456 lines
12 KiB
C
456 lines
12 KiB
C
/* paste - laminate files Author: David Ihnat */
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/* Paste - a recreation of the Unix(Tm) paste(1) command.
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*
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* syntax: paste file1 file2 ... paste -dLIST file1 file2 ... paste -s [-dLIST]
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* file1 file2 ...
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*
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* Copyright (C) 1984 by David M. Ihnat
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*
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* This program is a total rewrite of the Bell Laboratories Unix(Tm) command of
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* the same name, as of System V. It contains no proprietary code, and
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* therefore may be used without violation of any proprietary agreements
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* whatsoever. However, you will notice that the program is copyrighted by
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* me. This is to assure the program does *not* fall into the public domain.
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* Thus, I may specify just what I am now: This program may be freely copied
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* and distributed, provided this notice remains; it may not be sold for
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* profit without express written consent of the author. Please note that I
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* recreated the behavior of the Unix(Tm) 'paste' command as faithfully as
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* possible, with minor exceptions (noted below); however, I haven't run a
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* full set of regression * tests. Thus, the user of this program accepts
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* full responsibility for any effects or loss; in particular, the author is
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* not responsible for any losses, explicit or incidental, that may be
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* incurred through use of this program.
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*
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* The changes to the program, with one exception, are transparent to a user
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* familiar with the Unix command of the same name. These changes are:
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*
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* 1) The '-s' option had a bug in the Unix version when used with multiple
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* files. (It would repeat each file in a list, i.e., for
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*
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* paste -s file1 file2 file3
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*
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* it would list
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*
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* <file1\n><file1\n><file2\n><file1\n><file2\n><file3\n>
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*
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* I fixed this, and reported the bug to the providers of the command in Unix.
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*
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* 2) The list of valid escape sequences has been expanded to include \b,\f,
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* and \r. (Just because *I* can't imagine why you'd want to use them
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* doesn't mean I should keep them from you.)
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*
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* 3) There is no longer any restriction on line length.
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*
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* I ask that any bugs (and, if possible, fixes) be reported to me when
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* possible. -David Ihnat (312) 784-4544 ihuxx!ignatz
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*/
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/* Modified to run under MINIX 1.1 by David O. Tinker (416) 978-3636
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* (utgpu!dtinker) Sept. 19, 1987
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*/
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/* Modified to conform to POSIX 1003.2/Draft10 standard 23rd Sept. 1990
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* Changes:
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* - the arguments can be in any order
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* - removed the ToUpper function
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* by Thomas Brupbacher (tobr@mw.lpc.ethz.ch)
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*/
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#include <errno.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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/* I'd love to use enums, but not everyone has them. Portability, y'know. */
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#define NODELIM 1
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#define USAGE 2
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#define BADFILE 3
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#define TOOMANY 4
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#define TAB '\t'
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#define NL '\n'
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#define BS '\b'
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#define FF '\f'
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#define CR '\r'
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#define DEL '\177'
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#define SPACE ' '
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#define BACKSLASH '\\'
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#define _MAXSZ 512
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#define _MAXFILES 12
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#define CLOSED ((FILE *)-1)
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#define ENDLIST ((FILE *)-2)
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char *cmdnam;
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short int sflag;
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static char default_delims[] = {TAB}; /* default delimiter string */
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char *delims; /* the pointer to the delimiters */
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int number_of_delims = 1; /* number of delimiters to use */
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int main(int argc, char **argv);
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void docol(int nfiles, char **fnamptr);
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void doserial(int nfiles, char **fnamptr);
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void delimbuild(char *strptr);
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void prerr(int etype, char *estring);
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int main(argc, argv)
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int argc;
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char **argv;
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{
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char **arg_ptr; /* used to save argv, needed for docol() etc */
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int num_files = 0; /* Number of filenames specified on cmd line */
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sflag = 0;
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delims = default_delims; /* use default delimiters */
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cmdnam = *argv;
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if (argc >= 2) {
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/* Skip invocation name */
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argv++;
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argc--;
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/* Save argv */
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arg_ptr = argv;
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/* First, parse input options */
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while (argc-- > 0) {
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if (argv[0][0] == '-' && argv[0][1] != '\0') {
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switch (argv[0][1]) {
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case 'd':
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/* Delimiter character(s) */
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if (*(++argv) == '\0')
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prerr(NODELIM, "");
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else
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delimbuild(*(argv));
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argc--;
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break;
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case 's': sflag++; break;
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default: prerr(USAGE, "");
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}
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argv++;
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} else {
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num_files++;
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argv++;
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}
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}
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/* If there are more than MAX_FILES files on the command
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* line, exit with error message. */
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if (num_files > _MAXFILES) prerr(TOOMANY, "");
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/* If no files specified, simply exit. Otherwise, if not the
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* old '-s' option, process all files. If '-s', then process
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* files one-at-a-time. */
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if (!sflag)
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docol(num_files, arg_ptr); /* Column paste */
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else
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doserial(num_files, arg_ptr); /* Serial paste */
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exit(0);
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} else
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prerr(USAGE, "");
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return(0);
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}
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void docol(nfiles, fnamptr)
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int nfiles;
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char **fnamptr;
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{
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char iobuff[_MAXSZ]; /* i/o buffer for the fgets */
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short int somedone; /* flag for blank field handling */
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/* There is a strange case where all files are just ready to be
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* closed, or will on this round. In that case, the string of
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* delimiters must be preserved. delbuf[1] ->delbuf[MAXFILES+1]
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* provides intermediate storage for closed files, if needed;
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* delbuf[0] is the current index.
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*/
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char delbuf[_MAXFILES + 2];
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FILE *fileptr[_MAXFILES + 1];
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int filecnt; /* Set to number of files to process */
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register char *delimptr; /* Cycling delimiter pointer */
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int index; /* Working variable */
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int strend; /* End of string in buffer */
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/* Perform column paste. First, attempt to open all files. (This
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* could be expanded to an infinite number of files, but at the
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* (considerable) expense of remembering the file and its current
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* offset, then opening/reading/closing. The commands' utility
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* doesn't warrant the effort; at least, to me...)
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*/
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for (filecnt = 0; (nfiles > 0); fnamptr++) {
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if ((fnamptr[0][0] == '-') && (fnamptr[0][1] != '\0')) {
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if (fnamptr[0][1] == 'd') fnamptr++;
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} else {
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nfiles--;
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if (fnamptr[0][0] == '-') {
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fileptr[filecnt++] = stdin;
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} else {
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fileptr[filecnt] = fopen(fnamptr[0], "r");
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if (fileptr[filecnt++] == NULL)
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prerr(BADFILE, *fnamptr);
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}
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}
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}
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fileptr[filecnt] = ENDLIST; /* End of list. */
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/* Have all files. Now, read a line from each file, and output to
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* stdout. Notice that the old 511 character limitation on the line
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* length no longer applies, since this program doesn't do the
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* buffering. Do this until you go through the loop and don't
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* successfully read from any of the files.
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*/
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for (; filecnt;) {
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somedone = 0; /* Blank field handling flag */
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delimptr = delims; /* Start at beginning of delim list */
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delbuf[0] = 0; /* No squirreled delims */
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for (index = 0; (fileptr[index] != ENDLIST) && filecnt; index++) {
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/* Read a line and immediately output. If it's too
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* big for the buffer, then dump what was read and go
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* back for more.
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*
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* Otherwise, if it is from the last file, then leave
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* the carriage return in place; if not, replace with
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* a delimiter (if any)
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*/
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strend = 0; /* Set so can easily detect EOF */
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if (fileptr[index] != CLOSED)
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while (fgets(iobuff, (_MAXSZ - 1),
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fileptr[index]) != NULL) {
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strend = strlen(iobuff);/* Did the buf fill? */
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if (strend == (_MAXSZ - 1)) {
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/* Gosh, what a long line. */
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fputs(iobuff, stdout);
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strend = 0;
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continue;
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}
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/* Ok got whole line in buffer. */
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break; /* Out of loop for this file */
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}
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/* Ended either on an EOF (well, actually NULL
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* return-- it *could* be some sort of file error,
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* but but if the file was opened successfully, this
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* is unlikely. Besides, error checking on streams
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* doesn't allow us to decide exactly what went
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* wrong, so I'm going to be very Unix-like and
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* ignore it!), or a closed file, or a received line.
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* If an EOF, close the file and mark it in the list.
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* In any case, output the delimiter of choice.
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*/
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if (!strend) {
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if (fileptr[index] != CLOSED) {
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fclose(fileptr[index]);
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fileptr[index] = CLOSED;
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filecnt--;
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}
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/* Is this the end of the whole thing? */
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if ((fileptr[index + 1] == ENDLIST) && !somedone)
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continue; /* EXITS */
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/* Ok, some files not closed this line. Last file? */
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if (fileptr[index + 1] == ENDLIST) {
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if (delbuf[0]) {
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fputs(&delbuf[1], stdout);
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delbuf[0] = 0;
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}
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putc((int) NL, stdout);
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continue; /* Next read of files */
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} else {
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/* Closed file; setup delim */
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if (*delimptr != DEL) {
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delbuf[0]++;
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delbuf[delbuf[0]] = *delimptr++;
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delbuf[delbuf[0] + 1] = '\0';
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} else
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delimptr++;
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}
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/* Reset end of delimiter string if necessary */
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if (*delimptr == '\0') delimptr = delims;
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} else {
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/* Some data read. */
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somedone++;
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/* Any saved delims? */
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if (delbuf[0]) {
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fputs(&delbuf[1], stdout);
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delbuf[0] = 0;
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}
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/* If last file, last char will be NL. */
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if (fileptr[index + 1] != ENDLIST) {
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if (*delimptr == DEL) {
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delimptr++;
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iobuff[strend - 1] = '\0';/* No delim*/
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} else
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iobuff[strend - 1] = *delimptr++;
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}
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if (*delimptr == '\0') delimptr = delims;
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/* Now dump the buffer */
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fputs(iobuff, stdout);
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fflush(stdout);
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}
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}
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}
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}
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void doserial(nfiles, fnamptr)
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int nfiles;
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char **fnamptr;
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{
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/* Do serial paste. Simply scarf characters, performing
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* one-character buffering to facilitate delim processing.
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*/
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register int charnew, charold;
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register char *delimptr;
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register FILE *fileptr;
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for (; nfiles != 0; fnamptr++) {
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if ((fnamptr[0][0] == '-') && (fnamptr[0][1] != '\0')) {
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if (fnamptr[0][1] == 'd') fnamptr++;
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} else {
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if (fnamptr[0][0] == '-') {
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fileptr = stdin;
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} else {
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fileptr = fopen(*fnamptr, "r");
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if (fileptr == NULL) prerr(BADFILE, *fnamptr);
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}
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/* The file is open; just keep taking characters,
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* stashing them in charnew; output charold,
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* converting to the appropriate delimiter character
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* if needful. After the EOF, simply output
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* 'charold' if it's a newline; otherwise, output it
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* and then a newline.
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*/
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delimptr = delims; /* Set up for delimiter string */
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if ((charold = getc(fileptr)) == EOF) {
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/* Empty file! */
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putc(NL, stdout);
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fflush(stdout);
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continue; /* Go on to the next file */
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}
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/* Ok, 'charold' is set up. Hit it! */
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while ((charnew = getc(fileptr)) != EOF) {
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/* Ok, process the old character */
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if (charold == NL) {
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if (*delimptr != DEL)
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putc((int) *delimptr++, stdout);
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/* Reset pointer at end of delimiter string */
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if (*delimptr == '\0') delimptr = delims;
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} else
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putc(charold, stdout);
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charold = charnew;
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}
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/* Ok, hit EOF. Process that last character */
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putc(charold, stdout);
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if ((char) charold != NL) putc(NL, stdout);
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fflush(stdout);
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nfiles--;
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}
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}
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}
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void delimbuild(strptr)
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char *strptr;
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{
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/* Process the delimiter string into something that can be used by
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* the routines. This involves, primarily, collapsing the backslash
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* representations of special characters into their actual values,
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* and terminating the string in a manner that the routines can
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* recognize. The set of possible backslash characters has been
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* expanded beyond that recognized by the vanilla Unix(Tm) version.
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*/
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register char *strout;
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delims = strptr; /* delims now points to argv[...] */
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strout = strptr; /* Start at the same place, anyway */
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while (*strptr) {
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if (*strptr != '\\') /* Is it an escape character? */
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*strout++ = *strptr++; /* No, just transfer it */
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else {
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strptr++; /* Get past escape character */
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switch (*strptr) {
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case '0': *strout++ = DEL; break;
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case 't': *strout++ = TAB; break;
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case 'n': *strout++ = NL; break;
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case 'b': *strout++ = BS; break;
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case 'f': *strout++ = FF; break;
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case 'r': *strout++ = CR; break;
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case '\\':
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*strout++ = BACKSLASH;
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break;
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default: *strout++ = *strptr;
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}
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strptr++;
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}
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}
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*strout = '\0'; /* Heaven forfend that we forget this! */
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}
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void prerr(etype, estring)
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int etype;
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char *estring;
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{
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switch (etype) {
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case USAGE:
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fprintf(stderr, "%s : Usage: %s [-s] [-d <delimiters>] file1 file2 ...\n", cmdnam, cmdnam);
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break;
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case NODELIM:
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fprintf(stderr, "%s : no delimiters\n", cmdnam);
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break;
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case BADFILE:
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fprintf(stderr, "%s : %s : cannot open\n", cmdnam, estring);
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break;
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case TOOMANY:
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fprintf(stderr, "%s : too many files\n", cmdnam);
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break;
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}
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exit(1);
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}
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