Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1646 insertions, 0 deletions

diff --git a/doc/yat2m.c b/doc/yat2m.c
new file mode 100644
index 0000000..c7bec33
--- /dev/null
+++ b/doc/yat2m.c
@@ -0,0 +1,1646 @@
+/* yat2m.c - Yet Another Texi 2 Man converter
+ *	Copyright (C) 2005, 2013, 2015, 2016, 2017 g10 Code GmbH
+ *      Copyright (C) 2006, 2008, 2011 Free Software Foundation, Inc.
+ *
+ * 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
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**********************************************
+ * Note: The canonical source of this tool   **
+ *       is part of libgpg-error and it      **
+ *       installs yat2m on the build system. **
+ **********************************************/
+
+/*
+    This is a simple texinfo to man page converter.  It needs some
+    special markup in th e texinfo and tries best to get a create man
+    page.  It has been designed for the GnuPG man pages and thus only
+    a few texinfo commands are supported.
+
+    To use this you need to add the following macros into your texinfo
+    source:
+
+      @macro manpage {a}
+      @end macro
+      @macro mansect {a}
+      @end macro
+      @macro manpause
+      @end macro
+      @macro mancont
+      @end macro
+
+    They are used by yat2m to select parts of the Texinfo which should
+    go into the man page. These macros need to be used without leading
+    left space. Processing starts after a "manpage" macro has been
+    seen.  "mansect" identifies the section and yat2m make sure to
+    emit the sections in the proper order.  Note that @mansect skips
+    the next input line if that line begins with @section, @subsection or
+    @chapheading.
+
+    To insert verbatim troff markup, the following texinfo code may be
+    used:
+
+      @ifset manverb
+      .B whateever you want
+      @end ifset
+
+    alternativly a special comment may be used:
+
+      @c man:.B whatever you want
+
+    This is useful in case you need just one line. If you want to
+    include parts only in the man page but keep the texinfo
+    translation you may use:
+
+      @ifset isman
+      stuff to be rendered only on man pages
+      @end ifset
+
+    or to exclude stuff from man pages:
+
+      @ifclear isman
+      stuff not to be rendered on man pages
+      @end ifclear
+
+    the keyword @section is ignored, however @subsection gets rendered
+    as ".SS".  @menu is completely skipped. Several man pages may be
+    extracted from one file, either using the --store or the --select
+    option.
+
+    If you want to indent tables in the source use this style:
+
+      @table foo
+        @item
+        @item
+        @table
+          @item
+        @end
+      @end
+
+    Don't change the indentation within a table and keep the same
+    number of white space at the start of the line.  yat2m simply
+    detects the number of white spaces in front of an @item and remove
+    this number of spaces from all following lines until a new @item
+    is found or there are less spaces than for the last @item.
+
+    Note that @* does only work correctly if used at the end of an
+    input line.
+
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <ctype.h>
+#include <time.h>
+
+
+#if __GNUC__
+# define MY_GCC_VERSION (__GNUC__ * 10000 \
+                         + __GNUC_MINOR__ * 100         \
+                         + __GNUC_PATCHLEVEL__)
+#else
+# define MY_GCC_VERSION 0
+#endif
+
+#if MY_GCC_VERSION >= 20500
+# define ATTR_PRINTF(f, a) __attribute__ ((format(printf,f,a)))
+# define ATTR_NR_PRINTF(f, a) __attribute__ ((noreturn, format(printf,f,a)))
+#else
+# define ATTR_PRINTF(f, a)
+# define ATTR_NR_PRINTF(f, a)
+#endif
+#if MY_GCC_VERSION >= 30200
+# define ATTR_MALLOC  __attribute__ ((__malloc__))
+#else
+# define ATTR_MALLOC
+#endif
+
+
+
+#define PGM "yat2m"
+#define VERSION "1.0"
+
+/* The maximum length of a line including the linefeed and one extra
+   character. */
+#define LINESIZE 1024
+
+/* Number of allowed condition nestings.  */
+#define MAX_CONDITION_NESTING  10
+
+/* Option flags. */
+static int verbose;
+static int quiet;
+static int debug;
+static const char *opt_source;
+static const char *opt_release;
+static const char *opt_date;
+static const char *opt_select;
+static const char *opt_include;
+static int opt_store;
+
+/* Flag to keep track whether any error occurred.  */
+static int any_error;
+
+
+/* Object to keep macro definitions.  */
+struct macro_s
+{
+  struct macro_s *next;
+  char *value;    /* Malloced value. */
+  char name[1];
+};
+typedef struct macro_s *macro_t;
+
+/* List of all defined macros. */
+static macro_t macrolist;
+
+/* List of variables set by @set. */
+static macro_t variablelist;
+
+/* List of global macro names.  The value part is not used.  */
+static macro_t predefinedmacrolist;
+
+/* Object to keep track of @isset and @ifclear.  */
+struct condition_s
+{
+  int manverb;   /* "manverb" needs special treatment.  */
+  int isset;     /* This is an @isset condition.  */
+  char name[1];  /* Name of the condition macro.  */
+};
+typedef struct condition_s *condition_t;
+
+/* The stack used to evaluate conditions.  And the current states. */
+static condition_t condition_stack[MAX_CONDITION_NESTING];
+static int condition_stack_idx;
+static int cond_is_active;     /* State of ifset/ifclear */
+static int cond_in_verbatim;   /* State of "manverb".  */
+
+
+/* Object to store one line of content.  */
+struct line_buffer_s
+{
+  struct line_buffer_s *next;
+  int verbatim;  /* True if LINE contains verbatim data.  The default
+                    is Texinfo source.  */
+  char *line;
+};
+typedef struct line_buffer_s *line_buffer_t;
+
+
+/* Object to collect the data of a section.  */
+struct section_buffer_s
+{
+  char *name;           /* Malloced name of the section. This may be
+                           NULL to indicate this slot is not used.  */
+  line_buffer_t lines;  /* Linked list with the lines of the section.  */
+  line_buffer_t *lines_tail; /* Helper for faster appending to the
+                                linked list.  */
+  line_buffer_t last_line;   /* Points to the last line appended.  */
+};
+typedef struct section_buffer_s *section_buffer_t;
+
+/* Variable to keep info about the current page together.  */
+static struct
+{
+  /* Filename of the current page or NULL if no page is active.  Malloced. */
+  char *name;
+
+  /* Number of allocated elements in SECTIONS below.  */
+  size_t n_sections;
+  /* Array with the data of the sections.  */
+  section_buffer_t sections;
+
+} thepage;
+
+
+/* The list of standard section names.  COMMANDS and ASSUAN are GnuPG
+   specific. */
+static const char * const standard_sections[] =
+  { "NAME",  "SYNOPSIS",  "DESCRIPTION",
+    "RETURN VALUE", "EXIT STATUS", "ERROR HANDLING", "ERRORS",
+    "COMMANDS", "OPTIONS", "USAGE", "EXAMPLES", "FILES",
+    "ENVIRONMENT", "DIAGNOSTICS", "SECURITY", "CONFORMING TO",
+    "ASSUAN", "NOTES", "BUGS", "AUTHOR", "SEE ALSO", NULL };
+
+
+/*-- Local prototypes.  --*/
+static void proc_texi_buffer (FILE *fp, const char *line, size_t len,
+                              int *table_level, int *eol_action);
+
+static void die (const char *format, ...) ATTR_NR_PRINTF(1,2);
+static void err (const char *format, ...) ATTR_PRINTF(1,2);
+static void inf (const char *format, ...) ATTR_PRINTF(1,2);
+static void *xmalloc (size_t n) ATTR_MALLOC;
+static void *xcalloc (size_t n, size_t m) ATTR_MALLOC;
+
+
+
+/*-- Functions --*/
+
+/* Print diagnostic message and exit with failure. */
+static void
+die (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  fflush (stdout);
+  fprintf (stderr, "%s: ", PGM);
+
+  va_start (arg_ptr, format);
+  vfprintf (stderr, format, arg_ptr);
+  va_end (arg_ptr);
+  putc ('\n', stderr);
+
+  exit (1);
+}
+
+
+/* Print diagnostic message. */
+static void
+err (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  fflush (stdout);
+  if (strncmp (format, "%s:%d:", 6))
+    fprintf (stderr, "%s: ", PGM);
+
+  va_start (arg_ptr, format);
+  vfprintf (stderr, format, arg_ptr);
+  va_end (arg_ptr);
+  putc ('\n', stderr);
+  any_error = 1;
+}
+
+/* Print diagnostic message. */
+static void
+inf (const char *format, ...)
+{
+  va_list arg_ptr;
+
+  fflush (stdout);
+  fprintf (stderr, "%s: ", PGM);
+
+  va_start (arg_ptr, format);
+  vfprintf (stderr, format, arg_ptr);
+  va_end (arg_ptr);
+  putc ('\n', stderr);
+}
+
+
+static void *
+xmalloc (size_t n)
+{
+  void *p = malloc (n);
+  if (!p)
+    die ("out of core: %s", strerror (errno));
+  return p;
+}
+
+static void *
+xcalloc (size_t n, size_t m)
+{
+  void *p = calloc (n, m);
+  if (!p)
+    die ("out of core: %s", strerror (errno));
+  return p;
+}
+
+static void *
+xrealloc (void *old, size_t n)
+{
+  void *p = realloc (old, n);
+  if (!p)
+    die ("out of core: %s", strerror (errno));
+  return p;
+}
+
+static char *
+xstrdup (const char *string)
+{
+  void *p = malloc (strlen (string)+1);
+  if (!p)
+    die ("out of core: %s", strerror (errno));
+  strcpy (p, string);
+  return p;
+}
+
+
+/* Uppercase the ascii characters in STRING.  */
+static char *
+ascii_strupr (char *string)
+{
+  char *p;
+
+  for (p = string; *p; p++)
+    if (!(*p & 0x80))
+      *p = toupper (*p);
+  return string;
+}
+
+
+/* Return the current date as an ISO string.  */
+const char *
+isodatestring (void)
+{
+  static char buffer[11+5];
+  struct tm *tp;
+  time_t atime;
+
+  if (opt_date && *opt_date)
+    atime = strtoul (opt_date, NULL, 10);
+  else
+    atime = time (NULL);
+  if (atime < 0)
+    strcpy (buffer, "????" "-??" "-??");
+  else
+    {
+      tp = gmtime (&atime);
+      sprintf (buffer,"%04d-%02d-%02d",
+               1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
+    }
+  return buffer;
+}
+
+
+/* Add NAME to the list of predefined macros which are global for all
+   files.  */
+static void
+add_predefined_macro (const char *name)
+{
+  macro_t m;
+
+  for (m=predefinedmacrolist; m; m = m->next)
+    if (!strcmp (m->name, name))
+      break;
+  if (!m)
+    {
+      m = xcalloc (1, sizeof *m + strlen (name));
+      strcpy (m->name, name);
+      m->next = predefinedmacrolist;
+      predefinedmacrolist = m;
+    }
+}
+
+
+/* Create or update a macro with name MACRONAME and set its values TO
+   MACROVALUE.  Note that ownership of the macro value is transferred
+   to this function.  */
+static void
+set_macro (const char *macroname, char *macrovalue)
+{
+  macro_t m;
+
+  for (m=macrolist; m; m = m->next)
+    if (!strcmp (m->name, macroname))
+      break;
+  if (m)
+    free (m->value);
+  else
+    {
+      m = xcalloc (1, sizeof *m + strlen (macroname));
+      strcpy (m->name, macroname);
+      m->next = macrolist;
+      macrolist = m;
+    }
+  m->value = macrovalue;
+  macrovalue = NULL;
+}
+
+
+/* Create or update a variable with name and value given in NAMEANDVALUE.  */
+static void
+set_variable (char *nameandvalue)
+{
+  macro_t m;
+  const char *value;
+  char *p;
+
+  for (p = nameandvalue; *p && *p != ' ' && *p != '\t'; p++)
+    ;
+  if (!*p)
+    value = "";
+  else
+    {
+      *p++ = 0;
+      while (*p == ' ' || *p == '\t')
+        p++;
+      value = p;
+    }
+
+  for (m=variablelist; m; m = m->next)
+    if (!strcmp (m->name, nameandvalue))
+      break;
+  if (m)
+    free (m->value);
+  else
+    {
+      m = xcalloc (1, sizeof *m + strlen (nameandvalue));
+      strcpy (m->name, nameandvalue);
+      m->next = variablelist;
+      variablelist = m;
+    }
+  m->value = xstrdup (value);
+}
+
+
+/* Return true if the macro or variable NAME is set, i.e. not the
+   empty string and not evaluating to 0.  */
+static int
+macro_set_p (const char *name)
+{
+  macro_t m;
+
+  for (m = macrolist; m ; m = m->next)
+    if (!strcmp (m->name, name))
+      break;
+  if (!m)
+    for (m = variablelist; m ; m = m->next)
+      if (!strcmp (m->name, name))
+        break;
+  if (!m || !m->value || !*m->value)
+    return 0;
+  if ((*m->value & 0x80) || !isdigit (*m->value))
+    return 1; /* Not a digit but some other string.  */
+  return !!atoi (m->value);
+}
+
+
+/* Evaluate the current conditions.  */
+static void
+evaluate_conditions (const char *fname, int lnr)
+{
+  int i;
+
+  /* for (i=0; i < condition_stack_idx; i++) */
+  /*   inf ("%s:%d:   stack[%d] %s %s %c", */
+  /*        fname, lnr, i, condition_stack[i]->isset? "set":"clr", */
+  /*        condition_stack[i]->name, */
+  /*        (macro_set_p (condition_stack[i]->name) */
+  /*         ^ !condition_stack[i]->isset)? 't':'f'); */
+
+  cond_is_active = 1;
+  cond_in_verbatim = 0;
+  if (condition_stack_idx)
+    {
+      for (i=0; i < condition_stack_idx; i++)
+        {
+          if (condition_stack[i]->manverb)
+            cond_in_verbatim = (macro_set_p (condition_stack[i]->name)
+                                ^ !condition_stack[i]->isset);
+          else if (!(macro_set_p (condition_stack[i]->name)
+                     ^ !condition_stack[i]->isset))
+            {
+              cond_is_active = 0;
+              break;
+            }
+        }
+    }
+
+  /* inf ("%s:%d:   active=%d verbatim=%d", */
+  /*      fname, lnr, cond_is_active, cond_in_verbatim); */
+}
+
+
+/* Push a condition with condition macro NAME onto the stack.  If
+   ISSET is true, a @isset condition is pushed.  */
+static void
+push_condition (const char *name, int isset, const char *fname, int lnr)
+{
+  condition_t cond;
+  int manverb = 0;
+
+  if (condition_stack_idx >= MAX_CONDITION_NESTING)
+    {
+      err ("%s:%d: condition nested too deep", fname, lnr);
+      return;
+    }
+
+  if (!strcmp (name, "manverb"))
+    {
+      if (!isset)
+        {
+          err ("%s:%d: using \"@ifclear manverb\" is not allowed", fname, lnr);
+          return;
+        }
+      manverb = 1;
+    }
+
+  cond = xcalloc (1, sizeof *cond + strlen (name));
+  cond->manverb = manverb;
+  cond->isset = isset;
+  strcpy (cond->name, name);
+
+  condition_stack[condition_stack_idx++] = cond;
+  evaluate_conditions (fname, lnr);
+}
+
+
+/* Remove the last condition from the stack.  ISSET is used for error
+   reporting.  */
+static void
+pop_condition (int isset, const char *fname, int lnr)
+{
+  if (!condition_stack_idx)
+    {
+      err ("%s:%d: unbalanced \"@end %s\"",
+           fname, lnr, isset?"isset":"isclear");
+      return;
+    }
+  condition_stack_idx--;
+  free (condition_stack[condition_stack_idx]);
+  condition_stack[condition_stack_idx] = NULL;
+  evaluate_conditions (fname, lnr);
+}
+
+
+
+/* Return a section buffer for the section NAME.  Allocate a new buffer
+   if this is a new section.  Keep track of the sections in THEPAGE.
+   This function may reallocate the section array in THEPAGE.  */
+static section_buffer_t
+get_section_buffer (const char *name)
+{
+  int i;
+  section_buffer_t sect;
+
+  /* If there is no section we put everything into the required NAME
+     section.  Given that this is the first one listed it is likely
+     that error are easily visible.  */
+  if (!name)
+    name = "NAME";
+
+  for (i=0; i < thepage.n_sections; i++)
+    {
+      sect = thepage.sections + i;
+      if (sect->name && !strcmp (name, sect->name))
+        return sect;
+    }
+  for (i=0; i < thepage.n_sections; i++)
+    if (!thepage.sections[i].name)
+      break;
+  if (thepage.n_sections && i < thepage.n_sections)
+    sect = thepage.sections + i;
+  else
+    {
+      /* We need to allocate or reallocate the section array.  */
+      size_t old_n = thepage.n_sections;
+      size_t new_n = 20;
+
+      if (!old_n)
+        thepage.sections = xcalloc (new_n, sizeof *thepage.sections);
+      else
+        {
+          thepage.sections = xrealloc (thepage.sections,
+                                       ((old_n + new_n)
+                                        * sizeof *thepage.sections));
+          memset (thepage.sections + old_n, 0,
+                  new_n * sizeof *thepage.sections);
+        }
+      thepage.n_sections += new_n;
+
+      /* Setup the tail pointers.  */
+      for (i=old_n; i < thepage.n_sections; i++)
+        {
+          sect = thepage.sections + i;
+          sect->lines_tail = &sect->lines;
+        }
+      sect = thepage.sections + old_n;
+    }
+
+  /* Store the name.  */
+  assert (!sect->name);
+  sect->name = xstrdup (name);
+  return sect;
+}
+
+
+
+/* Add the content of LINE to the section named SECTNAME.  */
+static void
+add_content (const char *sectname, char *line, int verbatim)
+{
+  section_buffer_t sect;
+  line_buffer_t lb;
+
+  sect = get_section_buffer (sectname);
+  if (sect->last_line && !sect->last_line->verbatim == !verbatim)
+    {
+      /* Lets append that line to the last one.  We do this to keep
+         all lines of the same kind (i.e.verbatim or not) together in
+         one large buffer.  */
+      size_t n1, n;
+
+      lb = sect->last_line;
+      n1 = strlen (lb->line);
+      n = n1 + 1 + strlen (line) + 1;
+      lb->line = xrealloc (lb->line, n);
+      strcpy (lb->line+n1, "\n");
+      strcpy (lb->line+n1+1, line);
+    }
+  else
+    {
+      lb = xcalloc (1, sizeof *lb);
+      lb->verbatim = verbatim;
+      lb->line = xstrdup (line);
+      sect->last_line = lb;
+      *sect->lines_tail = lb;
+      sect->lines_tail = &lb->next;
+    }
+}
+
+
+/* Prepare for a new man page using the filename NAME. */
+static void
+start_page (char *name)
+{
+  if (verbose)
+    inf ("starting page '%s'", name);
+  assert (!thepage.name);
+  thepage.name = xstrdup (name);
+  thepage.n_sections = 0;
+}
+
+
+/* Write the .TH entry of the current page.  Return -1 if there is a
+   problem with the page. */
+static int
+write_th (FILE *fp)
+{
+  char *name, *p;
+
+  fputs (".\\\" Created from Texinfo source by yat2m " VERSION "\n", fp);
+
+  name = ascii_strupr (xstrdup (thepage.name));
+  p = strrchr (name, '.');
+  if (!p || !p[1])
+    {
+      err ("no section name in man page '%s'", thepage.name);
+      free (name);
+      return -1;
+    }
+  *p++ = 0;
+  fprintf (fp, ".TH %s %s %s \"%s\" \"%s\"\n",
+           name, p, isodatestring (), opt_release, opt_source);
+  free (name);
+  return 0;
+}
+
+
+/* Process the texinfo command COMMAND (without the leading @) and
+   write output if needed to FP. REST is the remainer of the line
+   which should either point to an opening brace or to a white space.
+   The function returns the number of characters already processed
+   from REST.  LEN is the usable length of REST.  TABLE_LEVEL is used to
+   control the indentation of tables.  */
+static size_t
+proc_texi_cmd (FILE *fp, const char *command, const char *rest, size_t len,
+               int *table_level, int *eol_action)
+{
+  static struct {
+    const char *name;    /* Name of the command.  */
+    int what;            /* What to do with this command. */
+    const char *lead_in; /* String to print with a opening brace.  */
+    const char *lead_out;/* String to print with the closing brace. */
+  } cmdtbl[] = {
+    { "command", 0, "\\fB", "\\fR" },
+    { "code",    0, "\\fB", "\\fR" },
+    { "url",     0, "\\fB", "\\fR" },
+    { "sc",      0, "\\fB", "\\fR" },
+    { "var",     0, "\\fI", "\\fR" },
+    { "samp",    0, "\\(aq", "\\(aq"  },
+    { "file",    0, "\\(oq\\fI","\\fR\\(cq" },
+    { "env",     0, "\\(oq\\fI","\\fR\\(cq" },
+    { "acronym", 0 },
+    { "dfn",     0 },
+    { "option",  0, "\\fB", "\\fR"   },
+    { "example", 1, ".RS 2\n.nf\n" },
+    { "smallexample", 1, ".RS 2\n.nf\n" },
+    { "asis",    7 },
+    { "anchor",  7 },
+    { "cartouche", 1 },
+    { "ref",     0, "[", "]" },
+    { "xref",    0, "See: [", "]" },
+    { "pxref",   0, "see: [", "]" },
+    { "uref",    0, "(\\fB", "\\fR)" },
+    { "footnote",0, " ([", "])" },
+    { "emph",    0, "\\fI", "\\fR" },
+    { "w",       1 },
+    { "c",       5 },
+    { "efindex", 1 },
+    { "opindex", 1 },
+    { "cpindex", 1 },
+    { "cindex",  1 },
+    { "noindent", 0 },
+    { "section", 1 },
+    { "chapter", 1 },
+    { "subsection", 6, "\n.SS " },
+    { "chapheading", 0},
+    { "item",    2, ".TP\n.B " },
+    { "itemx",   2, ".TQ\n.B " },
+    { "table",   3 },
+    { "itemize",   3 },
+    { "bullet",  0, "* " },
+    { "*",       0, "\n.br"},
+    { "/",       0 },
+    { "end",     4 },
+    { "quotation",1, ".RS\n\\fB" },
+    { "value", 8 },
+    { NULL }
+  };
+  size_t n;
+  int i;
+  const char *s;
+  const char *lead_out = NULL;
+  int ignore_args = 0;
+
+  for (i=0; cmdtbl[i].name && strcmp (cmdtbl[i].name, command); i++)
+    ;
+  if (cmdtbl[i].name)
+    {
+      s = cmdtbl[i].lead_in;
+      if (s)
+        fputs (s, fp);
+      lead_out = cmdtbl[i].lead_out;
+      switch (cmdtbl[i].what)
+        {
+        case 1: /* Throw away the entire line.  */
+          s = memchr (rest, '\n', len);
+          return s? (s-rest)+1 : len;
+        case 2: /* Handle @item.  */
+          break;
+        case 3: /* Handle table.  */
+          if (++(*table_level) > 1)
+            fputs (".RS\n", fp);
+          /* Now throw away the entire line. */
+          s = memchr (rest, '\n', len);
+          return s? (s-rest)+1 : len;
+          break;
+        case 4: /* Handle end.  */
+          for (s=rest, n=len; n && (*s == ' ' || *s == '\t'); s++, n--)
+            ;
+          if (n >= 5 && !memcmp (s, "table", 5)
+              && (!n || s[5] == ' ' || s[5] == '\t' || s[5] == '\n'))
+            {
+              if ((*table_level)-- > 1)
+                fputs (".RE\n", fp);
+              else
+                fputs (".P\n", fp);
+            }
+          else if (n >= 7 && !memcmp (s, "example", 7)
+              && (!n || s[7] == ' ' || s[7] == '\t' || s[7] == '\n'))
+            {
+              fputs (".fi\n.RE\n", fp);
+            }
+          else if (n >= 12 && !memcmp (s, "smallexample", 12)
+              && (!n || s[12] == ' ' || s[12] == '\t' || s[12] == '\n'))
+            {
+              fputs (".fi\n.RE\n", fp);
+            }
+          else if (n >= 9 && !memcmp (s, "quotation", 9)
+              && (!n || s[9] == ' ' || s[9] == '\t' || s[9] == '\n'))
+            {
+              fputs ("\\fR\n.RE\n", fp);
+            }
+          /* Now throw away the entire line. */
+          s = memchr (rest, '\n', len);
+          return s? (s-rest)+1 : len;
+        case 5: /* Handle special comments. */
+          for (s=rest, n=len; n && (*s == ' ' || *s == '\t'); s++, n--)
+            ;
+          if (n >= 4 && !memcmp (s, "man:", 4))
+            {
+              for (s+=4, n-=4; n && *s != '\n'; n--, s++)
+                putc (*s, fp);
+              putc ('\n', fp);
+            }
+          /* Now throw away the entire line. */
+          s = memchr (rest, '\n', len);
+          return s? (s-rest)+1 : len;
+        case 6:
+          *eol_action = 1;
+          break;
+        case 7:
+          ignore_args = 1;
+          break;
+        case 8:
+          ignore_args = 1;
+          if (*rest != '{')
+            {
+              err ("opening brace for command '%s' missing", command);
+              return len;
+            }
+          else
+            {
+              /* Find closing brace.  */
+              for (s=rest+1, n=1; *s && n < len; s++, n++)
+                if (*s == '}')
+                  break;
+              if (*s != '}')
+                {
+                  err ("closing brace for command '%s' not found", command);
+                  return len;
+                }
+              else
+                {
+                  size_t len = s - (rest + 1);
+                  macro_t m;
+
+                  for (m = variablelist; m; m = m->next)
+                    if (strlen (m->name) == len
+                        &&!strncmp (m->name, rest+1, len))
+                      break;
+                  if (m)
+                    fputs (m->value, fp);
+                  else
+                    inf ("texinfo variable '%.*s' is not set",
+                         (int)len, rest+1);
+                }
+            }
+          break;
+        default:
+          break;
+        }
+    }
+  else /* macro */
+    {
+      macro_t m;
+
+      for (m = macrolist; m ; m = m->next)
+        if (!strcmp (m->name, command))
+            break;
+      if (m)
+        {
+          proc_texi_buffer (fp, m->value, strlen (m->value),
+                            table_level, eol_action);
+          ignore_args = 1; /* Parameterized macros are not yet supported. */
+        }
+      else
+        inf ("texinfo command '%s' not supported (%.*s)", command,
+             (int)((s = memchr (rest, '\n', len)), (s? (s-rest) : len)), rest);
+    }
+
+  if (*rest == '{')
+    {
+      /* Find matching closing brace.  */
+      for (s=rest+1, n=1, i=1; i && *s && n < len; s++, n++)
+        if (*s == '{')
+          i++;
+        else if (*s == '}')
+          i--;
+      if (i)
+        {
+          err ("closing brace for command '%s' not found", command);
+          return len;
+        }
+      if (n > 2 && !ignore_args)
+        proc_texi_buffer (fp, rest+1, n-2, table_level, eol_action);
+    }
+  else
+    n = 0;
+
+  if (lead_out)
+    fputs (lead_out, fp);
+
+  return n;
+}
+
+
+
+/* Process the string LINE with LEN bytes of Texinfo content. */
+static void
+proc_texi_buffer (FILE *fp, const char *line, size_t len,
+                  int *table_level, int *eol_action)
+{
+  const char *s;
+  char cmdbuf[256];
+  int cmdidx = 0;
+  int in_cmd = 0;
+  size_t n;
+
+  for (s=line; *s && len; s++, len--)
+    {
+      if (in_cmd)
+        {
+          if (in_cmd == 1)
+            {
+              switch (*s)
+                {
+                case '@': case '{': case '}':
+                  putc (*s, fp); in_cmd = 0;
+                  break;
+                case ':': /* Not ending a sentence flag.  */
+                  in_cmd = 0;
+                  break;
+                case '.': case '!': case '?': /* Ending a sentence. */
+                  putc (*s, fp); in_cmd = 0;
+                  break;
+                case ' ': case '\t': case '\n': /* Non collapsing spaces.  */
+                  putc (*s, fp); in_cmd = 0;
+                  break;
+                default:
+                  cmdidx = 0;
+                  cmdbuf[cmdidx++] = *s;
+                  in_cmd++;
+                  break;
+                }
+            }
+          else if (*s == '{' || *s == ' ' || *s == '\t' || *s == '\n')
+            {
+              cmdbuf[cmdidx] = 0;
+              n = proc_texi_cmd (fp, cmdbuf, s, len, table_level, eol_action);
+              assert (n <= len);
+              s += n; len -= n;
+              s--; len++;
+              in_cmd = 0;
+            }
+          else if (cmdidx < sizeof cmdbuf -1)
+            cmdbuf[cmdidx++] = *s;
+          else
+            {
+              err ("texinfo command too long - ignored");
+              in_cmd = 0;
+            }
+        }
+      else if (*s == '@')
+        in_cmd = 1;
+      else if (*s == '\n')
+        {
+          switch (*eol_action)
+            {
+            case 1: /* Create a dummy paragraph. */
+              fputs ("\n\\ \n", fp);
+              break;
+            default:
+              putc (*s, fp);
+            }
+          *eol_action = 0;
+        }
+      else if (*s == '\\')
+        fputs ("\\\\", fp);
+      else
+        putc (*s, fp);
+    }
+
+  if (in_cmd > 1)
+    {
+      cmdbuf[cmdidx] = 0;
+      n = proc_texi_cmd (fp, cmdbuf, s, len, table_level, eol_action);
+      assert (n <= len);
+      s += n; len -= n;
+      s--; len++;
+      /* in_cmd = 0; -- doc only */
+    }
+}
+
+
+/* Do something with the Texinfo line LINE.  */
+static void
+parse_texi_line (FILE *fp, const char *line, int *table_level)
+{
+  int eol_action = 0;
+
+  /* A quick test whether there are any texinfo commands.  */
+  if (!strchr (line, '@'))
+    {
+      fputs (line, fp);
+      putc ('\n', fp);
+      return;
+    }
+  proc_texi_buffer (fp, line, strlen (line), table_level, &eol_action);
+  putc ('\n', fp);
+}
+
+
+/* Write all the lines LINES to FP.  */
+static void
+write_content (FILE *fp, line_buffer_t lines)
+{
+  line_buffer_t line;
+  int table_level = 0;
+
+  for (line = lines; line; line = line->next)
+    {
+      if (line->verbatim)
+        {
+          fputs (line->line, fp);
+          putc ('\n', fp);
+        }
+      else
+        {
+/*           fputs ("TEXI---", fp); */
+/*           fputs (line->line, fp); */
+/*           fputs ("---\n", fp); */
+          parse_texi_line (fp, line->line, &table_level);
+        }
+    }
+}
+
+
+
+static int
+is_standard_section (const char *name)
+{
+  int i;
+  const char *s;
+
+  for (i=0; (s=standard_sections[i]); i++)
+    if (!strcmp (s, name))
+      return 1;
+  return 0;
+}
+
+
+/* Finish a page; that is sort the data and write it out to the file.  */
+static void
+finish_page (void)
+{
+  FILE *fp;
+  section_buffer_t sect = NULL;
+  int idx;
+  const char *s;
+  int i;
+
+  if (!thepage.name)
+    return; /* No page active.  */
+
+  if (verbose)
+    inf ("finishing page '%s'", thepage.name);
+
+  if (opt_select)
+    {
+      if (!strcmp (opt_select, thepage.name))
+        {
+          inf ("selected '%s'", thepage.name );
+          fp = stdout;
+        }
+      else
+        {
+          fp = fopen ( "/dev/null", "w" );
+          if (!fp)
+            die ("failed to open /dev/null: %s\n", strerror (errno));
+        }
+    }
+  else if (opt_store)
+    {
+      inf ("writing '%s'", thepage.name );
+      fp = fopen ( thepage.name, "w" );
+      if (!fp)
+        die ("failed to create '%s': %s\n", thepage.name, strerror (errno));
+    }
+  else
+    fp = stdout;
+
+  if (write_th (fp))
+    goto leave;
+
+  for (idx=0; (s=standard_sections[idx]); idx++)
+    {
+      for (i=0; i < thepage.n_sections; i++)
+        {
+          sect = thepage.sections + i;
+          if (sect->name && !strcmp (s, sect->name))
+            break;
+        }
+      if (i == thepage.n_sections)
+        sect = NULL;
+
+      if (sect)
+        {
+          fprintf (fp, ".SH %s\n", sect->name);
+          write_content (fp, sect->lines);
+          /* Now continue with all non standard sections directly
+             following this one. */
+          for (i++; i < thepage.n_sections; i++)
+            {
+              sect = thepage.sections + i;
+              if (sect->name && is_standard_section (sect->name))
+                break;
+              if (sect->name)
+                {
+                  fprintf (fp, ".SH %s\n", sect->name);
+                  write_content (fp, sect->lines);
+                }
+            }
+
+        }
+    }
+
+
+ leave:
+  if (fp != stdout)
+    fclose (fp);
+  free (thepage.name);
+  thepage.name = NULL;
+  /* FIXME: Cleanup the content.  */
+}
+
+
+
+
+/* Parse one Texinfo file and create manpages according to the
+   embedded instructions.  */
+static void
+parse_file (const char *fname, FILE *fp, char **section_name, int in_pause)
+{
+  char *line;
+  int lnr = 0;
+  /* Fixme: The following state variables don't carry over to include
+     files. */
+  int skip_to_end = 0;        /* Used to skip over menu entries. */
+  int skip_sect_line = 0;     /* Skip after @mansect.  */
+  int item_indent = 0;        /* How far is the current @item indented.  */
+
+  /* Helper to define a macro. */
+  char *macroname = NULL;
+  char *macrovalue = NULL;
+  size_t macrovaluesize = 0;
+  size_t macrovalueused = 0;
+
+  line = xmalloc (LINESIZE);
+  while (fgets (line, LINESIZE, fp))
+    {
+      size_t n = strlen (line);
+      int got_line = 0;
+      char *p, *pend;
+
+      lnr++;
+      if (!n || line[n-1] != '\n')
+        {
+          err ("%s:%d: trailing linefeed missing, line too long or "
+               "embedded Nul character", fname, lnr);
+          break;
+        }
+      line[--n] = 0;
+
+      /* Kludge to allow indentation of tables.  */
+      for (p=line; *p == ' ' || *p == '\t'; p++)
+        ;
+      if (*p)
+        {
+          if (*p == '@' && !strncmp (p+1, "item", 4))
+            item_indent = p - line;  /* Set a new indent level.  */
+          else if (p - line < item_indent)
+            item_indent = 0;         /* Switch off indention.  */
+
+          if (item_indent)
+            {
+              memmove (line, line+item_indent, n - item_indent + 1);
+              n -= item_indent;
+            }
+        }
+
+
+      if (*line == '@')
+        {
+          for (p=line+1, n=1; *p && *p != ' ' && *p != '\t'; p++)
+            n++;
+          while (*p == ' ' || *p == '\t')
+            p++;
+        }
+      else
+        p = line;
+
+      /* Take action on macro.  */
+      if (macroname)
+        {
+          if (n == 4 && !memcmp (line, "@end", 4)
+              && (line[4]==' '||line[4]=='\t'||!line[4])
+              && !strncmp (p, "macro", 5)
+              && (p[5]==' '||p[5]=='\t'||!p[5]))
+            {
+              if (macrovalueused)
+                macrovalue[--macrovalueused] = 0; /* Kill the last LF. */
+              macrovalue[macrovalueused] = 0;     /* Terminate macro. */
+              macrovalue = xrealloc (macrovalue, macrovalueused+1);
+
+              set_macro (macroname, macrovalue);
+              macrovalue = NULL;
+              free (macroname);
+              macroname = NULL;
+            }
+          else
+            {
+              if (macrovalueused + strlen (line) + 2 >= macrovaluesize)
+                {
+                  macrovaluesize += strlen (line) + 256;
+                  macrovalue = xrealloc (macrovalue,  macrovaluesize);
+                }
+              strcpy (macrovalue+macrovalueused, line);
+              macrovalueused += strlen (line);
+              macrovalue[macrovalueused++] = '\n';
+            }
+          continue;
+        }
+
+
+      if (n >= 5 && !memcmp (line, "@node", 5)
+          && (line[5]==' '||line[5]=='\t'||!line[5]))
+        {
+          /* Completey ignore @node lines.  */
+          continue;
+        }
+
+
+      if (skip_sect_line)
+        {
+          skip_sect_line = 0;
+          if (!strncmp (line, "@section", 8)
+              || !strncmp (line, "@subsection", 11)
+              || !strncmp (line, "@chapheading", 12))
+            continue;
+        }
+
+      /* We only parse lines we need and ignore the rest.  There are a
+         few macros used to control this as well as one @ifset
+         command.  Parts we know about are saved away into containers
+         separate for each section. */
+
+      /* First process ifset/ifclear commands. */
+      if (*line == '@')
+        {
+          if (n == 6 && !memcmp (line, "@ifset", 6)
+                   && (line[6]==' '||line[6]=='\t'))
+            {
+              for (p=line+7; *p == ' ' || *p == '\t'; p++)
+                ;
+              if (!*p)
+                {
+                  err ("%s:%d: name missing after \"@ifset\"", fname, lnr);
+                  continue;
+                }
+              for (pend=p; *pend && *pend != ' ' && *pend != '\t'; pend++)
+                ;
+              *pend = 0;  /* Ignore rest of the line.  */
+              push_condition (p, 1, fname, lnr);
+              continue;
+            }
+          else if (n == 8 && !memcmp (line, "@ifclear", 8)
+                   && (line[8]==' '||line[8]=='\t'))
+            {
+              for (p=line+9; *p == ' ' || *p == '\t'; p++)
+                ;
+              if (!*p)
+                {
+                  err ("%s:%d: name missing after \"@ifsclear\"", fname, lnr);
+                  continue;
+                }
+              for (pend=p; *pend && *pend != ' ' && *pend != '\t'; pend++)
+                ;
+              *pend = 0;  /* Ignore rest of the line.  */
+              push_condition (p, 0, fname, lnr);
+              continue;
+            }
+          else if (n == 4 && !memcmp (line, "@end", 4)
+                   && (line[4]==' '||line[4]=='\t')
+                   && !strncmp (p, "ifset", 5)
+                   && (p[5]==' '||p[5]=='\t'||!p[5]))
+            {
+              pop_condition (1, fname, lnr);
+              continue;
+            }
+          else if (n == 4 && !memcmp (line, "@end", 4)
+                   && (line[4]==' '||line[4]=='\t')
+                   && !strncmp (p, "ifclear", 7)
+                   && (p[7]==' '||p[7]=='\t'||!p[7]))
+            {
+              pop_condition (0, fname, lnr);
+              continue;
+            }
+        }
+
+      /* Take action on ifset/ifclear.  */
+      if (!cond_is_active)
+        continue;
+
+      /* Process commands. */
+      if (*line == '@')
+        {
+          if (skip_to_end
+              && n == 4 && !memcmp (line, "@end", 4)
+              && (line[4]==' '||line[4]=='\t'||!line[4]))
+            {
+              skip_to_end = 0;
+            }
+          else if (cond_in_verbatim)
+            {
+                got_line = 1;
+            }
+          else if (n == 6 && !memcmp (line, "@macro", 6))
+            {
+              macroname = xstrdup (p);
+              macrovalue = xmalloc ((macrovaluesize = 1024));
+              macrovalueused = 0;
+            }
+          else if (n == 4 && !memcmp (line, "@set", 4))
+            {
+              set_variable (p);
+            }
+          else if (n == 8 && !memcmp (line, "@manpage", 8))
+            {
+              free (*section_name);
+              *section_name = NULL;
+              finish_page ();
+              start_page (p);
+              in_pause = 0;
+            }
+          else if (n == 8 && !memcmp (line, "@mansect", 8))
+            {
+              if (!thepage.name)
+                err ("%s:%d: section outside of a man page", fname, lnr);
+              else
+                {
+                  free (*section_name);
+                  *section_name = ascii_strupr (xstrdup (p));
+                  in_pause = 0;
+                  skip_sect_line = 1;
+                }
+            }
+          else if (n == 9 && !memcmp (line, "@manpause", 9))
+            {
+              if (!*section_name)
+                err ("%s:%d: pausing outside of a man section", fname, lnr);
+              else if (in_pause)
+                err ("%s:%d: already pausing", fname, lnr);
+              else
+                in_pause = 1;
+            }
+          else if (n == 8 && !memcmp (line, "@mancont", 8))
+            {
+              if (!*section_name)
+                err ("%s:%d: continue outside of a man section", fname, lnr);
+              else if (!in_pause)
+                err ("%s:%d: continue while not pausing", fname, lnr);
+              else
+                in_pause = 0;
+            }
+          else if (n == 5 && !memcmp (line, "@menu", 5)
+                   && (line[5]==' '||line[5]=='\t'||!line[5]))
+            {
+              skip_to_end = 1;
+            }
+          else if (n == 8 && !memcmp (line, "@include", 8)
+                   && (line[8]==' '||line[8]=='\t'||!line[8]))
+            {
+              char *incname = xstrdup (p);
+              FILE *incfp = fopen (incname, "r");
+
+              if (!incfp && opt_include && *opt_include && *p != '/')
+                {
+                  free (incname);
+                  incname = xmalloc (strlen (opt_include) + 1
+                                     + strlen (p) + 1);
+                  strcpy (incname, opt_include);
+                  if ( incname[strlen (incname)-1] != '/' )
+                    strcat (incname, "/");
+                  strcat (incname, p);
+                  incfp = fopen (incname, "r");
+                }
+
+              if (!incfp)
+                err ("can't open include file '%s': %s",
+                     incname, strerror (errno));
+              else
+                {
+                  parse_file (incname, incfp, section_name, in_pause);
+                  fclose (incfp);
+                }
+              free (incname);
+            }
+          else if (n == 4 && !memcmp (line, "@bye", 4)
+                   && (line[4]==' '||line[4]=='\t'||!line[4]))
+            {
+              break;
+            }
+          else if (!skip_to_end)
+            got_line = 1;
+        }
+      else if (!skip_to_end)
+        got_line = 1;
+
+      if (got_line && cond_in_verbatim)
+        add_content (*section_name, line, 1);
+      else if (got_line && thepage.name && *section_name && !in_pause)
+        add_content (*section_name, line, 0);
+
+    }
+  if (ferror (fp))
+    err ("%s:%d: read error: %s", fname, lnr, strerror (errno));
+  free (macroname);
+  free (macrovalue);
+  free (line);
+}
+
+
+static void
+top_parse_file (const char *fname, FILE *fp)
+{
+  char *section_name = NULL;  /* Name of the current section or NULL
+                                 if not in a section.  */
+  macro_t m;
+
+  while (macrolist)
+    {
+      macro_t next = macrolist->next;
+      free (macrolist->value);
+      free (macrolist);
+      macrolist = next;
+    }
+  while (variablelist)
+    {
+      macro_t next = variablelist->next;
+      free (variablelist->value);
+      free (variablelist);
+      variablelist = next;
+    }
+  for (m=predefinedmacrolist; m; m = m->next)
+    set_macro (m->name, xstrdup ("1"));
+  cond_is_active = 1;
+  cond_in_verbatim = 0;
+
+  parse_file (fname, fp, &section_name, 0);
+  free (section_name);
+  finish_page ();
+}
+
+
+int
+main (int argc, char **argv)
+{
+  int last_argc = -1;
+  const char *s;
+
+  opt_source = "GNU";
+  opt_release = "";
+
+  /* Define default macros.  The trick is that these macros are not
+     defined when using the actual texinfo renderer. */
+  add_predefined_macro ("isman");
+  add_predefined_macro ("manverb");
+
+  /* Option parsing.  */
+  if (argc)
+    {
+      argc--; argv++;
+    }
+  while (argc && last_argc != argc )
+    {
+      last_argc = argc;
+      if (!strcmp (*argv, "--"))
+        {
+          argc--; argv++;
+          break;
+        }
+      else if (!strcmp (*argv, "--help"))
+        {
+          puts (
+                "Usage: " PGM " [OPTION] [FILE]\n"
+                "Extract man pages from a Texinfo source.\n\n"
+                "  --source NAME    use NAME as source field\n"
+                "  --release STRING use STRING as the release field\n"
+                "  --date EPOCH     use EPOCH as publication date\n"
+                "  --store          write output using @manpage name\n"
+                "  --select NAME    only output pages with @manpage NAME\n"
+                "  --verbose        enable extra informational output\n"
+                "  --debug          enable additional debug output\n"
+                "  --help           display this help and exit\n"
+                "  -I DIR           also search in include DIR\n"
+                "  -D gpgone        the only usable define\n\n"
+                "With no FILE, or when FILE is -, read standard input.\n\n"
+                "Report bugs to <bugs@g10code.com>.");
+          exit (0);
+        }
+      else if (!strcmp (*argv, "--version"))
+        {
+          puts (PGM " " VERSION "\n"
+               "Copyright (C) 2005 g10 Code GmbH\n"
+               "This program comes with ABSOLUTELY NO WARRANTY.\n"
+               "This is free software, and you are welcome to redistribute it\n"
+                "under certain conditions. See the file COPYING for details.");
+          exit (0);
+        }
+      else if (!strcmp (*argv, "--verbose"))
+        {
+          verbose = 1;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "--quiet"))
+        {
+          quiet = 1;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "--debug"))
+        {
+          verbose = debug = 1;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "--source"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_source = *argv;
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "--release"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_release = *argv;
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "--date"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_date = *argv;
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "--store"))
+        {
+          opt_store = 1;
+          argc--; argv++;
+        }
+      else if (!strcmp (*argv, "--select"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_select = strrchr (*argv, '/');
+              if (opt_select)
+                opt_select++;
+              else
+                opt_select = *argv;
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "-I"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              opt_include = *argv;
+              argc--; argv++;
+            }
+        }
+      else if (!strcmp (*argv, "-D"))
+        {
+          argc--; argv++;
+          if (argc)
+            {
+              add_predefined_macro (*argv);
+              argc--; argv++;
+            }
+        }
+    }
+
+  if (argc > 1)
+    die ("usage: " PGM " [OPTION] [FILE] (try --help for more information)\n");
+
+  /* Take care of supplied timestamp for reproducible builds.  See
+   * https://reproducible-builds.org/specs/source-date-epoch/  */
+  if (!opt_date && (s = getenv ("SOURCE_DATE_EPOCH")) && *s)
+    opt_date = s;
+
+  /* Start processing. */
+  if (argc && strcmp (*argv, "-"))
+    {
+      FILE *fp = fopen (*argv, "rb");
+      if (!fp)
+        die ("%s:0: can't open file: %s", *argv, strerror (errno));
+      top_parse_file (*argv, fp);
+      fclose (fp);
+    }
+  else
+    top_parse_file ("-", stdin);
+
+  return !!any_error;
+}
+
+
+/*
+Local Variables:
+compile-command: "gcc -Wall -g -Wall -o yat2m yat2m.c"
+End:
+*/