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  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.