1 /* $OpenBSD: cmd-save-buffer.c,v 1.43 2017/04/22 06:13:30 nicm Exp $ */ 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 #include <vis.h> 28 29 #include "tmux.h" 30 31 /* 32 * Saves a paste buffer to a file. 33 */ 34 35 static enum cmd_retval cmd_save_buffer_exec(struct cmd *, struct cmdq_item *); 36 37 const struct cmd_entry cmd_save_buffer_entry = { 38 .name = "save-buffer", 39 .alias = "saveb", 40 41 .args = { "ab:", 1, 1 }, 42 .usage = "[-a] " CMD_BUFFER_USAGE " path", 43 44 .flags = CMD_AFTERHOOK, 45 .exec = cmd_save_buffer_exec 46 }; 47 48 const struct cmd_entry cmd_show_buffer_entry = { 49 .name = "show-buffer", 50 .alias = "showb", 51 52 .args = { "b:", 0, 0 }, 53 .usage = CMD_BUFFER_USAGE, 54 55 .flags = CMD_AFTERHOOK, 56 .exec = cmd_save_buffer_exec 57 }; 58 59 static enum cmd_retval 60 cmd_save_buffer_exec(struct cmd *self, struct cmdq_item *item) 61 { 62 struct args *args = self->args; 63 struct client *c = item->client; 64 struct paste_buffer *pb; 65 const char *path, *bufname, *bufdata, *start, *end; 66 const char *flags; 67 char *msg, *file; 68 size_t size, used, msglen, bufsize; 69 FILE *f; 70 71 if (!args_has(args, 'b')) { 72 if ((pb = paste_get_top(NULL)) == NULL) { 73 cmdq_error(item, "no buffers"); 74 return (CMD_RETURN_ERROR); 75 } 76 } else { 77 bufname = args_get(args, 'b'); 78 pb = paste_get_name(bufname); 79 if (pb == NULL) { 80 cmdq_error(item, "no buffer %s", bufname); 81 return (CMD_RETURN_ERROR); 82 } 83 } 84 bufdata = paste_buffer_data(pb, &bufsize); 85 86 if (self->entry == &cmd_show_buffer_entry) 87 path = "-"; 88 else 89 path = args->argv[0]; 90 if (strcmp(path, "-") == 0) { 91 if (c == NULL) { 92 cmdq_error(item, "can't write to stdout"); 93 return (CMD_RETURN_ERROR); 94 } 95 if (c->session == NULL || (c->flags & CLIENT_CONTROL)) 96 goto do_stdout; 97 goto do_print; 98 } 99 100 flags = "wb"; 101 if (args_has(self->args, 'a')) 102 flags = "ab"; 103 104 file = server_client_get_path(c, path); 105 f = fopen(file, flags); 106 if (f == NULL) { 107 cmdq_error(item, "%s: %s", file, strerror(errno)); 108 free(file); 109 return (CMD_RETURN_ERROR); 110 } 111 112 if (fwrite(bufdata, 1, bufsize, f) != bufsize) { 113 cmdq_error(item, "%s: write error", file); 114 fclose(f); 115 free(file); 116 return (CMD_RETURN_ERROR); 117 } 118 119 fclose(f); 120 free(file); 121 122 return (CMD_RETURN_NORMAL); 123 124 do_stdout: 125 evbuffer_add(c->stdout_data, bufdata, bufsize); 126 server_client_push_stdout(c); 127 return (CMD_RETURN_NORMAL); 128 129 do_print: 130 if (bufsize > (INT_MAX / 4) - 1) { 131 cmdq_error(item, "buffer too big"); 132 return (CMD_RETURN_ERROR); 133 } 134 msg = NULL; 135 136 used = 0; 137 while (used != bufsize) { 138 start = bufdata + used; 139 end = memchr(start, '\n', bufsize - used); 140 if (end != NULL) 141 size = end - start; 142 else 143 size = bufsize - used; 144 145 msglen = size * 4 + 1; 146 msg = xrealloc(msg, msglen); 147 148 strvisx(msg, start, size, VIS_OCTAL|VIS_TAB); 149 cmdq_print(item, "%s", msg); 150 151 used += size + (end != NULL); 152 } 153 154 free(msg); 155 return (CMD_RETURN_NORMAL); 156 } 157