thodg/libgit2/tests/buf/oom.c

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• Hash : 4aa664ae
  Author :
  Date : 2015-02-10T23:55:07
  

  git_buf_grow_by: increase buf asize incrementally Introduce `git_buf_grow_by` to incrementally increase the size of a `git_buf`, performing an overflow calculation on the growth.

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• tests/buf/oom.c

• #include "clar_libgit2.h"
  #include "buffer.h"
  
  #if defined(GIT_ARCH_64)
  #define TOOBIG 0xffffffffffffff00
  #else
  #define TOOBIG 0xffffff00
  #endif
  
  /**
   * If we make a ridiculously large request the first time we
   * actually allocate some space in the git_buf, the realloc()
   * will fail.  And because the git_buf_grow() wrapper always
   * sets mark_oom, the code in git_buf_try_grow() will free
   * the internal buffer and set it to git_buf__oom.
   * 
   * We initialized the internal buffer to (the static variable)
   * git_buf__initbuf.  The purpose of this test is to make sure
   * that we don't try to free the static buffer.
   */
  void test_buf_oom__grow(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	git_buf_clear(&buf);
  
  	cl_assert(git_buf_grow(&buf, TOOBIG) == -1);
  	cl_assert(git_buf_oom(&buf));
  
  	git_buf_free(&buf);
  }
  
  void test_buf_oom__grow_by(void)
  {
  	git_buf buf = GIT_BUF_INIT;
  
  	buf.size = SIZE_MAX-10;
  
  	cl_assert(git_buf_grow_by(&buf, 50) == -1);
  	cl_assert(git_buf_oom(&buf));
  }
  

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