| /* 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 |