| 1 | /* vi: set sw=4 ts=4: */
|
|---|
| 2 | /*
|
|---|
| 3 | * seq implementation for busybox
|
|---|
| 4 | *
|
|---|
| 5 | * Copyright (C) 2004, Glenn McGrath
|
|---|
| 6 | *
|
|---|
| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
|---|
| 8 | */
|
|---|
| 9 |
|
|---|
| 10 | //usage:#define seq_trivial_usage
|
|---|
| 11 | //usage: "[-w] [-s SEP] [FIRST [INC]] LAST"
|
|---|
| 12 | //usage:#define seq_full_usage "\n\n"
|
|---|
| 13 | //usage: "Print numbers from FIRST to LAST, in steps of INC.\n"
|
|---|
| 14 | //usage: "FIRST, INC default to 1.\n"
|
|---|
| 15 | //usage: "\n -w Pad to last with leading zeros"
|
|---|
| 16 | //usage: "\n -s SEP String separator"
|
|---|
| 17 |
|
|---|
| 18 | #include "libbb.h"
|
|---|
| 19 |
|
|---|
| 20 | /* This is a NOFORK applet. Be very careful! */
|
|---|
| 21 |
|
|---|
| 22 | int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|---|
| 23 | int seq_main(int argc, char **argv)
|
|---|
| 24 | {
|
|---|
| 25 | enum {
|
|---|
| 26 | OPT_w = (1 << 0),
|
|---|
| 27 | OPT_s = (1 << 1),
|
|---|
| 28 | };
|
|---|
| 29 | double first, last, increment, v;
|
|---|
| 30 | unsigned n;
|
|---|
| 31 | unsigned width;
|
|---|
| 32 | unsigned frac_part;
|
|---|
| 33 | const char *sep, *opt_s = "\n";
|
|---|
| 34 | unsigned opt;
|
|---|
| 35 |
|
|---|
| 36 | #if ENABLE_LOCALE_SUPPORT
|
|---|
| 37 | /* Undo busybox.c: on input, we want to use dot
|
|---|
| 38 | * as fractional separator, regardless of current locale */
|
|---|
| 39 | setlocale(LC_NUMERIC, "C");
|
|---|
| 40 | #endif
|
|---|
| 41 |
|
|---|
| 42 | opt = getopt32(argv, "+ws:", &opt_s);
|
|---|
| 43 | argc -= optind;
|
|---|
| 44 | argv += optind;
|
|---|
| 45 | first = increment = 1;
|
|---|
| 46 | errno = 0;
|
|---|
| 47 | switch (argc) {
|
|---|
| 48 | char *pp;
|
|---|
| 49 | case 3:
|
|---|
| 50 | increment = strtod(argv[1], &pp);
|
|---|
| 51 | errno |= *pp;
|
|---|
| 52 | case 2:
|
|---|
| 53 | first = strtod(argv[0], &pp);
|
|---|
| 54 | errno |= *pp;
|
|---|
| 55 | case 1:
|
|---|
| 56 | last = strtod(argv[argc-1], &pp);
|
|---|
| 57 | if (!errno && *pp == '\0')
|
|---|
| 58 | break;
|
|---|
| 59 | default:
|
|---|
| 60 | bb_show_usage();
|
|---|
| 61 | }
|
|---|
| 62 |
|
|---|
| 63 | #if ENABLE_LOCALE_SUPPORT
|
|---|
| 64 | setlocale(LC_NUMERIC, "");
|
|---|
| 65 | #endif
|
|---|
| 66 |
|
|---|
| 67 | /* Last checked to be compatible with: coreutils-6.10 */
|
|---|
| 68 | width = 0;
|
|---|
| 69 | frac_part = 0;
|
|---|
| 70 | while (1) {
|
|---|
| 71 | char *dot = strchrnul(*argv, '.');
|
|---|
| 72 | int w = (dot - *argv);
|
|---|
| 73 | int f = strlen(dot);
|
|---|
| 74 | if (width < w)
|
|---|
| 75 | width = w;
|
|---|
| 76 | argv++;
|
|---|
| 77 | if (!*argv)
|
|---|
| 78 | break;
|
|---|
| 79 | /* Why do the above _before_ frac check below?
|
|---|
| 80 | * Try "seq 1 2.0" and "seq 1.0 2.0":
|
|---|
| 81 | * coreutils never pay attention to the number
|
|---|
| 82 | * of fractional digits in last arg. */
|
|---|
| 83 | if (frac_part < f)
|
|---|
| 84 | frac_part = f;
|
|---|
| 85 | }
|
|---|
| 86 | if (frac_part) {
|
|---|
| 87 | frac_part--;
|
|---|
| 88 | if (frac_part)
|
|---|
| 89 | width += frac_part + 1;
|
|---|
| 90 | }
|
|---|
| 91 | if (!(opt & OPT_w))
|
|---|
| 92 | width = 0;
|
|---|
| 93 |
|
|---|
| 94 | sep = "";
|
|---|
| 95 | v = first;
|
|---|
| 96 | n = 0;
|
|---|
| 97 | while (increment >= 0 ? v <= last : v >= last) {
|
|---|
| 98 | if (printf("%s%0*.*f", sep, width, frac_part, v) < 0)
|
|---|
| 99 | break; /* I/O error, bail out (yes, this really happens) */
|
|---|
| 100 | sep = opt_s;
|
|---|
| 101 | /* v += increment; - would accumulate floating point errors */
|
|---|
| 102 | n++;
|
|---|
| 103 | v = first + n * increment;
|
|---|
| 104 | }
|
|---|
| 105 | if (n) /* if while loop executed at least once */
|
|---|
| 106 | bb_putchar('\n');
|
|---|
| 107 |
|
|---|
| 108 | return fflush_all();
|
|---|
| 109 | }
|
|---|
