thodg/libgit2/src/allocators/failalloc.c
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Hash : 08f28ff5
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Date : 2020-07-10T08:57:05
alloc: set up an allocator that fails before library init We require the library to be initialized with git_libgit2_init before it is functional. However, if a user tries to uses the library without doing so - as they might when getting started with the library for the first time - we will likely crash. This commit introduces some guard rails - now instead of having _no_ allocator by default, we'll have an allocator that always fails, and never tries to set an error message (since the thread-local state is set up by git_libgit2_init). We've modified the error retrieval function to (try to) ensure that the library has been initialized before getting the thread-local error message. (Unfortunately, we cannot determine if the thread local storage has actually been configured, this does require initialization by git_libgit2_init. But a naive attempt should be good enough for most cases.)
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src/allocators/failalloc.c
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/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #include "failalloc.h" void *git_failalloc_malloc(size_t len, const char *file, int line) { GIT_UNUSED(len); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } void *git_failalloc_calloc(size_t nelem, size_t elsize, const char *file, int line) { GIT_UNUSED(nelem); GIT_UNUSED(elsize); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } char *git_failalloc_strdup(const char *str, const char *file, int line) { GIT_UNUSED(str); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } char *git_failalloc_strndup(const char *str, size_t n, const char *file, int line) { GIT_UNUSED(str); GIT_UNUSED(n); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } char *git_failalloc_substrdup(const char *start, size_t n, const char *file, int line) { GIT_UNUSED(start); GIT_UNUSED(n); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } void *git_failalloc_realloc(void *ptr, size_t size, const char *file, int line) { GIT_UNUSED(ptr); GIT_UNUSED(size); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } void *git_failalloc_reallocarray(void *ptr, size_t nelem, size_t elsize, const char *file, int line) { GIT_UNUSED(ptr); GIT_UNUSED(nelem); GIT_UNUSED(elsize); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } void *git_failalloc_mallocarray(size_t nelem, size_t elsize, const char *file, int line) { GIT_UNUSED(nelem); GIT_UNUSED(elsize); GIT_UNUSED(file); GIT_UNUSED(line); return NULL; } void git_failalloc_free(void *ptr) { GIT_UNUSED(ptr); }