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Version Control with Subversion, 2nd Edition by Brian W. Fitzpatrick, Ben Collins-Sussman, C. Michael Pilato

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Code Samples

Example 8-1 contains a code segment (written in C) that illustrates some of the concepts we’ve been discussing. It uses both the repository and filesystem interfaces (as can be determined by the prefixes svn_repos_ and svn_fs_ of the function names, respectively) to create a new revision in which a directory is added. You can see the use of an APR pool, which is passed around for memory allocation purposes. Also, the code reveals a somewhat obscure fact about Subversion error handling—all Subversion errors must be explicitly handled to avoid memory leakage (and in some cases, application failure).

Example 8-1. Using the Repository Layer
/* Convert a Subversion error into a simple boolean error code. * * NOTE: Subversion errors must be cleared (using svn_error_clear()) * because they are allocated from the global pool, else memory * leaking occurs. */ #define INT_ERR(expr) \ do { \ svn_error_t *__temperr = (expr); \ if (__temperr) \ { \ svn_error_clear(__temperr); \ return 1; \ } \ return 0; \ } while (0) /* Create a new directory at the path NEW_DIRECTORY in the Subversion * repository located at REPOS_PATH. Perform all memory allocation in * POOL. This function will create a new revision for the addition of * NEW_DIRECTORY. Return zero if the operation completes * successfully, nonzero otherwise. */ static int make_new_directory(const char *repos_path, const char *new_directory, apr_pool_t *pool) { svn_error_t *err; svn_repos_t *repos; svn_fs_t *fs; svn_revnum_t youngest_rev; ...

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