Contents of /trunk/mkinitrd-magellan/busybox/coreutils/seq.c
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Revision 984 -
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 2083 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * seq implementation for busybox |
4 | * |
5 | * Copyright (C) 2004, Glenn McGrath |
6 | * |
7 | * Licensed under the GPL v2, see the file LICENSE in this tarball. |
8 | */ |
9 | #include "libbb.h" |
10 | |
11 | /* This is a NOFORK applet. Be very careful! */ |
12 | |
13 | int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
14 | int 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 | printf("%s%0*.*f", sep, width, frac_part, v); |
90 | sep = opt_s; |
91 | /* v += increment; - would accumulate floating point errors */ |
92 | n++; |
93 | v = first + n * increment; |
94 | } |
95 | if (n) /* if while loop executed at least once */ |
96 | bb_putchar('\n'); |
97 | |
98 | return fflush_all(); |
99 | } |