/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2002 Tim J. Robbins.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * c99 -- compile standard C programs
 *
 * This is essentially a wrapper around the system C compiler that forces
 * the compiler into C99 mode and handles some of the standard libraries
 * specially.
 */

#include <sys/types.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static char **args;
static u_int cargs, nargs;

static void addarg(const char *);
static void addlib(const char *);
static void usage(void) __dead2;

int
main(int argc, char *argv[])
{
        int ch, i;

        args = NULL;
        cargs = nargs = 0;

        while ((ch = getopt(argc, argv, "cD:EgI:L:o:O:sU:l:")) != -1) {
                if (ch == 'l') {
                        /* Gone too far. Back up and get out. */
                        if (argv[optind - 1][0] == '-')
                                optind -= 1;
                        else
                                optind -= 2;
                        break;
                } else if (ch == '?')
                        usage();
        }

        addarg("/usr/bin/cc");
        addarg("-std=iso9899:1999");
        addarg("-pedantic");
        for (i = 1; i < optind; i++)
                addarg(argv[i]);
        while (i < argc) {
                if (strncmp(argv[i], "-l", 2) == 0) {
                        if (argv[i][2] != '\0')
                                addlib(argv[i++] + 2);
                        else {
                                if (argv[++i] == NULL)
                                        usage();
                                addlib(argv[i++]);
                        }
                } else
                        addarg(argv[i++]);
        }
        execv("/usr/bin/cc", args);
        err(1, "/usr/bin/cc");
}

static void
addarg(const char *item)
{
        if (nargs + 1 >= cargs) {
                cargs += 16;
                if ((args = realloc(args, sizeof(*args) * cargs)) == NULL)
                        err(1, "malloc");
        }
        if ((args[nargs++] = strdup(item)) == NULL)
                err(1, "strdup");
        args[nargs] = NULL;
}

static void
addlib(const char *lib)
{

        if (strcmp(lib, "pthread") == 0)
                /* FreeBSD's gcc uses -pthread instead of -lpthread. */
                addarg("-pthread");
        else if (strcmp(lib, "rt") == 0)
                /* librt functionality is in libc or unimplemented. */
                ;
        else if (strcmp(lib, "xnet") == 0)
                /* xnet functionality is in libc. */
                ;
        else {
                addarg("-l");
                addarg(lib);
        }
}

static void
usage(void)
{
        (void)fprintf(stderr, "%s\n%s\n",
"usage: c99 [-cEgs] [-D name[=value]] ... [-I directory] ... [-L directory] ...",
"       [-o outfile] [-O optlevel] [-U name] ... operand ...");
        exit(1);
}