/*      $NetBSD: mkheaders.c,v 1.31 2026/03/13 21:13:46 andvar Exp $    */

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * 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, Lawrence Berkeley Laboratories.
 *
 * 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.
 *
 *      from: @(#)mkheaders.c   8.1 (Berkeley) 6/6/93
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
__RCSID("$NetBSD: mkheaders.c,v 1.31 2026/03/13 21:13:46 andvar Exp $");

#include <sys/param.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <util.h>
#include <err.h>
#include "defs.h"

#include <crc_extern.h>

static int emitcnt(struct nvlist *);
static int emitopts(void);
static int emittime(void);
static int herr(const char *, const char *, FILE *);
static int defopts_print(const char *, struct defoptlist *, void *);
static char *cntname(const char *);

/*
 * We define a global symbol with the name of each option and its value.
 * This should stop code compiled with different options being linked together.
 */

/* Unlikely constant for undefined options */
#define UNDEFINED ('n' << 24 | 0 << 20 | 't' << 12 | 0xdefU)
/* Value for defined options with value UNDEFINED */
#define DEFINED (0xdef1U << 16 | 'n' << 8 | 0xed)

/*
 * Make the various config-generated header files.
 */
int
mkheaders(void)
{
        struct files *fi;

        /*
         * Make headers containing counts, as needed.
         */
        TAILQ_FOREACH(fi, &allfiles, fi_next) {
                if (fi->fi_flags & FI_HIDDEN)
                        continue;
                if (fi->fi_flags & (FI_NEEDSCOUNT | FI_NEEDSFLAG) &&
                    emitcnt(fi->fi_optf))
                        return (1);
        }

        if (emitopts() || emitlocs() || emitioconfh())
                return (1);

        /*
         * If the minimum required version is ever bumped beyond 20090513,
         * emittime() can be removed.
         */
        if (version <= 20090513 && emittime())
                return (1);

        return (0);
}

static void
fprint_global(FILE *fp, const char *name, long long value)
{
        /*
         * We have to doubt the founding fathers here.
         * The gas syntax for hppa is 'var .equ value', for all? other
         * instruction sets it is ' .equ var,value'.  both have been used in
         * various assemblers, but supporting a common syntax would be good.
         * Fortunately we can use .equiv since it has a consistent syntax,
         * but requires us to detect multiple assignments - event with the
         * same value.
         */
        fprintf(fp, "#ifdef _LOCORE\n"
            " .ifndef _KERNEL_OPT_%s\n"
            " .global _KERNEL_OPT_%s\n"
            " .equiv _KERNEL_OPT_%s,0x%llx\n"
            " .endif\n"
            "#else\n"
            "__asm(\" .ifndef _KERNEL_OPT_%s\\n"
            " .global _KERNEL_OPT_%s\\n"
            " .equiv _KERNEL_OPT_%s,0x%llx\\n"
            " .endif\");\n"
            "#endif\n",
            name, name, name, value,
            name, name, name, value);
}

/* Convert the option argument to a 32bit number */
static unsigned int
global_hash(const char *str)
{
        unsigned long h;
        char *ep;

        /*
         * If the value is a valid numeric, just use it
         * We don't care about negative values here, we
         * just use the value as a hash.
         */
        h = strtoul(str, &ep, 0);
        if (*ep != 0)
                /* Otherwise shove through a 32bit CRC function */
                h = crc_buf(0, str, strlen(str));

        /* Avoid colliding with the value used for undefined options. */
        /* At least until I stop any options being set to zero */
        return (unsigned int)(h != UNDEFINED ? h : DEFINED);
}

static void
fprintcnt(FILE *fp, struct nvlist *nv)
{
        const char *name = cntname(nv->nv_name);

        fprintf(fp, "#define\t%s\t%lld\n", name, nv->nv_num);
        fprint_global(fp, name, nv->nv_num);
}

static int
emitcnt(struct nvlist *head)
{
        char nfname[BUFSIZ], tfname[BUFSIZ];
        struct nvlist *nv;
        FILE *fp;

        (void)snprintf(nfname, sizeof(nfname), "%s.h", head->nv_name);
        (void)snprintf(tfname, sizeof(tfname), "tmp_%s", nfname);

        if ((fp = fopen(tfname, "w")) == NULL)
                return (herr("open", tfname, NULL));

        for (nv = head; nv != NULL; nv = nv->nv_next)
                fprintcnt(fp, nv);

        fflush(fp);
        if (ferror(fp))
                return herr("writ", tfname, fp);

        if (fclose(fp) == EOF)
                return (herr("clos", tfname, NULL));

        return (moveifchanged(tfname, nfname));
}

/*
 * Output a string, preceded by a tab and possibly unescaping any quotes.
 * The argument will be output as is if it doesn't start with \".
 * Otherwise the first backslash in a \? sequence will be dropped.
 */
static void
fprintstr(FILE *fp, const char *str)
{

        if (strncmp(str, "\\\"", 2) != 0) {
                (void)fprintf(fp, "\t%s", str);
                return;
        }

        (void)fputc('\t', fp);

        for (; *str; str++) {
                switch (*str) {
                case '\\':
                        if (!*++str)                            /* XXX */
                                str--;
                        /*FALLTHROUGH*/
                default:
                        (void)fputc(*str, fp);
                        break;
                }
        }
}

/*
 * Callback function for walking the option file hash table.  We write out
 * the options defined for this file.
 */
static int
/*ARGSUSED*/
defopts_print(const char *name, struct defoptlist *value, void *arg)
{
        char tfname[BUFSIZ];
        struct nvlist *option;
        struct defoptlist *dl;
        const char *opt_value;
        int isfsoption;
        FILE *fp;

        (void)snprintf(tfname, sizeof(tfname), "tmp_%s", name);
        if ((fp = fopen(tfname, "w")) == NULL)
                return (herr("open", tfname, NULL));

        for (dl = value; dl != NULL; dl = dl->dl_next) {
                isfsoption = OPT_FSOPT(dl->dl_name);

                if (dl->dl_obsolete) {
                        fprintf(fp, "/* %s `%s' is obsolete */\n",
                            isfsoption ? "file system" : "option",
                            dl->dl_name);
                        fprint_global(fp, dl->dl_name, 0xdeadbeef);
                        continue;
                }

                if (((option = ht_lookup(opttab, dl->dl_name)) == NULL &&
                    (option = ht_lookup(fsopttab, dl->dl_name)) == NULL) &&
                    (dl->dl_value == NULL)) {
                        fprintf(fp, "/* %s `%s' not defined */\n",
                            isfsoption ? "file system" : "option",
                            dl->dl_name);
                        fprint_global(fp, dl->dl_name, UNDEFINED);
                        continue;
                }

                opt_value = option != NULL ? option->nv_str : dl->dl_value;
                if (isfsoption == 1)
                        /* For filesysteme we'd output the lower case name */
                        opt_value = NULL;

                fprintf(fp, "#define\t%s", dl->dl_name);
                if (opt_value != NULL)
                        fprintstr(fp, opt_value);
                else if (!isfsoption)
                        fprintstr(fp, "1");
                fputc('\n', fp);
                fprint_global(fp, dl->dl_name,
                    opt_value == NULL ? 1 : global_hash(opt_value));
        }

        fflush(fp);
        if (ferror(fp))
                return herr("writ", tfname, fp);

        if (fclose(fp) == EOF)
                return (herr("clos", tfname, NULL));

        return (moveifchanged(tfname, name));
}

/*
 * Emit the option header files.
 */
static int
emitopts(void)
{

        return (dlhash_enumerate(optfiletab, defopts_print, NULL));
}

/*
 * A callback function for walking the attribute hash table.
 * Emit CPP definitions of manifest constants for the locators on the
 * "name" attribute node (passed as the "value" parameter).
 */
static int
locators_print(const char *name, void *value, void *arg)
{
        struct attr *a;
        struct loclist *ll;
        int i;
        char *locdup, *namedup;
        char *cp;
        FILE *fp = arg;

        a = value;
        if (a->a_locs) {
                if (strchr(name, ' ') != NULL || strchr(name, '\t') != NULL)
                        /*
                         * name contains a space; we can't generate
                         * usable defines, so ignore it.
                         */
                        return 0;
                locdup = estrdup(name);
                for (cp = locdup; *cp; cp++)
                        if (islower((unsigned char)*cp))
                                *cp = (char)toupper((unsigned char)*cp);
                for (i = 0, ll = a->a_locs; ll; ll = ll->ll_next, i++) {
                        if (strchr(ll->ll_name, ' ') != NULL ||
                            strchr(ll->ll_name, '\t') != NULL)
                                /*
                                 * name contains a space; we can't generate
                                 * usable defines, so ignore it.
                                 */
                                continue;
                        namedup = estrdup(ll->ll_name);
                        for (cp = namedup; *cp; cp++)
                                if (islower((unsigned char)*cp))
                                        *cp = (char)toupper((unsigned char)*cp);
                                else if (*cp == ARRCHR)
                                        *cp = '_';
                        fprintf(fp, "#define %sCF_%s %d\n", locdup, namedup, i);
                        if (ll->ll_string != NULL)
                                fprintf(fp, "#define %sCF_%s_DEFAULT %s\n",
                                    locdup, namedup, ll->ll_string);
                        free(namedup);
                }
                /* assert(i == a->a_loclen) */
                fprintf(fp, "#define %sCF_NLOCS %d\n", locdup, a->a_loclen);
                free(locdup);
        }
        return 0;
}

/*
 * Build the "locators.h" file with manifest constants for all potential
 * locators in the configuration.  Do this by enumerating the attribute
 * hash table and emitting all the locators for each attribute.
 */
int
emitlocs(void)
{
        const char *tfname;
        int rval;
        FILE *tfp;

        tfname = "tmp_locators.h";
        if ((tfp = fopen(tfname, "w")) == NULL)
                return (herr("open", tfname, NULL));

        rval = ht_enumerate(attrtab, locators_print, tfp);

        fflush(tfp);
        if (ferror(tfp))
                return (herr("writ", tfname, NULL));
        if (fclose(tfp) == EOF)
                return (herr("clos", tfname, NULL));
        if (rval)
                return (rval);
        return (moveifchanged(tfname, "locators.h"));
}

/*
 * Build the "ioconf.h" file with extern declarations for all configured
 * cfdrivers.
 */
int
emitioconfh(void)
{
        const char *tfname;
        FILE *tfp;
        struct devbase *d;
        struct devi *i;

        tfname = "tmp_ioconf.h";
        if ((tfp = fopen(tfname, "w")) == NULL)
                return (herr("open", tfname, NULL));

        fputs("\n/* pseudo-devices */\n", tfp);
        TAILQ_FOREACH(i, &allpseudo, i_next) {
                fprintf(tfp, "void %sattach(int);\n",
                    i->i_base->d_name);
        }

        fputs("\n/* driver structs */\n", tfp);
        TAILQ_FOREACH(d, &allbases, d_next) {
                if (!devbase_has_instances(d, WILD))
                        continue;
                fprintf(tfp, "extern struct cfdriver %s_cd;\n", d->d_name);
        }

        fflush(tfp);
        if (ferror(tfp))
                return herr("writ", tfname, tfp);

        if (fclose(tfp) == EOF)
                return (herr("clos", tfname, NULL));

        return (moveifchanged(tfname, "ioconf.h"));
}

/*
 * Make a file that config_time.h can use as a source, if required.
 */
static int
emittime(void)
{
        FILE *fp;
        time_t t;
        struct tm *tm;
        char buf[128];

        t = time(NULL);
        tm = gmtime(&t);

        if ((fp = fopen("config_time.src", "w")) == NULL)
                return (herr("open", "config_time.src", NULL));

        if (strftime(buf, sizeof(buf), "%c %Z", tm) == 0)
                return (herr("strftime", "config_time.src", fp));

        fprintf(fp, "/* %s */\n"
            "#define CONFIG_TIME\t%2lld\n"
            "#define CONFIG_YEAR\t%2d\n"
            "#define CONFIG_MONTH\t%2d\n"
            "#define CONFIG_DATE\t%2d\n"
            "#define CONFIG_HOUR\t%2d\n"
            "#define CONFIG_MINS\t%2d\n"
            "#define CONFIG_SECS\t%2d\n",
            buf, (long long)t,
            tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
            tm->tm_hour, tm->tm_min, tm->tm_sec);

        fflush(fp);
        if (ferror(fp))
                return (herr("fprintf", "config_time.src", fp));

        if (fclose(fp) != 0)
                return (herr("clos", "config_time.src", NULL));

        /*
         * *Don't* moveifchanged this file.  Makefile.kern.inc will
         * handle that if it determines such a move is necessary.
         */
        return (0);
}

/*
 * Compare two files.  If nfname doesn't exist, or is different from
 * tfname, move tfname to nfname.  Otherwise, delete tfname.
 */
int
moveifchanged(const char *tfname, const char *nfname)
{
        char tbuf[BUFSIZ], nbuf[BUFSIZ];
        FILE *tfp, *nfp;

        if ((tfp = fopen(tfname, "r")) == NULL)
                return (herr("open", tfname, NULL));

        if ((nfp = fopen(nfname, "r")) == NULL)
                goto moveit;

        while (fgets(tbuf, sizeof(tbuf), tfp) != NULL) {
                if (fgets(nbuf, sizeof(nbuf), nfp) == NULL) {
                        /*
                         * Old file has fewer lines.
                         */
                        goto moveit;
                }
                if (strcmp(tbuf, nbuf) != 0)
                        goto moveit;
        }

        /*
         * We've reached the end of the new file.  Check to see if new file
         * has fewer lines than old.
         */
        if (fgets(nbuf, sizeof(nbuf), nfp) != NULL) {
                /*
                 * New file has fewer lines.
                 */
                goto moveit;
        }

        (void) fclose(nfp);
        (void) fclose(tfp);
        if (remove(tfname) == -1)
                return(herr("remov", tfname, NULL));
        return (0);

 moveit:
        /*
         * They're different, or the file doesn't exist.
         */
        if (nfp)
                (void) fclose(nfp);
        if (tfp)
                (void) fclose(tfp);
        if (rename(tfname, nfname) == -1)
                return (herr("renam", tfname, NULL));
        return (0);
}

static int
herr(const char *what, const char *fname, FILE *fp)
{

        warn("error %sing %s", what, fname);
        if (fp)
                (void)fclose(fp);
        return (1);
}

static char *
cntname(const char *src)
{
        char *dst;
        char c;
        static char buf[100];

        dst = buf;
        *dst++ = 'N';
        while ((c = *src++) != 0)
                *dst++ = (char)(islower((u_char)c) ? toupper((u_char)c) : c);
        *dst = 0;
        return (buf);
}