1 files changed, 122 insertions, 0 deletions
diff --git a/lib/libc/gen/getobjformat.c b/lib/libc/gen/getobjformat.c
new file mode 100644
index 000000000000..c21edfc07c42
--- /dev/null
+++ b/lib/libc/gen/getobjformat.c
@@ -0,0 +1,122 @@
+/*-
+ * Copyright (c) 1998 John D. Polstra
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#ifdef __FBSDID
+__FBSDID("$FreeBSD$");
+#endif
+
+#include <sys/param.h>
+#include <objformat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define PATH_OBJFORMAT	"/etc/objformat"
+
+static int copyformat(char *, const char *, size_t);
+
+static const char *known_formats[] = { OBJFORMAT_NAMES, NULL };
+
+static int
+copyformat(char *buf, const char *fmt, size_t bufsize)
+{
+	size_t		 len;
+
+	len = strlen(fmt);
+	if (len > bufsize - 1)
+		return -1;
+	strcpy(buf, fmt);
+	return len;
+}
+
+int
+getobjformat(char *buf, size_t bufsize, int *argcp, char **argv)
+{
+	const char	 *fmt;
+	char		**src, **dst;
+	const char	 *env;
+	FILE		 *fp;
+
+	fmt = NULL;
+
+	if (argv != NULL) {
+		/* 
+		 * Scan for arguments setting known formats, e.g., "-elf".
+		 * If "argcp" is non-NULL, delete these arguments from the
+		 * list and update the argument count in "*argcp".
+		 */
+		for (dst = src = argv;  *src != NULL;  src++) {
+			if ((*src)[0] == '-') {
+				const char **p;
+
+				for (p = known_formats;  *p != NULL;  p++)
+					if (strcmp(*src + 1, *p) == 0)
+						break;
+				if (*p != NULL) {
+					fmt = *p;
+					if (argcp == NULL)  /* Don't delete */
+						*dst++ = *src;
+				} else
+					*dst++ = *src;
+			} else
+				*dst++ = *src;
+		}
+		*dst = NULL;
+		if (argcp != NULL)
+			*argcp -= src - dst;
+		if (fmt != NULL)
+			return copyformat(buf, fmt, bufsize);
+	}
+
+	/* Check the OBJFORMAT environment variable. */
+	if ((env = getenv("OBJFORMAT")) != NULL)
+		return copyformat(buf, env, bufsize);
+
+	/* Take a look at "/etc/objformat". */
+	if ((fp = fopen(PATH_OBJFORMAT, "r")) != NULL) {
+		char line[1024];
+		int found;
+		int len;
+
+		found = len = 0;
+		while (fgets(line, sizeof line, fp) != NULL) {
+			if (strncmp(line, "OBJFORMAT=", 10) == 0) {
+				char *p = &line[10];
+
+				p[strcspn(p, " \t\n")] = '\0';
+				len = copyformat(buf, p, bufsize);
+				found = 1;
+			}
+		}
+		fclose(fp);
+		if (found)
+			return len;
+	}
+
+	/* As a last resort, use the compiled in default. */
+	return copyformat(buf, OBJFORMAT_DEFAULT, bufsize);
+}