ircd-hybrid-8/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:	1156
Committed:	Tue Aug 9 20:29:20 2011 UTC (12 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	5903 byte(s)
Log Message:	- create ircd-hybrid-8 "branch"
#	User	Rev	Content
1	michael	945	/* 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