515 lines
12 KiB
C
515 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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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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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/capsicum.h>
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#include <capsicum_helpers.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.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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/* Defaults */
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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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/* Flags of options that have been set */
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#define HAVE_STEP 1
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#define HAVE_ENDER 2
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#define HAVE_BEGIN 4
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#define HAVE_REPS 8
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#define is_default(s) (*(s) == 0 || strcmp((s), "-") == 0)
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static bool boring;
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static int prec = -1;
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static bool longdata;
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static bool intdata;
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static bool chardata;
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static bool nosign;
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static const char *sepstring = "\n";
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static char format[BUFSIZ];
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static void getformat(void);
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static int getprec(const char *);
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static int putdata(double, bool);
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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cap_rights_t rights;
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bool have_format = false;
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bool infinity = false;
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bool nofinalnl = false;
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bool randomize = false;
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bool use_random = false;
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int ch;
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int mask = 0;
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int n = 0;
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double begin = BEGIN_DEF;
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double divisor;
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double ender = ENDER_DEF;
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double s = STEP_DEF;
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double x, y;
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long i;
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long reps = REPS_DEF;
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if (caph_limit_stdio() < 0)
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err(1, "unable to limit rights for stdio");
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cap_rights_init(&rights);
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if (caph_rights_limit(STDIN_FILENO, &rights) < 0)
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err(1, "unable to limit rights for stdin");
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/*
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* Cache NLS data, for strerror, for err(3), before entering capability
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* mode.
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*/
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caph_cache_catpages();
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if (caph_enter() < 0)
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err(1, "unable to enter capability mode");
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while ((ch = getopt(argc, argv, "b:cnp:rs:w:")) != -1)
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switch (ch) {
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case 'b':
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boring = true;
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/* FALLTHROUGH */
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case 'w':
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if (strlcpy(format, optarg, sizeof(format)) >=
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sizeof(format))
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errx(1, "-%c word too long", ch);
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have_format = true;
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break;
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case 'c':
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chardata = true;
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break;
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case 'n':
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nofinalnl = true;
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break;
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case 'p':
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prec = atoi(optarg);
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if (prec < 0)
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errx(1, "bad precision value");
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have_format = true;
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break;
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case 'r':
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randomize = true;
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break;
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case 's':
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sepstring = optarg;
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break;
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default:
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usage();
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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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if (!sscanf(argv[3], "%lf", &s))
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errx(1, "bad s value: %s", argv[3]);
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mask |= HAVE_STEP;
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if (randomize)
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use_random = true;
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}
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/* FALLTHROUGH */
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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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mask |= 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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/* FALLTHROUGH */
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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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mask |= 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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/* FALLTHROUGH */
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case 1:
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if (!is_default(argv[0])) {
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if (!sscanf(argv[0], "%ld", &reps))
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errx(1, "bad reps value: %s", argv[0]);
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mask |= 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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default:
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errx(1, "too many arguments. What do you mean by %s?",
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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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while (mask) /* 4 bit mask has 1's where last 4 args were given */
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switch (mask) { /* fill in the 0's by default or computation */
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case HAVE_STEP:
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case HAVE_ENDER:
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case HAVE_ENDER | HAVE_STEP:
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case HAVE_BEGIN:
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case HAVE_BEGIN | HAVE_STEP:
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reps = REPS_DEF;
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mask |= HAVE_REPS;
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break;
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case HAVE_BEGIN | HAVE_ENDER:
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s = ender > begin ? 1 : -1;
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mask |= HAVE_STEP;
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break;
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case HAVE_BEGIN | HAVE_ENDER | HAVE_STEP:
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if (randomize)
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reps = REPS_DEF;
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else if (s == 0.0)
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reps = 0;
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else
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reps = (ender - begin + s) / s;
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if (reps <= 0)
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errx(1, "impossible stepsize");
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mask = 0;
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break;
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case HAVE_REPS:
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case HAVE_REPS | HAVE_STEP:
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begin = BEGIN_DEF;
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mask |= HAVE_BEGIN;
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break;
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case HAVE_REPS | HAVE_ENDER:
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s = STEP_DEF;
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mask = HAVE_REPS | HAVE_ENDER | HAVE_STEP;
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break;
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case HAVE_REPS | HAVE_ENDER | HAVE_STEP:
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if (randomize)
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begin = BEGIN_DEF;
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else if (reps == 0)
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errx(1, "must specify begin if reps == 0");
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begin = ender - reps * s + s;
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mask = 0;
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break;
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case HAVE_REPS | HAVE_BEGIN:
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s = STEP_DEF;
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mask = HAVE_REPS | HAVE_BEGIN | HAVE_STEP;
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break;
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case HAVE_REPS | HAVE_BEGIN | HAVE_STEP:
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if (randomize)
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ender = ENDER_DEF;
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else
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ender = begin + reps * s - s;
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mask = 0;
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break;
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case HAVE_REPS | HAVE_BEGIN | HAVE_ENDER:
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if (reps == 0)
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errx(1, "infinite sequences cannot be bounded");
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else if (reps == 1)
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s = 0.0;
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else
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s = (ender - begin) / (reps - 1);
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mask = 0;
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break;
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case HAVE_REPS | HAVE_BEGIN | HAVE_ENDER | HAVE_STEP:
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/* if reps given and implied, */
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if (!randomize && s != 0.0) {
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long t = (ender - begin + s) / s;
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if (t <= 0)
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errx(1, "impossible stepsize");
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if (t < reps) /* take lesser */
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reps = t;
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}
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mask = 0;
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break;
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default:
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errx(1, "bad mask");
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}
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if (reps == 0)
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infinity = true;
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if (randomize) {
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if (use_random) {
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srandom((unsigned long)s);
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divisor = (double)INT32_MAX + 1;
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} else
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divisor = (double)UINT32_MAX + 1;
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/*
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* Attempt to DWIM when the user has specified an
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* integer range within that of the random number
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* generator: distribute the numbers equally in
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* the range [begin .. ender]. Jot's default %.0f
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* format would make the appearance of the first and
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* last specified value half as likely as the rest.
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*/
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if (!have_format && prec == 0 &&
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begin >= 0 && begin < divisor &&
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ender >= 0 && ender < divisor) {
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if (begin <= ender)
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ender += 1;
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else
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begin += 1;
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nosign = true;
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intdata = true;
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(void)strlcpy(format,
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chardata ? "%c" : "%u", sizeof(format));
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}
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x = ender - begin;
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for (i = 1; i <= reps || infinity; i++) {
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if (use_random)
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y = random() / divisor;
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else
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y = arc4random() / divisor;
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if (putdata(y * x + begin, !(reps - i)))
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errx(1, "range error in conversion");
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}
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} else
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for (i = 1, x = begin; i <= reps || infinity; i++, x += s)
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if (putdata(x, !(reps - i)))
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errx(1, "range error in conversion");
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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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/*
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* Send x to stdout using the specified format.
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* Last is true if this is the set's last value.
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* Return 0 if OK, or a positive number if the number passed was
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* outside the range specified by the various flags.
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*/
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static int
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putdata(double x, bool last)
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{
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if (boring)
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printf("%s", format);
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else if (longdata && nosign) {
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if (x <= (double)ULONG_MAX && x >= (double)0)
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printf(format, (unsigned long)x);
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else
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return (1);
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} else if (longdata) {
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if (x <= (double)LONG_MAX && x >= (double)LONG_MIN)
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printf(format, (long)x);
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else
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return (1);
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} else if (chardata || (intdata && !nosign)) {
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if (x <= (double)INT_MAX && x >= (double)INT_MIN)
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printf(format, (int)x);
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else
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return (1);
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} else if (intdata) {
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if (x <= (double)UINT_MAX && x >= (double)0)
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printf(format, (unsigned int)x);
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else
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return (1);
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} else
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printf(format, x);
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if (!last)
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fputs(sepstring, stdout);
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return (0);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "%s\n%s\n",
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"usage: jot [-cnr] [-b word] [-w word] [-s string] [-p precision]",
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" [reps [begin [end [s]]]]");
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exit(1);
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}
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/*
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* Return the number of digits following the number's decimal point.
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* Return 0 if no decimal point is found.
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*/
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static int
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getprec(const char *str)
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{
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const char *p;
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const char *q;
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for (p = str; *p; p++)
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if (*p == '.')
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break;
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if (!*p)
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return (0);
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for (q = ++p; *p; p++)
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if (!isdigit((unsigned char)*p))
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break;
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return (p - q);
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}
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/*
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* Set format, intdata, chardata, longdata, and nosign
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* based on the command line arguments.
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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, *p2;
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int dot, hash, space, sign, numbers = 0;
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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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p++; /* leave %% alone */
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else
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break;
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}
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sz = sizeof(format) - strlen(format) - 1;
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if (!*p && !chardata) {
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if (snprintf(p, sz, "%%.%df", prec) >= (int)sz)
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errx(1, "-w word too long");
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} else if (!*p && chardata) {
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if (strlcpy(p, "%c", sz) >= sz)
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errx(1, "-w word too long");
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intdata = true;
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} else if (!*(p+1)) {
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if (sz <= 0)
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errx(1, "-w word too long");
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strcat(format, "%"); /* cannot end in single '%' */
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} else {
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/*
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* Allow conversion format specifiers of the form
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* %[#][ ][{+,-}][0-9]*[.[0-9]*]? where ? must be one of
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* [l]{d,i,o,u,x} or {f,e,g,E,G,d,o,x,D,O,U,X,c,u}
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*/
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p2 = p++;
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dot = hash = space = sign = numbers = 0;
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while (!isalpha((unsigned char)*p)) {
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if (isdigit((unsigned char)*p)) {
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numbers++;
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p++;
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} else if ((*p == '#' && !(numbers|dot|sign|space|
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hash++)) ||
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(*p == ' ' && !(numbers|dot|space++)) ||
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((*p == '+' || *p == '-') && !(numbers|dot|sign++))
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|| (*p == '.' && !(dot++)))
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p++;
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else
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goto fmt_broken;
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}
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if (*p == 'l') {
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longdata = true;
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if (*++p == 'l') {
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if (p[1] != '\0')
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p++;
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goto fmt_broken;
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}
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}
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switch (*p) {
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case 'o': case 'u': case 'x': case 'X':
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intdata = nosign = true;
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break;
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case 'd': case 'i':
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intdata = true;
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break;
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case 'D':
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if (!longdata) {
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intdata = true;
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break;
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}
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case 'O': case 'U':
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if (!longdata) {
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intdata = nosign = true;
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break;
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}
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case 'c':
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if (!(intdata | longdata)) {
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chardata = true;
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break;
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}
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case 'h': case 'n': case 'p': case 'q': case 's': case 'L':
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case '$': case '*':
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goto fmt_broken;
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case 'f': case 'e': case 'g': case 'E': case 'G':
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if (!longdata)
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break;
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/* FALLTHROUGH */
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default:
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fmt_broken:
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*++p = '\0';
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errx(1, "illegal or unsupported format '%s'", p2);
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/* NOTREACHED */
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}
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while (*++p)
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if (*p == '%' && *(p+1) && *(p+1) != '%')
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errx(1, "too many conversions");
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else if (*p == '%' && *(p+1) == '%')
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p++;
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else if (*p == '%' && !*(p+1)) {
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if (strlcat(format, "%", sizeof(format)) >=
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sizeof(format))
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errx(1, "-w word too long");
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break;
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}
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}
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}
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