execable.c: forgot to do "svn add" again...

git-svn-id: svn://busybox.net/trunk/busybox@16369 69ca8d6d-28ef-0310-b511-8ec308f3f277

1 files changed, 62 insertions, 0 deletions

diff --git a/libbb/execable.c b/libbb/execable.c
new file mode 100644
index 000000000..cb56b9181
--- /dev/null
+++ b/libbb/execable.c
@@ -0,0 +1,62 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* check if path points to an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int execable_file(const char *name)
+{
+        struct stat s;
+        return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
+}
+
+/* search $PATH for an executable file;
+ * return allocated string containing full path if found;
+ * return NULL otherwise;
+ */
+char *find_execable(const char *filename)
+{
+        char *path, *p, *n;
+
+        p = path = xstrdup(getenv("PATH") ? : "");
+        while (p) {
+                n = strchr(p, ':');
+                if (n)
+                        *n++ = '\0';
+                if (*p != '\0') { /* it's not a PATH="foo::bar" situation */
+                        p = concat_path_file(p, filename);
+                        if (execable_file(p)) {
+                                free(path);
+                                return p;
+                        }
+                        free(p);
+                }
+                p = n;
+        }
+        free(path);
+        return NULL;
+}
+
+/* search $PATH for an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int exists_execable(const char *filename)
+{
+        char *ret = find_execable(filename);
+        if (ret) {
+                free(ret);
+                return 1;
+        }
+        return 0;
+}
+