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 */