1 files changed, 124 insertions, 0 deletions
diff --git a/src/core/support/string.c b/src/core/support/string.c
new file mode 100644
index 0000000000..b1f0795846
--- /dev/null
+++ b/src/core/support/string.c
@@ -0,0 +1,124 @@
+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/string.h>
+
+#include <ctype.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/useful.h>
+
+char *gpr_strdup(const char *src) {
+  char *dst;
+  size_t len;
+
+  if (!src) {
+    return NULL;
+  }
+
+  len = strlen(src) + 1;
+  dst = gpr_malloc(len);
+
+  memcpy(dst, src, len);
+
+  return dst;
+}
+
+typedef struct {
+  size_t capacity;
+  size_t length;
+  char *data;
+} hexout;
+
+static hexout hexout_create() {
+  hexout r = {0, 0, NULL};
+  return r;
+}
+
+static void hexout_append(hexout *out, char c) {
+  if (out->length == out->capacity) {
+    out->capacity = GPR_MAX(8, 2 * out->capacity);
+    out->data = gpr_realloc(out->data, out->capacity);
+  }
+  out->data[out->length++] = c;
+}
+
+char *gpr_hexdump(const char *buf, size_t len, gpr_uint32 flags) {
+  static const char hex[16] = "0123456789abcdef";
+  hexout out = hexout_create();
+
+  const gpr_uint8 *const beg = (const gpr_uint8 *)buf;
+  const gpr_uint8 *const end = beg + len;
+  const gpr_uint8 *cur;
+
+  for (cur = beg; cur != end; ++cur) {
+    if (cur != beg) hexout_append(&out, ' ');
+    hexout_append(&out, hex[*cur >> 4]);
+    hexout_append(&out, hex[*cur & 0xf]);
+  }
+
+  if (flags & GPR_HEXDUMP_PLAINTEXT) {
+    cur = beg;
+    if (len) hexout_append(&out, ' ');
+    hexout_append(&out, '\'');
+    for (cur = beg; cur != end; ++cur) {
+      hexout_append(&out, isprint(*cur) ? *cur : '.');
+    }
+    hexout_append(&out, '\'');
+  }
+
+  hexout_append(&out, 0);
+
+  return out.data;
+}
+
+int gpr_parse_bytes_to_uint32(const char *buf, size_t len, gpr_uint32 *result) {
+  gpr_uint32 out = 0;
+  gpr_uint32 new;
+  size_t i;
+
+  if (len == 0) return 0; /* must have some bytes */
+
+  for (i = 0; i < len; i++) {
+    if (buf[i] < '0' || buf[i] > '9') return 0; /* bad char */
+    new = 10 * out + (buf[i] - '0');
+    if (new < out) return 0; /* overflow */
+    out = new;
+  }
+
+  *result = out;
+  return 1;
+}