mirror of https://github.com/cc65/cc65.git
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
|
|
** 2020-10-15, Greg King
|
|
**
|
|
** unsigned int __fastcall__ cbm_load (const char* name,
|
|
** unsigned char device,
|
|
** void* data);
|
|
*/
|
|
|
|
#include <cbm.h>
|
|
#include <limits.h>
|
|
|
|
/* Loads file "name" from the given device to the given address, or to the load
|
|
** address of the file if "data" is the null pointer (like load"name",8,1
|
|
** in BASIC).
|
|
** Returns the number of bytes that were loaded if loading was successful;
|
|
** otherwise 0; "_oserror" contains an error-code, then.
|
|
*/
|
|
unsigned int __fastcall__ cbm_load (const char* name, unsigned char device, void* data)
|
|
{
|
|
void* load;
|
|
int length;
|
|
unsigned int size = 0;
|
|
|
|
if (cbm_open (1, device, CBM_READ, name) != 0) {
|
|
/* Can't load from a file that can't be openned. */
|
|
return 0;
|
|
}
|
|
|
|
/* Get the file's load address. */
|
|
if (cbm_read (1, &load, sizeof load) != sizeof load) {
|
|
/* Either the file wasn't found, or it was too short. (Note:
|
|
** the computer openned a file even if the drive couldn't open one.)
|
|
*/
|
|
cbm_close (1);
|
|
return 0;
|
|
}
|
|
|
|
/* If "data" doesn't hold an address, then use the file's address. */
|
|
if (data == (void*)0x0000) {
|
|
data = load;
|
|
}
|
|
|
|
/* Pull the file into RAM. [Note that, if cbm_read() grabbed more
|
|
** than 32767 bytes at a time, then its result would look negative,
|
|
** which would cancel the load.]
|
|
*/
|
|
do {
|
|
size += (length = cbm_read (1, data, INT_MAX));
|
|
data = (unsigned char*)data + length;
|
|
} while (length == INT_MAX && cbm_k_readst() == 0);
|
|
cbm_close (1);
|
|
|
|
/* "length" is -1 if there was an error. */
|
|
if (length < 0) {
|
|
size = 0;
|
|
}
|
|
|
|
return size;
|
|
}
|