/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 * @(#) Copyright (c) 1993 The Regents of the University of California.  All rights reserved.
 * @(#)jot.c    8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/jot/jot.c,v 1.13.2.3 2001/12/17 13:49:50 gallatin Exp $
 */

/*
 * jot - print sequential or random data
 *
 * Author:  John Kunze, Office of Comp. Affairs, UCB
 */

#include <ctype.h>
#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#define REPS_DEF        100
#define BEGIN_DEF       1
#define ENDER_DEF       100
#define STEP_DEF        1

#define is_default(s)   (strcmp((s), "-") == 0)

int     randomize;
int     infinity;
int     boring;
int     prec;
int     longdata;
int     intdata;
int     chardata;
int     nosign;
int     nofinalnl;
static const    char *sepstring = "\n";
static char     format[BUFSIZ];

static void     getformat(void);
static int      getprec(const char *);
static int      putdata(double, long);
static void     usage(void) __dead2;

int
main(int argc, char **argv)
{
        double  xd, yd;
        long    id;
        double  *x = &xd;
        double  *y = &yd;
        long    *i = &id;
        unsigned int    mask = 0;
        int     n = 0;
        int     ch;
        double  begin = BEGIN_DEF;
        double  ender = ENDER_DEF;
        double  s = STEP_DEF;
        long    reps = REPS_DEF;

        while ((ch = getopt(argc, argv, "rb:w:cs:np:")) != -1)
                switch ((char)ch) {
                case 'r':
                        randomize = 1;
                        break;
                case 'c':
                        chardata = 1;
                        break;
                case 'n':
                        nofinalnl = 1;
                        break;
                case 'b':
                        boring = 1;
                        /* FALLTHROUGH */
                case 'w':
                        if (strlcpy(format, optarg, sizeof(format)) >=
                            sizeof(format))
                                errx(1, "-%c word too long", ch);
                        break;
                case 's':
                        sepstring = optarg;
                        break;
                case 'p':
                        prec = atoi(optarg);
                        if (prec <= 0)
                                errx(1, "bad precision value");
                        break;
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        switch (argc) { /* examine args right to left, falling thru cases */
        case 4:
                if (!is_default(argv[3])) {
                        if (!sscanf(argv[3], "%lf", &s))
                                errx(1, "bad s value: %s", argv[3]);
                        mask |= 01;
                }
                /* FALLTHROUGH */
        case 3:
                if (!is_default(argv[2])) {
                        if (!sscanf(argv[2], "%lf", &ender))
                                ender = argv[2][strlen(argv[2])-1];
                        mask |= 02;
                        if (!prec)
                                n = getprec(argv[2]);
                }
                /* FALLTHROUGH */
        case 2:
                if (!is_default(argv[1])) {
                        if (!sscanf(argv[1], "%lf", &begin))
                                begin = argv[1][strlen(argv[1])-1];
                        mask |= 04;
                        if (!prec)
                                prec = getprec(argv[1]);
                        if (n > prec)           /* maximum precision */
                                prec = n;
                }
                /* FALLTHROUGH */
        case 1:
                if (!is_default(argv[0])) {
                        if (!sscanf(argv[0], "%ld", &reps))
                                errx(1, "bad reps value: %s", argv[0]);
                        mask |= 010;
                }
                break;
        case 0:
                usage();
        default:
                errx(1, "too many arguments.  What do you mean by %s?",
                    argv[4]);
        }
        getformat();
        while (mask)    /* 4 bit mask has 1's where last 4 args were given */
                switch (mask) { /* fill in the 0's by default or computation */
                case 001:
                        reps = REPS_DEF;
                        mask = 011;
                        break;
                case 002:
                        reps = REPS_DEF;
                        mask = 012;
                        break;
                case 003:
                        reps = REPS_DEF;
                        mask = 013;
                        break;
                case 004:
                        reps = REPS_DEF;
                        mask = 014;
                        break;
                case 005:
                        reps = REPS_DEF;
                        mask = 015;
                        break;
                case 006:
                        reps = REPS_DEF;
                        mask = 016;
                        break;
                case 007:
                        if (randomize) {
                                reps = REPS_DEF;
                                mask = 0;
                                break;
                        }
                        if (s == 0.0) {
                                reps = 0;
                                mask = 0;
                                break;
                        }
                        reps = (ender - begin + s) / s;
                        if (reps <= 0)
                                errx(1, "impossible stepsize");
                        mask = 0;
                        break;
                case 010:
                        begin = BEGIN_DEF;
                        mask = 014;
                        break;
                case 011:
                        begin = BEGIN_DEF;
                        mask = 015;
                        break;
                case 012:
                        s = (randomize ? time(NULL) : STEP_DEF);
                        mask = 013;
                        break;
                case 013:
                        if (randomize)
                                begin = BEGIN_DEF;
                        else if (reps == 0)
                                errx(1, "must specify begin if reps == 0");
                        begin = ender - reps * s + s;
                        mask = 0;
                        break;
                case 014:
                        s = (randomize ? -1.0 : STEP_DEF);
                        mask = 015;
                        break;
                case 015:
                        if (randomize)
                                ender = ENDER_DEF;
                        else
                                ender = begin + reps * s - s;
                        mask = 0;
                        break;
                case 016:
                        if (randomize)
                                s = -1.0;
                        else if (reps == 0)
                                errx(1, "infinite sequences cannot be bounded");
                        else if (reps == 1)
                                s = 0.0;
                        else
                                s = (ender - begin) / (reps - 1);
                        mask = 0;
                        break;
                case 017:               /* if reps given and implied, */
                        if (!randomize && s != 0.0) {
                                long t = (ender - begin + s) / s;
                                if (t <= 0)
                                        errx(1, "impossible stepsize");
                                if (t < reps)           /* take lesser */
                                        reps = t;
                        }
                        mask = 0;
                        break;
                default:
                        errx(1, "bad mask");
                }
        if (reps == 0)
                infinity = 1;
        if (randomize) {
                *x = (ender - begin) * (ender > begin ? 1 : -1);
                for (*i = 1; *i <= reps || infinity; (*i)++) {
                        *y = arc4random() / (double)0xffffffffU;
                        if (putdata(*y * *x + begin, reps - *i))
                                errx(1, "range error in conversion");
                }
        } else
                for (*i = 1, *x = begin; *i <= reps || infinity; (*i)++, *x += s)
                        if (putdata(*x, reps - *i))
                                errx(1, "range error in conversion");
        if (!nofinalnl)
                putchar('\n');
        exit(0);
}

static int
putdata(double x, long notlast)
{

        if (boring)
                printf("%s", format);
        else if (longdata && nosign) {
                if (x <= (double)ULONG_MAX && x >= (double)0)
                        printf(format, (unsigned long)x);
                else
                        return (1);
        } else if (longdata) {
                if (x <= (double)LONG_MAX && x >= (double)LONG_MIN)
                        printf(format, (long)x);
                else
                        return (1);
        } else if (chardata || (intdata && !nosign)) {
                if (x <= (double)INT_MAX && x >= (double)INT_MIN)
                        printf(format, (int)x);
                else
                        return (1);
        } else if (intdata) {
                if (x <= (double)UINT_MAX && x >= (double)0)
                        printf(format, (unsigned int)x);
                else
                        return (1);

        } else
                printf(format, x);
        if (notlast != 0)
                fputs(sepstring, stdout);

        return (0);
}

static void
usage(void)
{
        fprintf(stderr, "%s\n%s\n",
        "usage: jot [-cnr] [-b word] [-w word] [-s string] [-p precision]",
        "           [reps [begin [end [s]]]]");
        exit(1);
}

static int
getprec(const char *str)
{
        const char      *p;
        const char      *q;

        for (p = str; *p; p++)
                if (*p == '.')
                        break;
        if (!*p)
                return (0);
        for (q = ++p; *p; p++)
                if (!isdigit(*p))
                        break;
        return (p - q);
}

static void
getformat(void)
{
        char    *p, *p2;
        int dot, hash, space, sign, numbers = 0;
        size_t sz;

        if (boring)                             /* no need to bother */
                return;
        for (p = format; *p; p++)               /* look for '%' */
                if (*p == '%' && *(p+1) != '%') /* leave %% alone */
                        break;
        sz = sizeof(format) - strlen(format) - 1;
        if (!*p && !chardata) {
                if (snprintf(p, sz, "%%.%df", prec) >= (int)sz)
                        errx(1, "-w word too long");
        } else if (!*p && chardata) {
                if (strlcpy(p, "%c", sz) >= sz)
                        errx(1, "-w word too long");
                intdata = 1;
        } else if (!*(p+1)) {
                if (sz <= 0)
                        errx(1, "-w word too long");
                strcat(format, "%");            /* cannot end in single '%' */
        } else {
                /*
                 * Allow conversion format specifiers of the form
                 * %[#][ ][{+,-}][0-9]*[.[0-9]*]? where ? must be one of
                 * [l]{d,i,o,u,x} or {f,e,g,E,G,d,o,x,D,O,U,X,c,u}
                 */
                p2 = p++;
                dot = hash = space = sign = numbers = 0;
                while (!isalpha(*p)) {
                        if (isdigit(*p)) {
                                numbers++;
                                p++;
                        } else if ((*p == '#' && !(numbers|dot|sign|space|
                            hash++)) ||
                            (*p == ' ' && !(numbers|dot|space++)) ||
                            ((*p == '+' || *p == '-') && !(numbers|dot|sign++))
                            || (*p == '.' && !(dot++)))
                                p++;
                        else
                                goto fmt_broken;
                }
                if (*p == 'l') {
                        longdata = 1;
                        if (*++p == 'l') {
                                if (p[1] != '\0')
                                        p++;
                                goto fmt_broken;
                        }
                }
                switch (*p) {
                case 'o': case 'u': case 'x': case 'X':
                        intdata = nosign = 1;
                        break;
                case 'd': case 'i':
                        intdata = 1;
                        break;
                case 'D':
                        if (longdata)
                                goto fmt_broken;
                        intdata = 1;
                        break;
                case 'O': case 'U':
                        if (longdata)
                                goto fmt_broken;
                        intdata = nosign = 1;
                        break;
                case 'c':
                        if (!(intdata | longdata)) {
                                chardata = 1;
                                break;
                        }
                case 'h': case 'n': case 'p': case 'q': case 's': case 'L':
                case '$': case '*':
                        goto fmt_broken;
                case 'f': case 'e': case 'g': case 'E': case 'G':
                        if (!longdata)
                                break;
                        /* FALLTHROUGH */
                default:
fmt_broken:
                        *++p = '\0';
                        errx(1, "illegal or unsupported format '%s'", p2);
                        /* NOTREACHED */
                }
                while (*++p)
                        if (*p == '%' && *(p+1) && *(p+1) != '%')
                                errx(1, "too many conversions");
                        else if (*p == '%' && *(p+1) == '%')
                                p++;
                        else if (*p == '%' && !*(p+1)) {
                                strcat(format, "%");
                                break;
                        }
        }
}