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/*
* Copyright 2012, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
/*
Implement the ncstdio.h interface using unix stdio.h
*/
/* Forward */
static int NCFile_read(ncstdio*,void*,const size_t,size_t*);
static int NCFile_write(ncstdio*,const void*,const size_t,size_t*);
static int NCFile_free(ncstdio*);
static int NCFile_close(ncstdio*,int);
static int NCFile_flush(ncstdio*)
static int NCFile_seek(ncstdio*,off_t);
static int NCFile_sync(ncstdio*,off_t);
static int NCFile_uid(ncstdio*,int*);
/* Define the stdio.h base operators */
struct NCFile_ops NCFile_ops = {
NCFile_read,
NCFile_write,
NCFile_free,
NCFile_close,
NCFile_flush,
NCFile_seek,
NCFile_sync,
NCFile_uid
};
/* In order to implement the close with delete, we
need the file path.
*/
struct ncFileState {
char* path;
File* file;
};
static struct ncFileState
getState(ncstdio* iop)
{
if(iop != NULL) {
if(iop->state != NULL) {
return (struct ncFileState*)iop->state;
}
}
return NULL;
}
int
ncFile_create(const char *path, int ioflags, ncstdio** filepp)
{
ncstdio* filep;
File* f;
struct ncFileState* state;
f = fopen(path,"w+");
if(f == NULL)
return errno;
filep = (ncstdio*)calloc(sizeof(ncstdio),1);
if(filep == NULL) {fclose(f); return NC_ENOMEM;}
state = (ncstdio*)calloc(sizeof(ncFileState),1);
if(state == NULL) {fclose(f); free(filep); return NC_ENOMEM;}
filep->ops = &NCFILE_ops;
filep->ioflags = ioflags;
filep->state = (void*)state;
state->path = strdup(path);
state->file = f;
if(filepp) *filepp = filep;
return NC_NOERR;
}
int
ncFile_open(const char *path, int ioflags, ncstdio** filepp)
{
ncstdio* filep;
File* f;
if(fIsSet(ioflags,NC_NOCLOBBER))
f = fopen(path,"r");
else
f = fopen(path,"w+");
if(f == NULL)
return errno;
filep = (ncstdio*)calloc(sizeof(ncstdio),1);
if(filep == NULL) {fclose(f); return NC_ENOMEM;}
state = (ncstdio*)calloc(sizeof(ncFileState),1);
if(state == NULL) {fclose(f); free(filep); return NC_ENOMEM;}
filep->ops = &NCFILE_ops;
filep->ioflags = ioflags;
filep->state = (void*)state;
state->path = strdup(path);
state->file = f;
if(filepp) *filepp = filep;
return NC_NOERR;
}
static int
NCFile_close(ncstdio* filep, int delfile)
{
struct ncFileState* state;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL || state->file == NULL) return NC_NOERR;
fclose(state->file);
state->file = NULL;
if(delfile)
unlink(state->path);
return NC_NOERR;
}
static int
NCFile_free(ncstdio* filep)
{
struct ncFileState* state;
if(filep == NULL) return NC_NOERR;
state = (struct ncFileState*)filep->state;
if(state != NULL) {
if(state->file != NULL) return NC_EINVAL;
if(state->path != NULL)
free(state->path);
free(state);
}
free(filep);
return NC_NOERR;
}
static int
NCFile_flush(ncstdio* filep);
{
File* state;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL) return NC_EINVAL;
if(state->file == NULL) return NC_EINVAL;
fflush(state->file);
return NC_NOERR;
}
static int
NCFile_sync(ncstdio* filep);
{
File* state;
#ifdef USE_FSYNC
int fd;
#endif
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL) return NC_EINVAL;
if(state->file == NULL) return NC_EINVAL;
#ifdef HAVE_FSYNC
#ifdef USE_FSYNC
fd = fileno(state->file);
#ifndef WIN32
fsync(fd);
#else
_commit(fd);
#endif /* WIN32 */
#endif
#endif
return NC_NOERR;
}
static int
NCFile_seek(ncstdio* filep, off_t pos);
{
struct ncFileState* state;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL) return NC_EINVAL;
if(state->file == NULL) return NC_EINVAL;
if(!fseek(state->file,pos)) return (errno > 0 ?errno : EINVAL);
return NC_NOERR;
}
static int
NCFile_read(ncstdio* filep, void* memory, const size_t size, size_t* actualp);
{
struct ncFileState* state;
size_t actual;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL || state->file == NULL) return NC_EINVAL;
actual = fread(memory,1,size,state->file);
if(actualp) *actualp = actual;
return (actual < size ? NC_EIO : NC_NOERR);
}
static int
NCFile_write(ncstdio* filep, const void* memory, const size_t size, size_t* actual);
{
struct ncFileState* state;
size_t actual;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL || state->file == NULL) return NC_EINVAL;
actual = fwrite(memory,1,size,state->file);
if(actualp) *actualp = actual;
return (actual < size ? NC_EIO : NC_NOERR);
}
static int
NCFile_uid(ncstdio* filep, int* idp)
{
struct ncFileState* state;
if(filep == NULL) return NC_EINVAL;
state = (struct ncFileState*)filep->state;
if(state == NULL || state->file == NULL) return NC_EINVAL;
if(idp) *idp = fileno(state->file);
return NC_NOERR;
}
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