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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1992-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* David Korn
* AT&T Bell Laboratories
*
* comm
*/
static const char usage[] =
"[-?\n@(#)$Id: comm (AT&T Research) 1999-04-28 $\n]"
USAGE_LICENSE
"[+NAME?comm - select or reject lines common to two files]"
"[+DESCRIPTION?\bcomm\b reads two files \afile1\a and \afile2\a "
"which should be ordered in the collating sequence of the "
"current locale, and produces three text columns as output:]{"
"[+1?Lines only in \afile1\a.]"
"[+2?Lines only in \afile2\a.]"
"[+3?Lines in both files.]"
"}"
"[+?If lines in either file are not ordered according to the collating "
"sequence of the current locale, the results are not specified.]"
"[+?If either \afile1\a or \afile2\a is \b-\b, \bcomm\b "
"uses standard input starting at the current location.]"
"[1?Suppress the output column of lines unique to \afile1\a.]"
"[2?Suppress the output column of lines unique to \afile2\a.]"
"[3?Suppress the output column of lines duplicate in \afile1\a and \afile2\a.]"
"\n"
"\nfile1 file2\n"
"\n"
"[+EXIT STATUS?]{"
"[+0?Both files processed successfully.]"
"[+>0?An error occurred.]"
"}"
"[+SEE ALSO?\bcmp\b(1), \bdiff\b(1)]"
;
#include <cmd.h>
#define C_FILE1 1
#define C_FILE2 2
#define C_COMMON 4
#define C_ALL (C_FILE1|C_FILE2|C_COMMON)
static int comm(Sfio_t *in1, Sfio_t *in2, register Sfio_t *out,register int mode)
{
register char *cp1, *cp2;
register int n1, n2, n, comp;
if(cp1 = sfgetr(in1,'\n',0))
n1 = sfvalue(in1);
if(cp2 = sfgetr(in2,'\n',0))
n2 = sfvalue(in2);
while(cp1 && cp2)
{
n=(n1<n2?n1:n2);
if((comp=memcmp(cp1,cp2,n-1))==0 && (comp=n1-n2)==0)
{
if(mode&C_COMMON)
{
if(mode!=C_COMMON)
{
sfputc(out,'\t');
if(mode==C_ALL)
sfputc(out,'\t');
}
if(sfwrite(out,cp1,n) < 0)
return(-1);
}
if(cp1 = sfgetr(in1,'\n',0))
n1 = sfvalue(in1);
if(cp2 = sfgetr(in2,'\n',0))
n2 = sfvalue(in2);
}
else if(comp > 0)
{
if(mode&C_FILE2)
{
if(mode&C_FILE1)
sfputc(out,'\t');
if(sfwrite(out,cp2,n2) < 0)
return(-1);
}
if(cp2 = sfgetr(in2,'\n',0))
n2 = sfvalue(in2);
}
else
{
if((mode&C_FILE1) && sfwrite(out,cp1,n1) < 0)
return(-1);
if(cp1 = sfgetr(in1,'\n',0))
n1 = sfvalue(in1);
}
}
n = 0;
if(cp2)
{
cp1 = cp2;
in1 = in2;
n1 = n2;
if(mode&C_FILE1)
n = 1;
mode &= C_FILE2;
}
else
mode &= C_FILE1;
if(!mode || !cp1)
{
if(cp1 && in1==sfstdin)
sfseek(in1,(Sfoff_t)0,SEEK_END);
return(0);
}
/* process the remaining stream */
while(1)
{
if(n)
sfputc(out,'\t');
if(sfwrite(out,cp1,n1) < 0)
return(-1);
if(!(cp1 = sfgetr(in1,'\n',0)))
return(0);
n1 = sfvalue(in1);
}
/* NOT REACHED */
}
int
b_comm(int argc, char *argv[], void* context)
{
register int n;
register int mode = C_FILE1|C_FILE2|C_COMMON;
register char *cp;
Sfio_t *f1, *f2;
cmdinit(argc, argv, context, ERROR_CATALOG, 0);
while (n = optget(argv, usage)) switch (n)
{
case '1':
mode &= ~C_FILE1;
break;
case '2':
mode &= ~C_FILE2;
break;
case '3':
mode &= ~C_COMMON;
break;
case ':':
error(2, "%s",opt_info.arg);
break;
case '?':
error(ERROR_usage(2), "%s",opt_info.arg);
break;
}
argv += opt_info.index;
argc -= opt_info.index;
if(error_info.errors || argc!=2)
error(ERROR_usage(2),"%s",optusage(NiL));
cp = *argv++;
if(streq(cp,"-"))
f1 = sfstdin;
else if(!(f1 = sfopen(NiL, cp,"r")))
error(ERROR_system(1),"%s: cannot open",cp);
cp = *argv;
if(streq(cp,"-"))
f2 = sfstdin;
else if(!(f2 = sfopen(NiL, cp,"r")))
error(ERROR_system(1),"%s: cannot open",cp);
if(mode)
{
if(comm(f1,f2,sfstdout,mode) < 0)
error(ERROR_system(1)," write error");
}
else if(f1==sfstdin || f2==sfstdin)
sfseek(sfstdin,(Sfoff_t)0,SEEK_END);
if(f1!=sfstdin)
sfclose(f1);
if(f2!=sfstdin)
sfclose(f2);
return(error_info.errors);
}
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