drivers: Fix locale dependent string to float conversion

[libsigrok.git] / src / strutil.c

diff --git a/src/strutil.c b/src/strutil.c
index 5f0deb7708f374327b6c5d33e7649ca3da342948..30e992b815468e5a86c1210652b3a19aece2720b 100644 (file)
--- a/src/strutil.c
+++ b/src/strutil.c
@@ -169,6 +169,38 @@ SR_PRIV int sr_atof(const char *str, float *ret)
        return SR_OK;
 }
 
+/**
+ * @private
+ *
+ * Convert a string representation of a numeric value to a double. The
+ * conversion is strict and will fail if the complete string does not represent
+ * a valid double. The function sets errno according to the details of the
+ * failure. This version ignores the locale.
+ *
+ * @param str The string representation to convert.
+ * @param ret Pointer to double where the result of the conversion will be stored.
+ *
+ * @retval SR_OK Conversion successful.
+ * @retval SR_ERR Failure.
+ */
+SR_PRIV int sr_atod_ascii(const char *str, double *ret)
+{
+       double tmp;
+       char *endptr = NULL;
+
+       errno = 0;
+       tmp = g_ascii_strtod(str, &endptr);
+
+       if (!endptr || *endptr || errno) {
+               if (!errno)
+                       errno = EINVAL;
+               return SR_ERR;
+       }
+
+       *ret = tmp;
+       return SR_OK;
+}
+
 /**
  * @private
  *