1 files changed, 78 insertions, 0 deletions
diff --git a/libbb/compare_string_array.c b/libbb/compare_string_array.c
new file mode 100644
index 0000000..43c59e8
--- /dev/null
+++ b/libbb/compare_string_array.c
@@ -0,0 +1,78 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#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 len = strlen(key);
+
+	if (len) {
+		int idx = 0;
+		while (*strings) {
+			if (strncmp(strings, key, len) == 0) {
+				return idx;
+			}
+			strings += strlen(strings) + 1; /* skip NUL */
+			idx++;
+		}
+	}
+	return -1;
+}
+
+const char* FAST_FUNC nth_string(const char *strings, int n)
+{
+	while (n) {
+		n--;
+		strings += strlen(strings) + 1;
+	}
+	return strings;
+}