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71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
#include "devoptab_sd.h"
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ssize_t
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__wut_fs_read(struct _reent *r,
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void *fd,
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char *ptr,
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size_t len)
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{
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FSStatus rc;
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u32 bytes, bytesRead = 0;
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__wut_fs_file_t *file = (__wut_fs_file_t *)fd;
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// Check that the file was opened with read access
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if ((file->flags & O_ACCMODE) == O_WRONLY) {
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r->_errno = EBADF;
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return -1;
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}
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// Set up command block
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FSCmdBlock fsCmd;
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FSInitCmdBlock(&fsCmd);
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FSStat fsstat;
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rc = FSGetStatFile(__wut_devoptab_sd_client, &fsCmd, file->fd, &fsstat, -1);
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if(rc < 0) {
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r->_errno = __wut_fs_translate_error(rc);
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return -1;
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}
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// Copy to internal buffer and read in chunks.
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u8 *tmp_buffer = memalign(0x40, 8192);
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while(len > 0) {
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size_t toRead = len;
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if (toRead > 8192) {
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toRead = 8192;
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}
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// Write the data
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rc = FSReadFile(__wut_devoptab_sd_client, &fsCmd, tmp_buffer, 1, toRead, file->fd, 0, -1);
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if(rc <= 0)
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{
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free(tmp_buffer);
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// Return partial transfer
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if (bytesRead > 0) {
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return bytesRead;
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}
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r->_errno = __wut_fs_translate_error(rc);
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return -1;
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} else {
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bytes = rc;
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}
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// Copy to internal buffer
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memcpy(ptr, tmp_buffer, bytes);
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file->offset += bytes;
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bytesRead += bytes;
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ptr += bytes;
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len -= bytes;
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}
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free(tmp_buffer);
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return bytesRead;
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}
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