zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/app/busybox/src/libbb/compare_string_array.c b/ap/app/busybox/src/libbb/compare_string_array.c
new file mode 100644
index 0000000..4b10cc1
--- /dev/null
+++ b/ap/app/busybox/src/libbb/compare_string_array.c
@@ -0,0 +1,95 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+#include "libbb.h"
+
+/* returns the array index of the string */
+/* (index of first match is returned, or -1) */
+int FAST_FUNC index_in_str_array(const char *const string_array[], const char *key)
+{
+ int i;
+
+ for (i = 0; string_array[i] != 0; i++) {
+ if (strcmp(string_array[i], key) == 0) {
+ return i;
+ }
+ }
+ return -1;
+}
+
+int FAST_FUNC index_in_strings(const char *strings, const char *key)
+{
+ int idx = 0;
+
+ while (*strings) {
+ if (strcmp(strings, key) == 0) {
+ return idx;
+ }
+ strings += strlen(strings) + 1; /* skip NUL */
+ idx++;
+ }
+ return -1;
+}
+
+/* returns the array index of the string, even if it matches only a beginning */
+/* (index of first match is returned, or -1) */
+#ifdef UNUSED
+int FAST_FUNC index_in_substr_array(const char *const string_array[], const char *key)
+{
+ int i;
+ int len = strlen(key);
+ if (len) {
+ for (i = 0; string_array[i] != 0; i++) {
+ if (strncmp(string_array[i], key, len) == 0) {
+ return i;
+ }
+ }
+ }
+ return -1;
+}
+#endif
+
+int FAST_FUNC index_in_substrings(const char *strings, const char *key)
+{
+ int matched_idx = -1;
+ const int len = strlen(key);
+
+ if (len) {
+ int idx = 0;
+ while (*strings) {
+ if (strncmp(strings, key, len) == 0) {
+ if (strings[len] == '\0')
+ return idx; /* exact match */
+ if (matched_idx >= 0)
+ return -1; /* ambiguous match */
+ matched_idx = idx;
+ }
+ strings += strlen(strings) + 1; /* skip NUL */
+ idx++;
+ }
+ }
+ return matched_idx;
+}
+
+const char* FAST_FUNC nth_string(const char *strings, int n)
+{
+ while (n) {
+ n--;
+ strings += strlen(strings) + 1;
+ }
+ return strings;
+}
+
+#ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
+/* Returns 0 for no, 1 for yes or a negative value on error. */
+smallint FAST_FUNC yesno(const char *str)
+{
+ static const char no_yes[] ALIGN1 =
+ "0\0" "off\0" "no\0"
+ "1\0" "on\0" "yes\0";
+ int ret = index_in_substrings(no_yes, str);
+ return ret / 3;
+}
+#endif