examples: warn on invalid numeric parameters
add ExUtilGet[U]Int / ExUtilGetFloat which print an error message on
parse failure.
fixes issue #219.
(cherry picked from commit 96d43a873a61886e0642ec50f25cadccc21a5086)
Conflicts:
examples/cwebp.c
examples/dwebp.c
Change-Id: Ie537f5aebd138925bf1a48289b6b5e261b3af2ca
diff --git a/examples/example_util.c b/examples/example_util.c
index 5e34f30..f64cfd8 100644
--- a/examples/example_util.c
+++ b/examples/example_util.c
@@ -23,6 +23,35 @@
#include "webp/decode.h"
#include "./stopwatch.h"
+//------------------------------------------------------------------------------
+// String parsing
+
+uint32_t ExUtilGetUInt(const char* const v, int base, int* const error) {
+ char* end = NULL;
+ const uint32_t n = (v != NULL) ? (uint32_t)strtoul(v, &end, base) : 0u;
+ if (end == v && error != NULL && !*error) {
+ *error = 1;
+ fprintf(stderr, "Error! '%s' is not an integer.\n",
+ (v != NULL) ? v : "(null)");
+ }
+ return n;
+}
+
+int ExUtilGetInt(const char* const v, int base, int* const error) {
+ return (int)ExUtilGetUInt(v, base, error);
+}
+
+float ExUtilGetFloat(const char* const v, int* const error) {
+ char* end = NULL;
+ const float f = (v != NULL) ? (float)strtod(v, &end) : 0.f;
+ if (end == v && error != NULL && !*error) {
+ *error = 1;
+ fprintf(stderr, "Error! '%s' is not a floating point number.\n",
+ (v != NULL) ? v : "(null)");
+ }
+ return f;
+}
+
// -----------------------------------------------------------------------------
// File I/O