16da56ea9b
Includes truncation support in tmpfs, and changes the signure of the VFS open() method. Also tweaked some comment style in the VFS.
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* A device that returns "hello world" when read from.
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*/
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#include <system.h>
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#include <fs.h>
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uint32_t read_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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uint32_t write_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
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void open_hello(fs_node_t *node, unsigned int flags);
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void close_hello(fs_node_t *node);
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char hello[] = "hello world";
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uint32_t read_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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uint32_t s = 0;
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int d = strlen(hello);
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while (s < size) {
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buffer[s] = hello[offset % d];
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offset++;
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s++;
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}
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return size;
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}
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uint32_t write_hello(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
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return size;
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}
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void open_hello(fs_node_t * node, unsigned int flags) {
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return;
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}
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void close_hello(fs_node_t * node) {
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return;
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}
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fs_node_t * hello_device_create() {
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fs_node_t * fnode = malloc(sizeof(fs_node_t));
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memset(fnode, 0x00, sizeof(fs_node_t));
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fnode->inode = 0;
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strcpy(fnode->name, "hello");
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fnode->uid = 0;
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fnode->gid = 0;
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fnode->length = strlen(hello);
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fnode->flags = FS_CHARDEVICE;
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fnode->read = read_hello;
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fnode->write = write_hello;
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fnode->open = open_hello;
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fnode->close = close_hello;
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fnode->readdir = NULL;
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fnode->finddir = NULL;
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fnode->ioctl = NULL;
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return fnode;
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}
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