122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/* $OpenBSD: dc.c,v 1.21 2024/04/23 13:34:50 jsg Exp $ */
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/*
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* Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "extern.h"
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static __dead void usage(void);
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extern char *__progname;
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static __dead void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-x] [-e expression] [file]\n",
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__progname);
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exit(1);
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}
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int
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dc_main(int argc, char *argv[])
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{
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int ch;
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bool extended_regs = false;
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FILE *file;
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struct source src;
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char *buf, *p;
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struct stat st;
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buf = bstrdup("");
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/* accept and ignore a single dash to be 4.4BSD dc(1) compatible */
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optind = 1;
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optreset = 1;
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while ((ch = getopt(argc, argv, "e:x-")) != -1) {
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switch (ch) {
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case 'e':
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p = buf;
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if (asprintf(&buf, "%s %s", buf, optarg) == -1)
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err(1, NULL);
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free(p);
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break;
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case 'x':
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extended_regs = true;
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break;
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case '-':
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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}
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init_bmachine(extended_regs);
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(void)setvbuf(stdout, NULL, _IOLBF, 0);
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(void)setvbuf(stderr, NULL, _IOLBF, 0);
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if (argc > 1)
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usage();
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if (buf[0] != '\0') {
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src_setstring(&src, buf);
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reset_bmachine(&src);
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eval();
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free(buf);
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if (argc == 0)
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return (0);
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}
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if (argc == 1) {
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file = fopen(argv[0], "r");
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if (file == NULL)
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err(1, "cannot open file %s", argv[0]);
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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if (fstat(fileno(file), &st) == -1)
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err(1, "%s", argv[0]);
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if (S_ISDIR(st.st_mode))
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errc(1, EISDIR, "%s", argv[0]);
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src_setstream(&src, file);
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reset_bmachine(&src);
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eval();
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(void)fclose(file);
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/*
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* BSD and Solaris dc(1) continue with stdin after processing
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* the file given as the argument. We follow GNU dc(1).
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*/
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return (0);
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}
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src_setstream(&src, stdin);
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reset_bmachine(&src);
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eval();
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return (0);
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}
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