[PATCH v17 01/14] util/cutils: Add Add qemu_strtold and qemu_strtold_finite

[Tao Xu <tao3.xu@intel.com>]

Work like qemu_strtod() and qemu_strtold_finite, except store long
double.

Signed-off-by: Tao Xu <tao3.xu@intel.com>
---

No changes in v17.
---
 include/qemu/cutils.h |  3 +++
 util/cutils.c         | 48 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/include/qemu/cutils.h b/include/qemu/cutils.h
index b54c847e0f..48cf9bf776 100644
--- a/include/qemu/cutils.h
+++ b/include/qemu/cutils.h
@@ -146,6 +146,9 @@ int qemu_strtou64(const char *nptr, const char **endptr, int base,
                   uint64_t *result);
 int qemu_strtod(const char *nptr, const char **endptr, double *result);
 int qemu_strtod_finite(const char *nptr, const char **endptr, double *result);
+int qemu_strtold(const char *nptr, const char **endptr, long double *result);
+int qemu_strtold_finite(const char *nptr, const char **endptr,
+                        long double *result);
 
 int parse_uint(const char *s, unsigned long long *value, char **endptr,
                int base);
diff --git a/util/cutils.c b/util/cutils.c
index fd591cadf0..5db3b2add5 100644
--- a/util/cutils.c
+++ b/util/cutils.c
@@ -553,7 +553,7 @@ int qemu_strtou64(const char *nptr, const char **endptr, int base,
 
 /**
  * Convert string @nptr to a double.
-  *
+ *
  * This is a wrapper around strtod() that is harder to misuse.
  * Semantics of @nptr and @endptr match strtod() with differences
  * noted below.
@@ -616,6 +616,52 @@ int qemu_strtod_finite(const char *nptr, const char **endptr, double *result)
     return ret;
 }
 
+/*
+ * Convert string @nptr to a long double.
+ *
+ * Works like qemu_strtod(), except it stores long double.
+ */
+int qemu_strtold(const char *nptr, const char **endptr, long double *result)
+{
+    char *ep;
+
+    if (!nptr) {
+        if (endptr) {
+            *endptr = nptr;
+        }
+        return -EINVAL;
+    }
+
+    errno = 0;
+    *result = strtold(nptr, &ep);
+    return check_strtox_error(nptr, ep, endptr, errno);
+}
+
+/*
+ * Convert string @nptr to a finite long double.
+ *
+ * Works like qemu_strtod_finite(), except it stores long double.
+ */
+int qemu_strtold_finite(const char *nptr, const char **endptr,
+                        long double *result)
+{
+    long double tmp;
+    int ret;
+
+    ret = qemu_strtold(nptr, endptr, &tmp);
+    if (!ret && !isfinite(tmp)) {
+        if (endptr) {
+            *endptr = nptr;
+        }
+        ret = -EINVAL;
+    }
+
+    if (ret != -EINVAL) {
+        *result = tmp;
+    }
+    return ret;
+}
+
 /**
  * Searches for the first occurrence of 'c' in 's', and returns a pointer
  * to the trailing null byte if none was found.
-- 
2.20.1