1 /* $OpenBSD: cmd-load-buffer.c,v 1.17 2011/05/18 08:07:44 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 21 #include <errno.h> 22 #include <stdio.h> 23 #include <stdlib.h> 24 #include <string.h> 25 #include <unistd.h> 26 27 #include "tmux.h" 28 29 /* 30 * Loads a session paste buffer from a file. 31 */ 32 33 int cmd_load_buffer_exec(struct cmd *, struct cmd_ctx *); 34 void cmd_load_buffer_callback(struct client *, void *); 35 36 const struct cmd_entry cmd_load_buffer_entry = { 37 "load-buffer", "loadb", 38 "b:", 1, 1, 39 CMD_BUFFER_USAGE " path", 40 0, 41 NULL, 42 NULL, 43 cmd_load_buffer_exec 44 }; 45 46 int 47 cmd_load_buffer_exec(struct cmd *self, struct cmd_ctx *ctx) 48 { 49 struct args *args = self->args; 50 struct client *c = ctx->cmdclient; 51 FILE *f; 52 const char *path; 53 char *pdata, *new_pdata, *cause; 54 size_t psize; 55 u_int limit; 56 int ch, buffer; 57 int *buffer_ptr; 58 59 if (!args_has(args, 'b')) 60 buffer = -1; 61 else { 62 buffer = args_strtonum(args, 'b', 0, INT_MAX, &cause); 63 if (cause != NULL) { 64 ctx->error(ctx, "buffer %s", cause); 65 xfree(cause); 66 return (-1); 67 } 68 } 69 70 path = args->argv[0]; 71 if (strcmp(path, "-") == 0) { 72 if (c == NULL) { 73 ctx->error(ctx, "%s: can't read from stdin", path); 74 return (-1); 75 } 76 if (c->flags & CLIENT_TERMINAL) { 77 ctx->error(ctx, "%s: stdin is a tty", path); 78 return (-1); 79 } 80 if (c->stdin_fd == -1) { 81 ctx->error(ctx, "%s: can't read from stdin", path); 82 return (-1); 83 } 84 85 buffer_ptr = xmalloc(sizeof *buffer_ptr); 86 *buffer_ptr = buffer; 87 88 c->stdin_data = buffer_ptr; 89 c->stdin_callback = cmd_load_buffer_callback; 90 91 c->references++; 92 bufferevent_enable(c->stdin_event, EV_READ); 93 return (1); 94 } 95 96 if ((f = fopen(path, "rb")) == NULL) { 97 ctx->error(ctx, "%s: %s", path, strerror(errno)); 98 return (-1); 99 } 100 101 pdata = NULL; 102 psize = 0; 103 while ((ch = getc(f)) != EOF) { 104 /* Do not let the server die due to memory exhaustion. */ 105 if ((new_pdata = realloc(pdata, psize + 2)) == NULL) { 106 ctx->error(ctx, "realloc error: %s", strerror(errno)); 107 goto error; 108 } 109 pdata = new_pdata; 110 pdata[psize++] = ch; 111 } 112 if (ferror(f)) { 113 ctx->error(ctx, "%s: read error", path); 114 goto error; 115 } 116 if (pdata != NULL) 117 pdata[psize] = '\0'; 118 119 fclose(f); 120 121 limit = options_get_number(&global_options, "buffer-limit"); 122 if (buffer == -1) { 123 paste_add(&global_buffers, pdata, psize, limit); 124 return (0); 125 } 126 if (paste_replace(&global_buffers, buffer, pdata, psize) != 0) { 127 ctx->error(ctx, "no buffer %d", buffer); 128 return (-1); 129 } 130 131 return (0); 132 133 error: 134 if (pdata != NULL) 135 xfree(pdata); 136 if (f != NULL) 137 fclose(f); 138 return (-1); 139 } 140 141 void 142 cmd_load_buffer_callback(struct client *c, void *data) 143 { 144 int *buffer = data; 145 char *pdata; 146 size_t psize; 147 u_int limit; 148 149 /* 150 * Event callback has already checked client is not dead and reduced 151 * its reference count. But tell it to exit. 152 */ 153 c->flags |= CLIENT_EXIT; 154 155 psize = EVBUFFER_LENGTH(c->stdin_event->input); 156 if (psize == 0 || (pdata = malloc(psize + 1)) == NULL) { 157 xfree(data); 158 return; 159 } 160 bufferevent_read(c->stdin_event, pdata, psize); 161 pdata[psize] = '\0'; 162 163 limit = options_get_number(&global_options, "buffer-limit"); 164 if (*buffer == -1) 165 paste_add(&global_buffers, pdata, psize, limit); 166 else if (paste_replace(&global_buffers, *buffer, pdata, psize) != 0) { 167 /* No context so can't use server_client_msg_error. */ 168 evbuffer_add_printf( 169 c->stderr_event->output, "no buffer %d\n", *buffer); 170 bufferevent_enable(c->stderr_event, EV_WRITE); 171 } 172 173 xfree(data); 174 } 175