Commit | Line | Data |
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252b5132 | 1 | /* Concatenate variable number of strings. |
d42dae6c | 2 | Copyright (C) 1991, 1994, 2001 Free Software Foundation, Inc. |
252b5132 RH |
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 | |
979c05d3 NC |
18 | not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
19 | Boston, MA 02110-1301, USA. */ | |
252b5132 RH |
20 | |
21 | ||
22 | /* | |
23 | ||
5d852400 | 24 | @deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @dots{}, @code{NULL}) |
252b5132 | 25 | |
ba19b94f | 26 | Concatenate zero or more of strings and return the result in freshly |
5d852400 | 27 | @code{xmalloc}ed memory. Returns @code{NULL} if insufficient memory is |
ba19b94f DD |
28 | available. The argument list is terminated by the first @code{NULL} |
29 | pointer encountered. Pointers to empty strings are ignored. | |
252b5132 | 30 | |
ba19b94f | 31 | @end deftypefn |
252b5132 RH |
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. | |
ba19b94f | 43 | |
252b5132 RH |
44 | */ |
45 | ||
46 | ||
65a4f13c DD |
47 | #ifdef HAVE_CONFIG_H |
48 | #include "config.h" | |
49 | #endif | |
252b5132 RH |
50 | #include "ansidecl.h" |
51 | #include "libiberty.h" | |
926150e2 | 52 | #include <sys/types.h> /* size_t */ |
252b5132 | 53 | |
252b5132 | 54 | #include <stdarg.h> |
252b5132 | 55 | |
d42dae6c DD |
56 | # if HAVE_STRING_H |
57 | # include <string.h> | |
58 | # else | |
59 | # if HAVE_STRINGS_H | |
60 | # include <strings.h> | |
61 | # endif | |
62 | # endif | |
252b5132 | 63 | |
916aaa12 DD |
64 | #if HAVE_STDLIB_H |
65 | #include <stdlib.h> | |
66 | #endif | |
67 | ||
9334f9c6 | 68 | static inline unsigned long vconcat_length (const char *, va_list); |
54c20242 | 69 | static inline unsigned long |
9334f9c6 | 70 | vconcat_length (const char *first, va_list args) |
252b5132 | 71 | { |
54c20242 DD |
72 | unsigned long length = 0; |
73 | const char *arg; | |
252b5132 | 74 | |
d42dae6c DD |
75 | for (arg = first; arg ; arg = va_arg (args, const char *)) |
76 | length += strlen (arg); | |
77 | ||
54c20242 DD |
78 | return length; |
79 | } | |
252b5132 | 80 | |
54c20242 | 81 | static inline char * |
9334f9c6 | 82 | vconcat_copy (char *dst, const char *first, va_list args) |
54c20242 DD |
83 | { |
84 | char *end = dst; | |
85 | const char *arg; | |
d42dae6c | 86 | |
d42dae6c DD |
87 | for (arg = first; arg ; arg = va_arg (args, const char *)) |
88 | { | |
54c20242 | 89 | unsigned long length = strlen (arg); |
d42dae6c DD |
90 | memcpy (end, arg, length); |
91 | end += length; | |
252b5132 | 92 | } |
d42dae6c | 93 | *end = '\000'; |
54c20242 DD |
94 | |
95 | return dst; | |
96 | } | |
97 | ||
ba19b94f DD |
98 | /* @undocumented concat_length */ |
99 | ||
54c20242 | 100 | unsigned long |
9334f9c6 | 101 | concat_length (const char *first, ...) |
54c20242 DD |
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 | ||
ba19b94f DD |
113 | /* @undocumented concat_copy */ |
114 | ||
54c20242 | 115 | char * |
9334f9c6 | 116 | concat_copy (char *dst, const char *first, ...) |
54c20242 DD |
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 | ||
abf6a75b DD |
130 | #ifdef __cplusplus |
131 | extern "C" { | |
132 | #endif /* __cplusplus */ | |
54c20242 | 133 | char *libiberty_concat_ptr; |
abf6a75b DD |
134 | #ifdef __cplusplus |
135 | } | |
136 | #endif /* __cplusplus */ | |
54c20242 | 137 | |
ba19b94f DD |
138 | /* @undocumented concat_copy2 */ |
139 | ||
54c20242 | 140 | char * |
9334f9c6 | 141 | concat_copy2 (const char *first, ...) |
54c20242 DD |
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 * | |
9334f9c6 | 152 | concat (const char *first, ...) |
54c20242 DD |
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); | |
abf6a75b | 159 | newstr = XNEWVEC (char, vconcat_length (first, args) + 1); |
54c20242 DD |
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); | |
8a423cb3 | 166 | VA_CLOSE (args); |
252b5132 | 167 | |
d42dae6c | 168 | return newstr; |
252b5132 RH |
169 | } |
170 | ||
ba19b94f DD |
171 | /* |
172 | ||
5d852400 | 173 | @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @dots{}, @code{NULL}) |
ba19b94f DD |
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 | ||
99ee3a8f | 188 | char * |
9334f9c6 | 189 | reconcat (char *optr, const char *first, ...) |
99ee3a8f DD |
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); | |
abf6a75b | 197 | newstr = XNEWVEC (char, vconcat_length (first, args) + 1); |
99ee3a8f DD |
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); | |
66c94e19 | 205 | if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */ |
99ee3a8f | 206 | free (optr); |
66c94e19 | 207 | VA_CLOSE (args); |
99ee3a8f DD |
208 | |
209 | return newstr; | |
210 | } | |
211 | ||
252b5132 | 212 | #ifdef MAIN |
d42dae6c | 213 | #define NULLP (char *)0 |
252b5132 RH |
214 | |
215 | /* Simple little test driver. */ | |
216 | ||
217 | #include <stdio.h> | |
218 | ||
219 | int | |
9334f9c6 | 220 | main (void) |
252b5132 RH |
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 |