feat: add cli_parse_ufloat for non-negative float parsing

include/cli_parse_utils.h

@@ -6,5 +6,6 @@
 int	cli_parse_uint64(const char *s, uint64_t *out);
 int	cli_parse_int64(const char *s, int64_t *out);
 int	cli_parse_float(const char *s, float *out);
+int	cli_parse_ufloat(const char *s, float *out);
 
 #endif

src/Makefile.am

@@ -5,7 +5,8 @@ libcli_la_SOURCES = \
 	help.c \
 	parse_utils/parse_uint.c \
 	parse_utils/parse_int.c \
-	parse_utils/parse_float.c
+	parse_utils/parse_float.c \
+	parse_utils/parse_ufloat.c
 
 libcli_la_CPPFLAGS	= -I$(top_srcdir)/include
 libcli_la_CFLAGS	= -std=c99 -Wall -Wextra

src/parse_utils/parse_ufloat.c

@@ -0,0 +1,21 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <math.h>
+
+int
+cli_parse_ufloat(const char *s, float *out)
+{
+	char *end;
+
+	if (NULL == s || '\0' == *s)
+		return 1;
+
+	errno = 0;
+	float v = strtof(s, &end);
+
+	if (s == end || ERANGE == errno || '\0' != *end || 0 == isfinite(v) || v < 0.0f)
+		return 1;
+
+	*out = v;
+	return 0;
+}