view miscutil/make-imeisv.c @ 1012:11391cb6bdc0

patch from fixeria: doc change from SE K2x0 to K2xx Since their discovery in late 2022, Sony Ericsson K200 and K220 phones were collectively referred to as SE K2x0 in FreeCalypso documentation. However, now that SE K205 has been discovered as yet another member of the same family (same PCBA in different case), it makes more sense to refer to the whole family as SE K2xx.
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 23 Sep 2024 12:23:20 +0000
parents 2dcfad8a3ed0
children
line wrap: on
line source

/*
 * This utility constructs a 16-digit IMEISV from a 15-digit IMEI
 * (which must have a valid Luhn check digit) and a 2-digit SV field.
 * It is intended for use in shell scripts.
 */

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

parse_imei_arg(input, buf)
	char *input, *buf;
{
	char *cp;
	int i;

	cp = input;
	if (!isdigit(*cp)) {
inv:		fprintf(stderr,
			"error: IMEI argument must have 15 decimal digits\n");
		exit(1);
	}
	for (i = 0; i < 15; i++) {
		if (ispunct(*cp))
			cp++;
		if (!isdigit(*cp))
			goto inv;
		buf[i] = *cp++;
	}
	if (*cp)
		goto inv;
}

check_luhn(digits)
	char *digits;
{
	int i, dig, sum;

	sum = 0;
	for (i = 0; i < 14; i++) {
		dig = digits[i] - '0';
		if (i & 1) {
			dig *= 2;
			if (dig > 9)
				dig -= 9;
		}
		sum += dig;
	}
	dig = sum % 10;
	if (dig)
		dig = 10 - dig;
	if (digits[14] != dig + '0') {
		fprintf(stderr, "error: given IMEI fails Luhn check\n");
		exit(1);
	}
}

main(argc, argv)
	char **argv;
{
	char imeibuf[15];

	if (argc != 3) {
		fprintf(stderr, "usage: %s IMEI SV\n", argv[0]);
		exit(1);
	}
	parse_imei_arg(argv[1], imeibuf);
	check_luhn(imeibuf);
	if (!isdigit(argv[2][0]) || !isdigit(argv[2][1]) || argv[2][2]) {
		fprintf(stderr,
			"error: SV argument must have 2 decimal digits\n");
		exit(1);
	}
	printf("%.8s-%.6s-%s\n", imeibuf, imeibuf + 8, argv[2]);
	exit(0);
}