1 /* Concatenate variable number of strings.
2 Copyright (C) 1991, 1994 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
57 #include "libiberty.h"
59 #ifdef ANSI_PROTOTYPES
67 extern size_t strlen (const char *s
);
72 #define NULLP (char *)0
75 #ifdef ANSI_PROTOTYPES
77 concat (const char *first
, ...)
85 register char *newstr
;
87 register const char *arg
;
89 #ifndef ANSI_PROTOTYPES
93 /* First compute the size of the result and get sufficient memory. */
95 #ifdef ANSI_PROTOTYPES
96 va_start (args
, first
);
99 first
= va_arg (args
, const char *);
106 length
= strlen (first
);
107 while ((arg
= va_arg (args
, const char *)) != NULLP
)
109 length
+= strlen (arg
);
112 newstr
= (char *) xmalloc (length
+ 1);
115 /* Now copy the individual pieces to the result string. */
119 #ifdef ANSI_PROTOTYPES
120 va_start (args
, first
);
123 first
= va_arg (args
, const char *);
133 while ((arg
= va_arg (args
, const char *)) != NULLP
)
150 /* Simple little test driver. */
157 printf ("\"\" = \"%s\"\n", concat (NULLP
));
158 printf ("\"a\" = \"%s\"\n", concat ("a", NULLP
));
159 printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP
));
160 printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP
));
161 printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP
));
162 printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP
));
163 printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP
));
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