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