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Annotation of src/usr.bin/dc/dc.c, Revision 1.2

1.2     ! deraadt     1: /*     $OpenBSD: dc.c,v 1.1 2003/09/19 17:58:25 otto Exp $     */
1.1       otto        2:
                      3: /*
                      4:  * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net>
                      5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
                      7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
                      9:  *
                     10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     17:  */
                     18:
                     19: #ifndef lint
1.2     ! deraadt    20: static const char rcsid[] = "$OpenBSD: dc.c,v 1.1 2003/09/19 17:58:25 otto Exp $";
1.1       otto       21: #endif /* not lint */
                     22:
                     23: #include <err.h>
                     24: #include <stdlib.h>
                     25: #include <string.h>
                     26:
                     27: #include "extern.h"
                     28:
                     29: static __dead void     usage(void);
                     30:
1.2     ! deraadt    31: extern char            *__progname;
1.1       otto       32:
                     33: static __dead void
                     34: usage(void)
                     35: {
                     36:        fprintf(stderr, "usage: %s [file]\n", __progname);
                     37:        exit(1);
                     38: }
                     39:
                     40: int
                     41: main(int argc, char *argv[])
                     42: {
                     43:        FILE            *file;
                     44:        struct source   src;
                     45:
                     46:        if (argc > 2)
                     47:                usage();
                     48:
                     49:
                     50:        init_bmachine();
                     51:        setlinebuf(stdout);
                     52:        setlinebuf(stderr);
                     53:        if (argc == 2 && strcmp(argv[1], "-") != 0) {
                     54:                file = fopen(argv[1], "r");
                     55:                if (file == NULL)
                     56:                        err(1, "cannot open file %s", argv[1]);
                     57:                src_setstream(&src, file);
                     58:                reset_bmachine(&src);
                     59:                eval();
                     60:                fclose(file);
                     61:        }
                     62:        /*
                     63:         * BSD dc and Solaris dc continue with stdin after processing
                     64:         * the file given as the argument.
                     65:         */
                     66:        src_setstream(&src, stdin);
                     67:        reset_bmachine(&src);
                     68:        eval();
                     69:
                     70:        return 0;
                     71: }