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 #ifdef macintosh
  41         #ifdef __std
  42                 #undef __std
  43                 #define __std()
  44         #endif
  45         #include <unistd.h>
  46         #include <stat.h>
  47         #include <fcntl.h>
  48         #include <unix.h>
  49 #endif
  50
  51 #include "xpmi.h"
  52 #ifndef macintosh
  53         #include <sys/stat.h>
  54
  55         #if !defined(FOR_MSW) && !defined(WIN32)
  56         #include <unistd.h>
  57         #endif
  58         #ifndef VAX11C
  59         #include <fcntl.h>
  60         #endif
  61         #if defined(FOR_MSW) || defined(WIN32)
  62         #include <io.h>
  63         #define stat _stat
  64         #define fstat _fstat
  65         #define fdopen _fdopen
  66         #define O_RDONLY _O_RDONLY
  67         #endif
  68 #endif
  69
  70 int
  71 XpmReadFileToBuffer(filename, buffer_return)
  72     char *filename;
  73     char **buffer_return;
  74 {
  75     int fd, fcheck, len;
  76     char *ptr;
  77     struct stat stats;
  78     FILE *fp;
  79
  80     *buffer_return = NULL;
  81
  82 #ifndef VAX11C
  83     fd = open(filename, O_RDONLY);
  84 #else
  85     fd = open(filename, O_RDONLY, NULL);
  86 #endif
  87     if (fd < 0)
  88         return XpmOpenFailed;
  89
  90     if (fstat(fd, &stats)) {
  91         close(fd);
  92         return XpmOpenFailed;
  93     }
  94     fp = fdopen(fd, "r");
  95     if (!fp) {
  96         close(fd);
  97         return XpmOpenFailed;
  98     }
  99     len = (int) stats.st_size;
 100     ptr = (char *) XpmMalloc(len + 1);
 101     if (!ptr) {
 102         fclose(fp);
 103         return XpmNoMemory;
 104     }
 105     fcheck = fread(ptr, 1, len, fp);
 106     fclose(fp);
 107 #ifdef VMS
 108     /* VMS often stores text files in a variable-length record format,
 109        where there are two bytes of size followed by the record.  fread
 110        converts this so it looks like a record followed by a newline.
 111        Unfortunately, the size reported by fstat() (and fseek/ftell)
 112        counts the two bytes for the record terminator, while fread()
 113        counts only one.  So, fread() sees fewer bytes in the file (size
 114        minus # of records) and thus when asked to read the amount
 115        returned by stat(), it fails.
 116        The best solution, suggested by DEC, seems to consider the length
 117        returned from fstat() as an upper bound and call fread() with
 118        a record length of 1. Then don't check the return value.
 119        We'll check for 0 for gross error that's all.
 120     */
 121     len = fcheck;
 122     if (fcheck == 0) {
 123 #else
 124     if (fcheck != len) {
 125 #endif
 126         XpmFree(ptr);
 127         return XpmOpenFailed;
 128     }
 129     ptr[len] = '\0';
 130     *buffer_return = ptr;
 131     return XpmSuccess;
 132 }