/* tac - concatenate and print files in reverse
- Copyright (C) 1988-1991, 1995-2006, 2008-2011 Free Software Foundation, Inc.
+ Copyright (C) 1988-2013 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
#include "stdlib--.h"
#include "xfreopen.h"
-/* The official name of this program (e.g., no `g' prefix). */
+/* The official name of this program (e.g., no 'g' prefix). */
#define PROGRAM_NAME "tac"
#define AUTHORS \
/* True if we have ever read standard input. */
static bool have_read_stdin = false;
-/* If true, print `separator' along with the record preceding it
+/* If true, print 'separator' along with the record preceding it
in the file; otherwise with the record following it. */
static bool separator_ends_record;
-/* 0 if `separator' is to be matched as a regular expression;
- otherwise, the length of `separator', used as a sentinel to
+/* 0 if 'separator' is to be matched as a regular expression;
+ otherwise, the length of 'separator', used as a sentinel to
stop the search. */
static size_t sentinel_length;
-/* The length of a match with `separator'. If `sentinel_length' is 0,
- `match_length' is computed every time a match succeeds;
- otherwise, it is simply the length of `separator'. */
+/* The length of a match with 'separator'. If 'sentinel_length' is 0,
+ 'match_length' is computed every time a match succeeds;
+ otherwise, it is simply the length of 'separator'. */
static size_t match_length;
/* The input buffer. */
static char *G_buffer;
-/* The number of bytes to read at once into `buffer'. */
+/* The number of bytes to read at once into 'buffer'. */
static size_t read_size;
-/* The size of `buffer'. This is read_size * 2 + sentinel_length + 2.
- The extra 2 bytes allow `past_end' to have a value beyond the
- end of `G_buffer' and `match_start' to run off the front of `G_buffer'. */
+/* The size of 'buffer'. This is read_size * 2 + sentinel_length + 2.
+ The extra 2 bytes allow 'past_end' to have a value beyond the
+ end of 'G_buffer' and 'match_start' to run off the front of 'G_buffer'. */
static size_t G_buffer_size;
-/* The compiled regular expression representing `separator'. */
+/* The compiled regular expression representing 'separator'. */
static struct re_pattern_buffer compiled_separator;
static char compiled_separator_fastmap[UCHAR_MAX + 1];
static struct re_registers regs;
usage (int status)
{
if (status != EXIT_SUCCESS)
- fprintf (stderr, _("Try `%s --help' for more information.\n"),
- program_name);
+ emit_try_help ();
else
{
printf (_("\
static bool
tac_seekable (int input_fd, const char *file)
{
- /* Pointer to the location in `G_buffer' where the search for
+ /* Pointer to the location in 'G_buffer' where the search for
the next separator will begin. */
char *match_start;
- /* Pointer to one past the rightmost character in `G_buffer' that
+ /* Pointer to one past the rightmost character in 'G_buffer' that
has not been printed yet. */
char *past_end;
- /* Length of the record growing in `G_buffer'. */
+ /* Length of the record growing in 'G_buffer'. */
size_t saved_record_size;
/* Offset in the file of the next read. */
off_t file_pos;
- /* True if `output' has not been called yet for any file.
+ /* True if 'output' has not been called yet for any file.
Only used when the separator is attached to the preceding record. */
bool first_time = true;
char first_char = *separator; /* Speed optimization, non-regexp. */
return true; /* It's an empty file. */
/* Arrange for the first read to lop off enough to leave the rest of the
- file a multiple of `read_size'. Since `read_size' can change, this may
+ file a multiple of 'read_size'. Since 'read_size' can change, this may
not always hold during the program run, but since it usually will, leave
it here for i/o efficiency (page/sector boundaries and all that).
Note: the efficiency gain has not been verified. */
if (saved_record_size == 0)
saved_record_size = read_size;
file_pos -= saved_record_size;
- /* `file_pos' now points to the start of the last (probably partial) block
+ /* 'file_pos' now points to the start of the last (probably partial) block
in the input file. */
if (lseek (input_fd, file_pos, SEEK_SET) < 0)
while (true)
{
- /* Search backward from `match_start' - 1 to `G_buffer' for a match
- with `separator'; for speed, use strncmp if `separator' contains no
+ /* Search backward from 'match_start' - 1 to 'G_buffer' for a match
+ with 'separator'; for speed, use strncmp if 'separator' contains no
metacharacters.
- If the match succeeds, set `match_start' to point to the start of
- the match and `match_length' to the length of the match.
- Otherwise, make `match_start' < `G_buffer'. */
+ If the match succeeds, set 'match_start' to point to the start of
+ the match and 'match_length' to the length of the match.
+ Otherwise, make 'match_start' < 'G_buffer'. */
if (sentinel_length == 0)
{
size_t i = match_start - G_buffer;
}
else
{
- /* `match_length' is constant for non-regexp boundaries. */
+ /* 'match_length' is constant for non-regexp boundaries. */
while (*--match_start != first_char
|| (match_length1 && strncmp (match_start + 1, separator1,
match_length1)))
/* Do nothing. */ ;
}
- /* Check whether we backed off the front of `G_buffer' without finding
- a match for `separator'. */
+ /* Check whether we backed off the front of 'G_buffer' without finding
+ a match for 'separator'. */
if (match_start < G_buffer)
{
if (file_pos == 0)
saved_record_size = past_end - G_buffer;
if (saved_record_size > read_size)
{
- /* `G_buffer_size' is about twice `read_size', so since
- we want to read in another `read_size' bytes before
- the data already in `G_buffer', we need to increase
- `G_buffer_size'. */
+ /* 'G_buffer_size' is about twice 'read_size', so since
+ we want to read in another 'read_size' bytes before
+ the data already in 'G_buffer', we need to increase
+ 'G_buffer_size'. */
char *newbuffer;
size_t offset = sentinel_length ? sentinel_length : 1;
ptrdiff_t match_start_offset = match_start - G_buffer;
The source and destination regions probably overlap. */
memmove (G_buffer + read_size, G_buffer, saved_record_size);
past_end = G_buffer + read_size + saved_record_size;
- /* For non-regexp searches, avoid unneccessary scanning. */
+ /* For non-regexp searches, avoid unnecessary scanning. */
if (sentinel_length)
match_start = G_buffer + read_size;
else
}
else
{
- /* Found a match of `separator'. */
+ /* Found a match of 'separator'. */
if (separator_ends_record)
{
char *match_end = match_start + match_length;
- /* If this match of `separator' isn't at the end of the
+ /* If this match of 'separator' isn't at the end of the
file, print the record. */
if (!first_time || match_end != past_end)
output (match_end, past_end);
}
else
{
- if (fseek (tmp_fp, 0, SEEK_SET) < 0
+ if (fseeko (tmp_fp, 0, SEEK_SET) < 0
|| ftruncate (fileno (tmp_fp), 0) < 0)
{
error (0, errno, _("failed to rewind stream for %s"),
G_buffer = xmalloc (G_buffer_size);
if (sentinel_length)
{
- strcpy (G_buffer, separator);
+ memcpy (G_buffer, separator, sentinel_length + 1);
G_buffer += sentinel_length;
}
else
projects / platform / upstream / coreutils.git / blobdiff