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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. */
-
- #include <config.h>
-
- #include <stdio.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include "system.h"
- #include "error.h"
-
- char *xmalloc ();
- char *xrealloc ();
-
- /* Indicates that no delimiter should be added in the current position. */
- #define EMPTY_DELIM '\0'
-
- static FILE dummy_closed;
- /* Element marking a file that has reached EOF and been closed. */
- #define CLOSED (&dummy_closed)
-
- static FILE dummy_endlist;
- /* Element marking end of list of open files. */
- #define ENDLIST (&dummy_endlist)
-
- /* 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 nonzero, display usage information and exit. */
- static int show_help;
-
- /* If nonzero, 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}
- };
-
- /* 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 (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 (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 (EXIT_FAILURE, 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 (EXIT_FAILURE, 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 (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 (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 (_("\
- Write lines consisting of the sequentially corresponding lines from\n\
- each FILE, separated by TABs, to standard output.\n\
- With no FILE, or when FILE is -, read standard input.\n\
- \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\
- "));
- }
- exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
- }
-
- int
- main (int argc, char **argv)
- {
- int optc, exit_status;
- char default_delims[2], zero_delims[3];
-
- program_name = argv[0];
- setlocale (LC_ALL, "");
- bindtextdomain (PACKAGE, LOCALEDIR);
- textdomain (PACKAGE);
-
- 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 ("paste - %s\n", PACKAGE_VERSION);
- exit (EXIT_SUCCESS);
- }
-
- 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 (EXIT_FAILURE, errno, "-");
- if (ferror (stdout) || fclose (stdout) == EOF)
- error (EXIT_FAILURE, errno, _("write error"));
- exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
- }
-