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style nits and other cleanups

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This commit is contained in:
twinaphex 2015-02-15 23:29:13 +01:00
parent acb6d6b0f3
commit b1558d651e
1 changed files with 55 additions and 31 deletions
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86
nbio/nbio_stdio.c
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@ -2,38 +2,54 @@
#include <stdio.h>
#include <stdlib.h>
struct nbio_t {
FILE* f;
void* data;
size_t progress;
size_t len;
/*
* possible values:
* NBIO_READ, NBIO_WRITE - obvious
* -1 - currently doing nothing
* -2 - the pointer was reallocated since the last operation
*/
signed char op;
struct nbio_t
{
FILE* f;
void* data;
size_t progress;
size_t len;
/*
* possible values:
* NBIO_READ, NBIO_WRITE - obvious
* -1 - currently doing nothing
* -2 - the pointer was reallocated since the last operation
*/
signed char op;
};
static const char * modes[]={ "rb", "wb", "r+b" };
struct nbio_t* nbio_open(const char * filename, enum nbio_mode_t mode)
{
struct nbio_t* handle;
FILE* f=fopen(filename, modes[mode]);
if (!f) return NULL;
if (!f)
return NULL;
handle=(struct nbio_t*)malloc(sizeof(struct nbio_t));
handle->f = f;
if (!handle)
return NULL;
handle->f = f;
handle->len = 0;
if (mode != NBIO_WRITE)
{
fseek(handle->f, 0, SEEK_END);
handle->len = ftell(handle->f);
}
else handle->len = 0;
handle->data = malloc(handle->len);
if (!handle->data)
{
free(handle);
return NULL;
}
handle->progress = handle->len;
handle->op = -2;
handle->op = -2;
return handle;
}
@ -45,8 +61,10 @@ void nbio_begin_read(struct nbio_t* handle)
puts("ERROR - attempted file read operation while busy");
abort();
}
fseek(handle->f, 0, SEEK_SET);
handle->op = NBIO_READ;
handle->op = NBIO_READ;
handle->progress = 0;
}
@ -57,6 +75,7 @@ void nbio_begin_write(struct nbio_t* handle)
puts("ERROR - attempted file write operation while busy");
abort();
}
fseek(handle->f, 0, SEEK_SET);
handle->op = NBIO_WRITE;
handle->progress = 0;
@ -65,22 +84,24 @@ void nbio_begin_write(struct nbio_t* handle)
bool nbio_iterate(struct nbio_t* handle, size_t* progress, size_t* len)
{
size_t amount = 65536;
if (amount > handle->len - handle->progress)
{
amount = handle->len - handle->progress;
}
if (handle->op == NBIO_READ)
{
fread((char*)handle->data + handle->progress, 1,amount, handle->f);
}
if (handle->op == NBIO_WRITE)
{
fwrite((char*)handle->data + handle->progress, 1,amount, handle->f);
}
handle->progress += amount;
if (progress) *progress = handle->progress;
if (len) *len = handle->len;
if (handle->progress == handle->len) handle->op = -1;
if (progress)
*progress = handle->progress;
if (len)
*len = handle->len;
if (handle->progress == handle->len)
handle->op = -1;
return (handle->op < 0);
}
@ -96,16 +117,19 @@ void nbio_resize(struct nbio_t* handle, size_t len)
puts("ERROR - attempted file shrink operation, not implemented");
abort();
}
handle->len = len;
handle->len = len;
handle->data = realloc(handle->data, handle->len);
handle->op = -1;
handle->op = -1;
}
void* nbio_get_ptr(struct nbio_t* handle, size_t* len)
{
if (len) *len = handle->len;
if (handle->op == -1) return handle->data;
else return NULL;
if (len)
*len = handle->len;
if (handle->op == -1)
return handle->data;
return NULL;
}
void nbio_free(struct nbio_t* handle)