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https://git.busybox.net/busybox.git
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143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* seq implementation for busybox
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*
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* Copyright (C) 2004, Glenn McGrath
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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//config:config SEQ
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//config: bool "seq (4 kb)"
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//config: default y
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//config: help
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//config: print a sequence of numbers
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//applet:IF_SEQ(APPLET_NOEXEC(seq, seq, BB_DIR_USR_BIN, BB_SUID_DROP, seq))
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/* was NOFORK, but then "seq 1 999999999" can't be ^C'ed if run by hush */
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//kbuild:lib-$(CONFIG_SEQ) += seq.o
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//usage:#define seq_trivial_usage
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//usage: "[-w] [-s SEP] [FIRST [INC]] LAST"
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//usage:#define seq_full_usage "\n\n"
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//usage: "Print numbers from FIRST to LAST, in steps of INC.\n"
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//usage: "FIRST, INC default to 1.\n"
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//usage: "\n -w Pad with leading zeros"
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//usage: "\n -s SEP String separator"
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#include "libbb.h"
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/* This is a NOEXEC applet. Be very careful! */
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int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int seq_main(int argc, char **argv)
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{
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enum {
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OPT_w = (1 << 0),
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OPT_s = (1 << 1),
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};
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double first, last, increment, v;
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unsigned n;
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unsigned width;
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unsigned frac_part;
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const char *sep, *opt_s = "\n";
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char *saved;
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unsigned opt;
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#if ENABLE_LOCALE_SUPPORT
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/* Undo busybox.c: on input, we want to use dot
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* as fractional separator, regardless of current locale */
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setlocale(LC_NUMERIC, "C");
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#endif
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/* Cater for negative arguments: if we see one, truncate argv[] on it */
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n = 0;
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for (;;) {
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char c;
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saved = argv[++n];
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if (!saved)
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break;
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if (saved[0] != '-') {
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// break; // "seq -s : -1 1" won't be treated correctly
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continue;
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}
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// "seq -s -1 1 9" is not treated correctly, but such usage
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// (delimiter string which looks like negative number) is very unlikely
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c = saved[1];
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if (c == '.' || (c >= '0' && c <= '9')) {
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argv[n] = NULL;
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break;
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}
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}
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opt = getopt32(argv, "+ws:", &opt_s); /* "+": stop at first non-option */
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/* Restore possibly truncated argv[] */
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argv[n] = saved;
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argc -= optind;
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argv += optind;
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first = increment = 1;
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errno = 0;
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switch (argc) {
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char *pp;
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case 3:
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increment = strtod(argv[1], &pp);
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errno |= *pp;
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case 2:
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first = strtod(argv[0], &pp);
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errno |= *pp;
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case 1:
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last = strtod(argv[argc-1], &pp);
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if (!errno && *pp == '\0')
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break;
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default:
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bb_show_usage();
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}
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#if ENABLE_LOCALE_SUPPORT
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setlocale(LC_NUMERIC, "");
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#endif
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/* Last checked to be compatible with: coreutils-6.10 */
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width = 0;
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frac_part = 0;
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while (1) {
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char *dot = strchrnul(*argv, '.');
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int w = (dot - *argv);
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int f = strlen(dot);
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if (width < w)
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width = w;
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argv++;
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if (!*argv)
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break;
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/* Why do the above _before_ frac check below?
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* Try "seq 1 2.0" and "seq 1.0 2.0":
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* coreutils never pay attention to the number
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* of fractional digits in last arg. */
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if (frac_part < f)
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frac_part = f;
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}
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if (frac_part) {
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frac_part--;
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if (frac_part)
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width += frac_part + 1;
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}
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if (!(opt & OPT_w))
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width = 0;
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sep = "";
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v = first;
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n = 0;
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while (increment >= 0 ? v <= last : v >= last) {
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if (printf("%s%0*.*f", sep, width, frac_part, v) < 0)
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break; /* I/O error, bail out (yes, this really happens) */
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sep = opt_s;
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/* v += increment; - would accumulate floating point errors */
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n++;
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v = first + n * increment;
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}
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if (n) /* if while loop executed at least once */
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bb_putchar('\n');
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return fflush_all();
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}
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