gen/libsa/getsegbyname.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright 1993 NeXT, Inc.
  26  * All rights reserved.
  27  */
  28
  29 #import "libsa.h"
  30
  31 /*
  32  * This routine returns the segment_command structure for the named segment if
  33  * it exist in the mach executible it is linked into.  Otherwise it returns
  34  * zero.  It uses the specified mach_header pointer and just looks through the
  35  * load commands.
  36  */
  37 struct segment_command *
  38 getsegbynamefromheader(
  39 struct mach_header *mhp,
  40 char *segname)
  41 {
  42         struct segment_command *sgp;
  43         long i;
  44
  45         sgp = (struct segment_command *)
  46               ((char *)mhp + sizeof(struct mach_header));
  47         for(i = 0; i < mhp->ncmds; i++){
  48             if(sgp->cmd == LC_SEGMENT)
  49                 if(strncmp(sgp->segname, segname, sizeof(sgp->segname)) == 0)
  50                     return(sgp);
  51             sgp = (struct segment_command *)((char *)sgp + sgp->cmdsize);
  52         }
  53         return((struct segment_command *)0);
  54 }