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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