source: branches/2.2.9/mindi-busybox/coreutils/seq.c

Last change on this file was 3320, checked in by bruno, 5 years ago
  • Re-add (thanks git BTW) the 2.2.9 branch which had been destroyed in the move to 3.0
  • Property svn:eol-style set to native
File size: 2.1 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#include "libbb.h"
10
11/* This is a NOFORK applet. Be very careful! */
12
13int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
14int seq_main(int argc, char **argv)
15{
16    enum {
17        OPT_w = (1 << 0),
18        OPT_s = (1 << 1),
19    };
20    double first, last, increment, v;
21    unsigned n;
22    unsigned width;
23    unsigned frac_part;
24    const char *sep, *opt_s = "\n";
25    unsigned opt;
26
27#if ENABLE_LOCALE_SUPPORT
28    /* Undo busybox.c: on input, we want to use dot
29     * as fractional separator, regardless of current locale */
30    setlocale(LC_NUMERIC, "C");
31#endif
32
33    opt = getopt32(argv, "+ws:", &opt_s);
34    argc -= optind;
35    argv += optind;
36    first = increment = 1;
37    errno = 0;
38    switch (argc) {
39            char *pp;
40        case 3:
41            increment = strtod(argv[1], &pp);
42            errno |= *pp;
43        case 2:
44            first = strtod(argv[0], &pp);
45            errno |= *pp;
46        case 1:
47            last = strtod(argv[argc-1], &pp);
48            if (!errno && *pp == '\0')
49                break;
50        default:
51            bb_show_usage();
52    }
53
54#if ENABLE_LOCALE_SUPPORT
55    setlocale(LC_NUMERIC, "");
56#endif
57
58    /* Last checked to be compatible with: coreutils-6.10 */
59    width = 0;
60    frac_part = 0;
61    while (1) {
62        char *dot = strchrnul(*argv, '.');
63        int w = (dot - *argv);
64        int f = strlen(dot);
65        if (width < w)
66            width = w;
67        argv++;
68        if (!*argv)
69            break;
70        /* Why do the above _before_ frac check below?
71         * Try "seq 1 2.0" and "seq 1.0 2.0":
72         * coreutils never pay attention to the number
73         * of fractional digits in last arg. */
74        if (frac_part < f)
75            frac_part = f;
76    }
77    if (frac_part) {
78        frac_part--;
79        if (frac_part)
80            width += frac_part + 1;
81    }
82    if (!(opt & OPT_w))
83        width = 0;
84
85    sep = "";
86    v = first;
87    n = 0;
88    while (increment >= 0 ? v <= last : v >= last) {
89        if (printf("%s%0*.*f", sep, width, frac_part, v) < 0)
90            break; /* I/O error, bail out (yes, this really happens) */
91        sep = opt_s;
92        /* v += increment; - would accumulate floating point errors */
93        n++;
94        v = first + n * increment;
95    }
96    if (n) /* if while loop executed at least once */
97        bb_putchar('\n');
98
99    return fflush_all();
100}
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