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/* Concatenate variable number of strings.
Copyright (C) 1991-2024 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., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
/*
@deftypefn Extension char* concat (const char *@var{s1}, const char *@var{s2}, @
@dots{}, @code{NULL})
Concatenate zero or more of strings and return the result in freshly
@code{xmalloc}ed memory. The argument list is terminated by the first
@code{NULL} pointer encountered. Pointers to empty strings are ignored.
@end deftypefn
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ansidecl.h"
#include "libiberty.h"
#include <sys/types.h> /* size_t */
#include <stdarg.h>
# if HAVE_STRING_H
# include <string.h>
# else
# if HAVE_STRINGS_H
# include <strings.h>
# endif
# endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
static inline unsigned long vconcat_length (const char *, va_list);
static inline unsigned long
vconcat_length (const char *first, va_list args)
{
unsigned long length = 0;
const char *arg;
for (arg = first; arg ; arg = va_arg (args, const char *))
length += strlen (arg);
return length;
}
static inline char *
vconcat_copy (char *dst, const char *first, va_list args)
{
char *end = dst;
const char *arg;
for (arg = first; arg ; arg = va_arg (args, const char *))
{
unsigned long length = strlen (arg);
memcpy (end, arg, length);
end += length;
}
*end = '\000';
return dst;
}
/* @undocumented concat_length */
unsigned long
concat_length (const char *first, ...)
{
unsigned long length;
va_list args;
va_start (args, first);
length = vconcat_length (first, args);
va_end (args);
return length;
}
/* @undocumented concat_copy */
char *
concat_copy (char *dst, const char *first, ...)
{
char *save_dst;
va_list args;
va_start (args, first);
vconcat_copy (dst, first, args);
save_dst = dst; /* With K&R C, dst goes out of scope here. */
va_end (args);
return save_dst;
}
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
char *libiberty_concat_ptr;
#ifdef __cplusplus
}
#endif /* __cplusplus */
/* @undocumented concat_copy2 */
char *
concat_copy2 (const char *first, ...)
{
va_list args;
va_start (args, first);
vconcat_copy (libiberty_concat_ptr, first, args);
va_end (args);
return libiberty_concat_ptr;
}
char *
concat (const char *first, ...)
{
char *newstr;
va_list args;
/* First compute the size of the result and get sufficient memory. */
va_start (args, first);
newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
va_end (args);
/* Now copy the individual pieces to the result string. */
va_start (args, first);
vconcat_copy (newstr, first, args);
va_end (args);
return newstr;
}
/*
@deftypefn Extension char* reconcat (char *@var{optr}, const char *@var{s1}, @
@dots{}, @code{NULL})
Same as @code{concat}, except that if @var{optr} is not @code{NULL} it
is freed after the string is created. This is intended to be useful
when you're extending an existing string or building up a string in a
loop:
@example
str = reconcat (str, "pre-", str, NULL);
@end example
@end deftypefn
*/
char *
reconcat (char *optr, const char *first, ...)
{
char *newstr;
va_list args;
/* First compute the size of the result and get sufficient memory. */
va_start (args, first);
newstr = XNEWVEC (char, vconcat_length (first, args) + 1);
va_end (args);
/* Now copy the individual pieces to the result string. */
va_start (args, first);
vconcat_copy (newstr, first, args);
if (optr) /* Done before VA_CLOSE so optr stays in scope for K&R C. */
free (optr);
va_end (args);
return newstr;
}
#ifdef MAIN
#define NULLP (char *)0
/* Simple little test driver. */
#include <stdio.h>
int
main (void)
{
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
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