libiberty/concat.c

   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 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 #ifdef HAVE_CONFIG_H
  57 #include "config.h"
  58 #endif
  59 #include "ansidecl.h"
  60 #include "libiberty.h"
  61 #include <sys/types.h>          /* size_t */
  62
  63 #ifdef ANSI_PROTOTYPES
  64 #include <stdarg.h>
  65 #else
  66 #include <varargs.h>
  67 #endif
  68
  69 # if HAVE_STRING_H
  70 #  include <string.h>
  71 # else
  72 #  if HAVE_STRINGS_H
  73 #   include <strings.h>
  74 #  endif
  75 # endif
  76
  77 #if HAVE_STDLIB_H
  78 #include <stdlib.h>
  79 #endif
  80
  81 static inline unsigned long vconcat_length PARAMS ((const char *, va_list));
  82 static inline unsigned long
  83 vconcat_length (first, args)
  84      const char *first;
  85      va_list args;
  86 {
  87   unsigned long length = 0;
  88   const char *arg;
  89
  90   for (arg = first; arg ; arg = va_arg (args, const char *))
  91     length += strlen (arg);
  92
  93   return length;
  94 }
  95
  96 static inline char *vconcat_copy PARAMS ((char *, const char *, va_list));
  97 static inline char *
  98 vconcat_copy (dst, first, args)
  99      char *dst;
 100      const char *first;
 101      va_list args;
 102 {
 103   char *end = dst;
 104   const char *arg;
 105
 106   for (arg = first; arg ; arg = va_arg (args, const char *))
 107     {
 108       unsigned long length = strlen (arg);
 109       memcpy (end, arg, length);
 110       end += length;
 111     }
 112   *end = '\000';
 113
 114   return dst;
 115 }
 116
 117 unsigned long
 118 concat_length VPARAMS ((const char *first, ...))
 119 {
 120   unsigned long length;
 121
 122   VA_OPEN (args, first);
 123   VA_FIXEDARG (args, const char *, first);
 124   length = vconcat_length (first, args);
 125   VA_CLOSE (args);
 126
 127   return length;
 128 }
 129
 130 char *
 131 concat_copy VPARAMS ((char *dst, const char *first, ...))
 132 {
 133   char *save_dst;
 134
 135   VA_OPEN (args, first);
 136   VA_FIXEDARG (args, char *, dst);
 137   VA_FIXEDARG (args, const char *, first);
 138   vconcat_copy (dst, first, args);
 139   save_dst = dst; /* With K&R C, dst goes out of scope here.  */
 140   VA_CLOSE (args);
 141
 142   return save_dst;
 143 }
 144
 145 char *libiberty_concat_ptr;
 146
 147 char *
 148 concat_copy2 VPARAMS ((const char *first, ...))
 149 {
 150   VA_OPEN (args, first);
 151   VA_FIXEDARG (args, const char *, first);
 152   vconcat_copy (libiberty_concat_ptr, first, args);
 153   VA_CLOSE (args);
 154
 155   return libiberty_concat_ptr;
 156 }
 157
 158 char *
 159 concat VPARAMS ((const char *first, ...))
 160 {
 161   char *newstr;
 162
 163   /* First compute the size of the result and get sufficient memory.  */
 164   VA_OPEN (args, first);
 165   VA_FIXEDARG (args, const char *, first);
 166   newstr = (char *) xmalloc (vconcat_length (first, args) + 1);
 167   VA_CLOSE (args);
 168
 169   /* Now copy the individual pieces to the result string. */
 170   VA_OPEN (args, first);
 171   VA_FIXEDARG (args, const char *, first);
 172   vconcat_copy (newstr, first, args);
 173   VA_CLOSE (args);
 174
 175   return newstr;
 176 }
 177
 178 char *
 179 reconcat VPARAMS ((char *optr, const char *first, ...))
 180 {
 181   char *newstr;
 182
 183   /* First compute the size of the result and get sufficient memory.  */
 184   VA_OPEN (args, first);
 185   VA_FIXEDARG (args, char *, optr);
 186   VA_FIXEDARG (args, const char *, first);
 187   newstr = (char *) xmalloc (vconcat_length (first, args) + 1);
 188   VA_CLOSE (args);
 189
 190   /* Now copy the individual pieces to the result string. */
 191   VA_OPEN (args, first);
 192   VA_FIXEDARG (args, char *, optr);
 193   VA_FIXEDARG (args, const char *, first);
 194   vconcat_copy (newstr, first, args);
 195   if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C.  */
 196     free (optr);
 197   VA_CLOSE (args);
 198
 199   return newstr;
 200 }
 201
 202 #ifdef MAIN
 203 #define NULLP (char *)0
 204
 205 /* Simple little test driver. */
 206
 207 #include <stdio.h>
 208
 209 int
 210 main ()
 211 {
 212   printf ("\"\" = \"%s\"\n", concat (NULLP));
 213   printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
 214   printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
 215   printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
 216   printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
 217   printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
 218   printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
 219   return 0;
 220 }
 221
 222 #endif