lint_mmoptss.c File Reference

Purpose

The mmoptss linter ensures that the data represents a meaningful time fragment as minutes and optional seconds, in MMSS or MM format.

Functional Description

gs1_lint_mmoptss()

GS1_SYNTAX_DICTIONARY_API gs1_lint_err_t gs1_lint_mmoptss	(	const char *const	data,
		size_t *const	err_pos,
		size_t *const	err_len
	)

Used to ensure that an AI component conforms to one of the MMSS or MM formats.

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_MMSS_INVALID_LENGTH if the data neither two not two characters.

GS1_LINTER_NON_DIGIT_CHARACTER if the data contains a non-digit character.

GS1_LINTER_ILLEGAL_MINUTE if the data contains an invalid minute.

GS1_LINTER_ILLEGAL_SECOND if the data contains an invalid second.

{
 
        size_t len, pos;
 
        assert(data);
 
        len = strlen(data);
 
        /*
         * Data must be two or four characters.
         *
         */
        if (len != 2 && len != 4) {
                if (err_pos) *err_pos = 0;
                if (err_len) *err_len = len;
                return GS1_LINTER_MMSS_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;
        }
 
        /*
         * Validate the minute.
         *
         */
        if ((data[0] - '0') * 10 + (data[1] - '0') > 59) {
                if (err_pos) *err_pos = 0;
                if (err_len) *err_len = 2;
                return GS1_LINTER_ILLEGAL_MINUTE;
        }
 
        /*
         * Validate the second, if it is provided.
         *
         */
        if (len == 4 && (data[2] - '0') * 10 + (data[3] - '0') > 59) {
                if (err_pos) *err_pos = 2;
                if (err_len) *err_len = 2;
                return GS1_LINTER_ILLEGAL_SECOND;
        }
 
        return GS1_LINTER_OK;
 
}