source: branches/3.2/mindi-busybox/coreutils/seq.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.4 KB
Line 
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
22int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
23int 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}
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