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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/_fopen.c

@@ -0,0 +1,73 @@
+/*
+ * _fopen.c
+ *
+ * Ullrich von bassewitz, 17.06.1997
+ */
+
+
+
+#include <fcntl.h>
+#include <errno.h>
+#include "_file.h"
+
+
+
+static unsigned char amode_to_bmode (const char* mode)
+/* Convert ASCII mode (like for fopen) to binary mode (for open) */
+{
+    char	  c;
+    char 	  flag = 0;
+    unsigned char binmode = 0;
+
+    while (c = *mode++) {
+        switch(c) {
+            case 'w':
+                binmode = O_WRONLY;
+                break;
+            case 'r':
+                binmode = O_RDONLY;
+                break;
+            case '+':
+                binmode = O_RDWR;
+                break;
+            /* a,b missing */
+        }
+    }
+    if (binmode == 0) {
+    	_errno = EINVAL;
+    }
+    return binmode;
+}
+
+
+
+FILE* _fopen (const char* name, const char* mode, FILE* f)
+/* Open the specified file and fill the descriptor values into f */
+{
+    int 	  fd;
+    unsigned char binmode;
+
+
+    /* Convert ASCII mode to binary mode */
+    if ((binmode = amode_to_bmode (mode)) == 0) {
+	/* Invalid mode, _errno already set */
+        return 0;
+    }
+
+    /* Open the file */
+    fd = open (name, binmode);
+    if (fd == -1) {
+       	/* Error - _oserror is set */
+       	return 0;
+    }
+
+    /* Remember fd, mark the file as opened */
+    f->f_fd    = fd;
+    f->f_flags = _FOPEN;
+
+    /* Return the file descriptor */
+    return f;
+}
+
+
+