Diff of /src/runtime/wrap.c [000000] .. [a18f0a] Maximize Restore

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+/*
+ * wrappers around low-level operations to provide a simpler interface
+ * to the operations that Lisp needs
+ *
+ * The functions in this file are typically called directly from Lisp.
+ * Thus, when their signature changes, they don't need updates in a .h
+ * file somewhere, but they do need updates in the Lisp code. FIXME:
+ * It would be nice to enforce this at compile time. It mighn't even
+ * be all that hard: make the cross-compiler versions of DEF-ALIEN-FOO
+ * macros accumulate strings in a list which then gets written out at
+ * the end of sbcl2.h at the end of cross-compilation, then rerun
+ * 'make' in src/runtime/ using the new sbcl2.h as sbcl.h (and make
+ * sure that all the files in src/runtime/ include sbcl.h). */
+
+/*
+ * This software is part of the SBCL system. See the README file for
+ * more information.
+ *
+ * This software is derived from the CMU CL system, which was
+ * written at Carnegie Mellon University and released into the
+ * public domain. The software is in the public domain and is
+ * provided with absolutely no warranty. See the COPYING and CREDITS
+ * files for more information.
+ */
+
+#include <sys/types.h>
+#include <dirent.h>
+#include <string.h>
+
+#include "util.h"
+   
+/*
+ * stuff needed by CL:DIRECTORY and other Lisp directory operations
+ */
+
+/* Unix directory operations think of "." and ".." as filenames, but
+ * Lisp directory operations do not. */
+int
+is_lispy_filename(const char *filename)
+{
+    return strcmp(filename, ".") && strcmp(filename, "..");
+}
+
+/* Return a zero-terminated array of strings holding the Lispy filenames
+ * (i.e. excluding the Unix magic "." and "..") in the named directory. */
+char**
+alloc_directory_lispy_filenames(const char *directory_name)
+{
+    DIR *dir_ptr;
+    char **result = 0;
+
+    if (dir_ptr = opendir(directory_name)) { /* if opendir success */
+
+	struct voidacc va;
+
+	if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
+	    struct dirent *dirent_ptr;
+
+	    while (dirent_ptr = readdir(dir_ptr)) { /* until end of data */
+		char* original_name = dirent_ptr->d_name;
+		if (is_lispy_filename(original_name)) {
+		    /* strdup(3) is in Linux and *BSD. If you port
+		     * somewhere else that doesn't have it, it's easy
+		     * to reimplement. */
+		    char* dup_name = strdup(original_name);
+		    if (!dup_name) { /* if strdup failure */
+			goto dtors;
+		    }
+		    if (voidacc_acc(&va, dup_name)) { /* if acc failure */
+			goto dtors; 
+		    }
+		}
+	    }
+	    result = (char**)voidacc_give_away_result(&va);
+	}
+
+    dtors:
+	voidacc_dtor(&va);
+	/* ignoring closedir(3) return code, since what could we do?
+	 *
+	 * "Never ask questions you don't want to know the answer to."
+	 * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
+	closedir(dir_ptr);
+    }
+
+    return result;
+}
+
+/* Free a result returned by alloc_directory_lispy_filenames. */
+void
+free_directory_lispy_filenames(char** directory_lispy_filenames)
+{
+    char** p;
+
+    /* Free the strings. */
+    for (p = directory_lispy_filenames; *p; ++p) {
+	free(*p);
+    }
+
+    /* Free the table of strings. */
+    free(directory_lispy_filenames);
+}