2.3-InternetRadio/nutos/nut/crt/putenv.c

/*
 * Copyright 2008 by egnite Software GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * For additional information see http://www.ethernut.de/
 */

#include <sys/environ.h>
#include <sys/nutdebug.h>

#include <stdlib.h>
#include <string.h>

/*!
 * \brief Add a new or update an existing environment variable.
 *
 * \param Points to a string of the form 'name=value'.
 *
 * \return 0 upon successful completion. Otherwise, -1 is returned and
 *         errno is set to indicate the error.
 */
#if defined(__arm__) || defined(__AVR32__) || defined(__m68k__)
int putenv(char *string)
#else
int putenv(const char *string)
#endif
{
    int rc = -1;
    char *value;
    char *name;

    NUTASSERT(string != NULL);
    if ((name = strdup(string)) != NULL) {
        if ((value = strchr(name, '=')) != NULL) {
        *value++ = 0;
        }
        rc = setenv(name, value, 1);
        free(name);
    }
    return rc;
}