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last_patch55 from vodz:

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I found overflow problem in xargs applet
    (allocated not space for trailing '\0').
    Last patch also reduce 22 bytes size. ;)
This commit is contained in:
Eric Andersen 2002-09-16 10:44:24 +00:00
parent 02b8dfc524
commit d4ee98940b
1 changed files with 20 additions and 18 deletions
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38
findutils/xargs.c
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@ -28,8 +28,10 @@
int xargs_main(int argc, char **argv) int xargs_main(int argc, char **argv)
{ {
char *cmd_to_be_executed = NULL; char *cmd_to_be_executed;
char *file_to_act_on = NULL; char *file_to_act_on;
int i;
int len;
/* /*
* No options are supported in this version of xargs; no getopt. * No options are supported in this version of xargs; no getopt.
@ -42,41 +44,41 @@ int xargs_main(int argc, char **argv)
* once with no args and xargs will echo the filename. Simple. * once with no args and xargs will echo the filename. Simple.
*/ */
argv++;
len = argc; /* arg = count for ' ' + trailing '\0' */
/* Store the command to be executed (taken from the command line) */ /* Store the command to be executed (taken from the command line) */
if (argc == 1) { if (argc == 1) {
/* default behavior is to echo all the filenames */ /* default behavior is to echo all the filenames */
cmd_to_be_executed = xstrdup("/bin/echo "); argv[0] = "/bin/echo";
len++; /* space for trailing '\0' */
} else { } else {
/* concatenate all the arguments passed to xargs together */ argc--;
int i;
int len = 0;
for (i = 1; i < argc; i++)
len += ( strlen(argv[i]) + 1 );
cmd_to_be_executed = xstrndup ( "", len );
for (i = 1; i < argc; i++) {
strcat(cmd_to_be_executed, argv[i]);
strcat(cmd_to_be_executed, " ");
} }
/* concatenate all the arguments passed to xargs together */
for (i = 0; i < argc; i++)
len += strlen(argv[i]);
cmd_to_be_executed = xmalloc (len);
for (i = len = 0; i < argc; i++) {
len = sprintf(cmd_to_be_executed + len, "%s ", argv[i]);
} }
/* Now, read in one line at a time from stdin, and store this /* Now, read in one line at a time from stdin, and store this
* line to be used later as an argument to the command */ * line to be used later as an argument to the command */
while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) { while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) {
FILE *cmd_output = NULL; FILE *cmd_output;
char *output_line = NULL; char *output_line;
char *execstr = NULL; char *execstr;
/* eat the newline off the filename. */ /* eat the newline off the filename. */
chomp(file_to_act_on); chomp(file_to_act_on);
/* eat blank lines */ /* eat blank lines */
if (strlen(file_to_act_on) == 0) if (file_to_act_on[0] == 0)
continue; continue;
/* assemble the command and execute it */ /* assemble the command and execute it */
execstr = xstrndup ( cmd_to_be_executed, xstrlen(cmd_to_be_executed) + xstrlen(file_to_act_on)); bb_asprintf(&execstr, "%s%s", cmd_to_be_executed, file_to_act_on);
strcat(execstr, file_to_act_on);
cmd_output = popen(execstr, "r"); cmd_output = popen(execstr, "r");
if (cmd_output == NULL) if (cmd_output == NULL)