getconf: Support path variables

1 files changed, 56 insertions, 1 deletions

diff --git a/getconf/getconf.c b/getconf/getconf.c
index 8ede268..01265f1 100644
--- a/getconf/getconf.c
+++ b/getconf/getconf.c
@@ -393,6 +393,27 @@ const var_map_t limit_vars[] = {
 const int limit_count = sizeof(limit_vars) / sizeof(limit_vars[0]);
 
 
+const var_map_t path_vars[] = {
+	{ "FILESIZEBITS", _PC_FILESIZEBITS },
+	{ "LINK_MAX", _PC_LINK_MAX },
+	{ "MAX_CANON", _PC_MAX_CANON },
+	{ "MAX_INPUT", _PC_MAX_INPUT },
+	{ "NAME_MAX", _PC_NAME_MAX },
+	{ "PATH_MAX", _PC_PATH_MAX },
+	{ "PIPE_BUF", _PC_PIPE_BUF },
+	{ "POSIX2_SYMLINKS", _PC_2_SYMLINKS },
+	{ "POSIX_ALLOC_SIZE_MIN", _PC_ALLOC_SIZE_MIN },
+	{ "POSIX_REC_INCR_XFER_SIZE", _PC_REC_INCR_XFER_SIZE },
+	{ "POSIX_REC_MAX_XFER_SIZE", _PC_REC_MAX_XFER_SIZE },
+	{ "POSIX_REC_MIN_XFER_SIZE", _PC_REC_MIN_XFER_SIZE },
+	{ "POSIX_REC_XFER_ALIGN", _PC_REC_XFER_ALIGN },
+	{ "SYMLINK_MAX", _PC_SYMLINK_MAX }
+};
+
+
+const int path_count = sizeof(path_vars) / sizeof (path_vars[0]);
+
+
 int do_system_var(char *environment, char *system_var)
 {
 	int var;
@@ -499,7 +520,41 @@ int do_system_var(char *environment, char *system_var)
 
 int do_path_var(char *environment, char *path_var, char *pathname)
 {
-	return -1;
+	int var;
+
+	for(var = 0; var < path_count; var++)
+	{
+		long int result;
+
+		if(strcasecmp(path_vars[var].variable, path_var) != 0)
+		{
+			continue;
+		}
+
+		if(path_vars[var].value == _UNDEFINED_VARIABLE_)
+		{
+			printf("undefined\n");
+			return 0;
+		}
+
+		errno = 0;
+
+		result = pathconf(pathname, path_vars[var].value);
+		if(errno != 0)
+		{
+		/* We know that this is a valid symbol, so don't break
+		 * expectations.
+		 */
+			printf("undefined\n");
+			return 0;
+		}
+
+		printf("%ld\n", result);
+		return 0;
+	}
+
+	fprintf(stderr, "%s: not a recognised system variable\n", path_var);
+	return EINVAL;
 }