Add argp implementation

Argp is an advanced support for parsing unix-style argument vectors.
In addition to the common getopt interface, it provides automatic
response
to `--help' and `--version' options and use of custom parser in
conjunction
with argp native option parser, among others.
Argp support is required by elfutils package and prelink.

In uClibc argp functionalities has been moved from C library to
libuargp.so
Further the libc.so linker script contains an AS_NEEDED entry so that
it doesn't need to link libuargp.so explicitely.

Disable argp test if feature disabled.

Signed-off-by: Salvatore Cro <salvatore.cro@st.com>
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

1 files changed, 1882 insertions, 0 deletions

diff --git a/libuargp/argp-help.c b/libuargp/argp-help.c
new file mode 100644
index 000000000..58a5e6e16
--- /dev/null
+++ b/libuargp/argp-help.c
@@ -0,0 +1,1882 @@
+/* Hierarchial argument parsing help output
+   Copyright (C) 1995-2003, 2004, 2005, 2006, 2007
+   Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Miles Bader <miles at gnu.ai.mit.edu>.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.
+
+   Modified for uClibc by: Salvatore Cro <salvatore.cro at st.com>
+*/
+
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE   1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+/* AIX requires this to be the first thing in the file.  */
+#ifndef __GNUC__
+# if HAVE_ALLOCA_H || defined _LIBC
+#  include <alloca.h>
+# else
+#  ifdef _AIX
+#pragma alloca
+#  else
+#   ifndef alloca /* predefined by HP cc +Olibcalls */
+char *alloca ();
+#   endif
+#  endif
+# endif
+#endif
+
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <stdarg.h>
+#include <ctype.h>
+#include <limits.h>
+#ifdef _LIBC
+# include <wchar.h>
+#endif
+
+#include <features.h>
+#ifndef _
+/* This is for other GNU distributions with internationalized messages.  */
+# if (defined HAVE_LIBINTL_H || defined _LIBC) && defined __UCLIBC_HAS_GETTEXT_AWARENESS__
+#  include <libintl.h>
+#  ifdef _LIBC
+#   undef dgettext
+#   define dgettext(domain, msgid) \
+  INTUSE(__dcgettext) (domain, msgid, LC_MESSAGES)
+#  endif
+# else
+#  define dgettext(domain, msgid) (msgid)
+# endif
+#endif
+
+#ifndef _LIBC
+# if HAVE_STRERROR_R
+#  if !HAVE_DECL_STRERROR_R
+char *strerror_r (int errnum, char *buf, size_t buflen);
+#  endif
+# else
+#  if !HAVE_DECL_STRERROR
+char *strerror (int errnum);
+#  endif
+# endif
+#endif
+
+#include <argp.h>
+#include "argp-fmtstream.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+#ifndef SIZE_MAX
+# define SIZE_MAX ((size_t) -1)
+#endif
+
+/* User-selectable (using an environment variable) formatting parameters.
+
+   These may be specified in an environment variable called `ARGP_HELP_FMT',
+   with a contents like:  VAR1=VAL1,VAR2=VAL2,BOOLVAR2,no-BOOLVAR2
+   Where VALn must be a positive integer.  The list of variables is in the
+   UPARAM_NAMES vector, below.  */
+
+/* Default parameters.  */
+#define DUP_ARGS      0                /* True if option argument can be duplicated. */
+#define DUP_ARGS_NOTE 1                /* True to print a note about duplicate args. */
+#define SHORT_OPT_COL 2                /* column in which short options start */
+#define LONG_OPT_COL  6                /* column in which long options start */
+#define DOC_OPT_COL   2                /* column in which doc options start */
+#define OPT_DOC_COL  29                /* column in which option text starts */
+#define HEADER_COL    1                /* column in which group headers are printed */
+#define USAGE_INDENT 12                /* indentation of wrapped usage lines */
+#define RMARGIN      79                /* right margin used for wrapping */
+
+/* User-selectable (using an environment variable) formatting parameters.
+   They must all be of type `int' for the parsing code to work.  */
+struct uparams
+{
+  /* If true, arguments for an option are shown with both short and long
+     options, even when a given option has both, e.g. `-x ARG, --longx=ARG'.
+     If false, then if an option has both, the argument is only shown with
+     the long one, e.g., `-x, --longx=ARG', and a message indicating that
+     this really means both is printed below the options.  */
+  int dup_args;
+
+  /* This is true if when DUP_ARGS is false, and some duplicate arguments have
+     been suppressed, an explanatory message should be printed.  */
+  int dup_args_note;
+
+  /* Various output columns.  */
+  int short_opt_col;
+  int long_opt_col;
+  int doc_opt_col;
+  int opt_doc_col;
+  int header_col;
+  int usage_indent;
+  int rmargin;
+};
+
+/* This is a global variable, as user options are only ever read once.  */
+static struct uparams uparams = {
+  DUP_ARGS, DUP_ARGS_NOTE,
+  SHORT_OPT_COL, LONG_OPT_COL, DOC_OPT_COL, OPT_DOC_COL, HEADER_COL,
+  USAGE_INDENT, RMARGIN
+};
+
+/* A particular uparam, and what the user name is.  */
+struct uparam_name
+{
+  const char name[14];         /* User name.  */
+  bool is_bool;                        /* Whether it's `boolean'.  */
+  uint8_t uparams_offs;                /* Location of the (int) field in UPARAMS.  */
+};
+
+/* The name-field mappings we know about.  */
+static const struct uparam_name uparam_names[] =
+{
+  { "dup-args",       true, offsetof (struct uparams, dup_args) },
+  { "dup-args-note",  true, offsetof (struct uparams, dup_args_note) },
+  { "short-opt-col",  false, offsetof (struct uparams, short_opt_col) },
+  { "long-opt-col",   false, offsetof (struct uparams, long_opt_col) },
+  { "doc-opt-col",    false, offsetof (struct uparams, doc_opt_col) },
+  { "opt-doc-col",    false, offsetof (struct uparams, opt_doc_col) },
+  { "header-col",     false, offsetof (struct uparams, header_col) },
+  { "usage-indent",   false, offsetof (struct uparams, usage_indent) },
+  { "rmargin",        false, offsetof (struct uparams, rmargin) }
+};
+#define nuparam_names (sizeof (uparam_names) / sizeof (uparam_names[0]))
+
+/* Read user options from the environment, and fill in UPARAMS appropiately.  */
+static void
+fill_in_uparams (const struct argp_state *state)
+{
+  const char *var = getenv ("ARGP_HELP_FMT");
+
+#define SKIPWS(p) do { while (isspace (*p)) p++; } while (0);
+
+  if (var)
+    /* Parse var. */
+    while (*var)
+      {
+       SKIPWS (var);
+
+       if (isalpha (*var))
+         {
+           size_t var_len;
+           const struct uparam_name *un;
+           int unspec = 0, val = 0;
+           const char *arg = var;
+
+           while (isalnum (*arg) || *arg == '-' || *arg == '_')
+             arg++;
+           var_len = arg - var;
+
+           SKIPWS (arg);
+
+           if (*arg == '\0' || *arg == ',')
+             unspec = 1;
+           else if (*arg == '=')
+             {
+               arg++;
+               SKIPWS (arg);
+             }
+
+           if (unspec)
+             {
+               if (var[0] == 'n' && var[1] == 'o' && var[2] == '-')
+                 {
+                   val = 0;
+                   var += 3;
+                   var_len -= 3;
+                 }
+               else
+                 val = 1;
+             }
+           else if (isdigit (*arg))
+             {
+               val = atoi (arg);
+               while (isdigit (*arg))
+                 arg++;
+               SKIPWS (arg);
+             }
+
+           un = uparam_names;
+           size_t u;
+           for (u = 0; u < nuparam_names; ++un, ++u)
+             if (strlen (un->name) == var_len
+                 && strncmp (var, un->name, var_len) == 0)
+               {
+                 if (unspec && !un->is_bool)
+                   argp_failure (state, 0, 0,
+                                   dgettext (state == NULL ? NULL
+                                             : state->root_argp->argp_domain,
+                                             "\
+%.*s: ARGP_HELP_FMT parameter requires a value"),
+                                   (int) var_len, var);
+                 else
+                   *(int *)((char *)&uparams + un->uparams_offs) = val;
+                 break;
+               }
+           if (u == nuparam_names)
+             argp_failure (state, 0, 0,
+                             dgettext (state == NULL ? NULL
+                                       : state->root_argp->argp_domain, "\
+%.*s: Unknown ARGP_HELP_FMT parameter"),
+                             (int) var_len, var);
+
+           var = arg;
+           if (*var == ',')
+             var++;
+         }
+       else if (*var)
+         {
+           argp_failure (state, 0, 0,
+                           dgettext (state == NULL ? NULL
+                                     : state->root_argp->argp_domain,
+                                     "Garbage in ARGP_HELP_FMT: %s"), var);
+           break;
+         }
+      }
+}
+
+/* Returns true if OPT hasn't been marked invisible.  Visibility only affects
+   whether OPT is displayed or used in sorting, not option shadowing.  */
+#define ovisible(opt) (! ((opt)->flags & OPTION_HIDDEN))
+
+/* Returns true if OPT is an alias for an earlier option.  */
+#define oalias(opt) ((opt)->flags & OPTION_ALIAS)
+
+/* Returns true if OPT is an documentation-only entry.  */
+#define odoc(opt) ((opt)->flags & OPTION_DOC)
+
+/* Returns true if OPT is the end-of-list marker for a list of options.  */
+#define oend(opt) __option_is_end (opt)
+
+/* Returns true if OPT has a short option.  */
+#define oshort(opt) __option_is_short (opt)
+
+/*
+   The help format for a particular option is like:
+
+     -xARG, -yARG, --long1=ARG, --long2=ARG        Documentation...
+
+   Where ARG will be omitted if there's no argument, for this option, or
+   will be surrounded by "[" and "]" appropiately if the argument is
+   optional.  The documentation string is word-wrapped appropiately, and if
+   the list of options is long enough, it will be started on a separate line.
+   If there are no short options for a given option, the first long option is
+   indented slighly in a way that's supposed to make most long options appear
+   to be in a separate column.
+
+   For example, the following output (from ps):
+
+     -p PID, --pid=PID          List the process PID
+        --pgrp=PGRP            List processes in the process group PGRP
+     -P, -x, --no-parent        Include processes without parents
+     -Q, --all-fields           Don't elide unusable fields (normally if there's
+                               some reason ps can't print a field for any
+                               process, it's removed from the output entirely)
+     -r, --reverse, --gratuitously-long-reverse-option
+                               Reverse the order of any sort
+        --session[=SID]        Add the processes from the session SID (which
+                               defaults to the sid of the current process)
+
+    Here are some more options:
+     -f ZOT, --foonly=ZOT       Glork a foonly
+     -z, --zaza                 Snit a zar
+
+     -?, --help                 Give this help list
+        --usage                Give a short usage message
+     -V, --version              Print program version
+
+   The struct argp_option array for the above could look like:
+
+   {
+     {"pid",       'p',      "PID",  0, "List the process PID"},
+     {"pgrp",      OPT_PGRP, "PGRP", 0, "List processes in the process group PGRP"},
+     {"no-parent", 'P',              0,     0, "Include processes without parents"},
+     {0,           'x',       0,     OPTION_ALIAS},
+     {"all-fields",'Q',       0,     0, "Don't elide unusable fields (normally"
+                                        " if there's some reason ps can't"
+                                       " print a field for any process, it's"
+                                        " removed from the output entirely)" },
+     {"reverse",   'r',       0,     0, "Reverse the order of any sort"},
+     {"gratuitously-long-reverse-option", 0, 0, OPTION_ALIAS},
+     {"session",   OPT_SESS,  "SID", OPTION_ARG_OPTIONAL,
+                                        "Add the processes from the session"
+                                       " SID (which defaults to the sid of"
+                                       " the current process)" },
+
+     {0,0,0,0, "Here are some more options:"},
+     {"foonly", 'f', "ZOT", 0, "Glork a foonly"},
+     {"zaza", 'z', 0, 0, "Snit a zar"},
+
+     {0}
+   }
+
+   Note that the last three options are automatically supplied by argp_parse,
+   unless you tell it not to with ARGP_NO_HELP.
+
+*/
+
+/* Returns true if CH occurs between BEG and END.  */
+static int
+find_char (char ch, char *beg, char *end)
+{
+  while (beg < end)
+    if (*beg == ch)
+      return 1;
+    else
+      beg++;
+  return 0;
+}
+
+struct hol_cluster;            /* fwd decl */
+
+struct hol_entry
+{
+  /* First option.  */
+  const struct argp_option *opt;
+  /* Number of options (including aliases).  */
+  unsigned num;
+
+  /* A pointers into the HOL's short_options field, to the first short option
+     letter for this entry.  The order of the characters following this point
+     corresponds to the order of options pointed to by OPT, and there are at
+     most NUM.  A short option recorded in a option following OPT is only
+     valid if it occurs in the right place in SHORT_OPTIONS (otherwise it's
+     probably been shadowed by some other entry).  */
+  char *short_options;
+
+  /* Entries are sorted by their group first, in the order:
+       1, 2, ..., n, 0, -m, ..., -2, -1
+     and then alphabetically within each group.  The default is 0.  */
+  int group;
+
+  /* The cluster of options this entry belongs to, or 0 if none.  */
+  struct hol_cluster *cluster;
+
+  /* The argp from which this option came.  */
+  const struct argp *argp;
+};
+
+/* A cluster of entries to reflect the argp tree structure.  */
+struct hol_cluster
+{
+  /* A descriptive header printed before options in this cluster.  */
+  const char *header;
+
+  /* Used to order clusters within the same group with the same parent,
+     according to the order in which they occurred in the parent argp's child
+     list.  */
+  int index;
+
+  /* How to sort this cluster with respect to options and other clusters at the
+     same depth (clusters always follow options in the same group).  */
+  int group;
+
+  /* The cluster to which this cluster belongs, or 0 if it's at the base
+     level.  */
+  struct hol_cluster *parent;
+
+  /* The argp from which this cluster is (eventually) derived.  */
+  const struct argp *argp;
+
+  /* The distance this cluster is from the root.  */
+  int depth;
+
+  /* Clusters in a given hol are kept in a linked list, to make freeing them
+     possible.  */
+  struct hol_cluster *next;
+};
+
+/* A list of options for help.  */
+struct hol
+{
+  /* An array of hol_entry's.  */
+  struct hol_entry *entries;
+  /* The number of entries in this hol.  If this field is zero, the others
+     are undefined.  */
+  unsigned num_entries;
+
+  /* A string containing all short options in this HOL.  Each entry contains
+     pointers into this string, so the order can't be messed with blindly.  */
+  char *short_options;
+
+  /* Clusters of entries in this hol.  */
+  struct hol_cluster *clusters;
+};
+
+/* Create a struct hol from the options in ARGP.  CLUSTER is the
+   hol_cluster in which these entries occur, or 0, if at the root.  */
+static struct hol *
+make_hol (const struct argp *argp, struct hol_cluster *cluster)
+{
+  char *so;
+  const struct argp_option *o;
+  const struct argp_option *opts = argp->options;
+  struct hol_entry *entry;
+  unsigned num_short_options = 0;
+  struct hol *hol = malloc (sizeof (struct hol));
+
+  assert (hol);
+
+  hol->num_entries = 0;
+  hol->clusters = 0;
+
+  if (opts)
+    {
+      int cur_group = 0;
+
+      /* The first option must not be an alias.  */
+      assert (! oalias (opts));
+
+      /* Calculate the space needed.  */
+      for (o = opts; ! oend (o); o++)
+       {
+         if (! oalias (o))
+           hol->num_entries++;
+         if (oshort (o))
+           num_short_options++;        /* This is an upper bound.  */
+       }
+
+      hol->entries = malloc (sizeof (struct hol_entry) * hol->num_entries);
+      hol->short_options = malloc (num_short_options + 1);
+
+      assert (hol->entries && hol->short_options);
+#if SIZE_MAX <= UINT_MAX
+      assert (hol->num_entries <= SIZE_MAX / sizeof (struct hol_entry));
+#endif
+
+      /* Fill in the entries.  */
+      so = hol->short_options;
+      for (o = opts, entry = hol->entries; ! oend (o); entry++)
+       {
+         entry->opt = o;
+         entry->num = 0;
+         entry->short_options = so;
+         entry->group = cur_group =
+           o->group
+           ? o->group
+           : ((!o->name && !o->key)
+              ? cur_group + 1
+              : cur_group);
+         entry->cluster = cluster;
+         entry->argp = argp;
+
+         do
+           {
+             entry->num++;
+             if (oshort (o) && ! find_char (o->key, hol->short_options, so))
+               /* O has a valid short option which hasn't already been used.*/
+               *so++ = o->key;
+             o++;
+           }
+         while (! oend (o) && oalias (o));
+       }
+      *so = '\0';              /* null terminated so we can find the length */
+    }
+
+  return hol;
+}
+
+/* Add a new cluster to HOL, with the given GROUP and HEADER (taken from the
+   associated argp child list entry), INDEX, and PARENT, and return a pointer
+   to it.  ARGP is the argp that this cluster results from.  */
+static struct hol_cluster *
+hol_add_cluster (struct hol *hol, int group, const char *header, int index,
+                struct hol_cluster *parent, const struct argp *argp)
+{
+  struct hol_cluster *cl = malloc (sizeof (struct hol_cluster));
+  if (cl)
+    {
+      cl->group = group;
+      cl->header = header;
+
+      cl->index = index;
+      cl->parent = parent;
+      cl->argp = argp;
+      cl->depth = parent ? parent->depth + 1 : 0;
+
+      cl->next = hol->clusters;
+      hol->clusters = cl;
+    }
+  return cl;
+}
+
+/* Free HOL and any resources it uses.  */
+static void
+hol_free (struct hol *hol)
+{
+  struct hol_cluster *cl = hol->clusters;
+
+  while (cl)
+    {
+      struct hol_cluster *next = cl->next;
+      free (cl);
+      cl = next;
+    }
+
+  if (hol->num_entries > 0)
+    {
+      free (hol->entries);
+      free (hol->short_options);
+    }
+
+  free (hol);
+}
+
+static int
+hol_entry_short_iterate (const struct hol_entry *entry,
+                        int (*func)(const struct argp_option *opt,
+                                    const struct argp_option *real,
+                                    const char *domain, void *cookie),
+                        const char *domain, void *cookie)
+{
+  unsigned nopts;
+  int val = 0;
+  const struct argp_option *opt, *real = entry->opt;
+  char *so = entry->short_options;
+
+  for (opt = real, nopts = entry->num; nopts > 0 && !val; opt++, nopts--)
+    if (oshort (opt) && *so == opt->key)
+      {
+       if (!oalias (opt))
+         real = opt;
+       if (ovisible (opt))
+         val = (*func)(opt, real, domain, cookie);
+       so++;
+      }
+
+  return val;
+}
+
+static __inline__ int
+__attribute__ ((always_inline))
+hol_entry_long_iterate (const struct hol_entry *entry,
+                       int (*func)(const struct argp_option *opt,
+                                   const struct argp_option *real,
+                                   const char *domain, void *cookie),
+                       const char *domain, void *cookie)
+{
+  unsigned nopts;
+  int val = 0;
+  const struct argp_option *opt, *real = entry->opt;
+
+  for (opt = real, nopts = entry->num; nopts > 0 && !val; opt++, nopts--)
+    if (opt->name)
+      {
+       if (!oalias (opt))
+         real = opt;
+       if (ovisible (opt))
+         val = (*func)(opt, real, domain, cookie);
+      }
+
+  return val;
+}
+
+/* Iterator that returns true for the first short option.  */
+static __inline__ int
+until_short (const struct argp_option *opt, const struct argp_option *real,
+            const char *domain, void *cookie)
+{
+  return oshort (opt) ? opt->key : 0;
+}
+
+/* Returns the first valid short option in ENTRY, or 0 if there is none.  */
+static char
+hol_entry_first_short (const struct hol_entry *entry)
+{
+  return hol_entry_short_iterate (entry, until_short,
+                                 entry->argp->argp_domain, 0);
+}
+
+/* Returns the first valid long option in ENTRY, or 0 if there is none.  */
+static const char *
+hol_entry_first_long (const struct hol_entry *entry)
+{
+  const struct argp_option *opt;
+  unsigned num;
+  for (opt = entry->opt, num = entry->num; num > 0; opt++, num--)
+    if (opt->name && ovisible (opt))
+      return opt->name;
+  return 0;
+}
+
+/* Returns the entry in HOL with the long option name NAME, or 0 if there is
+   none.  */
+static struct hol_entry *
+hol_find_entry (struct hol *hol, const char *name)
+{
+  struct hol_entry *entry = hol->entries;
+  unsigned num_entries = hol->num_entries;
+
+  while (num_entries-- > 0)
+    {
+      const struct argp_option *opt = entry->opt;
+      unsigned num_opts = entry->num;
+
+      while (num_opts-- > 0)
+       if (opt->name && ovisible (opt) && strcmp (opt->name, name) == 0)
+         return entry;
+       else
+         opt++;
+
+      entry++;
+    }
+
+  return 0;
+}
+
+/* If an entry with the long option NAME occurs in HOL, set it's special
+   sort position to GROUP.  */
+static void
+hol_set_group (struct hol *hol, const char *name, int group)
+{
+  struct hol_entry *entry = hol_find_entry (hol, name);
+  if (entry)
+    entry->group = group;
+}
+
+/* Order by group:  0, 1, 2, ..., n, -m, ..., -2, -1.
+   EQ is what to return if GROUP1 and GROUP2 are the same.  */
+static int
+group_cmp (int group1, int group2, int eq)
+{
+  if (group1 == group2)
+    return eq;
+  else if ((group1 < 0 && group2 < 0) || (group1 >= 0 && group2 >= 0))
+    return group1 - group2;
+  else
+    return group2 - group1;
+}
+
+/* Compare clusters CL1 & CL2 by the order that they should appear in
+   output.  */
+static int
+hol_cluster_cmp (const struct hol_cluster *cl1, const struct hol_cluster *cl2)
+{
+  /* If one cluster is deeper than the other, use its ancestor at the same
+     level, so that finding the common ancestor is straightforward.  */
+  while (cl1->depth > cl2->depth)
+    cl1 = cl1->parent;
+  while (cl2->depth > cl1->depth)
+    cl2 = cl2->parent;
+
+  /* Now reduce both clusters to their ancestors at the point where both have
+     a common parent; these can be directly compared.  */
+  while (cl1->parent != cl2->parent)
+    cl1 = cl1->parent, cl2 = cl2->parent;
+
+  return group_cmp (cl1->group, cl2->group, cl2->index - cl1->index);
+}
+
+/* Return the ancestor of CL that's just below the root (i.e., has a parent
+   of 0).  */
+static struct hol_cluster *
+hol_cluster_base (struct hol_cluster *cl)
+{
+  while (cl->parent)
+    cl = cl->parent;
+  return cl;
+}
+
+/* Return true if CL1 is a child of CL2.  */
+static int
+hol_cluster_is_child (const struct hol_cluster *cl1,
+                     const struct hol_cluster *cl2)
+{
+  while (cl1 && cl1 != cl2)
+    cl1 = cl1->parent;
+  return cl1 == cl2;
+}
+
+/* Given the name of a OPTION_DOC option, modifies NAME to start at the tail
+   that should be used for comparisons, and returns true iff it should be
+   treated as a non-option.  */
+static int
+canon_doc_option (const char **name)
+{
+  int non_opt;
+  /* Skip initial whitespace.  */
+  while (isspace (**name))
+    (*name)++;
+  /* Decide whether this looks like an option (leading `-') or not.  */
+  non_opt = (**name != '-');
+  /* Skip until part of name used for sorting.  */
+  while (**name && !isalnum (**name))
+    (*name)++;
+  return non_opt;
+}
+
+/* Order ENTRY1 & ENTRY2 by the order which they should appear in a help
+   listing.  */
+static int
+hol_entry_cmp (const struct hol_entry *entry1,
+              const struct hol_entry *entry2)
+{
+  /* The group numbers by which the entries should be ordered; if either is
+     in a cluster, then this is just the group within the cluster.  */
+  int group1 = entry1->group, group2 = entry2->group;
+
+  if (entry1->cluster != entry2->cluster)
+    {
+      /* The entries are not within the same cluster, so we can't compare them
+        directly, we have to use the appropiate clustering level too.  */
+      if (! entry1->cluster)
+       /* ENTRY1 is at the `base level', not in a cluster, so we have to
+          compare it's group number with that of the base cluster in which
+          ENTRY2 resides.  Note that if they're in the same group, the
+          clustered option always comes laster.  */
+       return group_cmp (group1, hol_cluster_base (entry2->cluster)->group, -1);
+      else if (! entry2->cluster)
+       /* Likewise, but ENTRY2's not in a cluster.  */
+       return group_cmp (hol_cluster_base (entry1->cluster)->group, group2, 1);
+      else
+       /* Both entries are in clusters, we can just compare the clusters.  */
+       return hol_cluster_cmp (entry1->cluster, entry2->cluster);
+    }
+  else if (group1 == group2)
+    /* The entries are both in the same cluster and group, so compare them
+       alphabetically.  */
+    {
+      int short1 = hol_entry_first_short (entry1);
+      int short2 = hol_entry_first_short (entry2);
+      int doc1 = odoc (entry1->opt);
+      int doc2 = odoc (entry2->opt);
+      const char *long1 = hol_entry_first_long (entry1);
+      const char *long2 = hol_entry_first_long (entry2);
+
+      if (doc1)
+       doc1 = long1 != NULL && canon_doc_option (&long1);
+      if (doc2)
+       doc2 = long2 != NULL && canon_doc_option (&long2);
+
+      if (doc1 != doc2)
+       /* `documentation' options always follow normal options (or
+          documentation options that *look* like normal options).  */
+       return doc1 - doc2;
+      else if (!short1 && !short2 && long1 && long2)
+       /* Only long options.  */
+       return strcasecmp (long1, long2);
+      else
+       /* Compare short/short, long/short, short/long, using the first
+          character of long options.  Entries without *any* valid
+          options (such as options with OPTION_HIDDEN set) will be put
+          first, but as they're not displayed, it doesn't matter where
+          they are.  */
+       {
+         char first1 = short1 ? short1 : long1 ? *long1 : 0;
+         char first2 = short2 ? short2 : long2 ? *long2 : 0;
+#ifdef _tolower
+         int lower_cmp = _tolower (first1) - _tolower (first2);
+#else
+         int lower_cmp = tolower (first1) - tolower (first2);
+#endif
+         /* Compare ignoring case, except when the options are both the
+            same letter, in which case lower-case always comes first.  */
+         return lower_cmp ? lower_cmp : first2 - first1;
+       }
+    }
+  else
+    /* Within the same cluster, but not the same group, so just compare
+       groups.  */
+    return group_cmp (group1, group2, 0);
+}
+
+/* Version of hol_entry_cmp with correct signature for qsort.  */
+static int
+hol_entry_qcmp (const void *entry1_v, const void *entry2_v)
+{
+  return hol_entry_cmp (entry1_v, entry2_v);
+}
+
+/* Sort HOL by group and alphabetically by option name (with short options
+   taking precedence over long).  Since the sorting is for display purposes
+   only, the shadowing of options isn't effected.  */
+static void
+hol_sort (struct hol *hol)
+{
+  if (hol->num_entries > 0)
+    qsort (hol->entries, hol->num_entries, sizeof (struct hol_entry),
+          hol_entry_qcmp);
+}
+
+/* Append MORE to HOL, destroying MORE in the process.  Options in HOL shadow
+   any in MORE with the same name.  */
+static void
+hol_append (struct hol *hol, struct hol *more)
+{
+  struct hol_cluster **cl_end = &hol->clusters;
+
+  /* Steal MORE's cluster list, and add it to the end of HOL's.  */
+  while (*cl_end)
+    cl_end = &(*cl_end)->next;
+  *cl_end = more->clusters;
+  more->clusters = 0;
+
+  /* Merge entries.  */
+  if (more->num_entries > 0)
+    {
+      if (hol->num_entries == 0)
+       {
+         hol->num_entries = more->num_entries;
+         hol->entries = more->entries;
+         hol->short_options = more->short_options;
+         more->num_entries = 0;        /* Mark MORE's fields as invalid.  */
+       }
+      else
+       /* Append the entries in MORE to those in HOL, taking care to only add
+          non-shadowed SHORT_OPTIONS values.  */
+       {
+         unsigned left;
+         char *so, *more_so;
+         struct hol_entry *e;
+         unsigned num_entries = hol->num_entries + more->num_entries;
+         struct hol_entry *entries =
+           malloc (num_entries * sizeof (struct hol_entry));
+         unsigned hol_so_len = strlen (hol->short_options);
+         char *short_options =
+           malloc (hol_so_len + strlen (more->short_options) + 1);
+
+         assert (entries && short_options);
+#if SIZE_MAX <= UINT_MAX
+         assert (num_entries <= SIZE_MAX / sizeof (struct hol_entry));
+#endif
+
+         mempcpy (mempcpy (entries, hol->entries,
+                               hol->num_entries * sizeof (struct hol_entry)),
+                    more->entries,
+                    more->num_entries * sizeof (struct hol_entry));
+
+         mempcpy (short_options, hol->short_options, hol_so_len);
+
+         /* Fix up the short options pointers from HOL.  */
+         for (e = entries, left = hol->num_entries; left > 0; e++, left--)
+           e->short_options += (short_options - hol->short_options);
+
+         /* Now add the short options from MORE, fixing up its entries
+            too.  */
+         so = short_options + hol_so_len;
+         more_so = more->short_options;
+         for (left = more->num_entries; left > 0; e++, left--)
+           {
+             int opts_left;
+             const struct argp_option *opt;
+
+             e->short_options = so;
+
+             for (opts_left = e->num, opt = e->opt; opts_left; opt++, opts_left--)
+               {
+                 int ch = *more_so;
+                 if (oshort (opt) && ch == opt->key)
+                   /* The next short option in MORE_SO, CH, is from OPT.  */
+                   {
+                     if (! find_char (ch, short_options,
+                                      short_options + hol_so_len))
+                       /* The short option CH isn't shadowed by HOL's options,
+                          so add it to the sum.  */
+                       *so++ = ch;
+                     more_so++;
+                   }
+               }
+           }
+
+         *so = '\0';
+
+         free (hol->entries);
+         free (hol->short_options);
+
+         hol->entries = entries;
+         hol->num_entries = num_entries;
+         hol->short_options = short_options;
+       }
+    }
+
+  hol_free (more);
+}
+
+/* Inserts enough spaces to make sure STREAM is at column COL.  */
+static void
+indent_to (argp_fmtstream_t stream, unsigned col)
+{
+  int needed = col - __argp_fmtstream_point (stream);
+  while (needed-- > 0)
+    __argp_fmtstream_putc (stream, ' ');
+}
+
+/* Output to STREAM either a space, or a newline if there isn't room for at
+   least ENSURE characters before the right margin.  */
+static void
+space (argp_fmtstream_t stream, size_t ensure)
+{
+  if (__argp_fmtstream_point (stream) + ensure
+      >= __argp_fmtstream_rmargin (stream))
+    __argp_fmtstream_putc (stream, '\n');
+  else
+    __argp_fmtstream_putc (stream, ' ');
+}
+
+/* If the option REAL has an argument, we print it in using the printf
+   format REQ_FMT or OPT_FMT depending on whether it's a required or
+   optional argument.  */
+static void
+arg (const struct argp_option *real, const char *req_fmt, const char *opt_fmt,
+     const char *domain, argp_fmtstream_t stream)
+{
+  if (real->arg)
+    {
+      if (real->flags & OPTION_ARG_OPTIONAL)
+       __argp_fmtstream_printf (stream, opt_fmt,
+                                dgettext (domain, real->arg));
+      else
+       __argp_fmtstream_printf (stream, req_fmt,
+                                dgettext (domain, real->arg));
+    }
+}
+
+/* Helper functions for hol_entry_help.  */
+
+/* State used during the execution of hol_help.  */
+struct hol_help_state
+{
+  /* PREV_ENTRY should contain the previous entry printed, or 0.  */
+  struct hol_entry *prev_entry;
+
+  /* If an entry is in a different group from the previous one, and SEP_GROUPS
+     is true, then a blank line will be printed before any output. */
+  int sep_groups;
+
+  /* True if a duplicate option argument was suppressed (only ever set if
+     UPARAMS.dup_args is false).  */
+  int suppressed_dup_arg;
+};
+
+/* Some state used while printing a help entry (used to communicate with
+   helper functions).  See the doc for hol_entry_help for more info, as most
+   of the fields are copied from its arguments.  */
+struct pentry_state
+{
+  const struct hol_entry *entry;
+  argp_fmtstream_t stream;
+  struct hol_help_state *hhstate;
+
+  /* True if nothing's been printed so far.  */
+  int first;
+
+  /* If non-zero, the state that was used to print this help.  */
+  const struct argp_state *state;
+};
+
+/* If a user doc filter should be applied to DOC, do so.  */
+static const char *
+filter_doc (const char *doc, int key, const struct argp *argp,
+           const struct argp_state *state)
+{
+  if (argp && argp->help_filter)
+    /* We must apply a user filter to this output.  */
+    {
+      void *input = __argp_input (argp, state);
+      return (*argp->help_filter) (key, doc, input);
+    }
+  else
+    /* No filter.  */
+    return doc;
+}
+
+/* Prints STR as a header line, with the margin lines set appropiately, and
+   notes the fact that groups should be separated with a blank line.  ARGP is
+   the argp that should dictate any user doc filtering to take place.  Note
+   that the previous wrap margin isn't restored, but the left margin is reset
+   to 0.  */
+static void
+print_header (const char *str, const struct argp *argp,
+             struct pentry_state *pest)
+{
+  const char *tstr = dgettext (argp->argp_domain, str);
+  const char *fstr = filter_doc (tstr, ARGP_KEY_HELP_HEADER, argp, pest->state);
+
+  if (fstr)
+    {
+      if (*fstr)
+       {
+         if (pest->hhstate->prev_entry)
+           /* Precede with a blank line.  */
+           __argp_fmtstream_putc (pest->stream, '\n');
+         indent_to (pest->stream, uparams.header_col);
+         __argp_fmtstream_set_lmargin (pest->stream, uparams.header_col);
+         __argp_fmtstream_set_wmargin (pest->stream, uparams.header_col);
+         __argp_fmtstream_puts (pest->stream, fstr);
+         __argp_fmtstream_set_lmargin (pest->stream, 0);
+         __argp_fmtstream_putc (pest->stream, '\n');
+       }
+
+      pest->hhstate->sep_groups = 1; /* Separate subsequent groups. */
+    }
+
+  if (fstr != tstr)
+    free ((char *) fstr);
+}
+
+/* Inserts a comma if this isn't the first item on the line, and then makes
+   sure we're at least to column COL.  If this *is* the first item on a line,
+   prints any pending whitespace/headers that should precede this line. Also
+   clears FIRST.  */
+static void
+comma (unsigned col, struct pentry_state *pest)
+{
+  if (pest->first)
+    {
+      const struct hol_entry *pe = pest->hhstate->prev_entry;
+      const struct hol_cluster *cl = pest->entry->cluster;
+
+      if (pest->hhstate->sep_groups && pe && pest->entry->group != pe->group)
+       __argp_fmtstream_putc (pest->stream, '\n');
+
+      if (cl && cl->header && *cl->header
+         && (!pe
+             || (pe->cluster != cl
+                 && !hol_cluster_is_child (pe->cluster, cl))))
+       /* If we're changing clusters, then this must be the start of the
+          ENTRY's cluster unless that is an ancestor of the previous one
+          (in which case we had just popped into a sub-cluster for a bit).
+          If so, then print the cluster's header line.  */
+       {
+         int old_wm = __argp_fmtstream_wmargin (pest->stream);
+         print_header (cl->header, cl->argp, pest);
+         __argp_fmtstream_set_wmargin (pest->stream, old_wm);
+       }
+
+      pest->first = 0;
+    }
+  else
+    __argp_fmtstream_puts (pest->stream, ", ");
+
+  indent_to (pest->stream, col);
+}
+
+/* Print help for ENTRY to STREAM.  */
+static void
+hol_entry_help (struct hol_entry *entry, const struct argp_state *state,
+               argp_fmtstream_t stream, struct hol_help_state *hhstate)
+{
+  unsigned num;
+  const struct argp_option *real = entry->opt, *opt;
+  char *so = entry->short_options;
+  int have_long_opt = 0;       /* We have any long options.  */
+  /* Saved margins.  */
+  int old_lm = __argp_fmtstream_set_lmargin (stream, 0);
+  int old_wm = __argp_fmtstream_wmargin (stream);
+  /* PEST is a state block holding some of our variables that we'd like to
+     share with helper functions.  */
+  struct pentry_state pest = { entry, stream, hhstate, 1, state };
+
+  if (! odoc (real))
+    for (opt = real, num = entry->num; num > 0; opt++, num--)
+      if (opt->name && ovisible (opt))
+       {
+         have_long_opt = 1;
+         break;
+       }
+
+  /* First emit short options.  */
+  __argp_fmtstream_set_wmargin (stream, uparams.short_opt_col); /* For truly bizarre cases. */
+  for (opt = real, num = entry->num; num > 0; opt++, num--)
+    if (oshort (opt) && opt->key == *so)
+      /* OPT has a valid (non shadowed) short option.  */
+      {
+       if (ovisible (opt))
+         {
+           comma (uparams.short_opt_col, &pest);
+           __argp_fmtstream_putc (stream, '-');
+           __argp_fmtstream_putc (stream, *so);
+           if (!have_long_opt || uparams.dup_args)
+             arg (real, " %s", "[%s]",
+                  state == NULL ? NULL : state->root_argp->argp_domain,
+                  stream);
+           else if (real->arg)
+             hhstate->suppressed_dup_arg = 1;
+         }
+       so++;
+      }
+
+  /* Now, long options.  */
+  if (odoc (real))
+    /* A `documentation' option.  */
+    {
+      __argp_fmtstream_set_wmargin (stream, uparams.doc_opt_col);
+      for (opt = real, num = entry->num; num > 0; opt++, num--)
+       if (opt->name && ovisible (opt))
+         {
+           comma (uparams.doc_opt_col, &pest);
+           /* Calling gettext here isn't quite right, since sorting will
+              have been done on the original; but documentation options
+              should be pretty rare anyway...  */
+           __argp_fmtstream_puts (stream,
+                                  dgettext (state == NULL ? NULL
+                                            : state->root_argp->argp_domain,
+                                            opt->name));
+         }
+    }
+  else
+    /* A real long option.  */
+    {
+      __argp_fmtstream_set_wmargin (stream, uparams.long_opt_col);
+      for (opt = real, num = entry->num; num > 0; opt++, num--)
+       if (opt->name && ovisible (opt))
+         {
+           comma (uparams.long_opt_col, &pest);
+           __argp_fmtstream_printf (stream, "--%s", opt->name);
+           arg (real, "=%s", "[=%s]",
+                state == NULL ? NULL : state->root_argp->argp_domain, stream);
+         }
+    }
+
+  /* Next, documentation strings.  */
+  __argp_fmtstream_set_lmargin (stream, 0);
+
+  if (pest.first)
+    {
+      /* Didn't print any switches, what's up?  */
+      if (!oshort (real) && !real->name)
+       /* This is a group header, print it nicely.  */
+       print_header (real->doc, entry->argp, &pest);
+      else
+       /* Just a totally shadowed option or null header; print nothing.  */
+       goto cleanup;           /* Just return, after cleaning up.  */
+    }
+  else
+    {
+      const char *tstr = real->doc ? dgettext (state == NULL ? NULL
+                                              : state->root_argp->argp_domain,
+                                              real->doc) : 0;
+      const char *fstr = filter_doc (tstr, real->key, entry->argp, state);
+      if (fstr && *fstr)
+       {
+         unsigned int col = __argp_fmtstream_point (stream);
+
+         __argp_fmtstream_set_lmargin (stream, uparams.opt_doc_col);
+         __argp_fmtstream_set_wmargin (stream, uparams.opt_doc_col);
+
+         if (col > (unsigned int) (uparams.opt_doc_col + 3))
+           __argp_fmtstream_putc (stream, '\n');
+         else if (col >= (unsigned int) uparams.opt_doc_col)
+           __argp_fmtstream_puts (stream, "   ");
+         else
+           indent_to (stream, uparams.opt_doc_col);
+
+         __argp_fmtstream_puts (stream, fstr);
+       }
+      if (fstr && fstr != tstr)
+       free ((char *) fstr);
+
+      /* Reset the left margin.  */
+      __argp_fmtstream_set_lmargin (stream, 0);
+      __argp_fmtstream_putc (stream, '\n');
+    }
+
+  hhstate->prev_entry = entry;
+
+cleanup:
+  __argp_fmtstream_set_lmargin (stream, old_lm);
+  __argp_fmtstream_set_wmargin (stream, old_wm);
+}
+
+/* Output a long help message about the options in HOL to STREAM.  */
+static void
+hol_help (struct hol *hol, const struct argp_state *state,
+         argp_fmtstream_t stream)
+{
+  unsigned num;
+  struct hol_entry *entry;
+  struct hol_help_state hhstate = { 0, 0, 0 };
+
+  for (entry = hol->entries, num = hol->num_entries; num > 0; entry++, num--)
+    hol_entry_help (entry, state, stream, &hhstate);
+
+  if (hhstate.suppressed_dup_arg && uparams.dup_args_note)
+    {
+      const char *tstr = dgettext (state == NULL ? NULL
+                                  : state->root_argp->argp_domain, "\
+Mandatory or optional arguments to long options are also mandatory or \
+optional for any corresponding short options.");
+      const char *fstr = filter_doc (tstr, ARGP_KEY_HELP_DUP_ARGS_NOTE,
+                                    state ? state->root_argp : 0, state);
+      if (fstr && *fstr)
+       {
+         __argp_fmtstream_putc (stream, '\n');
+         __argp_fmtstream_puts (stream, fstr);
+         __argp_fmtstream_putc (stream, '\n');
+       }
+      if (fstr && fstr != tstr)
+       free ((char *) fstr);
+    }
+}
+
+/* Helper functions for hol_usage.  */
+
+/* If OPT is a short option without an arg, append its key to the string
+   pointer pointer to by COOKIE, and advance the pointer.  */
+static int
+add_argless_short_opt (const struct argp_option *opt,
+                      const struct argp_option *real,
+                      const char *domain, void *cookie)
+{
+  char **snao_end = cookie;
+  if (!(opt->arg || real->arg)
+      && !((opt->flags | real->flags) & OPTION_NO_USAGE))
+    *(*snao_end)++ = opt->key;
+  return 0;
+}
+
+/* If OPT is a short option with an arg, output a usage entry for it to the
+   stream pointed at by COOKIE.  */
+static int
+usage_argful_short_opt (const struct argp_option *opt,
+                       const struct argp_option *real,
+                       const char *domain, void *cookie)
+{
+  argp_fmtstream_t stream = cookie;
+  const char *arg = opt->arg;
+  int flags = opt->flags | real->flags;
+
+  if (! arg)
+    arg = real->arg;
+
+  if (arg && !(flags & OPTION_NO_USAGE))
+    {
+      arg = dgettext (domain, arg);
+
+      if (flags & OPTION_ARG_OPTIONAL)
+       __argp_fmtstream_printf (stream, " [-%c[%s]]", opt->key, arg);
+      else
+       {
+         /* Manually do line wrapping so that it (probably) won't
+            get wrapped at the embedded space.  */
+         space (stream, 6 + strlen (arg));
+         __argp_fmtstream_printf (stream, "[-%c %s]", opt->key, arg);
+       }
+    }
+
+  return 0;
+}
+
+/* Output a usage entry for the long option opt to the stream pointed at by
+   COOKIE.  */
+static int
+usage_long_opt (const struct argp_option *opt,
+               const struct argp_option *real,
+               const char *domain, void *cookie)
+{
+  argp_fmtstream_t stream = cookie;
+  const char *arg = opt->arg;
+  int flags = opt->flags | real->flags;
+
+  if (! arg)
+    arg = real->arg;
+
+  if (! (flags & OPTION_NO_USAGE))
+    {
+      if (arg)
+       {
+         arg = dgettext (domain, arg);
+         if (flags & OPTION_ARG_OPTIONAL)
+           __argp_fmtstream_printf (stream, " [--%s[=%s]]", opt->name, arg);
+         else
+           __argp_fmtstream_printf (stream, " [--%s=%s]", opt->name, arg);
+       }
+      else
+       __argp_fmtstream_printf (stream, " [--%s]", opt->name);
+    }
+
+  return 0;
+}
+
+/* Print a short usage description for the arguments in HOL to STREAM.  */
+static void
+hol_usage (struct hol *hol, argp_fmtstream_t stream)
+{
+  if (hol->num_entries > 0)
+    {
+      unsigned nentries;
+      struct hol_entry *entry;
+      char *short_no_arg_opts = alloca (strlen (hol->short_options) + 1);
+      char *snao_end = short_no_arg_opts;
+
+      /* First we put a list of short options without arguments.  */
+      for (entry = hol->entries, nentries = hol->num_entries
+          ; nentries > 0
+          ; entry++, nentries--)
+       hol_entry_short_iterate (entry, add_argless_short_opt,
+                                entry->argp->argp_domain, &snao_end);
+      if (snao_end > short_no_arg_opts)
+       {
+         *snao_end++ = 0;
+         __argp_fmtstream_printf (stream, " [-%s]", short_no_arg_opts);
+       }
+
+      /* Now a list of short options *with* arguments.  */
+      for (entry = hol->entries, nentries = hol->num_entries
+          ; nentries > 0
+          ; entry++, nentries--)
+       hol_entry_short_iterate (entry, usage_argful_short_opt,
+                                entry->argp->argp_domain, stream);
+
+      /* Finally, a list of long options (whew!).  */
+      for (entry = hol->entries, nentries = hol->num_entries
+          ; nentries > 0
+          ; entry++, nentries--)
+       hol_entry_long_iterate (entry, usage_long_opt,
+                               entry->argp->argp_domain, stream);
+    }
+}
+
+/* Make a HOL containing all levels of options in ARGP.  CLUSTER is the
+   cluster in which ARGP's entries should be clustered, or 0.  */
+static struct hol *
+argp_hol (const struct argp *argp, struct hol_cluster *cluster)
+{
+  const struct argp_child *child = argp->children;
+  struct hol *hol = make_hol (argp, cluster);
+  if (child)
+    while (child->argp)
+      {
+       struct hol_cluster *child_cluster =
+         ((child->group || child->header)
+          /* Put CHILD->argp within its own cluster.  */
+          ? hol_add_cluster (hol, child->group, child->header,
+                             child - argp->children, cluster, argp)
+          /* Just merge it into the parent's cluster.  */
+          : cluster);
+       hol_append (hol, argp_hol (child->argp, child_cluster)) ;
+       child++;
+      }
+  return hol;
+}
+
+/* Calculate how many different levels with alternative args strings exist in
+   ARGP.  */
+static size_t
+argp_args_levels (const struct argp *argp)
+{
+  size_t levels = 0;
+  const struct argp_child *child = argp->children;
+
+  if (argp->args_doc && strchr (argp->args_doc, '\n'))
+    levels++;
+
+  if (child)
+    while (child->argp)
+      levels += argp_args_levels ((child++)->argp);
+
+  return levels;
+}
+
+/* Print all the non-option args documented in ARGP to STREAM.  Any output is
+   preceded by a space.  LEVELS is a pointer to a byte vector the length
+   returned by argp_args_levels; it should be initialized to zero, and
+   updated by this routine for the next call if ADVANCE is true.  True is
+   returned as long as there are more patterns to output.  */
+static int
+argp_args_usage (const struct argp *argp, const struct argp_state *state,
+                char **levels, int advance, argp_fmtstream_t stream)
+{
+  char *our_level = *levels;
+  int multiple = 0;
+  const struct argp_child *child = argp->children;
+  const char *tdoc = dgettext (argp->argp_domain, argp->args_doc), *nl = 0;
+  const char *fdoc = filter_doc (tdoc, ARGP_KEY_HELP_ARGS_DOC, argp, state);
+
+  if (fdoc)
+    {
+      const char *cp = fdoc;
+      nl = strchrnul (cp, '\n');
+      if (*nl != '\0')
+       /* This is a `multi-level' args doc; advance to the correct position
+          as determined by our state in LEVELS, and update LEVELS.  */
+       {
+         int i;
+         multiple = 1;
+         for (i = 0; i < *our_level; i++)
+           cp = nl + 1, nl = strchrnul (cp, '\n');
+         (*levels)++;
+       }
+
+      /* Manually do line wrapping so that it (probably) won't get wrapped at
+        any embedded spaces.  */
+      space (stream, 1 + nl - cp);
+
+      __argp_fmtstream_write (stream, cp, nl - cp);
+    }
+  if (fdoc && fdoc != tdoc)
+    free ((char *)fdoc);       /* Free user's modified doc string.  */
+
+  if (child)
+    while (child->argp)
+      advance = !argp_args_usage ((child++)->argp, state, levels, advance, stream);
+
+  if (advance && multiple)
+    {
+      /* Need to increment our level.  */
+      if (*nl)
+       /* There's more we can do here.  */
+       {
+         (*our_level)++;
+         advance = 0;          /* Our parent shouldn't advance also. */
+       }
+      else if (*our_level > 0)
+       /* We had multiple levels, but used them up; reset to zero.  */
+       *our_level = 0;
+    }
+
+  return !advance;
+}
+
+/* Print the documentation for ARGP to STREAM; if POST is false, then
+   everything preceeding a `\v' character in the documentation strings (or
+   the whole string, for those with none) is printed, otherwise, everything
+   following the `\v' character (nothing for strings without).  Each separate
+   bit of documentation is separated a blank line, and if PRE_BLANK is true,
+   then the first is as well.  If FIRST_ONLY is true, only the first
+   occurrence is output.  Returns true if anything was output.  */
+static int
+argp_doc (const struct argp *argp, const struct argp_state *state,
+         int post, int pre_blank, int first_only,
+         argp_fmtstream_t stream)
+{
+  const char *text;
+  const char *inp_text;
+  void *input = 0;
+  int anything = 0;
+  size_t inp_text_limit = 0;
+  const char *doc = dgettext (argp->argp_domain, argp->doc);
+  const struct argp_child *child = argp->children;
+
+  if (doc)
+    {
+      char *vt = strchr (doc, '\v');
+      inp_text = post ? (vt ? vt + 1 : 0) : doc;
+      inp_text_limit = (!post && vt) ? (vt - doc) : 0;
+    }
+  else
+    inp_text = 0;
+
+  if (argp->help_filter)
+    /* We have to filter the doc strings.  */
+    {
+      if (inp_text_limit)
+       /* Copy INP_TEXT so that it's nul-terminated.  */
+       inp_text = strndup (inp_text, inp_text_limit);
+      input = __argp_input (argp, state);
+      text =
+       (*argp->help_filter) (post
+                             ? ARGP_KEY_HELP_POST_DOC
+                             : ARGP_KEY_HELP_PRE_DOC,
+                             inp_text, input);
+    }
+  else
+    text = (const char *) inp_text;
+
+  if (text)
+    {
+      if (pre_blank)
+       __argp_fmtstream_putc (stream, '\n');
+
+      if (text == inp_text && inp_text_limit)
+       __argp_fmtstream_write (stream, inp_text, inp_text_limit);
+      else
+       __argp_fmtstream_puts (stream, text);
+
+      if (__argp_fmtstream_point (stream) > __argp_fmtstream_lmargin (stream))
+       __argp_fmtstream_putc (stream, '\n');
+
+      anything = 1;
+    }
+
+  if (text && text != inp_text)
+    free ((char *) text);      /* Free TEXT returned from the help filter.  */
+  if (inp_text && inp_text_limit && argp->help_filter)
+    free ((char *) inp_text);  /* We copied INP_TEXT, so free it now.  */
+
+  if (post && argp->help_filter)
+    /* Now see if we have to output a ARGP_KEY_HELP_EXTRA text.  */
+    {
+      text = (*argp->help_filter) (ARGP_KEY_HELP_EXTRA, 0, input);
+      if (text)
+       {
+         if (anything || pre_blank)
+           __argp_fmtstream_putc (stream, '\n');
+         __argp_fmtstream_puts (stream, text);
+         free ((char *) text);
+         if (__argp_fmtstream_point (stream)
+             > __argp_fmtstream_lmargin (stream))
+           __argp_fmtstream_putc (stream, '\n');
+         anything = 1;
+       }
+    }
+
+  if (child)
+    while (child->argp && !(first_only && anything))
+      anything |=
+       argp_doc ((child++)->argp, state,
+                 post, anything || pre_blank, first_only,
+                 stream);
+
+  return anything;
+}
+
+/* Output a usage message for ARGP to STREAM.  If called from
+   argp_state_help, STATE is the relevent parsing state.  FLAGS are from the
+   set ARGP_HELP_*.  NAME is what to use wherever a `program name' is
+   needed. */
+static void
+_help (const struct argp *argp, const struct argp_state *state, FILE *stream,
+       unsigned flags, char *name)
+{
+  int anything = 0;            /* Whether we've output anything.  */
+  struct hol *hol = 0;
+  argp_fmtstream_t fs;
+
+  if (! stream)
+    return;
+
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+  flockfile (stream);
+#endif
+
+  fill_in_uparams (state);
+
+  fs = __argp_make_fmtstream (stream, 0, uparams.rmargin, 0);
+  if (! fs)
+    {
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+      funlockfile (stream);
+#endif
+      return;
+    }
+
+  if (flags & (ARGP_HELP_USAGE | ARGP_HELP_SHORT_USAGE | ARGP_HELP_LONG))
+    {
+      hol = argp_hol (argp, 0);
+
+      /* If present, these options always come last.  */
+      hol_set_group (hol, "help", -1);
+      hol_set_group (hol, "version", -1);
+
+      hol_sort (hol);
+    }
+
+  if (flags & (ARGP_HELP_USAGE | ARGP_HELP_SHORT_USAGE))
+    /* Print a short `Usage:' message.  */
+    {
+      int first_pattern = 1, more_patterns;
+      size_t num_pattern_levels = argp_args_levels (argp);
+      char *pattern_levels = alloca (num_pattern_levels);
+
+      memset (pattern_levels, 0, num_pattern_levels);
+
+      do
+       {
+         int old_lm;
+         int old_wm = __argp_fmtstream_set_wmargin (fs, uparams.usage_indent);
+         char *levels = pattern_levels;
+
+         if (first_pattern)
+           __argp_fmtstream_printf (fs, "%s %s",
+                                    dgettext (argp->argp_domain, "Usage:"),
+                                    name);
+         else
+           __argp_fmtstream_printf (fs, "%s %s",
+                                    dgettext (argp->argp_domain, "  or: "),
+                                    name);
+
+         /* We set the lmargin as well as the wmargin, because hol_usage
+            manually wraps options with newline to avoid annoying breaks.  */
+         old_lm = __argp_fmtstream_set_lmargin (fs, uparams.usage_indent);
+
+         if (flags & ARGP_HELP_SHORT_USAGE)
+           /* Just show where the options go.  */
+           {
+             if (hol->num_entries > 0)
+               __argp_fmtstream_puts (fs, dgettext (argp->argp_domain,
+                                                    " [OPTION...]"));
+           }
+         else
+           /* Actually print the options.  */
+           {
+             hol_usage (hol, fs);
+             flags |= ARGP_HELP_SHORT_USAGE; /* But only do so once.  */
+           }
+
+         more_patterns = argp_args_usage (argp, state, &levels, 1, fs);
+
+         __argp_fmtstream_set_wmargin (fs, old_wm);
+         __argp_fmtstream_set_lmargin (fs, old_lm);
+
+         __argp_fmtstream_putc (fs, '\n');
+         anything = 1;
+
+         first_pattern = 0;
+       }
+      while (more_patterns);
+    }
+
+  if (flags & ARGP_HELP_PRE_DOC)
+    anything |= argp_doc (argp, state, 0, 0, 1, fs);
+
+  if (flags & ARGP_HELP_SEE)
+    {
+      __argp_fmtstream_printf (fs, dgettext (argp->argp_domain, "\
+Try `%s --help' or `%s --usage' for more information.\n"),
+                              name, name);
+      anything = 1;
+    }
+
+  if (flags & ARGP_HELP_LONG)
+    /* Print a long, detailed help message.  */
+    {
+      /* Print info about all the options.  */
+      if (hol->num_entries > 0)
+       {
+         if (anything)
+           __argp_fmtstream_putc (fs, '\n');
+         hol_help (hol, state, fs);
+         anything = 1;
+       }
+    }
+
+  if (flags & ARGP_HELP_POST_DOC)
+    /* Print any documentation strings at the end.  */
+    anything |= argp_doc (argp, state, 1, anything, 0, fs);
+
+  if ((flags & ARGP_HELP_BUG_ADDR) && argp_program_bug_address)
+    {
+      if (anything)
+       __argp_fmtstream_putc (fs, '\n');
+      __argp_fmtstream_printf (fs, dgettext (argp->argp_domain,
+                                            "Report bugs to %s.\n"),
+                              argp_program_bug_address);
+      anything = 1;
+    }
+
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+  funlockfile (stream);
+#endif
+
+  if (hol)
+    hol_free (hol);
+
+  __argp_fmtstream_free (fs);
+}
+
+/* Output a usage message for ARGP to STREAM.  FLAGS are from the set
+   ARGP_HELP_*.  NAME is what to use wherever a `program name' is needed. */
+void argp_help (const struct argp *argp, FILE *stream,
+                 unsigned flags, char *name)
+{
+  _help (argp, 0, stream, flags, name);
+}
+
+char *
+__argp_short_program_name (void)
+{
+# ifdef __UCLIBC_HAS_PROGRAM_INVOCATION_NAME__
+/*
+ * uClibc provides both program_invocation_name and
+ * program_invocation_short_name
+ */
+ return (char *) program_invocation_short_name;
+# else
+  /* FIXME: What now? Miles suggests that it is better to use NULL,
+     but currently the value is passed on directly to fputs_unlocked,
+     so that requires more changes. */
+# if __GNUC__
+#  warning No reasonable value to return
+# endif /* __GNUC__ */
+  return "";
+# endif
+}
+
+/* Output, if appropriate, a usage message for STATE to STREAM.  FLAGS are
+   from the set ARGP_HELP_*.  */
+void
+argp_state_help (const struct argp_state *state, FILE *stream, unsigned flags)
+{
+  if ((!state || ! (state->flags & ARGP_NO_ERRS)) && stream)
+    {
+      if (state && (state->flags & ARGP_LONG_ONLY))
+       flags |= ARGP_HELP_LONG_ONLY;
+
+      _help (state ? state->root_argp : 0, state, stream, flags,
+            state ? state->name : __argp_short_program_name ());
+
+      if (!state || ! (state->flags & ARGP_NO_EXIT))
+       {
+         if (flags & ARGP_HELP_EXIT_ERR)
+           exit (argp_err_exit_status);
+         if (flags & ARGP_HELP_EXIT_OK)
+           exit (0);
+       }
+  }
+}
+
+/* If appropriate, print the printf string FMT and following args, preceded
+   by the program name and `:', to stderr, and followed by a `Try ... --help'
+   message, then exit (1).  */
+void
+argp_error (const struct argp_state *state, const char *fmt, ...)
+{
+  if (!state || !(state->flags & ARGP_NO_ERRS))
+    {
+      FILE *stream = state ? state->err_stream : stderr;
+
+      if (stream)
+       {
+         va_list ap;
+
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+         flockfile (stream);
+#endif
+
+         va_start (ap, fmt);
+
+#if defined _LIBC && defined USE_IN_LIBIO
+         char *buf;
+
+         if (_IO_vasprintf (&buf, fmt, ap) < 0)
+           buf = NULL;
+
+         __fxprintf (stream, "%s: %s\n",
+                     state ? state->name : __argp_short_program_name (), buf);
+
+         free (buf);
+#else
+         fputs_unlocked (state ? state->name : __argp_short_program_name (),
+                         stream);
+         putc_unlocked (':', stream);
+         putc_unlocked (' ', stream);
+
+         vfprintf (stream, fmt, ap);
+
+         putc_unlocked ('\n', stream);
+#endif
+
+         argp_state_help (state, stream, ARGP_HELP_STD_ERR);
+
+         va_end (ap);
+
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+         funlockfile (stream);
+#endif
+       }
+    }
+}
+
+/* Similar to the standard gnu error-reporting function error(), but will
+   respect the ARGP_NO_EXIT and ARGP_NO_ERRS flags in STATE, and will print
+   to STATE->err_stream.  This is useful for argument parsing code that is
+   shared between program startup (when exiting is desired) and runtime
+   option parsing (when typically an error code is returned instead).  The
+   difference between this function and argp_error is that the latter is for
+   *parsing errors*, and the former is for other problems that occur during
+   parsing but don't reflect a (syntactic) problem with the input.  */
+void
+argp_failure (const struct argp_state *state, int status, int errnum,
+               const char *fmt, ...)
+{
+  if (!state || !(state->flags & ARGP_NO_ERRS))
+    {
+      FILE *stream = state ? state->err_stream : stderr;
+
+      if (stream)
+       {
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+         flockfile (stream);
+#endif
+
+#if defined _LIBC && defined USE_IN_LIBIO
+         __fxprintf (stream, "%s",
+                     state ? state->name : __argp_short_program_name ());
+#else
+         fputs_unlocked (state ? state->name : __argp_short_program_name (),
+                         stream);
+#endif
+
+         if (fmt)
+           {
+             va_list ap;
+
+             va_start (ap, fmt);
+#if defined _LIBC && defined USE_IN_LIBIO
+             char *buf;
+
+             if (_IO_vasprintf (&buf, fmt, ap) < 0)
+               buf = NULL;
+
+             __fxprintf (stream, ": %s", buf);
+
+             free (buf);
+#else
+             putc_unlocked (':', stream);
+             putc_unlocked (' ', stream);
+
+             vfprintf (stream, fmt, ap);
+#endif
+
+             va_end (ap);
+           }
+
+         if (errnum)
+           {
+#if (defined _LIBC && defined USE_IN_LIBIO) || defined HAVE_STRERROR_R
+             char buf[200];
+#endif
+#if defined _LIBC && defined USE_IN_LIBIO
+             __fxprintf (stream, ": %s",
+                         strerror_r (errnum, buf, sizeof (buf)));
+#else
+             putc_unlocked (':', stream);
+             putc_unlocked (' ', stream);
+# ifdef HAVE_STRERROR_R
+             fputs (strerror_r (errnum, buf, sizeof (buf)), stream);
+# else
+             fputs (strerror (errnum), stream);
+# endif
+#endif
+           }
+
+#ifdef USE_IN_LIBIO
+         if (_IO_fwide (stream, 0) > 0)
+           putwc_unlocked (L'\n', stream);
+         else
+#endif
+           putc_unlocked ('\n', stream);
+
+#if _LIBC || (HAVE_FLOCKFILE && HAVE_FUNLOCKFILE)
+         funlockfile (stream);
+#endif
+
+         if (status && (!state || !(state->flags & ARGP_NO_EXIT)))
+           exit (status);
+       }
+    }
+}