gcc/
[official-gcc.git] / libiberty / concat.c
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1 /* Concatenate variable number of strings.
2 Copyright (C) 1991, 1994, 2001, 2011, 2013 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., 51 Franklin Street - Fifth Floor,
19 Boston, MA 02110-1301, USA. */
24 @deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @
25 @dots{}, @code{NULL})
27 Concatenate zero or more of strings and return the result in freshly
28 @code{xmalloc}ed memory. The argument list is terminated by the first
29 @code{NULL} pointer encountered. Pointers to empty strings are ignored.
31 @end deftypefn
36 #ifdef HAVE_CONFIG_H
37 #include "config.h"
38 #endif
39 #include "ansidecl.h"
40 #include "libiberty.h"
41 #include <sys/types.h> /* size_t */
43 #include <stdarg.h>
45 # if HAVE_STRING_H
46 # include <string.h>
47 # else
48 # if HAVE_STRINGS_H
49 # include <strings.h>
50 # endif
51 # endif
53 #if HAVE_STDLIB_H
54 #include <stdlib.h>
55 #endif
57 static inline unsigned long vconcat_length (const char *, va_list);
58 static inline unsigned long
59 vconcat_length (const char *first, va_list args)
61 unsigned long length = 0;
62 const char *arg;
64 for (arg = first; arg ; arg = va_arg (args, const char *))
65 length += strlen (arg);
67 return length;
70 static inline char *
71 vconcat_copy (char *dst, const char *first, va_list args)
73 char *end = dst;
74 const char *arg;
76 for (arg = first; arg ; arg = va_arg (args, const char *))
78 unsigned long length = strlen (arg);
79 memcpy (end, arg, length);
80 end += length;
82 *end = '\000';
84 return dst;
87 /* @undocumented concat_length */
89 unsigned long
90 concat_length (const char *first, ...)
92 unsigned long length;
93 va_list args;
95 va_start (args, first);
96 length = vconcat_length (first, args);
97 va_end (args);
99 return length;
102 /* @undocumented concat_copy */
104 char *
105 concat_copy (char *dst, const char *first, ...)
107 char *save_dst;
108 va_list args;
110 va_start (args, first);
111 vconcat_copy (dst, first, args);
112 save_dst = dst; /* With K&R C, dst goes out of scope here. */
113 va_end (args);
115 return save_dst;
118 #ifdef __cplusplus
119 extern "C" {
120 #endif /* __cplusplus */
121 char *libiberty_concat_ptr;
122 #ifdef __cplusplus
124 #endif /* __cplusplus */
126 /* @undocumented concat_copy2 */
128 char *
129 concat_copy2 (const char *first, ...)
131 va_list args;
132 va_start (args, first);
133 vconcat_copy (libiberty_concat_ptr, first, args);
134 va_end (args);
136 return libiberty_concat_ptr;
139 char *
140 concat (const char *first, ...)
142 char *newstr;
143 va_list args;
145 /* First compute the size of the result and get sufficient memory. */
146 va_start (args, first);
147 newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
148 va_end (args);
150 /* Now copy the individual pieces to the result string. */
151 va_start (args, first);
152 vconcat_copy (newstr, first, args);
153 va_end (args);
155 return newstr;
160 @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @
161 @dots{}, @code{NULL})
163 Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
164 is freed after the string is created. This is intended to be useful
165 when you're extending an existing string or building up a string in a
166 loop:
168 @example
169 str = reconcat (str, "pre-", str, NULL);
170 @end example
172 @end deftypefn
176 char *
177 reconcat (char *optr, const char *first, ...)
179 char *newstr;
180 va_list args;
182 /* First compute the size of the result and get sufficient memory. */
183 va_start (args, first);
184 newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
185 va_end (args);
187 /* Now copy the individual pieces to the result string. */
188 va_start (args, first);
189 vconcat_copy (newstr, first, args);
190 if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */
191 free (optr);
192 va_end (args);
194 return newstr;
197 #ifdef MAIN
198 #define NULLP (char *)0
200 /* Simple little test driver. */
202 #include <stdio.h>
205 main (void)
207 printf ("\"\" = \"%s\"\n", concat (NULLP));
208 printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
209 printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
210 printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
211 printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
212 printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
213 printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
214 return 0;
217 #endif