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Add mandoc-manpage for comm(1) and clean up code

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and mark it as finished in README.
This commit is contained in:
FRIGN 2015-01-18 00:07:29 +01:00 committed by sin
parent 572cea058c
commit f9a1e11661
3 changed files with 80 additions and 74 deletions
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2
README
View File

@ -18,7 +18,7 @@ The following tools are implemented (* == finished):
* cksum yes none * cksum yes none
* cmp yes none * cmp yes none
* cols non-posix none * cols non-posix none
comm yes none * comm yes none
cp no -H, -i, -L cp no -H, -i, -L
* cron non-posix none * cron non-posix none
cut yes none cut yes none

74
comm.1
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@ -1,33 +1,43 @@
.TH COMM 1 sbase\-VERSION .Dd January 18, 2015
.SH NAME .Dt COMM 1 sbase\-VERSION
comm \- select or reject lines common to two files .Sh NAME
.SH SYNOPSIS .Nm comm
.B comm .Nd select or reject lines common to two files
.RB [ \-123 ] .Sh SYNOPSIS
.IR file1 .Nm comm
.IR file2 .Op Fl 123
.SH DESCRIPTION .Ar file1
The comm utility reads .Ar file2
.IR file1 .Sh DESCRIPTION
.Nm
reads
.Ar file1
and and
.IR file2, .Ar file2,
which should be sorted lexically, which should both be sorted lexically, and writes three text columns
and produces three text columns as output: lines only in to stdout:
.IR file1; .Bl -tag -width Ds
lines only in .It 1
.IR file2; Lines only in
and lines in both files. .Ar file1 .
.SH OPTIONS .It 2
.TP Lines only in
.BI \-1 .Ar file2 .
Suppress printing of column 1 .It 3
.TP Common lines.
.BI \-2 .El
Suppress printing of column 2 .Sh OPTIONS
.TP .Bl -tag -width Ds
.BI \-3 .It Fl 1 | Fl 2 | Fl 3
Suppress printing of column 3 Suppress column 1 | 2 | 3
.SH SEE ALSO .El
.IR cmp (1), .Sh SEE ALSO
.IR sort (1), .Xr cmp 1 ,
.IR uniq (1) .Xr sort 1 ,
.Xr uniq 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.

76
comm.c
View File

@ -8,12 +8,44 @@
#define CLAMP(x, l, h) MIN(h, MAX(l, x)) #define CLAMP(x, l, h) MIN(h, MAX(l, x))
static void printline(int, char *);
static char *nextline(char *, int, FILE *, char *);
static void finish(int, FILE *, char *);
static int show = 0x07; static int show = 0x07;
static void
printline(int pos, char *line)
{
int i;
if (!(show & (0x1 << pos)))
return;
for (i = 0; i < pos; i++) {
if (show & (0x1 << i))
putchar('\t');
}
printf("%s", line);
}
static char *
nextline(char *buf, int n, FILE *f, char *name)
{
buf = fgets(buf, n, f);
if (!buf && !feof(f))
eprintf("%s: read error:", name);
if (buf && !strchr(buf, '\n'))
eprintf("%s: line too long\n", name);
return buf;
}
static void
finish(int pos, FILE *f, char *name)
{
char buf[LINE_MAX + 1];
while (nextline(buf, sizeof(buf), f, name))
printline(pos, buf);
exit(1);
}
static void static void
usage(void) usage(void)
{ {
@ -73,39 +105,3 @@ main(int argc, char *argv[])
return 0; return 0;
} }
static void
printline(int pos, char *line)
{
int i;
if (!(show & (0x1 << pos)))
return;
for (i = 0; i < pos; i++) {
if (show & (0x1 << i))
putchar('\t');
}
printf("%s", line);
}
static char *
nextline(char *buf, int n, FILE *f, char *name)
{
buf = fgets(buf, n, f);
if (!buf && !feof(f))
eprintf("%s: read error:", name);
if (buf && !strchr(buf, '\n'))
eprintf("%s: line too long\n", name);
return buf;
}
static void
finish(int pos, FILE *f, char *name)
{
char buf[LINE_MAX+1];
while (nextline(buf, sizeof(buf), f, name))
printline(pos, buf);
exit(1);
}