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Atari Mega Archive 1
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grep.c
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1989-03-02
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/* grep - print lines matching an extended regular expression
Copyright (C) 1988 Free Software Foundation, Inc.
Written June, 1988 by Mike Haertel
BMG speedups added July, 1988
by James A. Woods and Arthur David Olson
NO WARRANTY
BECAUSE THIS PROGRAM IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT
WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC,
RICHARD M. STALLMAN AND/OR OTHER PARTIES PROVIDE THIS PROGRAM "AS IS"
WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY
AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., AND/OR ANY OTHER PARTY
WHO MAY MODIFY AND REDISTRIBUTE THIS PROGRAM AS PERMITTED BELOW, BE
LIABLE TO YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR
OTHER SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR
DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR
A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) THIS
PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.
GENERAL PUBLIC LICENSE TO COPY
1. You may copy and distribute verbatim copies of this source file
as you receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy a valid copyright notice "Copyright
(C) 1988 Free Software Foundation, Inc."; and include following the
copyright notice a verbatim copy of the above disclaimer of warranty
and of this License. You may charge a distribution fee for the
physical act of transferring a copy.
2. You may modify your copy or copies of this source file or
any portion of it, and copy and distribute such modifications under
the terms of Paragraph 1 above, provided that you also do the following:
a) cause the modified files to carry prominent notices stating
that you changed the files and the date of any change; and
b) cause the whole of any work that you distribute or publish,
that in whole or in part contains or is a derivative of this
program or any part thereof, to be licensed at no charge to all
third parties on terms identical to those contained in this
License Agreement (except that you may choose to grant more extensive
warranty protection to some or all third parties, at your option).
c) You may charge a distribution fee for the physical act of
transferring a copy, and you may at your option offer warranty
protection in exchange for a fee.
Mere aggregation of another unrelated program with this program (or its
derivative) on a volume of a storage or distribution medium does not bring
the other program under the scope of these terms.
3. You may copy and distribute this program or any portion of it in
compiled, executable or object code form under the terms of Paragraphs
1 and 2 above provided that you do the following:
a) accompany it with the complete corresponding machine-readable
source code, which must be distributed under the terms of
Paragraphs 1 and 2 above; or,
b) accompany it with a written offer, valid for at least three
years, to give any third party free (except for a nominal
shipping charge) a complete machine-readable copy of the
corresponding source code, to be distributed under the terms of
Paragraphs 1 and 2 above; or,
c) accompany it with the information you received as to where the
corresponding source code may be obtained. (This alternative is
allowed only for noncommercial distribution and only if you
received the program in object code or executable form alone.)
For an executable file, complete source code means all the source code for
all modules it contains; but, as a special exception, it need not include
source code for modules which are standard libraries that accompany the
operating system on which the executable file runs.
4. You may not copy, sublicense, distribute or transfer this program
except as expressly provided under this License Agreement. Any attempt
otherwise to copy, sublicense, distribute or transfer this program is void and
your rights to use the program under this License agreement shall be
automatically terminated. However, parties who have received computer
software programs from you with this License Agreement will not have
their licenses terminated so long as such parties remain in full compliance.
5. If you wish to incorporate parts of this program into other free
programs whose distribution conditions are different, write to the Free
Software Foundation at 675 Mass Ave, Cambridge, MA 02139. We have not yet
worked out a simple rule that can be stated here, but we will often permit
this. We will be guided by the two goals of preserving the free status of
all derivatives our free software and of promoting the sharing and reuse of
software.
In other words, you are welcome to use, share and improve this program.
You are forbidden to forbid anyone else to use, share and improve
what you give them. Help stamp out software-hoarding! */
#include <ctype.h>
#include <stdio.h>
#ifdef USG
#include <memory.h>
#include <string.h>
#else
#include <strings.h>
#endif
#include "dfa.h"
#include "regex.h"
#ifdef __STDC__
extern getopt(int, char **, const char *);
extern read(int, void *, int);
extern open(const char *, int, ...);
extern void close();
#else
extern char *strrchr();
#endif
extern char *optarg;
extern optind, opterr;
extern errno;
extern char *sys_errlist[];
#define MAX(a, b) ((a) > (b) ? (a) : (b))
/* Exit status codes. */
#define MATCHES_FOUND 0 /* Exit 0 if no errors and matches found. */
#define NO_MATCHES_FOUND 1 /* Exit 1 if no matches were found. */
#define ERROR 2 /* Exit 2 if some error occurred. */
/* Error is set true if something awful happened. */
static int error;
/* The program name for error messages. */
static char *prog;
/* We do all our own buffering by hand for efficiency. */
static char *buffer; /* The buffer itself, grown as needed. */
static bufbytes; /* Number of bytes in the buffer. */
static size_t bufalloc; /* Number of bytes allocated to the buffer. */
static bufprev; /* Number of bytes that have been forgotten.
This is used to get byte offsets from the
beginning of the file. */
static bufread; /* Number of bytes to get with each read(). */
static void
initialize_buffer()
{
bufread = 8192;
bufalloc = bufread + bufread / 2;
buffer = malloc(bufalloc);
if (! buffer)
{
fprintf(stderr, "%s: Memory exhausted (%s)\n", prog,
sys_errlist[errno]);
exit(ERROR);
}
}
/* The current input file. */
static fd;
static char *filename;
static eof;
/* Fill the buffer retaining the last n bytes at the beginning of the
newly filled buffer (for backward context). Returns the number of new
bytes read from disk. */
static
fill_buffer_retaining(n)
int n;
{
char *p, *q;
int i;
/* See if we need to grow the buffer. */
if (bufalloc - n <= bufread)
{
while (bufalloc - n <= bufread)
{
bufalloc *= 2;
bufread *= 2;
}
buffer = realloc(buffer, bufalloc);
if (! buffer)
{
fprintf(stderr, "%s: Memory exhausted (%s)\n", prog,
sys_errlist[errno]);
exit(ERROR);
}
}
bufprev += bufbytes - n;
/* Shift stuff down. */
for (i = n, p = buffer, q = p + bufbytes - n; i--; )
*p++ = *q++;
bufbytes = n;
if (eof)
return 0;
/* Read in new stuff. */
i = read(fd, buffer + bufbytes, bufread);
if (i < 0)
{
fprintf(stderr, "%s: read on %s failed (%s)\n", prog,
filename ? filename : "<stdin>", sys_errlist[errno]);
error = 1;
}
/* Kludge to pretend every nonempty file ends with a n