128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* Copyright (C) 1989-95 GROUPE BULL
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* GROUPE BULL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of GROUPE BULL shall not be
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* used in advertising or otherwise to promote the sale, use or other dealings
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* in this Software without prior written authorization from GROUPE BULL.
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*/
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/*****************************************************************************\
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* RdFToBuf.c: *
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* *
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* XPM library *
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* Copy a file to a malloc'ed buffer, provided as a convenience. *
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* *
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* Developed by Arnaud Le Hors *
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\*****************************************************************************/
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/*
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* The code related to FOR_MSW has been added by
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* HeDu (hedu@cul-ipn.uni-kiel.de) 4/94
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*/
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/* October 2004, source code review by Thomas Biege <thomas@suse.de> */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "XpmI.h"
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#include <sys/stat.h>
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#if !defined(FOR_MSW) && !defined(WIN32)
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#include <unistd.h>
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#endif
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#ifndef VAX11C
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#include <fcntl.h>
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#endif
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#if defined(FOR_MSW) || defined(WIN32)
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#include <io.h>
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#define stat _stat
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#define fstat _fstat
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#define fdopen _fdopen
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#define O_RDONLY _O_RDONLY
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#endif
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int
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XpmReadFileToBuffer(
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const char *filename,
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char **buffer_return)
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{
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int fd, fcheck;
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off_t len;
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char *ptr;
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struct stat stats;
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FILE *fp;
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*buffer_return = NULL;
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#ifndef VAX11C
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fd = open(filename, O_RDONLY | O_CLOEXEC);
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#else
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fd = open(filename, O_RDONLY, NULL);
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#endif
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if (fd < 0)
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return XpmOpenFailed;
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if (fstat(fd, &stats)) {
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close(fd);
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return XpmOpenFailed;
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}
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fp = fdopen(fd, "r");
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if (!fp) {
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close(fd);
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return XpmOpenFailed;
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}
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len = stats.st_size;
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if (len < 0 || len >= SIZE_MAX) {
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fclose(fp);
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return XpmOpenFailed;
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}
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ptr = (char *) XpmMalloc(len + 1);
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if (!ptr) {
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fclose(fp);
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return XpmNoMemory;
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}
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fcheck = fread(ptr, 1, len, fp);
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fclose(fp);
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#ifdef VMS
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/* VMS often stores text files in a variable-length record format,
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where there are two bytes of size followed by the record. fread
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converts this so it looks like a record followed by a newline.
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Unfortunately, the size reported by fstat() (and fseek/ftell)
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counts the two bytes for the record terminator, while fread()
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counts only one. So, fread() sees fewer bytes in the file (size
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minus # of records) and thus when asked to read the amount
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returned by stat(), it fails.
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The best solution, suggested by DEC, seems to consider the length
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returned from fstat() as an upper bound and call fread() with
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a record length of 1. Then don't check the return value.
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We'll check for 0 for gross error that's all.
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*/
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len = fcheck;
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if (fcheck == 0) {
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#else
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if (fcheck != len) {
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#endif
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XpmFree(ptr);
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return XpmOpenFailed;
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}
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ptr[len] = '\0';
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*buffer_return = ptr;
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return XpmSuccess;
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}
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