getsecbyname.c   [plain text]

/*
 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
 * Reserved.  This file contains Original Code and/or Modifications of
 * Original Code as defined in and that are subject to the Apple Public
 * Source License Version 1.1 (the "License").  You may not use this file
 * except in compliance with the License.  Please obtain a copy of the
 * License at http://www.apple.com/publicsource and read it before using
 * this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
#include <string.h>
#import "mach-o/loader.h"

/*
 * This routine returns the section structure for the named section in the
 * named segment for the mach_header pointer passed to it if it exist.
 * Otherwise it returns zero.
 */
const struct section *
getsectbynamefromheader(
const struct mach_header *mhp,
const char *segname,
const char *sectname)
{
    struct segment_command *sgp;
    struct section *sp;
    long i, j;
        
	sgp = (struct segment_command *)
	      ((char *)mhp + sizeof(struct mach_header));
	for(i = 0; i < mhp->ncmds; i++){
	    if(sgp->cmd == LC_SEGMENT)
		if(strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0){
		    sp = (struct section *)((char *)sgp +
			 sizeof(struct segment_command));
		    for(j = 0; j < sgp->nsects; j++){
			if(strncmp(sp->sectname, sectname,
			   sizeof(sp->sectname)) == 0 &&
			   strncmp(sp->segname, segname,
			   sizeof(sp->segname)) == 0)
			    return(sp);
			sp = (struct section *)((char *)sp +
			     sizeof(struct section));
		    }
		}
	    sgp = (struct segment_command *)((char *)sgp + sgp->cmdsize);
	}
	return((const struct section *)0);
}