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[/] [or1k/] [trunk/] [insight/] [libiberty/] [concat.c] - Rev 1774
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/* 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" #include <sys/types.h> /* size_t */ #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
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