Vods versions of xargs

1 files changed, 510 insertions, 191 deletions

diff --git a/findutils/xargs.c b/findutils/xargs.c
index 1af42384b..8bab44623 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -1,11 +1,13 @@
 /*
  * Mini xargs implementation for busybox
- * Only "-prt" options are supported in this version of xargs.
+ * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
  *
- * (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
- * (C) 2003 by Glenn McGrath <bug1@optushome.com.au>
+ * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
  *
- * Special thanks Mark Whitley for stimul to rewrote :)
+ * Special thanks
+ * - Mark Whitley and Glenn McGrath for stimul to rewrote :)
+ * - Mike Rendell <michael@cs.mun.ca>
+ * and David MacKenzie <djm@gnu.ai.mit.edu>.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -21,15 +23,6 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  *
- *
- * Reference:
- *	http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
- *
- *
- * BUGS:
- *      - E option doesnt allow spaces before argument
- *      - exit value of isnt correct 
- *      - doesnt print quoted string properly
  */
 
 #include <stdio.h>
@@ -38,224 +31,550 @@
 #include <unistd.h>
 #include <getopt.h>
 #include <errno.h>
+#include <fcntl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-
 #include "busybox.h"
 
+/* COMPAT:  SYSV version defaults size (and has a max value of) to 470.
+   We try to make it as large as possible. */
+#if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
+#define ARG_MAX sysconf (_SC_ARG_MAX)
+#endif
+#ifndef ARG_MAX
+#define ARG_MAX 470
+#endif
+
+
+#ifdef TEST
+# ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+#  define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+# endif
+# ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
+#  define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
+# endif
+# ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+#  define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+# endif
+# ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+#  define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+# endif
+#endif
+
 /*
    This function have special algorithm.
    Don`t use fork and include to main!
 */
-static int xargs_exec(char **args)
+static int
+xargs_exec (char *const *args)
 {
-	pid_t p;
-	volatile int exec_errno;	/* shared vfork stack */
-	
-	exec_errno = 0;
-	p = vfork();
-	if (p < 0) {
-		bb_perror_msg_and_die("vfork");
-	} else if (p == 0) {
-		/* vfork -- child */
-		execvp(args[0], args);
-		exec_errno = errno;	/* set error to shared stack */
-		_exit(1);
+  pid_t p;
+  volatile int exec_errno = 0;          /* shared vfork stack */
+
+  if ((p = vfork ()) >= 0) {
+	if (p == 0) {
+	  /* vfork -- child */
+	  execvp (args[0], args);
+	  exec_errno = errno;           /* set error to shared stack */
+	  _exit (1);
 	} else {
-		/* vfork -- parent */
-		int status;
+	  /* vfork -- parent */
+	  int status;
 
-		while (wait(&status) == (pid_t) - 1) {
-			if (errno != EINTR) {
-				break;
-			}
+	  while (wait (&status) == (pid_t) - 1)
+		if (errno != EINTR)
+		  break;
+	  if (exec_errno) {
+		errno = exec_errno;
+		bb_perror_msg ("%s", args[0]);
+		return exec_errno == ENOENT ? 127 : 126;
+	  } else {
+		if (WEXITSTATUS (status) == 255) {
+		  bb_error_msg ("%s: exited with status 255; aborting", args[0]);
+		  return 124;
 		}
-
-		if (exec_errno) {
-			errno = exec_errno;
-			bb_perror_msg("%s", args[0]);
-			return exec_errno == ENOENT ? 127 : 126;
-		} else if (WEXITSTATUS(status) == 255) {
-			bb_error_msg("%s: exited with status 255; aborting", args[0]);
-			return 124;
-		} else if (WIFSTOPPED(status)) {
-			bb_error_msg("%s: stopped by signal %d", args[0],
-						 WSTOPSIG(status));
-			return 125;
-		} else if (WIFSIGNALED(status)) {
-			bb_error_msg("%s: terminated by signal %d", args[0],
-						 WTERMSIG(status));
-			return 125;
-		} else if (WEXITSTATUS(status)) {
-			return 123;
-		} else {
-			return 0;
+		if (WIFSTOPPED (status)) {
+		  bb_error_msg ("%s: stopped by signal %d", args[0],
+						WSTOPSIG (status));
+		  return 125;
+		}
+		if (WIFSIGNALED (status)) {
+		  bb_error_msg ("%s: terminated by signal %d", args[0],
+						WTERMSIG (status));
+		  return 125;
 		}
+		if (WEXITSTATUS (status) != 0)
+		  return 123;
+		return 0;
+	  }
 	}
+  } else {
+	bb_perror_msg_and_die ("vfork");
+  }
 }
 
-#define OPT_VERBOSE	0x1
-#define OPT_TERMINATE	0x2
-#define OPT_UPTO_NUMBER	0x4
-#define OPT_UPTO_SIZE	0x8
-#define OPT_EOF_STRING	0x10
 
-int xargs_main(int argc, char **argv)
+typedef struct xlist_s {
+	char *data;
+	size_t lenght;
+	struct xlist_s *link;
+} xlist_t;
+
+static int eof_stdin_detected;
+
+#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
+#define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
+		    || (c) == '\f' || (c) == '\v')
+
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
+static xlist_t *
+process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
 {
-#ifdef CONFIG_FEATURE_XARGS_FANCY
-	char *s_max_args = NULL;
-	char *s_line_size = NULL;
-#endif
-	char *eof_string = "_";
-	unsigned long flg;
+#define NORM      0
+#define QUOTE     1
+#define BACKSLASH 2
+#define SPACE     4
+
+  char *s = NULL;       /* start word */
+  char *p = NULL;       /* pointer to end word */
+  char q = 0;           /* quote char */
+  char state = NORM;
+  char eof_str_detected = 0;
+  size_t line_l = 0;    /* size loaded args line */
+  int c;                /* current char */
+  xlist_t *cur;
+  xlist_t *prev;
+
+  for(prev = cur = list_arg; cur; cur = cur->link) {
+    line_l += cur->lenght;  /* previous allocated */
+    if(prev != cur)
+	prev = prev->link;
+  }
+
+  while(!eof_stdin_detected) {
+	c = getchar();
+	if(c == EOF) {
+	    eof_stdin_detected++;
+	    if(s)
+		goto unexpected_eof;
+	    break;
+	}
+	if(eof_str_detected)
+	    continue;
+	if (state == BACKSLASH) {
+	    state = NORM;
+	    goto set;
+	} else if (state == QUOTE) {
+	    if (c == q) {
+		q = 0;
+		state = NORM;
+	    } else {
+		goto set;
+	    }
+	} else /* if(state == NORM) */ {
+	    if (ISSPACE (c)) {
+		if (s) {
+unexpected_eof:
+		  state = SPACE;
+		  c = 0;
+		  goto set;
+		}
+	    } else {
+		if (s == NULL)
+		    s = p = buf;
+		if (c == '\\') {
+		    state = BACKSLASH;
+		} else if (c == '\'' || c == '"') {
+		    q = c;
+		    state = QUOTE;
+		} else {
+set:
+		    if( (p-buf) >= mc)
+			    bb_error_msg_and_die ("argument line too long");
+		    *p++ = c;
+		}
+	    }
+	}
+	if (state == SPACE) {    /* word's delimiter or EOF detected */
+	  if (q)
+	    bb_error_msg_and_die ("unmatched %s quote",
+				    q == '\'' ? "single" : "double");
+	  /* word loaded */
+	  if(eof_str) {
+	    eof_str_detected = strcmp(s, eof_str) == 0;
+	  }
+	  if(!eof_str_detected) {
+	    size_t lenght = (p-buf);
 
-	int line_size;
-	unsigned int max_args = LINE_MAX;
+	    cur = xmalloc(sizeof(xlist_t) + lenght);
+	    cur->data = memcpy(cur + 1, s, lenght);
+	    cur->lenght = lenght;
+	    cur->link = NULL;
+	    if(prev == NULL) {
+		list_arg = cur;
+	    } else {
+		prev->link = cur;
+	    }
+	    prev = cur;
+	    line_l += lenght;
+	    if(line_l > mc) {
+		/* stop memory usage :-) */
+		break;
+	    }
+	  }
+	  s = NULL;
+	  state = NORM;
+	}
+  }
+  return list_arg;
+}
+#else
+/* The variant is unsupport single, double quotes and backslash */
+static xlist_t *
+process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
+{
 
-	char *line_buffer = NULL;
-	char *line_buffer_ptr_ptr;
-	char *old_arg = NULL;
+  int c;                /* current char */
+  int eof_str_detected = 0;
+  char *s = NULL;       /* start word */
+  char *p = NULL;       /* pointer to end word */
+  size_t line_l = 0;    /* size loaded args line */
+  xlist_t *cur;
+  xlist_t *prev;
 
-	char **args;
-	char *args_entry_ptr;
+  for(prev = cur = list_arg; cur; cur = cur->link) {
+    line_l += cur->lenght;  /* previous allocated */
+    if(prev != cur)
+	prev = prev->link;
+  }
 
-	int i;
-	int a;
+  while(!eof_stdin_detected) {
+	c = getchar();
+	if(c == EOF) {
+	    eof_stdin_detected++;
+	}
+	if(eof_str_detected)
+	    continue;
+	if (c == EOF || ISSPACE (c)) {
+	    if(s == NULL)
+		continue;
+	    c = EOF;
+	}
+	if (s == NULL)
+	    s = p = buf;
+	if( (p-buf) >= mc)
+	    bb_error_msg_and_die ("argument line too long");
+	*p++ = c == EOF ? 0 : c;
+	if (c == EOF) {    /* word's delimiter or EOF detected */
+	    /* word loaded */
+	    if(eof_str) {
+		eof_str_detected = strcmp(s, eof_str) == 0;
+	    }
+	    if(!eof_str_detected) {
+		size_t lenght = (p-buf);
 
-#if 0
-	/* Default to maximum line length */
-	if (LINE_MAX > ARG_MAX - 2048) {
-		/* Minimum command line length */
-		line_size = LINE_MAX;
-	} else {
-		/* Maximum command line length */
-		line_size = ARG_MAX = 2048;
+		cur = xmalloc(sizeof(xlist_t) + lenght);
+		cur->data = memcpy(cur + 1, s, lenght);
+		cur->lenght = lenght;
+		cur->link = NULL;
+		if(prev == NULL) {
+		    list_arg = cur;
+		} else {
+		    prev->link = cur;
+		}
+		prev = cur;
+		line_l += lenght;
+		if(line_l > mc) {
+		    /* stop memory usage :-) */
+		    break;
+		}
+		s = NULL;
+	    }
 	}
+  }
+  return list_arg;
+}
+#endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
+
+
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+/* Prompt the user for a response, and
+   if the user responds affirmatively, return true;
+   otherwise, return false. Used "/dev/tty", not stdin. */
+static int
+xargs_ask_confirmation (void)
+{
+  static FILE *tty_stream;
+  int c, savec;
+
+  if (!tty_stream) {
+      tty_stream = fopen ("/dev/tty", "r");
+      if (!tty_stream)
+	bb_perror_msg_and_die ("/dev/tty");
+      /* pranoidal security by vodz */
+      fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
+  }
+  fputs (" ?...", stderr);
+  fflush (stderr);
+  c = savec = getc (tty_stream);
+  while (c != EOF && c != '\n')
+    c = getc (tty_stream);
+  if (savec == 'y' || savec == 'Y')
+    return 1;
+  return 0;
+}
+# define OPT_INC_P 1
 #else
-	line_size = LINE_MAX;
-#endif
-	
-#ifndef CONFIG_FEATURE_XARGS_FANCY
-	flg = bb_getopt_ulflags(argc, argv, "+t");
+# define OPT_INC_P 0
+# define xargs_ask_confirmation() 1
+#endif                  /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
+
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+# define OPT_INC_X 1
 #else
-	flg = bb_getopt_ulflags(argc, argv, "+txn:s:E::", &s_max_args, &s_line_size, &eof_string);
+# define OPT_INC_X 0
+#endif
 
-	if (s_line_size) {
-		line_size =	bb_xgetularg10_bnd(s_max_args, 1, line_size);
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+static xlist_t *
+process0_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
+{
+  int c;                /* current char */
+  char *s = NULL;       /* start word */
+  char *p = NULL;       /* pointer to end word */
+  size_t line_l = 0;    /* size loaded args line */
+  xlist_t *cur;
+  xlist_t *prev;
+
+  for(prev = cur = list_arg; cur; cur = cur->link) {
+    line_l += cur->lenght;  /* previous allocated */
+    if(prev != cur)
+	prev = prev->link;
+  }
+
+  while(!eof_stdin_detected) {
+	c = getchar();
+	if(c == EOF) {
+	    eof_stdin_detected++;
+	    if(s == NULL)
+		break;
+	    c = 0;
 	}
-	if (s_max_args) {
-		max_args = bb_xgetularg10(s_max_args);
+	if (s == NULL)
+	    s = p = buf;
+	if( (p-buf) >= mc)
+	    bb_error_msg_and_die ("argument line too long");
+	*p++ = c;
+	if (c == 0) {    /* word's delimiter or EOF detected */
+	    /* word loaded */
+		size_t lenght = (p-buf);
+
+		cur = xmalloc(sizeof(xlist_t) + lenght);
+		cur->data = memcpy(cur + 1, s, lenght);
+		cur->lenght = lenght;
+		cur->link = NULL;
+		if(prev == NULL) {
+		    list_arg = cur;
+		} else {
+		    prev->link = cur;
+		}
+		prev = cur;
+		line_l += lenght;
+		if(line_l > mc) {
+		    /* stop memory usage :-) */
+		    break;
+		}
+		s = NULL;
 	}
+  }
+  return list_arg;
+}
+# define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
+# define OPT_INC_0 1    /* future use */
+#else
+# define OPT_INC_0 0    /* future use */
+# define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
+#endif                  /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
+
+
+#define OPT_VERBOSE     (1<<0)
+#define OPT_NO_EMPTY    (1<<1)
+#define OPT_UPTO_NUMBER (1<<2)
+#define OPT_UPTO_SIZE   (1<<3)
+#define OPT_EOF_STRING  (1<<4)
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+#define OPT_INTERACTIVE (1<<5)
+#else
+#define OPT_INTERACTIVE (0)     /* require for algorithm &| */
 #endif
+#define OPT_TERMINATE   (1<<(5+OPT_INC_P))
+#define OPT_ZEROTERM    (1<<(5+OPT_INC_P+OPT_INC_X))
+/* next future
+#define OPT_NEXT_OTHER  (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
+*/
 
-	a = argc - optind;
-	argv += optind;
-	if (a == 0) {
-		/* default behavior is to echo all the filenames */
-		*argv = "echo";
-		a++;
-	}
-	/* allocating pointers for execvp: a*arg, arg from stdin, NULL */
-	args = xcalloc(a + 2, sizeof(char *));
+int
+xargs_main (int argc, char **argv)
+{
+  char **args;
+  int i, a, n;
+  xlist_t *list = NULL;
+  xlist_t *cur;
+  int child_error = 0;
+  char *max_args, *max_chars;
+  int n_max_arg;
+  size_t n_chars = 0;
+  long orig_arg_max;
+  const char *eof_str = "_";
+  unsigned long opt;
+  size_t n_max_chars;
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+  xlist_t * (*read_args) (xlist_t *, const char *, size_t, char *) = process_stdin;
+#endif
 
-	/* Store the command to be executed (taken from the command line) */
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+  bb_opt_complementaly = "pt";
+#endif
+
+  opt = bb_getopt_ulflags (argc, argv, "+trn:s:e::"
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+					"p"
+#endif
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+					"x"
+#endif
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+					"0"
+#endif
+					, &max_args, &max_chars, &eof_str);
+
+  a = argc - optind;
+  argv += optind;
+  if (a == 0) {
+	/* default behavior is to echo all the filenames */
+	*argv = "echo";
+	a++;
+  }
+
+  orig_arg_max = ARG_MAX;
+  if (orig_arg_max == -1)
+    orig_arg_max = LONG_MAX;
+  orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048.  */
+  if ((opt & OPT_UPTO_SIZE)) {
+	n_max_chars = bb_xgetularg10_bnd (max_chars, 1, orig_arg_max);
 	for (i = 0; i < a; i++) {
-		line_size -= strlen(*argv) + 1;
-		args[i] = *argv++;
+	  n_chars += strlen (*argv) + 1;
 	}
-	if (line_size < 1) {
-		bb_error_msg_and_die("can not fit single argument within argument list size limit");
+	if (n_max_chars < n_chars) {
+	  bb_error_msg_and_die
+		("can not fit single argument within argument list size limit");
 	}
+	n_max_chars -= n_chars;
+  } else {
+    /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
+     have it at 1 meg).  Things will work fine with a large ARG_MAX but it
+     will probably hurt the system more than it needs to; an array of this
+     size is allocated.  */
+    if (orig_arg_max > 20 * 1024)
+	orig_arg_max = 20 * 1024;
+    n_max_chars = orig_arg_max;
+  }
+  max_chars = xmalloc(n_max_chars);
 
-	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 */
-	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;
-			}
-
-#ifdef CONFIG_FEATURE_XARGS_FANCY
-			if (eof_string && (strcmp(line_buffer_ptr, eof_string) == 0)) {
-#else
-			if (strcmp(line_buffer_ptr, eof_string) == 0) {
+  if ((opt & OPT_UPTO_NUMBER)) {
+	n_max_arg = bb_xgetularg10_bnd (max_args, 1, INT_MAX);
+  } else {
+	n_max_arg = n_max_chars;
+  }
+
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+  if(opt & OPT_ZEROTERM)
+    read_args = process0_stdin;
 #endif
-				/* 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)
-#ifdef CONFIG_FEATURE_XARGS_FANCY
-					|| ((flg & OPT_TERMINATE) && (arg_count != max_args))) {
+
+  while ((list = READ_ARGS(list, eof_str, n_max_chars, max_chars)) != NULL
+					|| (opt & OPT_NO_EMPTY) == 0) {
+	opt |= OPT_NO_EMPTY;
+	n = 0;
+	n_chars = 0;
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+	for (cur = list; cur; ) {
+	    n_chars += cur->lenght;
+	    n++;
+	    cur = cur->link;
+	    if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
+		if (opt & OPT_TERMINATE)
+		      bb_error_msg_and_die ("argument list too long");
+		break;
+	    }
+	}
 #else
-					) {
-#endif
-					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);
-
-		/* Remove the last space */
-		args_entry_ptr[arg_size - 1] = '\0';
-
-		if (*args_entry_ptr != '\0') {
-			if (flg & OPT_VERBOSE) {
-				for (i = 0; args[i]; i++) {
-					if (i) {
-						fputc(' ', stderr);
-					}
-					fputs(args[i], stderr);
-				}
-				fputc('\n', stderr);
-			}
-			xargs_exec(args);
+	for (cur = list; cur; cur = cur->link) {
+	    n_chars += cur->lenght;
+	    n++;
+	    if (n_chars > n_max_chars || n == n_max_arg) {
+		break;
+	    }
+	}
+#endif  /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
+
+	/* allocating pointers for execvp:
+	   a*arg, n*arg from stdin, NULL */
+	args = xcalloc (n + a + 1, sizeof (char *));
+
+	/* Store the command to be executed
+	   (taken from the command line) */
+	for (i = 0; i < a; i++)
+		args[i] = argv[i];
+	/* (taken from stdin) */
+	for (cur = list; n; cur = cur->link) {
+		args[i++] = cur->data;
+		n--;
+	}
+
+	if ((opt & (OPT_INTERACTIVE|OPT_VERBOSE))) {
+		for (i = 0; args[i]; i++) {
+		  if (i)
+			fputc (' ', stderr);
+		  fputs (args[i], stderr);
 		}
-	} while (line_buffer);
+		if((opt & OPT_INTERACTIVE) == 0)
+		    fputc ('\n', stderr);
+	}
+	if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation () != 0) {
+		child_error = xargs_exec (args);
+	}
 
+	/* clean up */
+	for (i = a; args[i]; i++) {
+		cur = list;
+		list = list->link;
+		free (cur);
+	}
+	free (args);
+	if (child_error > 0 && child_error != 123) {
+	    break;
+	}
+  }
 #ifdef CONFIG_FEATURE_CLEAN_UP
-	free(args);
+  free(max_chars);
 #endif
-	return 0;
+  return child_error;
+}
+
+
+#ifdef TEST
+
+const char *bb_applet_name = "debug stuff usage";
+
+void bb_show_usage(void)
+{
+  fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n", bb_applet_name);
+  exit(1);
+}
+
+int main(int argc, char **argv)
+{
+    return xargs_main(argc, argv);
 }
+#endif  /* TEST */