/*      $NetBSD: strfile.c,v 1.44 2022/08/07 11:06:18 andvar Exp $      */

/*-
 * Copyright (c) 1989, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ken Arnold.
 *
 * 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

#ifdef __NetBSD__
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)strfile.c   8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: strfile.c,v 1.44 2022/08/07 11:06:18 andvar Exp $");
#endif
#endif /* not lint */
#endif /* __NetBSD__ */

#include <sys/types.h>
#include <sys/param.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <inttypes.h>
#include <err.h>

#include "strfile.h"

#ifndef MAXPATHLEN
#define MAXPATHLEN      1024
#endif  /* MAXPATHLEN */

/*
 *      This program takes a file composed of strings separated by
 * lines starting with two consecutive delimiting character (default
 * character is '%') and creates another file which consists of a table
 * describing the file (structure from "strfile.h"), a table of seek
 * pointers to the start of the strings, and the strings, each terminated
 * by a null byte.  Usage:
 *
 *      % strfile [-iorsx] [ -cC ] sourcefile [ datafile ]
 *
 *      c - Change delimiting character from '%' to 'C'
 *      s - Silent.  Give no summary of data processed at the end of
 *          the run.
 *      o - order the strings in alphabetic order
 *      i - if ordering, ignore case
 *      r - randomize the order of the strings
 *      x - set rotated bit
 *
 *              Ken Arnold      Sept. 7, 1978 --
 *
 *      Added ordering options.
 */

# define        STORING_PTRS    (Oflag || Rflag)
# define        CHUNKSIZE       512

# define        ALLOC(ptr,sz)   do { \
                        if (ptr == NULL) \
                                ptr = malloc(CHUNKSIZE * sizeof *ptr); \
                        else if (((sz) + 1) % CHUNKSIZE == 0) \
                                ptr = realloc(ptr, ((sz) + CHUNKSIZE) * sizeof *ptr); \
                        if (ptr == NULL) \
                                err(1, "out of space"); \
                } while (0)

typedef struct {
        char    first;
        off_t   pos;
} STR;

static char *Infile = NULL;             /* input file name */
static char Outfile[MAXPATHLEN] = "";   /* output file name */
static char Delimch = '%';              /* delimiting character */

static int Sflag        = 0;            /* silent run flag */
static int Oflag        = 0;            /* ordering flag */
static int Iflag        = 0;            /* ignore case flag */
static int Rflag        = 0;            /* randomize order flag */
static int Xflag        = 0;            /* set rotated bit */
static long Num_pts     = 0;            /* number of pointers/strings */

static off_t *Seekpts;

static FILE *Sort_1, *Sort_2;           /* pointers for sorting */

static STRFILE Tbl;                     /* statistics table */

static STR *Firstch;                    /* first chars of each string */


static uint32_t h2nl(uint32_t h);
static void getargs(int argc, char **argv);
static void usage(const char *, ...) __dead __printflike(1, 2);
static void add_offset(FILE *fp, off_t off);
static void do_order(void);
static int cmp_str(const void *vp1, const void *vp2);
static void randomize(void);
static void fwrite_be_offt(off_t off, FILE *f);


/*
 * main:
 *      Drive the sucker.  There are two main modes -- either we store
 *      the seek pointers, if the table is to be sorted or randomized,
 *      or we write the pointer directly to the file, if we are to stay
 *      in file order.  If the former, we allocate and re-allocate in
 *      CHUNKSIZE blocks; if the latter, we just write each pointer,
 *      and then seek back to the beginning to write in the table.
 */
int
main(int ac, char **av)
{
        char            *sp, dc;
        FILE            *inf, *outf;
        off_t           last_off, length, pos;
        int             first;
        char            *nsp;
        STR             *fp;
        static char     string[257];
        long            i;

        /* sanity test */
        if (sizeof(uint32_t) != 4)
                errx(1, "sizeof(uint32_t) != 4");

        getargs(ac, av);                /* evalute arguments */
        dc = Delimch;
        if ((inf = fopen(Infile, "r")) == NULL)
                err(1, "open `%s'", Infile);

        if ((outf = fopen(Outfile, "w")) == NULL)
                err(1, "open `%s'", Outfile);
        if (!STORING_PTRS)
                (void) fseek(outf, sizeof Tbl, SEEK_SET);

        /*
         * Write the strings onto the file
         */

        Tbl.str_longlen = 0;
        Tbl.str_shortlen = (unsigned int) 0x7fffffff;
        Tbl.str_delim = dc;
        Tbl.str_version = VERSION;
        first = Oflag;
        add_offset(outf, ftell(inf));
        last_off = 0;
        do {
                sp = fgets(string, 256, inf);
                if (sp == NULL || (sp[0] == dc && sp[1] == '\n')) {
                        pos = ftell(inf);
                        length = pos - last_off - (sp ? strlen(sp) : 0);
                        last_off = pos;
                        if (!length)
                                continue;
                        add_offset(outf, pos);
                        if ((off_t)Tbl.str_longlen < length)
                                Tbl.str_longlen = length;
                        if ((off_t)Tbl.str_shortlen > length)
                                Tbl.str_shortlen = length;
                        first = Oflag;
                }
                else if (first) {
                        for (nsp = sp; !isalnum((unsigned char)*nsp); nsp++)
                                continue;
                        ALLOC(Firstch, Num_pts);
                        fp = &Firstch[Num_pts - 1];
                        if (Iflag && isupper((unsigned char)*nsp))
                                fp->first = tolower((unsigned char)*nsp);
                        else
                                fp->first = *nsp;
                        fp->pos = Seekpts[Num_pts - 1];
                        first = 0;
                }
        } while (sp != NULL);

        /*
         * write the tables in
         */

        (void) fclose(inf);

        if (Oflag)
                do_order();
        else if (Rflag)
                randomize();

        if (Xflag)
                Tbl.str_flags |= STR_ROTATED;

        if (!Sflag) {
                printf("\"%s\" created\n", Outfile);
                if (Num_pts == 2)
                        puts("There was 1 string");
                else
                        printf("There were %d strings\n", (int)(Num_pts - 1));
                printf("Longest string: %lu byte%s\n", (unsigned long)Tbl.str_longlen,
                       Tbl.str_longlen == 1 ? "" : "s");
                printf("Shortest string: %lu byte%s\n", (unsigned long)Tbl.str_shortlen,
                       Tbl.str_shortlen == 1 ? "" : "s");
        }

        (void) fseek(outf, (off_t) 0, SEEK_SET);
        Tbl.str_version = h2nl(Tbl.str_version);
        Tbl.str_numstr = h2nl(Num_pts - 1);
        Tbl.str_longlen = h2nl(Tbl.str_longlen);
        Tbl.str_shortlen = h2nl(Tbl.str_shortlen);
        Tbl.str_flags = h2nl(Tbl.str_flags);
        (void) fwrite((char *) &Tbl, sizeof Tbl, 1, outf);
        if (STORING_PTRS) {
                for (i = 0; i < Num_pts; i++)
                        fwrite_be_offt(Seekpts[i], outf);
        }
        fflush(outf);
        if (ferror(outf))
                err(1, "fwrite %s", Outfile);
        (void) fclose(outf);
        exit(0);
}

/*
 *      This routine evaluates arguments from the command line
 */
static void
getargs(int argc, char **argv)
{
        int     ch;
        extern  int optind;
        extern  char *optarg;
        size_t  len;

        while ((ch = getopt(argc, argv, "c:iorsx")) != -1)
                switch(ch) {
                case 'c':                       /* new delimiting char */
                        Delimch = *optarg;
                        if (!isascii(Delimch)) {
                                printf("bad delimiting character: '\\%o\n'",
                                       Delimch);
                        }
                        break;
                case 'i':                       /* ignore case in ordering */
                        Iflag++;
                        break;
                case 'o':                       /* order strings */
                        Oflag++;
                        break;
                case 'r':                       /* randomize pointers */
                        Rflag++;
                        break;
                case 's':                       /* silent */
                        Sflag++;
                        break;
                case 'x':                       /* set the rotated bit */
                        Xflag++;
                        break;
                case '?':
                default:
                        usage(NULL);
                }
        argv += optind;

        if (*argv) {
                Infile = *argv;
                if (*++argv) {
                        len = strlcpy(Outfile, *argv, sizeof(Outfile));
                        if (len >= sizeof(Outfile)) {
                                usage("Too long output filename");
                        }
                }
        }
        if (!Infile) {
                usage("No input file name");
        }
        if (*Outfile == '\0') {
                len = snprintf(Outfile, sizeof(Outfile), "%s.dat", Infile);
                if (len >= sizeof(Outfile)) {
                        usage("Too long input filename");
                }
        }
}

static void
usage(const char *fmt, ...)
{
        if (fmt) {
                va_list ap;
                va_start(ap, fmt);
                vwarnx(fmt, ap);
                va_end(ap);
        }
        (void) fprintf(stderr,
            "Usage: %s [-iorsx] [-c char] sourcefile [datafile]\n",
            getprogname());
        exit(1);
}

/*
 * add_offset:
 *      Add an offset to the list, or write it out, as appropriate.
 */
static void
add_offset(FILE *fp, off_t off)
{

        if (!STORING_PTRS) {
                fwrite_be_offt(off, fp);
        } else {
                ALLOC(Seekpts, Num_pts + 1);
                Seekpts[Num_pts] = off;
        }
        Num_pts++;
}

/*
 * do_order:
 *      Order the strings alphabetically (possibly ignoring case).
 */
static void
do_order(void)
{
        int     i;
        off_t   *lp;
        STR     *fp;

        Sort_1 = fopen(Infile, "r");
        Sort_2 = fopen(Infile, "r");
        qsort((char *) Firstch, (int) Tbl.str_numstr, sizeof *Firstch, cmp_str);
        i = Tbl.str_numstr;
        lp = Seekpts;
        fp = Firstch;
        while (i--)
                *lp++ = fp++->pos;
        (void) fclose(Sort_1);
        (void) fclose(Sort_2);
        Tbl.str_flags |= STR_ORDERED;
}

static int
cmp_str(const void *vp1, const void *vp2)
{
        const STR       *p1, *p2;
        int     c1, c2;
        int     n1, n2;

        p1 = (const STR *)vp1;
        p2 = (const STR *)vp2;

# define        SET_N(nf,ch)    (nf = (ch == '\n'))
# define        IS_END(ch,nf)   (ch == Delimch && nf)

        c1 = p1->first;
        c2 = p2->first;
        if (c1 != c2)
                return c1 - c2;

        (void) fseek(Sort_1, p1->pos, SEEK_SET);
        (void) fseek(Sort_2, p2->pos, SEEK_SET);

        n1 = 0;
        n2 = 0;
        while (!isalnum(c1 = getc(Sort_1)) && c1 != '\0')
                SET_N(n1, c1);
        while (!isalnum(c2 = getc(Sort_2)) && c2 != '\0')
                SET_N(n2, c2);

        while (!IS_END(c1, n1) && !IS_END(c2, n2)) {
                if (Iflag) {
                        if (isupper(c1))
                                c1 = tolower(c1);
                        if (isupper(c2))
                                c2 = tolower(c2);
                }
                if (c1 != c2)
                        return c1 - c2;
                SET_N(n1, c1);
                SET_N(n2, c2);
                c1 = getc(Sort_1);
                c2 = getc(Sort_2);
        }
        if (IS_END(c1, n1))
                c1 = 0;
        if (IS_END(c2, n2))
                c2 = 0;
        return c1 - c2;
}

/*
 * randomize:
 *      Randomize the order of the string table.  We must be careful
 *      not to randomize across delimiter boundaries.  All
 *      randomization is done within each block.
 */
static void
randomize(void)
{
        int     cnt, i;
        off_t   tmp;
        off_t   *sp;

        srandom((int)(time(NULL) + getpid()));

        Tbl.str_flags |= STR_RANDOM;
        cnt = Tbl.str_numstr;

        /*
         * move things around randomly
         */

        for (sp = Seekpts; cnt > 0; cnt--, sp++) {
                i = random() % cnt;
                tmp = sp[0];
                sp[0] = sp[i];
                sp[i] = tmp;
        }
}

/*
 * fwrite_be_offt:
 *      Write out the off parameter as a 64 bit big endian number
 */

static void
fwrite_be_offt(off_t off, FILE *f)
{
        int             i;
        unsigned char   c[8];

        for (i = 7; i >= 0; i--) {
                c[i] = off & 0xff;
                off >>= 8;
        }
        fwrite(c, sizeof(c), 1, f);
}

static uint32_t
h2nl(uint32_t h)
{
        unsigned char c[4];
        uint32_t rv;

        c[0] = (h >> 24) & 0xff;
        c[1] = (h >> 16) & 0xff;
        c[2] = (h >>  8) & 0xff;
        c[3] = (h >>  0) & 0xff;
        memcpy(&rv, c, sizeof rv);

        return (rv);
}