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/* $OpenBSD: dc.c,v 1.12 2014/05/20 01:25:23 guenther 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.
*/
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
static __dead void usage(void);
extern char *__progname;
static __dead void
usage(void)
{
(void)fprintf(stderr, "usage: %s [-x] [-e expression] [file]\n",
__progname);
exit(1);
}
int
main(int argc, char *argv[])
{
int ch;
bool extended_regs = false;
FILE *file;
struct source src;
char *buf, *p;
struct stat st;
if ((buf = strdup("")) == NULL)
err(1, NULL);
/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
while ((ch = getopt(argc, argv, "e:x-")) != -1) {
switch (ch) {
case 'e':
p = buf;
if (asprintf(&buf, "%s %s", buf, optarg) == -1)
err(1, NULL);
free(p);
break;
case 'x':
extended_regs = true;
break;
case '-':
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
init_bmachine(extended_regs);
(void)setlinebuf(stdout);
(void)setlinebuf(stderr);
if (argc > 1)
usage();
if (buf[0] != '\0') {
src_setstring(&src, buf);
reset_bmachine(&src);
eval();
free(buf);
if (argc == 0)
return (0);
}
if (argc == 1) {
file = fopen(argv[0], "r");
if (file == NULL)
err(1, "cannot open file %s", argv[0]);
if (fstat(fileno(file), &st) == -1)
err(1, "%s", argv[0]);
if (S_ISDIR(st.st_mode))
errc(1, EISDIR, "%s", argv[0]);
src_setstream(&src, file);
reset_bmachine(&src);
eval();
(void)fclose(file);
/*
* BSD and Solaris dc(1) continue with stdin after processing
* the file given as the argument. We follow GNU dc(1).
*/
return (0);
}
src_setstream(&src, stdin);
reset_bmachine(&src);
eval();
return (0);
}
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