Adding upstream version 8.32.upstream/8.32upstream

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

1 files changed, 309 insertions, 0 deletions

diff --git a/src/fold.c b/src/fold.c
new file mode 100644
index 0000000..2221f72
--- /dev/null
+++ b/src/fold.c
@@ -0,0 +1,309 @@
+/* fold -- wrap each input line to fit in specified width.
+   Copyright (C) 1991-2020 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/>.  */
+
+/* Written by 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 "error.h"
+#include "fadvise.h"
+#include "xdectoint.h"
+
+#define TAB_WIDTH 8
+
+/* The official name of this program (e.g., no 'g' prefix).  */
+#define PROGRAM_NAME "fold"
+
+#define AUTHORS proper_name ("David MacKenzie")
+
+/* If nonzero, try to break on whitespace. */
+static bool break_spaces;
+
+/* If nonzero, count bytes, not column positions. */
+static bool count_bytes;
+
+/* If nonzero, at least one of the files we read was standard input. */
+static bool have_read_stdin;
+
+static char const shortopts[] = "bsw:0::1::2::3::4::5::6::7::8::9::";
+
+static struct option const longopts[] =
+{
+  {"bytes", no_argument, NULL, 'b'},
+  {"spaces", no_argument, NULL, 's'},
+  {"width", required_argument, NULL, 'w'},
+  {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 (_("\
+Wrap input lines in each FILE, writing to standard output.\n\
+"), stdout);
+
+      emit_stdin_note ();
+      emit_mandatory_arg_note ();
+
+      fputs (_("\
+  -b, --bytes         count bytes rather than columns\n\
+  -s, --spaces        break at spaces\n\
+  -w, --width=WIDTH   use WIDTH columns instead of 80\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      emit_ancillary_info (PROGRAM_NAME);
+    }
+  exit (status);
+}
+
+/* Assuming the current column is COLUMN, return the column that
+   printing C will move the cursor to.
+   The first column is 0. */
+
+static size_t
+adjust_column (size_t column, char c)
+{
+  if (!count_bytes)
+    {
+      if (c == '\b')
+        {
+          if (column > 0)
+            column--;
+        }
+      else if (c == '\r')
+        column = 0;
+      else if (c == '\t')
+        column += TAB_WIDTH - column % TAB_WIDTH;
+      else /* if (isprint (c)) */
+        column++;
+    }
+  else
+    column++;
+  return column;
+}
+
+/* Fold file FILENAME, or standard input if FILENAME is "-",
+   to stdout, with maximum line length WIDTH.
+   Return true if successful.  */
+
+static bool
+fold_file (char const *filename, size_t width)
+{
+  FILE *istream;
+  int c;
+  size_t column = 0;		/* Screen column where next char will go. */
+  size_t offset_out = 0;	/* Index in 'line_out' for next char. */
+  static char *line_out = NULL;
+  static size_t allocated_out = 0;
+  int saved_errno;
+
+  if (STREQ (filename, "-"))
+    {
+      istream = stdin;
+      have_read_stdin = true;
+    }
+  else
+    istream = fopen (filename, "r");
+
+  if (istream == NULL)
+    {
+      error (0, errno, "%s", quotef (filename));
+      return false;
+    }
+
+  fadvise (istream, FADVISE_SEQUENTIAL);
+
+  while ((c = getc (istream)) != EOF)
+    {
+      if (offset_out + 1 >= allocated_out)
+        line_out = X2REALLOC (line_out, &allocated_out);
+
+      if (c == '\n')
+        {
+          line_out[offset_out++] = c;
+          fwrite (line_out, sizeof (char), offset_out, stdout);
+          column = offset_out = 0;
+          continue;
+        }
+
+    rescan:
+      column = adjust_column (column, c);
+
+      if (column > width)
+        {
+          /* This character would make the line too long.
+             Print the line plus a newline, and make this character
+             start the next line. */
+          if (break_spaces)
+            {
+              bool found_blank = false;
+              size_t logical_end = offset_out;
+
+              /* Look for the last blank. */
+              while (logical_end)
+                {
+                  --logical_end;
+                  if (isblank (to_uchar (line_out[logical_end])))
+                    {
+                      found_blank = true;
+                      break;
+                    }
+                }
+
+              if (found_blank)
+                {
+                  size_t i;
+
+                  /* Found a blank.  Don't output the part after it. */
+                  logical_end++;
+                  fwrite (line_out, sizeof (char), (size_t) logical_end,
+                          stdout);
+                  putchar ('\n');
+                  /* Move the remainder to the beginning of the next line.
+                     The areas being copied here might overlap. */
+                  memmove (line_out, line_out + logical_end,
+                           offset_out - logical_end);
+                  offset_out -= logical_end;
+                  for (column = i = 0; i < offset_out; i++)
+                    column = adjust_column (column, line_out[i]);
+                  goto rescan;
+                }
+            }
+
+          if (offset_out == 0)
+            {
+              line_out[offset_out++] = c;
+              continue;
+            }
+
+          line_out[offset_out++] = '\n';
+          fwrite (line_out, sizeof (char), (size_t) offset_out, stdout);
+          column = offset_out = 0;
+          goto rescan;
+        }
+
+      line_out[offset_out++] = c;
+    }
+
+  saved_errno = errno;
+
+  if (offset_out)
+    fwrite (line_out, sizeof (char), (size_t) offset_out, stdout);
+
+  if (ferror (istream))
+    {
+      error (0, saved_errno, "%s", quotef (filename));
+      if (!STREQ (filename, "-"))
+        fclose (istream);
+      return false;
+    }
+  if (!STREQ (filename, "-") && fclose (istream) == EOF)
+    {
+      error (0, errno, "%s", quotef (filename));
+      return false;
+    }
+
+  return true;
+}
+
+int
+main (int argc, char **argv)
+{
+  size_t width = 80;
+  int i;
+  int optc;
+  bool ok;
+
+  initialize_main (&argc, &argv);
+  set_program_name (argv[0]);
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  atexit (close_stdout);
+
+  break_spaces = count_bytes = have_read_stdin = false;
+
+  while ((optc = getopt_long (argc, argv, shortopts, longopts, NULL)) != -1)
+    {
+      char optargbuf[2];
+
+      switch (optc)
+        {
+        case 'b':		/* Count bytes rather than columns. */
+          count_bytes = true;
+          break;
+
+        case 's':		/* Break at word boundaries. */
+          break_spaces = true;
+          break;
+
+        case '0': case '1': case '2': case '3': case '4':
+        case '5': case '6': case '7': case '8': case '9':
+          if (optarg)
+            optarg--;
+          else
+            {
+              optargbuf[0] = optc;
+              optargbuf[1] = '\0';
+              optarg = optargbuf;
+            }
+          FALLTHROUGH;
+        case 'w':		/* Line width. */
+          width = xdectoumax (optarg, 1, SIZE_MAX - TAB_WIDTH - 1, "",
+                              _("invalid number of columns"), 0);
+          break;
+
+        case_GETOPT_HELP_CHAR;
+
+        case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+        default:
+          usage (EXIT_FAILURE);
+        }
+    }
+
+  if (argc == optind)
+    ok = fold_file ("-", width);
+  else
+    {
+      ok = true;
+      for (i = optind; i < argc; i++)
+        ok &= fold_file (argv[i], width);
+    }
+
+  if (have_read_stdin && fclose (stdin) == EOF)
+    die (EXIT_FAILURE, errno, "-");
+
+  return ok ? EXIT_SUCCESS : EXIT_FAILURE;
+}