libsecurity_ssl/sslViewer/fileIo.c

   1 /*
   2  * Copyright (c) 2001-2003,2006-2012 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * fileIo.c - simple file read/write utilities
  26  */
  27
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include "fileIo.h"
  36
  37 int writeFile(
  38         const char                      *fileName,
  39         const unsigned char     *bytes,
  40         unsigned                        numBytes)
  41 {
  42         int             rtn;
  43         int     fd;
  44
  45         fd = open(fileName, O_RDWR | O_CREAT | O_TRUNC, 0600);
  46         if(fd < 0) {
  47                 return errno;
  48         }
  49         rtn = lseek(fd, 0, SEEK_SET);
  50         if(rtn < 0) {
  51                 return errno;
  52         }
  53         rtn = write(fd, bytes, (size_t)numBytes);
  54         if(rtn != (int)numBytes) {
  55                 if(rtn >= 0) {
  56                         printf("writeFile: short write\n");
  57                 }
  58                 rtn = EIO;
  59         }
  60         else {
  61                 rtn = 0;
  62         }
  63         close(fd);
  64         return rtn;
  65 }
  66
  67 /*
  68  * Read entire file.
  69  */
  70 int readFile(
  71         const char              *fileName,
  72         unsigned char   **bytes,                // mallocd and returned
  73         unsigned                *numBytes)              // returned
  74 {
  75         int rtn;
  76         int fd;
  77         unsigned char *buf;
  78         struct stat     sb;
  79         unsigned size;
  80
  81         *numBytes = 0;
  82         *bytes = NULL;
  83         fd = open(fileName, O_RDONLY, 0);
  84         if(fd < 0) {
  85                 return errno;
  86         }
  87         rtn = fstat(fd, &sb);
  88         if(rtn) {
  89                 goto errOut;
  90         }
  91         size = sb.st_size;
  92         buf = malloc(size);
  93         if(buf == NULL) {
  94                 rtn = ENOMEM;
  95                 goto errOut;
  96         }
  97         rtn = lseek(fd, 0, SEEK_SET);
  98         if(rtn < 0) {
  99                 goto errOut;
 100         }
 101         rtn = read(fd, buf, (size_t)size);
 102         if(rtn != (int)size) {
 103                 if(rtn >= 0) {
 104                         printf("readFile: short read\n");
 105                 }
 106                 rtn = EIO;
 107         }
 108         else {
 109                 rtn = 0;
 110                 *bytes = buf;
 111                 *numBytes = size;
 112         }
 113 errOut:
 114         close(fd);
 115         return rtn;
 116 }