Changeset 647 for trunk/libs/mini-libc

Timestamp:

Oct 22, 2019, 1:48:51 PM (6 years ago)

Author:

alain

Message:

...miscelaneous...

Location:

trunk/libs/mini-libc

Files:

• stdio.c (modified) (3 diffs)
• stdio.h (modified) (3 diffs)

trunk/libs/mini-libc/stdio.c

@@ -412 +412 @@
 
     // compute nbytes
-    unsigned int nbytes = size * nitems;
+    int nbytes = size * nitems;
 
     if( hal_user_syscall( SYS_READ,
@@ -435 +435 @@
 
     // compute nbytes
-    unsigned int nbytes = size * nitems;
+    int nbytes = size * nitems;
 
     if( hal_user_syscall( SYS_WRITE,
@@ -444 +444 @@
 
 }  // end fwrite() 
+
+//////////////////////////////////////////
+unsigned int fseek( FILE         * stream,
+                    unsigned int   offset,
+                    int            whence )
+{
+    // check stream valid
+    if( stream->key != VALID_OPEN_FILE ) return -1;
+
+    // get file descriptor from stream pointer
+    int fd = stream->fd;
+
+    return( hal_user_syscall( SYS_LSEEK,
+                              (reg_t)fd,
+                              (reg_t)offset,
+                              (reg_t)whence, 0 ) );
+}  // end fseek() 
 
 /////////////////////////////////

trunk/libs/mini-libc/stdio.h

@@ -146 +146 @@
  * It can be a regular file or a character oriented input device.
  *********************************************************************************************
+ * @ buffer    : pointer on user buffer.
+ * @ size      : item size in bytes.
+ * @ nitems    : number of items.
  * @ stream    : pointer on a stream.
- * @ format    : formated string.
  * @ returns actual number of items read if success / returns 0 if failure.
  ********************************************************************************************/
@@ -160 +162 @@
  * It can be a  regular file or a character oriented input device.
  *********************************************************************************************
+ * @ buffer    : pointer on user buffer.
+ * @ size      : item size in bytes.
+ * @ nitems    : number of items.
  * @ stream    : pointer on a stream.
- * @ format    : formated string.
  * @ returns actual number of written items if success / returns 0 if failure.
  ********************************************************************************************/
@@ -169 +173 @@
                      FILE         * stream );  
 
+/*********************************************************************************************
+ * This function moves <nitems> oblects, each <size> bytes long, from an input stream
+ * identified by <stream>, to the user buffer identified by the <buffer> argument.
+ * It can be a regular file or a character oriented input device.
+ *********************************************************************************************
+ * @ stream    : pointer on a stream.
+ * @ offset    : used to compute new offset value.
+ * @ whence    : operation type (SEEK_SET / SEEK_CUR / SEEK_END)
+ * @ return 0 if success / returns -1 if failure.
+ ********************************************************************************************/
+unsigned int fseek( FILE        * stream,
+                    unsigned int  offset,
+                    int           whence );
+
+
 #endif  // _STDIO_H_