Kickoff

1 files changed, 56 insertions, 0 deletions

diff --git a/mystdlib.c b/mystdlib.c
new file mode 100644
index 0000000..b53beca
--- /dev/null
+++ b/mystdlib.c
@@ -0,0 +1,56 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "mystdlib.h"
+
+MAP map_file( char *filename, int readonly )
+{
+  struct stat fstatus;
+  MAP    map = (MAP)malloc( sizeof( *map ));
+
+  if( map )
+  {
+    memset( map, 0, sizeof( *map ));
+
+    if( ( map->fh = open( filename, readonly ? O_RDONLY : O_RDWR ) ) >= 0 )
+    {
+      fstat( map->fh, &fstatus );
+      if( ( map->addr = mmap( NULL, map->size = (size_t)fstatus.st_size,
+         PROT_READ | ( readonly ? 0 : PROT_WRITE), (readonly ? 0 : MAP_SHARED), map->fh, 0) ) == MAP_FAILED )
+      {
+        fprintf( stderr, "Mapping file '%s' failed\n", filename );
+        close( map->fh ); free( map ); map = NULL;
+      }
+    } else {
+      fprintf( stderr, "Couldn't open file: '%s'\n", filename );
+      free( map ); map = NULL;
+    }
+  } else {
+    fputs( "Couldn't allocate memory", stderr );
+  }
+
+  return map;
+}
+
+void unmap_file ( MAP *pMap )
+{
+  if( !pMap || !*pMap ) return;
+  munmap( (*pMap)->addr, (*pMap)->size);
+  close( (*pMap)->fh);
+  free( *pMap ); *pMap = NULL;
+}
+
+int getfilesize( int fd, unsigned long *size)
+{
+  struct stat sb;
+  int ret;
+  if( fstat( fd, &sb )) return -1;
+  *size = sb.st_size;
+  return 0;
+}