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m68k/libelf/lib/input.c

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+/*
+ * input.c - low-level input for libelf.
+ * Copyright (C) 1995 - 2001, 2005 Michael Riepe
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <private.h>
+
+#ifndef lint
+static const char rcsid[] = "@(#) $Id: input.c,v 1.1 2008/06/16 00:01:22 cjohns Exp $";
+#endif /* lint */
+
+#include <errno.h>
+
+#if HAVE_MMAP
+#include <sys/mman.h>
+#endif /* HAVE_MMAP */
+
+static int
+xread(int fd, char *buffer, size_t len) {
+    size_t done = 0;
+    size_t n;
+
+    while (done < len) {
+	n = read(fd, buffer + done, len - done);
+	if (n == 0) {
+	    /* premature end of file */
+	    return -1;
+	}
+	else if (n != (size_t)-1) {
+	    /* some bytes read, continue */
+	    done += n;
+	}
+	else if (errno != EAGAIN && errno != EINTR) {
+	    /* real error */
+	    return -1;
+	}
+    }
+    return 0;
+}
+
+void*
+_elf_read(Elf *elf, void *buffer, size_t off, size_t len) {
+    void *tmp;
+
+    elf_assert(elf);
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    elf_assert(off >= 0 && off + len <= elf->e_size);
+    if (elf->e_disabled) {
+	seterr(ERROR_FDDISABLED);
+    }
+    else if (len) {
+	off += elf->e_base;
+	if (lseek(elf->e_fd, (off_t)off, SEEK_SET) != (off_t)off) {
+	    seterr(ERROR_IO_SEEK);
+	}
+	else if (!(tmp = buffer) && !(tmp = malloc(len))) {
+	    seterr(ERROR_IO_2BIG);
+	}
+	else if (xread(elf->e_fd, tmp, len)) {
+	    seterr(ERROR_IO_READ);
+	    if (tmp != buffer) {
+		free(tmp);
+	    }
+	}
+	else {
+	    return tmp;
+	}
+    }
+    return NULL;
+}
+
+void*
+_elf_mmap(Elf *elf) {
+#if HAVE_MMAP
+    void *tmp;
+
+    elf_assert(elf);
+    elf_assert(elf->e_magic == ELF_MAGIC);
+    elf_assert(elf->e_base == 0);
+    if (elf->e_disabled) {
+	seterr(ERROR_FDDISABLED);
+    }
+    else if (elf->e_size) {
+	tmp = (void*)mmap(0, elf->e_size, PROT_READ | PROT_WRITE,
+			  MAP_PRIVATE, elf->e_fd, 0);
+	if (tmp != (void*)-1) {
+	    return tmp;
+	}
+    }
+#endif /* HAVE_MMAP */
+    return NULL;
+}