is_literal_valid()

static int is_literal_valid ( const char *  literal )

static

Shortest allowed literal: containing cardinal direction > cardinal direction + degree with 3 digits no cardinal direction > degree with 3 digits

The variable "coord_start" stores the position where the coordinates start (0 or 1), so that the script can identify where each literal element begins to validate its content.

The first three characters represent the degrees and they must be numeric.

Decimal degrees are encoded with after the 3rd character with either a dot or a comma. Only one decimal separator is allowed.

Definition at line 94 of file lwgeom_in_marc21.c.

                                                 {
 
        int num_dec_sep;
        int coord_start;
        int literal_length;
 
        if(literal == NULL) return LW_FALSE;
 
        literal_length = strlen(literal);
 
        POSTGIS_DEBUGF(2, "is_literal_valid called (%s)", literal);
 
        if (literal_length < 3) return LW_FALSE;
 
        coord_start = 0;
        num_dec_sep = 0;
 
        if (literal[0] == 'N' || literal[0] == 'E' || literal[0] == 'S' || literal[0] == 'W' || literal[0] == '+' || literal[0] == '-') {
 
                if (literal_length < 4) {
                        POSTGIS_DEBUGF(3, "  invalid literal length (%d): \"%s\"", literal_length, literal);
                        return LW_FALSE;
                }
 
                coord_start = 1;
        }
 
        for (int j = coord_start; j < literal_length; j++) {
 
                if (!isdigit(literal[j])) {
 
 
                        if (j < 3) {
 
                                POSTGIS_DEBUGF(3,"  invalid character '%c' at the degrees section: \"%s\"",     literal[j], literal);
                                return LW_FALSE;
 
                        }
 
                        if (literal[j] == '.' || literal[j] == ',') {
 
                                num_dec_sep++;
 
                                if (num_dec_sep > 1) return LW_FALSE;
 
                        } else {
                                POSTGIS_DEBUGF(3, "  invalid character '%c' in %d: \"%s\"",     literal[j], j, literal);
                                return LW_FALSE;
 
                        }
 
                }
 
        }
 
        POSTGIS_DEBUGF(2, "=> is_literal_valid returns LW_TRUE for \"%s\"",     literal);
        return LW_TRUE;
 
}

References LW_FALSE, and LW_TRUE.

Referenced by parse_marc21().

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