/* seq.c - Count from first to last, by increment. * * Copyright 2006 Rob Landley <rob@landley.net> * * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/seq.html USE_SEQ(NEWTOY(seq, "<1>3?f:s:", TOYFLAG_USR|TOYFLAG_BIN)) config SEQ bool "seq" depends on TOYBOX_FLOAT default y help usage: seq [-f fmt_str] [-s sep_str] [first] [increment] last Count from first to last, by increment. Omitted arguments default to 1. Two arguments are used as first and last. Arguments can be negative or floating point. -f Use fmt_str as a floating point format string -s Use sep_str as separator, default is a newline character */ #define FOR_seq #include "toys.h" GLOBALS( char *sep; char *fmt; ) void seq_main(void) { double first, increment, last, dd; char *sep_str = "\n"; char *fmt_str = "%g"; int output = 0; // Parse command line arguments, with appropriate defaults. // Note that any non-numeric arguments are treated as zero. first = increment = 1; switch (toys.optc) { case 3: increment = atof(toys.optargs[1]); case 2: first = atof(*toys.optargs); default: last = atof(toys.optargs[toys.optc-1]); } if (toys.optflags & FLAG_f) fmt_str = TT.fmt; if (toys.optflags & FLAG_s) sep_str = TT.sep; // Yes, we're looping on a double. Yes rounding errors can accumulate if // you use a non-integer increment. Deal with it. for (dd=first; (increment>0 && dd<=last) || (increment<0 && dd>=last); dd+=increment) { if (dd != first) printf("%s", sep_str); printf(fmt_str, dd); output = 1; } if (output) printf("\n"); }