| /* vi: set sw=4 ts=4: */ |
| /* |
| * seq implementation for busybox |
| * |
| * Copyright (C) 2004, Glenn McGrath |
| * |
| * Licensed under GPLv2, see file LICENSE in this source tree. |
| */ |
| //config:config SEQ |
| //config: bool "seq" |
| //config: default y |
| //config: help |
| //config: print a sequence of numbers |
| |
| //applet:IF_SEQ(APPLET_NOFORK(seq, seq, BB_DIR_USR_BIN, BB_SUID_DROP, seq)) |
| |
| //kbuild:lib-$(CONFIG_SEQ) += seq.o |
| |
| //usage:#define seq_trivial_usage |
| //usage: "[-w] [-s SEP] [FIRST [INC]] LAST" |
| //usage:#define seq_full_usage "\n\n" |
| //usage: "Print numbers from FIRST to LAST, in steps of INC.\n" |
| //usage: "FIRST, INC default to 1.\n" |
| //usage: "\n -w Pad to last with leading zeros" |
| //usage: "\n -s SEP String separator" |
| |
| #include "libbb.h" |
| |
| /* This is a NOFORK applet. Be very careful! */ |
| |
| int seq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int seq_main(int argc, char **argv) |
| { |
| enum { |
| OPT_w = (1 << 0), |
| OPT_s = (1 << 1), |
| }; |
| double first, last, increment, v; |
| unsigned n; |
| unsigned width; |
| unsigned frac_part; |
| const char *sep, *opt_s = "\n"; |
| unsigned opt; |
| |
| #if ENABLE_LOCALE_SUPPORT |
| /* Undo busybox.c: on input, we want to use dot |
| * as fractional separator, regardless of current locale */ |
| setlocale(LC_NUMERIC, "C"); |
| #endif |
| |
| opt = getopt32(argv, "+ws:", &opt_s); |
| argc -= optind; |
| argv += optind; |
| first = increment = 1; |
| errno = 0; |
| switch (argc) { |
| char *pp; |
| case 3: |
| increment = strtod(argv[1], &pp); |
| errno |= *pp; |
| case 2: |
| first = strtod(argv[0], &pp); |
| errno |= *pp; |
| case 1: |
| last = strtod(argv[argc-1], &pp); |
| if (!errno && *pp == '\0') |
| break; |
| default: |
| bb_show_usage(); |
| } |
| |
| #if ENABLE_LOCALE_SUPPORT |
| setlocale(LC_NUMERIC, ""); |
| #endif |
| |
| /* Last checked to be compatible with: coreutils-6.10 */ |
| width = 0; |
| frac_part = 0; |
| while (1) { |
| char *dot = strchrnul(*argv, '.'); |
| int w = (dot - *argv); |
| int f = strlen(dot); |
| if (width < w) |
| width = w; |
| argv++; |
| if (!*argv) |
| break; |
| /* Why do the above _before_ frac check below? |
| * Try "seq 1 2.0" and "seq 1.0 2.0": |
| * coreutils never pay attention to the number |
| * of fractional digits in last arg. */ |
| if (frac_part < f) |
| frac_part = f; |
| } |
| if (frac_part) { |
| frac_part--; |
| if (frac_part) |
| width += frac_part + 1; |
| } |
| if (!(opt & OPT_w)) |
| width = 0; |
| |
| sep = ""; |
| v = first; |
| n = 0; |
| while (increment >= 0 ? v <= last : v >= last) { |
| if (printf("%s%0*.*f", sep, width, frac_part, v) < 0) |
| break; /* I/O error, bail out (yes, this really happens) */ |
| sep = opt_s; |
| /* v += increment; - would accumulate floating point errors */ |
| n++; |
| v = first + n * increment; |
| } |
| if (n) /* if while loop executed at least once */ |
| bb_putchar('\n'); |
| |
| return fflush_all(); |
| } |