+/* $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: src/usr.bin/seq/seq.c,v 1.2 2010/02/20 01:23:15 delphij Exp $");
+
+#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 precsision */
+ 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': /* hexidecimal 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 compatable 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);
+}
projects / apple / shell_cmds.git / commitdiff
