Changes in uspace/lib/libc/generic/io/io.c [2a5af223:08232ee] in mainline

File:

• uspace/lib/libc/generic/io/io.c (modified) (4 diffs)

uspace/lib/libc/generic/io/io.c

@@ -341 +341 @@
 size_t fread(void *buf, size_t size, size_t nmemb, FILE *stream)
 {
-        size_t left = size * nmemb;
-        size_t done = 0;
-        
+        size_t left, done;
+
+        if (size == 0 || nmemb == 0)
+                return 0;
+
         /* Make sure no data is pending write. */
         _fflushbuf(stream);
+
+        left = size * nmemb;
+        done = 0;
         
         while ((left > 0) && (!stream->error) && (!stream->eof)) {
@@ -365 +370 @@
 static size_t _fwrite(const void *buf, size_t size, size_t nmemb, FILE *stream)
 {
-        size_t left = size * nmemb;
-        size_t done = 0;
-        
+        size_t left;
+        size_t done;
+
+        if (size == 0 || nmemb == 0)
+                return 0;
+
+        left = size * nmemb;
+        done = 0;
+
         while ((left > 0) && (!stream->error)) {
                 ssize_t wr;
@@ -421 +432 @@
         uint8_t b;
         bool need_flush;
-        
+
+        if (size == 0 || nmemb == 0)
+                return 0;
+
         /* If not buffered stream, write out directly. */
         if (stream->btype == _IONBF) {
@@ -540 +554 @@
 }
 
+int ftell(FILE *stream)
+{
+        off_t rc = lseek(stream->fd, 0, SEEK_CUR);
+        if (rc == (off_t) (-1)) {
+                /* errno has been set by lseek. */
+                return -1;
+        }
+
+        return rc;
+}
+
 void rewind(FILE *stream)
 {