0.7.4.40:

[sbcl.git] / src / runtime / wrap.c

diff --git a/src/runtime/wrap.c b/src/runtime/wrap.c
index 23bc881..a3d8881 100644 (file)
--- a/src/runtime/wrap.c
+++ b/src/runtime/wrap.c
@@ -6,7 +6,7 @@
  * 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
+ * be all that hard: make the cross-compiler versions of DEFINE-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
@@ -29,10 +29,16 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <pwd.h>
+#include <stdio.h>
 
 #include "runtime.h"
 #include "sbcl.h"
 #include "util.h"
+
+/* KLUDGE: Neither the OpenBSD nor the Linux man page give a header
+ * file to find this in (?). -- WHN 2002-02-07 */
+extern char **environ;
 \f   
 /*
  * stuff needed by CL:DIRECTORY and other Lisp directory operations
@@ -120,7 +126,7 @@ wrapped_readlink(char *path)
     int bufsiz = strlen(path) + 16;
     while (1) {
        char *result = malloc(bufsiz);
-       int n_read = readlink(path, result, n_read);
+       int n_read = readlink(path, result, bufsiz);
        if (n_read < 0) {
            free(result);
            return 0;
@@ -224,3 +230,68 @@ fstat_wrapper(int filedes, struct stat_wrapper *buf)
        copy_to_stat_wrapper(buf, &real_buf); 
     return ret;
 }
+\f
+/*
+ * getpwuid() stuff
+ */
+
+/* Return a newly-allocated string holding the username for "uid", or
+ * NULL if there's no such user.
+ *
+ * KLUDGE: We also return NULL if malloc() runs out of memory
+ * (returning strdup() result) since it's not clear how to handle that
+ * error better. -- WHN 2001-12-28 */
+char *
+uid_username(int uid)
+{
+    struct passwd *p = getpwuid(uid);
+    if (p) {
+       /* The object *p is a static struct which'll be overwritten by
+        * the next call to getpwuid(), so it'd be unsafe to return
+        * p->pw_name without copying. */
+       return strdup(p->pw_name);
+    } else {
+       return 0;
+    }
+}
+
+char *
+uid_homedir(uid_t uid)
+{
+    struct passwd *p = getpwuid(uid);
+    if(p) {
+       /* Let's be careful about this, shall we? */
+       size_t len = strlen(p->pw_dir);
+       if (p->pw_dir[len-1] == '/') {
+           return strdup(p->pw_dir);
+       } else {
+           char *result = malloc(len + 2);
+           if (result) {
+               int nchars = sprintf(result,"%s/",p->pw_dir);
+               if (nchars == len + 1) {
+                   return result;
+               } else {
+                   return 0;
+               }
+           } else {
+               return 0;
+           }
+       }
+    } else {
+       return 0;
+    }
+}
+\f
+/*
+ * functions to get miscellaneous C-level variables
+ *
+ * (Doing this by calling functions lets us borrow the smarts of the C
+ * linker, so that things don't blow up when libc versions and thus
+ * variable locations change between compile time and run time.)
+ */
+
+char **
+wrapped_environ()
+{
+    return environ;
+}