0bdcca681d
* concat.c: Include string.h. Fix int vs size_t usage.
Simplify the iteration loops. Use memcpy.
From-SVN: r43149
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/* Concatenate variable number of strings.
|
|
Copyright (C) 1991, 1994, 2001 Free Software Foundation, Inc.
|
|
Written by Fred Fish @ Cygnus Support
|
|
|
|
This file is part of the libiberty library.
|
|
Libiberty is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2 of the License, or (at your option) any later version.
|
|
|
|
Libiberty is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with libiberty; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
|
|
/*
|
|
|
|
NAME
|
|
|
|
concat -- concatenate a variable number of strings
|
|
|
|
SYNOPSIS
|
|
|
|
#include <varargs.h>
|
|
|
|
char *concat (s1, s2, s3, ..., NULL)
|
|
|
|
DESCRIPTION
|
|
|
|
Concatenate a variable number of strings and return the result
|
|
in freshly malloc'd memory.
|
|
|
|
Returns NULL if insufficient memory is available. The argument
|
|
list is terminated by the first NULL pointer encountered. Pointers
|
|
to empty strings are ignored.
|
|
|
|
NOTES
|
|
|
|
This function uses xmalloc() which is expected to be a front end
|
|
function to malloc() that deals with low memory situations. In
|
|
typical use, if malloc() returns NULL then xmalloc() diverts to an
|
|
error handler routine which never returns, and thus xmalloc will
|
|
never return a NULL pointer. If the client application wishes to
|
|
deal with low memory situations itself, it should supply an xmalloc
|
|
that just directly invokes malloc and blindly returns whatever
|
|
malloc returns.
|
|
*/
|
|
|
|
|
|
#include "ansidecl.h"
|
|
#include "libiberty.h"
|
|
|
|
#ifdef ANSI_PROTOTYPES
|
|
#include <stdarg.h>
|
|
#else
|
|
#include <varargs.h>
|
|
#endif
|
|
|
|
# if HAVE_STRING_H
|
|
# include <string.h>
|
|
# else
|
|
# if HAVE_STRINGS_H
|
|
# include <strings.h>
|
|
# endif
|
|
# endif
|
|
|
|
/* VARARGS */
|
|
#ifdef ANSI_PROTOTYPES
|
|
char *
|
|
concat (const char *first, ...)
|
|
#else
|
|
char *
|
|
concat (va_alist)
|
|
va_dcl
|
|
#endif
|
|
{
|
|
register size_t length;
|
|
register char *newstr;
|
|
register char *end;
|
|
register const char *arg;
|
|
va_list args;
|
|
#ifndef ANSI_PROTOTYPES
|
|
const char *first;
|
|
#endif
|
|
|
|
/* First compute the size of the result and get sufficient memory. */
|
|
#ifdef ANSI_PROTOTYPES
|
|
va_start (args, first);
|
|
#else
|
|
va_start (args);
|
|
first = va_arg (args, const char *);
|
|
#endif
|
|
|
|
length = 0;
|
|
for (arg = first; arg ; arg = va_arg (args, const char *))
|
|
length += strlen (arg);
|
|
|
|
va_end (args);
|
|
|
|
newstr = (char *) xmalloc (length + 1);
|
|
|
|
/* Now copy the individual pieces to the result string. */
|
|
#ifdef ANSI_PROTOTYPES
|
|
va_start (args, first);
|
|
#else
|
|
va_start (args);
|
|
first = va_arg (args, const char *);
|
|
#endif
|
|
|
|
end = newstr;
|
|
for (arg = first; arg ; arg = va_arg (args, const char *))
|
|
{
|
|
length = strlen (arg);
|
|
memcpy (end, arg, length);
|
|
end += length;
|
|
}
|
|
*end = '\000';
|
|
va_end (args);
|
|
|
|
return newstr;
|
|
}
|
|
|
|
#ifdef MAIN
|
|
#define NULLP (char *)0
|
|
|
|
/* Simple little test driver. */
|
|
|
|
#include <stdio.h>
|
|
|
|
int
|
|
main ()
|
|
{
|
|
printf ("\"\" = \"%s\"\n", concat (NULLP));
|
|
printf ("\"a\" = \"%s\"\n", concat ("a", NULLP));
|
|
printf ("\"ab\" = \"%s\"\n", concat ("a", "b", NULLP));
|
|
printf ("\"abc\" = \"%s\"\n", concat ("a", "b", "c", NULLP));
|
|
printf ("\"abcd\" = \"%s\"\n", concat ("ab", "cd", NULLP));
|
|
printf ("\"abcde\" = \"%s\"\n", concat ("ab", "c", "de", NULLP));
|
|
printf ("\"abcdef\" = \"%s\"\n", concat ("", "a", "", "bcd", "ef", NULLP));
|
|
return 0;
|
|
}
|
|
|
|
#endif
|