root/libutil/makepath.c

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DEFINITIONS

This source file includes following definitions.
  1. makepath

/*
 * Copyright (c) 1997, 1998, 1999, 2000
 *      Tama Communications Corporation
 *
 * This file is part of GNU GLOBAL.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif

#include "gparam.h"
#include "die.h"
#include "makepath.h"
#include "strbuf.h"

/*
 * makepath: make path from directory and file.
 *
 *      i)      dir     directory(optional)
 *      i)      file    file
 *      i)      suffix  suffix(optional)
 *      r)              path
 *
 * It is necessary to note the usage of makepath(), because it returns
 * module local area. If makepath() is called again in the function which
 * is passed the return value of makepath(), then the value is overwritten.
 * This may cause the bug which is not understood easily.
 * You must not pass the return value except for the safe functions
 * described below.
 * 
 * Here are safe functions.
 * o functions in standard C library.
 * o following libutil functions:
 *   test(), dbop_open(), strlimcpy(), strbuf_puts(), die()
 */
const char *
makepath(const char *dir, const char *file, const char *suffix)
{
        STATIC_STRBUF(sb);
        int length;
        char sep = '/';

        strbuf_clear(sb);
        if (dir != NULL) {
                if ((length = strlen(dir)) > MAXPATHLEN)
                        die("path name too long. '%s'\n", dir);

#if defined(_WIN32) || defined(__DJGPP__)
                /* follows native way. */
                if (dir[0] == '\\' || dir[2] == '\\')
                        sep = '\\';
#endif
                strbuf_puts(sb, dir);
                strbuf_unputc(sb, sep);
                strbuf_putc(sb, sep);
        }
        strbuf_puts(sb, file);
        if (suffix) {
                if (*suffix != '.')
                        strbuf_putc(sb, '.');
                strbuf_puts(sb, suffix);
        }
        if ((length = strlen(strbuf_value(sb))) > MAXPATHLEN)
                die("path name too long. '%s'\n", strbuf_value(sb));
        return strbuf_value(sb);
}

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