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/*
NAME
chargen - generate a stream of characters
SYNOPSIS
chargen [-c C] [-l LEN] [-p] [-s N]
DESCRIPTION
Produces on standard output a stream of characters. The stream consists
of all 256 characters repeated cyclically until total number of characters
reaches 4096 (or LEN).
OPTIONS
-c C Start from ASCII character C
-l LEN
Stop when LEN characters have been generated.
-p Produce only printable characters
-s N Start from character with ordinal number N
*/
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
int
main(int argc, char **argv)
{
int c;
int start = 0;
int mod = UCHAR_MAX;
size_t i, len = 4096;
int printable = 0;
char *p;
while ((c = getopt(argc, argv, "cl:ps:")) != EOF) {
switch (c) {
case 'c':
start = optarg[0];
break;
case 'p':
printable = 1;
break;
case 's':
start = atoi(optarg) % UCHAR_MAX;
break;
case 'l':
errno = 0;
len = strtoul(optarg, &p, 10);
if (*p) {
fprintf(stderr, "bad length (near %s)", p);
exit(1);
} else if (errno) {
perror("bad length");
exit(1);
}
break;
default:
exit(2);
}
}
if (printable && !isprint(start))
do {
start = (start + 1) % mod;
} while (printable && !isprint(start));
for (i = 0; i < len; i++) {
putchar(start);
do {
start = (start + 1) % mod;
} while (printable && !isprint(start));
}
return 0;
}
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