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minix/usr.bin/join/join.c
Lionel Sambuc 6e0ed9c90c Replacing join with NetBSD join 
Change-Id: I1257736f755eab0ce39124f0d78bfa48426ba820
2012-12-07 13:58:07 +01:00

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/* $NetBSD: join.c,v 1.31 2011/09/04 20:27:52 joerg Exp $ */
/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Steve Hayman of Indiana University, Michiro Hikida and David
* Goodenough.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1991\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)join.c 5.1 (Berkeley) 11/18/91";
#else
__RCSID("$NetBSD: join.c,v 1.31 2011/09/04 20:27:52 joerg Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* There's a structure per input file which encapsulates the state of the
* file. We repeatedly read lines from each file until we've read in all
* the consecutive lines from the file with a common join field. Then we
* compare the set of lines with an equivalent set from the other file.
*/
typedef struct {
char *line; /* line */
u_long linealloc; /* line allocated count */
char **fields; /* line field(s) */
u_long fieldcnt; /* line field(s) count */
u_long fieldalloc; /* line field(s) allocated count */
} LINE;
static char nolineline[1] = { '\0' };
static LINE noline = {nolineline, 0, 0, 0, 0}; /* arg for outfield if no line to output */
typedef struct {
FILE *fp; /* file descriptor */
u_long joinf; /* join field (-1, -2, -j) */
int unpair; /* output unpairable lines (-a) */
int number; /* 1 for file 1, 2 for file 2 */
LINE *set; /* set of lines with same field */
u_long pushback; /* line on the stack */
u_long setcnt; /* set count */
u_long setalloc; /* set allocated count */
} INPUT;
static INPUT input1 = { NULL, 0, 0, 1, NULL, -1, 0, 0, },
input2 = { NULL, 0, 0, 2, NULL, -1, 0, 0, };
typedef struct {
u_long fileno; /* file number */
u_long fieldno; /* field number */
} OLIST;
static OLIST *olist; /* output field list */
static u_long olistcnt; /* output field list count */
static u_long olistalloc; /* output field allocated count */
static int joinout = 1; /* show lines with matched join fields (-v) */
static int needsep; /* need separator character */
static int spans = 1; /* span multiple delimiters (-t) */
static char *empty; /* empty field replacement string (-e) */
static const char *tabchar = " \t"; /* delimiter characters (-t) */
static int cmp(LINE *, u_long, LINE *, u_long);
__dead static void enomem(void);
static void fieldarg(char *);
static void joinlines(INPUT *, INPUT *);
static void obsolete(char **);
static void outfield(LINE *, u_long);
static void outoneline(INPUT *, LINE *);
static void outtwoline(INPUT *, LINE *, INPUT *, LINE *);
static void slurp(INPUT *);
__dead static void usage(void);
int
main(int argc, char *argv[])
{
INPUT *F1, *F2;
int aflag, ch, cval, vflag;
char *end;
F1 = &input1;
F2 = &input2;
aflag = vflag = 0;
obsolete(argv);
while ((ch = getopt(argc, argv, "\01a:e:j:1:2:o:t:v:")) != -1) {
switch (ch) {
case '\01':
aflag = 1;
F1->unpair = F2->unpair = 1;
break;
case '1':
if ((F1->joinf = strtol(optarg, &end, 10)) < 1) {
warnx("-1 option field number less than 1");
usage();
}
if (*end) {
warnx("illegal field number -- %s", optarg);
usage();
}
--F1->joinf;
break;
case '2':
if ((F2->joinf = strtol(optarg, &end, 10)) < 1) {
warnx("-2 option field number less than 1");
usage();
}
if (*end) {
warnx("illegal field number -- %s", optarg);
usage();
}
--F2->joinf;
break;
case 'a':
aflag = 1;
switch(strtol(optarg, &end, 10)) {
case 1:
F1->unpair = 1;
break;
case 2:
F2->unpair = 1;
break;
default:
warnx("-a option file number not 1 or 2");
usage();
break;
}
if (*end) {
warnx("illegal file number -- %s", optarg);
usage();
}
break;
case 'e':
empty = optarg;
break;
case 'j':
if ((F1->joinf = F2->joinf =
strtol(optarg, &end, 10)) < 1) {
warnx("-j option field number less than 1");
usage();
}
if (*end) {
warnx("illegal field number -- %s", optarg);
usage();
}
--F1->joinf;
--F2->joinf;
break;
case 'o':
fieldarg(optarg);
break;
case 't':
spans = 0;
if (strlen(tabchar = optarg) != 1) {
warnx("illegal tab character specification");
usage();
}
break;
case 'v':
vflag = 1;
joinout = 0;
switch(strtol(optarg, &end, 10)) {
case 1:
F1->unpair = 1;
break;
case 2:
F2->unpair = 1;
break;
default:
warnx("-v option file number not 1 or 2");
usage();
break;
}
if (*end) {
warnx("illegal file number -- %s", optarg);
usage();
}
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (aflag && vflag)
errx(1, "-a and -v options mutually exclusive");
if (argc != 2)
usage();
/* Open the files; "-" means stdin. */
if (!strcmp(*argv, "-"))
F1->fp = stdin;
else if ((F1->fp = fopen(*argv, "r")) == NULL)
err(1, "%s", *argv);
++argv;
if (!strcmp(*argv, "-"))
F2->fp = stdin;
else if ((F2->fp = fopen(*argv, "r")) == NULL)
err(1, "%s", *argv);
if (F1->fp == stdin && F2->fp == stdin)
errx(1, "only one input file may be stdin");
slurp(F1);
slurp(F2);
while (F1->setcnt && F2->setcnt) {
cval = cmp(F1->set, F1->joinf, F2->set, F2->joinf);
if (cval == 0) {
/* Oh joy, oh rapture, oh beauty divine! */
if (joinout)
joinlines(F1, F2);
slurp(F1);
slurp(F2);
} else if (cval < 0) {
/* File 1 takes the lead... */
if (F1->unpair)
joinlines(F1, NULL);
slurp(F1);
} else {
/* File 2 takes the lead... */
if (F2->unpair)
joinlines(F2, NULL);
slurp(F2);
}
}
/*
* Now that one of the files is used up, optionally output any
* remaining lines from the other file.
*/
if (F1->unpair)
while (F1->setcnt) {
joinlines(F1, NULL);
slurp(F1);
}
if (F1->fp != stdin)
fclose(F1->fp);
if (F2->unpair)
while (F2->setcnt) {
joinlines(F2, NULL);
slurp(F2);
}
if (F2->fp != stdin)
fclose(F2->fp);
return 0;
}
static void
slurp(INPUT *F)
{
LINE *lp;
LINE tmp;
LINE *nline;
size_t len;
u_long cnt;
char *bp, *fieldp;
u_long nsize;
/*
* Read all of the lines from an input file that have the same
* join field.
*/
for (F->setcnt = 0;; ++F->setcnt) {
/*
* If we're out of space to hold line structures, allocate
* more. Initialize the structure so that we know that this
* is new space.
*/
if (F->setcnt == F->setalloc) {
cnt = F->setalloc;
if (F->setalloc == 0)
nsize = 64;
else
nsize = F->setalloc << 1;
if ((nline = realloc(F->set,
nsize * sizeof(LINE))) == NULL)
enomem();
F->set = nline;
F->setalloc = nsize;
memset(F->set + cnt, 0,
(F->setalloc - cnt) * sizeof(LINE));
}
/*
* Get any pushed back line, else get the next line. Allocate
* space as necessary. If taking the line from the stack swap
* the two structures so that we don't lose the allocated space.
* This could be avoided by doing another level of indirection,
* but it's probably okay as is.
*/
lp = &F->set[F->setcnt];
if (F->pushback != (u_long)-1) {
tmp = F->set[F->setcnt];
F->set[F->setcnt] = F->set[F->pushback];
F->set[F->pushback] = tmp;
F->pushback = (u_long)-1;
continue;
}
if ((bp = fgetln(F->fp, &len)) == NULL)
return;
if (lp->linealloc <= len + 1) {
char *n;
if (lp->linealloc == 0)
nsize = 128;
else
nsize = lp->linealloc;
while (nsize <= len + 1)
nsize <<= 1;
if ((n = realloc(lp->line,
nsize * sizeof(char))) == NULL)
enomem();
lp->line = n;
lp->linealloc = nsize;
}
memmove(lp->line, bp, len);
/* Replace trailing newline, if it exists. */
if (bp[len - 1] == '\n')
lp->line[len - 1] = '\0';
else
lp->line[len] = '\0';
bp = lp->line;
/* Split the line into fields, allocate space as necessary. */
lp->fieldcnt = 0;
while ((fieldp = strsep(&bp, tabchar)) != NULL) {
if (spans && *fieldp == '\0')
continue;
if (lp->fieldcnt == lp->fieldalloc) {
char **n;
if (lp->fieldalloc == 0)
nsize = 16;
else
nsize = lp->fieldalloc << 1;
if ((n = realloc(lp->fields,
nsize * sizeof(char *))) == NULL)
enomem();
lp->fields = n;
lp->fieldalloc = nsize;
}
lp->fields[lp->fieldcnt++] = fieldp;
}
/* See if the join field value has changed. */
if (F->setcnt && cmp(lp, F->joinf, lp - 1, F->joinf)) {
F->pushback = F->setcnt;
break;
}
}
}
static int
cmp(LINE *lp1, u_long fieldno1, LINE *lp2, u_long fieldno2)
{
if (lp1->fieldcnt <= fieldno1)
return (lp2->fieldcnt <= fieldno2 ? 0 : 1);
if (lp2->fieldcnt <= fieldno2)
return (-1);
return (strcmp(lp1->fields[fieldno1], lp2->fields[fieldno2]));
}
static void
joinlines(INPUT *F1, INPUT *F2)
{
u_long cnt1, cnt2;
/*
* Output the results of a join comparison. The output may be from
* either file 1 or file 2 (in which case the first argument is the
* file from which to output) or from both.
*/
if (F2 == NULL) {
for (cnt1 = 0; cnt1 < F1->setcnt; ++cnt1)
outoneline(F1, &F1->set[cnt1]);
return;
}
for (cnt1 = 0; cnt1 < F1->setcnt; ++cnt1)
for (cnt2 = 0; cnt2 < F2->setcnt; ++cnt2)
outtwoline(F1, &F1->set[cnt1], F2, &F2->set[cnt2]);
}
static void
outoneline(INPUT *F, LINE *lp)
{
u_long cnt;
/*
* Output a single line from one of the files, according to the
* join rules. This happens when we are writing unmatched single
* lines. Output empty fields in the right places.
*/
if (olist)
for (cnt = 0; cnt < olistcnt; ++cnt) {
if (olist[cnt].fileno == (u_long)F->number)
outfield(lp, olist[cnt].fieldno);
else
outfield(&noline, 1);
}
else
for (cnt = 0; cnt < lp->fieldcnt; ++cnt)
outfield(lp, cnt);
(void)printf("\n");
if (ferror(stdout))
err(1, "stdout");
needsep = 0;
}
static void
outtwoline(INPUT *F1, LINE *lp1, INPUT *F2, LINE *lp2)
{
u_long cnt;
/* Output a pair of lines according to the join list (if any). */
if (olist) {
for (cnt = 0; cnt < olistcnt; ++cnt)
if (olist[cnt].fileno == 1)
outfield(lp1, olist[cnt].fieldno);
else /* if (olist[cnt].fileno == 2) */
outfield(lp2, olist[cnt].fieldno);
} else {
/*
* Output the join field, then the remaining fields from F1
* and F2.
*/
outfield(lp1, F1->joinf);
for (cnt = 0; cnt < lp1->fieldcnt; ++cnt)
if (F1->joinf != cnt)
outfield(lp1, cnt);
for (cnt = 0; cnt < lp2->fieldcnt; ++cnt)
if (F2->joinf != cnt)
outfield(lp2, cnt);
}
(void)printf("\n");
if (ferror(stdout))
err(1, "stdout");
needsep = 0;
}
static void
outfield(LINE *lp, u_long fieldno)
{
if (needsep++)
(void)printf("%c", *tabchar);
if (!ferror(stdout)) {
if (lp->fieldcnt <= fieldno) {
if (empty != NULL)
(void)printf("%s", empty);
} else {
if (*lp->fields[fieldno] == '\0')
return;
(void)printf("%s", lp->fields[fieldno]);
}
}
if (ferror(stdout))
err(1, "stdout");
}
/*
* Convert an output list argument "2.1, 1.3, 2.4" into an array of output
* fields.
*/
static void
fieldarg(char *option)
{
u_long fieldno;
char *end, *token;
OLIST *n;
while ((token = strsep(&option, ", \t")) != NULL) {
if (*token == '\0')
continue;
if ((token[0] != '1' && token[0] != '2') || token[1] != '.')
errx(1, "malformed -o option field");
fieldno = strtol(token + 2, &end, 10);
if (*end)
errx(1, "malformed -o option field");
if (fieldno == 0)
errx(1, "field numbers are 1 based");
if (olistcnt == olistalloc) {
if ((n = realloc(olist,
(olistalloc + 50) * sizeof(OLIST))) == NULL)
enomem();
olist = n;
olistalloc += 50;
}
olist[olistcnt].fileno = token[0] - '0';
olist[olistcnt].fieldno = fieldno - 1;
++olistcnt;
}
}
static void
obsolete(char **argv)
{
size_t len;
char **p, *ap, *t;
while ((ap = *++argv) != NULL) {
/* Return if "--". */
if (ap[0] == '-' && ap[1] == '-')
return;
switch (ap[1]) {
case 'a':
/*
* The original join allowed "-a", which meant the
* same as -a1 plus -a2. POSIX 1003.2, Draft 11.2
* only specifies this as "-a 1" and "a -2", so we
* have to use another option flag, one that is
* unlikely to ever be used or accidentally entered
* on the command line. (Well, we could reallocate
* the argv array, but that hardly seems worthwhile.)
*/
if (ap[2] == '\0')
ap[1] = '\01';
break;
case 'j':
/*
* The original join allowed "-j[12] arg" and "-j arg".
* Convert the former to "-[12] arg". Don't convert
* the latter since getopt(3) can handle it.
*/
switch(ap[2]) {
case '1':
if (ap[3] != '\0')
goto jbad;
ap[1] = '1';
ap[2] = '\0';
break;
case '2':
if (ap[3] != '\0')
goto jbad;
ap[1] = '2';
ap[2] = '\0';
break;
case '\0':
break;
default:
jbad: errx(1, "illegal option -- %s", ap);
usage();
}
break;
case 'o':
/*
* The original join allowed "-o arg arg". Convert to
* "-o arg -o arg".
*/
if (ap[2] != '\0')
break;
for (p = argv + 2; *p; ++p) {
if ((p[0][0] != '1' && p[0][0] != '2') ||
p[0][1] != '.')
break;
len = strlen(*p);
if (len - 2 != strspn(*p + 2, "0123456789"))
break;
if ((t = malloc(len + 3)) == NULL)
enomem();
t[0] = '-';
t[1] = 'o';
memmove(t + 2, *p, len + 1);
*p = t;
}
argv = p - 1;
break;
}
}
}
static void
enomem(void)
{
errx(1, "no memory");
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-a fileno | -v fileno] [-e string] [-j fileno field]\n"
" [-o list] [-t char] [-1 field] [-2 field] file1 file2\n",
getprogname());
exit(1);
}
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