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nano/search.c
Chris Allegretta 5d71514f21 - Fix nano crashing when searching/replacing an invalid regex (try ^*). Changed regexp_init() to return 1 or 0 based on regcomp()'s return value and search_init to exit with an error message (sorry Jordi) 
git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@1406 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
2003-01-29 04:18:37 +00:00

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/* $Id$ */
/**************************************************************************
* search.c *
* *
* Copyright (C) 2000-2003 Chris Allegretta *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2, or (at your option) *
* any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
**************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include "proto.h"
#include "nano.h"
/* Regular expression helper functions */
#ifdef HAVE_REGEX_H
int regexp_init(const char *regexp)
{
/* Hmm, perhaps we should check for whether regcomp returns successfully */
if (regcomp(&search_regexp, regexp, (ISSET(CASE_SENSITIVE) ? 0 : REG_ICASE)
| REG_EXTENDED) != 0)
return 0;
SET(REGEXP_COMPILED);
return 1;
}
void regexp_cleanup(void)
{
UNSET(REGEXP_COMPILED);
regfree(&search_regexp);
}
#endif
void not_found_msg(const char *str)
{
if (strlen(str) <= COLS / 2)
statusbar(_("\"%s\" not found"), str);
else {
char *foo = mallocstrcpy(NULL, str);
foo[COLS / 2] = '\0';
statusbar(_("\"%s...\" not found"), foo);
free(foo);
}
}
void search_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
wrefresh(bottomwin);
if (ISSET(MARK_ISSET))
edit_refresh_clearok();
#ifdef HAVE_REGEX_H
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
#endif
}
void search_init_globals(void)
{
if (last_search == NULL) {
last_search = charalloc(1);
last_search[0] = '\0';
}
if (last_replace == NULL) {
last_replace = charalloc(1);
last_replace[0] = '\0';
}
}
/* Set up the system variables for a search or replace. Return -1 on
* abort, 0 on success, and 1 on rerun calling program. Return -2 to
* run opposite program (search -> replace, replace -> search).
*
* replacing = 1 if we call from do_replace(), 0 if called from
* do_search(). */
int search_init(int replacing)
{
int i = 0;
char *buf;
static char *backupstring = NULL;
search_init_globals();
if (backupstring == NULL)
backupstring = mallocstrcpy(backupstring, "");
#ifndef NANO_SMALL
search_history.current = (historytype *)&search_history.next;
#endif
if (last_search[0] != '\0') {
buf = charalloc(COLS / 3 + 7);
/* We use COLS / 3 here because we need to see more on the line */
sprintf(buf, " [%.*s%s]", COLS / 3, last_search,
strlen(last_search) > COLS / 3 ? "..." : "");
} else {
buf = charalloc(1);
buf[0] = '\0';
}
/* This is now one simple call. It just does a lot */
i = statusq(0, replacing ? replace_list : whereis_list, backupstring,
#ifndef NANO_SMALL
&search_history,
#endif
"%s%s%s%s%s%s",
_("Search"),
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(CASE_SENSITIVE) ? _(" [Case Sensitive]") : "",
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(USE_REGEXP) ? _(" [Regexp]") : "",
/* This string is just a modifier for the search prompt,
no grammar is implied */
ISSET(REVERSE_SEARCH) ? _(" [Backwards]") : "",
replacing ? _(" (to replace)") : "",
buf);
/* Release buf now that we don't need it anymore */
free(buf);
/* Cancel any search, or just return with no previous search */
if (i == -1 || (i < 0 && last_search[0] == '\0')) {
statusbar(_("Search Cancelled"));
reset_cursor();
free(backupstring);
backupstring = NULL;
#ifndef NANO_SMALL
search_history.current = search_history.next;
#endif
return -1;
} else {
switch (i) {
case -2: /* Same string */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP))
/* If answer is "", use last_search! */
regexp_init(last_search);
#endif
break;
case 0: /* They entered something new */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP))
if (regexp_init(answer) == 0) {
statusbar(_("Invalid regex!"));
reset_cursor();
free(backupstring);
backupstring = NULL;
#ifndef NANO_SMALL
search_history.current = search_history.next;
#endif
return -3;
}
#endif
free(backupstring);
backupstring = NULL;
last_replace[0] = '\0';
break;
#ifndef NANO_SMALL
case TOGGLE_CASE_KEY:
TOGGLE(CASE_SENSITIVE);
backupstring = mallocstrcpy(backupstring, answer);
return 1;
case TOGGLE_BACKWARDS_KEY:
TOGGLE(REVERSE_SEARCH);
backupstring = mallocstrcpy(backupstring, answer);
return 1;
#ifdef HAVE_REGEX_H
case TOGGLE_REGEXP_KEY:
TOGGLE(USE_REGEXP);
backupstring = mallocstrcpy(backupstring, answer);
return 1;
#endif
#endif /* !NANO_SMALL */
case NANO_OTHERSEARCH_KEY:
backupstring = mallocstrcpy(backupstring, answer);
return -2; /* Call the opposite search function */
case NANO_FROMSEARCHTOGOTO_KEY:
free(backupstring);
backupstring = NULL;
#ifndef NANO_SMALL
search_history.current = search_history.next;
#endif
i = (int)strtol(answer, &buf, 10); /* Just testing answer here */
if (!(errno == ERANGE || *answer == '\0' || *buf != '\0'))
do_gotoline(-1, 0);
else
do_gotoline_void();
return -3;
default:
do_early_abort();
free(backupstring);
backupstring = NULL;
return -3;
}
}
return 0;
}
int is_whole_word(int curr_pos, const char *datastr, const char *searchword)
{
size_t sln = curr_pos + strlen(searchword);
/* start of line or previous character not a letter and end of line
or next character not a letter */
return (curr_pos < 1 || !isalpha((int)datastr[curr_pos - 1])) &&
(sln == strlen(datastr) || !isalpha((int)datastr[sln]));
}
filestruct *findnextstr(int quiet, int bracket_mode,
const filestruct *begin, int beginx,
const char *needle)
{
filestruct *fileptr = current;
const char *searchstr, *rev_start = NULL, *found = NULL;
int current_x_find = 0;
search_offscreen = 0;
if (!ISSET(REVERSE_SEARCH)) { /* forward search */
/* Argh, current_x is set to -1 by nano.c:do_int_spell_fix(), and
* strlen returns size_t, which is unsigned. */
assert(current_x < 0 || current_x <= strlen(fileptr->data));
current_x_find = current_x;
if (current_x_find < 0 || fileptr->data[current_x_find] != '\0')
current_x_find++;
searchstr = &fileptr->data[current_x_find];
/* Look for needle in searchstr */
while ((found = strstrwrapper(searchstr, needle, rev_start, current_x_find)) == NULL) {
/* finished processing file, get out */
if (search_last_line) {
if (!quiet)
not_found_msg(needle);
update_line(fileptr, current_x);
return NULL;
}
update_line(fileptr, 0);
/* reset current_x_find between lines */
current_x_find = 0;
fileptr = fileptr->next;
if (fileptr == editbot)
search_offscreen = 1;
/* EOF reached?, wrap around once */
if (fileptr == NULL) {
/* don't wrap if looking for bracket match */
if (bracket_mode)
return NULL;
fileptr = fileage;
search_offscreen = 1;
if (!quiet)
statusbar(_("Search Wrapped"));
}
/* Original start line reached */
if (fileptr == begin)
search_last_line = 1;
searchstr = fileptr->data;
}
/* We found an instance */
current_x_find = found - fileptr->data;
/* Ensure we haven't wrapped around again! */
if (search_last_line && current_x_find > beginx) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
}
#ifndef NANO_SMALL
else { /* reverse search */
current_x_find = current_x - 1;
/* Make sure we haven't passed the beginning of the string */
rev_start = &fileptr->data[current_x_find];
searchstr = fileptr->data;
/* Look for needle in searchstr */
while ((found = strstrwrapper(searchstr, needle, rev_start, current_x_find)) == NULL) {
/* finished processing file, get out */
if (search_last_line) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
update_line(fileptr, 0);
/* reset current_x_find between lines */
current_x_find = 0;
fileptr = fileptr->prev;
if (fileptr == edittop->prev)
search_offscreen = 1;
/* SOF reached?, wrap around once */
/* ? */ if (fileptr == NULL) {
if (bracket_mode)
return NULL;
fileptr = filebot;
search_offscreen = 1;
if (!quiet)
statusbar(_("Search Wrapped"));
}
/* Original start line reached */
if (fileptr == begin)
search_last_line = 1;
searchstr = fileptr->data;
rev_start = fileptr->data + strlen(fileptr->data);
}
/* We found an instance */
current_x_find = found - fileptr->data;
/* Ensure we haven't wrapped around again! */
if ((search_last_line) && (current_x_find < beginx)) {
if (!quiet)
not_found_msg(needle);
return NULL;
}
}
#endif /* !NANO_SMALL */
/* Set globals now that we are sure we found something */
current = fileptr;
current_x = current_x_find;
if (!bracket_mode) {
update_line(current, current_x);
placewewant = xplustabs();
reset_cursor();
}
return fileptr;
}
/* Search for a string. */
int do_search(void)
{
int i;
filestruct *fileptr = current, *didfind;
int fileptr_x = current_x;
wrap_reset();
i = search_init(0);
switch (i) {
case -1:
current = fileptr;
search_abort();
return 0;
case -3:
search_abort();
return 0;
case -2:
do_replace();
return 0;
case 1:
do_search();
search_abort();
return 1;
}
/* If answer is now "", copy last_search into answer... */
if (answer[0] == '\0')
answer = mallocstrcpy(answer, last_search);
else
last_search = mallocstrcpy(last_search, answer);
#ifndef NANO_SMALL
/* add this search string to the search history list */
if (answer[0] != '\0')
update_history(&search_history, answer);
#endif /* !NANO_SMALL */
search_last_line = 0;
didfind = findnextstr(FALSE, FALSE, current, current_x, answer);
if (fileptr == current && fileptr_x == current_x && didfind != NULL)
statusbar(_("This is the only occurrence"));
else if (current->lineno <= edittop->lineno
|| current->lineno >= editbot->lineno)
edit_update(current, CENTER);
search_abort();
return 1;
}
void replace_abort(void)
{
/* Identical to search_abort, so we'll call it here. If it
does something different later, we can change it back. For now
it's just a waste to duplicate code */
search_abort();
placewewant = xplustabs();
}
#ifdef HAVE_REGEX_H
int replace_regexp(char *string, int create_flag)
{
/* Split personality here - if create_flag is NULL, just calculate
* the size of the replacement line (necessary because of
* subexpressions like \1 \2 \3 in the replaced text). */
char *c;
int new_size = strlen(current->data) + 1;
int search_match_count = regmatches[0].rm_eo - regmatches[0].rm_so;
new_size -= search_match_count;
/* Iterate through the replacement text to handle subexpression
* replacement using \1, \2, \3, etc. */
c = last_replace;
while (*c != '\0') {
if (*c != '\\') {
if (create_flag)
*string++ = *c;
c++;
new_size++;
} else {
int num = (int) *(c + 1) - (int) '0';
if (num >= 1 && num <= 9) {
int i = regmatches[num].rm_eo - regmatches[num].rm_so;
if (num > search_regexp.re_nsub) {
/* Ugh, they specified a subexpression that doesn't
* exist. */
return -1;
}
/* Skip over the replacement expression */
c += 2;
/* But add the length of the subexpression to new_size */
new_size += i;
/* And if create_flag is set, append the result of the
* subexpression match to the new line */
if (create_flag) {
strncpy(string, current->data + current_x +
regmatches[num].rm_so, i);
string += i;
}
} else {
if (create_flag)
*string++ = *c;
c++;
new_size++;
}
}
}
if (create_flag)
*string = '\0';
return new_size;
}
#endif
char *replace_line(void)
{
char *copy, *tmp;
int new_line_size;
int search_match_count;
/* Calculate size of new line */
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP)) {
search_match_count = regmatches[0].rm_eo - regmatches[0].rm_so;
new_line_size = replace_regexp(NULL, 0);
/* If they specified an invalid subexpression in the replace
* text, return NULL, indicating an error */
if (new_line_size < 0)
return NULL;
} else {
#else
{
#endif
search_match_count = strlen(last_search);
new_line_size = strlen(current->data) - strlen(last_search) +
strlen(last_replace) + 1;
}
/* Create buffer */
copy = charalloc(new_line_size);
/* Head of Original Line */
strncpy(copy, current->data, current_x);
copy[current_x] = '\0';
/* Replacement Text */
if (!ISSET(USE_REGEXP))
strcat(copy, last_replace);
#ifdef HAVE_REGEX_H
else
replace_regexp(copy + current_x, 1);
#endif
/* The tail of the original line */
/* This may expose other bugs, because it no longer goes through
* each character in the string and tests for string goodness. But
* because we can assume the invariant that current->data is less
* than current_x + strlen(last_search) long, this should be safe.
* Or it will expose bugs ;-) */
tmp = current->data + current_x + search_match_count;
strcat(copy, tmp);
return copy;
}
/* Step through each replace word and prompt user before replacing
* word. Return -1 if the string to replace isn't found at all.
* Otherwise, return the number of replacements made. */
int do_replace_loop(const char *prevanswer, const filestruct *begin,
int *beginx, int wholewords, int *i)
{
int replaceall = 0, numreplaced = -1;
filestruct *fileptr = NULL;
char *copy;
switch (*i) {
case -1: /* Aborted enter */
if (last_replace[0] != '\0')
answer = mallocstrcpy(answer, last_replace);
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
case 0: /* They actually entered something */
break;
default:
if (*i != -2) { /* First page, last page, for example, could
get here */
do_early_abort();
replace_abort();
return 0;
}
}
last_replace = mallocstrcpy(last_replace, answer);
while (1) {
/* Sweet optimization by Rocco here */
fileptr = findnextstr(fileptr || replaceall || search_last_line,
FALSE, begin, *beginx, prevanswer);
if (current->lineno <= edittop->lineno
|| current->lineno >= editbot->lineno)
edit_update(current, CENTER);
/* No more matches. Done! */
if (fileptr == NULL)
break;
/* Make sure only whole words are found */
if (wholewords && !is_whole_word(current_x, fileptr->data, prevanswer))
continue;
/* If we're here, we've found the search string */
if (numreplaced == -1)
numreplaced = 0;
if (!replaceall) {
curs_set(0);
do_replace_highlight(TRUE, prevanswer);
*i = do_yesno(1, 1, _("Replace this instance?"));
do_replace_highlight(FALSE, prevanswer);
curs_set(1);
}
if (*i > 0 || replaceall) { /* Yes, replace it!!!! */
long length_change;
size_t match_len;
if (*i == 2)
replaceall = 1;
copy = replace_line();
if (copy == NULL) {
statusbar(_("Replace failed: unknown subexpression!"));
replace_abort();
return 0;
}
length_change = strlen(copy) - strlen(current->data);
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP))
match_len = regmatches[0].rm_eo - regmatches[0].rm_so;
else
#endif
match_len = strlen(prevanswer);
#ifndef NANO_SMALL
if (current == mark_beginbuf && mark_beginx > current_x) {
if (mark_beginx < current_x + match_len)
mark_beginx = current_x;
else
mark_beginx += length_change;
}
#endif
assert(0 <= match_len + length_change);
if (current == begin && current_x <= *beginx) {
if (*beginx < current_x + match_len)
*beginx = current_x + match_len;
*beginx += length_change;
}
/* Set the cursor at the last character of the replacement
* text, so searching will resume after the replacement text.
* Note that current_x might be set to -1 here. */
#ifndef NANO_SMALL
if (!ISSET(REVERSE_SEARCH))
#endif
current_x += match_len + length_change - 1;
/* Cleanup */
totsize += length_change;
free(current->data);
current->data = copy;
edit_refresh();
set_modified();
numreplaced++;
} else if (*i == -1) /* Abort, else do nothing and continue
loop */
break;
}
/* If text has been added to the magicline, make a new magicline. */
if (filebot->data[0] != '\0')
new_magicline();
return numreplaced;
}
/* Replace a string. */
int do_replace(void)
{
int i, numreplaced, beginx;
filestruct *begin;
char *prevanswer = NULL;
if (ISSET(VIEW_MODE)) {
print_view_warning();
replace_abort();
return 0;
}
i = search_init(1);
switch (i) {
case -1:
statusbar(_("Replace Cancelled"));
replace_abort();
return 0;
case 1:
do_replace();
return 1;
case -2:
do_search();
return 0;
case -3:
replace_abort();
return 0;
}
#ifndef NANO_SMALL
if (answer[0] != '\0')
update_history(&search_history, answer);
#endif /* !NANO_SMALL */
/* If answer is now == "", copy last_search into answer
(and prevanswer)... */
if (answer[0] == '\0')
answer = mallocstrcpy(answer, last_search);
else
last_search = mallocstrcpy(last_search, answer);
prevanswer = mallocstrcpy(prevanswer, last_search);
#ifndef NANO_SMALL
replace_history.current = (historytype *)&replace_history.next;
last_replace = mallocstrcpy(last_replace, "");
#endif
i = statusq(0, replace_list_2, last_replace,
#ifndef NANO_SMALL
&replace_history,
#endif
_("Replace with"));
#ifndef NANO_SMALL
if (i == 0 && answer[0] != '\0')
update_history(&replace_history, answer);
#endif /* !NANO_SMALL */
begin = current;
beginx = current_x;
search_last_line = 0;
numreplaced = do_replace_loop(prevanswer, begin, &beginx, FALSE, &i);
/* restore where we were */
current = begin;
current_x = beginx;
renumber_all();
edit_update(current, CENTER);
if (numreplaced >= 0)
statusbar(__("Replaced %d occurrence", "Replaced %d occurrences",
numreplaced), numreplaced);
else
not_found_msg(prevanswer);
replace_abort();
return 1;
}
void goto_abort(void)
{
UNSET(KEEP_CUTBUFFER);
display_main_list();
}
int do_gotoline(int line, int save_pos)
{
if (line <= 0) { /* Ask for it */
if (statusq(0, goto_list, (line ? answer : ""),
#ifndef NANO_SMALL
0,
#endif
_("Enter line number"))) {
statusbar(_("Aborted"));
goto_abort();
return 0;
}
line = atoi(answer);
/* Bounds check */
if (line <= 0) {
statusbar(_("Come on, be reasonable"));
goto_abort();
return 0;
}
}
for (current = fileage; current->next != NULL && line > 1; line--)
current = current->next;
current_x = 0;
/* if save_pos is nonzero, don't change the cursor position when
updating the edit window */
if (save_pos)
edit_update(current, NONE);
else
edit_update(current, CENTER);
placewewant = 0;
goto_abort();
return 1;
}
int do_gotoline_void(void)
{
return do_gotoline(0, 0);
}
#if defined(ENABLE_MULTIBUFFER) || !defined(DISABLE_SPELLER)
void do_gotopos(int line, int pos_x, int pos_y, int pos_placewewant)
{
/* since do_gotoline() resets the x-coordinate but not the
y-coordinate, set the coordinates up this way */
current_y = pos_y;
do_gotoline(line, 1);
/* make sure that the x-coordinate is sane here */
if (pos_x > strlen(current->data))
pos_x = strlen(current->data);
/* set the rest of the coordinates up */
current_x = pos_x;
placewewant = pos_placewewant;
update_line(current, pos_x);
}
#endif
#if !defined(NANO_SMALL) && defined(HAVE_REGEX_H)
int do_find_bracket(void)
{
char ch_under_cursor, wanted_ch;
const char *pos, *brackets = "([{<>}])";
char regexp_pat[] = "[ ]";
int offset, have_search_offscreen = 0, flagsave, current_x_save, count = 1;
filestruct *current_save;
ch_under_cursor = current->data[current_x];
/* if ((!(pos = strchr(brackets, ch_under_cursor))) || (!((offset = pos - brackets) < 8))) { */
if (((pos = strchr(brackets, ch_under_cursor)) == NULL) || (((offset = pos - brackets) < 8) == 0)) {
statusbar(_("Not a bracket"));
return 1;
}
blank_statusbar_refresh();
wanted_ch = *(brackets + ((strlen(brackets) - (offset + 1))));
current_x_save = current_x;
current_save = current;
flagsave = flags;
SET(USE_REGEXP);
/* apparent near redundancy with regexp_pat[] here is needed, [][] works, [[]] doesn't */
if (offset < (strlen(brackets) / 2)) { /* on a left bracket */
regexp_pat[1] = wanted_ch;
regexp_pat[2] = ch_under_cursor;
UNSET(REVERSE_SEARCH);
} else { /* on a right bracket */
regexp_pat[1] = ch_under_cursor;
regexp_pat[2] = wanted_ch;
SET(REVERSE_SEARCH);
}
regexp_init(regexp_pat);
while (1) {
search_last_line = 0;
if (findnextstr(1, 1, current, current_x, regexp_pat) != NULL) {
have_search_offscreen |= search_offscreen;
/* found identical bracket */
if (current->data[current_x] == ch_under_cursor)
count++;
else {
/* found complementary bracket */
if (!(--count)) {
if (have_search_offscreen)
edit_update(current, CENTER);
else
update_line(current, current_x);
placewewant = xplustabs();
reset_cursor();
break;
}
}
} else {
/* didn't find either left or right bracket */
statusbar(_("No matching bracket"));
current_x = current_x_save;
current = current_save;
break;
}
}
if (ISSET(REGEXP_COMPILED))
regexp_cleanup();
flags = flagsave;
return 0;
}
#endif
#ifndef NANO_SMALL
/*
* search and replace history list support functions
*/
/* initialize search and replace history lists */
void history_init(void)
{
search_history.next = (historytype *)&search_history.prev;
search_history.prev = NULL;
search_history.tail = (historytype *)&search_history.next;
search_history.current = search_history.next;
search_history.count = 0;
search_history.len = 0;
replace_history.next = (historytype *)&replace_history.prev;
replace_history.prev = NULL;
replace_history.tail = (historytype *)&replace_history.next;
replace_history.current = replace_history.next;
replace_history.count = 0;
replace_history.len = 0;
}
/* find first node containing string *s in history list *h */
historytype *find_node(historytype *h, char *s)
{
for (; h->next != NULL; h = h->next)
if (strcmp(s, h->data) == 0)
return h;
return NULL;
}
/* remove node *r */
void remove_node(historytype *r)
{
r->prev->next = r->next;
r->next->prev = r->prev;
free(r->data);
free(r);
}
/* add a node after node *h */
void insert_node(historytype *h, const char *s)
{
historytype *a;
a = nmalloc(sizeof(historytype));
a->next = h->next;
a->prev = h->next->prev;
h->next->prev = a;
h->next = a;
a->data = mallocstrcpy(NULL, s);
}
/* update history list */
void update_history(historyheadtype *h, char *s)
{
historytype *p;
if ((p = find_node(h->next, s)) != NULL) {
if (p == h->next) /* catch delete and re-insert of
same string in 1st node */
goto up_hs;
remove_node(p); /* delete identical older string */
h->count--;
}
if (h->count == MAX_SEARCH_HISTORY) { /* list 'full', delete oldest */
remove_node(h->tail);
h->count--;
}
insert_node((historytype *)h, s);
h->count++;
SET(HISTORY_CHANGED);
up_hs:
h->current = h->next;
}
/* return a pointer to either the next older history or NULL if no more */
char *get_history_older(historyheadtype *h)
{
if (h->current->next != NULL) { /* any older entries? */
h->current = h->current->next; /* yes */
return h->current->data; /* return it */
}
return NULL; /* end of list */
}
char *get_history_newer(historyheadtype *h)
{
if (h->current->prev != NULL) {
h->current = h->current->prev;
if (h->current->prev != NULL)
return h->current->data;
}
return NULL;
}
/* get a completion */
char *get_history_completion(historyheadtype *h, char *s)
{
historytype *p;
for (p = h->current->next; p->next != NULL; p = p->next) {
if (strncmp(s, p->data, h->len) == 0 && strlen(p->data) != h->len) {
h->current = p;
return p->data;
}
}
h->current = (historytype*)h;
null_at(&s, h->len);
return s;
}
/* free a history list */
void free_history(historyheadtype *h)
{
historytype *p, *n;
for (p = h->next; (n = p->next); p = n)
remove_node(p);
}
/* end of history support functions */
#endif /* !NANO_SMALL */
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