*: eliminate more aliasing warnings
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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12ca080a1c
@ -201,10 +201,14 @@
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* a lvalue. This makes it more likely to not swap them by mistake
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*/
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#if defined(i386) || defined(__x86_64__)
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# define move_from_unaligned_int(v, intp) ((v) = *(int*)(intp))
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# define move_from_unaligned16(v, u16p) ((v) = *(uint16_t*)(u16p))
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# define move_from_unaligned32(v, u32p) ((v) = *(uint32_t*)(u32p))
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# define move_to_unaligned32(u32p, v) (*(uint32_t*)(u32p) = (v))
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# include <stdint.h>
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typedef int bb__aliased_int FIX_ALIASING;
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typedef uint16_t bb__aliased_uint16_t FIX_ALIASING;
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typedef uint32_t bb__aliased_uint32_t FIX_ALIASING;
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# define move_from_unaligned_int(v, intp) ((v) = *(bb__aliased_int*)(intp))
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# define move_from_unaligned16(v, u16p) ((v) = *(bb__aliased_uint16_t*)(u16p))
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# define move_from_unaligned32(v, u32p) ((v) = *(bb__aliased_uint32_t*)(u32p))
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# define move_to_unaligned32(u32p, v) (*(bb__aliased_uint32_t*)(u32p) = (v))
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/* #elif ... - add your favorite arch today! */
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#else
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/* performs reasonably well (gcc usually inlines memcpy here) */
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@ -152,24 +152,24 @@ recv_from_to(int fd, void *buf, size_t len, int flags,
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if (cmsgptr->cmsg_level == IPPROTO_IP
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&& cmsgptr->cmsg_type == IP_PKTINFO
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) {
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# define pktinfo(cmsgptr) ( (struct in_pktinfo*)(CMSG_DATA(cmsgptr)) )
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const int IPI_ADDR_OFF = offsetof(struct in_pktinfo, ipi_addr);
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to->sa_family = AF_INET;
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/*# define pktinfo(cmsgptr) ( (struct in_pktinfo*)(CMSG_DATA(cmsgptr)) )*/
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/*to4->sin_addr = pktinfo(cmsgptr)->ipi_addr; - may be unaligned */
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memcpy(&to4->sin_addr, &pktinfo(cmsgptr)->ipi_addr, sizeof(to4->sin_addr));
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memcpy(&to4->sin_addr, (char*)(CMSG_DATA(cmsgptr)) + IPI_ADDR_OFF, sizeof(to4->sin_addr));
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/*to4->sin_port = 123; - this data is not supplied by kernel */
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# undef pktinfo
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break;
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}
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# if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
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if (cmsgptr->cmsg_level == IPPROTO_IPV6
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&& cmsgptr->cmsg_type == IPV6_PKTINFO
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) {
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# define pktinfo(cmsgptr) ( (struct in6_pktinfo*)(CMSG_DATA(cmsgptr)) )
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const int IPI6_ADDR_OFF = offsetof(struct in6_pktinfo, ipi6_addr);
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to->sa_family = AF_INET6;
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/*# define pktinfo(cmsgptr) ( (struct in6_pktinfo*)(CMSG_DATA(cmsgptr)) )*/
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/*to6->sin6_addr = pktinfo(cmsgptr)->ipi6_addr; - may be unaligned */
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memcpy(&to6->sin6_addr, &pktinfo(cmsgptr)->ipi6_addr, sizeof(to6->sin6_addr));
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memcpy(&to6->sin6_addr, (char*)(CMSG_DATA(cmsgptr)) + IPI6_ADDR_OFF, sizeof(to6->sin6_addr));
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/*to6->sin6_port = 123; */
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# undef pktinfo
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break;
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}
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# endif
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@ -75,29 +75,34 @@ int get_prefix(unsigned long netmask);
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#endif
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int ipcalc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int ipcalc_main(int argc, char **argv)
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int ipcalc_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opt;
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int have_netmask = 0;
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in_addr_t netmask, broadcast, network, ipaddr;
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struct in_addr a;
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bool have_netmask = 0;
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struct in_addr s_netmask, s_broadcast, s_network, s_ipaddr;
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/* struct in_addr { in_addr_t s_addr; } and in_addr_t
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* (which in turn is just a typedef to uint32_t)
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* are essentially the same type. A few macros for less verbosity: */
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#define netmask (s_netmask.s_addr)
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#define broadcast (s_broadcast.s_addr)
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#define network (s_network.s_addr)
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#define ipaddr (s_ipaddr.s_addr)
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char *ipstr;
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#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
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applet_long_options = ipcalc_longopts;
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#endif
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opt = getopt32(argv, "mbn" IF_FEATURE_IPCALC_FANCY("phs"));
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argc -= optind;
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argv += optind;
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if (opt & SILENT)
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logmode = LOGMODE_NONE; /* suppress error_msg() output */
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if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
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if (argc > 2 || argc <= 0)
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if (!argv[0] || !argv[1] || argv[2])
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bb_show_usage();
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} else {
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if (argc != 1)
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if (!argv[0] || argv[1])
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bb_show_usage();
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}
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if (opt & SILENT)
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logmode = LOGMODE_NONE; /* Suppress error_msg() output */
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ipstr = argv[0];
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if (ENABLE_FEATURE_IPCALC_FANCY) {
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@ -108,8 +113,7 @@ int ipcalc_main(int argc, char **argv)
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while (*prefixstr) {
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if (*prefixstr == '/') {
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*prefixstr = (char)0;
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prefixstr++;
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*prefixstr++ = '\0';
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if (*prefixstr) {
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unsigned msk;
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netprefix = xatoul_range(prefixstr, 0, 32);
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@ -130,42 +134,36 @@ int ipcalc_main(int argc, char **argv)
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prefixstr++;
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}
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}
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ipaddr = inet_aton(ipstr, &a);
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if (ipaddr == 0) {
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if (inet_aton(ipstr, &s_ipaddr) == 0) {
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bb_error_msg_and_die("bad IP address: %s", argv[0]);
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}
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ipaddr = a.s_addr;
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if (argc == 2) {
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if (argv[1]) {
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if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
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bb_error_msg_and_die("use prefix or netmask, not both");
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}
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netmask = inet_aton(argv[1], &a);
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if (netmask == 0) {
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if (inet_aton(argv[1], &s_netmask) == 0) {
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bb_error_msg_and_die("bad netmask: %s", argv[1]);
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}
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netmask = a.s_addr;
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} else {
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/* JHC - If the netmask wasn't provided then calculate it */
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if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
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netmask = get_netmask(ipaddr);
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}
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if (opt & NETMASK) {
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printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
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printf("NETMASK=%s\n", inet_ntoa(s_netmask));
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}
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if (opt & BROADCAST) {
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broadcast = (ipaddr & netmask) | ~netmask;
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printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
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printf("BROADCAST=%s\n", inet_ntoa(s_broadcast));
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}
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if (opt & NETWORK) {
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network = ipaddr & netmask;
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printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
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printf("NETWORK=%s\n", inet_ntoa(s_network));
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}
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if (ENABLE_FEATURE_IPCALC_FANCY) {
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@ -87,6 +87,7 @@ int FAST_FUNC arpping(uint32_t test_nip,
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/* wait for arp reply, and check it */
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timeout_ms = 2000;
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do {
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typedef uint32_t aliased_uint32_t FIX_ALIASING;
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int r;
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unsigned prevTime = monotonic_ms();
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@ -107,7 +108,7 @@ int FAST_FUNC arpping(uint32_t test_nip,
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&& arp.operation == htons(ARPOP_REPLY)
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/* don't check it: Linux doesn't return proper tHaddr (fixed in 2.6.24?) */
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/* && memcmp(arp.tHaddr, from_mac, 6) == 0 */
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&& *((uint32_t *) arp.sInaddr) == test_nip
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&& *(aliased_uint32_t*)arp.sInaddr == test_nip
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) {
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/* if ARP source MAC matches safe_mac
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* (which is client's MAC), then it's not a conflict
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@ -65,7 +65,7 @@ struct swap_header_v1 {
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uint32_t padding[117]; /* 11..127 */
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uint32_t badpages[1]; /* 128 */
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/* total 129 32-bit words in 2nd kilobyte */
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};
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} FIX_ALIASING;
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#define NWORDS 129
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#define hdr ((struct swap_header_v1*)bb_common_bufsiz1)
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@ -44,6 +44,7 @@ struct mdp_super_block {
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int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/, uint64_t size)
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{
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typedef uint32_t aliased_uint32_t FIX_ALIASING;
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#define off ((uint64_t)0)
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uint64_t sboff;
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uint8_t uuid[16];
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@ -63,7 +64,7 @@ int FAST_FUNC volume_id_probe_linux_raid(struct volume_id *id /*,uint64_t off*/,
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if (mdp->md_magic != cpu_to_le32(MD_MAGIC))
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return -1;
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*(uint32_t*)uuid = mdp->set_uuid0;
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*(aliased_uint32_t*)uuid = mdp->set_uuid0;
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memcpy(&uuid[4], &mdp->set_uuid1, 12);
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volume_id_set_uuid(id, uuid, UUID_DCE);
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