FreeCalypso > hg > freecalypso-tools
view uptools/atcmd/settime.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 | dc2fd8e6f42c |
children |
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line source
/* * This utility sends an AT+CCLK command to the GSM device to set its time * to the host's notion of local time. */ #include <time.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include "../../rvinterf/include/exitcodes.h" main(argc, argv) char **argv; { int c; extern int optind; time_t unixtime; struct tm *tm; char command[32]; while ((c = getopt(argc, argv, "B:np:RX:")) != EOF) if (!atinterf_cmdline_opt(c)) { /* error msg already printed */ exit(ERROR_USAGE); } if (argc != optind) { fprintf(stderr, "usage: %s [options]\n", argv[0]); exit(ERROR_USAGE); } atinterf_init(); time(&unixtime); tm = localtime(&unixtime); sprintf(command, "AT+CCLK=\"%02d/%02d/%02d,%02d:%02d:%02d%+03d\"", tm->tm_year % 100, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, tm->tm_gmtoff / (15*60)); atinterf_exec_cmd_needok(command, (char *) 0, (void *) 0); exit(0); }