[3/4] tools/nolibc: implement fd-based FILE streams
Commit Message
From: Thomas Weißschuh <linux@weissschuh.net>
This enables the usage of the stream APIs with arbitrary filedescriptors.
It will be used by a future testcase.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
tools/include/nolibc/stdio.h | 95 ++++++++++++++++++++++++++----------
1 file changed, 68 insertions(+), 27 deletions(-)
@@ -21,17 +21,75 @@
#define EOF (-1)
#endif
-/* just define FILE as a non-empty type */
+/* just define FILE as a non-empty type. The value of the pointer gives
+ * the FD: FILE=~fd for fd>=0 or NULL for fd<0. This way positive FILE
+ * are immediately identified as abnormal entries (i.e. possible copies
+ * of valid pointers to something else).
+ */
typedef struct FILE {
char dummy[1];
} FILE;
-/* We define the 3 common stdio files as constant invalid pointers that
- * are easily recognized.
- */
-static __attribute__((unused)) FILE* const stdin = (FILE*)-3;
-static __attribute__((unused)) FILE* const stdout = (FILE*)-2;
-static __attribute__((unused)) FILE* const stderr = (FILE*)-1;
+static __attribute__((unused)) FILE* const stdin = (FILE*)(intptr_t)~STDIN_FILENO;
+static __attribute__((unused)) FILE* const stdout = (FILE*)(intptr_t)~STDOUT_FILENO;
+static __attribute__((unused)) FILE* const stderr = (FILE*)(intptr_t)~STDERR_FILENO;
+
+/* provides a FILE* equivalent of fd. The mode is ignored. */
+static __attribute__((unused))
+FILE *fdopen(int fd, const char *mode __attribute__((unused)))
+{
+ if (fd < 0) {
+ SET_ERRNO(EBADF);
+ return NULL;
+ }
+ return (FILE*)(intptr_t)~fd;
+}
+
+/* provides the fd of stream. */
+static __attribute__((unused))
+int fileno(FILE *stream)
+{
+ intptr_t i = (intptr_t)stream;
+
+ if (i >= 0) {
+ SET_ERRNO(EBADF);
+ return -1;
+ }
+ return ~i;
+}
+
+/* flush a stream. */
+static __attribute__((unused))
+int fflush(FILE *stream)
+{
+ intptr_t i = (intptr_t)stream;
+
+ /* NULL is valid here. */
+ if (i > 0) {
+ SET_ERRNO(EBADF);
+ return -1;
+ }
+
+ /* Don't do anything, nolibc does not support buffering. */
+ return 0;
+}
+
+/* flush a stream. */
+static __attribute__((unused))
+int fclose(FILE *stream)
+{
+ intptr_t i = (intptr_t)stream;
+
+ if (i >= 0) {
+ SET_ERRNO(EBADF);
+ return -1;
+ }
+
+ if (close(~i))
+ return EOF;
+
+ return 0;
+}
/* getc(), fgetc(), getchar() */
@@ -41,14 +99,8 @@ static __attribute__((unused))
int fgetc(FILE* stream)
{
unsigned char ch;
- int fd;
- if (stream < stdin || stream > stderr)
- return EOF;
-
- fd = 3 + (long)stream;
-
- if (read(fd, &ch, 1) <= 0)
+ if (read(fileno(stream), &ch, 1) <= 0)
return EOF;
return ch;
}
@@ -68,14 +120,8 @@ static __attribute__((unused))
int fputc(int c, FILE* stream)
{
unsigned char ch = c;
- int fd;
-
- if (stream < stdin || stream > stderr)
- return EOF;
-
- fd = 3 + (long)stream;
- if (write(fd, &ch, 1) <= 0)
+ if (write(fileno(stream), &ch, 1) <= 0)
return EOF;
return ch;
}
@@ -96,12 +142,7 @@ static __attribute__((unused))
int _fwrite(const void *buf, size_t size, FILE *stream)
{
ssize_t ret;
- int fd;
-
- if (stream < stdin || stream > stderr)
- return EOF;
-
- fd = 3 + (long)stream;
+ int fd = fileno(stream);
while (size) {
ret = write(fd, buf, size);