3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #ifndef GRPC_CORE_LIB_GPR_STRING_H
20 #define GRPC_CORE_LIB_GPR_STRING_H
22 #include <grpc/support/port_platform.h>
24 #include <grpc/impl/codegen/gpr_types.h>
29 /* String utility functions */
31 /* Flags for gpr_dump function. */
32 #define GPR_DUMP_HEX 0x00000001
33 #define GPR_DUMP_ASCII 0x00000002
35 /* Converts array buf, of length len, into a C string according to the flags.
36 Result should be freed with gpr_free() */
37 char* gpr_dump(const char* buf, size_t len, uint32_t flags);
39 /* Parses an array of bytes into an integer (base 10). Returns 1 on success,
41 int gpr_parse_bytes_to_uint32(const char* data, size_t length,
44 /* Minimum buffer size for calling ltoa */
45 #define GPR_LTOA_MIN_BUFSIZE (3 * sizeof(long))
47 /* Convert a long to a string in base 10; returns the length of the
48 output string (or 0 on failure).
49 output must be at least GPR_LTOA_MIN_BUFSIZE bytes long. */
50 int gpr_ltoa(long value, char* output);
52 /* Minimum buffer size for calling int64toa */
53 #define GPR_INT64TOA_MIN_BUFSIZE (3 * sizeof(int64_t))
55 /* Convert an int64 to a string in base 10; returns the length of the
56 output string (or 0 on failure).
57 output must be at least GPR_INT64TOA_MIN_BUFSIZE bytes long.
58 NOTE: This function ensures sufficient bit width even on Win x64,
59 where long is 32bit is size.*/
60 int int64_ttoa(int64_t value, char* output);
62 // Parses a non-negative number from a value string. Returns -1 on error.
63 int gpr_parse_nonnegative_int(const char* value);
65 /* Reverse a run of bytes */
66 void gpr_reverse_bytes(char* str, int len);
68 /* Pad a string with flag characters. The given length specifies the minimum
69 field width. The input string is never truncated. */
70 char* gpr_leftpad(const char* str, char flag, size_t length);
72 /* Join a set of strings, returning the resulting string.
73 Total combined length (excluding null terminator) is returned in total_length
75 char* gpr_strjoin(const char** strs, size_t nstrs, size_t* total_length);
77 /* Join a set of strings using a separator, returning the resulting string.
78 Total combined length (excluding null terminator) is returned in total_length
80 char* gpr_strjoin_sep(const char** strs, size_t nstrs, const char* sep,
81 size_t* total_length);
83 void gpr_string_split(const char* input, const char* sep, char*** strs,
86 /* Returns an allocated string that represents tm according to RFC-3339, and,
87 more specifically, follows:
88 https://developers.google.com/protocol-buffers/docs/proto3#json
90 Uses RFC 3339, where generated output will always be Z-normalized and uses
91 0, 3, 6 or 9 fractional digits. */
92 char* gpr_format_timespec(gpr_timespec);
94 /* A vector of strings... for building up a final string one piece at a time */
101 /* Initialize/destroy */
102 void gpr_strvec_init(gpr_strvec* strs);
103 void gpr_strvec_destroy(gpr_strvec* strs);
104 /* Add a string to a strvec, takes ownership of the string */
105 void gpr_strvec_add(gpr_strvec* strs, char* add);
106 /* Return a joined string with all added substrings, optionally setting
107 total_length as per gpr_strjoin */
108 char* gpr_strvec_flatten(gpr_strvec* strs, size_t* total_length);
110 /** Case insensitive string comparison... return <0 if lower(a)<lower(b), ==0 if
111 lower(a)==lower(b), >0 if lower(a)>lower(b) */
112 int gpr_stricmp(const char* a, const char* b);
114 void* gpr_memrchr(const void* s, int c, size_t n);
116 /** Return true if lower(s) equals "true", "yes" or "1", otherwise false. */
117 bool gpr_is_true(const char* s);
119 #endif /* GRPC_CORE_LIB_GPR_STRING_H */