1 /* $OpenBSD: cmd-save-buffer.c,v 1.35 2015/12/13 14:32:38 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 enum cmd_retval cmd_save_buffer_exec(struct cmd *, struct cmd_q *); 36 37 const struct cmd_entry cmd_save_buffer_entry = { 38 "save-buffer", "saveb", 39 "ab:", 1, 1, 40 "[-a] " CMD_BUFFER_USAGE " path", 41 0, 42 cmd_save_buffer_exec 43 }; 44 45 const struct cmd_entry cmd_show_buffer_entry = { 46 "show-buffer", "showb", 47 "b:", 0, 0, 48 CMD_BUFFER_USAGE, 49 0, 50 cmd_save_buffer_exec 51 }; 52 53 enum cmd_retval 54 cmd_save_buffer_exec(struct cmd *self, struct cmd_q *cmdq) 55 { 56 struct args *args = self->args; 57 struct client *c = cmdq->client; 58 struct session *s; 59 struct paste_buffer *pb; 60 const char *path, *bufname, *bufdata, *start, *end, *cwd; 61 const char *flags; 62 char *msg, *file, resolved[PATH_MAX]; 63 size_t size, used, msglen, bufsize; 64 FILE *f; 65 66 if (!args_has(args, 'b')) { 67 if ((pb = paste_get_top(NULL)) == NULL) { 68 cmdq_error(cmdq, "no buffers"); 69 return (CMD_RETURN_ERROR); 70 } 71 } else { 72 bufname = args_get(args, 'b'); 73 pb = paste_get_name(bufname); 74 if (pb == NULL) { 75 cmdq_error(cmdq, "no buffer %s", bufname); 76 return (CMD_RETURN_ERROR); 77 } 78 } 79 bufdata = paste_buffer_data(pb, &bufsize); 80 81 if (self->entry == &cmd_show_buffer_entry) 82 path = "-"; 83 else 84 path = args->argv[0]; 85 if (strcmp(path, "-") == 0) { 86 if (c == NULL) { 87 cmdq_error(cmdq, "can't write to stdout"); 88 return (CMD_RETURN_ERROR); 89 } 90 if (c->session == NULL || (c->flags & CLIENT_CONTROL)) 91 goto do_stdout; 92 goto do_print; 93 } 94 95 if (c != NULL && c->session == NULL) 96 cwd = c->cwd; 97 else if ((s = c->session) != NULL) 98 cwd = s->cwd; 99 else 100 cwd = "."; 101 102 flags = "wb"; 103 if (args_has(self->args, 'a')) 104 flags = "ab"; 105 106 if (*path == '/') 107 file = xstrdup(path); 108 else 109 xasprintf(&file, "%s/%s", cwd, path); 110 if (realpath(file, resolved) == NULL && 111 strlcpy(resolved, file, sizeof resolved) >= sizeof resolved) { 112 cmdq_error(cmdq, "%s: %s", file, strerror(ENAMETOOLONG)); 113 return (CMD_RETURN_ERROR); 114 } 115 f = fopen(resolved, flags); 116 free(file); 117 if (f == NULL) { 118 cmdq_error(cmdq, "%s: %s", resolved, strerror(errno)); 119 return (CMD_RETURN_ERROR); 120 } 121 122 if (fwrite(bufdata, 1, bufsize, f) != bufsize) { 123 cmdq_error(cmdq, "%s: write error", resolved); 124 fclose(f); 125 return (CMD_RETURN_ERROR); 126 } 127 fclose(f); 128 129 return (CMD_RETURN_NORMAL); 130 131 do_stdout: 132 evbuffer_add(c->stdout_data, bufdata, bufsize); 133 server_client_push_stdout(c); 134 return (CMD_RETURN_NORMAL); 135 136 do_print: 137 if (bufsize > (INT_MAX / 4) - 1) { 138 cmdq_error(cmdq, "buffer too big"); 139 return (CMD_RETURN_ERROR); 140 } 141 msg = NULL; 142 143 used = 0; 144 while (used != bufsize) { 145 start = bufdata + used; 146 end = memchr(start, '\n', bufsize - used); 147 if (end != NULL) 148 size = end - start; 149 else 150 size = bufsize - used; 151 152 msglen = size * 4 + 1; 153 msg = xrealloc(msg, msglen); 154 155 strvisx(msg, start, size, VIS_OCTAL|VIS_TAB); 156 cmdq_print(cmdq, "%s", msg); 157 158 used += size + (end != NULL); 159 } 160 161 free(msg); 162 return (CMD_RETURN_NORMAL); 163 } 164