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 4 5This file is part of the libiberty library. 6Libiberty is free software; you can redistribute it and/or 7modify it under the terms of the GNU Library General Public 8License as published by the Free Software Foundation; either 9version 2 of the License, or (at your option) any later version. 10 11Libiberty is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14Library General Public License for more details. 15 16You should have received a copy of the GNU Library General Public 17License along with libiberty; see the file COPYING.LIB. If 18not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 19Boston, MA 02110-1301, USA. */ 20 21 22/* 23 24@deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @ 25 @dots{}, @code{NULL}) 26 27Concatenate 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. 30 31@end deftypefn 32 33*/ 34 35 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 */ 42 43#include <stdarg.h> 44 45# if HAVE_STRING_H 46# include <string.h> 47# else 48# if HAVE_STRINGS_H 49# include <strings.h> 50# endif 51# endif 52 53#if HAVE_STDLIB_H 54#include <stdlib.h> 55#endif 56 57static inline unsigned long vconcat_length (const char *, va_list); 58static inline unsigned long 59vconcat_length (const char *first, va_list args) 60{ 61 unsigned long length = 0; 62 const char *arg; 63 64 for (arg = first; arg ; arg = va_arg (args, const char *)) 65 length += strlen (arg); 66 67 return length; 68} 69 70static inline char * 71vconcat_copy (char *dst, const char *first, va_list args) 72{ 73 char *end = dst; 74 const char *arg; 75 76 for (arg = first; arg ; arg = va_arg (args, const char *)) 77 { 78 unsigned long length = strlen (arg); 79 memcpy (end, arg, length); 80 end += length; 81 } 82 *end = '\000'; 83 84 return dst; 85} 86 87/* @undocumented concat_length */ 88 89unsigned long 90concat_length (const char *first, ...) 91{ 92 unsigned long length; 93 va_list args; 94 95 va_start (args, first); 96 length = vconcat_length (first, args); 97 va_end (args); 98 99 return length; 100} 101 102/* @undocumented concat_copy */ 103 104char * 105concat_copy (char *dst, const char *first, ...) 106{ 107 char *save_dst; 108 va_list args; 109 110 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); 114 115 return save_dst; 116} 117 118#ifdef __cplusplus 119extern "C" { 120#endif /* __cplusplus */ 121char *libiberty_concat_ptr; 122#ifdef __cplusplus 123} 124#endif /* __cplusplus */ 125 126/* @undocumented concat_copy2 */ 127 128char * 129concat_copy2 (const char *first, ...) 130{ 131 va_list args; 132 va_start (args, first); 133 vconcat_copy (libiberty_concat_ptr, first, args); 134 va_end (args); 135 136 return libiberty_concat_ptr; 137} 138 139char * 140concat (const char *first, ...) 141{ 142 char *newstr; 143 va_list args; 144 145 /* 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); 149 150 /* Now copy the individual pieces to the result string. */ 151 va_start (args, first); 152 vconcat_copy (newstr, first, args); 153 va_end (args); 154 155 return newstr; 156} 157 158/* 159 160@deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @ 161 @dots{}, @code{NULL}) 162 163Same as @code{concat}, except that if @var{optr} is not @code{NULL} it 164is freed after the string is created. This is intended to be useful 165when you're extending an existing string or building up a string in a 166loop: 167 168@example 169 str = reconcat (str, "pre-", str, NULL); 170@end example 171 172@end deftypefn 173 174*/ 175 176char * 177reconcat (char *optr, const char *first, ...) 178{ 179 char *newstr; 180 va_list args; 181 182 /* 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); 186 187 /* 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); 193 194 return newstr; 195} 196 197#ifdef MAIN 198#define NULLP (char *)0 199 200/* Simple little test driver. */ 201 202#include <stdio.h> 203 204int 205main (void) 206{ 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; 215} 216 217#endif 218