wind_scan.c

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#include <stdio.h>
#include <grass/gis.h>


static int scan_double(const char *, double *);


int G_scan_northing(const char *buf, double *northing, int projection)
{
    if (projection == PROJECTION_LL) {
        if (G_lat_scan(buf, northing))
            return 1;
        if (!scan_double(buf, northing))
            return 0;

        return (*northing <= 90.0 && *northing >= -90.0);
    }

    return scan_double(buf, northing);
}


int G_scan_easting(const char *buf, double *easting, int projection)
{
    if (projection == PROJECTION_LL) {
        if (G_lon_scan(buf, easting))
            return 1;
        if (!scan_double(buf, easting))
            return 0;
        while (*easting > 180.0)
            *easting -= 360.0;
        while (*easting < -180.0)
            *easting += 360.0;

        return 1;
    }

    return scan_double(buf, easting);
}


int G_scan_resolution(const char *buf, double *res, int projection)
{
    if (projection == PROJECTION_LL) {
        if (G_llres_scan(buf, res))
            return 1;
    }

    return (scan_double(buf, res) && *res > 0.0);
}


static int scan_double(const char *buf, double *value)
{
    char junk[2];

    /* use sscanf to convert buf to double
     * make sure value doesn't have other characters after it */

    *junk = 0;
    *value = 0.0;

    if (sscanf(buf, "%lf%1s", value, junk) == 1 && *junk == 0) {
        while (*buf)
            buf++;
        buf--;

        if (*buf >= 'A' && *buf <= 'Z')
            return 0;
        if (*buf >= 'a' && *buf <= 'z')
            return 0;

        return 1;               /* success */
    }

    return 0;                   /* failure */
}