/* Concatenate variable number of strings. Copyright (C) 1991-2021 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