/*************************************************

*               pcregrep program                 *

*************************************************/

/* This is a grep program that uses the PCRE regular expression library to do

its pattern matching. On a Unix or Win32 system it can recurse into

directories.

           Copyright (c) 1997-2008 University of Cambridge

-----------------------------------------------------------------------------

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,

      this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright

      notice, this list of conditions and the following disclaimer in the

      documentation and/or other materials provided with the distribution.

    * Neither the name of the University of Cambridge nor the names of its

      contributors may be used to endorse or promote products derived from

      this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

-----------------------------------------------------------------------------

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <ctype.h>

#include <locale.h>

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/stat.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef SUPPORT_LIBZ

#include <zlib.h>

#endif

#ifdef SUPPORT_LIBBZ2

#include <bzlib.h>

#endif

#include "pcre.h"

#define FALSE 0

#define TRUE 1

typedef int BOOL;

#define MAX_PATTERN_COUNT 100

#if BUFSIZ > 8192

#define MBUFTHIRD BUFSIZ

#else

#define MBUFTHIRD 8192

#endif

/* Values for the "filenames" variable, which specifies options for file name

output. The order is important; it is assumed that a file name is wanted for

all values greater than FN_DEFAULT. */

enum { FN_NONE, FN_DEFAULT, FN_ONLY, FN_NOMATCH_ONLY, FN_FORCE };

/* File reading styles */

enum { FR_PLAIN, FR_LIBZ, FR_LIBBZ2 };

/* Actions for the -d and -D options */

enum { dee_READ, dee_SKIP, dee_RECURSE };

enum { DEE_READ, DEE_SKIP };

/* Actions for special processing options (flag bits) */

#define PO_WORD_MATCH     0x0001

#define PO_LINE_MATCH     0x0002

#define PO_FIXED_STRINGS  0x0004

/* Line ending types */

enum { EL_LF, EL_CR, EL_CRLF, EL_ANY, EL_ANYCRLF };

/*************************************************

*               Global variables                 *

*************************************************/

/* Jeffrey Friedl has some debugging requirements that are not part of the

regular code. */

#ifdef JFRIEDL_DEBUG

static int S_arg = -1;

static unsigned int jfriedl_XR = 0; /* repeat regex attempt this many times */

static unsigned int jfriedl_XT = 0; /* replicate text this many times */

static const char *jfriedl_prefix = "";

static const char *jfriedl_postfix = "";

#endif

static int  endlinetype;

static char *colour_string = (char *)"1;31";

static char *colour_option = NULL;

static char *dee_option = NULL;

static char *DEE_option = NULL;

static char *newline = NULL;

static char *pattern_filename = NULL;

static char *stdin_name = (char *)"(standard input)";

static char *locale = NULL;

static const unsigned char *pcretables = NULL;

static int  pattern_count = 0;

static pcre **pattern_list = NULL;

static pcre_extra **hints_list = NULL;

static char *include_pattern = NULL;

static char *exclude_pattern = NULL;

static char *include_dir_pattern = NULL;

static char *exclude_dir_pattern = NULL;

static pcre *include_compiled = NULL;

static pcre *exclude_compiled = NULL;

static pcre *include_dir_compiled = NULL;

static pcre *exclude_dir_compiled = NULL;

static int after_context = 0;

static int before_context = 0;

static int both_context = 0;

static int dee_action = dee_READ;

static int DEE_action = DEE_READ;

static int error_count = 0;

static int filenames = FN_DEFAULT;

static int process_options = 0;

static BOOL count_only = FALSE;

static BOOL do_colour = FALSE;

static BOOL file_offsets = FALSE;

static BOOL hyphenpending = FALSE;

static BOOL invert = FALSE;

static BOOL line_offsets = FALSE;

static BOOL multiline = FALSE;

static BOOL number = FALSE;

static BOOL only_matching = FALSE;

static BOOL quiet = FALSE;

static BOOL silent = FALSE;

static BOOL utf8 = FALSE;

/* Structure for options and list of them */

enum { OP_NODATA, OP_STRING, OP_OP_STRING, OP_NUMBER, OP_OP_NUMBER,

       OP_PATLIST };

typedef struct option_item {

  int type;

  int one_char;

  void *dataptr;

  const char *long_name;

  const char *help_text;

} option_item;

/* Options without a single-letter equivalent get a negative value. This can be

used to identify them. */

#define N_COLOUR       (-1)

#define N_EXCLUDE      (-2)

#define N_EXCLUDE_DIR  (-3)

#define N_HELP         (-4)

#define N_INCLUDE      (-5)

#define N_INCLUDE_DIR  (-6)

#define N_LABEL        (-7)

#define N_LOCALE       (-8)

#define N_NULL         (-9)

#define N_LOFFSETS     (-10)

#define N_FOFFSETS     (-11)

static option_item optionlist[] = {

  { OP_NODATA,    N_NULL,   NULL,              "",              "  terminate options" },

  { OP_NODATA,    N_HELP,   NULL,              "help",          "display this help and exit" },

  { OP_NUMBER,    'A',      &after_context,    "after-context=number", "set number of following context lines" },

  { OP_NUMBER,    'B',      &before_context,   "before-context=number", "set number of prior context lines" },

  { OP_OP_STRING, N_COLOUR, &colour_option,    "color=option",  "matched text color option" },

  { OP_NUMBER,    'C',      &both_context,     "context=number", "set number of context lines, before & after" },

  { OP_NODATA,    'c',      NULL,              "count",         "print only a count of matching lines per FILE" },

  { OP_OP_STRING, N_COLOUR, &colour_option,    "colour=option", "matched text colour option" },

  { OP_STRING,    'D',      &DEE_option,       "devices=action","how to handle devices, FIFOs, and sockets" },

  { OP_STRING,    'd',      &dee_option,       "directories=action", "how to handle directories" },

  { OP_PATLIST,   'e',      NULL,              "regex(p)",      "specify pattern (may be used more than once)" },

  { OP_NODATA,    'F',      NULL,              "fixed_strings", "patterns are sets of newline-separated strings" },

  { OP_STRING,    'f',      &pattern_filename, "file=path",     "read patterns from file" },

  { OP_NODATA,    N_FOFFSETS, NULL,            "file-offsets",  "output file offsets, not text" },

  { OP_NODATA,    'H',      NULL,              "with-filename", "force the prefixing filename on output" },

  { OP_NODATA,    'h',      NULL,              "no-filename",   "suppress the prefixing filename on output" },

  { OP_NODATA,    'i',      NULL,              "ignore-case",   "ignore case distinctions" },

  { OP_NODATA,    'l',      NULL,              "files-with-matches", "print only FILE names containing matches" },

  { OP_NODATA,    'L',      NULL,              "files-without-match","print only FILE names not containing matches" },

  { OP_STRING,    N_LABEL,  &stdin_name,       "label=name",    "set name for standard input" },

  { OP_NODATA,    N_LOFFSETS, NULL,            "line-offsets",  "output line numbers and offsets, not text" },

  { OP_STRING,    N_LOCALE, &locale,           "locale=locale", "use the named locale" },

  { OP_NODATA,    'M',      NULL,              "multiline",     "run in multiline mode" },

  { OP_STRING,    'N',      &newline,          "newline=type",  "set newline type (CR, LF, CRLF, ANYCRLF or ANY)" },

  { OP_NODATA,    'n',      NULL,              "line-number",   "print line number with output lines" },

  { OP_NODATA,    'o',      NULL,              "only-matching", "show only the part of the line that matched" },

  { OP_NODATA,    'q',      NULL,              "quiet",         "suppress output, just set return code" },

  { OP_NODATA,    'r',      NULL,              "recursive",     "recursively scan sub-directories" },

  { OP_STRING,    N_EXCLUDE,&exclude_pattern,  "exclude=pattern","exclude matching files when recursing" },

  { OP_STRING,    N_INCLUDE,&include_pattern,  "include=pattern","include matching files when recursing" },

  { OP_STRING,    N_EXCLUDE_DIR,&exclude_dir_pattern, "exclude_dir=pattern","exclude matching directories when recursing" },

  { OP_STRING,    N_INCLUDE_DIR,&include_dir_pattern, "include_dir=pattern","include matching directories when recursing" },

#ifdef JFRIEDL_DEBUG

  { OP_OP_NUMBER, 'S',      &S_arg,            "jeffS",         "replace matched (sub)string with X" },

#endif

  { OP_NODATA,    's',      NULL,              "no-messages",   "suppress error messages" },

  { OP_NODATA,    'u',      NULL,              "utf-8",         "use UTF-8 mode" },

  { OP_NODATA,    'V',      NULL,              "version",       "print version information and exit" },

  { OP_NODATA,    'v',      NULL,              "invert-match",  "select non-matching lines" },

  { OP_NODATA,    'w',      NULL,              "word-regex(p)", "force patterns to match only as words"  },

  { OP_NODATA,    'x',      NULL,              "line-regex(p)", "force patterns to match only whole lines" },

  { OP_NODATA,    0,        NULL,               NULL,            NULL }

};

/* Tables for prefixing and suffixing patterns, according to the -w, -x, and -F

options. These set the 1, 2, and 4 bits in process_options, respectively. Note

that the combination of -w and -x has the same effect as -x on its own, so we

can treat them as the same. */

static const char *prefix[] = {

  "", "\\b", "^(?:", "^(?:", "\\Q", "\\b\\Q", "^(?:\\Q", "^(?:\\Q" };

static const char *suffix[] = {

  "", "\\b", ")$",   ")$",   "\\E", "\\E\\b", "\\E)$",   "\\E)$" };

/* UTF-8 tables - used only when the newline setting is "any". */

const int utf8_table3[] = { 0xff, 0x1f, 0x0f, 0x07, 0x03, 0x01};

const char utf8_table4[] = {

  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

  1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,

  2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,

  3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5 };

/*************************************************

*            OS-specific functions               *

*************************************************/

/* These functions are defined so that they can be made system specific,

although at present the only ones are for Unix, Win32, and for "no support". */

/************* Directory scanning in Unix ***********/

#if defined HAVE_SYS_STAT_H && defined HAVE_DIRENT_H && defined HAVE_SYS_TYPES_H

#include <sys/types.h>

#include <sys/stat.h>

#include <dirent.h>

typedef DIR directory_type;

static int

isdirectory(char *filename)

{

struct stat statbuf;

if (stat(filename, &statbuf) < 0)

  return 0;        /* In the expectation that opening as a file will fail */

return ((statbuf.st_mode & S_IFMT) == S_IFDIR)? '/' : 0;

}

static directory_type *

opendirectory(char *filename)

{

return opendir(filename);

}

static char *

readdirectory(directory_type *dir)

{

for (;;)

  {

  struct dirent *dent = readdir(dir);

  if (dent == NULL) return NULL;

  if (strcmp(dent->d_name, ".") != 0 && strcmp(dent->d_name, "..") != 0)

    return dent->d_name;

  }

/* Control never reaches here */

}

static void

closedirectory(directory_type *dir)

{

closedir(dir);

}

/************* Test for regular file in Unix **********/

static int

isregfile(char *filename)

{

struct stat statbuf;

if (stat(filename, &statbuf) < 0)

  return 1;        /* In the expectation that opening as a file will fail */

return (statbuf.st_mode & S_IFMT) == S_IFREG;

}

/************* Test stdout for being a terminal in Unix **********/

static BOOL

is_stdout_tty(void)

{

return isatty(fileno(stdout));

}

/************* Directory scanning in Win32 ***********/

/* I (Philip Hazel) have no means of testing this code. It was contributed by

Lionel Fourquaux. David Burgess added a patch to define INVALID_FILE_ATTRIBUTES

when it did not exist. David Byron added a patch that moved the #include of

<windows.h> to before the INVALID_FILE_ATTRIBUTES definition rather than after.

*/

#elif HAVE_WINDOWS_H

#ifndef STRICT

# define STRICT

#endif

#ifndef WIN32_LEAN_AND_MEAN

# define WIN32_LEAN_AND_MEAN

#endif

#include <windows.h>

#ifndef INVALID_FILE_ATTRIBUTES

#define INVALID_FILE_ATTRIBUTES 0xFFFFFFFF

#endif

typedef struct directory_type

{

HANDLE handle;

BOOL first;

WIN32_FIND_DATA data;

} directory_type;

int

isdirectory(char *filename)

{

DWORD attr = GetFileAttributes(filename);

if (attr == INVALID_FILE_ATTRIBUTES)

  return 0;

return ((attr & FILE_ATTRIBUTE_DIRECTORY) != 0) ? '/' : 0;

}

directory_type *

opendirectory(char *filename)

{

size_t len;

char *pattern;

directory_type *dir;

DWORD err;

len = strlen(filename);

pattern = (char *) malloc(len + 3);

dir = (directory_type *) malloc(sizeof(*dir));

if ((pattern == NULL) || (dir == NULL))

  {

  fprintf(stderr, "pcregrep: malloc failed\n");

  exit(2);

  }

memcpy(pattern, filename, len);

memcpy(&(pattern[len]), "\\*", 3);

dir->handle = FindFirstFile(pattern, &(dir->data));

if (dir->handle != INVALID_HANDLE_VALUE)

  {

  free(pattern);

  dir->first = TRUE;

  return dir;

  }

err = GetLastError();

free(pattern);

free(dir);

errno = (err == ERROR_ACCESS_DENIED) ? EACCES : ENOENT;

return NULL;

}

char *

readdirectory(directory_type *dir)

{

for (;;)

  {

  if (!dir->first)

    {

    if (!FindNextFile(dir->handle, &(dir->data)))

      return NULL;

    }

  else

    {

    dir->first = FALSE;

    }

  if (strcmp(dir->data.cFileName, ".") != 0 && strcmp(dir->data.cFileName, "..") != 0)

    return dir->data.cFileName;

  }

#ifndef _MSC_VER

return NULL;   /* Keep compiler happy; never executed */

#endif

}

void

closedirectory(directory_type *dir)

{

FindClose(dir->handle);

free(dir);

}

/************* Test for regular file in Win32 **********/

/* I don't know how to do this, or if it can be done; assume all paths are

regular if they are not directories. */

int isregfile(char *filename)

{

return !isdirectory(filename);

}

/************* Test stdout for being a terminal in Win32 **********/

/* I don't know how to do this; assume never */

static BOOL

is_stdout_tty(void)

{

return FALSE;

}

/************* Directory scanning when we can't do it ***********/

/* The type is void, and apart from isdirectory(), the functions do nothing. */

#else

typedef void directory_type;

int isdirectory(char *filename) { return 0; }

directory_type * opendirectory(char *filename) { return (directory_type*)0;}

char *readdirectory(directory_type *dir) { return (char*)0;}

void closedirectory(directory_type *dir) {}

/************* Test for regular when we can't do it **********/

/* Assume all files are regular. */

int isregfile(char *filename) { return 1; }

/************* Test stdout for being a terminal when we can't do it **********/

static BOOL

is_stdout_tty(void)

{

return FALSE;

}

#endif

#ifndef HAVE_STRERROR

/*************************************************

*     Provide strerror() for non-ANSI libraries  *

*************************************************/

/* Some old-fashioned systems still around (e.g. SunOS4) don't have strerror()

in their libraries, but can provide the same facility by this simple

alternative function. */

extern int   sys_nerr;

extern char *sys_errlist[];

char *

strerror(int n)

{

if (n < 0 || n >= sys_nerr) return "unknown error number";

return sys_errlist[n];

}

#endif /* HAVE_STRERROR */

/*************************************************

*             Find end of line                   *

*************************************************/

/* The length of the endline sequence that is found is set via lenptr. This may

be zero at the very end of the file if there is no line-ending sequence there.

Arguments:

  p         current position in line

  endptr    end of available data