FreeCalypso > hg > freecalypso-tools
view target-utils/libcommon/dispatch.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 | e7502631a0f9 |
children |
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/* * This module implements the dispatch of interactively entered * commands to their respective implementation functions via cmdtab. */ #include "cmdtab.h" extern char command[]; extern struct cmdtab cmdtab[]; void command_dispatch() { char *cp, *np; struct cmdtab *tp; for (cp = command; *cp == ' '; cp++) ; if (!*cp) return; for (np = cp; *cp && *cp != ' '; cp++) ; if (*cp) *cp++ = '\0'; for (tp = cmdtab; tp->cmd; tp++) if (!strcmp(tp->cmd, np)) break; if (tp->func) tp->func(cp); else printf("ERROR: unknown or unimplemented command\n"); }