Geografic-Information-System/lib/gis/key_value3.c

/*!
   \file key_value3.c

   \brief Key_Value management.

   (C) 2001-2008 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 <grass/gis.h>

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

   \param[in]  file filename for writing
   \param[in]  kv   Key_Value structure
   \param[out] stat status (0 ok, -3 cannot open file, -4 error writing key/value)

   \return 0 success
   \return 1 error writing
 */

int G_write_key_value_file(const char *file,
			   const struct Key_Value *kv, int *stat)
{
    FILE *fd;

    *stat = 0;
    fd = fopen(file, "w");
    if (fd == NULL)
	*stat = -3;
    else if (G_fwrite_key_value(fd, kv) != 0 || fclose(fd) == EOF)
	*stat = -4;
    return (*stat != 0);
}

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

   Allocated memory must be freed G_free_key_value().

   \param[in]  file filename for reading
   \param[out] stat status (0 ok, -1 cannot open file, -2 error writing key/value)

   \return poiter to allocated Key_Value structure
   \return NULL on error
 */
struct Key_Value *G_read_key_value_file(const char *file, int *stat)
{
    FILE *fd;
    struct Key_Value *kv;

    *stat = 0;
    fd = fopen(file, "r");
    if (fd == NULL) {
	*stat = -1;
	return NULL;
    }
    kv = G_fread_key_value(fd);
    fclose(fd);
    if (kv == NULL)
	*stat = -2;
    return kv;
}