add directory study
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gohigh
429
study/linux-travel/MINIX-1.5/1.5/Source/commands/paste.c
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429
study/linux-travel/MINIX-1.5/1.5/Source/commands/paste.c
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@@ -0,0 +1,429 @@
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/* 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 ...
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* paste -dLIST file1 file2 ...
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* paste -s [-dLIST] 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)
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* command of the same name, as of System V. It contains no proprietary
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* code, and therefore may be used without violation of any proprietary
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* agreements whatsoever. However, you will notice that the program is
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* copyrighted by me. This is to assure the program does *not* fall
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* into the public domain. Thus, I may specify just what I am now:
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* This program may be freely copied and distributed, provided this notice
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* remains; it may not be sold for profit without express written consent of
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* the author.
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* Please note that I recreated the behavior of the Unix(Tm) 'paste' command
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* as faithfully as possible, with minor exceptions (noted below); however,
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* I haven't run a full set of regression * tests. Thus, the user of
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* this program accepts full responsibility for any effects or loss;
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* in particular, the author is not responsible for any losses,
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* explicit or incidental, that may be 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
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* a user familiar with the Unix command of the same name. These changes
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* 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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* 'paste -s file1 file2 file3', it would list
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* <file1\n><file1\n><file2\n><file1\n><file2\n><file3\n>
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* I fixed this, and reported the bug to the providers of the command in
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* Unix.
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*
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* 2) The list of valid escape sequences has been expanded to include
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* \b,\f, and \r. (Just because *I* can't imagine why you'd want
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* to use them 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
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* by David O. Tinker (416) 978-3636 (utgpu!dtinker)
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* Sept. 19, 1987
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*/
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#include <errno.h>
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#include <ctype.h>
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#include <stdio.h>
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extern int errno;
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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 _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, ToUpper();
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short int dflag, sflag;
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char delims[] = {TAB};
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main(argc, argv)
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int argc;
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char **argv;
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{
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char *strcpy();
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dflag = sflag = 0;
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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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/* First, parse input options */
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while (argv[0][0] == '-' && argv[0][1] != '\0') {
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switch (ToUpper(argv[0][1])) {
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case 'D':
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/* Delimiter character(s) */
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strcpy(delims, &argv[0][2]);
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if (*delims == '\0')
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prerr(NODELIM, "");
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else
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delimbuild(delims);
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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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argc--;
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}
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} else
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prerr(USAGE, "");
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/* If no files specified, simply exit. Otherwise, if not the old
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* '-s' option, process all files. If '-s', then process files
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* one-at-a-time. */
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if (!sflag)
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docol(argc, argv); /* Column paste */
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else
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doserial(argc, argv); /* Serial paste */
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exit(0);
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}
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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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char delbuf[_MAXFILES + 2];
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FILE *fileptr[_MAXFILES + 1];
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FILE *fopen();
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char *fgets();
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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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for (filecnt = 0; (nfiles > 0) && (filecnt < _MAXFILES); filecnt++, nfiles--, fnamptr++) {
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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, "r");
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if (fileptr[filecnt] == NULL) prerr(BADFILE, *fnamptr);
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}
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}
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fileptr[filecnt] = ENDLIST; /* End of list. */
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if (nfiles) prerr(TOOMANY, "");
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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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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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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), fileptr[index]) != (char *) NULL) {
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strend = strlen(iobuff); /* Did the buffer 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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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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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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register int charnew, charold;
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register char *delimptr;
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register FILE *fileptr;
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FILE *fopen();
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for (; nfiles; nfiles--, fnamptr++) {
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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, stashing
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* them in charnew; output charold, converting to the
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* appropriate delimiter character if needful. After the
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* EOF, simply output 'charold' if it's a newline; otherwise,
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* output it and then a newline. */
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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) putc(*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((char) 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((char) charold, stdout);
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if ((char) charold != NL) putc(NL, stdout);
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fflush(stdout);
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}
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}
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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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register char *strout;
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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 (ToUpper(*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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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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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<delimiter>] 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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char ToUpper(c) /* This is non-standard, but it works */
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char c;
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{
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char x;
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if (isalpha(c)) {
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if (c > 'Z')
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x = (c - ' ');
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else
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x = c;
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} else {
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if (isdigit(c))
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x = c;
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else
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x = '\0'; /* this will terminate a string at
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* any character other than a letter
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* or numeral. */
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}
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return(x);
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}
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Reference in New Issue
Block a user