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cc65/libsrc/cbm/cbm_write.c
mrintsch b2e0ed603e cbm_write() added
changed/added some comments
all cbm_* IO functions are using _oserror now


git-svn-id: svn://svn.cc65.org/cc65/trunk@682 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-03-30 18:18:40 +00:00

33 lines
726 B
C

/*
* Marc 'BlackJack' Rintsch, 25.03.2001
*
* int cbm_write(unsigned char lfn, void* buffer, unsigned int size);
*/
#include <cbm.h>
extern unsigned char _oserror;
int cbm_write(unsigned char lfn, void* buffer, unsigned int size) {
static unsigned int byteswritten;
/* if we can't change to the outputchannel #lfn then return an error */
if (_oserror = cbm_k_ckout(lfn)) return -1;
byteswritten = 0;
while (byteswritten<size && !cbm_k_readst()) {
cbm_k_bsout(((unsigned char*)buffer)[byteswritten++]);
}
if (cbm_k_readst()) {
_oserror = 5; /* device not present */
byteswritten = -1;
}
cbm_k_clrch();
return byteswritten;
}