/src/RdFToBuf.c
C | 124 lines | 66 code | 8 blank | 50 comment | 10 complexity | cf076b12eac6629f74e941d954995b54 MD5 | raw file
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/* October 2004, source code review by Thomas Biege <thomas@suse.de> */ 41 42#ifdef HAVE_CONFIG_H 43#include <config.h> 44#endif 45#include "XpmI.h" 46#include <sys/stat.h> 47#if !defined(FOR_MSW) && !defined(WIN32) 48#include <unistd.h> 49#endif 50#ifndef VAX11C 51#include <fcntl.h> 52#endif 53#if defined(FOR_MSW) || defined(WIN32) 54#include <io.h> 55#define stat _stat 56#define fstat _fstat 57#define fdopen _fdopen 58#define O_RDONLY _O_RDONLY 59#endif 60 61int 62XpmReadFileToBuffer( 63 char *filename, 64 char **buffer_return) 65{ 66 int fd, fcheck; 67 off_t len; 68 char *ptr; 69 struct stat stats; 70 FILE *fp; 71 72 *buffer_return = NULL; 73 74#ifndef VAX11C 75 fd = open(filename, O_RDONLY); 76#else 77 fd = open(filename, O_RDONLY, NULL); 78#endif 79 if (fd < 0) 80 return XpmOpenFailed; 81 82 if (fstat(fd, &stats)) { 83 close(fd); 84 return XpmOpenFailed; 85 } 86 fp = fdopen(fd, "r"); 87 if (!fp) { 88 close(fd); 89 return XpmOpenFailed; 90 } 91 len = stats.st_size; 92 ptr = (char *) XpmMalloc(len + 1); 93 if (!ptr) { 94 fclose(fp); 95 return XpmNoMemory; 96 } 97 fcheck = fread(ptr, 1, len, fp); 98 fclose(fp); 99#ifdef VMS 100 /* VMS often stores text files in a variable-length record format, 101 where there are two bytes of size followed by the record. fread 102 converts this so it looks like a record followed by a newline. 103 Unfortunately, the size reported by fstat() (and fseek/ftell) 104 counts the two bytes for the record terminator, while fread() 105 counts only one. So, fread() sees fewer bytes in the file (size 106 minus # of records) and thus when asked to read the amount 107 returned by stat(), it fails. 108 The best solution, suggested by DEC, seems to consider the length 109 returned from fstat() as an upper bound and call fread() with 110 a record length of 1. Then don't check the return value. 111 We'll check for 0 for gross error that's all. 112 */ 113 len = fcheck; 114 if (fcheck == 0) { 115#else 116 if (fcheck != len) { 117#endif 118 XpmFree(ptr); 119 return XpmOpenFailed; 120 } 121 ptr[len] = '\0'; 122 *buffer_return = ptr; 123 return XpmSuccess; 124}