1 /* seq - print sequence of numbers to standard output.
2 Copyright (C) 1994-1999 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by Ulrich Drepper. */
24 #include <sys/types.h>
30 static double scan_double_arg PARAMS ((const char *arg));
31 static int check_format PARAMS ((const char *format_string));
32 static char *get_width_format PARAMS ((void));
33 static int print_numbers PARAMS ((const char *format_str));
35 /* If nonzero print all number with equal width. */
36 static int equal_width;
38 /* The printf(3) format used for output. */
39 static char *format_str;
41 /* The starting number. */
44 /* The name that this program was run with. */
47 /* The string used to separate two numbers. */
48 static char *separator;
50 /* The string output after all numbers have been output.
51 Usually "\n" or "\0". */
52 /* FIXME: make this an option. */
53 static char *terminator = "\n";
55 /* If nonzero, display usage information and exit. */
58 /* If nonzero, print the version on standard output and exit. */
59 static int show_version;
64 /* The last number. */
67 static struct option const long_options[] =
69 { "equal-width", no_argument, NULL, 'w'},
70 { "format", required_argument, NULL, 'f'},
71 { "help", no_argument, &show_help, 1},
72 { "separator", required_argument, NULL, 's'},
73 { "version", no_argument, &show_version, 1},
81 fprintf (stderr, _("Try `%s --help' for more information.\n"),
86 Usage: %s [OPTION]... LAST\n\
87 or: %s [OPTION]... FIRST LAST\n\
88 or: %s [OPTION]... FIRST INCREMENT LAST\n\
89 "), program_name, program_name, program_name);
91 Print numbers from FIRST to LAST, in steps of INCREMENT.\n\
93 -f, --format FORMAT use printf(3) style FORMAT (default: %%g)\n\
94 -s, --separator STRING use STRING to separate numbers (default: \\n)\n\
95 -w, --equal-width equalize width by padding with leading zeroes\n\
96 --help display this help and exit\n\
97 --version output version information and exit\n\
99 If FIRST or INCREMENT is omitted, it defaults to 1.\n\
100 FIRST, INCREMENT, and LAST are interpreted as floating point values.\n\
101 INCREMENT should be positive if FIRST is smaller than LAST, and negative\n\
102 otherwise. When given, the FORMAT argument must contain exactly one of\n\
103 the printf-style, floating point output formats %%e, %%f, or %%g.\n\
105 puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
111 main (int argc, char **argv)
117 program_name = argv[0];
118 setlocale (LC_ALL, "");
119 bindtextdomain (PACKAGE, LOCALEDIR);
120 textdomain (PACKAGE);
128 /* We have to handle negative numbers in the command line but this
129 conflicts with the command line arguments. So the getopt mode is
130 REQUIRE_ORDER (the '+' in the format string) and it abort on the
131 first non-option or negative number. */
132 while ((optc = getopt_long (argc, argv, "+0123456789f:s:w", long_options,
135 if ('0' <= optc && optc <= '9')
137 /* means negative number */
167 printf ("seq (%s) %s\n", GNU_PACKAGE, VERSION);
179 error (0, 0, _("too few arguments"));
183 last = scan_double_arg (argv[optind++]);
188 last = scan_double_arg (argv[optind++]);
194 last = scan_double_arg (argv[optind++]);
204 if (format_str != NULL && equal_width)
207 format string may not be specified when printing equal width strings"));
213 step = first <= last ? 1.0 : -1.0;
216 if (format_str != NULL)
218 if (!check_format (format_str))
220 error (0, 0, _("invalid format string: `%s'"), format_str);
227 format_str = get_width_format ();
232 errs = print_numbers (format_str);
238 /* Read a double value from the command line.
239 Return if the string is correct else signal error. */
242 scan_double_arg (const char *arg)
246 if (xstrtod (arg, NULL, &ret_val))
248 error (0, 0, _("invalid floating point argument: %s"), arg);
256 /* Check whether the format string is valid for a single double
258 Return 0 if not, 1 if correct. */
261 check_format (const char *fmt)
277 fmt += strspn (fmt, "-+#0");
280 fmt += strspn (fmt, "0123456789");
283 fmt += strspn (++fmt, "0123456789");
286 if (*fmt != 'e' && *fmt != 'f' && *fmt != 'g')
305 #if defined (HAVE_RINT) && defined (HAVE_MODF) && defined (HAVE_FLOOR)
307 /* Return a printf-style format string with which all selected numbers
308 will format to strings of the same width. */
313 static char buffer[256];
323 min_val = first - step * floor ((first - last) / step);
329 max_val = first + step * floor ((last - first) / step);
332 sprintf (buffer, "%g", rint (max_val));
333 if (buffer[strspn (buffer, "0123456789")] != '\0')
335 width1 = strlen (buffer);
339 sprintf (buffer, "%g", rint (min_val));
340 if (buffer[strspn (buffer, "-0123456789")] != '\0')
342 width2 = strlen (buffer);
344 width1 = width1 > width2 ? width1 : width2;
348 sprintf (buffer, "%g", 1.0 + modf (min_val, &temp));
349 width1 = strlen (buffer);
354 if (buffer[0] != '1' || buffer[1] != '.' ||
355 buffer[2 + strspn (&buffer[2], "0123456789")] != '\0')
360 sprintf (buffer, "%g", 1.0 + modf (step, &temp));
361 width2 = strlen (buffer);
366 if (buffer[0] != '1' || buffer[1] != '.' ||
367 buffer[2 + strspn (&buffer[2], "0123456789")] != '\0')
371 frac_width = width1 > width2 ? width1 : width2;
374 sprintf (buffer, "%%0%d.%df", full_width + 1 + frac_width, frac_width);
376 sprintf (buffer, "%%0%dg", full_width);
381 #else /* one of the math functions rint, modf, floor is missing. */
384 get_width_format (void)
386 /* We cannot compute the needed information to determine the correct
387 answer. So we simply return a value that works for all cases. */
393 /* Actually print the sequence of numbers in the specified range, with the
394 given or default stepping and format. */
396 print_numbers (const char *fmt)
405 _("when the starting value is larger than the limit,\n\
406 the increment must be negative"));
412 for (i = 1; /* empty */; i++)
414 double x = first + i * step;
419 fputs (separator, stdout);
430 _("when the starting value is smaller than the limit,\n\
431 the increment must be positive"));
437 for (i = 1; /* empty */; i++)
439 double x = first + i * step;
444 fputs (separator, stdout);
445 printf (format_str, x);
448 fputs (terminator, stdout);