/* $NetBSD: seq.c,v 1.7 2010/05/27 08:40:19 dholland Exp $ */
/*
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Brian Ginsbach.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <math.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ZERO '0'
#define SPACE ' '
#define MAX(a, b) (((a) < (b))? (b) : (a))
#define ISSIGN(c) ((int)(c) == '-' || (int)(c) == '+')
#define ISEXP(c) ((int)(c) == 'e' || (int)(c) == 'E')
#define ISODIGIT(c) ((int)(c) >= '0' && (int)(c) <= '7')
/* Globals */
static const char *decimal_point = "."; /* default */
static char default_format[] = { "%g" }; /* default */
/* Prototypes */
static double e_atof(const char *);
static int decimal_places(const char *);
static int numeric(const char *);
static int valid_format(const char *);
static char *generate_format(double, double, double, int, char);
static char *unescape(char *);
/*
* The seq command will print out a numeric sequence from 1, the default,
* to a user specified upper limit by 1. The lower bound and increment
* maybe indicated by the user on the command line. The sequence can
* be either whole, the default, or decimal numbers.
*/
int
main(int argc, char *argv[])
{
int c = 0, errflg = 0;
int equalize = 0;
double first = 1.0;
double last = 0.0;
double incr = 0.0;
struct lconv *locale;
char *fmt = NULL;
const char *sep = "\n";
const char *term = NULL;
char pad = ZERO;
/* Determine the locale's decimal point. */
locale = localeconv();
if (locale && locale->decimal_point && locale->decimal_point[0] != '\0')
decimal_point = locale->decimal_point;
/*
* Process options, but handle negative numbers separately
* least they trip up getopt(3).
*/
while ((optind < argc) && !numeric(argv[optind]) &&
(c = getopt(argc, argv, "f:hs:t:w")) != -1) {
switch (c) {
case 'f': /* format (plan9) */
fmt = optarg;
equalize = 0;
break;
case 's': /* separator (GNU) */
sep = unescape(optarg);
break;
case 't': /* terminator (new) */
term = unescape(optarg);
break;
case 'w': /* equal width (plan9) */
if (!fmt)
if (equalize++)
pad = SPACE;
break;
case 'h': /* help (GNU) */
default:
errflg++;
break;
}
}
argc -= optind;
argv += optind;
if (argc < 1 || argc > 3)
errflg++;
if (errflg) {
fprintf(stderr,
"usage: %s [-w] [-f format] [-s string] [-t string] [first [incr]] last\n",
getprogname());
exit(1);
}
last = e_atof(argv[argc - 1]);
if (argc > 1)
first = e_atof(argv[0]);
if (argc > 2) {
incr = e_atof(argv[1]);
/* Plan 9/GNU don't do zero */
if (incr == 0.0)
errx(1, "zero %screment", (first < last)? "in" : "de");
}
/* default is one for Plan 9/GNU work alike */
if (incr == 0.0)
incr = (first < last) ? 1.0 : -1.0;
if (incr <= 0.0 && first < last)
errx(1, "needs positive increment");
if (incr >= 0.0 && first > last)
errx(1, "needs negative decrement");
if (fmt != NULL) {
if (!valid_format(fmt))
errx(1, "invalid format string: `%s'", fmt);
fmt = unescape(fmt);
if (!valid_format(fmt))
errx(1, "invalid format string");
/*
* XXX to be bug for bug compatible with Plan 9 add a
* newline if none found at the end of the format string.
*/
} else
fmt = generate_format(first, incr, last, equalize, pad);
if (incr > 0) {
for (; first <= last; first += incr) {
printf(fmt, first);
fputs(sep, stdout);
}
} else {
for (; first >= last; first += incr) {
printf(fmt, first);
fputs(sep, stdout);
}
}
if (term != NULL)
fputs(term, stdout);
return (0);
}
/*
* numeric - verify that string is numeric
*/
static int
numeric(const char *s)
{
int seen_decimal_pt, decimal_pt_len;
/* skip any sign */
if (ISSIGN((unsigned char)*s))
s++;
seen_decimal_pt = 0;
decimal_pt_len = strlen(decimal_point);
while (*s) {
if (!isdigit((unsigned char)*s)) {
if (!seen_decimal_pt &&
strncmp(s, decimal_point, decimal_pt_len) == 0) {
s += decimal_pt_len;
seen_decimal_pt = 1;
continue;
}
if (ISEXP((unsigned char)*s)) {
s++;
if (ISSIGN((unsigned char)*s) ||
isdigit((unsigned char)*s)) {
s++;
continue;
}
}
break;
}
s++;
}
return (*s == '\0');
}
/*
* valid_format - validate user specified format string
*/
static int
valid_format(const char *fmt)
{
unsigned conversions = 0;
while (*fmt != '\0') {
/* scan for conversions */
if (*fmt != '%') {
fmt++;
continue;
}
fmt++;
/* allow %% but not things like %10% */
if (*fmt == '%') {
fmt++;
continue;
}
/* flags */
while (*fmt != '\0' && strchr("#0- +'", *fmt)) {
fmt++;
}
/* field width */
while (*fmt != '\0' && strchr("0123456789", *fmt)) {
fmt++;
}
/* precision */
if (*fmt == '.') {
fmt++;
while (*fmt != '\0' && strchr("0123456789", *fmt)) {
fmt++;
}
}
/* conversion */
switch (*fmt) {
case 'A':
case 'a':
case 'E':
case 'e':
case 'F':
case 'f':
case 'G':
case 'g':
/* floating point formats are accepted */
conversions++;
break;
default:
/* anything else is not */
return 0;
}
}
return (conversions <= 1);
}
/*
* unescape - handle C escapes in a string
*/
static char *
unescape(char *orig)
{
char c, *cp, *new = orig;
int i;
for (cp = orig; (*orig = *cp); cp++, orig++) {
if (*cp != '\\')
continue;
switch (*++cp) {
case 'a': /* alert (bell) */
*orig = '\a';
continue;
case 'b': /* backspace */
*orig = '\b';
continue;
case 'e': /* escape */
*orig = '\e';
continue;
case 'f': /* formfeed */
*orig = '\f';
continue;
case 'n': /* newline */
*orig = '\n';
continue;
case 'r': /* carriage return */
*orig = '\r';
continue;
case 't': /* horizontal tab */
*orig = '\t';
continue;
case 'v': /* vertical tab */
*orig = '\v';
continue;
case '\\': /* backslash */
*orig = '\\';
continue;
case '\'': /* single quote */
*orig = '\'';
continue;
case '\"': /* double quote */
*orig = '"';
continue;
case '0':
case '1':
case '2':
case '3': /* octal */
case '4':
case '5':
case '6':
case '7': /* number */
for (i = 0, c = 0;
ISODIGIT((unsigned char)*cp) && i < 3;
i++, cp++) {
c <<= 3;
c |= (*cp - '0');
}
*orig = c;
--cp;
continue;
case 'x': /* hexadecimal number */
cp++; /* skip 'x' */
for (i = 0, c = 0;
isxdigit((unsigned char)*cp) && i < 2;
i++, cp++) {
c <<= 4;
if (isdigit((unsigned char)*cp))
c |= (*cp - '0');
else
c |= ((toupper((unsigned char)*cp) -
'A') + 10);
}
*orig = c;
--cp;
continue;
default:
--cp;
break;
}
}
return (new);
}
/*
* e_atof - convert an ASCII string to a double
* exit if string is not a valid double, or if converted value would
* cause overflow or underflow
*/
static double
e_atof(const char *num)
{
char *endp;
double dbl;
errno = 0;
dbl = strtod(num, &endp);
if (errno == ERANGE)
/* under or overflow */
err(2, "%s", num);
else if (*endp != '\0')
/* "junk" left in number */
errx(2, "invalid floating point argument: %s", num);
/* zero shall have no sign */
if (dbl == -0.0)
dbl = 0;
return (dbl);
}
/*
* decimal_places - count decimal places in a number (string)
*/
static int
decimal_places(const char *number)
{
int places = 0;
char *dp;
/* look for a decimal point */
if ((dp = strstr(number, decimal_point))) {
dp += strlen(decimal_point);
while (isdigit((unsigned char)*dp++))
places++;
}
return (places);
}
/*
* generate_format - create a format string
*
* XXX to be bug for bug compatible with Plan9 and GNU return "%g"
* when "%g" prints as "%e" (this way no width adjustments are made)
*/
static char *
generate_format(double first, double incr, double last, int equalize, char pad)
{
static char buf[256];
char cc = '\0';
int precision, width1, width2, places;
if (equalize == 0)
return (default_format);
/* figure out "last" value printed */
if (first > last)
last = first - incr * floor((first - last) / incr);
else
last = first + incr * floor((last - first) / incr);
sprintf(buf, "%g", incr);
if (strchr(buf, 'e'))
cc = 'e';
precision = decimal_places(buf);
width1 = sprintf(buf, "%g", first);
if (strchr(buf, 'e'))
cc = 'e';
if ((places = decimal_places(buf)))
width1 -= (places + strlen(decimal_point));
precision = MAX(places, precision);
width2 = sprintf(buf, "%g", last);
if (strchr(buf, 'e'))
cc = 'e';
if ((places = decimal_places(buf)))
width2 -= (places + strlen(decimal_point));
if (precision) {
sprintf(buf, "%%%c%d.%d%c", pad,
MAX(width1, width2) + (int) strlen(decimal_point) +
precision, precision, (cc) ? cc : 'f');
} else {
sprintf(buf, "%%%c%d%c", pad, MAX(width1, width2),
(cc) ? cc : 'g');
}
return (buf);
}
