external/bsd/ntp/dist/lib/isc/unix/stdio.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: stdio.c,v 1.8 2007/06/19 23:47:18 tbox Exp */
  21
  22 #include <config.h>
  23
  24 #include <errno.h>
  25 #include <unistd.h>
  26
  27 #include <isc/stdio.h>
  28
  29 #include "errno2result.h"
  30
  31 isc_result_t
  32 isc_stdio_open(const char *filename, const char *mode, FILE **fp) {
  33         FILE *f;
  34
  35         f = fopen(filename, mode);
  36         if (f == NULL)
  37                 return (isc__errno2result(errno));
  38         *fp = f;
  39         return (ISC_R_SUCCESS);
  40 }
  41
  42 isc_result_t
  43 isc_stdio_close(FILE *f) {
  44         int r;
  45
  46         r = fclose(f);
  47         if (r == 0)
  48                 return (ISC_R_SUCCESS);
  49         else
  50                 return (isc__errno2result(errno));
  51 }
  52
  53 isc_result_t
  54 isc_stdio_seek(FILE *f, long offset, int whence) {
  55         int r;
  56
  57         r = fseek(f, offset, whence);
  58         if (r == 0)
  59                 return (ISC_R_SUCCESS);
  60         else
  61                 return (isc__errno2result(errno));
  62 }
  63
  64 isc_result_t
  65 isc_stdio_read(void *ptr, size_t size, size_t nmemb, FILE *f, size_t *nret) {
  66         isc_result_t result = ISC_R_SUCCESS;
  67         size_t r;
  68
  69         clearerr(f);
  70         r = fread(ptr, size, nmemb, f);
  71         if (r != nmemb) {
  72                 if (feof(f))
  73                         result = ISC_R_EOF;
  74                 else
  75                         result = isc__errno2result(errno);
  76         }
  77         if (nret != NULL)
  78                 *nret = r;
  79         return (result);
  80 }
  81
  82 isc_result_t
  83 isc_stdio_write(const void *ptr, size_t size, size_t nmemb, FILE *f,
  84                size_t *nret)
  85 {
  86         isc_result_t result = ISC_R_SUCCESS;
  87         size_t r;
  88
  89         clearerr(f);
  90         r = fwrite(ptr, size, nmemb, f);
  91         if (r != nmemb)
  92                 result = isc__errno2result(errno);
  93         if (nret != NULL)
  94                 *nret = r;
  95         return (result);
  96 }
  97
  98 isc_result_t
  99 isc_stdio_flush(FILE *f) {
 100         int r;
 101
 102         r = fflush(f);
 103         if (r == 0)
 104                 return (ISC_R_SUCCESS);
 105         else
 106                 return (isc__errno2result(errno));
 107 }
 108
 109 isc_result_t
 110 isc_stdio_sync(FILE *f) {
 111         int r;
 112
 113         r = fsync(fileno(f));
 114         if (r == 0)
 115                 return (ISC_R_SUCCESS);
 116         else
 117                 return (isc__errno2result(errno));
 118 }
 119