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os/env: Add functions that can iterate over colon-separated variables

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ZyX 2015-08-01 01:51:19 +03:00
parent c2dd07448f
commit 674629be0c
1 changed files with 68 additions and 0 deletions
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68
src/nvim/os/env.c
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@ -415,6 +415,74 @@ static char *remove_tail(char *p, char *pend, char *name)
return pend;
}
/// Iterate over colon-separated list
///
/// @note Environment variables must not be modified during iteration.
///
/// @param[in] val Value of the environment variable to iterate over.
/// @param[in] iter Pointer used for iteration. Must be NULL on first
/// iteration.
/// @param[out] dir Location where pointer to the start of the current
/// directory name should be saved. May be set to NULL.
/// @param[out] len Location where current directory length should be saved.
///
/// @return Next iter argument value or NULL when iteration should stop.
const void *vim_colon_env_iter(const char *const val,
const void *const iter,
const char **const dir,
size_t *const len)
FUNC_ATTR_NONNULL_ARG(1,3,4) FUNC_ATTR_WARN_UNUSED_RESULT
{
const char *varval = (const char *) iter;
if (varval == NULL) {
varval = val;
}
*dir = varval;
const char *const dirend = strchr(varval, ':');
if (dirend == NULL) {
*len = strlen(varval);
return NULL;
} else {
*len = (size_t) (dirend - varval);
return dirend + 1;
}
}
/// Iterate over colon-separated list in reverse order
///
/// @note Environment variables must not be modified during iteration.
///
/// @param[in] val Value of the environment variable to iterate over.
/// @param[in] iter Pointer used for iteration. Must be NULL on first
/// iteration.
/// @param[out] dir Location where pointer to the start of the current
/// directory name should be saved. May be set to NULL.
/// @param[out] len Location where current directory length should be saved.
///
/// @return Next iter argument value or NULL when iteration should stop.
const void *vim_colon_env_iter_rev(const char *const val,
const void *const iter,
const char **const dir,
size_t *const len)
FUNC_ATTR_NONNULL_ARG(1,3,4) FUNC_ATTR_WARN_UNUSED_RESULT
{
const char *varend = (const char *) iter;
if (varend == NULL) {
varend = val + strlen(val) - 1;
}
const size_t varlen = (size_t) (varend - val) + 1;
const char *const colon = xmemrchr(val, ':', varlen);
if (colon == NULL) {
*len = varlen;
*dir = val;
return NULL;
} else {
*dir = colon + 1;
*len = (size_t) (varend - colon);
return colon - 1;
}
}
/// Vim's version of getenv().
/// Special handling of $HOME, $VIM and $VIMRUNTIME, allowing the user to
/// override the vim runtime directory at runtime. Also does ACP to 'enc'