Expand string, placing the result into output, a pointer
to a string (see History Interaction). Returns:
0
If no expansions took place (or, if the only change in
the text was the de-slashifying of the history expansion
character);
1
if expansions did take place;
-1
if there was an error in expansion;
2
if the returned line should only be displayed, but not executed,
as with the :p modifier (see Modifiers).
If an error ocurred in expansion, then output contains a descriptive
error message.
Function: char*history_arg_extract (int first, int last, char *string)
Extract a string segment consisting of the first through last
arguments present in string. Arguments are broken up as in Bash.
Function: char*get_history_event (char *string, int *cindex, int qchar)
Returns the text of the history event beginning at string +
*cindex. *cindex is modified to point to after the event
specifier. At function entry, cindex points to the index into
string where the history event specification begins. qchar
is a character that is allowed to end the event specification in addition
to the ``normal'' terminating characters.
Function: char**history_tokenize (char *string)
Return an array of tokens parsed out of string, much as the
shell might. The tokens are split on white space and on the
characters ()<>;&|$, and shell quoting conventions are
obeyed.