From e76409232ce6a027bd3f06da79616830d3da9980 Mon Sep 17 00:00:00 2001
From: Aki Tuomi <aki.tuomi@dovecot.fi>
Date: Fri, 29 Jan 2016 10:28:53 +0200
Subject: [PATCH] lib: Add str_is_float check function

---
 src/lib/strnum.c | 26 ++++++++++++++++++++++++++
 src/lib/strnum.h |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/src/lib/strnum.c b/src/lib/strnum.c
index f8301ea497..72e155fa18 100644
--- a/src/lib/strnum.c
+++ b/src/lib/strnum.c
@@ -17,6 +17,32 @@ bool str_is_numeric(const char *str, char end_char)
 	return TRUE;
 }
 
+bool str_is_float(const char *str, char end_char)
+{
+	bool dot_seen = FALSE;
+	bool num_seen = FALSE;
+
+	if (*str == '\0' || *str == end_char)
+		return FALSE;
+
+	while (*str != '\0' && *str != end_char) {
+		if (*str == '.') {
+			if (dot_seen || !num_seen) return FALSE;
+			dot_seen = TRUE;
+			num_seen = FALSE;
+			str++;
+			/* enforce that number follows dot */
+			continue;
+		}
+		if (*str < '0' || *str > '9')
+			return FALSE;
+		num_seen = TRUE;
+		str++;
+	}
+
+	return num_seen;
+}
+
 /* 
  * Unsigned decimal
  */
diff --git a/src/lib/strnum.h b/src/lib/strnum.h
index 58de24fdd4..471d4aa365 100644
--- a/src/lib/strnum.h
+++ b/src/lib/strnum.h
@@ -180,6 +180,10 @@ int str_to_time(const char *str, time_t *num_r)
    Stop when `end_char' is found from string. */
 bool str_is_numeric(const char *str, char end_char) ATTR_PURE;
 
+/* Return TRUE when string has one or more numbers, followed
+   with zero or one dot, followed with at least one number. */
+bool str_is_float(const char *str, char end_char) ATTR_PURE;
+
 /* Returns human readable string about what is wrong with the string.
    This function assumes that str_to_*() had already returned -1 for the
    string. */