service_runtime/gio.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl Generic I/O interface.
  34  */
  35 #include "native_client/include/portability.h"
  36
  37 #include "native_client/service_runtime/gio.h"
  38
  39 struct GioVtbl const    kGioFileVtbl = {
  40   GioFileRead,
  41   GioFileWrite,
  42   GioFileSeek,
  43   GioFileFlush,
  44   GioFileClose,
  45   GioFileDtor,
  46 };
  47
  48 int GioFileCtor(struct GioFile  *self,
  49                 char const      *fname,
  50                 char const      *mode)
  51 {
  52   self->base.vtbl = (struct GioVtbl *) NULL;
  53   self->iop = fopen(fname, mode);
  54   if (NULL == self->iop) {
  55     return 0;
  56   }
  57   self->base.vtbl = &kGioFileVtbl;
  58   return 1;
  59 }
  60
  61 int GioFileRefCtor(struct GioFile   *self,
  62                    FILE             *iop)
  63 {
  64   self->iop = iop;
  65
  66   self->base.vtbl = &kGioFileVtbl;
  67   return 1;
  68 }
  69
  70 int GioFileRead(struct Gio  *vself,
  71                 void        *buf,
  72                 size_t      count)
  73 {
  74   struct GioFile  *self = (struct GioFile *) vself;
  75   return fread(buf, 1, count, self->iop);
  76 }
  77
  78 int GioFileWrite(struct Gio *vself,
  79                  void       *buf,
  80                  size_t     count)
  81 {
  82   struct GioFile  *self = (struct GioFile *) vself;
  83   return fwrite(buf, 1, count, self->iop);
  84 }
  85
  86 off_t GioFileSeek(struct Gio  *vself,
  87                   off_t       offset,
  88                   int         whence)
  89 {
  90   struct GioFile  *self = (struct GioFile *) vself;
  91   int             ret;
  92   ret = fseek(self->iop, offset, whence);
  93   if (-1 == ret) return -1;
  94   return ftell(self->iop);
  95 }
  96
  97 int GioFileFlush(struct Gio *vself)
  98 {
  99   struct GioFile  *self = (struct GioFile *) vself;
 100
 101   return fflush(self->iop);
 102 }
 103
 104 int GioFileClose(struct Gio *vself)
 105 {
 106   struct GioFile  *self = (struct GioFile *) vself;
 107   int             rv;
 108   rv = (EOF == fclose(self->iop)) ? -1 : 0;
 109   if (0 == rv) {
 110     self->iop = (FILE *) 0;
 111   }
 112   return rv;
 113 }
 114
 115 void  GioFileDtor(struct Gio  *vself)
 116 {
 117   struct GioFile  *self = (struct GioFile *) vself;
 118   if (0 != self->iop) {
 119     (void) fclose(self->iop);
 120   }
 121 }
 122
 123 int fggetc(struct Gio   *gp)
 124 {
 125   char    ch;
 126
 127   return (*gp->vtbl->Read)(gp, &ch, 1) == 1 ? ch : EOF;
 128 }