FreeBSD/Linux Kernel Cross Reference
sys/boot/common/misc.c

     /*-
      * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
      * 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>
    __FBSDID("$FreeBSD: releng/8.2/sys/boot/common/misc.c 181278 2008-08-04 06:39:52Z cperciva $");
    
    #include <string.h>
    #include <stand.h>
    #include <bootstrap.h>
    
    /*
     * Concatenate the (argc) elements of (argv) into a single string, and return
     * a copy of same.
     */
    char *
    unargv(int argc, char *argv[])
    {
        size_t      hlong;
        int         i;
        char        *cp;
    
        for (i = 0, hlong = 0; i < argc; i++)
            hlong += strlen(argv[i]) + 2;
    
        if(hlong == 0)
            return(NULL);
    
        cp = malloc(hlong);
        cp[0] = 0;
        for (i = 0; i < argc; i++) {
            strcat(cp, argv[i]);
            if (i < (argc - 1))
              strcat(cp, " ");
        }
              
        return(cp);
    }
    
    /*
     * Get the length of a string in kernel space
     */
    size_t
    strlenout(vm_offset_t src)
    {
        char        c;
        size_t      len;
        
        for (len = 0; ; len++) {
            archsw.arch_copyout(src++, &c, 1);
            if (c == 0)
                break;
        }
        return(len);
    }
    
    /*
     * Make a duplicate copy of a string in kernel space
     */
    char *
    strdupout(vm_offset_t str)
    {
        char        *result, *cp;
        
        result = malloc(strlenout(str) + 1);
        for (cp = result; ;cp++) {
            archsw.arch_copyout(str++, cp, 1);
            if (*cp == 0)
                break;
        }
        return(result);
    }
    
    /* Zero a region in kernel space. */
    void
    kern_bzero(vm_offset_t dest, size_t len)
    {
           char buf[256];
           size_t chunk, resid;
   
           bzero(buf, sizeof(buf));
           resid = len;
           while (resid > 0) {
                   chunk = min(sizeof(buf), resid);
                   archsw.arch_copyin(buf, dest, chunk);
                   resid -= chunk;
                   dest += chunk;
           }
   }
   
   /*
    * Read the specified part of a file to kernel space.  Unlike regular
    * pread, the file pointer is advanced to the end of the read data,
    * and it just returns 0 if successful.
    */
   int
   kern_pread(int fd, vm_offset_t dest, size_t len, off_t off)
   {
           ssize_t nread;
   
           if (lseek(fd, off, SEEK_SET) == -1) {
                   printf("\nlseek failed\n");
                   return (-1);
           }
           nread = archsw.arch_readin(fd, dest, len);
           if (nread != len) {
                   printf("\nreadin failed\n");
                   return (-1);
           }
           return (0);
   }
   
   /*
    * Read the specified part of a file to a malloced buffer.  The file
    * pointer is advanced to the end of the read data.
    */
   void *
   alloc_pread(int fd, off_t off, size_t len)
   {
           void *buf;
           ssize_t nread;
   
           buf = malloc(len);
           if (buf == NULL) {
                   printf("\nmalloc(%d) failed\n", (int)len);
                   return (NULL);
           }
           if (lseek(fd, off, SEEK_SET) == -1) {
                   printf("\nlseek failed\n");
                   free(buf);
                   return (NULL);
           }
           nread = read(fd, buf, len);
           if (nread != len) {
                   printf("\nread failed\n");
                   free(buf);
                   return (NULL);
           }
           return (buf);
   }
   
   /*
    * Display a region in traditional hexdump format.
    */
   void
   hexdump(caddr_t region, size_t len)
   {
       caddr_t     line;
       int         x, c;
       char        lbuf[80];
   #define emit(fmt, args...)      {sprintf(lbuf, fmt , ## args); pager_output(lbuf);}
   
       pager_open();
       for (line = region; line < (region + len); line += 16) {
           emit("%08lx  ", (long) line);
           
           for (x = 0; x < 16; x++) {
               if ((line + x) < (region + len)) {
                   emit("%02x ", *(u_int8_t *)(line + x));
               } else {
                   emit("-- ");
               }
               if (x == 7)
                   emit(" ");
           }
           emit(" |");
           for (x = 0; x < 16; x++) {
               if ((line + x) < (region + len)) {
                   c = *(u_int8_t *)(line + x);
                   if ((c < ' ') || (c > '~'))     /* !isprint(c) */
                       c = '.';
                   emit("%c", c);
               } else {
                   emit(" ");
               }
           }
           emit("|\n");
       }
       pager_close();
   }
   
   void
   dev_cleanup(void)
   {
       int         i;
   
       /* Call cleanup routines */
       for (i = 0; devsw[i] != NULL; ++i)
           if (devsw[i]->dv_cleanup != NULL)
               (devsw[i]->dv_cleanup)();
   }

Cache object: e77e62ad21a54a0293d7ed043ad0eab7