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freebsd-dev/usr.bin/jot/jot.c
Bryan Drewery 814f2cd84c Fix 'jot -r 0 start end' to work. 
This allows an endless stream of random data within the given bounds.
It already worked if a seed was provided as the 4th argument but not
if one was left out.

In collaboration with:	jhb
MFC after:		2 weeks
Relnotes:		yes
2019-04-16 00:41:22 +00:00

518 lines
12 KiB
C
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)jot.c 8.1 (Berkeley) 6/6/93";
#endif
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* jot - print sequential or random data
*
* Author: John Kunze, Office of Comp. Affairs, UCB
*/
#include <sys/capsicum.h>
#include <capsicum_helpers.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
/* Defaults */
#define REPS_DEF 100
#define BEGIN_DEF 1
#define ENDER_DEF 100
#define STEP_DEF 1
/* Flags of options that have been set */
#define HAVE_STEP 1
#define HAVE_ENDER 2
#define HAVE_BEGIN 4
#define HAVE_REPS 8
#define is_default(s) (*(s) == 0 || strcmp((s), "-") == 0)
static bool boring;
static int prec = -1;
static bool longdata;
static bool intdata;
static bool chardata;
static bool nosign;
static const char *sepstring = "\n";
static char format[BUFSIZ];
static void getformat(void);
static int getprec(const char *);
static int putdata(double, bool);
static void usage(void);
int
main(int argc, char **argv)
{
cap_rights_t rights;
bool have_format = false;
bool infinity = false;
bool nofinalnl = false;
bool randomize = false;
bool use_random = false;
int ch;
int mask = 0;
int n = 0;
double begin = BEGIN_DEF;
double divisor;
double ender = ENDER_DEF;
double s = STEP_DEF;
double x, y;
long i;
long reps = REPS_DEF;
if (caph_limit_stdio() < 0)
err(1, "unable to limit rights for stdio");
cap_rights_init(&rights);
if (caph_rights_limit(STDIN_FILENO, &rights) < 0)
err(1, "unable to limit rights for stdin");
/*
* Cache NLS data, for strerror, for err(3), before entering capability
* mode.
*/
caph_cache_catpages();
if (caph_enter() < 0)
err(1, "unable to enter capability mode");
while ((ch = getopt(argc, argv, "b:cnp:rs:w:")) != -1)
switch (ch) {
case 'b':
boring = true;
/* FALLTHROUGH */
case 'w':
if (strlcpy(format, optarg, sizeof(format)) >=
sizeof(format))
errx(1, "-%c word too long", ch);
have_format = true;
break;
case 'c':
chardata = true;
break;
case 'n':
nofinalnl = true;
break;
case 'p':
prec = atoi(optarg);
if (prec < 0)
errx(1, "bad precision value");
have_format = true;
break;
case 'r':
randomize = true;
break;
case 's':
sepstring = optarg;
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 |= HAVE_STEP;
if (randomize)
use_random = true;
}
/* FALLTHROUGH */
case 3:
if (!is_default(argv[2])) {
if (!sscanf(argv[2], "%lf", &ender))
ender = argv[2][strlen(argv[2])-1];
mask |= HAVE_ENDER;
if (prec < 0)
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 |= HAVE_BEGIN;
if (prec < 0)
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 |= HAVE_REPS;
}
break;
case 0:
usage();
default:
errx(1, "too many arguments. What do you mean by %s?",
argv[4]);
}
getformat();
if (prec == -1)
prec = 0;
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 HAVE_STEP:
case HAVE_ENDER:
case HAVE_ENDER | HAVE_STEP:
case HAVE_BEGIN:
case HAVE_BEGIN | HAVE_STEP:
reps = REPS_DEF;
mask |= HAVE_REPS;
break;
case HAVE_BEGIN | HAVE_ENDER:
s = ender > begin ? 1 : -1;
mask |= HAVE_STEP;
break;
case HAVE_BEGIN | HAVE_ENDER | HAVE_STEP:
if (randomize)
reps = REPS_DEF;
else if (s == 0.0)
reps = 0;
else
reps = (ender - begin + s) / s;
if (reps <= 0)
errx(1, "impossible stepsize");
mask = 0;
break;
case HAVE_REPS:
case HAVE_REPS | HAVE_STEP:
begin = BEGIN_DEF;
mask |= HAVE_BEGIN;
break;
case HAVE_REPS | HAVE_ENDER:
s = STEP_DEF;
mask = HAVE_REPS | HAVE_ENDER | HAVE_STEP;
break;
case HAVE_REPS | HAVE_ENDER | HAVE_STEP:
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 HAVE_REPS | HAVE_BEGIN:
s = STEP_DEF;
mask = HAVE_REPS | HAVE_BEGIN | HAVE_STEP;
break;
case HAVE_REPS | HAVE_BEGIN | HAVE_STEP:
if (randomize)
ender = ENDER_DEF;
else
ender = begin + reps * s - s;
mask = 0;
break;
case HAVE_REPS | HAVE_BEGIN | HAVE_ENDER:
if (!randomize) {
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 HAVE_REPS | HAVE_BEGIN | HAVE_ENDER | HAVE_STEP:
/* 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 = true;
if (randomize) {
if (use_random) {
srandom((unsigned long)s);
divisor = (double)INT32_MAX + 1;
} else
divisor = (double)UINT32_MAX + 1;
/*
* Attempt to DWIM when the user has specified an
* integer range within that of the random number
* generator: distribute the numbers equally in
* the range [begin .. ender]. Jot's default %.0f
* format would make the appearance of the first and
* last specified value half as likely as the rest.
*/
if (!have_format && prec == 0 &&
begin >= 0 && begin < divisor &&
ender >= 0 && ender < divisor) {
if (begin <= ender)
ender += 1;
else
begin += 1;
nosign = true;
intdata = true;
(void)strlcpy(format,
chardata ? "%c" : "%u", sizeof(format));
}
x = ender - begin;
for (i = 1; i <= reps || infinity; i++) {
if (use_random)
y = random() / divisor;
else
y = arc4random() / divisor;
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);
}
/*
* Send x to stdout using the specified format.
* Last is true if this is the set's last value.
* Return 0 if OK, or a positive number if the number passed was
* outside the range specified by the various flags.
*/
static int
putdata(double x, bool last)
{
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 (!last)
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);
}
/*
* Return the number of digits following the number's decimal point.
* Return 0 if no decimal point is found.
*/
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((unsigned char)*p))
break;
return (p - q);
}
/*
* Set format, intdata, chardata, longdata, and nosign
* based on the command line arguments.
*/
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 == '%') {
if (p[1] == '%')
p++; /* leave %% alone */
else
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 = true;
} 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((unsigned char)*p)) {
if (isdigit((unsigned char)*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 = true;
if (*++p == 'l') {
if (p[1] != '\0')
p++;
goto fmt_broken;
}
}
switch (*p) {
case 'o': case 'u': case 'x': case 'X':
intdata = nosign = true;
break;
case 'd': case 'i':
intdata = true;
break;
case 'D':
if (!longdata) {
intdata = true;
break;
}
case 'O': case 'U':
if (!longdata) {
intdata = nosign = true;
break;
}
case 'c':
if (!(intdata | longdata)) {
chardata = true;
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)) {
if (strlcat(format, "%", sizeof(format)) >=
sizeof(format))
errx(1, "-w word too long");
break;
}
}
}
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