/*
 * seq:  dump a sequence of <things> to stdout, one per line.
 *       idea by Kernighan & Pike, in _The UNIX Programming Environment_,
 *       filtered through Copeland & Haemer, in _Server/Workstation
 *       Expert_ (Vol 11 #2) as a perl program.
 *
 * Public domain, written by orc@pell.chi.il.us (jessica l. parsons), who would
 * like to receive millions of dollars every time this code is used, but,
 * hey!, it's completely free.
 */
#include <stdio.h>
#include <unistd.h>

char *pgm;

void
seq(char *low, char *high)
{
    /* A clever implementation of this would do sequencing of non-numeric
     * arguments.  But that would take time and energy to do.
     */
    unsigned long lownum = atoi(low);
    unsigned long highnum = atoi(high);

    while (lownum <= highnum)
	printf("%ld\n", lownum++);
}

void
main(int argc, char **argv)
{
    char *p;

    pgm = basename(argv[0]);

    if (argc < 2 || argc > 3) {
	fprintf(stderr, "usage: %s range\n"
			"       %s low high\n", pgm, pgm);
	exit(1);
    }
    switch (argc) {
    case 2:
	    seq("1",argv[1]);
	    break;
    case 3:
	    seq(argv[1], argv[2]);
	    break;
    }
    exit (0);
}