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Annotation of embedaddon/tmux/cmd-save-buffer.c, revision 1.1

1.1     ! misho       1: /* $OpenBSD$ */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 2009 Tiago Cunha <me@tiagocunha.org>
        !             5:  *
        !             6:  * Permission to use, copy, modify, and distribute this software for any
        !             7:  * purpose with or without fee is hereby granted, provided that the above
        !             8:  * copyright notice and this permission notice appear in all copies.
        !             9:  *
        !            10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            14:  * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
        !            15:  * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
        !            16:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            17:  */
        !            18: 
        !            19: #include <sys/types.h>
        !            20: #include <sys/stat.h>
        !            21: 
        !            22: #include <errno.h>
        !            23: #include <fcntl.h>
        !            24: #include <stdlib.h>
        !            25: #include <string.h>
        !            26: #include <unistd.h>
        !            27: 
        !            28: #include "tmux.h"
        !            29: 
        !            30: /*
        !            31:  * Saves a paste buffer to a file.
        !            32:  */
        !            33: 
        !            34: static enum cmd_retval cmd_save_buffer_exec(struct cmd *, struct cmdq_item *);
        !            35: 
        !            36: const struct cmd_entry cmd_save_buffer_entry = {
        !            37:        .name = "save-buffer",
        !            38:        .alias = "saveb",
        !            39: 
        !            40:        .args = { "ab:", 1, 1 },
        !            41:        .usage = "[-a] " CMD_BUFFER_USAGE " path",
        !            42: 
        !            43:        .flags = CMD_AFTERHOOK,
        !            44:        .exec = cmd_save_buffer_exec
        !            45: };
        !            46: 
        !            47: const struct cmd_entry cmd_show_buffer_entry = {
        !            48:        .name = "show-buffer",
        !            49:        .alias = "showb",
        !            50: 
        !            51:        .args = { "b:", 0, 0 },
        !            52:        .usage = CMD_BUFFER_USAGE,
        !            53: 
        !            54:        .flags = CMD_AFTERHOOK,
        !            55:        .exec = cmd_save_buffer_exec
        !            56: };
        !            57: 
        !            58: static enum cmd_retval
        !            59: cmd_save_buffer_exec(struct cmd *self, struct cmdq_item *item)
        !            60: {
        !            61:        struct args             *args = self->args;
        !            62:        struct client           *c = item->client;
        !            63:        struct paste_buffer     *pb;
        !            64:        const char              *path, *bufname, *bufdata, *start, *end;
        !            65:        const char              *flags;
        !            66:        char                    *msg, *file;
        !            67:        size_t                   size, used, msglen, bufsize;
        !            68:        FILE                    *f;
        !            69: 
        !            70:        if (!args_has(args, 'b')) {
        !            71:                if ((pb = paste_get_top(NULL)) == NULL) {
        !            72:                        cmdq_error(item, "no buffers");
        !            73:                        return (CMD_RETURN_ERROR);
        !            74:                }
        !            75:        } else {
        !            76:                bufname = args_get(args, 'b');
        !            77:                pb = paste_get_name(bufname);
        !            78:                if (pb == NULL) {
        !            79:                        cmdq_error(item, "no buffer %s", bufname);
        !            80:                        return (CMD_RETURN_ERROR);
        !            81:                }
        !            82:        }
        !            83:        bufdata = paste_buffer_data(pb, &bufsize);
        !            84: 
        !            85:        if (self->entry == &cmd_show_buffer_entry)
        !            86:                path = "-";
        !            87:        else
        !            88:                path = args->argv[0];
        !            89:        if (strcmp(path, "-") == 0) {
        !            90:                if (c == NULL) {
        !            91:                        cmdq_error(item, "can't write to stdout");
        !            92:                        return (CMD_RETURN_ERROR);
        !            93:                }
        !            94:                if (c->session == NULL || (c->flags & CLIENT_CONTROL))
        !            95:                        goto do_stdout;
        !            96:                goto do_print;
        !            97:        }
        !            98: 
        !            99:        flags = "wb";
        !           100:        if (args_has(self->args, 'a'))
        !           101:                flags = "ab";
        !           102: 
        !           103:        file = server_client_get_path(c, path);
        !           104:        f = fopen(file, flags);
        !           105:        if (f == NULL) {
        !           106:                cmdq_error(item, "%s: %s", file, strerror(errno));
        !           107:                free(file);
        !           108:                return (CMD_RETURN_ERROR);
        !           109:        }
        !           110: 
        !           111:        if (fwrite(bufdata, 1, bufsize, f) != bufsize) {
        !           112:                cmdq_error(item, "%s: write error", file);
        !           113:                fclose(f);
        !           114:                return (CMD_RETURN_ERROR);
        !           115:        }
        !           116: 
        !           117:        fclose(f);
        !           118:        free(file);
        !           119: 
        !           120:        return (CMD_RETURN_NORMAL);
        !           121: 
        !           122: do_stdout:
        !           123:        evbuffer_add(c->stdout_data, bufdata, bufsize);
        !           124:        server_client_push_stdout(c);
        !           125:        return (CMD_RETURN_NORMAL);
        !           126: 
        !           127: do_print:
        !           128:        if (bufsize > (INT_MAX / 4) - 1) {
        !           129:                cmdq_error(item, "buffer too big");
        !           130:                return (CMD_RETURN_ERROR);
        !           131:        }
        !           132:        msg = NULL;
        !           133: 
        !           134:        used = 0;
        !           135:        while (used != bufsize) {
        !           136:                start = bufdata + used;
        !           137:                end = memchr(start, '\n', bufsize - used);
        !           138:                if (end != NULL)
        !           139:                        size = end - start;
        !           140:                else
        !           141:                        size = bufsize - used;
        !           142: 
        !           143:                msglen = size * 4 + 1;
        !           144:                msg = xrealloc(msg, msglen);
        !           145: 
        !           146:                strvisx(msg, start, size, VIS_OCTAL|VIS_TAB);
        !           147:                cmdq_print(item, "%s", msg);
        !           148: 
        !           149:                used += size + (end != NULL);
        !           150:        }
        !           151: 
        !           152:        free(msg);
        !           153:        return (CMD_RETURN_NORMAL);
        !           154: }