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freebsd/usr.bin/join/join.c
Juli Mallett dcd587c927 Support -o 0 in join(1) as per SUS. 
PR:		36072
Submitted by:	Tim J. Robbins <tim@robbins.dropbear.id.au>
Reviewed by:	mike
2002-03-26 03:44:04 +00:00

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/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Steve Hayman of the Computer Science Department, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1991, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)join.c 8.6 (Berkeley) 5/4/95";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/param.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;
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 */
int pushbool; /* if pushback is set */
u_long pushback; /* line on the stack */
u_long setcnt; /* set count */
u_long setalloc; /* set allocated count */
} INPUT;
INPUT input1 = { NULL, 0, 0, 1, NULL, 0, 0, 0, },
input2 = { NULL, 0, 0, 2, NULL, 0, 0, 0, };
typedef struct {
u_long filenum; /* file number */
u_long fieldno; /* field number */
} OLIST;
OLIST *olist; /* output field list */
u_long olistcnt; /* output field list count */
u_long olistalloc; /* output field allocated count */
int joinout = 1; /* show lines with matched join fields (-v) */
int needsep; /* need separator character */
int spans = 1; /* span multiple delimiters (-t) */
char *empty; /* empty field replacement string (-e) */
char *tabchar = " \t"; /* delimiter characters (-t) */
int cmp(LINE *, u_long, LINE *, u_long);
void fieldarg(char *);
void joinlines(INPUT *, INPUT *);
void obsolete(char **);
void outfield(LINE *, u_long, int);
void outoneline(INPUT *, LINE *);
void outtwoline(INPUT *, LINE *, INPUT *, LINE *);
void slurp(INPUT *);
void usage(void);
int
main(argc, argv)
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': /* See comment in obsolete(). */
aflag = 1;
F1->unpair = F2->unpair = 1;
break;
case '1':
if ((F1->joinf = strtol(optarg, &end, 10)) < 1)
errx(1, "-1 option field number less than 1");
if (*end)
errx(1, "illegal field number -- %s", optarg);
--F1->joinf;
break;
case '2':
if ((F2->joinf = strtol(optarg, &end, 10)) < 1)
errx(1, "-2 option field number less than 1");
if (*end)
errx(1, "illegal field number -- %s", optarg);
--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:
errx(1, "-a option file number not 1 or 2");
break;
}
if (*end)
errx(1, "illegal file number -- %s", optarg);
break;
case 'e':
empty = optarg;
break;
case 'j':
if ((F1->joinf = F2->joinf =
strtol(optarg, &end, 10)) < 1)
errx(1, "-j option field number less than 1");
if (*end)
errx(1, "illegal field number -- %s", optarg);
--F1->joinf;
--F2->joinf;
break;
case 'o':
fieldarg(optarg);
break;
case 't':
spans = 0;
if (strlen(tabchar = optarg) != 1)
errx(1, "illegal tab character specification");
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:
errx(1, "-v option file number not 1 or 2");
break;
}
if (*end)
errx(1, "illegal file number -- %s", optarg);
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (aflag && vflag)
errx(1, "the -a and -v options are 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 (F2->unpair)
while (F2->setcnt) {
joinlines(F2, NULL);
slurp(F2);
}
exit(0);
}
void
slurp(F)
INPUT *F;
{
LINE *lp, *lastlp, tmp;
size_t len;
int cnt;
char *bp, *fieldp;
/*
* Read all of the lines from an input file that have the same
* join field.
*/
F->setcnt = 0;
for (lastlp = NULL;; ++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;
F->setalloc += 50;
if ((F->set = realloc(F->set,
F->setalloc * sizeof(LINE))) == NULL)
err(1, NULL);
memset(F->set + cnt, 0, 50 * sizeof(LINE));
/* re-set lastlp in case it moved */
if (lastlp != NULL)
lastlp = &F->set[F->setcnt - 1];
}
/*
* 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 space allocated to
* either structure. This could be avoided by doing another
* level of indirection, but it's probably okay as is.
*/
lp = &F->set[F->setcnt];
if (F->setcnt)
lastlp = &F->set[F->setcnt - 1];
if (F->pushbool) {
tmp = F->set[F->setcnt];
F->set[F->setcnt] = F->set[F->pushback];
F->set[F->pushback] = tmp;
F->pushbool = 0;
continue;
}
if ((bp = fgetln(F->fp, &len)) == NULL)
return;
if (lp->linealloc <= len + 1) {
lp->linealloc += MAX(100, len + 1 - lp->linealloc);
if ((lp->line =
realloc(lp->line, lp->linealloc)) == NULL)
err(1, NULL);
}
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) {
lp->fieldalloc += 50;
if ((lp->fields = realloc(lp->fields,
lp->fieldalloc * sizeof(char *))) == NULL)
err(1, NULL);
}
lp->fields[lp->fieldcnt++] = fieldp;
}
/* See if the join field value has changed. */
if (lastlp != NULL && cmp(lp, F->joinf, lastlp, F->joinf)) {
F->pushbool = 1;
F->pushback = F->setcnt;
break;
}
}
}
int
cmp(lp1, fieldno1, lp2, fieldno2)
LINE *lp1, *lp2;
u_long fieldno1, 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]));
}
void
joinlines(F1, F2)
INPUT *F1, *F2;
{
int 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]);
}
void
outoneline(F, lp)
INPUT *F;
LINE *lp;
{
int 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].filenum == F->number)
outfield(lp, olist[cnt].fieldno, 0);
else if (olist[cnt].filenum == 0)
outfield(lp, F->joinf, 0);
else
outfield(lp, 0, 1);
}
else
for (cnt = 0; cnt < lp->fieldcnt; ++cnt)
outfield(lp, cnt, 0);
(void)printf("\n");
if (ferror(stdout))
err(1, "stdout");
needsep = 0;
}
void
outtwoline(F1, lp1, F2, lp2)
INPUT *F1, *F2;
LINE *lp1, *lp2;
{
int cnt;
/* Output a pair of lines according to the join list (if any). */
if (olist)
for (cnt = 0; cnt < olistcnt; ++cnt)
if (olist[cnt].filenum == 0) {
if (lp1->fieldcnt >= F1->joinf)
outfield(lp1, F1->joinf, 0);
else
outfield(lp2, F2->joinf, 0);
} else if (olist[cnt].filenum == 1)
outfield(lp1, olist[cnt].fieldno, 0);
else /* if (olist[cnt].filenum == 2) */
outfield(lp2, olist[cnt].fieldno, 0);
else {
/*
* Output the join field, then the remaining fields from F1
* and F2.
*/
outfield(lp1, F1->joinf, 0);
for (cnt = 0; cnt < lp1->fieldcnt; ++cnt)
if (F1->joinf != cnt)
outfield(lp1, cnt, 0);
for (cnt = 0; cnt < lp2->fieldcnt; ++cnt)
if (F2->joinf != cnt)
outfield(lp2, cnt, 0);
}
(void)printf("\n");
if (ferror(stdout))
err(1, "stdout");
needsep = 0;
}
void
outfield(lp, fieldno, out_empty)
LINE *lp;
u_long fieldno;
int out_empty;
{
if (needsep++)
(void)printf("%c", *tabchar);
if (!ferror(stdout)) {
if (lp->fieldcnt <= fieldno || out_empty) {
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.
*/
void
fieldarg(option)
char *option;
{
u_long fieldno, filenum;
char *end, *token;
while ((token = strsep(&option, ", \t")) != NULL) {
if (*token == '\0')
continue;
if (token[0] == '0')
filenum = fieldno = 0;
else if ((token[0] == '1' || token[0] == '2') &&
token[1] == '.') {
filenum = token[0] - '0';
fieldno = strtol(token + 2, &end, 10);
if (*end)
errx(1, "malformed -o option field");
if (fieldno == 0)
errx(1, "field numbers are 1 based");
--fieldno;
} else
errx(1, "malformed -o option field");
if (olistcnt == olistalloc) {
olistalloc += 50;
if ((olist = realloc(olist,
olistalloc * sizeof(OLIST))) == NULL)
err(1, NULL);
}
olist[olistcnt].filenum = filenum;
olist[olistcnt].fieldno = fieldno;
++olistcnt;
}
}
void
obsolete(argv)
char **argv;
{
int len;
char **p, *ap, *t;
while ((ap = *++argv) != NULL) {
/* Return if "--". */
if (ap[0] == '-' && ap[1] == '-')
return;
/* skip if not an option */
if (ap[0] != '-')
continue;
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] == '0' || (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)
err(1, NULL);
t[0] = '-';
t[1] = 'o';
memmove(t + 2, *p, len + 1);
*p = t;
}
argv = p - 1;
break;
}
}
}
void
usage()
{
(void)fprintf(stderr, "%s %s\n%s\n",
"usage: join [-a fileno | -v fileno ] [-e string] [-1 field]",
"[-2 field]",
" [-o list] [-t char] file1 file2");
exit(1);
}
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