Changes in uspace/lib/libc/generic/io/io.c [2a5af223:ed903174] in mainline

File:

• uspace/lib/libc/generic/io/io.c (modified) (6 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) {
@@ -527 +541 @@
 }
 
-int fseek(FILE *stream, long offset, int origin)
-{
-        off_t rc = lseek(stream->fd, offset, origin);
-        if (rc == (off_t) (-1)) {
-                /* errno has been set by lseek. */
+int fseek(FILE *stream, off64_t offset, int whence)
+{
+        off64_t rc = lseek(stream->fd, offset, whence);
+        if (rc == (off64_t) (-1)) {
+                /* errno has been set by lseek64. */
                 return -1;
         }
@@ -538 +552 @@
         
         return 0;
+}
+
+off64_t ftell(FILE *stream)
+{
+        return lseek(stream->fd, 0, SEEK_CUR);
 }
 
@@ -570 +589 @@
 }
 
+void clearerr(FILE *stream)
+{
+        stream->eof = false;
+        stream->error = false;
+}
+
 int fphone(FILE *stream)
 {