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-rw-r--r--findutils/xargs.c129
1 files changed, 115 insertions, 14 deletions
diff --git a/findutils/xargs.c b/findutils/xargs.c
index 298c000..27f8335 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -3,6 +3,7 @@
* Only "-prt" options are supported in this version of xargs.
*
* (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
+ * (C) 2003 by Glenn McGrath <bug1@optushome.com.au>
*
* Special thanks Mark Whitley for stimul to rewrote :)
*
@@ -20,12 +21,28 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * BUGS: -p doesnt accept user input
+ *
+ * Reference:
+ * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
+ *
+ *
+ * BUGS:
+ * p option doesnt accept user input, should read input from /dev/tty
+ *
+ * E option doesnt allow spaces before argument
+ *
+ * xargs should terminate if an invocation of a constructed command line
+ * returns an exit status of 255.
+ *
+ * exit value of isnt correct
+ *
+ * doesnt print quoted string properly
*
*/
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
@@ -33,7 +50,6 @@
#include <sys/wait.h>
#include "busybox.h"
-
/*
This function have special algorithm.
Don`t use fork and include to main!
@@ -65,17 +81,42 @@ static void xargs_exec(char * const * args)
#define OPT_VERBOSE 0x2
#define OPT_INTERACTIVE 0x4
-#define OPT_NO_EMPTY 0x8
+#define OPT_TERMINATE 0x8
+#define OPT_UPTO_NUMBER 0x10
+#define OPT_UPTO_SIZE 0x20
+#define OPT_EOF_STRING 0x40
int xargs_main(int argc, char **argv)
{
- char *file_to_act_on;
- char **args;
- int i, a;
+ char *s_max_args = NULL;
+ char *s_line_size = NULL;
unsigned long flg;
+ char *eof_string = "_";
+ int line_size = LINE_MAX;
+ unsigned int max_args = LINE_MAX / 2;
+
+ char *line_buffer = NULL;
+ char *line_buffer_ptr_ptr;
+ char *old_arg = NULL;
+
+ char **args;
+ char *args_entry_ptr;
+
+ int i;
+ int a;
+
+
bb_opt_complementaly = "pt";
- flg = bb_getopt_ulflags(argc, argv, "+tpr");
+
+ flg = bb_getopt_ulflags(argc, argv, "+tpxn:s:E::", &s_max_args, &s_line_size, &eof_string);
+
+ if (s_max_args) {
+ max_args = bb_xgetularg10(s_max_args);
+ }
+ if (s_line_size) {
+ line_size = bb_xgetularg10(s_line_size);
+ }
a = argc - optind;
argv += optind;
@@ -88,20 +129,81 @@ int xargs_main(int argc, char **argv)
args = xcalloc(a + 2, sizeof(char *));
/* Store the command to be executed (taken from the command line) */
- for (i = 0; i < a; i++)
+ for (i = 0; i < a; i++) {
+ line_size -= strlen(*argv) + 1;
args[i] = *argv++;
+ }
+ if (line_size < 1) {
+ bb_error_msg_and_die("can not fit single argument within argument list size limit");
+ }
+
+ args[i] = xmalloc(line_size);
+ args_entry_ptr = args[i];
/* Now, read in one line at a time from stdin, and store this
* line to be used later as an argument to the command */
- while ((file_to_act_on = bb_get_chomped_line_from_file(stdin)) != NULL) {
- if(file_to_act_on[0] != 0 || (flg & OPT_NO_EMPTY) == 0) {
- args[a] = file_to_act_on[0] ? file_to_act_on : NULL;
+ do {
+ char *line_buffer_ptr = NULL;
+ unsigned int arg_count = 0;
+ unsigned int arg_size = 0;
+
+ *args_entry_ptr = '\0';
+
+ /* Get the required number of entries from stdin */
+ do {
+ /* (Re)fill the line buffer */
+ if (line_buffer == NULL) {
+ line_buffer = bb_get_chomped_line_from_file(stdin);
+ if (line_buffer == NULL) {
+ /* EOF, exit outer loop */
+ break;
+ }
+ line_buffer_ptr = strtok_r(line_buffer, " \t", &line_buffer_ptr_ptr);
+ } else {
+ if (old_arg) {
+ line_buffer_ptr = old_arg;
+ old_arg = NULL;
+ } else {
+ line_buffer_ptr = strtok_r(NULL, " \t", &line_buffer_ptr_ptr);
+ }
+ }
+ /* If no arguments left go back and get another line */
+ if (line_buffer_ptr == NULL) {
+ free(line_buffer);
+ line_buffer = NULL;
+ continue;
+ }
+
+ if (eof_string && (strcmp(line_buffer_ptr, eof_string) == 0)) {
+ /* logical EOF, exit outer loop */
+ line_buffer = NULL;
+ break;
+ }
+
+ /* Check the next argument will fit */
+ arg_size += 1 + strlen(line_buffer_ptr);
+ if (arg_size > line_size) {
+ if ((arg_count == 0) || ((flg & OPT_TERMINATE) && (arg_count != max_args))){
+ bb_error_msg_and_die("argument line too long");
+ }
+ old_arg = line_buffer_ptr;
+ break;
+ }
+
+ /* Add the entry to our pre-allocated space */
+ strcat(args_entry_ptr, line_buffer_ptr);
+ strcat(args_entry_ptr, " ");
+ arg_count++;
+ } while (arg_count < max_args);
+
+ if (*args_entry_ptr != '\0') {
if(flg & (OPT_VERBOSE | OPT_INTERACTIVE)) {
for(i=0; args[i]; i++) {
if(i)
fputc(' ', stderr);
fputs(args[i], stderr);
}
+
fputs(((flg & OPT_INTERACTIVE) ? " ?..." : "\n"), stderr);
}
@@ -109,9 +211,8 @@ int xargs_main(int argc, char **argv)
xargs_exec(args);
}
}
- /* clean up */
- free(file_to_act_on);
- }
+ } while (line_buffer);
+
#ifdef CONFIG_FEATURE_CLEAN_UP
free(args);
#endif