400 lines
9.2 KiB
C
400 lines
9.2 KiB
C
/* $NetBSD: jot.c,v 1.25 2009/04/12 11:19:18 lukem Exp $ */
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/*-
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)jot.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: jot.c,v 1.25 2009/04/12 11:19:18 lukem Exp $");
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#endif /* not lint */
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/*
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* jot - print sequential or random data
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*
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* Author: John Kunze, Office of Comp. Affairs, UCB
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*/
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#include <ctype.h>
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#include <err.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define REPS_DEF 100
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#define BEGIN_DEF 1
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#define ENDER_DEF 100
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#define STEP_DEF 1
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#define is_default(s) (strcmp((s), "-") == 0)
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static double begin = BEGIN_DEF;
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static double ender = ENDER_DEF;
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static double step = STEP_DEF;
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static long reps = REPS_DEF;
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static int randomize;
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static int boring;
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static int prec = -1;
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static int dox;
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static int chardata;
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static int nofinalnl;
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static const char *sepstring = "\n";
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static char format[BUFSIZ];
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static void getargs(int, char *[]);
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static void getformat(void);
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static int getprec(char *);
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static void putdata(double, long);
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static void usage(void) __dead;
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int
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main(int argc, char *argv[])
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{
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double x;
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long i;
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getargs(argc, argv);
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if (randomize) {
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x = ender - begin;
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if (x < 0) {
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x = -x;
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begin = ender;
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}
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if (dox == 0)
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/*
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* We are printing floating point, generate random
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* number that include both supplied limits.
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* Due to FP routing for display the low and high
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* values are likely to occur half as often as all
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* the others.
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*/
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x /= (1u << 31) - 1.0;
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else {
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/*
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* We are printing integers increase the range by
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* one but ensure we never generate it.
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* This makes all the integer values equally likely.
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*/
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x += 1.0;
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x /= (1u << 31);
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}
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srandom((unsigned long) step);
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for (i = 1; i <= reps || reps == 0; i++)
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putdata(random() * x + begin, reps - i);
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} else {
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/*
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* If we are going to display as integer, add 0.5 here
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* and use floor(x) later to get sane rounding.
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*/
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x = begin;
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if (dox)
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x += 0.5;
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for (i = 1; i <= reps || reps == 0; i++, x += step)
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putdata(x, reps - i);
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}
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if (!nofinalnl)
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putchar('\n');
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exit(0);
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}
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static void
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getargs(int argc, char *argv[])
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{
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unsigned int have = 0;
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#define BEGIN 1
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#define STEP 2 /* seed if -r */
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#define REPS 4
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#define ENDER 8
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int n = 0;
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long t;
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char *ep;
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for (;;) {
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switch (getopt(argc, argv, "b:cnp:rs:w:")) {
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default:
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usage();
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case -1:
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break;
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case 'c':
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chardata = 1;
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continue;
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case 'n':
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nofinalnl = 1;
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continue;
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case 'p':
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prec = strtol(optarg, &ep, 0);
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if (*ep != 0 || prec < 0)
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errx(EXIT_FAILURE, "Bad precision value");
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continue;
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case 'r':
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randomize = 1;
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continue;
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case 's':
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sepstring = optarg;
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continue;
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case 'b':
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boring = 1;
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/* FALLTHROUGH */
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case 'w':
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strlcpy(format, optarg, sizeof(format));
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continue;
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}
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break;
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}
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argc -= optind;
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argv += optind;
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switch (argc) { /* examine args right to left, falling thru cases */
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case 4:
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if (!is_default(argv[3])) {
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step = strtod(argv[3], &ep);
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if (*ep != 0)
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errx(EXIT_FAILURE, "Bad step value: %s",
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argv[3]);
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have |= STEP;
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}
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case 3:
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if (!is_default(argv[2])) {
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if (!sscanf(argv[2], "%lf", &ender))
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ender = argv[2][strlen(argv[2])-1];
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have |= ENDER;
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if (prec < 0)
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n = getprec(argv[2]);
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}
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case 2:
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if (!is_default(argv[1])) {
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if (!sscanf(argv[1], "%lf", &begin))
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begin = argv[1][strlen(argv[1])-1];
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have |= BEGIN;
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if (prec < 0)
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prec = getprec(argv[1]);
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if (n > prec) /* maximum precision */
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prec = n;
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}
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case 1:
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if (!is_default(argv[0])) {
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reps = strtoul(argv[0], &ep, 0);
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if (*ep != 0 || reps < 0)
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errx(EXIT_FAILURE, "Bad reps value: %s",
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argv[0]);
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have |= REPS;
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}
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break;
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case 0:
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usage();
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break;
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default:
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errx(EXIT_FAILURE,
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"Too many arguments. What do you mean by %s?", argv[4]);
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}
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getformat();
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if (prec == -1)
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prec = 0;
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if (randomize) {
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/* 'step' is the seed here, use pseudo-random default */
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if (!(have & STEP))
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step = time(NULL) * getpid();
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/* Take the default values for everything else */
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return;
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}
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/*
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* The loop we run uses begin/step/reps, so if we have been
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* given an end value (ender) we must use it to replace the
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* default values of the others.
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* We will assume a begin of 0 and step of 1 if necessary.
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*/
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switch (have) {
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case ENDER | STEP:
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case ENDER | STEP | BEGIN:
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/* Calculate reps */
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if (step == 0.0)
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reps = 0; /* ie infinite */
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else {
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reps = (ender - begin + step) / step;
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if (reps <= 0)
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errx(EXIT_FAILURE, "Impossible stepsize");
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}
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break;
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case REPS | ENDER:
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case REPS | ENDER | STEP:
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/* Calculate begin */
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if (reps == 0)
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errx(EXIT_FAILURE,
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"Must specify begin if reps == 0");
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begin = ender - reps * step + step;
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break;
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case REPS | BEGIN | ENDER:
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/* Calculate step */
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if (reps == 0)
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errx(EXIT_FAILURE,
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"Infinite sequences cannot be bounded");
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if (reps == 1)
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step = 0.0;
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else
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step = (ender - begin) / (reps - 1);
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break;
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case REPS | BEGIN | ENDER | STEP:
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/* reps given and implied - take smaller */
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if (step == 0.0)
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break;
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t = (ender - begin + step) / step;
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if (t <= 0)
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errx(EXIT_FAILURE,
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"Impossible stepsize");
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if (t < reps)
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reps = t;
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break;
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default:
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/* No values can be calculated, use defaults */
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break;
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}
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}
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static void
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putdata(double x, long notlast)
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{
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if (boring) /* repeated word */
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printf("%s", format);
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else if (dox) /* scalar */
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printf(format, (long)floor(x));
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else /* real */
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printf(format, x);
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if (notlast != 0)
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fputs(sepstring, stdout);
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}
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__dead static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-cnr] [-b word] [-p precision] "
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"[-s string] [-w word] [reps [begin [end [step | seed]]]]\n",
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getprogname());
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exit(1);
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}
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static int
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getprec(char *num_str)
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{
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num_str = strchr(num_str, '.');
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if (num_str == NULL)
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return 0;
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return strspn(num_str + 1, "0123456789");
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}
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static void
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getformat(void)
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{
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char *p;
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size_t sz;
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if (boring) /* no need to bother */
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return;
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for (p = format; *p; p++) { /* look for '%' */
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if (*p == '%') {
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if (*(p+1) != '%')
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break;
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p++; /* leave %% alone */
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}
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}
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sz = sizeof(format) - strlen(format) - 1;
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if (!*p) {
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if (chardata || prec == 0) {
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if ((size_t)snprintf(p, sz, "%%%s", chardata ? "c" : "ld") >= sz)
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errx(EXIT_FAILURE, "-w word too long");
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dox = 1;
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} else {
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if (snprintf(p, sz, "%%.%df", prec) >= (int)sz)
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errx(EXIT_FAILURE, "-w word too long");
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}
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} else if (!*(p+1)) {
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if (sz <= 0)
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errx(EXIT_FAILURE, "-w word too long");
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strcat(format, "%"); /* cannot end in single '%' */
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} else {
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p++; /* skip leading % */
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for(; *p && !isalpha((unsigned char)*p); p++) {
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/* allow all valid printf(3) flags, but deny '*' */
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if (!strchr("0123456789#-+. ", *p))
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break;
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}
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/* Allow 'l' prefix, but no other. */
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if (*p == 'l')
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p++;
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switch (*p) {
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case 'f': case 'e': case 'g': case '%':
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case 'E': case 'G':
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break;
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case 's':
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errx(EXIT_FAILURE,
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"cannot convert numeric data to strings");
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break;
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case 'd': case 'o': case 'x': case 'u':
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case 'D': case 'O': case 'X': case 'U':
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case 'c': case 'i':
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dox = 1;
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break;
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default:
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errx(EXIT_FAILURE, "unknown or invalid format `%s'",
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format);
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}
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/* Need to check for trailing stuff to print */
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for (; *p; p++) /* look for '%' */
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if (*p == '%') {
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if (*(p+1) != '%')
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break;
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p++; /* leave %% alone */
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}
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if (*p)
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errx(EXIT_FAILURE, "unknown or invalid format `%s'",
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format);
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}
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}
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