FreeCalypso > hg > freecalypso-tools
view uptools/libcoding/alpha_addr.c @ 965:2969032bdfac
fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing
The only 100% safe way to pass a NULL pointer as a function argument
in K&R C is to cast 0 to a pointer type; failing to do so may cause
mysterious bugs (invalid stack frames or garbage in argument registers)
on 64-bit machines. This issue has already been fixed in most of
FC host tools, but I just found some missed spots: passing of NULL UDH
to PDU encoding functions in fcup-smsend[mult] in the case of single
(not concatenated) SMS.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 01 Sep 2023 07:33:51 +0000 |
parents | 74d5e95ee84a |
children |
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/* * This library module contains some bits that help working with * alphabetic addresses. */ #include <sys/types.h> u_char alpha_septets_to_digits[12] = {0, 2, 4, 6, 7, 9, 11, 13, 14, 16, 18, 20}; alpha_addr_valid(ndigits, sepp) unsigned ndigits, *sepp; { unsigned n; for (n = 1; n <= 11; n++) if (alpha_septets_to_digits[n] == ndigits) { *sepp = n; return(1); } return(0); }