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dd: fix skip= parse error (spotted by Dirk Clemens <develop@cle-mens.de>)
This commit is contained in:
Denis Vlasenko
parent
9ace613406
commit
d1801a4430
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@ -58,7 +58,7 @@ static bool write_and_stats(int fd, const void *buf, size_t len, size_t obs,
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return 1;
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if (n == obs)
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G.out_full++;
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else if (n > 0)
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else if (n) /* > 0 */
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G.out_part++;
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return 0;
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}
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@ -73,10 +73,10 @@ int dd_main(int argc, char **argv);
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int dd_main(int argc, char **argv)
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{
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enum {
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sync_flag = 1 << 0,
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noerror = 1 << 1,
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trunc_flag = 1 << 2,
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twobufs_flag = 1 << 3,
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SYNC_FLAG = 1 << 0,
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NOERROR = 1 << 1,
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TRUNC_FLAG = 1 << 2,
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TWOBUFS_FLAG = 1 << 3,
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};
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static const char * const keywords[] = {
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"bs=", "count=", "seek=", "skip=", "if=", "of=",
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@ -98,10 +98,10 @@ int dd_main(int argc, char **argv)
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OP_conv,
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OP_conv_notrunc,
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OP_conv_sync,
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OP_conv_noerror,
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OP_conv_NOERROR,
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#endif
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};
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int flags = trunc_flag;
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int flags = TRUNC_FLAG;
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size_t oc = 0, ibs = 512, obs = 512;
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ssize_t n, w;
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off_t seek = 0, skip = 0, count = OFF_T_MAX;
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@ -152,23 +152,23 @@ int dd_main(int argc, char **argv)
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while (1) {
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/* find ',', replace them with nil so we can use arg for
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* index_in_str_array without copying.
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* We rely on arg being non-null, else strstr would fault.
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* We rely on arg being non-null, else strchr would fault.
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*/
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key = strstr(arg, ",");
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key = strchr(arg, ',');
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if (key)
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*key = '\0';
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what = index_in_str_array(keywords, arg) + 1;
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if (what < OP_conv_notrunc)
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bb_error_msg_and_die(bb_msg_invalid_arg, arg, "conv");
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if (what == OP_conv_notrunc)
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flags &= ~trunc_flag;
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flags &= ~TRUNC_FLAG;
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if (what == OP_conv_sync)
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flags |= sync_flag;
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if (what == OP_conv_noerror)
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flags |= noerror;
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flags |= SYNC_FLAG;
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if (what == OP_conv_NOERROR)
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flags |= NOERROR;
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if (!key) /* no ',' left, so this was the last specifier */
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break;
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arg += key - arg + 1; /* skip this keyword plus ',' */
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arg = key + 1; /* skip this keyword and ',' */
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}
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continue;
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}
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@ -186,7 +186,7 @@ int dd_main(int argc, char **argv)
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seek = XATOU_SFX(arg, dd_suffixes);
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continue;
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}
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if (what == skip) {
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if (what == OP_skip) {
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skip = XATOU_SFX(arg, dd_suffixes);
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continue;
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}
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@ -200,7 +200,7 @@ int dd_main(int argc, char **argv)
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//XXX:FIXME for huge ibs or obs, malloc'ing them isn't the brightest idea ever
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ibuf = obuf = xmalloc(ibs);
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if (ibs != obs) {
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flags |= twobufs_flag;
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flags |= TWOBUFS_FLAG;
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obuf = xmalloc(obs);
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}
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if (infile != NULL)
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@ -212,12 +212,12 @@ int dd_main(int argc, char **argv)
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if (outfile != NULL) {
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int oflag = O_WRONLY | O_CREAT;
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if (!seek && (flags & trunc_flag))
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if (!seek && (flags & TRUNC_FLAG))
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oflag |= O_TRUNC;
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ofd = xopen(outfile, oflag);
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if (seek && (flags & trunc_flag)) {
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if (seek && (flags & TRUNC_FLAG)) {
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if (ftruncate(ofd, seek * obs) < 0) {
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struct stat st;
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@ -247,13 +247,13 @@ int dd_main(int argc, char **argv)
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}
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while (G.in_full + G.in_part != count) {
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if (flags & noerror) /* Pre-zero the buffer when for noerror */
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if (flags & NOERROR) /* Pre-zero the buffer when for NOERROR */
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memset(ibuf, '\0', ibs);
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n = safe_read(ifd, ibuf, ibs);
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if (n == 0)
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break;
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if (n < 0) {
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if (flags & noerror) {
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if (flags & NOERROR) {
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n = ibs;
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bb_perror_msg("%s", infile);
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} else
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@ -263,12 +263,12 @@ int dd_main(int argc, char **argv)
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G.in_full++;
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else {
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G.in_part++;
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if (flags & sync_flag) {
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if (flags & SYNC_FLAG) {
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memset(ibuf + n, '\0', ibs - n);
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n = ibs;
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}
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}
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if (flags & twobufs_flag) {
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if (flags & TWOBUFS_FLAG) {
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char *tmp = ibuf;
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while (n) {
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size_t d = obs - oc;
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@ -285,9 +285,8 @@ int dd_main(int argc, char **argv)
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oc = 0;
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}
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}
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} else
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if (write_and_stats(ofd, ibuf, n, obs, outfile))
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goto out_status;
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} else if (write_and_stats(ofd, ibuf, n, obs, outfile))
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goto out_status;
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}
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if (ENABLE_FEATURE_DD_IBS_OBS && oc) {
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@ -2,8 +2,12 @@ strace of "sleep 1 | sleep 2" being run from interactive bash 3.0
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Synopsis:
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open /dev/tty [, if fails, open ttyname(0)]; close /* helps re-establish ctty */
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get current signal mask
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install default handlers for GHLD QUIT TERM
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TCGETS on fd# 0
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TCGETS on fd# 2 /* NB: if returns ENOTTY (2>/dev/null), sh seems to disable job control,
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does not show prompt, but still executes cmds from fd# 0 */
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install default handlers for CHLD QUIT TERM
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install common handler for HUP INT ILL TRAP ABRT FPE BUS SEGV SYS PIPE ALRM TERM XCPU XFSZ VTALRM USR1 USR2
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ignore QUIT
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install handler for INT
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@ -34,11 +38,73 @@ get our pprocess group
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signal followed by a SIGCONT signal will be sent to each process
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in the newly-orphaned process group.
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...
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dup stderr to fd# 255
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move ourself to our own process group
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block CHLD TSTP TTIN TTOU
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set tty's (255, stderr's) foreground process group to our group
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allow all signals
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mark 255 CLOEXEC
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set CHLD handler
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get signal mask
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get fd#0 flags
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get signal mask
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set INT handler
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block CHLD TSTP TTIN TTOU
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set fd #255 foreground process group to our group
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allow all signals
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set INT handler
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block all signals
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allow all signals
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block INT
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allow all signals
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lotsa sigactions: set INT,ALRM,WINCH handlers, ignore TERM,QUIT,TSTP,TTOU,TTIN
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block all signals
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allow all signals
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block all signals
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allow all signals
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block all signals
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allow all signals
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read "sleep 1 | sleep 2\n"
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block INT
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TCSETSW on fd# 0
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allow all signals
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lotsa sigactions: set INT,ALRM,WINCH handlers, ignore TERM,QUIT,TSTP,TTOU,TTIN
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block CHLD
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pipe([4, 5]) /* oops seems I lost another pipe() in editing... */
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fork child #1
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put child in it's own process group
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block only CHLD
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close(5)
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block only INT CHLD
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fork child #2
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put child in the same process group as first one
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block only CHLD
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close(4)
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block only CHLD
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block only CHLD TSTP TTIN TTOU
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set fd# 255 foreground process group to first child's one
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block only CHLD
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block only CHLD
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block only CHLD
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wait4 for children to die or stop - first child exits
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wait4 for children to die or stop - second child exits
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block CHLD TSTP TTIN TTOU
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set fd# 255 foreground process group to our own one
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block only CHLD
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block only CHLD
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block nothing
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--- SIGCHLD (Child exited) @ 0 (0) ---
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wait for it - no child (already waited for)
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sigreturn()
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read signal mask
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lotsa sigactions...
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read next command
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execve("/bin/sh", ["sh"], [/* 34 vars */]) = 0
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rt_sigprocmask(SIG_BLOCK, NULL, [], 8) = 0
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ioctl(0, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
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ioctl(2, SNDCTL_TMR_TIMEBASE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
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rt_sigaction(SIGCHLD, {SIG_DFL}, {SIG_DFL}, 8) = 0
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rt_sigaction(SIGQUIT, {SIG_DFL}, {SIG_DFL}, 8) = 0
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rt_sigaction(SIGTERM, {SIG_DFL}, {SIG_DFL}, 8) = 0
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