diff options
Diffstat (limited to 'usr.bin/dc/dc.c')
-rw-r--r-- | usr.bin/dc/dc.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/usr.bin/dc/dc.c b/usr.bin/dc/dc.c new file mode 100644 index 0000000..1376653 --- /dev/null +++ b/usr.bin/dc/dc.c @@ -0,0 +1,135 @@ +/* $OpenBSD: dc.c,v 1.11 2009/10/27 23:59:37 deraadt Exp $ */ + +/* + * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net> + * Copyright (c) 2009, Gabor Kovesdan <gabor@FreeBSD.org> + * + * 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/stat.h> + +#include <ctype.h> +#include <err.h> +#include <errno.h> +#include <getopt.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "extern.h" + +#define DC_VER "1.3-FreeBSD" + +static void usage(void); + +extern char *__progname; + +struct source src; + +struct option long_options[] = +{ + {"expression", required_argument, NULL, 'e'}, + {"file", required_argument, NULL, 'f'}, + {"help", no_argument, NULL, 'h'}, + {"version", no_argument, NULL, 'V'} +}; + +static void +usage(void) +{ + fprintf(stderr, "usage: %s [-hVx] [-e expression] [file]\n", + __progname); + exit(1); +} + +static void +procfile(char *fname) { + struct stat st; + FILE *file; + + file = fopen(fname, "r"); + if (file == NULL) + err(1, "cannot open file %s", fname); + if (fstat(fileno(file), &st) == -1) + err(1, "%s", fname); + if (S_ISDIR(st.st_mode)) { + errno = EISDIR; + err(1, "%s", fname); + } + src_setstream(&src, file); + reset_bmachine(&src); + eval(); + fclose(file); +} + +int +main(int argc, char *argv[]) +{ + int ch; + bool extended_regs = false, preproc_done = false; + + /* accept and ignore a single dash to be 4.4BSD dc(1) compatible */ + while ((ch = getopt_long(argc, argv, "e:f:Vx", long_options, NULL)) != -1) { + switch (ch) { + case 'e': + src_setstring(&src, optarg); + reset_bmachine(&src); + eval(); + preproc_done = true; + break; + case 'f': + procfile(optarg); + preproc_done = true; + break; + case 'x': + extended_regs = true; + break; + case 'V': + fprintf(stderr, "%s (BSD bc) %s\n", __progname, DC_VER); + exit(0); + break; + case '-': + break; + case 'h': + /* FALLTHROUGH */ + default: + usage(); + } + } + argc -= optind; + argv += optind; + + init_bmachine(extended_regs); + setlinebuf(stdout); + setlinebuf(stderr); + + if (argc > 1) + usage(); + if (argc == 1) { + procfile(argv[0]); + preproc_done = true; + } + if (preproc_done) + return (0); + + src_setstream(&src, stdin); + reset_bmachine(&src); + eval(); + + return (0); +} |