tmux/cmd-load-buffer.c
Tiago Cunha 1df427bc7b Sync OpenBSD patchset 829:
Clean up and simplify tmux command argument parsing.

Originally, tmux commands were parsed in the client process into a
struct with the command data which was then serialised and sent to the
server to be executed. The parsing was later moved into the server (an
argv was sent from the client), but the parse step and intermediate
struct was kept.

This change removes that struct and the separate parse step. Argument
parsing and printing is now common to all commands (in arguments.c) with
each command left with just an optional check function (to validate the
arguments at parse time), the exec function and a function to set up any
key bindings (renamed from the old init function).

This is overall more simple and consistent.

There should be no changes to any commands behaviour or syntax although
as this touches every command please watch for any unexpected changes.
2011-01-07 14:45:34 +00:00

175 lines
4.1 KiB
C

/* $Id: cmd-load-buffer.c,v 1.20 2011-01-07 14:45:34 tcunha Exp $ */
/*
* Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
*
* 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "tmux.h"
/*
* Loads a session paste buffer from a file.
*/
int cmd_load_buffer_exec(struct cmd *, struct cmd_ctx *);
void cmd_load_buffer_callback(struct client *, void *);
const struct cmd_entry cmd_load_buffer_entry = {
"load-buffer", "loadb",
"b:", 1, 1,
CMD_BUFFER_USAGE " path",
0,
NULL,
NULL,
cmd_load_buffer_exec
};
int
cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
{
struct args *args = self->args;
struct client *c = ctx->cmdclient;
FILE *f;
const char *path;
char *pdata, *new_pdata, *cause;
size_t psize;
u_int limit;
int ch, buffer;
int *buffer_ptr;
if (!args_has(args, 'b'))
buffer = -1;
else {
buffer = args_strtonum(args, 'b', 0, INT_MAX, &cause);
if (cause != NULL) {
ctx->error(ctx, "buffer %s", cause);
xfree(cause);
return (-1);
}
}
path = args->argv[0];
if (strcmp(path, "-") == 0) {
if (c == NULL) {
ctx->error(ctx, "%s: can't read from stdin", path);
return (-1);
}
if (c->flags & CLIENT_TERMINAL) {
ctx->error(ctx, "%s: stdin is a tty", path);
return (-1);
}
if (c->stdin_fd == -1) {
ctx->error(ctx, "%s: can't read from stdin", path);
return (-1);
}
buffer_ptr = xmalloc(sizeof *buffer_ptr);
*buffer_ptr = buffer;
c->stdin_data = buffer_ptr;
c->stdin_callback = cmd_load_buffer_callback;
c->references++;
bufferevent_enable(c->stdin_event, EV_READ);
return (1);
}
if ((f = fopen(path, "rb")) == NULL) {
ctx->error(ctx, "%s: %s", path, strerror(errno));
return (-1);
}
pdata = NULL;
psize = 0;
while ((ch = getc(f)) != EOF) {
/* Do not let the server die due to memory exhaustion. */
if ((new_pdata = realloc(pdata, psize + 2)) == NULL) {
ctx->error(ctx, "realloc error: %s", strerror(errno));
goto error;
}
pdata = new_pdata;
pdata[psize++] = ch;
}
if (ferror(f)) {
ctx->error(ctx, "%s: read error", path);
goto error;
}
if (pdata != NULL)
pdata[psize] = '\0';
fclose(f);
limit = options_get_number(&global_options, "buffer-limit");
if (buffer == -1) {
paste_add(&global_buffers, pdata, psize, limit);
return (0);
}
if (paste_replace(&global_buffers, buffer, pdata, psize) != 0) {
ctx->error(ctx, "no buffer %d", buffer);
return (-1);
}
return (0);
error:
if (pdata != NULL)
xfree(pdata);
if (f != NULL)
fclose(f);
return (-1);
}
void
cmd_load_buffer_callback(struct client *c, void *data)
{
int *buffer = data;
char *pdata;
size_t psize;
u_int limit;
/*
* Event callback has already checked client is not dead and reduced
* its reference count. But tell it to exit.
*/
c->flags |= CLIENT_EXIT;
psize = EVBUFFER_LENGTH(c->stdin_event->input);
if (psize == 0 || (pdata = malloc(psize + 1)) == NULL) {
free(data);
return;
}
bufferevent_read(c->stdin_event, pdata, psize);
pdata[psize] = '\0';
limit = options_get_number(&global_options, "buffer-limit");
if (*buffer == -1)
paste_add(&global_buffers, pdata, psize, limit);
else if (paste_replace(&global_buffers, *buffer, pdata, psize) != 0) {
/* No context so can't use server_client_msg_error. */
evbuffer_add_printf(
c->stderr_event->output, "no buffer %d\n", *buffer);
bufferevent_enable(c->stderr_event, EV_WRITE);
}
free (data);
}