1 /* $OpenBSD: cmd-save-buffer.c,v 1.22 2014/04/07 10:32:16 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; 63 char *cause, *start, *end, *msg; 64 size_t size, used, msglen; 65 int cwd, fd, buffer; 66 FILE *f; 67 68 if (!args_has(args, 'b')) { 69 if ((pb = paste_get_top(&global_buffers)) == NULL) { 70 cmdq_error(cmdq, "no buffers"); 71 return (CMD_RETURN_ERROR); 72 } 73 } else { 74 buffer = args_strtonum(args, 'b', 0, INT_MAX, &cause); 75 if (cause != NULL) { 76 cmdq_error(cmdq, "buffer %s", cause); 77 free(cause); 78 return (CMD_RETURN_ERROR); 79 } 80 81 pb = paste_get_index(&global_buffers, buffer); 82 if (pb == NULL) { 83 cmdq_error(cmdq, "no buffer %d", buffer); 84 return (CMD_RETURN_ERROR); 85 } 86 } 87 88 if (self->entry == &cmd_show_buffer_entry) 89 path = "-"; 90 else 91 path = args->argv[0]; 92 if (strcmp(path, "-") == 0) { 93 if (c == NULL) { 94 cmdq_error(cmdq, "can't write to stdout"); 95 return (CMD_RETURN_ERROR); 96 } 97 if (c->session == NULL || (c->flags & CLIENT_CONTROL)) 98 goto do_stdout; 99 goto do_print; 100 } 101 102 if (c != NULL && c->session == NULL) 103 cwd = c->cwd; 104 else if ((s = cmd_current_session(cmdq, 0)) != NULL) 105 cwd = s->cwd; 106 else 107 cwd = AT_FDCWD; 108 109 f = NULL; 110 if (args_has(self->args, 'a')) { 111 fd = openat(cwd, path, O_CREAT|O_RDWR|O_APPEND, 0600); 112 if (fd != -1) 113 f = fdopen(fd, "ab"); 114 } else { 115 fd = openat(cwd, path, O_CREAT|O_RDWR|O_TRUNC, 0600); 116 if (fd != -1) 117 f = fdopen(fd, "wb"); 118 } 119 if (f == NULL) { 120 if (fd != -1) 121 close(fd); 122 cmdq_error(cmdq, "%s: %s", path, strerror(errno)); 123 return (CMD_RETURN_ERROR); 124 } 125 if (fwrite(pb->data, 1, pb->size, f) != pb->size) { 126 cmdq_error(cmdq, "%s: fwrite error", path); 127 fclose(f); 128 return (CMD_RETURN_ERROR); 129 } 130 fclose(f); 131 132 return (CMD_RETURN_NORMAL); 133 134 do_stdout: 135 evbuffer_add(c->stdout_data, pb->data, pb->size); 136 server_push_stdout(c); 137 return (CMD_RETURN_NORMAL); 138 139 do_print: 140 if (pb->size > (INT_MAX / 4) - 1) { 141 cmdq_error(cmdq, "buffer too big"); 142 return (CMD_RETURN_ERROR); 143 } 144 msg = NULL; 145 msglen = 0; 146 147 used = 0; 148 while (used != pb->size) { 149 start = pb->data + used; 150 end = memchr(start, '\n', pb->size - used); 151 if (end != NULL) 152 size = end - start; 153 else 154 size = pb->size - used; 155 156 msglen = size * 4 + 1; 157 msg = xrealloc(msg, 1, msglen); 158 159 strvisx(msg, start, size, VIS_OCTAL|VIS_TAB); 160 cmdq_print(cmdq, "%s", msg); 161 162 used += size + (end != NULL); 163 } 164 165 free(msg); 166 return (CMD_RETURN_NORMAL); 167 } 168