1 /* Concatenate variable number of strings.
2 Copyright (C) 1991, 1994, 2001 Free Software Foundation, Inc.
3 Written by Fred Fish @ Cygnus Support
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.
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.
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., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
26 concat -- concatenate a variable number of strings
32 char *concat (s1, s2, s3, ..., NULL)
36 Concatenate a variable number of strings and return the result
37 in freshly malloc'd memory.
39 Returns NULL if insufficient memory is available. The argument
40 list is terminated by the first NULL pointer encountered. Pointers
41 to empty strings are ignored.
45 This function uses xmalloc() which is expected to be a front end
46 function to malloc() that deals with low memory situations. In
47 typical use, if malloc() returns NULL then xmalloc() diverts to an
48 error handler routine which never returns, and thus xmalloc will
49 never return a NULL pointer. If the client application wishes to
50 deal with low memory situations itself, it should supply an xmalloc
51 that just directly invokes malloc and blindly returns whatever
60 #include "libiberty.h"
61 #include <sys/types.h> /* size_t */
63 #ifdef ANSI_PROTOTYPES
81 static inline unsigned long vconcat_length PARAMS ((const char *, va_list));
82 static inline unsigned long
83 vconcat_length (first, args)
87 unsigned long length = 0;
90 for (arg = first; arg ; arg = va_arg (args, const char *))
91 length += strlen (arg);
96 static inline char *vconcat_copy PARAMS ((char *, const char *, va_list));
98 vconcat_copy (dst, first, args)
106 for (arg = first; arg ; arg = va_arg (args, const char *))
108 unsigned long length = strlen (arg);
109 memcpy (end, arg, length);
118 concat_length VPARAMS ((const char *first, ...))
120 unsigned long length;
122 VA_OPEN (args, first);
123 VA_FIXEDARG (args, const char *, first);
124 length = vconcat_length (first, args);
131 concat_copy VPARAMS ((char *dst, const char *first, ...))
135 VA_OPEN (args, first);
136 VA_FIXEDARG (args, char *, dst);
137 VA_FIXEDARG (args, const char *, first);
138 vconcat_copy (dst, first, args);
139 save_dst = dst; /* With K&R C, dst goes out of scope here. */
145 char *libiberty_concat_ptr;
148 concat_copy2 VPARAMS ((const char *first, ...))
150 VA_OPEN (args, first);
151 VA_FIXEDARG (args, const char *, first);
152 vconcat_copy (libiberty_concat_ptr, first, args);
155 return libiberty_concat_ptr;
159 concat VPARAMS ((const char *first, ...))
163 /* First compute the size of the result and get sufficient memory. */
164 VA_OPEN (args, first);
165 VA_FIXEDARG (args, const char *, first);
166 newstr = (char *) xmalloc (vconcat_length (first, args) + 1);
169 /* Now copy the individual pieces to the result string. */
170 VA_OPEN (args, first);
171 VA_FIXEDARG (args, const char *, first);
172 vconcat_copy (newstr, first, args);
179 reconcat VPARAMS ((char *optr, const char *first, ...))
183 /* First compute the size of the result and get sufficient memory. */
184 VA_OPEN (args, first);
185 VA_FIXEDARG (args, char *, optr);
186 VA_FIXEDARG (args, const char *, first);
187 newstr = (char *) xmalloc (vconcat_length (first, args) + 1);
190 /* Now copy the individual pieces to the result string. */
191 VA_OPEN (args, first);
192 VA_FIXEDARG (args, char *, optr);
193 VA_FIXEDARG (args, const char *, first);
194 vconcat_copy (newstr, first, args);
195 if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */
203 #define NULLP (char *)0
205 /* Simple little test driver. */
212 printf ("\"\" = \"%s\"\n", concat (NULLP));
213 printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
214 printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
215 printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
216 printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
217 printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
218 printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));