168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/* Concatenate variable number of strings.
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Copyright (C) 1991, 1994 Free Software Foundation, Inc.
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Written by Fred Fish @ Cygnus Support
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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NAME
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concat -- concatenate a variable number of strings
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SYNOPSIS
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#include <varargs.h>
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char *concat (s1, s2, s3, ..., NULL)
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DESCRIPTION
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Concatenate a variable number of strings and return the result
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in freshly malloc'd memory.
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Returns NULL if insufficient memory is available. The argument
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list is terminated by the first NULL pointer encountered. Pointers
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to empty strings are ignored.
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NOTES
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This function uses xmalloc() which is expected to be a front end
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function to malloc() that deals with low memory situations. In
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typical use, if malloc() returns NULL then xmalloc() diverts to an
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error handler routine which never returns, and thus xmalloc will
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never return a NULL pointer. If the client application wishes to
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deal with low memory situations itself, it should supply an xmalloc
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that just directly invokes malloc and blindly returns whatever
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malloc returns.
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*/
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#include "ansidecl.h"
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#include "libiberty.h"
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#ifdef ANSI_PROTOTYPES
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#ifdef __STDC__
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#include <stddef.h>
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extern size_t strlen (const char *s);
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#else
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extern int strlen ();
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#endif
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#define NULLP (char *)0
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/* VARARGS */
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#ifdef ANSI_PROTOTYPES
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char *
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concat (const char *first, ...)
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#else
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char *
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concat (va_alist)
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va_dcl
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#endif
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{
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register int length;
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register char *newstr;
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register char *end;
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register const char *arg;
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va_list args;
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#ifndef ANSI_PROTOTYPES
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const char *first;
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#endif
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/* First compute the size of the result and get sufficient memory. */
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#ifdef ANSI_PROTOTYPES
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va_start (args, first);
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#else
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va_start (args);
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first = va_arg (args, const char *);
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#endif
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if (first == NULLP)
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length = 0;
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else
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{
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length = strlen (first);
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while ((arg = va_arg (args, const char *)) != NULLP)
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{
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length += strlen (arg);
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}
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}
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newstr = (char *) xmalloc (length + 1);
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va_end (args);
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/* Now copy the individual pieces to the result string. */
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if (newstr != NULLP)
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{
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#ifdef ANSI_PROTOTYPES
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va_start (args, first);
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#else
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va_start (args);
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first = va_arg (args, const char *);
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#endif
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end = newstr;
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if (first != NULLP)
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{
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arg = first;
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while (*arg)
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{
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*end++ = *arg++;
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}
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while ((arg = va_arg (args, const char *)) != NULLP)
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{
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while (*arg)
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{
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*end++ = *arg++;
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}
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}
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}
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*end = '\000';
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va_end (args);
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}
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return (newstr);
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}
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#ifdef MAIN
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/* Simple little test driver. */
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#include <stdio.h>
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int
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main ()
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{
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printf ("\"\" = \"%s\"\n", concat (NULLP));
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printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
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printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
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printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
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printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
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printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
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printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
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return 0;
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}
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#endif
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