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The CICA Windows Explosion!
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fileutil.zip
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CUT.C
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1992-02-22
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/* cut - remove parts of lines of files
Copyright (C) 1984 by David M. Ihnat
This program is a total rewrite of the Bell Laboratories Unix(Tm)
command of the same name, as of System V. It contains no proprietary
code, and therefore may be used without violation of any proprietary
agreements whatsoever. However, you will notice that the program is
copyrighted by me. This is to assure the program does *not* fall
into the public domain. Thus, I may specify just what I am now:
This program may be freely copied and distributed, provided this notice
remains; it may not be sold for profit without express written consent of
the author.
Please note that I recreated the behavior of the Unix(Tm) 'cut' command
as faithfully as possible; however, I haven't run a full set of regression
tests. Thus, the user of this program accepts full responsibility for any
effects or loss; in particular, the author is not responsible for any losses,
explicit or incidental, that may be incurred through use of this program.
I ask that any bugs (and, if possible, fixes) be reported to me when
possible. -David Ihnat (312) 784-4544 ignatz@homebru.chi.il.us
POSIX changes, bug fixes, long-named options, and cleanup
by David MacKenzie <djm@ai.mit.edu>.
Usage: cut {-b byte-list,+bytes byte-list} [-n] [file...]
cut {-c character-list,+characters character-list} [file...]
cut {-f field-list,+fields field-list} [-d delim] [-s]
[+delimiter delim] [+only-delimited] [file...]
Options:
+bytes byte-list
-b byte-list Print only the bytes in positions listed
in BYTE-LIST.
Tabs and backspaces are treated like any
other character; they take up 1 byte.
+characters character-list
-c character-list Print only characters in positions listed
in CHARACTER-LIST.
The same as -b for now, but
internationalization will change that.
Tabs and backspaces are treated like any
other character; they take up 1 character.
+fields field-list
-f field-list Print only the fields listed in FIELD-LIST.
Fields are separated by a TAB by default.
+delimiter delim
-d delim For -f, fields are separated by the first
character in DELIM instead of TAB.
-n Do not split multibyte chars (no-op for now).
+only-delimited
-s For -f, do not print lines that do not contain
the field separator character.
The BYTE-LIST, CHARACTER-LIST, and FIELD-LIST are one or more numbers
or ranges separated by commas. The first byte, character, and field
are numbered 1.
A FILE of `-' means standard input. */
/* MS-DOS port (c) 1990 by Thorsten Ohl, ohl@gnu.ai.mit.edu
This port is also distributed under the terms of the
GNU General Public License as published by the
Free Software Foundation.
Please note that this file is not identical to the
original GNU release, you should have received this
code as patch to the official release. */
#ifdef MSDOS
static char RCS_Id[] =
"$Header: e:/gnu/fileutil/RCS/cut.c 1.4.0.3 90/09/19 11:17:49 tho Exp $";
static char Program_Id[] = "cut";
static char RCS_Revision[] = "$Revision: 1.4.0.3 $";
#define VERSION \
"GNU %s, Version %.*s (compiled %s %s for MS-DOS)\n", Program_Id, \
(sizeof RCS_Revision - 14), (RCS_Revision + 11), __DATE__, __TIME__
#define COPYING \
"This is free software, distributed under the terms of the\n" \
"GNU General Public License. For details, see the file COPYING.\n"
#endif /* MSDOS */
#include <stdio.h>
#include <errno.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#ifdef STDC_HEADERS
#include <stdlib.h>
#else
char *malloc ();
char *realloc ();
void exit ();
extern int errno;
#endif
#ifdef MSDOS
#include <gnulib.h>
void main (int argc, char **argv);
int set_fields (char *fieldstr);
void cut_file (FILE * stream);
void cut_file_bytes (FILE * fno);
void cut_file_fields (FILE * fno);
void enlarge_line (int new_size);
void invalid_list (void);
void usage (void);
#else /* not MSDOS */
char *xmalloc ();
char *xrealloc ();
int set_fields ();
void cut_file ();
void cut_file_bytes ();
void cut_file_fields ();
void enlarge_line ();
void error ();
void invalid_list ();
void usage ();
#endif /* not MSDOS */
/* The number of elements allocated for the input line
and the byte or field number.
Enlarged as necessary. */
int line_size;
/* Processed output buffer. */
char *outbuf;
/* Raw line buffer for field mode. */
char *inbuf;
/* What can be done about a byte or field. */
enum field_action
{
field_omit,
field_output
};
/* In byte mode, which bytes to output.
In field mode, which `delim'-separated fields to output.
Both bytes and fields are numbered starting with 1,
so the first element of `fields' is unused. */
enum field_action *fields;
enum operating_mode
{
undefined_mode,
/* Output characters that are in the given bytes. */
byte_mode,
/* Output the given delimeter-separated fields. */
field_mode
};
enum operating_mode operating_mode;
/* If nonzero,
for field mode, do not output lines containing no delimeter characters. */
int delimited_lines_only;
/* The delimeter character for field mode. */
unsigned char delim;
/* The name this program was run with. */
char *program_name;
struct option longopts[] =
{
#ifdef MSDOS
{"copying", 0, NULL, 30},
{"version", 0, NULL, 31},
#endif
{"bytes", 1, 0, 'b'},
{"characters", 1, 0, 'c'},
{"fields", 1, 0, 'f'},
{"delimiter", 0, 0, 'd'},
{"only-delimited", 0, 0, 's'},
{0, 0, 0, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
FILE *fileptr;
int optc;
int longind;
int exit_status = 0;
program_name = argv[0];
line_size = 512;
operating_mode = undefined_mode;
delimited_lines_only = 0;
delim = '\0';
fields = (enum field_action *)
xmalloc (line_size * sizeof (enum field_action));
outbuf = (char *) xmalloc (line_size);
inbuf = (char *) xmalloc (line_size);
for (optc = 0; optc < line_size; optc++)
fields[optc] = field_omit;
while ((optc = getopt_long (argc, argv, "b:c:d:f:ns", longopts, &longind))
!= EOF)
{
switch (optc)
{
case 'b':
case 'c':
/* Build the byte list. */
if (operating_mode != undefined_mode)
usage ();
operating_mode = byte_mode;
if (set_fields (optarg) == 0)
error (2, 0, "no fields given");
break;
case 'f':
/* Build the field list. */
if (operating_mode != undefined_mode)
usage ();
operating_mode = field_mode;
if (set_fields (optarg) == 0)
error (2, 0, "no fields given");
break;
case 'd':
/* New delimiter. */
if (optarg[0] == '\0')
error (2, 0, "no delimiter given");
if (optarg[1] != '\0')
error (2, 0, "delimiter must be a single character");
delim = optarg[0];
break;
case 'n':
break;
case 's':
delimited_lines_only++;
break;
#ifdef MSDOS
case 30:
fprintf (stderr, COPYING);
exit (0);
break;
case 31:
fprintf (stderr, VERSION);
exit (0);
break;
#endif
default:
usage ();
}
}
if (operating_mode == undefined_mode)
usage ();
if ((delimited_lines_only || delim != '\0') && operating_mode != field_mode)
usage ();
if (delim == '\0')
delim = '\t';
if (optind == argc)
cut_file (stdin);
else
for (; optind < argc; optind++)
{
if (!strcmp (argv[optind], "-"))
cut_file (stdin);
else
{
fileptr = fopen (argv[optind], "r");
if (fileptr == NULL)
{
error (0, errno, "%s", argv[optind]);
exit_status = 1;
}
else
{
cut_file (fileptr);
fclose (fileptr);
}
}
}
exit (exit_status);
}
/* Select for printing the positions in `fields' that are listed in
byte or field specification FIELDSTR. FIELDSTR should be
composed of one or more numbers or ranges of numbers, separated by
blanks or commas. Incomplete ranges may be given: `-m' means
`1-m'; `n-' means `n' through end of line or last field.
Return the number of fields selected. */
int
set_fields (fieldstr)
char *fieldstr;
{
int initial = 1; /* Value of first number in a range. */
int dash_found = 0; /* Nonzero if a '-' is found in this field. */
int value = 0; /* If nonzero, a number being accumulated. */
int fieldset = 0; /* Number of fields selected so far. */
/* If nonzero, index of first field in a range that goes to end of line. */
int eol_range_start = 0;
for (;;)
{
switch (*fieldstr)
{
case '-':
/* Starting a range. */
if (dash_found)
invalid_list ();
dash_found++;
fieldstr++;
if (value)
{
if (value >= line_size)
enlarge_line (value);
initial = value;
value = 0;
}
else
initial = 1;
break;
case ',':
case '\0':
/* Ending the string, or this field/byte sublist. */
if (dash_found)
{
dash_found = 0;
/* A range. Possibilites: -n, m-n, n-.
In any case, `initial' contains the start of the range. */
if (value == 0)
{
/* `n-'. From `initial' to end of line. */
eol_range_start = initial;
fieldset++;
}
else
{
/* `m-n' or `-n' (1-n). */
if (value < initial)
invalid_list ();
if (value >= line_size)
enlarge_line (value);
/* Is there already a range going to end of line? */
if (eol_range_start != 0)
{
/* Yes. Is the new sequence already contained
in the old one? If so, no processing is
necessary. */
if (initial < eol_range_start)
{
/* No, the new sequence starts before the
old. Does the old range going to end of line
extend into the new range? */
if (eol_range_start < value)
/* Yes. Simply move the end of line marker. */
eol_range_start = initial;
else
/* No. A simple range, before and disjoint from
the range going to end of line. Fill it. */
for (; initial <= value; initial++)
fields[initial] = field_output;
/* In any case, some fields were selected. */
fieldset++;
}
}
else
{
/* There is no range going to end of line. */
for (; initial <= value; initial++)
fields[initial] = field_output;
fieldset++;
}
value = 0;
}
}
else if (value != 0)
{
/* A simple field number, not a range. */
if (value >= line_size)
enlarge_line (value);
fields[value] = field_output;
value = 0;
fieldset++;
}
if (*fieldstr == '\0')
{
/* If there was a range going to end of line, fill the
array from the end of line point. */
if (eol_range_start)
for (initial = eol_range_start; initial < line_size; initial++)
fields[initial] = field_output;
return fieldset;
}
fieldstr++;
break;
default:
if (*fieldstr < '0' || *fieldstr > '9')
invalid_list ();
value = 10 * value + *fieldstr - '0';
fieldstr++;
break;
}
}
}
void
cut_file (stream)
FILE *stream;
{
if (operating_mode == byte_mode)
cut_file_bytes (stream);
else
cut_file_fields (stream);
}
/* Print the file open for reading on stream FNO
with the bytes specified in `fields' removed from each line. */
void
cut_file_bytes (fno)
FILE *fno;
{
register int c; /* Each character from the file. */
int doneflag = 0; /* Nonzero if EOF reached. */
int char_count; /* Number of chars in the line so far. */
char *outbufptr; /* Where to save next char to output. */
while (doneflag == 0)
{
/* Start processing a line. */
outbufptr = outbuf;
char_count = 0;
do
{
c = getc (fno);
if (c == EOF)
{
doneflag++;
break;
}
/* If this character is to be sent, stow it in the outbuffer. */
if (++char_count == line_size - 1)
enlarge_line (char_count);
if (fields[char_count] == field_output || c == '\n')
*outbufptr++ = c;
}
while (c != '\n');
if (char_count)
fwrite (outbuf, sizeof (char), outbufptr - outbuf, stdout);
}
}
/* Print the file open for reading on stream FNO
with the fields specified in `fields' removed from each line.
All characters are initially stowed in the raw input buffer, until
at least one field has been found. */
void
cut_file_fields (fno)
FILE *fno;
{
register int c; /* Each character from the file. */
int doneflag = 0; /* Nonzero if EOF reached. */
int char_count; /* Number of chars in line before any delim. */
int fieldfound; /* Nonzero if any fields to print found. */
int curr_field; /* Current index in `fields'. */
char *outbufptr; /* Where to save next char to output. */
char *inbufptr; /* Where to save next input char. */
while (doneflag == 0)
{
char_count = 0;
fieldfound = 0;
curr_field = 1;
outbufptr = outbuf;
inbufptr = inbuf;
do
{
c = getc (fno);
if (c == EOF)
{
doneflag++;
break;
}
if (fields[curr_field] == field_output && c != '\n')
{
/* Working on a field. It, and its terminating
delimiter, go only into the processed buffer. */
fieldfound = 1;
if (outbufptr - outbuf == line_size - 2)
enlarge_line (outbufptr - outbuf);
*outbufptr++ = c;
}
else if (fieldfound == 0)
{
if (++char_count == line_size - 1)
enlarge_line (char_count);
*inbufptr++ = c;
}
if (c == delim && ++curr_field == line_size - 1)
enlarge_line (curr_field);
}
while (c != '\n');
if (fieldfound)
{
/* Something was found. Print it. */
if (outbufptr[-1] == delim)
--outbufptr; /* Supress trailing delimiter. */
fwrite (outbuf, sizeof (char), outbufptr - outbuf, stdout);
if (c == '\n')
putc (c, stdout);
}
else if (!delimited_lines_only && char_count)
/* A line with some characters, no delimiters, and no
supression. Print it. */
fwrite (inbuf, sizeof (char), inbufptr - inbuf, stdout);
}
}
/* Extend the buffers to accomodate at least NEW_SIZE characters. */
void
enlarge_line (new_size)
int new_size;
{
int i;
new_size += 256; /* Leave some room to grow. */
fields = (enum field_action *)
xrealloc (fields, new_size * sizeof (enum field_action));
outbuf = (char *) xrealloc (outbuf, new_size);
inbuf = (char *) xrealloc (inbuf, new_size);
for (i = line_size; i < new_size; i++)
fields[i] = field_omit;
line_size = new_size;
}
#ifndef MSDOS /* We have it in gnulib */
/* Allocate N bytes of memory dynamically, with error checking. */
char *
xmalloc (n)
unsigned n;
{
char *p;
p = malloc (n);
if (p == 0)
error (2, 0, "virtual memory exhausted");
return p;
}
char *
xrealloc (p, n)
char *p;
unsigned n;
{
p = realloc (p, n);
if (p == 0)
error (2, 0, "virtual memory exhausted");
return p;
}
#endif /* not MSDOS */
void
invalid_list ()
{
error (2, 0, "invalid byte or field list");
}
void
usage ()
{
#ifdef MSDOS
fprintf (stderr, "\
Usage: %s {-b byte-list,+bytes byte-list} [-n] [+copying]\n\
[+version] [file...]\n\
%s {-c character-list,+characters character-list} [+copying]\n\
[+version] [file...]\n\
%s {-f field-list,+fields field-list} [-d delim] [-s]\n\
[+delimiter delim] [+only-delimited] [+copying] [+version] [file...]\n",
program_name, program_name, program_name);
#else /* not MSDOS */
fprintf (stderr, "\
Usage: %s {-b byte-list,+bytes byte-list} [-n] [file...]\n\
%s {-c character-list,+characters character-list} [file...]\n\
%s {-f field-list,+fields field-list} [-d delim] [-s]\n\
[+delimiter delim] [+only-delimited] [file...]\n",
program_name, program_name, program_name);
#endif /* not MSDOS */
exit (2);
}