| 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., 59 Temple Place - Suite 330, |
| 19 | Boston, MA 02111-1307, 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 | char *libiberty_concat_ptr; |
| 131 | |
| 132 | /* @undocumented concat_copy2 */ |
| 133 | |
| 134 | char * |
| 135 | concat_copy2 (const char *first, ...) |
| 136 | { |
| 137 | VA_OPEN (args, first); |
| 138 | VA_FIXEDARG (args, const char *, first); |
| 139 | vconcat_copy (libiberty_concat_ptr, first, args); |
| 140 | VA_CLOSE (args); |
| 141 | |
| 142 | return libiberty_concat_ptr; |
| 143 | } |
| 144 | |
| 145 | char * |
| 146 | concat (const char *first, ...) |
| 147 | { |
| 148 | char *newstr; |
| 149 | |
| 150 | /* First compute the size of the result and get sufficient memory. */ |
| 151 | VA_OPEN (args, first); |
| 152 | VA_FIXEDARG (args, const char *, first); |
| 153 | newstr = (char *) xmalloc (vconcat_length (first, args) + 1); |
| 154 | VA_CLOSE (args); |
| 155 | |
| 156 | /* Now copy the individual pieces to the result string. */ |
| 157 | VA_OPEN (args, first); |
| 158 | VA_FIXEDARG (args, const char *, first); |
| 159 | vconcat_copy (newstr, first, args); |
| 160 | VA_CLOSE (args); |
| 161 | |
| 162 | return newstr; |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | |
| 167 | @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @dots{}, @code{NULL}) |
| 168 | |
| 169 | Same as @code{concat}, except that if @var{optr} is not @code{NULL} it |
| 170 | is freed after the string is created. This is intended to be useful |
| 171 | when you're extending an existing string or building up a string in a |
| 172 | loop: |
| 173 | |
| 174 | @example |
| 175 | str = reconcat (str, "pre-", str, NULL); |
| 176 | @end example |
| 177 | |
| 178 | @end deftypefn |
| 179 | |
| 180 | */ |
| 181 | |
| 182 | char * |
| 183 | reconcat (char *optr, const char *first, ...) |
| 184 | { |
| 185 | char *newstr; |
| 186 | |
| 187 | /* First compute the size of the result and get sufficient memory. */ |
| 188 | VA_OPEN (args, first); |
| 189 | VA_FIXEDARG (args, char *, optr); |
| 190 | VA_FIXEDARG (args, const char *, first); |
| 191 | newstr = (char *) xmalloc (vconcat_length (first, args) + 1); |
| 192 | VA_CLOSE (args); |
| 193 | |
| 194 | /* Now copy the individual pieces to the result string. */ |
| 195 | VA_OPEN (args, first); |
| 196 | VA_FIXEDARG (args, char *, optr); |
| 197 | VA_FIXEDARG (args, const char *, first); |
| 198 | vconcat_copy (newstr, first, args); |
| 199 | if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */ |
| 200 | free (optr); |
| 201 | VA_CLOSE (args); |
| 202 | |
| 203 | return newstr; |
| 204 | } |
| 205 | |
| 206 | #ifdef MAIN |
| 207 | #define NULLP (char *)0 |
| 208 | |
| 209 | /* Simple little test driver. */ |
| 210 | |
| 211 | #include <stdio.h> |
| 212 | |
| 213 | int |
| 214 | main (void) |
| 215 | { |
| 216 | printf ("\"\" = \"%s\"\n", concat (NULLP)); |
| 217 | printf ("\"a\" = \"%s\"\n", concat ("a", NULLP)); |
| 218 | printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP)); |
| 219 | printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP)); |
| 220 | printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP)); |
| 221 | printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP)); |
| 222 | printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP)); |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | #endif |