1 /* Concatenate variable number of strings. 2 Copyright (C) 1991, 1994, 2001, 2011 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. Returns @code{NULL} if insufficient memory is 29 available. The argument list is terminated by the first @code{NULL} 30 pointer encountered. Pointers to empty strings are ignored. 31 32 @end deftypefn 33 34 NOTES 35 36 This function uses xmalloc() which is expected to be a front end 37 function to malloc() that deals with low memory situations. In 38 typical use, if malloc() returns NULL then xmalloc() diverts to an 39 error handler routine which never returns, and thus xmalloc will 40 never return a NULL pointer. If the client application wishes to 41 deal with low memory situations itself, it should supply an xmalloc 42 that just directly invokes malloc and blindly returns whatever 43 malloc returns. 44 45 */ 46 47 48 #ifdef HAVE_CONFIG_H 49 #include "config.h" 50 #endif 51 #include "ansidecl.h" 52 #include "libiberty.h" 53 #include <sys/types.h> /* size_t */ 54 55 #include <stdarg.h> 56 57 # if HAVE_STRING_H 58 # include <string.h> 59 # else 60 # if HAVE_STRINGS_H 61 # include <strings.h> 62 # endif 63 # endif 64 65 #if HAVE_STDLIB_H 66 #include <stdlib.h> 67 #endif 68 69 static inline unsigned long vconcat_length (const char *, va_list); 70 static inline unsigned long 71 vconcat_length (const char *first, va_list args) 72 { 73 unsigned long length = 0; 74 const char *arg; 75 76 for (arg = first; arg ; arg = va_arg (args, const char *)) 77 length += strlen (arg); 78 79 return length; 80 } 81 82 static inline char * 83 vconcat_copy (char *dst, const char *first, va_list args) 84 { 85 char *end = dst; 86 const char *arg; 87 88 for (arg = first; arg ; arg = va_arg (args, const char *)) 89 { 90 unsigned long length = strlen (arg); 91 memcpy (end, arg, length); 92 end += length; 93 } 94 *end = '\000'; 95 96 return dst; 97 } 98 99 /* @undocumented concat_length */ 100 101 unsigned long 102 concat_length (const char *first, ...) 103 { 104 unsigned long length; 105 106 VA_OPEN (args, first); 107 VA_FIXEDARG (args, const char *, first); 108 length = vconcat_length (first, args); 109 VA_CLOSE (args); 110 111 return length; 112 } 113 114 /* @undocumented concat_copy */ 115 116 char * 117 concat_copy (char *dst, const char *first, ...) 118 { 119 char *save_dst; 120 121 VA_OPEN (args, first); 122 VA_FIXEDARG (args, char *, dst); 123 VA_FIXEDARG (args, const char *, first); 124 vconcat_copy (dst, first, args); 125 save_dst = dst; /* With K&R C, dst goes out of scope here. */ 126 VA_CLOSE (args); 127 128 return save_dst; 129 } 130 131 #ifdef __cplusplus 132 extern "C" { 133 #endif /* __cplusplus */ 134 char *libiberty_concat_ptr; 135 #ifdef __cplusplus 136 } 137 #endif /* __cplusplus */ 138 139 /* @undocumented concat_copy2 */ 140 141 char * 142 concat_copy2 (const char *first, ...) 143 { 144 VA_OPEN (args, first); 145 VA_FIXEDARG (args, const char *, first); 146 vconcat_copy (libiberty_concat_ptr, first, args); 147 VA_CLOSE (args); 148 149 return libiberty_concat_ptr; 150 } 151 152 char * 153 concat (const char *first, ...) 154 { 155 char *newstr; 156 157 /* First compute the size of the result and get sufficient memory. */ 158 VA_OPEN (args, first); 159 VA_FIXEDARG (args, const char *, first); 160 newstr = XNEWVEC (char, vconcat_length (first, args) + 1); 161 VA_CLOSE (args); 162 163 /* Now copy the individual pieces to the result string. */ 164 VA_OPEN (args, first); 165 VA_FIXEDARG (args, const char *, first); 166 vconcat_copy (newstr, first, args); 167 VA_CLOSE (args); 168 169 return newstr; 170 } 171 172 /* 173 174 @deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @ 175 @dots{}, @code{NULL}) 176 177 Same as @code{concat}, except that if @var{optr} is not @code{NULL} it 178 is freed after the string is created. This is intended to be useful 179 when you're extending an existing string or building up a string in a 180 loop: 181 182 @example 183 str = reconcat (str, "pre-", str, NULL); 184 @end example 185 186 @end deftypefn 187 188 */ 189 190 char * 191 reconcat (char *optr, const char *first, ...) 192 { 193 char *newstr; 194 195 /* First compute the size of the result and get sufficient memory. */ 196 VA_OPEN (args, first); 197 VA_FIXEDARG (args, char *, optr); 198 VA_FIXEDARG (args, const char *, first); 199 newstr = XNEWVEC (char, vconcat_length (first, args) + 1); 200 VA_CLOSE (args); 201 202 /* Now copy the individual pieces to the result string. */ 203 VA_OPEN (args, first); 204 VA_FIXEDARG (args, char *, optr); 205 VA_FIXEDARG (args, const char *, first); 206 vconcat_copy (newstr, first, args); 207 if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */ 208 free (optr); 209 VA_CLOSE (args); 210 211 return newstr; 212 } 213 214 #ifdef MAIN 215 #define NULLP (char *)0 216 217 /* Simple little test driver. */ 218 219 #include <stdio.h> 220 221 int 222 main (void) 223 { 224 printf ("\"\" = \"%s\"\n", concat (NULLP)); 225 printf ("\"a\" = \"%s\"\n", concat ("a", NULLP)); 226 printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP)); 227 printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP)); 228 printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP)); 229 printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP)); 230 printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP)); 231 return 0; 232 } 233 234 #endif 235