Move everything into a new repo.

1 files changed, 57 insertions, 0 deletions

diff --git a/userland/libc/stdio/fopen.c b/userland/libc/stdio/fopen.c
new file mode 100644
index 0000000..a29c7ef
--- /dev/null
+++ b/userland/libc/stdio/fopen.c
@@ -0,0 +1,57 @@
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <stdint.h>
+#include <stdio.h>
+
+// FIXME: All modes not implemented
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html
+FILE *fopen(const char *pathname, const char *mode) {
+  uint8_t read = 0;
+  uint8_t write = 0;
+  uint8_t append = 0;
+  // FIXME: Not parsed correctly
+  for (; *mode; mode++) {
+    // r or rb
+    // Open file for reading.
+    // w or wb
+    // Truncate to zero length or create file for writing.
+    // a or ab
+    // Append; open or create file for writing at
+    // end-of-file.
+    switch (*mode) {
+    case 'r':
+      read = 1;
+      break;
+    case 'w':
+      write = 1;
+      break;
+    case 'a':
+      append = 1;
+      break;
+    }
+  }
+  int flag = 0;
+  if (read)
+    flag |= O_READ;
+  if (write)
+    flag |= O_WRITE;
+
+  int fd = open(pathname, flag, 0);
+  if (-1 == fd)
+    return NULL;
+
+  struct stat s;
+  stat(pathname, &s);
+
+  FILE *r = malloc(sizeof(FILE));
+  r->read = read_fd;
+  r->write = write_fd;
+  r->seek = seek_fd;
+  r->has_error = 0;
+  r->is_eof = 0;
+  r->offset_in_file = 0;
+  r->file_size = s.st_size;
+  r->cookie = NULL;
+  r->fd = fd;
+  return r;
+}