X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fsetvbuf.c;h=2c333382be537002c621b6299ff2fb14ae37545a;hb=55cf35957bf8dec0a489ba758c02c83303a5eb50;hp=125a73f8808a32d341cd67710c1f0c0d7b9694e2;hpb=393020b6e48719d27699dea6b29e53025bbd5123;p=pdclib

diff --git a/functions/stdio/setvbuf.c b/functions/stdio/setvbuf.c
index 125a73f..2c33338 100644
--- a/functions/stdio/setvbuf.c
+++ b/functions/stdio/setvbuf.c
@@ -21,10 +21,11 @@ int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_res
                we don't want to e.g. flush the stream for every character of a
                stream being printed.
             */
+            /* TODO: Check this */
             break;
         case _IOFBF:
         case _IOLBF:
-            if ( size > INT_MAX || size == NULL )
+            if ( size > INT_MAX || size == 0 )
             {
                 /* PDCLib only supports buffers up to INT_MAX in size. A size
                    of zero doesn't make sense.
@@ -36,31 +37,23 @@ int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_res
                 /* User requested buffer size, but leaves it to library to
                    allocate the buffer.
                 */
+                /* If current buffer is big enough for requested size, but not
+                   over twice as big (and wasting memory space), we use the
+                   current buffer (i.e., do nothing), to save the malloc() / 
+                   free() overhead.
+                */
                 if ( ( stream->bufsize < size ) || ( stream->bufsize > ( size << 1 ) ) )
                 {
-                    /* If current buffer is big enough for requested size, but
-                       not over twice as big (and wasting memory space), we use
-                       the current buffer (i.e., do nothing), to save the
-                       malloc() / free() overhead.
-                    */
-                    /* Free the buffer allocated by fopen(), and allocate a new
-                       one.
-                    */
+                    /* Buffer too small, or much too large - allocate. */
                     if ( ( buf = (char *) malloc( size ) ) == NULL )
                     {
                         /* Out of memory error. */
                         return -1;
                     }
+                    /* This buffer must be free()d on fclose() */
+                    stream->status |= _PDCLIB_FREEBUFFER;
                 }
             }
-            else
-            {
-                /* User provided buffer -> set flag to not free() the buffer
-                   on fclose().
-                */
-                stream->status &= ~ _PDCLIB_LIBBUFFER;
-            }
-            free( stream->buffer );
             stream->buffer = buf;
             stream->bufsize = size;
             break;
@@ -87,32 +80,31 @@ int setvbuf( struct _PDCLIB_file_t * _PDCLIB_restrict stream, char * _PDCLIB_res
 int main( void )
 {
 #ifndef REGTEST
-    char const * const filename = "testfile";
     char buffer[ BUFFERSIZE ];
     FILE * fh;
-    remove( filename );
+    remove( testfile );
     /* full buffered, user-supplied buffer */
-    TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+    TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
     TESTCASE( setvbuf( fh, buffer, _IOFBF, BUFFERSIZE ) == 0 );
     TESTCASE( fh->buffer == buffer );
     TESTCASE( fh->bufsize == BUFFERSIZE );
     TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOFBF );
     TESTCASE( fclose( fh ) == 0 );
-    TESTCASE( remove( filename ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
     /* line buffered, lib-supplied buffer */
-    TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+    TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
     TESTCASE( setvbuf( fh, NULL, _IOLBF, BUFFERSIZE ) == 0 );
     TESTCASE( fh->buffer != NULL );
     TESTCASE( fh->bufsize == BUFFERSIZE );
     TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IOLBF );
     TESTCASE( fclose( fh ) == 0 );
-    TESTCASE( remove( filename ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
     /* not buffered, user-supplied buffer */
-    TESTCASE( ( fh = fopen( filename, "w" ) ) != NULL );
+    TESTCASE( ( fh = fopen( testfile, "w" ) ) != NULL );
     TESTCASE( setvbuf( fh, buffer, _IONBF, BUFFERSIZE ) == 0 );
     TESTCASE( ( fh->status & ( _IOFBF | _IONBF | _IOLBF ) ) == _IONBF );
     TESTCASE( fclose( fh ) == 0 );
-    TESTCASE( remove( filename ) == 0 );
+    TESTCASE( remove( testfile ) == 0 );
 #else
     puts( " NOTEST setvbuf() test driver is PDCLib-specific." );
 #endif