--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_GPR_STRING_H
+#define GRPC_CORE_LIB_GPR_STRING_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/impl/codegen/gpr_types.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+
+/* String utility functions */
+
+/* Flags for gpr_dump function. */
+#define GPR_DUMP_HEX 0x00000001
+#define GPR_DUMP_ASCII 0x00000002
+
+/* Converts array buf, of length len, into a C string according to the flags.
+ Result should be freed with gpr_free() */
+char* gpr_dump(const char* buf, size_t len, uint32_t flags);
+/* Converts array buf, of length len, into a C string according to the flags.
+ The length of the returned buffer is stored in out_len.
+ Result should be freed with gpr_free() */
+char* gpr_dump_return_len(const char* buf, size_t len, uint32_t flags,
+ size_t* out_len);
+
+/* Parses an array of bytes into an integer (base 10). Returns 1 on success,
+ 0 on failure. */
+int gpr_parse_bytes_to_uint32(const char* data, size_t length,
+ uint32_t* result);
+
+/* Minimum buffer size for calling ltoa */
+#define GPR_LTOA_MIN_BUFSIZE (3 * sizeof(long))
+
+/* Convert a long to a string in base 10; returns the length of the
+ output string (or 0 on failure).
+ 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(int64_t))
+
+/* 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 int64_ttoa(int64_t value, char* output);
+
+// Parses a non-negative number from a value string. Returns -1 on error.
+int gpr_parse_nonnegative_int(const char* value);
+
+/* Reverse a run of bytes */
+void gpr_reverse_bytes(char* str, int len);
+
+/* Pad a string with flag characters. The given length specifies the minimum
+ field width. The input string is never truncated. */
+char* gpr_leftpad(const char* str, char flag, size_t length);
+
+/* Join a set of strings, returning the resulting string.
+ Total combined length (excluding null terminator) is returned in total_length
+ if it is non-null. */
+char* gpr_strjoin(const char** strs, size_t nstrs, size_t* total_length);
+
+/* Join a set of strings using a separator, returning the resulting string.
+ Total combined length (excluding null terminator) is returned in total_length
+ if it is non-null. */
+char* gpr_strjoin_sep(const char** strs, size_t nstrs, const char* sep,
+ size_t* total_length);
+
+void gpr_string_split(const char* input, const char* sep, char*** strs,
+ size_t* nstrs);
+
+/* Returns an allocated string that represents tm according to RFC-3339, and,
+ more specifically, follows:
+ https://developers.google.com/protocol-buffers/docs/proto3#json
+
+ Uses RFC 3339, where generated output will always be Z-normalized and uses
+ 0, 3, 6 or 9 fractional digits. */
+char* gpr_format_timespec(gpr_timespec);
+
+/* A vector of strings... for building up a final string one piece at a time */
+typedef struct {
+ char** strs;
+ size_t count;
+ size_t capacity;
+} gpr_strvec;
+
+/* Initialize/destroy */
+void gpr_strvec_init(gpr_strvec* strs);
+void gpr_strvec_destroy(gpr_strvec* strs);
+/* Add a string to a strvec, takes ownership of the string */
+void gpr_strvec_add(gpr_strvec* strs, char* add);
+/* Return a joined string with all added substrings, optionally setting
+ total_length as per gpr_strjoin */
+char* gpr_strvec_flatten(gpr_strvec* strs, size_t* total_length);
+
+/** Case insensitive string comparison... return <0 if lower(a)<lower(b), ==0 if
+ lower(a)==lower(b), >0 if lower(a)>lower(b) */
+int gpr_stricmp(const char* a, const char* b);
+int gpr_strincmp(const char* a, const char* b, size_t n);
+
+void* gpr_memrchr(const void* s, int c, size_t n);
+
+/* Try to parse given string into a boolean value.
+ When parsed successfully, dst will have the value and returns true.
+ Otherwise, it returns false. */
+bool gpr_parse_bool_value(const char* value, bool* dst);
+
+#endif /* GRPC_CORE_LIB_GPR_STRING_H */
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