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Get read working a little bit more. Need to handle edge cases!

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This commit is contained in:
Byron Lathi
2023-12-05 23:29:00 -08:00
parent 4c3c3fd731
commit 066bb0ee8c
5 changed files with 21 additions and 14 deletions
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14
sw/kernel/filesystems/fat32_c.c
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@@ -13,7 +13,7 @@ int8_t fd_val;
//TODO
int8_t fat32_file_write(int8_t fd, const void* buf, size_t nbytes) {
size_t fat32_file_write(int8_t fd, const void* buf, size_t nbytes) {
(void)fd;
(void)buf;
(void)nbytes;
@@ -62,7 +62,7 @@ int8_t fat32_file_open(const char* filename) {
return fd;
}
int8_t fat32_file_read(int8_t fd, void* buf, size_t nbytes) {
size_t fat32_file_read(int8_t fd, void* buf, size_t nbytes) {
uint16_t i;
uint8_t error;
size_t offset;
@@ -84,11 +84,17 @@ int8_t fat32_file_read(int8_t fd, void* buf, size_t nbytes) {
for (i = 0; i < cluster_seq; i++) {
cluster = fat32_next_cluster(cluster);
}
offset = fdesc->file_pos % 512;
if (offset + nbytes > 512) {
cprintf("Need to do something about this!\n");
}
fat32_read_cluster(cluster, sd_buf);
memcpy(buf, sd_buf, nbytes);
memcpy(buf, sd_buf + offset, nbytes);
fdesc->file_pos += nbytes;
return error;
return nbytes;
}
int8_t fat32_read_cluster(uint32_t cluster, void* buf) {