1 files changed, 85 insertions, 0 deletions
diff --git a/libbb/bb_strtod.c b/libbb/bb_strtod.c
new file mode 100644
index 000000000..0515ff867
--- /dev/null
+++ b/libbb/bb_strtod.c
@@ -0,0 +1,85 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include <math.h>  /* just for HUGE_VAL */
+
+#define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9)
+
+double FAST_FUNC bb_strtod(const char *arg, char **endp)
+{
+	double v;
+	char *endptr;
+
+	if (arg[0] != '-' && NOT_DIGIT(arg[0]))
+		goto err;
+	errno = 0;
+	v = strtod(arg, &endptr);
+	if (endp)
+		*endp = endptr;
+	if (endptr[0]) {
+		/* "1234abcg" or out-of-range? */
+		if (isalnum(endptr[0]) || errno) {
+ err:
+			errno = ERANGE;
+			return HUGE_VAL;
+		}
+		/* good number, just suspicious terminator */
+		errno = EINVAL;
+	}
+	return v;
+}
+
+#if 0
+/* String to timespec: "NNNN[.NNNNN]" -> struct timespec.
+ * Can be used for other fixed-point needs.
+ * Returns pointer past last converted char,
+ * and returns errno similar to bb_strtoXX functions.
+ */
+char* FAST_FUNC bb_str_to_ts(struct timespec *ts, const char *arg)
+{
+	if (sizeof(ts->tv_sec) <= sizeof(int))
+		ts->tv_sec = bb_strtou(arg, &arg, 10);
+	else if (sizeof(ts->tv_sec) <= sizeof(long))
+		ts->tv_sec = bb_strtoul(arg, &arg, 10);
+	else
+		ts->tv_sec = bb_strtoull(arg, &arg, 10);
+	ts->tv_nsec = 0;
+
+	if (*arg != '.')
+		return arg;
+
+	/* !EINVAL: number is not ok (alphanumeric ending, overflow etc) */
+	if (errno != EINVAL)
+		return arg;
+
+	if (!*++arg) /* "NNN." */
+		return arg;
+
+	{ /* "NNN.xxx" - parse xxx */
+		int ndigits;
+		char *p;
+		char buf[10]; /* we never use more than 9 digits */
+
+		/* Need to make a copy to avoid false overflow */
+		safe_strncpy(buf, arg, 10);
+		ts->tv_nsec = bb_strtou(buf, &p, 10);
+		ndigits = p - buf;
+		arg += ndigits;
+		/* normalize to nsec */
+		while (ndigits < 9) {
+			ndigits++;
+			ts->tv_nsec *= 10;
+		}
+		while (isdigit(*arg)) /* skip possible 10th plus digits */
+			arg++;
+	}
+	return arg;
+}
+#endif