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os/env.c: document remove_tail() properly

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This commit is contained in:
Felipe Oliveira Carvalho 2016-04-01 08:45:17 -03:00
parent a453c5ce24
commit 128579f7fc
1 changed files with 29 additions and 9 deletions
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38
src/nvim/os/env.c
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@ -456,17 +456,37 @@ static char *vim_version_dir(const char *vimdir)
return NULL;
}
/// If the string between "p" and "pend" ends in "name/", return "pend" minus
/// the length of "name/". Otherwise return "pend".
static char *remove_tail(char *p, char *pend, char *name)
/// If `dirname + "/"` precedes `pend` in the path, return the pointer to
/// `dirname + "/" + pend`. Otherwise return `pend`.
///
/// Examples (path = /usr/local/share/nvim/runtime/doc/help.txt):
///
/// pend = help.txt
/// dirname = doc
/// -> doc/help.txt
///
/// pend = doc/help.txt
/// dirname = runtime
/// -> runtime/doc/help.txt
///
/// pend = runtime/doc/help.txt
/// dirname = vim74
/// -> runtime/doc/help.txt
///
/// @param path Path to a file
/// @param pend A suffix of the path
/// @param dirname The immediate path fragment before the pend
/// @return The new pend including dirname or just pend
static char *remove_tail(char *path, char *pend, char *dirname)
{
size_t len = STRLEN(name) + 1;
char *newend = pend - len;
size_t len = STRLEN(dirname);
char *new_tail = pend - len - 1;
if (newend >= p
&& fnamencmp((char_u *)newend, (char_u *)name, len - 1) == 0
&& (newend == p || after_pathsep(p, newend)))
return newend;
if (new_tail >= path
&& fnamencmp((char_u *)new_tail, (char_u *)dirname, len) == 0
&& (new_tail == path || after_pathsep(path, new_tail))) {
return new_tail;
}
return pend;
}