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/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "text.h"
#include "utf.h"
#include "util.h"
enum {
INIT = 1,
GROW = 2,
};
enum {
EXPAND = 0,
RESET = 1,
};
enum { FIELD_ERROR = -2, };
struct field {
char *s;
size_t len;
};
struct jline {
struct line text;
size_t nf;
size_t maxf;
struct field *fields;
};
struct spec {
size_t fileno;
size_t fldno;
};
struct outlist {
size_t ns;
size_t maxs;
struct spec **specs;
};
struct span {
size_t nl;
size_t maxl;
struct jline **lines;
};
static char *sep = NULL;
static char *replace = NULL;
static const char defaultofs = ' ';
static const int jfield = 1; /* POSIX default join field */
static int unpairsa = 0, unpairsb = 0;
static int oflag = 0;
static int pairs = 1;
static size_t seplen;
static struct outlist output;
static void
usage(void)
{
eprintf("usage: %s [-1 field] [-2 field] [-o list] [-e string] "
"[-a | -v fileno] [-t delim] file1 file2\n", argv0);
}
static void
prfield(struct field *fp)
{
if (fwrite(fp->s, 1, fp->len, stdout) != fp->len)
eprintf("fwrite:");
}
static void
prsep(void)
{
if (sep)
fwrite(sep, 1, seplen, stdout);
else
putchar(defaultofs);
}
static void
swaplines(struct jline *la, struct jline *lb)
{
struct jline tmp;
tmp = *la;
*la = *lb;
*lb = tmp;
}
static void
prjoin(struct jline *la, struct jline *lb, size_t jfa, size_t jfb)
{
struct spec *sp;
struct field *joinfield;
size_t i;
if (jfa >= la->nf || jfb >= lb->nf)
return;
joinfield = &la->fields[jfa];
if (oflag) {
for (i = 0; i < output.ns; i++) {
sp = output.specs[i];
if (sp->fileno == 1) {
if (sp->fldno < la->nf)
prfield(&la->fields[sp->fldno]);
else if (replace)
fputs(replace, stdout);
} else if (sp->fileno == 2) {
if (sp->fldno < lb->nf)
prfield(&lb->fields[sp->fldno]);
else if (replace)
fputs(replace, stdout);
} else if (sp->fileno == 0) {
prfield(joinfield);
}
if (i < output.ns - 1)
prsep();
}
} else {
prfield(joinfield);
prsep();
for (i = 0; i < la->nf; i++) {
if (i != jfa) {
prfield(&la->fields[i]);
prsep();
}
}
for (i = 0; i < lb->nf; i++) {
if (i != jfb) {
prfield(&lb->fields[i]);
if (i < lb->nf - 1)
prsep();
}
}
}
putchar('\n');
}
static void
prline(struct jline *lp)
{
if (fwrite(lp->text.data, 1, lp->text.len, stdout) != lp->text.len)
eprintf("fwrite:");
putchar('\n');
}
static int
jlinecmp(struct jline *la, struct jline *lb, size_t jfa, size_t jfb)
{
int status;
/* return FIELD_ERROR if both lines are short */
if (jfa >= la->nf) {
status = (jfb >= lb->nf) ? FIELD_ERROR : -1;
} else if (jfb >= lb->nf) {
status = 1;
} else {
status = memcmp(la->fields[jfa].s, lb->fields[jfb].s,
MAX(la->fields[jfa].len, lb->fields[jfb].len));
LIMIT(status, -1, 1);
}
return status;
}
static void
addfield(struct jline *lp, char *sp, size_t len)
{
if (lp->nf >= lp->maxf) {
lp->fields = ereallocarray(lp->fields, (GROW * lp->maxf),
sizeof(struct field));
lp->maxf *= GROW;
}
lp->fields[lp->nf].s = sp;
lp->fields[lp->nf].len = len;
lp->nf++;
}
static void
prspanjoin(struct span *spa, struct span *spb, size_t jfa, size_t jfb)
{
size_t i, j;
for (i = 0; i < (spa->nl - 1); i++)
for (j = 0; j < (spb->nl - 1); j++)
prjoin(spa->lines[i], spb->lines[j], jfa, jfb);
}
static struct jline *
makeline(char *s, size_t len)
{
struct jline *lp;
char *tmp;
size_t i, end;
if (s[len - 1] == '\n')
s[--len] = '\0';
lp = ereallocarray(NULL, INIT, sizeof(struct jline));
lp->text.data = s;
lp->text.len = len;
lp->fields = ereallocarray(NULL, INIT, sizeof(struct field));
lp->nf = 0;
lp->maxf = INIT;
for (i = 0; i < lp->text.len && isblank(lp->text.data[i]); i++)
;
while (i < lp->text.len) {
if (sep) {
if ((lp->text.len - i) < seplen ||
!(tmp = memmem(lp->text.data + i,
lp->text.len - i, sep, seplen))) {
goto eol;
}
end = tmp - lp->text.data;
addfield(lp, lp->text.data + i, end - i);
i = end + seplen;
} else {
for (end = i; !(isblank(lp->text.data[end])); end++) {
if (end + 1 == lp->text.len)
goto eol;
}
addfield(lp, lp->text.data + i, end - i);
for (i = end; isblank(lp->text.data[i]); i++)
;
}
}
eol:
addfield(lp, lp->text.data + i, lp->text.len - i);
return lp;
}
static int
addtospan(struct span *sp, FILE *fp, int reset)
{
char *newl = NULL;
ssize_t len;
size_t size = 0;
if ((len = getline(&newl, &size, fp)) < 0) {
if (ferror(fp))
eprintf("getline:");
else
return 0;
}
if (reset)
sp->nl = 0;
if (sp->nl >= sp->maxl) {
sp->lines = ereallocarray(sp->lines, (GROW * sp->maxl),
sizeof(struct jline *));
sp->maxl *= GROW;
}
sp->lines[sp->nl] = makeline(newl, len);
sp->nl++;
return 1;
}
static void
initspan(struct span *sp)
{
sp->nl = 0;
sp->maxl = INIT;
sp->lines = ereallocarray(NULL, INIT, sizeof(struct jline *));
}
static void
freespan(struct span *sp)
{
size_t i;
for (i = 0; i < sp->nl; i++) {
free(sp->lines[i]->fields);
free(sp->lines[i]->text.data);
}
free(sp->lines);
}
static void
initolist(struct outlist *olp)
{
olp->ns = 0;
olp->maxs = 1;
olp->specs = ereallocarray(NULL, INIT, sizeof(struct spec *));
}
static void
addspec(struct outlist *olp, struct spec *sp)
{
if (olp->ns >= olp->maxs) {
olp->specs = ereallocarray(olp->specs, (GROW * olp->maxs),
sizeof(struct spec *));
olp->maxs *= GROW;
}
olp->specs[olp->ns] = sp;
olp->ns++;
}
static struct spec *
makespec(char *s)
{
struct spec *sp;
int fileno;
size_t fldno;
if (!strcmp(s, "0")) { /* join field must be 0 and nothing else */
fileno = 0;
fldno = 0;
} else if ((s[0] == '1' || s[0] == '2') && s[1] == '.') {
fileno = s[0] - '0';
fldno = estrtonum(&s[2], 1, MIN(LLONG_MAX, SIZE_MAX)) - 1;
} else {
eprintf("%s: invalid format\n", s);
}
sp = ereallocarray(NULL, INIT, sizeof(struct spec));
sp->fileno = fileno;
sp->fldno = fldno;
return sp;
}
static void
makeolist(struct outlist *olp, char *s)
{
char *item, *sp;
sp = s;
while (sp) {
item = sp;
sp = strpbrk(sp, ", \t");
if (sp)
*sp++ = '\0';
addspec(olp, makespec(item));
}
}
static void
freespecs(struct outlist *olp)
{
size_t i;
for (i = 0; i < olp->ns; i++)
free(olp->specs[i]);
}
static void
join(FILE *fa, FILE *fb, size_t jfa, size_t jfb)
{
struct span spa, spb;
int cmp, eofa, eofb;
initspan(&spa);
initspan(&spb);
cmp = eofa = eofb = 0;
addtospan(&spa, fa, RESET);
addtospan(&spb, fb, RESET);
while (spa.nl && spb.nl) {
if ((cmp = jlinecmp(spa.lines[0], spb.lines[0], jfa, jfb)) < 0) {
if (unpairsa)
prline(spa.lines[0]);
if (!addtospan(&spa, fa, RESET)) {
if (unpairsb) { /* a is EOF'd; print the rest of b */
do
prline(spb.lines[0]);
while (addtospan(&spb, fb, RESET));
}
eofa = eofb = 1;
} else {
continue;
}
} else if (cmp > 0) {
if (unpairsb)
prline(spb.lines[0]);
if (!addtospan(&spb, fb, RESET)) {
if (unpairsa) { /* b is EOF'd; print the rest of a */
do
prline(spa.lines[0]);
while (addtospan(&spa, fa, RESET));
}
eofa = eofb = 1;
} else {
continue;
}
} else if (cmp == 0) {
/* read all consecutive matching lines from a */
do {
if (!addtospan(&spa, fa, EXPAND)) {
eofa = 1;
spa.nl++;
break;
}
} while (jlinecmp(spa.lines[spa.nl-1], spb.lines[0], jfa, jfb) == 0);
/* read all consecutive matching lines from b */
do {
if (!addtospan(&spb, fb, EXPAND)) {
eofb = 1;
spb.nl++;
break;
}
} while (jlinecmp(spa.lines[0], spb.lines[spb.nl-1], jfa, jfb) == 0);
if (pairs)
prspanjoin(&spa, &spb, jfa, jfb);
} else { /* FIELD_ERROR: both lines lacked join fields */
if (unpairsa)
prline(spa.lines[0]);
if (unpairsb)
prline(spb.lines[0]);
eofa = addtospan(&spa, fa, RESET) ? 0 : 1;
eofb = addtospan(&spb, fb, RESET) ? 0 : 1;
if (!eofa && !eofb)
continue;
}
if (eofa) {
spa.nl = 0;
} else {
swaplines(spa.lines[0], spa.lines[spa.nl - 1]); /* ugly */
spa.nl = 1;
}
if (eofb) {
spb.nl = 0;
} else {
swaplines(spb.lines[0], spb.lines[spb.nl - 1]); /* ugly */
spb.nl = 1;
}
}
freespan(&spa);
freespan(&spb);
}
int
main(int argc, char *argv[])
{
size_t jf[2] = { jfield, jfield, };
FILE *fp[2];
int ret = 0, n;
char *fno;
ARGBEGIN {
case '1':
jf[0] = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
break;
case '2':
jf[1] = estrtonum(EARGF(usage()), 1, MIN(LLONG_MAX, SIZE_MAX));
break;
case 'a':
fno = EARGF(usage());
if (strcmp(fno, "1") == 0)
unpairsa = 1;
else if (strcmp(fno, "2") == 0)
unpairsb = 1;
else
usage();
break;
case 'e':
replace = EARGF(usage());
break;
case 'o':
oflag = 1;
initolist(&output);
makeolist(&output, EARGF(usage()));
break;
case 't':
sep = EARGF(usage());
break;
case 'v':
pairs = 0;
fno = EARGF(usage());
if (strcmp(fno, "1") == 0)
unpairsa = 1;
else if (strcmp(fno, "2") == 0)
unpairsb = 1;
else
usage();
break;
default:
usage();
} ARGEND
if (sep)
seplen = unescape(sep);
if (argc != 2)
usage();
for (n = 0; n < 2; n++) {
if (!strcmp(argv[n], "-")) {
argv[n] = "<stdin>";
fp[n] = stdin;
} else if (!(fp[n] = fopen(argv[n], "r"))) {
eprintf("fopen %s:", argv[n]);
}
}
jf[0]--;
jf[1]--;
join(fp[0], fp[1], jf[0], jf[1]);
if (oflag)
freespecs(&output);
if (fshut(fp[0], argv[0]) | (fp[0] != fp[1] && fshut(fp[1], argv[1])) |
fshut(stdout, "<stdout>"))
ret = 2;
return ret;
}