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         #include <stat.h>
  44         #include <unix.h>
  45     #include <unistd.h>
  46         #include <fcntl.h>
  47 #endif
  48
  49 #include "XpmI.h"
  50 #ifndef macintosh
  51         #include <sys/stat.h>
  52
  53         #if !defined(FOR_MSW) && !defined(WIN32)
  54         #include <unistd.h>
  55         #endif
  56         #ifndef VAX11C
  57         #include <fcntl.h>
  58         #endif
  59         #if defined(FOR_MSW) || defined(WIN32)
  60         #include <io.h>
  61         #define stat _stat
  62         #define fstat _fstat
  63         #define fdopen _fdopen
  64         #define O_RDONLY _O_RDONLY
  65         #endif
  66 #endif
  67
  68 int
  69 XpmReadFileToBuffer(filename, buffer_return)
  70     char *filename;
  71     char **buffer_return;
  72 {
  73     int fd, fcheck, len;
  74     char *ptr;
  75     struct stat stats;
  76     FILE *fp;
  77
  78     *buffer_return = NULL;
  79
  80 #ifndef VAX11C
  81     fd = open(filename, O_RDONLY);
  82 #else
  83     fd = open(filename, O_RDONLY, NULL);
  84 #endif
  85     if (fd < 0)
  86         return XpmOpenFailed;
  87
  88     if (fstat(fd, &stats)) {
  89         close(fd);
  90         return XpmOpenFailed;
  91     }
  92     fp = fdopen(fd, "r");
  93     if (!fp) {
  94         close(fd);
  95         return XpmOpenFailed;
  96     }
  97     len = (int) stats.st_size;
  98     ptr = (char *) XpmMalloc(len + 1);
  99     if (!ptr) {
 100         fclose(fp);
 101         return XpmNoMemory;
 102     }
 103     fcheck = fread(ptr, 1, len, fp);
 104     fclose(fp);
 105 #ifdef VMS
 106     /* VMS often stores text files in a variable-length record format,
 107        where there are two bytes of size followed by the record.  fread
 108        converts this so it looks like a record followed by a newline.
 109        Unfortunately, the size reported by fstat() (and fseek/ftell)
 110        counts the two bytes for the record terminator, while fread()
 111        counts only one.  So, fread() sees fewer bytes in the file (size
 112        minus # of records) and thus when asked to read the amount
 113        returned by stat(), it fails.
 114        The best solution, suggested by DEC, seems to consider the length
 115        returned from fstat() as an upper bound and call fread() with
 116        a record length of 1. Then don't check the return value.
 117        We'll check for 0 for gross error that's all.
 118     */
 119     len = fcheck;
 120     if (fcheck == 0) {
 121 #else
 122     if (fcheck != len) {
 123 #endif
 124         XpmFree(ptr);
 125         return XpmOpenFailed;
 126     }
 127     ptr[len] = '\0';
 128     *buffer_return = ptr;
 129     return XpmSuccess;
 130 }