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 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., 51 Franklin Street - Fifth Floor, 19 Boston, 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 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. 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 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) 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 70 static inline char * 71 vconcat_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 89 unsigned long 90 concat_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 */ 103 104 char * 105 concat_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 119 extern "C" { 120 #endif /* __cplusplus */ 121 char *libiberty_concat_ptr; 122 #ifdef __cplusplus 123 } 124 #endif /* __cplusplus */ 125 126 /* @undocumented concat_copy2 */ 127 128 char * 129 concat_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 } 138 139 char * 140 concat (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}) 162 163 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: 167 168 @example 169 str = reconcat (str, "pre-", str, NULL); 170 @end example 171 172 @end deftypefn 173 174 */ 175 176 char * 177 reconcat (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> 203 204 int 205 main (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
