FreeCalypso > hg > freecalypso-tools
view miscutil/make-imeisv.c @ 749:fa6fee41f06e
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author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 22 Oct 2020 06:17:11 +0000 |
parents | 2dcfad8a3ed0 |
children |
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/* * 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); }