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/*-
* Copyright (c) 1998, Peter Wemm <peter@netplex.com.au>
* 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#ifdef FREEBSD_ELF
int objformat_aout = 0;
#else
int objformat_aout = 1;
#endif
void
getobjfmt(void)
{
char *env;
int i;
/* first hint is /etc/objformat */
FILE *fp = fopen("/etc/objformat", "r");
if (fp) {
char buf[1024];
buf[1023] = '\0';
while (fgets(buf, sizeof(buf) - 1, fp) != NULL) {
i = strlen(buf);
if (buf[i - 1] == '\n')
buf[i - 1] = '\0';
if (strcmp(buf, "OBJFORMAT=aout") == 0)
objformat_aout = 1;
else if (strcmp(buf, "OBJFORMAT=elf") == 0)
objformat_aout = 0;
else
fprintf(stderr, "Unrecognized line in /etc/objformat: %s\n", buf);
}
fclose(fp);
}
/* but the user $OBJFORMAT overrides system default */
env = getenv("OBJFORMAT");
if (env) {
if (strcmp(env, "aout") == 0)
objformat_aout = 1;
else if (strcmp(env, "elf") == 0)
objformat_aout = 0;
else
fprintf(stderr, "Unrecognized value of $OBJFORMAT: %s\n", env);
}
}
void
scanargv(int *argc, char **argv, int strip)
{
int i, j;
for (i = 1; i < *argc; i++) {
if (strcmp (argv[i], "-aout") == 0) {
objformat_aout = 1;
continue;
} else if (strcmp (argv[i], "-elf") == 0) {
objformat_aout = 0;
continue;
}
}
/* if just looking, return now */
if (!strip)
return;
/* otherwise, remove all traces of switches from argv */
for (i = 1; i < *argc; i++) {
if (strcmp (argv[i], "-aout") == 0 ||
strcmp (argv[i], "-elf") == 0) {
/* copy NULL at end of argv as well */
for (j = i + 1; j <= *argc; j++) {
argv[j - 1] = argv[j];
}
(*argc)--;
}
}
}
#ifdef MAIN
int
main(int argc, char **argv)
{
char *path, *chunk;
char *postfix;
char *cmd, *newcmd = NULL;
char *objformat_path;
int i;
cmd = strrchr(argv[0], '/');
if (cmd)
cmd++;
else
cmd = argv[0];
getobjfmt();
scanargv(&argc, argv, 1);
if (strcmp(cmd, "objformat") == 0) {
if (objformat_aout)
printf("aout\n");
else
printf("elf\n");
exit(0);
}
/* 'make world' glue */
objformat_path = getenv("OBJFORMAT_PATH");
if (objformat_path == NULL)
objformat_path = "/usr/libexec";
path = strdup(objformat_path);
if (objformat_aout) {
putenv("OBJFORMAT=aout");
postfix = "aout";
} else {
putenv("OBJFORMAT=elf");
postfix = "elf";
}
while ((chunk = strsep(&path, ":")) != NULL) {
if (newcmd != NULL) {
free(newcmd);
newcmd = NULL;
}
asprintf(&newcmd, "%s/%s/%s", chunk, postfix, cmd);
if (newcmd == NULL)
err(1, "cannot allocate memory for new command");
if (getenv("OBJFORMAT_DEBUG") != NULL) {
fprintf(stderr, "objformat: %s -> %s\n", cmd, newcmd);
#if 0
for (i = 1; i < argc; i++)
fprintf(stderr, "argv[%d]: %s\n", i, argv[i]);
#endif
}
argv[0] = newcmd;
execv(newcmd, argv);
}
err(1, "could not exec %s/%s in %s", postfix, cmd, objformat_path);
}
#endif
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