src/mac/xpm/RdFToBuf.c

   1 /*
   2  * Copyright (C) 1989-95 GROUPE BULL
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to
   6  * deal in the Software without restriction, including without limitation the
   7  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   8  * sell copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  17  * GROUPE BULL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * Except as contained in this notice, the name of GROUPE BULL shall not be
  22  * used in advertising or otherwise to promote the sale, use or other dealings
  23  * in this Software without prior written authorization from GROUPE BULL.
  24  */
  25
  26 /*****************************************************************************\
  27 * RdFToBuf.c:                                                                 *
  28 *                                                                             *
  29 *  XPM library                                                                *
  30 *  Copy a file to a malloc'ed buffer, provided as a convenience.              *
  31 *                                                                             *
  32 *  Developed by Arnaud Le Hors                                                *
  33 \*****************************************************************************/
  34
  35 /*
  36  * The code related to FOR_MSW has been added by
  37  * HeDu (hedu@cul-ipn.uni-kiel.de) 4/94
  38  */
  39
  40 #include "wx/setup.h"
  41
  42 #ifdef macintosh
  43         #ifdef __std
  44                 #undef __std
  45                 #define __std()
  46         #endif
  47         #include <stat.h>
  48         #include <unix.h>
  49     #include <unistd.h>
  50         #include <fcntl.h>
  51 #endif
  52
  53 #include "XpmI.h"
  54 #ifndef macintosh
  55         #include <sys/stat.h>
  56
  57         #if !defined(FOR_MSW) && !defined(WIN32)
  58         #include <unistd.h>
  59         #endif
  60         #ifndef VAX11C
  61         #include <fcntl.h>
  62         #endif
  63         #if defined(FOR_MSW) || defined(WIN32)
  64         #include <io.h>
  65         #define stat _stat
  66         #define fstat _fstat
  67         #define fdopen _fdopen
  68         #define O_RDONLY _O_RDONLY
  69         #endif
  70 #endif
  71
  72 int
  73 XpmReadFileToBuffer(filename, buffer_return)
  74     char *filename;
  75     char **buffer_return;
  76 {
  77     int fd, fcheck, len;
  78     char *ptr;
  79     struct stat stats;
  80     FILE *fp;
  81
  82     *buffer_return = NULL;
  83
  84 #ifndef VAX11C
  85     fd = open(filename, O_RDONLY);
  86 #else
  87     fd = open(filename, O_RDONLY, NULL);
  88 #endif
  89     if (fd < 0)
  90         return XpmOpenFailed;
  91
  92     if (fstat(fd, &stats)) {
  93         close(fd);
  94         return XpmOpenFailed;
  95     }
  96     fp = fdopen(fd, "r");
  97     if (!fp) {
  98         close(fd);
  99         return XpmOpenFailed;
 100     }
 101     len = (int) stats.st_size;
 102     ptr = (char *) XpmMalloc(len + 1);
 103     if (!ptr) {
 104         fclose(fp);
 105         return XpmNoMemory;
 106     }
 107     fcheck = fread(ptr, 1, len, fp);
 108     fclose(fp);
 109 #ifdef VMS
 110     /* VMS often stores text files in a variable-length record format,
 111        where there are two bytes of size followed by the record.  fread
 112        converts this so it looks like a record followed by a newline.
 113        Unfortunately, the size reported by fstat() (and fseek/ftell)
 114        counts the two bytes for the record terminator, while fread()
 115        counts only one.  So, fread() sees fewer bytes in the file (size
 116        minus # of records) and thus when asked to read the amount
 117        returned by stat(), it fails.
 118        The best solution, suggested by DEC, seems to consider the length
 119        returned from fstat() as an upper bound and call fread() with
 120        a record length of 1. Then don't check the return value.
 121        We'll check for 0 for gross error that's all.
 122     */
 123     len = fcheck;
 124     if (fcheck == 0) {
 125 #else
 126     if (fcheck != len) {
 127 #endif
 128         XpmFree(ptr);
 129         return XpmOpenFailed;
 130     }
 131     ptr[len] = '\0';
 132     *buffer_return = ptr;
 133     return XpmSuccess;
 134 }