path: root/usr.bin/infocmp/infocmp.c

/*	$OpenBSD: infocmp.c,v 1.17 2003/04/08 19:08:58 deraadt Exp $	*/

/****************************************************************************
 * Copyright (c) 1998,1999,2000 Free Software Foundation, Inc.              *
 *                                                                          *
 * Permission is hereby granted, free of charge, to any person obtaining a  *
 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
 *                                                                          *
 * Except as contained in this notice, the name(s) of the above copyright   *
 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
 *	infocmp.c -- decompile an entry, or compare two entries
 *		written by Eric S. Raymond
 */

#include <progs.priv.h>

#include <term_entry.h>
#include <dump_entry.h>

MODULE_ID("$From: infocmp.c,v 1.60 2001/02/24 22:03:12 tom Exp $")

#define L_CURL "{"
#define R_CURL "}"

#define MAXTERMS	32	/* max # terminal arguments we can handle */
#define MAX_STRING	1024	/* maximum formatted string */

const char *_nc_progname = "infocmp";

typedef char path[PATH_MAX];

/***************************************************************************
 *
 * The following control variables, together with the contents of the
 * terminfo entries, completely determine the actions of the program.
 *
 ***************************************************************************/

static char *tname[MAXTERMS];	/* terminal type names */
static ENTRY entries[MAXTERMS];	/* terminfo entries */
static int termcount;		/* count of terminal entries */

static bool limited = TRUE;	/* "-r" option is not set */
static bool quiet = FALSE;
static const char *bool_sep = ":";
static const char *s_absent = "NULL";
static const char *s_cancel = "NULL";
static const char *tversion;	/* terminfo version selected */
static int itrace;		/* trace flag for debugging */
static int mwidth = 60;
static int numbers = 0;		/* format "%'char'" to/from "%{number}" */
static int outform = F_TERMINFO;	/* output format */
static int sortmode;		/* sort_mode */

/* main comparison mode */
static int compare;
#define C_DEFAULT	0	/* don't force comparison mode */
#define C_DIFFERENCE	1	/* list differences between two terminals */
#define C_COMMON	2	/* list common capabilities */
#define C_NAND		3	/* list capabilities in neither terminal */
#define C_USEALL	4	/* generate relative use-form entry */
static bool ignorepads;		/* ignore pad prefixes when diffing */

#if NO_LEAKS
#undef ExitProgram
static void
ExitProgram(int code) GCC_NORETURN;
/* prototype is to get gcc to accept the noreturn attribute */
     static void
       ExitProgram(int code)
{
    while (termcount-- > 0)
	_nc_free_termtype(&entries[termcount].tterm);
    _nc_leaks_dump_entry();
    _nc_free_and_exit(code);
}
#endif

static char *
canonical_name(char *ptr, char *buf, size_t bufl)
/* extract the terminal type's primary name */
{
    char *bp;

    (void) strlcpy(buf, ptr, bufl);
    if ((bp = strchr(buf, '|')) != 0)
	*bp = '\0';

    return (buf);
}

/***************************************************************************
 *
 * Predicates for dump function
 *
 ***************************************************************************/

static int
capcmp(int idx, const char *s, const char *t)
/* capability comparison function */
{
    if (!VALID_STRING(s) && !VALID_STRING(t))
	return (s != t);
    else if (!VALID_STRING(s) || !VALID_STRING(t))
	return (1);

    if ((idx == acs_chars_index) || !ignorepads)
	return (strcmp(s, t));
    else
	return (_nc_capcmp(s, t));
}

static int
use_predicate(int type, int idx)
/* predicate function to use for use decompilation */
{
    ENTRY *ep;

    switch (type) {
    case BOOLEAN:
	{
	    int is_set = FALSE;

	    /*
	     * This assumes that multiple use entries are supposed
	     * to contribute the logical or of their boolean capabilities.
	     * This is true if we take the semantics of multiple uses to
	     * be 'each capability gets the first non-default value found
	     * in the sequence of use entries'.
	     *
	     * Note that cancelled or absent booleans are stored as FALSE,
	     * unlike numbers and strings, whose cancelled/absent state is
	     * recorded in the terminfo database.
	     */
	    for (ep = &entries[1]; ep < entries + termcount; ep++)
		if (ep->tterm.Booleans[idx] == TRUE) {
		    is_set = entries[0].tterm.Booleans[idx];
		    break;
		}
	    if (is_set != entries[0].tterm.Booleans[idx])
		return (!is_set);
	    else
		return (FAIL);
	}

    case NUMBER:
	{
	    int value = ABSENT_NUMERIC;

	    /*
	     * We take the semantics of multiple uses to be 'each
	     * capability gets the first non-default value found
	     * in the sequence of use entries'.
	     */
	    for (ep = &entries[1]; ep < entries + termcount; ep++)
		if (VALID_NUMERIC(ep->tterm.Numbers[idx])) {
		    value = ep->tterm.Numbers[idx];
		    break;
		}

	    if (value != entries[0].tterm.Numbers[idx])
		return (value != ABSENT_NUMERIC);
	    else
		return (FAIL);
	}

    case STRING:
	{
	    char *termstr, *usestr = ABSENT_STRING;

	    termstr = entries[0].tterm.Strings[idx];

	    /*
	     * We take the semantics of multiple uses to be 'each
	     * capability gets the first non-default value found
	     * in the sequence of use entries'.
	     */
	    for (ep = &entries[1]; ep < entries + termcount; ep++)
		if (ep->tterm.Strings[idx]) {
		    usestr = ep->tterm.Strings[idx];
		    break;
		}

	    if (usestr == ABSENT_STRING && termstr == ABSENT_STRING)
		return (FAIL);
	    else if (!usestr || !termstr || capcmp(idx, usestr, termstr))
		return (TRUE);
	    else
		return (FAIL);
	}
    }

    return (FALSE);		/* pacify compiler */
}

static bool
useeq(ENTRY * e1, ENTRY * e2)
/* are the use references in two entries equivalent? */
{
    int i, j;

    if (e1->nuses != e2->nuses)
	return (FALSE);

    /* Ugh...this is quadratic again */
    for (i = 0; i < e1->nuses; i++) {
	bool foundmatch = FALSE;

	/* search second entry for given use reference */
	for (j = 0; j < e2->nuses; j++)
	    if (!strcmp(e1->uses[i].name, e2->uses[j].name)) {
		foundmatch = TRUE;
		break;
	    }

	if (!foundmatch)
	    return (FALSE);
    }

    return (TRUE);
}

static bool
entryeq(TERMTYPE * t1, TERMTYPE * t2)
/* are two entries equivalent? */
{
    int i;

    for (i = 0; i < NUM_BOOLEANS(t1); i++)
	if (t1->Booleans[i] != t2->Booleans[i])
	    return (FALSE);

    for (i = 0; i < NUM_NUMBERS(t1); i++)
	if (t1->Numbers[i] != t2->Numbers[i])
	    return (FALSE);

    for (i = 0; i < NUM_STRINGS(t1); i++)
	if (capcmp(i, t1->Strings[i], t2->Strings[i]))
	    return (FALSE);

    return (TRUE);
}

#define TIC_EXPAND(result) _nc_tic_expand(result, outform==F_TERMINFO, numbers)

static void
print_uses(ENTRY * ep, FILE * fp)
/* print an entry's use references */
{
    int i;

    if (!ep->nuses)
	fputs("NULL", fp);
    else
	for (i = 0; i < ep->nuses; i++) {
	    fputs(ep->uses[i].name, fp);
	    if (i < ep->nuses - 1)
		fputs(" ", fp);
	}
}

static const char *
dump_boolean(int val)
/* display the value of a boolean capability */
{
    switch (val) {
    case ABSENT_BOOLEAN:
	return (s_absent);
    case CANCELLED_BOOLEAN:
	return (s_cancel);
    case FALSE:
	return ("F");
    case TRUE:
	return ("T");
    default:
	return ("?");
    }
}

static void
dump_numeric(int val, char *buf, size_t bufl)
/* display the value of a boolean capability */
{
    switch (val) {
    case ABSENT_NUMERIC:
	strlcpy(buf, s_absent, bufl);
	break;
    case CANCELLED_NUMERIC:
	strlcpy(buf, s_cancel, bufl);
	break;
    default:
	snprintf(buf, bufl, "%d", val);
	break;
    }
}

static void
dump_string(char *val, char *buf, size_t bufl)
/* display the value of a string capability */
{
    if (val == ABSENT_STRING)
	strlcpy(buf, s_absent, bufl);
    else if (val == CANCELLED_STRING)
	strlcpy(buf, s_cancel, bufl);
    else {
	snprintf(buf, bufl, "'%.*s'", MAX_STRING - 3, TIC_EXPAND(val));
    }
}

static void
compare_predicate(int type, int idx, const char *name)
/* predicate function to use for entry difference reports */
{
    ENTRY *e1 = &entries[0];
    ENTRY *e2 = &entries[1];
    char buf1[MAX_STRING], buf2[MAX_STRING];
    int b1, b2;
    int n1, n2;
    char *s1, *s2;

    switch (type) {
    case CMP_BOOLEAN:
	b1 = e1->tterm.Booleans[idx];
	b2 = e2->tterm.Booleans[idx];
	switch (compare) {
	case C_DIFFERENCE:
	    if (!(b1 == ABSENT_BOOLEAN && b2 == ABSENT_BOOLEAN) && b1 != b2)
		(void) printf("\t%s: %s%s%s.\n",
			      name,
			      dump_boolean(b1),
			      bool_sep,
			      dump_boolean(b2));
	    break;

	case C_COMMON:
	    if (b1 == b2 && b1 != ABSENT_BOOLEAN)
		(void) printf("\t%s= %s.\n", name, dump_boolean(b1));
	    break;

	case C_NAND:
	    if (b1 == ABSENT_BOOLEAN && b2 == ABSENT_BOOLEAN)
		(void) printf("\t!%s.\n", name);
	    break;
	}
	break;

    case CMP_NUMBER:
	n1 = e1->tterm.Numbers[idx];
	n2 = e2->tterm.Numbers[idx];
	dump_numeric(n1, buf1, sizeof buf1);
	dump_numeric(n2, buf2, sizeof buf2);
	switch (compare) {
	case C_DIFFERENCE:
	    if (!((n1 == ABSENT_NUMERIC && n2 == ABSENT_NUMERIC)) && n1 != n2)
		(void) printf("\t%s: %s, %s.\n", name, buf1, buf2);
	    break;

	case C_COMMON:
	    if (n1 != ABSENT_NUMERIC && n2 != ABSENT_NUMERIC && n1 == n2)
		(void) printf("\t%s= %s.\n", name, buf1);
	    break;

	case C_NAND:
	    if (n1 == ABSENT_NUMERIC && n2 == ABSENT_NUMERIC)
		(void) printf("\t!%s.\n", name);
	    break;
	}
	break;

    case CMP_STRING:
	s1 = e1->tterm.Strings[idx];
	s2 = e2->tterm.Strings[idx];
	switch (compare) {
	case C_DIFFERENCE:
	    if (capcmp(idx, s1, s2)) {
		dump_string(s1, buf1, sizeof buf1);
		dump_string(s2, buf2, sizeof buf2);
		if (strcmp(buf1, buf2))
		    (void) printf("\t%s: %s, %s.\n", name, buf1, buf2);
	    }
	    break;

	case C_COMMON:
	    if (s1 && s2 && !capcmp(idx, s1, s2))
		(void) printf("\t%s= '%s'.\n", name, TIC_EXPAND(s1));
	    break;

	case C_NAND:
	    if (!s1 && !s2)
		(void) printf("\t!%s.\n", name);
	    break;
	}
	break;

    case CMP_USE:
	/* unlike the other modes, this compares *all* use entries */
	switch (compare) {
	case C_DIFFERENCE:
	    if (!useeq(e1, e2)) {
		(void) fputs("\tuse: ", stdout);
		print_uses(e1, stdout);
		fputs(", ", stdout);
		print_uses(e2, stdout);
		fputs(".\n", stdout);
	    }
	    break;

	case C_COMMON:
	    if (e1->nuses && e2->nuses && useeq(e1, e2)) {
		(void) fputs("\tuse: ", stdout);
		print_uses(e1, stdout);
		fputs(".\n", stdout);
	    }
	    break;

	case C_NAND:
	    if (!e1->nuses && !e2->nuses)
		(void) printf("\t!use.\n");
	    break;
	}
    }
}

/***************************************************************************
 *
 * Init string analysis
 *
 ***************************************************************************/

typedef struct {
    const char *from;
    const char *to;
} assoc;

static const assoc std_caps[] =
{
    /* these are specified by X.364 and iBCS2 */
    {"\033c", "RIS"},		/* full reset */
    {"\0337", "SC"},		/* save cursor */
    {"\0338", "RC"},		/* restore cursor */
    {"\033[r", "RSR"},		/* not an X.364 mnemonic */
    {"\033[m", "SGR0"},		/* not an X.364 mnemonic */
    {"\033[2J", "ED2"},		/* clear page */

    /* this group is specified by ISO 2022 */
    {"\033(0", "ISO DEC G0"},	/* enable DEC graphics for G0 */
    {"\033(A", "ISO UK G0"},	/* enable UK chars for G0 */
    {"\033(B", "ISO US G0"},	/* enable US chars for G0 */
    {"\033)0", "ISO DEC G1"},	/* enable DEC graphics for G1 */
    {"\033)A", "ISO UK G1"},	/* enable UK chars for G1 */
    {"\033)B", "ISO US G1"},	/* enable US chars for G1 */

    /* these are DEC private modes widely supported by emulators */
    {"\033=", "DECPAM"},	/* application keypad mode */
    {"\033>", "DECPNM"},	/* normal keypad mode */
    {"\033<", "DECANSI"},	/* enter ANSI mode */

    {(char *) 0, (char *) 0}
};

static const assoc private_modes[] =
/* DEC \E[ ... [hl] modes recognized by many emulators */
{
    {"1", "CKM"},		/* application cursor keys */
    {"2", "ANM"},		/* set VT52 mode */
    {"3", "COLM"},		/* 132-column mode */
    {"4", "SCLM"},		/* smooth scroll */
    {"5", "SCNM"},		/* reverse video mode */
    {"6", "OM"},		/* origin mode */
    {"7", "AWM"},		/* wraparound mode */
    {"8", "ARM"},		/* auto-repeat mode */
    {(char *) 0, (char *) 0}
};

static const assoc ecma_highlights[] =
/* recognize ECMA attribute sequences */
{
    {"0", "NORMAL"},		/* normal */
    {"1", "+BOLD"},		/* bold on */
    {"2", "+DIM"},		/* dim on */
    {"3", "+ITALIC"},		/* italic on */
    {"4", "+UNDERLINE"},	/* underline on */
    {"5", "+BLINK"},		/* blink on */
    {"6", "+FASTBLINK"},	/* fastblink on */
    {"7", "+REVERSE"},		/* reverse on */
    {"8", "+INVISIBLE"},	/* invisible on */
    {"9", "+DELETED"},		/* deleted on */
    {"10", "MAIN-FONT"},	/* select primary font */
    {"11", "ALT-FONT-1"},	/* select alternate font 1 */
    {"12", "ALT-FONT-2"},	/* select alternate font 2 */
    {"13", "ALT-FONT-3"},	/* select alternate font 3 */
    {"14", "ALT-FONT-4"},	/* select alternate font 4 */
    {"15", "ALT-FONT-5"},	/* select alternate font 5 */
    {"16", "ALT-FONT-6"},	/* select alternate font 6 */
    {"17", "ALT-FONT-7"},	/* select alternate font 7 */
    {"18", "ALT-FONT-1"},	/* select alternate font 1 */
    {"19", "ALT-FONT-1"},	/* select alternate font 1 */
    {"20", "FRAKTUR"},		/* Fraktur font */
    {"21", "DOUBLEUNDER"},	/* double underline */
    {"22", "-DIM"},		/* dim off */
    {"23", "-ITALIC"},		/* italic off */
    {"24", "-UNDERLINE"},	/* underline off */
    {"25", "-BLINK"},		/* blink off */
    {"26", "-FASTBLINK"},	/* fastblink off */
    {"27", "-REVERSE"},		/* reverse off */
    {"28", "-INVISIBLE"},	/* invisible off */
    {"29", "-DELETED"},		/* deleted off */
    {(char *) 0, (char *) 0}
};

static void
analyze_string(const char *name, const char *cap, TERMTYPE * tp)
{
    char buf[MAX_TERMINFO_LENGTH];
    char buf2[MAX_TERMINFO_LENGTH];
    const char *sp, *ep;
    const assoc *ap;

    if (cap == ABSENT_STRING || cap == CANCELLED_STRING)
	return;
    (void) printf("%s: ", name);

    buf[0] = '\0';
    for (sp = cap; *sp; sp++) {
	int i;
	size_t len = 0;
	const char *expansion = 0;

	/* first, check other capabilities in this entry */
	for (i = 0; i < STRCOUNT; i++) {
	    char *cp = tp->Strings[i];

	    /* don't use soft-key capabilities */
	    if (strnames[i][0] == 'k' && strnames[i][0] == 'f')
		continue;

	    if (cp != ABSENT_STRING && cp != CANCELLED_STRING && cp[0] && cp
		!= cap) {
		len = strlen(cp);
		(void) strncpy(buf2, sp, len);
		buf2[len] = '\0';

		if (_nc_capcmp(cp, buf2))
		    continue;

#define ISRS(s)	(!strncmp((s), "is", 2) || !strncmp((s), "rs", 2))
		/*
		 * Theoretically we just passed the test for translation
		 * (equality once the padding is stripped).  However, there
		 * are a few more hoops that need to be jumped so that
		 * identical pairs of initialization and reset strings
		 * don't just refer to each other.
		 */
		if (ISRS(name) || ISRS(strnames[i]))
		    if (cap < cp)
			continue;
#undef ISRS

		expansion = strnames[i];
		break;
	    }
	}

	/* now check the standard capabilities */
	if (!expansion)
	    for (ap = std_caps; ap->from; ap++) {
		len = strlen(ap->from);

		if (strncmp(ap->from, sp, len) == 0) {
		    expansion = ap->to;
		    break;
		}
	    }

	/* now check for private-mode sequences */
	if (!expansion
	    && sp[0] == '\033' && sp[1] == '[' && sp[2] == '?'
	    && (len = strspn(sp + 3, "0123456789;"))
	    && ((sp[3 + len] == 'h') || (sp[3 + len] == 'l'))) {
	    char buf3[MAX_TERMINFO_LENGTH];

	    (void) strlcpy(buf2, (sp[3 + len] == 'h') ? "DEC+" : "DEC-",
		sizeof buf2);
	    (void) strncpy(buf3, sp + 3, len);
	    len += 4;
	    buf3[len] = '\0';

	    ep = strtok(buf3, ";");
	    do {
		bool found = FALSE;

		for (ap = private_modes; ap->from; ap++) {
		    size_t tlen = strlen(ap->from);

		    if (strncmp(ap->from, ep, tlen) == 0) {
			(void) strlcat(buf2, ap->to, sizeof buf2);
			found = TRUE;
			break;
		    }
		}

		if (!found)
		    (void) strlcat(buf2, ep, sizeof buf2);
		(void) strlcat(buf2, ";", sizeof buf2);
	    } while
		((ep = strtok((char *) 0, ";")));
	    buf2[strlen(buf2) - 1] = '\0';
	    expansion = buf2;
	}

	/* now check for ECMA highlight sequences */
	if (!expansion
	    && sp[0] == '\033' && sp[1] == '['
	    && (len = strspn(sp + 2, "0123456789;"))
	    && sp[2 + len] == 'm') {
	    char buf3[MAX_TERMINFO_LENGTH];

	    (void) strlcpy(buf2, "SGR:", sizeof buf2);
	    (void) strncpy(buf3, sp + 2, len);
	    len += 3;
	    buf3[len] = '\0';

	    ep = strtok(buf3, ";");
	    do {
		bool found = FALSE;

		for (ap = ecma_highlights; ap->from; ap++) {
		    size_t tlen = strlen(ap->from);

		    if (strncmp(ap->from, ep, tlen) == 0) {
			(void) strlcat(buf2, ap->to, sizeof buf2);
			found = TRUE;
			break;
		    }
		}

		if (!found)
		    (void) strlcat(buf2, ep, sizeof buf2);
		(void) strlcat(buf2, ";", sizeof buf2);
	    } while
		((ep = strtok((char *) 0, ";")));

	    buf2[strlen(buf2) - 1] = '\0';
	    expansion = buf2;
	}
	/* now check for scroll region reset */
	if (!expansion) {
	    (void) snprintf(buf2, sizeof buf2, "\033[1;%dr", tp->Numbers[2]);
	    len = strlen(buf2);
	    if (strncmp(buf2, sp, len) == 0)
		expansion = "RSR";
	}

	/* now check for home-down */
	if (!expansion) {
	    (void) snprintf(buf2, sizeof buf2, "\033[%d;1H", tp->Numbers[2]);
	    len = strlen(buf2);
	    if (strncmp(buf2, sp, len) == 0)
		expansion = "LL";
	}

	/* now look at the expansion we got, if any */
	if (expansion) {
	    (void) snprintf(buf + strlen(buf), sizeof buf - strlen(buf),
		"{%s}", expansion);
	    sp += len - 1;
	    continue;
	} else {
	    /* couldn't match anything */
	    buf2[0] = *sp;
	    buf2[1] = '\0';
	    (void) strlcat(buf, TIC_EXPAND(buf2), sizeof buf);
	}
    }
    (void) printf("%s\n", buf);
}

/***************************************************************************
 *
 * File comparison
 *
 ***************************************************************************/

static void
file_comparison(int argc, char *argv[])
{
#define MAXCOMPARE	2
    /* someday we may allow comparisons on more files */
    int filecount = 0;
    ENTRY *heads[MAXCOMPARE];
    ENTRY *qp, *rp;
    int i, n;

    dump_init((char *) 0, F_LITERAL, S_TERMINFO, 0, itrace, FALSE);

    for (n = 0; n < argc && n < MAXCOMPARE; n++) {
	if (freopen(argv[n], "r", stdin) == 0)
	    _nc_err_abort("Can't open %s", argv[n]);

	_nc_head = _nc_tail = 0;

	/* parse entries out of the source file */
	_nc_set_source(argv[n]);
	_nc_read_entry_source(stdin, NULL, TRUE, FALSE, NULLHOOK);

	if (itrace)
	    (void) fprintf(stderr, "Resolving file %d...\n", n - 0);

	/* maybe do use resolution */
	if (!_nc_resolve_uses(!limited)) {
	    (void) fprintf(stderr,
			   "There are unresolved use entries in %s:\n",
			   argv[n]);
	    for_entry_list(qp) {
		if (qp->nuses) {
		    (void) fputs(qp->tterm.term_names, stderr);
		    (void) fputc('\n', stderr);
		}
	    }
	    exit(EXIT_FAILURE);
	}

	heads[filecount] = _nc_head;
	filecount++;
    }

    /* OK, all entries are in core.  Ready to do the comparison */
    if (itrace)
	(void) fprintf(stderr, "Entries are now in core...\n");

    /* The entry-matching loop. Sigh, this is intrinsically quadratic. */
    for (qp = heads[0]; qp; qp = qp->next) {
	for (rp = heads[1]; rp; rp = rp->next)
	    if (_nc_entry_match(qp->tterm.term_names, rp->tterm.term_names)) {
		if (qp->ncrosslinks < MAX_CROSSLINKS)
		    qp->crosslinks[qp->ncrosslinks] = rp;
		qp->ncrosslinks++;

		if (rp->ncrosslinks < MAX_CROSSLINKS)
		    rp->crosslinks[rp->ncrosslinks] = qp;
		rp->ncrosslinks++;
	    }
    }

    /* now we have two circular lists with crosslinks */
    if (itrace)
	(void) fprintf(stderr, "Name matches are done...\n");

    for (qp = heads[0]; qp; qp = qp->next) {
	if (qp->ncrosslinks > 1) {
	    (void) fprintf(stderr,
			   "%s in file 1 (%s) has %d matches in file 2 (%s):\n",
			   _nc_first_name(qp->tterm.term_names),
			   argv[0],
			   qp->ncrosslinks,
			   argv[1]);
	    for (i = 0; i < qp->ncrosslinks; i++)
		(void) fprintf(stderr,
			       "\t%s\n",
			       _nc_first_name((qp->crosslinks[i])->tterm.term_names));
	}
    }

    for (rp = heads[1]; rp; rp = rp->next) {
	if (rp->ncrosslinks > 1) {
	    (void) fprintf(stderr,
			   "%s in file 2 (%s) has %d matches in file 1 (%s):\n",
			   _nc_first_name(rp->tterm.term_names),
			   argv[1],
			   rp->ncrosslinks,
			   argv[0]);
	    for (i = 0; i < rp->ncrosslinks; i++)
		(void) fprintf(stderr,
			       "\t%s\n",
			       _nc_first_name((rp->crosslinks[i])->tterm.term_names));
	}
    }

    (void) printf("In file 1 (%s) only:\n", argv[0]);
    for (qp = heads[0]; qp; qp = qp->next)
	if (qp->ncrosslinks == 0)
	    (void) printf("\t%s\n",
			  _nc_first_name(qp->tterm.term_names));

    (void) printf("In file 2 (%s) only:\n", argv[1]);
    for (rp = heads[1]; rp; rp = rp->next)
	if (rp->ncrosslinks == 0)
	    (void) printf("\t%s\n",
			  _nc_first_name(rp->tterm.term_names));

    (void) printf("The following entries are equivalent:\n");
    for (qp = heads[0]; qp; qp = qp->next) {
	rp = qp->crosslinks[0];

	if (qp->ncrosslinks == 1) {
	    rp = qp->crosslinks[0];

	    repair_acsc(&qp->tterm);
	    repair_acsc(&rp->tterm);
#if NCURSES_XNAMES
	    _nc_align_termtype(&qp->tterm, &rp->tterm);
#endif
	    if (entryeq(&qp->tterm, &rp->tterm) && useeq(qp, rp)) {
		char name1[NAMESIZE], name2[NAMESIZE];

		(void) canonical_name(qp->tterm.term_names, name1, sizeof name1);
		(void) canonical_name(rp->tterm.term_names, name2, sizeof name2);

		(void) printf("%s = %s\n", name1, name2);
	    }
	}
    }

    (void) printf("Differing entries:\n");
    termcount = 2;
    for (qp = heads[0]; qp; qp = qp->next) {

	if (qp->ncrosslinks == 1) {
	    rp = qp->crosslinks[0];
#if NCURSES_XNAMES
	    /* sorry - we have to do this on each pass */
	    _nc_align_termtype(&qp->tterm, &rp->tterm);
#endif
	    if (!(entryeq(&qp->tterm, &rp->tterm) && useeq(qp, rp))) {
		char name1[NAMESIZE], name2[NAMESIZE];

		entries[0] = *qp;
		entries[1] = *rp;

		(void) canonical_name(qp->tterm.term_names, name1, sizeof name1);
		(void) canonical_name(rp->tterm.term_names, name2, sizeof name2);

		switch (compare) {
		case C_DIFFERENCE:
		    if (itrace)
			(void) fprintf(stderr,
				       "infocmp: dumping differences\n");
		    (void) printf("comparing %s to %s.\n", name1, name2);
		    compare_entry(compare_predicate, &entries->tterm, quiet);
		    break;

		case C_COMMON:
		    if (itrace)
			(void) fprintf(stderr,
				       "infocmp: dumping common capabilities\n");
		    (void) printf("comparing %s to %s.\n", name1, name2);
		    compare_entry(compare_predicate, &entries->tterm, quiet);
		    break;

		case C_NAND:
		    if (itrace)
			(void) fprintf(stderr,
				       "infocmp: dumping differences\n");
		    (void) printf("comparing %s to %s.\n", name1, name2);
		    compare_entry(compare_predicate, &entries->tterm, quiet);
		    break;

		}
	    }
	}
    }
}

static void
usage(void)
{
    static const char *tbl[] =
    {
	"Usage: infocmp [options] [-A directory] [-B directory] [termname...]"
	,""
	,"Options:"
	,"  -1    print single-column"
	,"  -C    use termcap-names"
	,"  -F    compare terminfo-files"
	,"  -I    use terminfo-names"
	,"  -L    use long names"
	,"  -R subset (see manpage)"
	,"  -T    eliminate size limits (test)"
	,"  -V    print version"
#if NCURSES_XNAMES
	,"  -a    with -F, list commented-out caps"
#endif
	,"  -c    list common capabilities"
	,"  -d    list different capabilities"
	,"  -e    format output for C initializer"
	,"  -E    format output as C tables"
	,"  -f    with -1, format complex strings"
	,"  -G    format %{number} to %'char'"
	,"  -g    format %'char' to %{number}"
	,"  -i    analyze initialization/reset"
	,"  -l    output terminfo names"
	,"  -n    list capabilities in neither"
	,"  -p    ignore padding specifiers"
	,"  -q    brief listing, removes headers"
	,"  -r    with -C, output in termcap form"
	,"  -r    with -F, resolve use-references"
	,"  -s [d|i|l|c] sort fields"
	,"  -u    produce source with 'use='"
	,"  -v number  (verbose)"
	,"  -w number  (width)"
    };
    const size_t first = 3;
    const size_t last = SIZEOF(tbl);
    const size_t left = (last - first + 1) / 2 + first;
    size_t n;

    for (n = 0; n < left; n++) {
	size_t m = (n < first) ? last : n + left - first;
	if (m < last)
	    fprintf(stderr, "%-40.40s%s\n", tbl[n], tbl[m]);
	else
	    fprintf(stderr, "%s\n", tbl[n]);
    }
    exit(EXIT_FAILURE);
}

static char *
name_initializer(const char *type)
{
    static char *initializer;
    static size_t len;
    char *s;

    if (initializer == 0) {
	len = strlen(entries->tterm.term_names) + 20;
	initializer = (char *) malloc(len);
    }

    (void) snprintf(initializer, len, "%s_data_%s", type, entries->tterm.term_names);
    for (s = initializer; *s != 0 && *s != '|'; s++) {
	if (!isalnum(CharOf(*s)))
	    *s = '_';
    }
    *s = 0;
    return initializer;
}

/* dump C initializers for the terminal type */
static void
dump_initializers(TERMTYPE * term)
{
    int n;
    const char *str = 0;
    int size;

    (void) printf("static char %s[] = %s\n", name_initializer("bool"), L_CURL);

    for_each_boolean(n, term) {
	switch ((int) (term->Booleans[n])) {
	case TRUE:
	    str = "TRUE";
	    break;

	case FALSE:
	    str = "FALSE";
	    break;

	case ABSENT_BOOLEAN:
	    str = "ABSENT_BOOLEAN";
	    break;

	case CANCELLED_BOOLEAN:
	    str = "CANCELLED_BOOLEAN";
	    break;
	}
	(void) printf("\t/* %3d: %-8s */\t%s,\n",
		      n, ExtBoolname(term, n, boolnames), str);
    }
    (void) printf("%s;\n", R_CURL);

    (void) printf("static short %s[] = %s\n", name_initializer("number"), L_CURL);

    for_each_number(n, term) {
	char buf[BUFSIZ];
	switch (term->Numbers[n]) {
	case ABSENT_NUMERIC:
	    str = "ABSENT_NUMERIC";
	    break;
	case CANCELLED_NUMERIC:
	    str = "CANCELLED_NUMERIC";
	    break;
	default:
	    snprintf(buf, sizeof buf, "%d", term->Numbers[n]);
	    str = buf;
	    break;
	}
	(void) printf("\t/* %3d: %-8s */\t%s,\n", n,
		      ExtNumname(term, n, numnames), str);
    }
    (void) printf("%s;\n", R_CURL);

    size = sizeof(TERMTYPE)
	+ (NUM_BOOLEANS(term) * sizeof(term->Booleans[0]))
	+ (NUM_NUMBERS(term) * sizeof(term->Numbers[0]));

    (void) printf("static char * %s[] = %s\n", name_initializer("string"), L_CURL);

    for_each_string(n, term) {
	char buf[MAX_STRING], *sp, *tp;

	if (term->Strings[n] == ABSENT_STRING)
	    str = "ABSENT_STRING";
	else if (term->Strings[n] == CANCELLED_STRING)
	    str = "CANCELLED_STRING";
	else {
	    tp = buf;
	    *tp++ = '"';
	    for (sp = term->Strings[n];
		 *sp != 0 && (tp - buf) < MAX_STRING - 6;
		 sp++) {
		if (isascii(CharOf(*sp))
		    && isprint(CharOf(*sp))
		    && *sp != '\\'
		    && *sp != '"')
		    *tp++ = *sp;
		else {
		    (void) snprintf(tp, buf + sizeof buf - tp, "\\%03o", CharOf(*sp));
		    tp += 4;
		}
	    }
	    *tp++ = '"';
	    *tp = '\0';
	    size += (strlen(term->Strings[n]) + 1);
	    str = buf;
	}
#if NCURSES_XNAMES
	if (n == STRCOUNT) {
	    (void) printf("%s;\n", R_CURL);

	    (void) printf("static char * %s[] = %s\n",
			  name_initializer("string_ext"), L_CURL);
	}
#endif
	(void) printf("\t/* %3d: %-8s */\t%s,\n", n,
		      ExtStrname(term, n, strnames), str);
    }
    (void) printf("%s;\n", R_CURL);
}

/* dump C initializers for the terminal type */
static void
dump_termtype(TERMTYPE * term)
{
    (void) printf("\t%s\n\t\t\"%s\",\n", L_CURL, term->term_names);
    (void) printf("\t\t(char *)0,\t/* pointer to string table */\n");

    (void) printf("\t\t%s,\n", name_initializer("bool"));
    (void) printf("\t\t%s,\n", name_initializer("number"));

    (void) printf("\t\t%s,\n", name_initializer("string"));

#if NCURSES_XNAMES
    (void) printf("#if NCURSES_XNAMES\n");
    (void) printf("\t\t(char *)0,\t/* pointer to extended string table */\n");
    (void) printf("\t\t%s,\t/* ...corresponding names */\n",
		  (NUM_STRINGS(term) != STRCOUNT)
		  ? name_initializer("string_ext")
		  : "(char **)0");

    (void) printf("\t\t%d,\t\t/* count total Booleans */\n", NUM_BOOLEANS(term));
    (void) printf("\t\t%d,\t\t/* count total Numbers */\n", NUM_NUMBERS(term));
    (void) printf("\t\t%d,\t\t/* count total Strings */\n", NUM_STRINGS(term));

    (void) printf("\t\t%d,\t\t/* count extensions to Booleans */\n",
		  NUM_BOOLEANS(term) - BOOLCOUNT);
    (void) printf("\t\t%d,\t\t/* count extensions to Numbers */\n",
		  NUM_NUMBERS(term) - NUMCOUNT);
    (void) printf("\t\t%d,\t\t/* count extensions to Strings */\n",
		  NUM_STRINGS(term) - STRCOUNT);

    (void) printf("#endif /* NCURSES_XNAMES */\n");
#endif /* NCURSES_XNAMES */
    (void) printf("\t%s\n", R_CURL);
}

static int
optarg_to_number(void)
{
    char *temp = 0;
    long value = strtol(optarg, &temp, 0);

    if (temp == 0 || temp == optarg || *temp != 0) {
	fprintf(stderr, "Expected a number, not \"%s\"\n", optarg);
	exit(EXIT_FAILURE);
    }
    return (int) value;
}

/***************************************************************************
 *
 * Main sequence
 *
 ***************************************************************************/

int
main(int argc, char *argv[])
{
    char *terminal, *firstdir, *restdir;
    /* Avoid "local data >32k" error with mwcc */
    /* Also avoid overflowing smaller stacks on systems like AmigaOS */
    size_t tlen = sizeof(path) * MAXTERMS;
    path *tfile = (path *) malloc(tlen);
    int c, i, len;
    bool formatted = FALSE;
    bool filecompare = FALSE;
    int initdump = 0;
    bool init_analyze = FALSE;

    if ((terminal = getenv("TERM")) == 0) {
	(void) fprintf(stderr,
		       "infocmp: environment variable TERM not set\n");
	return EXIT_FAILURE;
    }

    /* where is the terminfo database location going to default to? */
    restdir = firstdir = 0;

    while ((c = getopt(argc, argv, "adeEcCfFGgIinlLpqrR:s:uv:Vw:A:B:1T")) != -1)
	switch (c) {
#if NCURSES_XNAMES
	case 'a':
	    _nc_disable_period = TRUE;
	    use_extended_names(TRUE);
	    break;
#endif
	case 'd':
	    compare = C_DIFFERENCE;
	    break;

	case 'e':
	    initdump |= 1;
	    break;

	case 'E':
	    initdump |= 2;
	    break;

	case 'c':
	    compare = C_COMMON;
	    break;

	case 'C':
	    outform = F_TERMCAP;
	    tversion = "BSD";
	    if (sortmode == S_DEFAULT)
		sortmode = S_TERMCAP;
	    break;

	case 'f':
	    formatted = TRUE;
	    break;

	case 'G':
	    numbers = 1;
	    break;

	case 'g':
	    numbers = -1;
	    break;

	case 'F':
	    filecompare = TRUE;
	    break;

	case 'I':
	    outform = F_TERMINFO;
	    if (sortmode == S_DEFAULT)
		sortmode = S_VARIABLE;
	    tversion = 0;
	    break;

	case 'i':
	    init_analyze = TRUE;
	    break;

	case 'l':
	    outform = F_TERMINFO;
	    break;

	case 'L':
	    outform = F_VARIABLE;
	    if (sortmode == S_DEFAULT)
		sortmode = S_VARIABLE;
	    break;

	case 'n':
	    compare = C_NAND;
	    break;

	case 'p':
	    ignorepads = TRUE;
	    break;

	case 'q':
	    quiet = TRUE;
	    s_absent = "-";
	    s_cancel = "@";
	    bool_sep = ", ";
	    break;

	case 'r':
	    tversion = 0;
	    limited = FALSE;
	    break;

	case 'R':
	    tversion = optarg;
	    break;

	case 's':
	    if (*optarg == 'd')
		sortmode = S_NOSORT;
	    else if (*optarg == 'i')
		sortmode = S_TERMINFO;
	    else if (*optarg == 'l')
		sortmode = S_VARIABLE;
	    else if (*optarg == 'c')
		sortmode = S_TERMCAP;
	    else {
		(void) fprintf(stderr,
			       "infocmp: unknown sort mode\n");
		return EXIT_FAILURE;
	    }
	    break;

	case 'u':
	    compare = C_USEALL;
	    break;

	case 'v':
	    itrace = optarg_to_number();
	    set_trace_level(itrace);
	    break;

	case 'V':
	    puts(curses_version());
	    ExitProgram(EXIT_SUCCESS);

	case 'w':
	    mwidth = optarg_to_number();
	    break;

	case 'A':
	    firstdir = optarg;
	    break;

	case 'B':
	    restdir = optarg;
	    break;

	case '1':
	    mwidth = 0;
	    break;

	case 'T':
	    limited = FALSE;
	    break;
	default:
	    usage();
	}

    /* by default, sort by terminfo name */
    if (sortmode == S_DEFAULT)
	sortmode = S_TERMINFO;

    /* set up for display */
    dump_init(tversion, outform, sortmode, mwidth, itrace, formatted);

    /* make sure we have at least one terminal name to work with */
    if (optind >= argc)
	argv[argc++] = terminal;

    /* if user is after a comparison, make sure we have two entries */
    if (compare != C_DEFAULT && optind >= argc - 1)
	argv[argc++] = terminal;

    /* exactly two terminal names with no options means do -d */
    if (argc - optind == 2 && compare == C_DEFAULT)
	compare = C_DIFFERENCE;

    if (!filecompare) {
	/* grab the entries */
	termcount = 0;
	for (; optind < argc; optind++) {
	    if (termcount >= MAXTERMS) {
		(void) fprintf(stderr,
			       "infocmp: too many terminal type arguments\n");
		return EXIT_FAILURE;
	    } else {
		const char *directory = termcount ? restdir : firstdir;
		int status;

		tname[termcount] = argv[optind];

		if (directory) {
		    (void) snprintf(tfile[termcount],
				    tlen - termcount,
				   "%s/%c/%s",
				   directory,
				   *argv[optind], argv[optind]);
		    if (itrace)
			(void) fprintf(stderr,
				       "infocmp: reading entry %s from file %s\n",
				       argv[optind], tfile[termcount]);

		    status = _nc_read_file_entry(tfile[termcount],
						 &entries[termcount].tterm);
		} else {
		    if (itrace)
			(void) fprintf(stderr,
				       "infocmp: reading entry %s from system directories %s\n",
				       argv[optind], tname[termcount]);

		    status = _nc_read_entry(tname[termcount],
					    tfile[termcount],
					    &entries[termcount].tterm);
		    directory = TERMINFO;	/* for error message */
		}

		if (status <= 0) {
		    (void) fprintf(stderr,
				   "infocmp: couldn't open terminfo file %s.\n",
				   tfile[termcount]);
		    return EXIT_FAILURE;
		}
		repair_acsc(&entries[termcount].tterm);
		termcount++;
	    }
	}

#if NCURSES_XNAMES
	if (termcount > 1)
	    _nc_align_termtype(&entries[0].tterm, &entries[1].tterm);
#endif

	/* dump as C initializer for the terminal type */
	if (initdump) {
	    if (initdump & 1)
		dump_termtype(&entries[0].tterm);
	    if (initdump & 2)
		dump_initializers(&entries[0].tterm);
	    ExitProgram(EXIT_SUCCESS);
	}

	/* analyze the init strings */
	if (init_analyze) {
#undef CUR
#define CUR	entries[0].tterm.
	    analyze_string("is1", init_1string, &entries[0].tterm);
	    analyze_string("is2", init_2string, &entries[0].tterm);
	    analyze_string("is3", init_3string, &entries[0].tterm);
	    analyze_string("rs1", reset_1string, &entries[0].tterm);
	    analyze_string("rs2", reset_2string, &entries[0].tterm);
	    analyze_string("rs3", reset_3string, &entries[0].tterm);
	    analyze_string("smcup", enter_ca_mode, &entries[0].tterm);
	    analyze_string("rmcup", exit_ca_mode, &entries[0].tterm);
#undef CUR
	    ExitProgram(EXIT_SUCCESS);
	}

	/*
	 * Here's where the real work gets done
	 */
	switch (compare) {
	case C_DEFAULT:
	    if (itrace)
		(void) fprintf(stderr,
			       "infocmp: about to dump %s\n",
			       tname[0]);
	    (void) printf("#\tReconstructed via infocmp from file: %s\n",
			  tfile[0]);
	    len = dump_entry(&entries[0].tterm, limited, numbers, NULL);
	    putchar('\n');
	    if (itrace)
		(void) fprintf(stderr, "infocmp: length %d\n", len);
	    break;

	case C_DIFFERENCE:
	    if (itrace)
		(void) fprintf(stderr, "infocmp: dumping differences\n");
	    (void) printf("comparing %s to %s.\n", tname[0], tname[1]);
	    compare_entry(compare_predicate, &entries->tterm, quiet);
	    break;

	case C_COMMON:
	    if (itrace)
		(void) fprintf(stderr,
			       "infocmp: dumping common capabilities\n");
	    (void) printf("comparing %s to %s.\n", tname[0], tname[1]);
	    compare_entry(compare_predicate, &entries->tterm, quiet);
	    break;

	case C_NAND:
	    if (itrace)
		(void) fprintf(stderr,
			       "infocmp: dumping differences\n");
	    (void) printf("comparing %s to %s.\n", tname[0], tname[1]);
	    compare_entry(compare_predicate, &entries->tterm, quiet);
	    break;

	case C_USEALL:
	    if (itrace)
		(void) fprintf(stderr, "infocmp: dumping use entry\n");
	    len = dump_entry(&entries[0].tterm, limited, numbers, use_predicate);
	    for (i = 1; i < termcount; i++)
		len += dump_uses(tname[i], !(outform == F_TERMCAP || outform
					     == F_TCONVERR));
	    putchar('\n');
	    if (itrace)
		(void) fprintf(stderr, "infocmp: length %d\n", len);
	    break;
	}
    } else if (compare == C_USEALL)
	(void) fprintf(stderr, "Sorry, -u doesn't work with -F\n");
    else if (compare == C_DEFAULT)
	(void) fprintf(stderr, "Use `tic -[CI] <file>' for this.\n");
    else if (argc - optind != 2)
	(void) fprintf(stderr,
		       "File comparison needs exactly two file arguments.\n");
    else
	file_comparison(argc - optind, argv + optind);

    ExitProgram(EXIT_SUCCESS);
}

/* infocmp.c ends here */