1 /* $OpenBSD: cmd-save-buffer.c,v 1.37 2016/03/05 07:47:52 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 .name = "save-buffer", 39 .alias = "saveb", 40 41 .args = { "ab:", 1, 1 }, 42 .usage = "[-a] " CMD_BUFFER_USAGE " path", 43 44 .flags = 0, 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 = 0, 56 .exec = cmd_save_buffer_exec 57 }; 58 59 enum cmd_retval 60 cmd_save_buffer_exec(struct cmd *self, struct cmd_q *cmdq) 61 { 62 struct args *args = self->args; 63 struct client *c = cmdq->client; 64 struct session *s; 65 struct paste_buffer *pb; 66 const char *path, *bufname, *bufdata, *start, *end, *cwd; 67 const char *flags; 68 char *msg, *file, resolved[PATH_MAX]; 69 size_t size, used, msglen, bufsize; 70 FILE *f; 71 72 if (!args_has(args, 'b')) { 73 if ((pb = paste_get_top(NULL)) == NULL) { 74 cmdq_error(cmdq, "no buffers"); 75 return (CMD_RETURN_ERROR); 76 } 77 } else { 78 bufname = args_get(args, 'b'); 79 pb = paste_get_name(bufname); 80 if (pb == NULL) { 81 cmdq_error(cmdq, "no buffer %s", bufname); 82 return (CMD_RETURN_ERROR); 83 } 84 } 85 bufdata = paste_buffer_data(pb, &bufsize); 86 87 if (self->entry == &cmd_show_buffer_entry) 88 path = "-"; 89 else 90 path = args->argv[0]; 91 if (strcmp(path, "-") == 0) { 92 if (c == NULL) { 93 cmdq_error(cmdq, "can't write to stdout"); 94 return (CMD_RETURN_ERROR); 95 } 96 if (c->session == NULL || (c->flags & CLIENT_CONTROL)) 97 goto do_stdout; 98 goto do_print; 99 } 100 101 if (c != NULL && c->session == NULL && c->cwd != NULL) 102 cwd = c->cwd; 103 else if ((s = c->session) != NULL && s->cwd != NULL) 104 cwd = s->cwd; 105 else 106 cwd = "."; 107 108 flags = "wb"; 109 if (args_has(self->args, 'a')) 110 flags = "ab"; 111 112 if (*path == '/') 113 file = xstrdup(path); 114 else 115 xasprintf(&file, "%s/%s", cwd, path); 116 if (realpath(file, resolved) == NULL && 117 strlcpy(resolved, file, sizeof resolved) >= sizeof resolved) { 118 cmdq_error(cmdq, "%s: %s", file, strerror(ENAMETOOLONG)); 119 return (CMD_RETURN_ERROR); 120 } 121 f = fopen(resolved, flags); 122 free(file); 123 if (f == NULL) { 124 cmdq_error(cmdq, "%s: %s", resolved, strerror(errno)); 125 return (CMD_RETURN_ERROR); 126 } 127 128 if (fwrite(bufdata, 1, bufsize, f) != bufsize) { 129 cmdq_error(cmdq, "%s: write error", resolved); 130 fclose(f); 131 return (CMD_RETURN_ERROR); 132 } 133 fclose(f); 134 135 return (CMD_RETURN_NORMAL); 136 137 do_stdout: 138 evbuffer_add(c->stdout_data, bufdata, bufsize); 139 server_client_push_stdout(c); 140 return (CMD_RETURN_NORMAL); 141 142 do_print: 143 if (bufsize > (INT_MAX / 4) - 1) { 144 cmdq_error(cmdq, "buffer too big"); 145 return (CMD_RETURN_ERROR); 146 } 147 msg = NULL; 148 149 used = 0; 150 while (used != bufsize) { 151 start = bufdata + used; 152 end = memchr(start, '\n', bufsize - used); 153 if (end != NULL) 154 size = end - start; 155 else 156 size = bufsize - used; 157 158 msglen = size * 4 + 1; 159 msg = xrealloc(msg, msglen); 160 161 strvisx(msg, start, size, VIS_OCTAL|VIS_TAB); 162 cmdq_print(cmdq, "%s", msg); 163 164 used += size + (end != NULL); 165 } 166 167 free(msg); 168 return (CMD_RETURN_NORMAL); 169 } 170