libbb: rename execable -> executable. No code changes
English speakers complained that it sounded awfully broken.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/libbb/executable.c b/libbb/executable.c
new file mode 100644
index 0000000..85ecc3e
--- /dev/null
+++ b/libbb/executable.c
@@ -0,0 +1,92 @@
+/* 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 source tree.
+ */
+
+#include "libbb.h"
+
+/* check if path points to an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int FAST_FUNC file_is_executable(const char *name)
+{
+ struct stat s;
+ return (!access(name, X_OK) && !stat(name, &s) && S_ISREG(s.st_mode));
+}
+
+/* search (*PATHp) for an executable file;
+ * return allocated string containing full path if found;
+ * PATHp points to the component after the one where it was found
+ * (or NULL),
+ * you may call find_executable again with this PATHp to continue
+ * (if it's not NULL).
+ * return NULL otherwise; (PATHp is undefined)
+ * in all cases (*PATHp) contents will be trashed (s/:/NUL/).
+ */
+char* FAST_FUNC find_executable(const char *filename, char **PATHp)
+{
+ /* About empty components in $PATH:
+ * http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html
+ * 8.3 Other Environment Variables - PATH
+ * A zero-length prefix is a legacy feature that indicates the current
+ * working directory. It appears as two adjacent colons ( "::" ), as an
+ * initial colon preceding the rest of the list, or as a trailing colon
+ * following the rest of the list.
+ */
+ char *p, *n;
+
+ p = *PATHp;
+ while (p) {
+ n = strchr(p, ':');
+ if (n)
+ *n++ = '\0';
+ p = concat_path_file(
+ p[0] ? p : ".", /* handle "::" case */
+ filename
+ );
+ if (file_is_executable(p)) {
+ *PATHp = n;
+ return p;
+ }
+ free(p);
+ p = n;
+ } /* on loop exit p == NULL */
+ return p;
+}
+
+/* search $PATH for an executable file;
+ * return 1 if found;
+ * return 0 otherwise;
+ */
+int FAST_FUNC executable_exists(const char *filename)
+{
+ char *path = xstrdup(getenv("PATH"));
+ char *tmp = path;
+ char *ret = find_executable(filename, &tmp);
+ free(path);
+ free(ret);
+ return ret != NULL;
+}
+
+#if ENABLE_FEATURE_PREFER_APPLETS
+/* just like the real execvp, but try to launch an applet named 'file' first */
+int FAST_FUNC BB_EXECVP(const char *file, char *const argv[])
+{
+ if (find_applet_by_name(file) >= 0)
+ execvp(bb_busybox_exec_path, argv);
+ return execvp(file, argv);
+}
+#endif
+
+int FAST_FUNC BB_EXECVP_or_die(char **argv)
+{
+ BB_EXECVP(argv[0], argv);
+ /* SUSv3-mandated exit codes */
+ xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
+ bb_perror_msg_and_die("can't execute '%s'", argv[0]);
+}