tmux/cmd-load-buffer.c

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/* $Id: cmd-load-buffer.c,v 1.18 2010-12-22 15:28:50 tcunha Exp $ */
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/*
* 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>
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#include <errno.h>
#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#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 *);
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const struct cmd_entry cmd_load_buffer_entry = {
"load-buffer", "loadb",
CMD_BUFFER_SESSION_USAGE " path",
CMD_ARG1, "",
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cmd_buffer_init,
cmd_buffer_parse,
cmd_load_buffer_exec,
cmd_buffer_free,
cmd_buffer_print
};
struct cmd_load_buffer_cdata {
struct session *session;
int buffer;
};
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int
cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx)
{
struct cmd_buffer_data *data = self->data;
struct cmd_load_buffer_cdata *cdata;
struct session *s;
struct client *c = ctx->cmdclient;
FILE *f;
char *pdata, *new_pdata;
size_t psize;
u_int limit;
int ch;
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if ((s = cmd_find_session(ctx, data->target)) == NULL)
return (-1);
if (strcmp(data->arg, "-") == 0) {
if (c == NULL) {
ctx->error(ctx, "%s: can't read from stdin", data->arg);
return (-1);
}
if (c->flags & CLIENT_TERMINAL) {
ctx->error(ctx, "%s: stdin is a tty", data->arg);
return (-1);
}
if (c->stdin_fd == -1) {
ctx->error(ctx, "%s: can't read from stdin", data->arg);
return (-1);
}
cdata = xmalloc(sizeof *cdata);
cdata->session = s;
cdata->session->references++;
cdata->buffer = data->buffer;
c->stdin_data = cdata;
c->stdin_callback = cmd_load_buffer_callback;
c->references++;
bufferevent_enable(c->stdin_event, EV_READ);
return (1);
}
if ((f = fopen(data->arg, "rb")) == NULL) {
ctx->error(ctx, "%s: %s", data->arg, strerror(errno));
return (-1);
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}
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;
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}
if (ferror(f)) {
ctx->error(ctx, "%s: read error", data->arg);
goto error;
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}
if (pdata != NULL)
pdata[psize] = '\0';
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fclose(f);
f = NULL;
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limit = options_get_number(&s->options, "buffer-limit");
if (data->buffer == -1) {
paste_add(&s->buffers, pdata, psize, limit);
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return (0);
}
if (paste_replace(&s->buffers, data->buffer, pdata, psize) != 0) {
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ctx->error(ctx, "no buffer %d", data->buffer);
return (-1);
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}
return (0);
error:
if (pdata != NULL)
xfree(pdata);
if (f != NULL)
fclose(f);
return (-1);
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}
void
cmd_load_buffer_callback(struct client *c, void *data)
{
struct cmd_load_buffer_cdata *cdata = data;
struct session *s = cdata->session;
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;
/* Does the target session still exist? */
if (!session_alive(s))
goto out;
psize = EVBUFFER_LENGTH(c->stdin_event->input);
if (psize == 0)
goto out;
pdata = malloc(psize + 1);
if (pdata == NULL)
goto out;
bufferevent_read(c->stdin_event, pdata, psize);
pdata[psize] = '\0';
limit = options_get_number(&s->options, "buffer-limit");
if (cdata->buffer == -1) {
paste_add(&s->buffers, pdata, psize, limit);
goto out;
}
if (paste_replace(&s->buffers, cdata->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", cdata->buffer);
bufferevent_enable(c->stderr_event, EV_WRITE);
goto out;
}
out:
cdata->session->references--;
xfree(cdata);
}