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#include <init/stdlib.h>
#include <shared/printf.h>
#include <shared/syscalls.h>
libc_file __stdin = {.fd = -1};
libc_file __stdout = {.fd = -1};
static void backend_file(void *arg, const char *buf, size_t len) {
file_write((libc_file*)arg, buf, len);
}
int printf(const char *fmt, ...) {
int ret = 0;
va_list argp;
va_start(argp, fmt);
ret = __printf_internal(fmt, argp, backend_file, (void*)&__stdout);
va_end(argp);
return ret;
}
int file_open(libc_file *f, const char *path) {
f->pos = 0;
f->eof = false;
f->fd = _syscall_open(path, strlen(path));
if (f->fd < 0) return f->fd;
return 0;
}
int file_read(libc_file *f, char *buf, size_t len) {
if (f->fd < 0) return -1;
int res = _syscall_read(f->fd, buf, len, f->pos);
if (res < 0) return res;
if (res == 0 && len > 0) f->eof = true;
f->pos += res;
return res;
}
int file_write(libc_file *f, const char *buf, size_t len) {
if (f->fd < 0) return -1;
int res = _syscall_write(f->fd, buf, len, f->pos);
if (res < 0) return res;
f->pos += res;
return res;
}
void file_close(libc_file *f) {
if (f->fd > 0) _syscall_close(f->fd);
}
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