| 1 | /* Concatenate variable number of strings. |
| 2 | Copyright (C) 1991, 1994 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 | NAME |
| 25 | |
| 26 | concat -- concatenate a variable number of strings |
| 27 | |
| 28 | SYNOPSIS |
| 29 | |
| 30 | #include <varargs.h> |
| 31 | |
| 32 | char *concat (s1, s2, s3, ..., NULL) |
| 33 | |
| 34 | DESCRIPTION |
| 35 | |
| 36 | Concatenate a variable number of strings and return the result |
| 37 | in freshly malloc'd memory. |
| 38 | |
| 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. |
| 42 | |
| 43 | NOTES |
| 44 | |
| 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 |
| 52 | malloc returns. |
| 53 | */ |
| 54 | |
| 55 | |
| 56 | #include "ansidecl.h" |
| 57 | #include "libiberty.h" |
| 58 | |
| 59 | #ifdef ANSI_PROTOTYPES |
| 60 | #include <stdarg.h> |
| 61 | #else |
| 62 | #include <varargs.h> |
| 63 | #endif |
| 64 | |
| 65 | #ifdef __STDC__ |
| 66 | #include <stddef.h> |
| 67 | extern size_t strlen (const char *s); |
| 68 | #else |
| 69 | extern int strlen (); |
| 70 | #endif |
| 71 | |
| 72 | #define NULLP (char *)0 |
| 73 | |
| 74 | /* VARARGS */ |
| 75 | #ifdef ANSI_PROTOTYPES |
| 76 | char * |
| 77 | concat (const char *first, ...) |
| 78 | #else |
| 79 | char * |
| 80 | concat (va_alist) |
| 81 | va_dcl |
| 82 | #endif |
| 83 | { |
| 84 | register int length; |
| 85 | register char *newstr; |
| 86 | register char *end; |
| 87 | register const char *arg; |
| 88 | va_list args; |
| 89 | #ifndef ANSI_PROTOTYPES |
| 90 | const char *first; |
| 91 | #endif |
| 92 | |
| 93 | /* First compute the size of the result and get sufficient memory. */ |
| 94 | |
| 95 | #ifdef ANSI_PROTOTYPES |
| 96 | va_start (args, first); |
| 97 | #else |
| 98 | va_start (args); |
| 99 | first = va_arg (args, const char *); |
| 100 | #endif |
| 101 | |
| 102 | if (first == NULLP) |
| 103 | length = 0; |
| 104 | else |
| 105 | { |
| 106 | length = strlen (first); |
| 107 | while ((arg = va_arg (args, const char *)) != NULLP) |
| 108 | { |
| 109 | length += strlen (arg); |
| 110 | } |
| 111 | } |
| 112 | newstr = (char *) xmalloc (length + 1); |
| 113 | va_end (args); |
| 114 | |
| 115 | /* Now copy the individual pieces to the result string. */ |
| 116 | |
| 117 | if (newstr != NULLP) |
| 118 | { |
| 119 | #ifdef ANSI_PROTOTYPES |
| 120 | va_start (args, first); |
| 121 | #else |
| 122 | va_start (args); |
| 123 | first = va_arg (args, const char *); |
| 124 | #endif |
| 125 | end = newstr; |
| 126 | if (first != NULLP) |
| 127 | { |
| 128 | arg = first; |
| 129 | while (*arg) |
| 130 | { |
| 131 | *end++ = *arg++; |
| 132 | } |
| 133 | while ((arg = va_arg (args, const char *)) != NULLP) |
| 134 | { |
| 135 | while (*arg) |
| 136 | { |
| 137 | *end++ = *arg++; |
| 138 | } |
| 139 | } |
| 140 | } |
| 141 | *end = '\000'; |
| 142 | va_end (args); |
| 143 | } |
| 144 | |
| 145 | return (newstr); |
| 146 | } |
| 147 | |
| 148 | #ifdef MAIN |
| 149 | |
| 150 | /* Simple little test driver. */ |
| 151 | |
| 152 | #include <stdio.h> |
| 153 | |
| 154 | int |
| 155 | main () |
| 156 | { |
| 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)); |
| 164 | return 0; |
| 165 | } |
| 166 | |
| 167 | #endif |