lint_latitude.c File Reference

Purpose

The latitude linter ensures that the given data represents the latitude component of a WGS84 coordinate expressed as a 10-digit number.

Functional Description

gs1_lint_latitude()

GS1_SYNTAX_DICTIONARY_API gs1_lint_err_t gs1_lint_latitude	(	const char *const	data,
		size_t *const	err_pos,
		size_t *const	err_len
	)

Used to validate that an AI component represents the latitude component of a WGS84 coordinate expressed as a 10-digit number.

Parameters

[in]	data	Pointer to the null-terminated data to be linted. Must not be NULL.
[out]	err_pos	To facilitate error highlighting, the start position of the bad data is written to this pointer, if not NULL.
[out]	err_len	The length of the bad data is written to this pointer, if not NULL.

Returns

GS1_LINTER_OK if okay.

GS1_LINTER_LATITUDE_INVALID_LENGTH if the latitude does not have length 10.

GS1_LINTER_INVALID_LATITUDE if the latitude is outside the range 0000000000 - 1800000000.

{
 
        size_t len, pos;
 
        assert(data);
 
        len = strlen(data);
 
        /*
         * Data must be 10 characters.
         *
         */
        if (len != 10) {
                if (err_pos) *err_pos = 0;
                if (err_len) *err_len = len;
                return GS1_LINTER_LATITUDE_INVALID_LENGTH;
        }
 
        /*
         * Data must consist of all digits.
         *
         */
        if ((pos = strspn(data, "0123456789")) != len) {
                if (err_pos) *err_pos = pos;
                if (err_len) *err_len = 1;
                return GS1_LINTER_NON_DIGIT_CHARACTER;
        }
 
        /*
         * The latitude must be within the range 0000000000 to 1800000000.
         *
         */
        if (strtoul(data, NULL, 10) > 1800000000) {
                if (err_pos) *err_pos = 0;
                if (err_len) *err_len = 10;
                return GS1_LINTER_INVALID_LATITUDE;
        }
 
        return GS1_LINTER_OK;
 
}