1 //
2 //
3 // Copyright 2015 gRPC authors.
4 //
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
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
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.
16 //
17 //
18
19 // Windows code for gpr snprintf support.
20
21 #include <grpc/support/port_platform.h>
22
23 #ifdef GPR_WINDOWS_STRING
24
25 #include <stdarg.h>
26 #include <stdio.h>
27 #include <string.h>
28
29 #include <grpc/support/alloc.h>
30 #include <grpc/support/string_util.h>
31
32 #include "src/core/lib/gpr/string.h"
33
gpr_asprintf(char ** strp,const char * format,...)34 int gpr_asprintf(char** strp, const char* format, ...) {
35 va_list args;
36 int ret;
37 size_t strp_buflen;
38
39 // Determine the length.
40 va_start(args, format);
41 ret = _vscprintf(format, args);
42 va_end(args);
43 if (ret < 0) {
44 *strp = NULL;
45 return -1;
46 }
47
48 // Allocate a new buffer, with space for the NUL terminator.
49 strp_buflen = (size_t)ret + 1;
50 if ((*strp = (char*)gpr_malloc(strp_buflen)) == NULL) {
51 // This shouldn't happen, because gpr_malloc() calls abort().
52 return -1;
53 }
54
55 // Print to the buffer.
56 va_start(args, format);
57 ret = vsnprintf_s(*strp, strp_buflen, _TRUNCATE, format, args);
58 va_end(args);
59 if ((size_t)ret == strp_buflen - 1) {
60 return ret;
61 }
62
63 // This should never happen.
64 gpr_free(*strp);
65 *strp = NULL;
66 return -1;
67 }
68
69 #endif // GPR_WINDOWS_STRING
70