1 /* $OpenBSD: cmd-save-buffer.c,v 1.26 2014/10/08 17:35:58 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 NULL, 43 cmd_save_buffer_exec 44 }; 45 46 const struct cmd_entry cmd_show_buffer_entry = { 47 "show-buffer", "showb", 48 "b:", 0, 0, 49 CMD_BUFFER_USAGE, 50 0, 51 NULL, 52 cmd_save_buffer_exec 53 }; 54 55 enum cmd_retval 56 cmd_save_buffer_exec(struct cmd *self, struct cmd_q *cmdq) 57 { 58 struct args *args = self->args; 59 struct client *c = cmdq->client; 60 struct session *s; 61 struct paste_buffer *pb; 62 const char *path, *bufname; 63 char *start, *end, *msg; 64 size_t size, used, msglen; 65 int cwd, fd; 66 FILE *f; 67 68 if (!args_has(args, 'b')) { 69 if ((pb = paste_get_top()) == NULL) { 70 cmdq_error(cmdq, "no buffers"); 71 return (CMD_RETURN_ERROR); 72 } 73 } else { 74 bufname = args_get(args, 'b'); 75 pb = paste_get_name(bufname); 76 if (pb == NULL) { 77 cmdq_error(cmdq, "no buffer %s", bufname); 78 return (CMD_RETURN_ERROR); 79 } 80 } 81 82 if (self->entry == &cmd_show_buffer_entry) 83 path = "-"; 84 else 85 path = args->argv[0]; 86 if (strcmp(path, "-") == 0) { 87 if (c == NULL) { 88 cmdq_error(cmdq, "can't write to stdout"); 89 return (CMD_RETURN_ERROR); 90 } 91 if (c->session == NULL || (c->flags & CLIENT_CONTROL)) 92 goto do_stdout; 93 goto do_print; 94 } 95 96 if (c != NULL && c->session == NULL) 97 cwd = c->cwd; 98 else if ((s = cmd_current_session(cmdq, 0)) != NULL) 99 cwd = s->cwd; 100 else 101 cwd = AT_FDCWD; 102 103 f = NULL; 104 if (args_has(self->args, 'a')) { 105 fd = openat(cwd, path, O_CREAT|O_RDWR|O_APPEND, 0600); 106 if (fd != -1) 107 f = fdopen(fd, "ab"); 108 } else { 109 fd = openat(cwd, path, O_CREAT|O_RDWR|O_TRUNC, 0600); 110 if (fd != -1) 111 f = fdopen(fd, "wb"); 112 } 113 if (f == NULL) { 114 if (fd != -1) 115 close(fd); 116 cmdq_error(cmdq, "%s: %s", path, strerror(errno)); 117 return (CMD_RETURN_ERROR); 118 } 119 if (fwrite(pb->data, 1, pb->size, f) != pb->size) { 120 cmdq_error(cmdq, "%s: fwrite error", path); 121 fclose(f); 122 return (CMD_RETURN_ERROR); 123 } 124 fclose(f); 125 126 return (CMD_RETURN_NORMAL); 127 128 do_stdout: 129 evbuffer_add(c->stdout_data, pb->data, pb->size); 130 server_push_stdout(c); 131 return (CMD_RETURN_NORMAL); 132 133 do_print: 134 if (pb->size > (INT_MAX / 4) - 1) { 135 cmdq_error(cmdq, "buffer too big"); 136 return (CMD_RETURN_ERROR); 137 } 138 msg = NULL; 139 140 used = 0; 141 while (used != pb->size) { 142 start = pb->data + used; 143 end = memchr(start, '\n', pb->size - used); 144 if (end != NULL) 145 size = end - start; 146 else 147 size = pb->size - used; 148 149 msglen = size * 4 + 1; 150 msg = xrealloc(msg, msglen); 151 152 strvisx(msg, start, size, VIS_OCTAL|VIS_TAB); 153 cmdq_print(cmdq, "%s", msg); 154 155 used += size + (end != NULL); 156 } 157 158 free(msg); 159 return (CMD_RETURN_NORMAL); 160 } 161