FreeCalypso > hg > freecalypso-tools
view miscutil/make-imeisv.c @ 921:74d284add54d
fc-fsio: guard against bogus readdir results from the target
If the FFS being operated on contains SE K2x0 extended filenames,
readdir will return strings that are bad for printing. We need to
guard against this possibility, and also against possible other
bogosity that could be sent by other alien firmwares.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 31 Dec 2022 22:55:23 +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); }