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0335.ZIP
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PASTE.C
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1985-05-08
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/*
* paste - a recreation of the Unix(Tm) paste(1) command.
*
* syntax: paste file1 file2 ...
* paste -dLIST file1 file2 ...
* paste -s [-dLIST] file1 file2 ...
*
* 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 (noted below); 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.
*
* The changes to the program, with one exception, are transparent to
* a user familiar with the Unix command of the same name. These changes
* are:
*
* 1) The '-s' option had a bug in the Unix version when used with multiple
* files. (It would repeat each file in a list, i.e., for
* 'paste -s file1 file2 file3', it would list
* <file1\n><file1\n><file2\n><file1\n><file2\n><file3\n>
* I fixed this, and reported the bug to the providers of the command in
* Unix.
*
* 2) The list of valid escape sequences has been expanded to include
* \b,\f,\r, and \v. (Just because *I* can't imagine why you'd want
* to use them doesn't mean I should keep them from you.)
*
* 3) There is no longer any restriction on line length.
*
* I ask that any bugs (and, if possible, fixes) be reported to me when
* possible. -David Ihnat (312) 784-4544 ihuxx!ignatz
*/
#include <stdio.h>
extern int errno;
#define CPM
/* I'd love to use enums, but not everyone has them. Portability, y'know. */
#define NODELIM 1
#define USAGE 2
#define BADFILE 3
#define TOOMANY 4
#define TAB '\t'
#define NL '\n'
#define BS '\b'
#define FF '\f'
#define CR '\r'
#define VT '\v'
#define DEL '\177'
#define _MAXSZ 512
#define _MAXFILES 12
#define CLOSED ((FILE *)-1)
#define ENDLIST ((FILE *)-2)
#define COMMAND "paste"
char *cmdnam;
short int dflag,sflag;
char delims[] = { TAB };
main(argc,argv)
int argc;
char **argv;
{
char *strcpy();
dflag = sflag = 0;
#ifdef CPM
cmdnam = COMMAND;
#else
cmdnam = *argv;
#endif
/* Skip invocation name */
argv++;
argc--;
/* First, parse input options */
while(argv[0][0] == '-' && argv[0][1] != '\0')
{
switch(argv[0][1])
{
case 'd':
case 'D':
/* Delimiter character(s) */
strcpy(delims,&argv[0][2]);
if(*delims == '\0')
prerr(NODELIM,"");
else
delimbuild(delims);
break;
case 's':
case 'S':
sflag++;
break;
default:
prerr(USAGE,"");
}
argv++;
argc--;
}
/*
* If no files specified, simply exit. Otherwise,
* if not the old '-s' option, process all files.
* If '-s', then process files one-at-a-time.
*/
if(!sflag)
docol(argc,argv); /* Column paste */
else
doserial(argc,argv); /* Serial paste */
}
docol(nfiles,fnamptr)
int nfiles;
char **fnamptr;
{
char iobuff[_MAXSZ]; /* i/o buffer for the fgets */
short int somedone; /* flag for blank field handling */
/*
* There is a strange case where all files are just ready to
* be closed, or will on this round. In that case, the string
* of delimiters must be preserved. delbuf[1] ->delbuf[MAXFILES+1]
* provides intermediate storage for closed files, if needed;
* delbuf[0] is the current index.
*/
char delbuf[_MAXFILES+2];
FILE *fileptr[_MAXFILES+1];
FILE *fopen();
char *fgets();
int filecnt; /* Set to number of files to process */
register char *delimptr; /* Cycling delimiter pointer */
int index; /* Working variable */
int strend; /* End of string in buffer */
/*
* Perform column paste. First, attempt to open all
* files. (This could be expanded to an infinite number of files,
* but at the (considerable) expense of remembering the file and
* its current offset, then opening/reading/closing. The
* commands' utility doesn't warrant the effort; at least, to me...)
*/
for(filecnt=0;(nfiles>0) && (filecnt<_MAXFILES);filecnt++,nfiles--,fnamptr++)
{
if(fnamptr[0][0] == '-')
fileptr[filecnt] = stdin;
else
{
fileptr[filecnt] = fopen(*fnamptr,"r");
if(fileptr[filecnt] == NULL)
prerr(BADFILE,*fnamptr);
}
}
fileptr[filecnt] = ENDLIST; /* End of list. */
if(nfiles)
prerr(TOOMANY,"");
/*
* Have all files. Now, read a line from each file, and output
* to stdout. Notice that the old 511 character limitation on
* the line length no longer applies, since this program doesn't
* do the buffering. Do this until you go through the loop and
* don't successfully read from any of the files.
*/
for(;filecnt;)
{
somedone = 0; /* Blank field handling flag */
delimptr = delims; /* Start at beginning of delim list */
delbuf[0] = 0; /* No squirreled delims */
for(index = 0;(fileptr[index] != ENDLIST) && filecnt; index++)
{
/* Read a line and immediately output.
* If it's too big for the buffer, then dump what was
* read and go back for more.
*
* Otherwise, if it is from the last file, then leave
* the carriage return in place; if not, replace with
* a delimiter (if any)
*/
strend = 0; /* Set so can easily detect EOF */
if(fileptr[index] != CLOSED)
while(fgets(iobuff,(_MAXSZ-1),fileptr[index]) != (char *)NULL)
{
strend = strlen(iobuff); /* Did the buffer fill? */
if(strend == (_MAXSZ-1))
{
/* Gosh, what a long line. */
fputs(iobuff,stdout);
strend = 0;
continue;
}
/* Ok got whole line in buffer. */
break; /* Out of loop for this file */
}
/* Ended either on an EOF (well, actually NULL return--
* it *could* be some sort of file error, but
* but if the file was opened successfully, this is
* unlikely. Besides, error checking on streams
* doesn't allow us to decide exactly what went
* wrong, so I'm going to be very Unix-like and ignore
* it!), or a closed file, or a received line.
* If an EOF, close the file and mark it in the
* list. In any case, output the delimiter of choice.
*/
if(!strend)
{
if(fileptr[index] != CLOSED)
{
fclose(fileptr[index]);
fileptr[index] = CLOSED;
filecnt--;
}
/* Is this the end of the whole thing? */
if((fileptr[index+1] == ENDLIST) && !somedone)
continue; /* EXITS */
/* Ok, some files not closed this line. Last file? */
if(fileptr[index+1] == ENDLIST)
{
if(delbuf[0])
{
fputs(&delbuf[1],stdout);
delbuf[0] = 0;
}
putc((int)NL,stdout);
continue; /* Next read of files */
}else
{
/* Closed file; setup delim */
if(*delimptr != DEL)
{
delbuf[0]++;
delbuf[delbuf[0]] = *delimptr++;
delbuf[delbuf[0]+1] = '\0';
}else
delimptr++;
}
/* Reset end of delimiter string if necessary */
if(*delimptr == '\0')
delimptr = delims;
}else
{
/* Some data read. */
somedone++;
/* Any saved delims? */
if(delbuf[0])
{
fputs(&delbuf[1],stdout);
delbuf[0] = 0;
}
/* If last file, last char will be NL. */
if(fileptr[index+1] != ENDLIST)
{
if(*delimptr == DEL)
{
delimptr++;
iobuff[strend-1] = '\0'; /* No delim */
}else
iobuff[strend-1] = *delimptr++;
}
if(*delimptr == '\0')
delimptr = delims;
/* Now dump the buffer */
fputs(iobuff,stdout);
}
}
}
}
doserial(nfiles,fnamptr)
int nfiles;
char **fnamptr;
{
/*
* Do serial paste. Simply scarf characters, performing
* one-character buffering to facilitate delim processing.
*/
register int charnew,charold;
register char *delimptr;
register FILE *fileptr;
FILE *fopen();
for(;nfiles;nfiles--,fnamptr++)
{
if(fnamptr[0][0] == '-')
fileptr = stdin;
else
{
fileptr = fopen(*fnamptr,"r");
if(fileptr == NULL)
prerr(BADFILE,*fnamptr);
}
/*
* The file is open; just keep taking characters,
* stashing them in charnew; output charold, converting to
* the appropriate delimiter character if needful. After the
* EOF, simply output 'charold' if it's a newline; otherwise,
* output it and then a newline.
*/
delimptr = delims; /* Set up for delimiter string */
if((charold = getc(fileptr)) == EOF)
{
/* Empty file! */
putc(NL,stdout);
continue; /* Go on to the next file */
}
/* Ok, 'charold' is set up. Hit it! */
while((charnew = getc(fileptr)) != EOF)
{
/* Ok, process the old character */
if(charold == NL)
{
if(*delimptr != DEL)
putc(*delimptr++,stdout);
/* Reset pointer at end of delimiter string */
if(*delimptr == '\0')
delimptr = delims;
} else
putc((char)charold,stdout);
charold = charnew;
}
/* Ok, hit EOF. Process that last character */
putc((char)charold,stdout);
if((char)charold != NL)
putc(NL,stdout);
}
}
delimbuild(strptr)
char *strptr;
{
/*
* Process the delimiter string into something that can be
* used by the routines. This involves, primarily, collapsing
* the backslash representations of special characters into
* their actual values, and terminating the string in a manner
* that the routines can recognize. The set of possible backslash
* characters has been expanded beyond that recognized by the
* vanilla Unix(Tm) version.
*/
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
{
strptr++; /* Get past escape character */
switch(*strptr)
{
case '0':
*strout++ = DEL;
break;
case 't':
#ifdef CPM
case 'T':
#endif
*strout++ = TAB;
break;
case 'n':
#ifdef CPM
case 'N':
#endif
*strout++ = NL;
break;
case 'b':
#ifdef CPM
case 'B':
#endif
*strout++ = BS;
break;
case 'f':
#ifdef CPM
case 'F':
#endif
*strout++ = FF;
break;
case 'r':
#ifdef CPM
case 'R':
#endif
*strout++ = CR;
break;
case 'v':
#ifdef CPM
case 'V':
#endif
*strout++ = VT;
break;
default:
*strout++ = *strptr;
}
strptr++;
}
}
*strout = '\0'; /* Heaven forfend that we forget this! */
}
prerr(etype, estring)
int etype;
char *estring;
{
switch(etype)
{
case USAGE:
fprintf(stderr,"%s : Usage: %s [-s] [-d<delimiterstring>] file1 file2 ...\n",cmdnam,cmdnam);
break;
case NODELIM:
fprintf(stderr,"%s : no delimiters\n",cmdnam);
break;
case BADFILE:
fprintf(stderr,"%s : %s : cannot open\n",cmdnam,estring);
break;
case TOOMANY:
fprintf(stderr,"%s : too many files\n",cmdnam);
break;
}
exit(1);
}