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// // // 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. // // #include <grpc/support/port_platform.h> #ifdef GPR_POSIX_STRING #include <grpc/support/alloc.h> #include <grpc/support/string_util.h> #include <stdarg.h> #include <stdio.h> #include <string.h> int gpr_asprintf(char** strp, const char* format, ...) { va_list args; int ret; char buf[64]; size_t strp_buflen; // Use a constant-sized buffer to determine the length. va_start(args, format); ret = vsnprintf(buf, sizeof(buf), format, args); va_end(args); if (ret < 0) { *strp = nullptr; return -1; } // Allocate a new buffer, with space for the NUL terminator. strp_buflen = static_cast<size_t>(ret) + 1; if ((*strp = static_cast<char*>(gpr_malloc(strp_buflen))) == nullptr) { // This shouldn't happen, because gpr_malloc() calls abort(). return -1; } // Return early if we have all the bytes. if (strp_buflen <= sizeof(buf)) { memcpy(*strp, buf, strp_buflen); return ret; } // Try again using the larger buffer. va_start(args, format); ret = vsnprintf(*strp, strp_buflen, format, args); va_end(args); if (static_cast<size_t>(ret) == strp_buflen - 1) { return ret; } // This should never happen. gpr_free(*strp); *strp = nullptr; return -1; } #endif // GPR_POSIX_STRING
Version data entries
1 entries across 1 versions & 1 rubygems
Version | Path |
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grpc-1.68.1 | src/core/util/posix/string.cc |