load.c

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    1 /*-
    2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD$");
   29 
   30 #include <stand.h>
   31 
   32 #define LOAD_TINYBUF    2048
   33 
   34 /*
   35  * Attempt to load the file at (path) into an allocated
   36  * area on the heap, return a pointer to it or NULL
   37  * on failure.
   38  *
   39  * Because in many cases it is impossible to determine the
   40  * true size of a file without reading it, we do just that.
   41  */
   42 char *
   43 filedup(const char *path, int flags)
   44 {
   45     char        *buf;
   46     int         fd;
   47     size_t      size, result;
   48 
   49     if ((fd = open(path, F_READ | flags)) == -1)
   50         return(NULL);
   51 
   52     printf("%s open, flags 0x%x\n", path, files[fd].f_flags);
   53     buf = alloc(LOAD_TINYBUF);
   54 
   55     /* Read the first buffer-full */
   56     size = read(fd, buf, LOAD_TINYBUF);
   57     if (size < 1) {
   58         free(buf, LOAD_TINYBUF);
   59         close(fd);
   60         return(NULL);
   61     }
   62     /* If it all fitted, then just return the buffer straight out */
   63     if (size < LOAD_TINYBUF) {
   64         close(fd);
   65         buf[size] = 0;
   66         return(buf);
   67     }
   68 
   69     printf("tinybuf loaded, size %d\n", size);
   70     getchar();
   71 
   72     /* Read everything until we know how big it is */
   73     for (;;) {
   74         result = read(fd, buf, LOAD_TINYBUF);
   75         if (result == -1) {
   76             free(buf, LOAD_TINYBUF);
   77             close(fd);
   78             return(NULL);
   79         }
   80         if (result == 0)
   81             break;
   82         size += result;
   83     }
   84 
   85     /* discard the old buffer, close the file */
   86     free(buf, LOAD_TINYBUF);
   87     close(fd);
   88 
   89     /* reopen the file, realloc the buffer */
   90     if ((fd = open(path, F_READ | flags)) == -1)
   91         return(NULL);
   92     buf = alloc(size);
   93     result = read(fd, buf, size);
   94     close(fd);
   95     if (result != size) {
   96         free(buf, size);
   97         return(NULL);
   98     }
   99     return(buf);
  100 }
  101

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

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