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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