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/* $OpenBSD: dc.c,v 1.4 2003/12/01 09:13:24 otto Exp $ */
/*
* Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: dc.c,v 1.4 2003/12/01 09:13:24 otto Exp $";
#endif /* not lint */
#include <err.h>
#include <unistd.h>
#include "extern.h"
static __dead void usage(void);
extern char *__progname;
static __dead void
usage(void)
{
fprintf(stderr, "usage: %s [-x] [file]\n", __progname);
exit(1);
}
int
main(int argc, char *argv[])
{
int ch;
bool extended_regs = false;
FILE *file;
struct source src;
/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
while ((ch = getopt(argc, argv, "x-")) != -1) {
switch (ch) {
case 'x':
extended_regs = true;
break;
case '-':
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
init_bmachine(extended_regs);
setlinebuf(stdout);
setlinebuf(stderr);
if (argc > 1)
usage();
else if (argc == 1) {
file = fopen(argv[0], "r");
if (file == NULL)
err(1, "cannot open file %s", argv[0]);
src_setstream(&src, file);
reset_bmachine(&src);
eval();
fclose(file);
}
/*
* BSD dc and Solaris dc continue with stdin after processing
* the file given as the argument.
*/
src_setstream(&src, stdin);
reset_bmachine(&src);
eval();
return 0;
}
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