source: rtems-tools/rtemstoolkit/libiberty/concat.c @ 87e0e76

4.104.11
Last change on this file since 87e0e76 was 87e0e76, checked in by Chris Johns <chrisj@…>, on Sep 13, 2014 at 2:09:16 AM

Refactor code into the RTEMS Toolkit.

  • Property mode set to 100644
File size: 5.8 KB
Line 
1/* Concatenate variable number of strings.
2   Copyright (C) 1991, 1994, 2001, 2011 Free Software Foundation, Inc.
3   Written by Fred Fish @ Cygnus Support
4
5This file is part of the libiberty library.
6Libiberty is free software; you can redistribute it and/or
7modify it under the terms of the GNU Library General Public
8License as published by the Free Software Foundation; either
9version 2 of the License, or (at your option) any later version.
10
11Libiberty is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14Library General Public License for more details.
15
16You should have received a copy of the GNU Library General Public
17License along with libiberty; see the file COPYING.LIB.  If
18not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
19Boston, MA 02110-1301, USA.  */
20
21
22/*
23
24@deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @
25  @dots{}, @code{NULL})
26
27Concatenate zero or more of strings and return the result in freshly
28@code{xmalloc}ed memory.  Returns @code{NULL} if insufficient memory is
29available.  The argument list is terminated by the first @code{NULL}
30pointer encountered.  Pointers to empty strings are ignored.
31
32@end deftypefn
33
34NOTES
35
36        This function uses xmalloc() which is expected to be a front end
37        function to malloc() that deals with low memory situations.  In
38        typical use, if malloc() returns NULL then xmalloc() diverts to an
39        error handler routine which never returns, and thus xmalloc will
40        never return a NULL pointer.  If the client application wishes to
41        deal with low memory situations itself, it should supply an xmalloc
42        that just directly invokes malloc and blindly returns whatever
43        malloc returns.
44
45*/
46
47
48#ifdef HAVE_CONFIG_H
49#include "config.h"
50#endif
51#include "ansidecl.h"
52#include "libiberty.h"
53#include <sys/types.h>          /* size_t */
54
55#include <stdarg.h>
56
57# if HAVE_STRING_H
58#  include <string.h>
59# else
60#  if HAVE_STRINGS_H
61#   include <strings.h>
62#  endif
63# endif
64
65#if HAVE_STDLIB_H
66#include <stdlib.h>
67#endif
68
69static inline unsigned long vconcat_length (const char *, va_list);
70static inline unsigned long
71vconcat_length (const char *first, va_list args)
72{
73  unsigned long length = 0;
74  const char *arg;
75
76  for (arg = first; arg ; arg = va_arg (args, const char *))
77    length += strlen (arg);
78
79  return length;
80}
81
82static inline char *
83vconcat_copy (char *dst, const char *first, va_list args)
84{
85  char *end = dst;
86  const char *arg;
87
88  for (arg = first; arg ; arg = va_arg (args, const char *))
89    {
90      unsigned long length = strlen (arg);
91      memcpy (end, arg, length);
92      end += length;
93    }
94  *end = '\000';
95
96  return dst;
97}
98
99/* @undocumented concat_length */
100
101unsigned long
102concat_length (const char *first, ...)
103{
104  unsigned long length;
105
106  VA_OPEN (args, first);
107  VA_FIXEDARG (args, const char *, first);
108  length = vconcat_length (first, args);
109  VA_CLOSE (args);
110
111  return length;
112}
113
114/* @undocumented concat_copy */
115
116char *
117concat_copy (char *dst, const char *first, ...)
118{
119  char *save_dst;
120
121  VA_OPEN (args, first);
122  VA_FIXEDARG (args, char *, dst);
123  VA_FIXEDARG (args, const char *, first);
124  vconcat_copy (dst, first, args);
125  save_dst = dst; /* With K&R C, dst goes out of scope here.  */
126  VA_CLOSE (args);
127
128  return save_dst;
129}
130
131#ifdef __cplusplus
132extern "C" {
133#endif /* __cplusplus */
134char *libiberty_concat_ptr;
135#ifdef __cplusplus
136}
137#endif /* __cplusplus */
138
139/* @undocumented concat_copy2 */
140
141char *
142concat_copy2 (const char *first, ...)
143{
144  VA_OPEN (args, first);
145  VA_FIXEDARG (args, const char *, first);
146  vconcat_copy (libiberty_concat_ptr, first, args);
147  VA_CLOSE (args);
148
149  return libiberty_concat_ptr;
150}
151
152char *
153concat (const char *first, ...)
154{
155  char *newstr;
156
157  /* First compute the size of the result and get sufficient memory.  */
158  VA_OPEN (args, first);
159  VA_FIXEDARG (args, const char *, first);
160  newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
161  VA_CLOSE (args);
162
163  /* Now copy the individual pieces to the result string. */
164  VA_OPEN (args, first);
165  VA_FIXEDARG (args, const char *, first);
166  vconcat_copy (newstr, first, args);
167  VA_CLOSE (args);
168
169  return newstr;
170}
171
172/*
173
174@deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @
175  @dots{}, @code{NULL})
176
177Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
178is freed after the string is created.  This is intended to be useful
179when you're extending an existing string or building up a string in a
180loop:
181
182@example
183  str = reconcat (str, "pre-", str, NULL);
184@end example
185
186@end deftypefn
187
188*/
189
190char *
191reconcat (char *optr, const char *first, ...)
192{
193  char *newstr;
194
195  /* First compute the size of the result and get sufficient memory.  */
196  VA_OPEN (args, first);
197  VA_FIXEDARG (args, char *, optr);
198  VA_FIXEDARG (args, const char *, first);
199  newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
200  VA_CLOSE (args);
201
202  /* Now copy the individual pieces to the result string. */
203  VA_OPEN (args, first);
204  VA_FIXEDARG (args, char *, optr);
205  VA_FIXEDARG (args, const char *, first);
206  vconcat_copy (newstr, first, args);
207  if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C.  */
208    free (optr);
209  VA_CLOSE (args);
210
211  return newstr;
212}
213
214#ifdef MAIN
215#define NULLP (char *)0
216
217/* Simple little test driver. */
218
219#include <stdio.h>
220
221int
222main (void)
223{
224  printf ("\"\" = \"%s\"\n", concat (NULLP));
225  printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
226  printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
227  printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
228  printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
229  printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
230  printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
231  return 0;
232}
233
234#endif
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