Changeset ab547063 in mainline

Timestamp:

2011-06-10T10:54:07Z (13 years ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

4f4b4e7, 9ec25a6

Parents:

41811af

Message:

Partially implement freopen()

File:

• uspace/lib/posix/stdio.c (modified) (2 diffs)

uspace/lib/posix/stdio.c

@@ -35 +35 @@
 #define POSIX_INTERNAL
 
+#include <assert.h>
+#include "errno.h"
 #include "common.h"
 #include "stdio.h"
+#include "string.h"
+/* not the best of solutions, but freopen will eventually
+   need to be implemented in libc anyway */
+#include "../c/generic/private/stdio.h"
 
 FILE *posix_freopen(const char *restrict filename,
@@ -42 +48 @@
                     FILE *restrict stream)
 {
-        // TODO
-        not_implemented();
+        assert(mode != NULL);
+        assert(stream != NULL);
+
+        if (filename == NULL) {
+                // TODO
+                
+                /* print error to stderr as well, to avoid hard to find problems
+                   with buggy apps that expect this to work */
+                fprintf(stderr, "ERROR: Application wants to use freopen() to change mode of opened stream.\n"
+                                "       libposix does not support that yet, the application may function improperly.\n");
+                errno = ENOTSUP;
+                return NULL;
+        }
+
+        FILE* copy = malloc(sizeof(FILE));
+        if (copy == NULL) {
+                errno = ENOMEM;
+                return NULL;
+        }
+        memcpy(copy, stream, sizeof(FILE));
+        fclose(copy);   /* copy is now freed */
+        
+        copy = fopen(filename, mode);         /* open new stream */
+        if (copy == NULL) {
+                /* fopen() sets errno */
+                return NULL;
+        }
+        
+        /* move the new stream to the original location */
+        memcpy(stream, copy, sizeof (FILE));
+        free(copy);
+        
+        /* update references in the file list */
+        stream->link.next->prev = &stream->link;
+        stream->link.prev->next = &stream->link;
+        
+        return stream;
 }