valuefmt.c

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/*!
   \file lib/db/dbmi_base/valuefmt.c
 
   \brief DBMI Library (base) - value formatting
 
   (C) 1999-2009, 2011 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 Joel Jones (CERL/UIUC), Radim Blazek
   \author Doxygenized by Martin Landa <landa.martin gmail.com> (2011)
 */
 
#include <stdio.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/dbmi.h>
#include <grass/glocale.h>
 
/*!
   \brief Convert string to value
 
   \param Cstring string buffer
   \param sqltype SQL data type
   \param[out] value pointer to dbValue
 
   \return DB_OK on success
   \return DB_FAILED on error
 */
int db_convert_Cstring_to_value(const char *Cstring, int sqltype,
                                dbValue *value)
{
    int i;
    double d;
 
    switch (db_sqltype_to_Ctype(sqltype)) {
    case DB_C_TYPE_STRING:
        return db_set_value_string(value, Cstring);
    case DB_C_TYPE_INT:
        i = 0;
        sscanf(Cstring, "%d", &i);
        db_set_value_int(value, i);
        break;
    case DB_C_TYPE_DOUBLE:
        d = 0.0;
        sscanf(Cstring, "%lf", &d);
        db_set_value_double(value, d);
        break;
    case DB_C_TYPE_DATETIME:
        return db_convert_Cstring_to_value_datetime(Cstring, sqltype, value);
    default:
        db_error(_("db_convert_Cstring_to_value(): unrecognized sqltype"));
        return DB_FAILED;
    }
    return DB_OK;
}
 
/*!
   \brief Convert value to string
 
   \param value pointer to dbValue
   \param sqltype SQL data type
   \param[out] string pointer to dbString
 
   \return DB_OK on success
 */
int db_convert_value_to_string(dbValue *value, int sqltype, dbString *string)
{
    char buf[64];
    const char *bp = buf;
 
    if (db_test_value_isnull(value)) {
        *buf = 0;
    }
    else {
        switch (db_sqltype_to_Ctype(sqltype)) {
        case DB_C_TYPE_INT:
            snprintf(buf, sizeof(buf), "%d", db_get_value_int(value));
            break;
        case DB_C_TYPE_DOUBLE:
            snprintf(buf, sizeof(buf), "%.15g", db_get_value_double(value));
            G_trim_decimal(buf);
            break;
        case DB_C_TYPE_STRING:
            bp = db_get_value_string(value);
            break;
        case DB_C_TYPE_DATETIME:
            return db_convert_value_datetime_into_string(value, sqltype,
                                                         string);
        default:
            db_error(
                _("db_convert_value_into_string(): unrecongized sqltype-type"));
            return DB_FAILED;
        }
    }
    return db_set_string(string, bp);
}