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comparison libiberty/concat.c @ 0:a06113de4d67

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author kent <kent@cr.ie.u-ryukyu.ac.jp>
date Fri, 17 Jul 2009 14:47:48 +0900
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1 /* Concatenate variable number of strings.
2 Copyright (C) 1991, 1994, 2001 Free Software Foundation, Inc.
3 Written by Fred Fish @ Cygnus Support
4
5 This file is part of the libiberty library.
6 Libiberty is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public
8 License as published by the Free Software Foundation; either
9 version 2 of the License, or (at your option) any later version.
10
11 Libiberty is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Library General Public License for more details.
15
16 You should have received a copy of the GNU Library General Public
17 License along with libiberty; see the file COPYING.LIB. If
18 not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
20
21
22 /*
23
24 @deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @dots{}, @code{NULL})
25
26 Concatenate zero or more of strings and return the result in freshly
27 @code{xmalloc}ed memory. Returns @code{NULL} if insufficient memory is
28 available. The argument list is terminated by the first @code{NULL}
29 pointer encountered. Pointers to empty strings are ignored.
30
31 @end deftypefn
32
33 NOTES
34
35 This function uses xmalloc() which is expected to be a front end
36 function to malloc() that deals with low memory situations. In
37 typical use, if malloc() returns NULL then xmalloc() diverts to an
38 error handler routine which never returns, and thus xmalloc will
39 never return a NULL pointer. If the client application wishes to
40 deal with low memory situations itself, it should supply an xmalloc
41 that just directly invokes malloc and blindly returns whatever
42 malloc returns.
43
44 */
45
46
47 #ifdef HAVE_CONFIG_H
48 #include "config.h"
49 #endif
50 #include "ansidecl.h"
51 #include "libiberty.h"
52 #include <sys/types.h> /* size_t */
53
54 #include <stdarg.h>
55
56 # if HAVE_STRING_H
57 # include <string.h>
58 # else
59 # if HAVE_STRINGS_H
60 # include <strings.h>
61 # endif
62 # endif
63
64 #if HAVE_STDLIB_H
65 #include <stdlib.h>
66 #endif
67
68 static inline unsigned long vconcat_length (const char *, va_list);
69 static inline unsigned long
70 vconcat_length (const char *first, va_list args)
71 {
72 unsigned long length = 0;
73 const char *arg;
74
75 for (arg = first; arg ; arg = va_arg (args, const char *))
76 length += strlen (arg);
77
78 return length;
79 }
80
81 static inline char *
82 vconcat_copy (char *dst, const char *first, va_list args)
83 {
84 char *end = dst;
85 const char *arg;
86
87 for (arg = first; arg ; arg = va_arg (args, const char *))
88 {
89 unsigned long length = strlen (arg);
90 memcpy (end, arg, length);
91 end += length;
92 }
93 *end = '\000';
94
95 return dst;
96 }
97
98 /* @undocumented concat_length */
99
100 unsigned long
101 concat_length (const char *first, ...)
102 {
103 unsigned long length;
104
105 VA_OPEN (args, first);
106 VA_FIXEDARG (args, const char *, first);
107 length = vconcat_length (first, args);
108 VA_CLOSE (args);
109
110 return length;
111 }
112
113 /* @undocumented concat_copy */
114
115 char *
116 concat_copy (char *dst, const char *first, ...)
117 {
118 char *save_dst;
119
120 VA_OPEN (args, first);
121 VA_FIXEDARG (args, char *, dst);
122 VA_FIXEDARG (args, const char *, first);
123 vconcat_copy (dst, first, args);
124 save_dst = dst; /* With K&R C, dst goes out of scope here. */
125 VA_CLOSE (args);
126
127 return save_dst;
128 }
129
130 #ifdef __cplusplus
131 extern "C" {
132 #endif /* __cplusplus */
133 char *libiberty_concat_ptr;
134 #ifdef __cplusplus
135 }
136 #endif /* __cplusplus */
137
138 /* @undocumented concat_copy2 */
139
140 char *
141 concat_copy2 (const char *first, ...)
142 {
143 VA_OPEN (args, first);
144 VA_FIXEDARG (args, const char *, first);
145 vconcat_copy (libiberty_concat_ptr, first, args);
146 VA_CLOSE (args);
147
148 return libiberty_concat_ptr;
149 }
150
151 char *
152 concat (const char *first, ...)
153 {
154 char *newstr;
155
156 /* First compute the size of the result and get sufficient memory. */
157 VA_OPEN (args, first);
158 VA_FIXEDARG (args, const char *, first);
159 newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
160 VA_CLOSE (args);
161
162 /* Now copy the individual pieces to the result string. */
163 VA_OPEN (args, first);
164 VA_FIXEDARG (args, const char *, first);
165 vconcat_copy (newstr, first, args);
166 VA_CLOSE (args);
167
168 return newstr;
169 }
170
171 /*
172
173 @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @dots{}, @code{NULL})
174
175 Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
176 is freed after the string is created. This is intended to be useful
177 when you're extending an existing string or building up a string in a
178 loop:
179
180 @example
181 str = reconcat (str, "pre-", str, NULL);
182 @end example
183
184 @end deftypefn
185
186 */
187
188 char *
189 reconcat (char *optr, const char *first, ...)
190 {
191 char *newstr;
192
193 /* First compute the size of the result and get sufficient memory. */
194 VA_OPEN (args, first);
195 VA_FIXEDARG (args, char *, optr);
196 VA_FIXEDARG (args, const char *, first);
197 newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
198 VA_CLOSE (args);
199
200 /* Now copy the individual pieces to the result string. */
201 VA_OPEN (args, first);
202 VA_FIXEDARG (args, char *, optr);
203 VA_FIXEDARG (args, const char *, first);
204 vconcat_copy (newstr, first, args);
205 if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */
206 free (optr);
207 VA_CLOSE (args);
208
209 return newstr;
210 }
211
212 #ifdef MAIN
213 #define NULLP (char *)0
214
215 /* Simple little test driver. */
216
217 #include <stdio.h>
218
219 int
220 main (void)
221 {
222 printf ("\"\" = \"%s\"\n", concat (NULLP));
223 printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
224 printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
225 printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
226 printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
227 printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
228 printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
229 return 0;
230 }
231
232 #endif