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/* $Id: cmd.c,v 1.128 2009-11-04 22:42:31 tcunha Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <fnmatch.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
const struct cmd_entry *cmd_table[] = {
&cmd_attach_session_entry,
&cmd_bind_key_entry,
&cmd_break_pane_entry,
&cmd_choose_client_entry,
&cmd_choose_session_entry,
&cmd_choose_window_entry,
&cmd_clear_history_entry,
&cmd_clock_mode_entry,
&cmd_command_prompt_entry,
&cmd_confirm_before_entry,
&cmd_copy_buffer_entry,
&cmd_copy_mode_entry,
&cmd_delete_buffer_entry,
&cmd_detach_client_entry,
&cmd_display_message_entry,
&cmd_display_panes_entry,
&cmd_down_pane_entry,
&cmd_find_window_entry,
&cmd_has_session_entry,
&cmd_if_shell_entry,
&cmd_kill_pane_entry,
&cmd_kill_server_entry,
&cmd_kill_session_entry,
&cmd_kill_window_entry,
&cmd_last_window_entry,
&cmd_link_window_entry,
&cmd_list_buffers_entry,
&cmd_list_clients_entry,
&cmd_list_commands_entry,
&cmd_list_keys_entry,
&cmd_list_panes_entry,
&cmd_list_sessions_entry,
&cmd_list_windows_entry,
&cmd_load_buffer_entry,
&cmd_lock_client_entry,
&cmd_lock_server_entry,
&cmd_lock_session_entry,
&cmd_move_window_entry,
&cmd_new_session_entry,
&cmd_new_window_entry,
&cmd_next_layout_entry,
&cmd_next_window_entry,
&cmd_paste_buffer_entry,
&cmd_pipe_pane_entry,
&cmd_previous_layout_entry,
&cmd_previous_window_entry,
&cmd_refresh_client_entry,
&cmd_rename_session_entry,
&cmd_rename_window_entry,
&cmd_resize_pane_entry,
&cmd_respawn_window_entry,
&cmd_rotate_window_entry,
&cmd_run_shell_entry,
&cmd_save_buffer_entry,
&cmd_select_layout_entry,
&cmd_select_pane_entry,
&cmd_select_prompt_entry,
&cmd_select_window_entry,
&cmd_send_keys_entry,
&cmd_send_prefix_entry,
&cmd_server_info_entry,
&cmd_set_buffer_entry,
&cmd_set_environment_entry,
&cmd_set_option_entry,
&cmd_set_window_option_entry,
&cmd_show_buffer_entry,
&cmd_show_environment_entry,
&cmd_show_options_entry,
&cmd_show_window_options_entry,
&cmd_source_file_entry,
&cmd_split_window_entry,
&cmd_start_server_entry,
&cmd_suspend_client_entry,
&cmd_swap_pane_entry,
&cmd_swap_window_entry,
&cmd_switch_client_entry,
&cmd_unbind_key_entry,
&cmd_unlink_window_entry,
&cmd_up_pane_entry,
NULL
};
struct session *cmd_newest_session(struct sessions *);
struct client *cmd_newest_client(void);
struct client *cmd_lookup_client(const char *);
struct session *cmd_lookup_session(const char *, int *);
struct winlink *cmd_lookup_window(struct session *, const char *, int *);
int cmd_lookup_index(struct session *, const char *, int *);
int
cmd_pack_argv(int argc, char **argv, char *buf, size_t len)
{
size_t arglen;
int i;
*buf = '\0';
for (i = 0; i < argc; i++) {
if (strlcpy(buf, argv[i], len) >= len)
return (-1);
arglen = strlen(argv[i]) + 1;
buf += arglen;
len -= arglen;
}
return (0);
}
int
cmd_unpack_argv(char *buf, size_t len, int argc, char ***argv)
{
int i;
size_t arglen;
if (argc == 0)
return (0);
*argv = xcalloc(argc, sizeof **argv);
buf[len - 1] = '\0';
for (i = 0; i < argc; i++) {
if (len == 0) {
cmd_free_argv(argc, *argv);
return (-1);
}
arglen = strlen(buf) + 1;
(*argv)[i] = xstrdup(buf);
buf += arglen;
len -= arglen;
}
return (0);
}
void
cmd_free_argv(int argc, char **argv)
{
int i;
if (argc == 0)
return;
for (i = 0; i < argc; i++) {
if (argv[i] != NULL)
xfree(argv[i]);
}
xfree(argv);
}
struct cmd *
cmd_parse(int argc, char **argv, char **cause)
{
const struct cmd_entry **entryp, *entry;
struct cmd *cmd;
char s[BUFSIZ];
int opt, ambiguous = 0;
*cause = NULL;
if (argc == 0) {
xasprintf(cause, "no command");
return (NULL);
}
entry = NULL;
for (entryp = cmd_table; *entryp != NULL; entryp++) {
if ((*entryp)->alias != NULL &&
strcmp((*entryp)->alias, argv[0]) == 0) {
ambiguous = 0;
entry = *entryp;
break;
}
if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
continue;
if (entry != NULL)
ambiguous = 1;
entry = *entryp;
/* Bail now if an exact match. */
if (strcmp(entry->name, argv[0]) == 0)
break;
}
if (ambiguous)
goto ambiguous;
if (entry == NULL) {
xasprintf(cause, "unknown command: %s", argv[0]);
return (NULL);
}
optreset = 1;
optind = 1;
if (entry->parse == NULL) {
while ((opt = getopt(argc, argv, "")) != -1) {
switch (opt) {
default:
goto usage;
}
}
argc -= optind;
argv += optind;
if (argc != 0)
goto usage;
}
cmd = xmalloc(sizeof *cmd);
cmd->entry = entry;
cmd->data = NULL;
if (entry->parse != NULL) {
if (entry->parse(cmd, argc, argv, cause) != 0) {
xfree(cmd);
return (NULL);
}
}
return (cmd);
ambiguous:
*s = '\0';
for (entryp = cmd_table; *entryp != NULL; entryp++) {
if (strncmp((*entryp)->name, argv[0], strlen(argv[0])) != 0)
continue;
if (strlcat(s, (*entryp)->name, sizeof s) >= sizeof s)
break;
if (strlcat(s, ", ", sizeof s) >= sizeof s)
break;
}
s[strlen(s) - 2] = '\0';
xasprintf(cause, "ambiguous command: %s, could be: %s", argv[0], s);
return (NULL);
usage:
xasprintf(cause, "usage: %s %s", entry->name, entry->usage);
return (NULL);
}
int
cmd_exec(struct cmd *cmd, struct cmd_ctx *ctx)
{
return (cmd->entry->exec(cmd, ctx));
}
void
cmd_free(struct cmd *cmd)
{
if (cmd->data != NULL && cmd->entry->free != NULL)
cmd->entry->free(cmd);
xfree(cmd);
}
size_t
cmd_print(struct cmd *cmd, char *buf, size_t len)
{
if (cmd->entry->print == NULL) {
return (xsnprintf(buf, len, "%s", cmd->entry->name));
}
return (cmd->entry->print(cmd, buf, len));
}
/*
* Figure out the current session. Use: 1) the current session, if the command
* context has one; 2) the session containing the pty of the calling client, if
* any 3) the session specified in the TMUX variable from the environment (as
* passed from the client); 3) the newest session.
*/
struct session *
cmd_current_session(struct cmd_ctx *ctx)
{
struct msg_command_data *data = ctx->msgdata;
struct client *c = ctx->cmdclient;
struct session *s;
struct sessions ss;
struct winlink *wl;
struct window_pane *wp;
u_int i;
int found;
if (ctx->curclient != NULL && ctx->curclient->session != NULL)
return (ctx->curclient->session);
/*
* If the name of the calling client's pty is know, build a list of the
* sessions that contain it and if any choose either the first or the
* newest.
*/
if (c != NULL && c->tty.path != NULL) {
ARRAY_INIT(&ss);
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
continue;
found = 0;
RB_FOREACH(wl, winlinks, &s->windows) {
TAILQ_FOREACH(wp, &wl->window->panes, entry) {
if (strcmp(wp->tty, c->tty.path) == 0) {
found = 1;
break;
}
}
if (found)
break;
}
if (found)
ARRAY_ADD(&ss, s);
}
s = cmd_newest_session(&ss);
ARRAY_FREE(&ss);
if (s != NULL)
return (s);
}
/* Use the session from the TMUX environment variable. */
if (data != NULL && data->pid != -1) {
if (data->pid != getpid())
return (NULL);
if (data->idx > ARRAY_LENGTH(&sessions))
return (NULL);
if ((s = ARRAY_ITEM(&sessions, data->idx)) == NULL)
return (NULL);
return (s);
}
return (cmd_newest_session(&sessions));
}
/* Find the newest session. */
struct session *
cmd_newest_session(struct sessions *ss)
{
struct session *s, *snewest;
struct timeval *tv = NULL;
u_int i;
snewest = NULL;
for (i = 0; i < ARRAY_LENGTH(ss); i++) {
if ((s = ARRAY_ITEM(ss, i)) == NULL)
continue;
if (tv == NULL || timercmp(&s->creation_time, tv, >)) {
snewest = s;
tv = &s->creation_time;
}
}
return (snewest);
}
/* Find the newest client. */
struct client *
cmd_newest_client(void)
{
struct client *c, *cnewest;
struct timeval *tv = NULL;
u_int i;
cnewest = NULL;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
if ((c = ARRAY_ITEM(&clients, i)) == NULL)
continue;
if (c->session == NULL)
continue;
if (tv == NULL || timercmp(&c->creation_time, tv, >)) {
cnewest = c;
tv = &c->creation_time;
}
}
return (cnewest);
}
/* Find the target client or report an error and return NULL. */
struct client *
cmd_find_client(struct cmd_ctx *ctx, const char *arg)
{
struct client *c, *lastc;
struct session *s;
char *tmparg;
size_t arglen;
u_int i;
/* A NULL argument means the current client. */
if (arg == NULL) {
if (ctx->curclient != NULL)
return (ctx->curclient);
/*
* No current client set. Find the current session and see if
* it has only one client.
*/
s = cmd_current_session(ctx);
if (s != NULL) {
lastc = NULL;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c != NULL && c->session == s) {
if (lastc != NULL)
break;
lastc = c;
}
}
if (i == ARRAY_LENGTH(&clients) && lastc != NULL)
return (lastc);
}
return (cmd_newest_client());
}
tmparg = xstrdup(arg);
/* Trim a single trailing colon if any. */
arglen = strlen(tmparg);
if (arglen != 0 && tmparg[arglen - 1] == ':')
tmparg[arglen - 1] = '\0';
/* Find the client, if any. */
c = cmd_lookup_client(tmparg);
/* If no client found, report an error. */
if (c == NULL)
ctx->error(ctx, "client not found: %s", tmparg);
xfree(tmparg);
return (c);
}
/*
* Lookup a client by device path. Either of a full match and a match without a
* leading _PATH_DEV ("/dev/") is accepted.
*/
struct client *
cmd_lookup_client(const char *name)
{
struct client *c;
const char *path;
u_int i;
for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
c = ARRAY_ITEM(&clients, i);
if (c == NULL || c->session == NULL)
continue;
path = c->tty.path;
/* Check for exact matches. */
if (strcmp(name, path) == 0)
return (c);
/* Check without leading /dev if present. */
if (strncmp(path, _PATH_DEV, (sizeof _PATH_DEV) - 1) != 0)
continue;
if (strcmp(name, path + (sizeof _PATH_DEV) - 1) == 0)
return (c);
}
return (NULL);
}
/* Lookup a session by name. If no session is found, NULL is returned. */
struct session *
cmd_lookup_session(const char *name, int *ambiguous)
{
struct session *s, *sfound;
u_int i;
*ambiguous = 0;
/*
* Look for matches. First look for exact matches - session names must
* be unique so an exact match can't be ambigious and can just be
* returned.
*/
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
continue;
if (strcmp(name, s->name) == 0)
return (s);
}
/*
* Otherwise look for partial matches, returning early if it is found to
* be ambiguous.
*/
sfound = NULL;
for (i = 0; i < ARRAY_LENGTH(&sessions); i++) {
if ((s = ARRAY_ITEM(&sessions, i)) == NULL)
continue;
if (strncmp(name, s->name, strlen(name)) == 0 ||
fnmatch(name, s->name, 0) == 0) {
if (sfound != NULL) {
*ambiguous = 1;
return (NULL);
}
sfound = s;
}
}
return (sfound);
}
/*
* Lookup a window or return -1 if not found or ambigious. First try as an
* index and if invalid, use fnmatch or leading prefix. Return NULL but fill in
* idx if the window index is a valid number but there is now window with that
* index.
*/
struct winlink *
cmd_lookup_window(struct session *s, const char *name, int *ambiguous)
{
struct winlink *wl, *wlfound;
const char *errstr;
u_int idx;
*ambiguous = 0;
/* First see if this is a valid window index in this session. */
idx = strtonum(name, 0, INT_MAX, &errstr);
if (errstr == NULL) {
if ((wl = winlink_find_by_index(&s->windows, idx)) != NULL)
return (wl);
}
/* Look for exact matches, error if more than one. */
wlfound = NULL;
RB_FOREACH(wl, winlinks, &s->windows) {
if (strcmp(name, wl->window->name) == 0) {
if (wlfound != NULL) {
*ambiguous = 1;
return (NULL);
}
wlfound = wl;
}
}
if (wlfound != NULL)
return (wlfound);
/* Now look for pattern matches, again error if multiple. */
wlfound = NULL;
RB_FOREACH(wl, winlinks, &s->windows) {
if (strncmp(name, wl->window->name, strlen(name)) == 0 ||
fnmatch(name, wl->window->name, 0) == 0) {
if (wlfound != NULL) {
*ambiguous = 1;
return (NULL);
}
wlfound = wl;
}
}
if (wlfound != NULL)
return (wlfound);
return (NULL);
}
/*
* Find a window index - if the window doesn't exist, check if it is a
* potential index and return it anyway.
*/
int
cmd_lookup_index(struct session *s, const char *name, int *ambiguous)
{
struct winlink *wl;
const char *errstr;
u_int idx;
if ((wl = cmd_lookup_window(s, name, ambiguous)) != NULL)
return (wl->idx);
if (*ambiguous)
return (-1);
idx = strtonum(name, 0, INT_MAX, &errstr);
if (errstr == NULL)
return (idx);
return (-1);
}
/* Find the target session or report an error and return NULL. */
struct session *
cmd_find_session(struct cmd_ctx *ctx, const char *arg)
{
struct session *s;
struct client *c;
char *tmparg;
size_t arglen;
int ambiguous;
/* A NULL argument means the current session. */
if (arg == NULL)
return (cmd_current_session(ctx));
tmparg = xstrdup(arg);
/* Trim a single trailing colon if any. */
arglen = strlen(tmparg);
if (arglen != 0 && tmparg[arglen - 1] == ':')
tmparg[arglen - 1] = '\0';
/* Find the session, if any. */
s = cmd_lookup_session(tmparg, &ambiguous);
/* If it doesn't, try to match it as a client. */
if (s == NULL && (c = cmd_lookup_client(tmparg)) != NULL)
s = c->session;
/* If no session found, report an error. */
if (s == NULL) {
if (ambiguous)
ctx->error(ctx, "more than one session: %s", tmparg);
else
ctx->error(ctx, "session not found: %s", tmparg);
}
xfree(tmparg);
return (s);
}
/* Find the target session and window or report an error and return NULL. */
struct winlink *
cmd_find_window(struct cmd_ctx *ctx, const char *arg, struct session **sp)
{
struct session *s;
struct winlink *wl;
const char *winptr;
char *sessptr = NULL;
int ambiguous = 0;
/*
* Find the current session. There must always be a current session, if
* it can't be found, report an error.
*/
if ((s = cmd_current_session(ctx)) == NULL) {
ctx->error(ctx, "can't establish current session");
return (NULL);
}
/* A NULL argument means the current session and window. */
if (arg == NULL) {
if (sp != NULL)
*sp = s;
return (s->curw);
}
/* Time to look at the argument. If it is empty, that is an error. */
if (*arg == '\0')
goto not_found;
/* Find the separating colon and split into window and session. */
winptr = strchr(arg, ':');
if (winptr == NULL)
goto no_colon;
winptr++; /* skip : */
sessptr = xstrdup(arg);
*strchr(sessptr, ':') = '\0';
/* Try to lookup the session if present. */
if (*sessptr != '\0') {
if ((s = cmd_lookup_session(sessptr, &ambiguous)) == NULL)
goto no_session;
}
if (sp != NULL)
*sp = s;
/*
* Then work out the window. An empty string is the current window,
* otherwise try to look it up in the session.
*/
if (*winptr == '\0')
wl = s->curw;
else if ((wl = cmd_lookup_window(s, winptr, &ambiguous)) == NULL)
goto not_found;
if (sessptr != NULL)
xfree(sessptr);
return (wl);
no_colon:
/* No colon in the string, first try as a window then as a session. */
if ((wl = cmd_lookup_window(s, arg, &ambiguous)) == NULL) {
if (ambiguous)
goto not_found;
if ((s = cmd_lookup_session(arg, &ambiguous)) == NULL)
goto no_session;
wl = s->curw;
}
if (sp != NULL)
*sp = s;
return (wl);
no_session:
if (ambiguous)
ctx->error(ctx, "multiple sessions: %s", arg);
else
ctx->error(ctx, "session not found: %s", arg);
if (sessptr != NULL)
xfree(sessptr);
return (NULL);
not_found:
if (ambiguous)
ctx->error(ctx, "multiple windows: %s", arg);
else
ctx->error(ctx, "window not found: %s", arg);
if (sessptr != NULL)
xfree(sessptr);
return (NULL);
}
/*
* Find the target session and window index, whether or not it exists in the
* session. Return -2 on error or -1 if no window index is specified. This is
* used when parsing an argument for a window target that may not exist (for
* example if it is going to be created).
*/
int
cmd_find_index(struct cmd_ctx *ctx, const char *arg, struct session **sp)
{
struct session *s;
const char *winptr;
char *sessptr = NULL;
int idx, ambiguous = 0;
/*
* Find the current session. There must always be a current session, if
* it can't be found, report an error.
*/
if ((s = cmd_current_session(ctx)) == NULL) {
ctx->error(ctx, "can't establish current session");
return (-2);
}
/* A NULL argument means the current session and "no window" (-1). */
if (arg == NULL) {
if (sp != NULL)
*sp = s;
return (-1);
}
/* Time to look at the argument. If it is empty, that is an error. */
if (*arg == '\0')
goto not_found;
/* Find the separating colon. If none, assume the current session. */
winptr = strchr(arg, ':');
if (winptr == NULL)
goto no_colon;
winptr++; /* skip : */
sessptr = xstrdup(arg);
*strchr(sessptr, ':') = '\0';
/* Try to lookup the session if present. */
if (sessptr != NULL && *sessptr != '\0') {
if ((s = cmd_lookup_session(sessptr, &ambiguous)) == NULL)
goto no_session;
}
if (sp != NULL)
*sp = s;
/*
* Then work out the window. An empty string is a new window otherwise
* try to look it up in the session.
*/
if (*winptr == '\0')
idx = -1;
else if ((idx = cmd_lookup_index(s, winptr, &ambiguous)) == -1) {
if (ambiguous)
goto not_found;
ctx->error(ctx, "invalid index: %s", arg);
idx = -2;
}
if (sessptr != NULL)
xfree(sessptr);
return (idx);
no_colon:
/* No colon in the string, first try as a window then as a session. */
if ((idx = cmd_lookup_index(s, arg, &ambiguous)) == -1) {
if (ambiguous)
goto not_found;
if ((s = cmd_lookup_session(arg, &ambiguous)) == NULL)
goto no_session;
idx = -1;
}
if (sp != NULL)
*sp = s;
return (idx);
no_session:
if (ambiguous)
ctx->error(ctx, "multiple sessions: %s", arg);
else
ctx->error(ctx, "session not found: %s", arg);
if (sessptr != NULL)
xfree(sessptr);
return (-2);
not_found:
if (ambiguous)
ctx->error(ctx, "multiple windows: %s", arg);
else
ctx->error(ctx, "window not found: %s", arg);
if (sessptr != NULL)
xfree(sessptr);
return (-2);
}
/*
* Find the target session, window and pane number or report an error and
* return NULL. The pane number is separated from the session:window by a .,
* such as mysession:mywindow.0.
*/
struct winlink *
cmd_find_pane(struct cmd_ctx *ctx,
const char *arg, struct session **sp, struct window_pane **wpp)
{
struct session *s;
struct winlink *wl;
const char *period;
char *winptr, *paneptr;
const char *errstr;
u_int idx;
/* Get the current session. */
if ((s = cmd_current_session(ctx)) == NULL) {
ctx->error(ctx, "can't establish current session");
return (NULL);
}
if (sp != NULL)
*sp = s;
/* A NULL argument means the current session, window and pane. */
if (arg == NULL) {
*wpp = s->curw->window->active;
return (s->curw);
}
/* Look for a separating period. */
if ((period = strrchr(arg, '.')) == NULL)
goto no_period;
/* Pull out the window part and parse it. */
winptr = xstrdup(arg);
winptr[period - arg] = '\0';
if (*winptr == '\0')
wl = s->curw;
else if ((wl = cmd_find_window(ctx, winptr, sp)) == NULL)
goto error;
/* Find the pane section and look it up. */
paneptr = winptr + (period - arg) + 1;
if (*paneptr == '\0')
*wpp = wl->window->active;
else {
idx = strtonum(paneptr, 0, INT_MAX, &errstr);
if (errstr != NULL) {
ctx->error(ctx, "pane %s: %s", errstr, paneptr);
goto error;
}
*wpp = window_pane_at_index(wl->window, idx);
if (*wpp == NULL) {
ctx->error(ctx, "no such pane: %u", idx);
goto error;
}
}
xfree(winptr);
return (wl);
no_period:
/* Try as a pane number alone. */
idx = strtonum(arg, 0, INT_MAX, &errstr);
if (errstr != NULL)
goto lookup_window;
/* Try index in the current session and window. */
if ((*wpp = window_pane_at_index(s->curw->window, idx)) == NULL)
goto lookup_window;
return (s->curw);
lookup_window:
/* Try as a window and use the active pane. */
if ((wl = cmd_find_window(ctx, arg, sp)) != NULL)
*wpp = wl->window->active;
return (wl);
error:
xfree(winptr);
return (NULL);
}
/* Replace the first %% or %idx in template by s. */
char *
cmd_template_replace(char *template, const char *s, int idx)
{
char ch;
char *buf, *ptr;
int replaced;
size_t len;
if (strstr(template, "%") == NULL)
return (xstrdup(template));
buf = xmalloc(1);
*buf = '\0';
len = 0;
replaced = 0;
ptr = template;
while (*ptr != '\0') {
switch (ch = *ptr++) {
case '%':
if (*ptr < '1' || *ptr > '9' || *ptr - '0' != idx) {
if (*ptr != '%' || replaced)
break;
replaced = 1;
}
ptr++;
len += strlen(s);
buf = xrealloc(buf, 1, len + 1);
strlcat(buf, s, len + 1);
continue;
}
buf = xrealloc(buf, 1, len + 2);
buf[len++] = ch;
buf[len] = '\0';
}
return (buf);
}