1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * This is the Posix.2 mandated C compiler. Basically, a hook to the
5 * cc(1) command.
6 *
7 * Copyright (c) 2001 by Jens Schweikhardt
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 */
31
32 #include <sys/cdefs.h>
33 #include <err.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include <unistd.h>
39
40 #define CC "/usr/bin/cc" /* The big kahuna doing the actual work. */
41 #define N_ARGS_PREPENDED (sizeof(args_prepended) / sizeof(args_prepended[0]))
42
43 /*
44 * We do not add -D_POSIX_SOURCE here because any POSIX source is supposed to
45 * define it before inclusion of POSIX headers. This has the additional
46 * benefit of making c89 -D_ANSI_SOURCE do the right thing (or any other
47 * -D_FOO_SOURCE feature test macro we support.)
48 */
49 static const char *args_prepended[] = {
50 "-std=iso9899:199409",
51 "-pedantic"
52 };
53
54 static void usage(void);
55
56 /*
57 * Prepend the strings from args_prepended[] to the arg list; parse options,
58 * accepting only the POSIX c89 mandated options. Then exec cc to do the
59 * actual work.
60 */
61 int
main(int argc,char ** argv)62 main(int argc, char **argv)
63 {
64 int Argc, i;
65 size_t j;
66 union {
67 const char **a;
68 char * const *b;
69 } Argv;
70
71 Argc = 0;
72 Argv.a = malloc((argc + 1 + N_ARGS_PREPENDED) * sizeof *Argv.a);
73 if (Argv.a == NULL)
74 err(1, "malloc");
75 Argv.a[Argc++] = CC;
76 for (j = 0; j < N_ARGS_PREPENDED; ++j)
77 Argv.a[Argc++] = args_prepended[j];
78 while ((i = getopt(argc, argv, "cD:EgI:l:L:o:OsU:")) != -1) {
79 if (i == '?')
80 usage();
81 if (i == 'l') {
82 if (argv[optind - 1][0] == '-') /* -llib */
83 optind -= 1;
84 else /* -l lib */
85 optind -= 2;
86 break; /* -llib or -l lib starts the operands. */
87 }
88 }
89 if (argc == optind) {
90 warnx("missing operand");
91 usage();
92 }
93
94 /* Append argv[1..] at the end of Argv[].a. */
95 for (i = 1; i <= argc; ++i)
96 Argv.a[Argc++] = argv[i];
97 (void)execv(CC, Argv.b);
98 err(1, "execv(" CC ")");
99 }
100
101 static void
usage(void)102 usage(void)
103 {
104 fprintf(stderr,
105 "usage: c89 [-cEgOs] [-D name[=value]] ... [-I directory] ... [-L directory] ...\n"
106 " [-o outfile] [-U name] ... operand ...\n"
107 "\n"
108 " where operand is one or more of file.c, file.o, file.a\n"
109 " or -llibrary\n");
110 exit(1);
111 }
112