Add gpr_ltoa

2 files changed, 37 insertions, 0 deletions

diff --git a/include/grpc/support/string.h b/include/grpc/support/string.h
index 68e7452a7f..2ce19036f2 100644
--- a/include/grpc/support/string.h
+++ b/include/grpc/support/string.h
@@ -60,6 +60,13 @@ char *gpr_hexdump(const char *buf, size_t len, gpr_uint32 flags);
 int gpr_parse_bytes_to_uint32(const char *data, size_t length,
                               gpr_uint32 *result);
 
+/* Convert a long to a string in base 10; returns the length of the
+   output string (or 0 on failure) */
+int gpr_ltoa(long value, char *output);
+
+/* Reverse a run of bytes */
+void gpr_reverse_bytes(char *str, int len);
+
 /* printf to a newly-allocated string.  The set of supported formats may vary
    between platforms.
 
diff --git a/src/core/support/string.c b/src/core/support/string.c
index 7960547735..7e84437fac 100644
--- a/src/core/support/string.c
+++ b/src/core/support/string.c
@@ -122,3 +122,33 @@ int gpr_parse_bytes_to_uint32(const char *buf, size_t len, gpr_uint32 *result) {
   *result = out;
   return 1;
 }
+
+void gpr_reverse_bytes(char *str, int len) {
+  char *p1, *p2;
+  for (p1 = str, p2 = str + len - 1; p2 > p1; ++p1, --p2) {
+    char temp = *p1;
+    *p1 = *p2;
+    *p2 = temp;
+  }
+}
+
+int gpr_ltoa(long 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++] = '0' + value % 10;
+    value /= 10;
+  }
+  if (neg) string[i++] = '-';
+  gpr_reverse_bytes(string, i);
+  string[i] = 0;
+  return i;
+}