}
226