contrib/bind-9.5.2/lib/isc/unix/stdio.c

   1 /*
   2  * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (C) 2000, 2001  Internet Software Consortium.
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  10  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  11  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  13  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  14  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  15  * PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /* $Id: stdio.c,v 1.8 2007/06/19 23:47:18 tbox Exp $ */
  19
  20 #include <config.h>
  21
  22 #include <errno.h>
  23 #include <unistd.h>
  24
  25 #include <isc/stdio.h>
  26
  27 #include "errno2result.h"
  28
  29 isc_result_t
  30 isc_stdio_open(const char *filename, const char *mode, FILE **fp) {
  31         FILE *f;
  32
  33         f = fopen(filename, mode);
  34         if (f == NULL)
  35                 return (isc__errno2result(errno));
  36         *fp = f;
  37         return (ISC_R_SUCCESS);
  38 }
  39
  40 isc_result_t
  41 isc_stdio_close(FILE *f) {
  42         int r;
  43
  44         r = fclose(f);
  45         if (r == 0)
  46                 return (ISC_R_SUCCESS);
  47         else
  48                 return (isc__errno2result(errno));
  49 }
  50
  51 isc_result_t
  52 isc_stdio_seek(FILE *f, long offset, int whence) {
  53         int r;
  54
  55         r = fseek(f, offset, whence);
  56         if (r == 0)
  57                 return (ISC_R_SUCCESS);
  58         else
  59                 return (isc__errno2result(errno));
  60 }
  61
  62 isc_result_t
  63 isc_stdio_read(void *ptr, size_t size, size_t nmemb, FILE *f, size_t *nret) {
  64         isc_result_t result = ISC_R_SUCCESS;
  65         size_t r;
  66
  67         clearerr(f);
  68         r = fread(ptr, size, nmemb, f);
  69         if (r != nmemb) {
  70                 if (feof(f))
  71                         result = ISC_R_EOF;
  72                 else
  73                         result = isc__errno2result(errno);
  74         }
  75         if (nret != NULL)
  76                 *nret = r;
  77         return (result);
  78 }
  79
  80 isc_result_t
  81 isc_stdio_write(const void *ptr, size_t size, size_t nmemb, FILE *f,
  82                size_t *nret)
  83 {
  84         isc_result_t result = ISC_R_SUCCESS;
  85         size_t r;
  86
  87         clearerr(f);
  88         r = fwrite(ptr, size, nmemb, f);
  89         if (r != nmemb)
  90                 result = isc__errno2result(errno);
  91         if (nret != NULL)
  92                 *nret = r;
  93         return (result);
  94 }
  95
  96 isc_result_t
  97 isc_stdio_flush(FILE *f) {
  98         int r;
  99
 100         r = fflush(f);
 101         if (r == 0)
 102                 return (ISC_R_SUCCESS);
 103         else
 104                 return (isc__errno2result(errno));
 105 }
 106
 107 isc_result_t
 108 isc_stdio_sync(FILE *f) {
 109         int r;
 110
 111         r = fsync(fileno(f));
 112         if (r == 0)
 113                 return (ISC_R_SUCCESS);
 114         else
 115                 return (isc__errno2result(errno));
 116 }
 117