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/* paste - merge 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) 'paste' command
as faithfully as possible, with minor exceptions; 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
The list of valid escape sequences has been expanded over the Unix
version, to include \b, \f, \r, and \v.
POSIX changes, bug fixes, long-named options, and cleanup
by David MacKenzie <djm@gnu.ai.mit.edu>.
Options:
--serial
-s Paste one file at a time rather than
one line from each file.
--delimiters=delim-list
-d delim-list Consecutively use the characters in
DELIM-LIST instead of tab to separate
merged lines. When DELIM-LIST is exhausted,
start again at its beginning.
A FILE of `-' means standard input.
If no FILEs are given, standard input is used. */
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "version.h"
void error ();
char *xmalloc ();
char *xrealloc ();
static char *collapse_escapes ();
static int paste_parallel ();
static int paste_serial ();
static void usage ();
/* Indicates that no delimiter should be added in the current position. */
#define EMPTY_DELIM '\0'
/* Element marking a file that has reached EOF and been closed. */
#define CLOSED ((FILE *) -1)
/* Element marking end of list of open files. */
#define ENDLIST ((FILE *) -2)
/* Name this program was run with. */
char *program_name;
/* If nonzero, we have read standard input at some point. */
static int have_read_stdin;
/* If nonzero, merge subsequent lines of each file rather than
corresponding lines from each file in parallel. */
static int serial_merge;
/* The delimeters between lines of input files (used cyclically). */
static char *delims;
/* A pointer to the character after the end of `delims'. */
static char *delim_end;
/* If non-zero, display usage information and exit. */
static int show_help;
/* If non-zero, print the version on standard output then exit. */
static int show_version;
static struct option const longopts[] =
{
{"serial", no_argument, 0, 's'},
{"delimiters", required_argument, 0, 'd'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{0, 0, 0, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
int optc, exit_status;
char default_delims[2], zero_delims[3];
program_name = argv[0];
have_read_stdin = 0;
serial_merge = 0;
delims = default_delims;
strcpy (delims, "\t");
strcpy (zero_delims, "\\0");
while ((optc = getopt_long (argc, argv, "d:s", longopts, (int *) 0))
!= EOF)
{
switch (optc)
{
case 0:
break;
case 'd':
/* Delimiter character(s). */
if (optarg[0] == '\0')
optarg = zero_delims;
delims = optarg;
break;
case 's':
serial_merge++;
break;
default:
usage (1);
}
}
if (show_version)
{
printf ("%s\n", version_string);
exit (0);
}
if (show_help)
usage (0);
if (optind == argc)
argv[argc++] = "-";
delim_end = collapse_escapes (delims);
if (!serial_merge)
exit_status = paste_parallel (argc - optind, &argv[optind]);
else
exit_status = paste_serial (argc - optind, &argv[optind]);
if (have_read_stdin && fclose (stdin) == EOF)
error (1, errno, "-");
if (ferror (stdout) || fclose (stdout) == EOF)
error (1, errno, "write error");
exit (exit_status);
}
/* Replace backslash representations of special characters in
STRPTR with their actual values.
The set of possible backslash characters has been expanded beyond
that recognized by the Unix version.
Return a pointer to the character after the new end of STRPTR. */
static char *
collapse_escapes (strptr)
char *strptr;
{
register char *strout;
strout = strptr; /* Start at the same place, anyway. */
while (*strptr)
{
if (*strptr != '\\') /* Is it an escape character? */
*strout++ = *strptr++; /* No, just transfer it. */
else
{
switch (*++strptr)
{
case '0':
*strout++ = EMPTY_DELIM;
break;
case 'b':
*strout++ = '\b';
break;
case 'f':
*strout++ = '\f';
break;
case 'n':
*strout++ = '\n';
break;
case 'r':
*strout++ = '\r';
break;
case 't':
*strout++ = '\t';
break;
case 'v':
*strout++ = '\v';
break;
default:
*strout++ = *strptr;
break;
}
strptr++;
}
}
return strout;
}
/* Perform column paste on the NFILES files named in FNAMPTR.
Return 0 if no errors, 1 if one or more files could not be
opened or read. */
static int
paste_parallel (nfiles, fnamptr)
int nfiles;
char **fnamptr;
{
int errors = 0; /* 1 if open or read errors occur. */
/* Number of files for which space is allocated in `delbuf' and `fileptr'.
Enlarged as necessary. */
int file_list_size = 12;
int chr; /* Input character. */
int line_length; /* Number of chars in line. */
int somedone; /* 0 if all files empty for this line. */
/* If all files are just ready to be closed, or will be on this
round, the string of delimiters must be preserved.
delbuf[0] through delbuf[file_list_size]
store the delimiters for closed files. */
char *delbuf;
int delims_saved; /* Number of delims saved in `delbuf'. */
register char *delimptr; /* Cycling pointer into `delims'. */
FILE **fileptr; /* Streams open to the files to process. */
int files_open; /* Number of files still open to process. */
int i; /* Loop index. */
int opened_stdin = 0; /* Nonzero if any fopen got fd 0. */
#ifdef lint /* Suppress `used before initialized' warning. */
chr = 0;
#endif
delbuf = (char *) xmalloc (file_list_size + 2);
fileptr = (FILE **) xmalloc ((file_list_size + 1) * sizeof (FILE *));
/* Attempt to open all files. This could be expanded to an infinite
number of files, but at the (considerable) expense of remembering
each file and its current offset, then opening/reading/closing. */
for (files_open = 0; files_open < nfiles; ++files_open)
{
if (files_open == file_list_size - 2)
{
file_list_size += 12;
delbuf = (char *) xrealloc (delbuf, file_list_size + 2);
fileptr = (FILE **) xrealloc (fileptr, (file_list_size + 1)
* sizeof (FILE *));
}
if (!strcmp (fnamptr[files_open], "-"))
{
have_read_stdin = 1;
fileptr[files_open] = stdin;
}
else
{
fileptr[files_open] = fopen (fnamptr[files_open], "r");
if (fileptr[files_open] == NULL)
error (1, errno, "%s", fnamptr[files_open]);
else if (fileno (fileptr[files_open]) == 0)
opened_stdin = 1;
}
}
fileptr[files_open] = ENDLIST;
if (opened_stdin && have_read_stdin)
error (1, 0, "standard input is closed");
/* Read a line from each file and output it to stdout separated by a
delimiter, until we go through the loop without successfully
reading from any of the files. */
while (files_open)
{
/* Set up for the next line. */
somedone = 0;
delimptr = delims;
delims_saved = 0;
for (i = 0; fileptr[i] != ENDLIST && files_open; i++)
{
line_length = 0; /* Clear so we can easily detect EOF. */
if (fileptr[i] != CLOSED)
{
chr = getc (fileptr[i]);
if (chr != EOF && delims_saved)
{
fwrite (delbuf, sizeof (char), delims_saved, stdout);
delims_saved = 0;
}
while (chr != EOF)
{
line_length++;
if (chr == '\n')
break;
putc (chr, stdout);
chr = getc (fileptr[i]);
}
}
if (line_length == 0)
{
/* EOF, read error, or closed file.
If an EOF or error, close the file and mark it in the list. */
if (fileptr[i] != CLOSED)
{
if (ferror (fileptr[i]))
{
error (0, errno, "%s", fnamptr[i]);
errors = 1;
}
if (fileptr[i] == stdin)
clearerr (fileptr[i]); /* Also clear EOF. */
else if (fclose (fileptr[i]) == EOF)
{
error (0, errno, "%s", fnamptr[i]);
errors = 1;
}
fileptr[i] = CLOSED;
files_open--;
}
if (fileptr[i + 1] == ENDLIST)
{
/* End of this output line.
Is this the end of the whole thing? */
if (somedone)
{
/* No. Some files were not closed for this line. */
if (delims_saved)
{
fwrite (delbuf, sizeof (char), delims_saved, stdout);
delims_saved = 0;
}
putc ('\n', stdout);
}
continue; /* Next read of files, or exit. */
}
else
{
/* Closed file; add delimiter to `delbuf'. */
if (*delimptr != EMPTY_DELIM)
delbuf[delims_saved++] = *delimptr;
if (++delimptr == delim_end)
delimptr = delims;
}
}
else
{
/* Some data read. */
somedone++;
/* Except for last file, replace last newline with delim. */
if (fileptr[i + 1] != ENDLIST)
{
if (chr != '\n')
putc (chr, stdout);
if (*delimptr != EMPTY_DELIM)
putc (*delimptr, stdout);
if (++delimptr == delim_end)
delimptr = delims;
}
else
putc (chr, stdout);
}
}
}
return errors;
}
/* Perform serial paste on the NFILES files named in FNAMPTR.
Return 0 if no errors, 1 if one or more files could not be
opened or read. */
static int
paste_serial (nfiles, fnamptr)
int nfiles;
char **fnamptr;
{
int errors = 0; /* 1 if open or read errors occur. */
register int charnew, charold; /* Current and previous char read. */
register char *delimptr; /* Current delimiter char. */
register FILE *fileptr; /* Open for reading current file. */
for (; nfiles; nfiles--, fnamptr++)
{
if (!strcmp (*fnamptr, "-"))
{
have_read_stdin = 1;
fileptr = stdin;
}
else
{
fileptr = fopen (*fnamptr, "r");
if (fileptr == NULL)
{
error (0, errno, "%s", *fnamptr);
errors = 1;
continue;
}
}
delimptr = delims; /* Set up for delimiter string. */
charold = getc (fileptr);
if (charold != EOF)
{
/* `charold' is set up. Hit it!
Keep reading characters, stashing them in `charnew';
output `charold', converting to the appropriate delimiter
character if needed. After the EOF, output `charold'
if it's a newline; otherwise, output it and then a newline. */
while ((charnew = getc (fileptr)) != EOF)
{
/* Process the old character. */
if (charold == '\n')
{
if (*delimptr != EMPTY_DELIM)
putc (*delimptr, stdout);
if (++delimptr == delim_end)
delimptr = delims;
}
else
putc (charold, stdout);
charold = charnew;
}
/* Hit EOF. Process that last character. */
putc (charold, stdout);
}
if (charold != '\n')
putc ('\n', stdout);
if (ferror (fileptr))
{
error (0, errno, "%s", *fnamptr);
errors = 1;
}
if (fileptr == stdin)
clearerr (fileptr); /* Also clear EOF. */
else if (fclose (fileptr) == EOF)
{
error (0, errno, "%s", *fnamptr);
errors = 1;
}
}
return errors;
}
static void
usage (status)
int status;
{
if (status != 0)
fprintf (stderr, "Try `%s --help' for more information.\n",
program_name);
else
{
printf ("\
Usage: %s [OPTION]... [FILE]...\n\
",
program_name);
printf ("\
\n\
-d, --delimiters=LIST reuse characters from LIST instead of TABs\n\
-s, --serial paste one file at a time instead of in parallel\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
With no INPUT, or when INPUT is -, read standard input.\n\
");
}
exit (status);
}
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