key_value3.c

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/*!
   \file lib/gis/key_value3.c

   \brief Key_Value management.

   (C) 2001-2008, 2012 by the GRASS Development Team

   This program is free software under the GNU General Public License
   (>=v2).  Read the file COPYING that comes with GRASS for details.

   \author CERL
 */

#include <errno.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/glocale.h>

/*!
   \brief Write key/value pairs to file

   \param  file filename for writing
   \param  kv   pointer Key_Value structure

   \return 0 success
   \return 1 error writing
 */
void G_write_key_value_file(const char *file,
                            const struct Key_Value *kv)
{
    FILE *fp = fopen(file, "w");
    if (!fp)
        G_fatal_error(_("Unable to open output file <%s>: %s"), file, strerror(errno));

    if (G_fwrite_key_value(fp, kv) != 0)
        G_fatal_error(_("Error writing file <%s>: %s"), file, strerror(errno));

    if (fclose(fp) != 0)
        G_fatal_error(_("Error closing output file <%s>: %s"), file, strerror(errno));
}

/*!
   \brief Read key/values pairs from file

   Allocated memory must be freed G_free_key_value(). Call
   G_fatal_error() when unable to read key/value items from the file.

   \param[in]  file filename for reading

   \return pointer to allocated Key_Value structure
   \return NULL on error
 */
struct Key_Value *G_read_key_value_file(const char *file)
{
    FILE *fp;
    struct Key_Value *kv;

    fp = fopen(file, "r");
    if (!fp)
        G_fatal_error(_("Unable to open input file <%s>: %s"), file, strerror(errno));

    kv = G_fread_key_value(fp);
    if (!kv)
        G_fatal_error(_("Error reading file <%s>: %s"), file, strerror(errno));

    if (fclose(fp) != 0)
        G_fatal_error(_("Error closing input file <%s>: %s"), file, strerror(errno));

    return kv;
}