454 lines
9.9 KiB
C
454 lines
9.9 KiB
C
/* $NetBSD: seq.c,v 1.5 2008/07/21 14:19:26 lukem 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 */
|
|
|
|
const char *decimal_point = "."; /* default */
|
|
char default_format[] = { "%g" }; /* default */
|
|
|
|
/* Prototypes */
|
|
|
|
double e_atof(const char *);
|
|
|
|
int decimal_places(const char *);
|
|
int main(int, char *[]);
|
|
int numeric(const char *);
|
|
int valid_format(const char *);
|
|
|
|
char *generate_format(double, double, double, int, char);
|
|
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);
|
|
/*
|
|
* 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
|
|
*/
|
|
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
|
|
*/
|
|
int
|
|
valid_format(const char *fmt)
|
|
{
|
|
int conversions = 0;
|
|
|
|
while (*fmt != '\0') {
|
|
/* scan for conversions */
|
|
if (*fmt != '\0' && *fmt != '%') {
|
|
do {
|
|
fmt++;
|
|
} while (*fmt != '\0' && *fmt != '%');
|
|
}
|
|
/* scan a conversion */
|
|
if (*fmt != '\0') {
|
|
do {
|
|
fmt++;
|
|
|
|
/* ok %% */
|
|
if (*fmt == '%') {
|
|
fmt++;
|
|
break;
|
|
}
|
|
/* valid conversions */
|
|
if (strchr("eEfgG", *fmt) &&
|
|
conversions++ < 1) {
|
|
fmt++;
|
|
break;
|
|
}
|
|
/* flags, width and precision */
|
|
if (isdigit((unsigned char)*fmt) ||
|
|
strchr("+- 0#.", *fmt))
|
|
continue;
|
|
|
|
/* oops! bad conversion format! */
|
|
return (0);
|
|
} while (*fmt != '\0');
|
|
}
|
|
}
|
|
|
|
return (conversions <= 1);
|
|
}
|
|
|
|
/*
|
|
* unescape - handle C escapes in a string
|
|
*/
|
|
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
|
|
*/
|
|
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)
|
|
*/
|
|
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)
|
|
*/
|
|
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);
|
|
}
|