make grpc compile on win64bit

2 files changed, 31 insertions, 0 deletions

diff --git a/src/core/support/string.c b/src/core/support/string.c
index e0ffeb8a4a..fad0b4008b 100644
--- a/src/core/support/string.c
+++ b/src/core/support/string.c
@@ -173,6 +173,27 @@ int gpr_ltoa(long value, char *string) {
   return i;
 }
 
+int gpr_int64toa(gpr_int64 value, char *string) {
+  int i = 0;
+  int neg = value < 0;
+
+  if (value == 0) {
+    string[0] = '0';
+    string[1] = 0;
+    return 1;
+  }
+
+  if (neg) value = -value;
+  while (value) {
+    string[i++] = (char)('0' + value % 10);
+    value /= 10;
+  }
+  if (neg) string[i++] = '-';
+  gpr_reverse_bytes(string, i);
+  string[i] = 0;
+  return i;
+}
+
 char *gpr_strjoin(const char **strs, size_t nstrs, size_t *final_length) {
   return gpr_strjoin_sep(strs, nstrs, "", final_length);
 }
diff --git a/src/core/support/string.h b/src/core/support/string.h
index a28e00fd3e..9b604ac5bf 100644
--- a/src/core/support/string.h
+++ b/src/core/support/string.h
@@ -70,6 +70,16 @@ int gpr_parse_bytes_to_uint32(const char *data, size_t length,
    output must be at least GPR_LTOA_MIN_BUFSIZE bytes long. */
 int gpr_ltoa(long value, char *output);
 
+/* Minimum buffer size for calling int64toa */
+#define GPR_INT64TOA_MIN_BUFSIZE (3 * sizeof(gpr_int64))
+
+/* Convert an int64 to a string in base 10; returns the length of the
+output string (or 0 on failure).
+output must be at least GPR_INT64TOA_MIN_BUFSIZE bytes long.
+NOTE: This function ensures sufficient bit width even on Win x64,
+where long is 32bit is size.*/
+int gpr_int64toa(gpr_int64 value, char *output);
+
 /* Reverse a run of bytes */
 void gpr_reverse_bytes(char *str, int len);