Adding upstream version 9.1.upstream/9.1upstream

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

1 files changed, 325 insertions, 0 deletions

diff --git a/src/unexpand.c b/src/unexpand.c
new file mode 100644
index 0000000..7d6100f
--- /dev/null
+++ b/src/unexpand.c
@@ -0,0 +1,325 @@
+/* unexpand - convert blanks to tabs
+   Copyright (C) 1989-2022 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/>.  */
+
+/* By default, convert only maximal strings of initial blanks and tabs
+   into tabs.
+   Preserves backspace characters in the output; they decrement the
+   column count for tab calculations.
+   The default action is equivalent to -8.
+
+   Options:
+   --tabs=tab1[,tab2[,...]]
+   -t tab1[,tab2[,...]]
+   -tab1[,tab2[,...]]	If only one tab stop is given, set the tabs tab1
+                        columns apart instead of the default 8.  Otherwise,
+                        set the tabs at columns tab1, tab2, etc. (numbered from
+                        0); preserve any blanks beyond the tab stops given.
+   --all
+   -a			Use tabs wherever they would replace 2 or more blanks,
+                        not just at the beginnings of lines.
+
+   David MacKenzie <djm@gnu.ai.mit.edu> */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <getopt.h>
+#include <sys/types.h>
+#include "system.h"
+#include "die.h"
+
+#include "expand-common.h"
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "unexpand"
+
+#define AUTHORS proper_name ("David MacKenzie")
+
+
+
+/* For long options that have no equivalent short option, use a
+   non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
+enum
+{
+  CONVERT_FIRST_ONLY_OPTION = CHAR_MAX + 1
+};
+
+static struct option const longopts[] =
+{
+  {"tabs", required_argument, NULL, 't'},
+  {"all", no_argument, NULL, 'a'},
+  {"first-only", no_argument, NULL, CONVERT_FIRST_ONLY_OPTION},
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {NULL, 0, NULL, 0}
+};
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    emit_try_help ();
+  else
+    {
+      printf (_("\
+Usage: %s [OPTION]... [FILE]...\n\
+"),
+              program_name);
+      fputs (_("\
+Convert blanks in each FILE to tabs, writing to standard output.\n\
+"), stdout);
+
+      emit_stdin_note ();
+      emit_mandatory_arg_note ();
+
+      fputs (_("\
+  -a, --all        convert all blanks, instead of just initial blanks\n\
+      --first-only  convert only leading sequences of blanks (overrides -a)\n\
+  -t, --tabs=N     have tabs N characters apart instead of 8 (enables -a)\n\
+"), stdout);
+      emit_tab_list_info ();
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+/* Change blanks to tabs, writing to stdout.
+   Read each file in 'file_list', in order.  */
+
+static void
+unexpand (void)
+{
+  /* Input stream.  */
+  FILE *fp = next_file (NULL);
+
+  /* The array of pending blanks.  In non-POSIX locales, blanks can
+     include characters other than spaces, so the blanks must be
+     stored, not merely counted.  */
+  char *pending_blank;
+
+  if (!fp)
+    return;
+
+  /* The worst case is a non-blank character, then one blank, then a
+     tab stop, then MAX_COLUMN_WIDTH - 1 blanks, then a non-blank; so
+     allocate MAX_COLUMN_WIDTH bytes to store the blanks.  */
+  pending_blank = xmalloc (max_column_width);
+
+  while (true)
+    {
+      /* Input character, or EOF.  */
+      int c;
+
+      /* If true, perform translations.  */
+      bool convert = true;
+
+
+      /* The following variables have valid values only when CONVERT
+         is true:  */
+
+      /* Column of next input character.  */
+      uintmax_t column = 0;
+
+      /* Column the next input tab stop is on.  */
+      uintmax_t next_tab_column = 0;
+
+      /* Index in TAB_LIST of next tab stop to examine.  */
+      size_t tab_index = 0;
+
+      /* If true, the first pending blank came just before a tab stop.  */
+      bool one_blank_before_tab_stop = false;
+
+      /* If true, the previous input character was a blank.  This is
+         initially true, since initial strings of blanks are treated
+         as if the line was preceded by a blank.  */
+      bool prev_blank = true;
+
+      /* Number of pending columns of blanks.  */
+      size_t pending = 0;
+
+
+      /* Convert a line of text.  */
+
+      do
+        {
+          while ((c = getc (fp)) < 0 && (fp = next_file (fp)))
+            continue;
+
+          if (convert)
+            {
+              bool blank = !! isblank (c);
+
+              if (blank)
+                {
+                  bool last_tab;
+
+                  next_tab_column = get_next_tab_column (column, &tab_index,
+                                                         &last_tab);
+
+                  if (last_tab)
+                    convert = false;
+
+                  if (convert)
+                    {
+                      if (next_tab_column < column)
+                        die (EXIT_FAILURE, 0, _("input line is too long"));
+
+                      if (c == '\t')
+                        {
+                          column = next_tab_column;
+
+                          if (pending)
+                            pending_blank[0] = '\t';
+                        }
+                      else
+                        {
+                          column++;
+
+                          if (! (prev_blank && column == next_tab_column))
+                            {
+                              /* It is not yet known whether the pending blanks
+                                 will be replaced by tabs.  */
+                              if (column == next_tab_column)
+                                one_blank_before_tab_stop = true;
+                              pending_blank[pending++] = c;
+                              prev_blank = true;
+                              continue;
+                            }
+
+                          /* Replace the pending blanks by a tab or two.  */
+                          pending_blank[0] = c = '\t';
+                        }
+
+                      /* Discard pending blanks, unless it was a single
+                         blank just before the previous tab stop.  */
+                      pending = one_blank_before_tab_stop;
+                    }
+                }
+              else if (c == '\b')
+                {
+                  /* Go back one column, and force recalculation of the
+                     next tab stop.  */
+                  column -= !!column;
+                  next_tab_column = column;
+                  tab_index -= !!tab_index;
+                }
+              else
+                {
+                  column++;
+                  if (!column)
+                    die (EXIT_FAILURE, 0, _("input line is too long"));
+                }
+
+              if (pending)
+                {
+                  if (pending > 1 && one_blank_before_tab_stop)
+                    pending_blank[0] = '\t';
+                  if (fwrite (pending_blank, 1, pending, stdout) != pending)
+                    die (EXIT_FAILURE, errno, _("write error"));
+                  pending = 0;
+                  one_blank_before_tab_stop = false;
+                }
+
+              prev_blank = blank;
+              convert &= convert_entire_line || blank;
+            }
+
+          if (c < 0)
+            {
+              free (pending_blank);
+              return;
+            }
+
+          if (putchar (c) < 0)
+            die (EXIT_FAILURE, errno, _("write error"));
+        }
+      while (c != '\n');
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  bool have_tabval = false;
+  uintmax_t tabval IF_LINT ( = 0);
+  int c;
+
+  /* If true, cancel the effect of any -a (explicit or implicit in -t),
+     so that only leading blanks will be considered.  */
+  bool convert_first_only = false;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  atexit (close_stdout);
+
+  while ((c = getopt_long (argc, argv, ",0123456789at:", longopts, NULL))
+         != -1)
+    {
+      switch (c)
+        {
+        case '?':
+          usage (EXIT_FAILURE);
+        case 'a':
+          convert_entire_line = true;
+          break;
+        case 't':
+          convert_entire_line = true;
+          parse_tab_stops (optarg);
+          break;
+        case CONVERT_FIRST_ONLY_OPTION:
+          convert_first_only = true;
+          break;
+        case ',':
+          if (have_tabval)
+            add_tab_stop (tabval);
+          have_tabval = false;
+          break;
+        case_GETOPT_HELP_CHAR;
+        case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+        default:
+          if (!have_tabval)
+            {
+              tabval = 0;
+              have_tabval = true;
+            }
+          if (!DECIMAL_DIGIT_ACCUMULATE (tabval, c - '0', uintmax_t))
+            die (EXIT_FAILURE, 0, _("tab stop value is too large"));
+          break;
+        }
+    }
+
+  if (convert_first_only)
+    convert_entire_line = false;
+
+  if (have_tabval)
+    add_tab_stop (tabval);
+
+  finalize_tab_stops ();
+
+  set_file_list ((optind < argc) ? &argv[optind] : NULL);
+
+  unexpand ();
+
+  cleanup_file_list_stdin ();
+
+  return exit_status;
+}