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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: xcatch.c,v 1.7 1999/05/21 22:09:19 mdw Exp $ |
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4 | * |
5 | * Catch input and trap it in an X window |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the Edgeware X tools collection. |
13 | * |
14 | * X tools is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * X tools is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with X tools; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: xcatch.c,v $ |
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32 | * Revision 1.7 1999/05/21 22:09:19 mdw |
33 | * Take advantage of new dynamic string macros. |
34 | * |
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35 | * Revision 1.6 1999/05/19 20:41:15 mdw |
36 | * Track gratuitous change in mdwopt interface. |
37 | * |
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38 | * Revision 1.5 1999/05/05 18:55:18 mdw |
39 | * Block SIGCHLD around the `fork' call to prevent a race. |
40 | * |
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41 | * Revision 1.4 1999/03/24 22:23:57 mdw |
42 | * Improve display for large files. Keep newly added material in view if |
43 | * scrolled to bottom of window. |
44 | * |
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45 | * Revision 1.3 1998/12/20 17:19:16 mdw |
46 | * Return exit status of child process, rather than always returning |
47 | * success. |
48 | * |
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49 | * Revision 1.2 1998/12/16 00:10:58 mdw |
50 | * Fix tabbing in help text. |
51 | * |
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52 | * Revision 1.1 1998/12/15 23:46:50 mdw |
53 | * New program: captures input and puts it in a window. |
54 | * |
55 | */ |
56 | |
57 | /*----- Header files ------------------------------------------------------*/ |
58 | |
59 | #include <errno.h> |
60 | #include <signal.h> |
61 | #include <stdio.h> |
62 | #include <stdlib.h> |
63 | #include <string.h> |
64 | |
65 | #include <sys/types.h> |
66 | #include <sys/wait.h> |
67 | |
68 | #include <fcntl.h> |
69 | #include <unistd.h> |
70 | |
71 | #include <gtk/gtk.h> |
72 | |
73 | #include <mLib/dstr.h> |
74 | #include <mLib/mdwopt.h> |
75 | #include <mLib/report.h> |
76 | #include <mLib/quis.h> |
77 | |
78 | #include <mgLib/cancel.h> |
79 | #include <mgLib/msg.h> |
80 | |
81 | /*----- Inportant state ---------------------------------------------------*/ |
82 | |
83 | static unsigned int flags; |
84 | |
85 | enum { |
86 | f_closed = 1, |
87 | f_bogus = 2 |
88 | }; |
89 | |
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90 | static GtkWidget *textbox = 0; |
91 | static GdkFont *font; |
92 | |
93 | static pid_t kid = -1; |
94 | static int status; |
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95 | |
96 | /*----- Main code ---------------------------------------------------------*/ |
97 | |
98 | /* --- The window's closed --- */ |
99 | |
100 | static void killwin(GtkWidget *w, gpointer p) |
101 | { |
102 | if (flags & f_closed) |
103 | gtk_main_quit(); |
104 | else |
105 | textbox = 0; |
106 | } |
107 | |
108 | /* --- Some input has arrived --- */ |
109 | |
110 | static void ready(gpointer data, gint fd, GdkInputCondition c) |
111 | { |
112 | char buf[1024]; |
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113 | int doscroll = 1; |
114 | GtkText *t; |
115 | GtkAdjustment *va; |
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116 | |
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117 | /* --- If not ready to read then go away --- */ |
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118 | |
119 | if (!(c & GDK_INPUT_READ)) |
120 | return; |
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121 | |
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122 | /* --- Decide whether to scroll the window --- */ |
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123 | |
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124 | if (textbox) { |
125 | t = GTK_TEXT(textbox); |
126 | va = t->vadj; |
127 | if (va->value + va->page_size < va->upper) |
128 | doscroll = 0; |
129 | gtk_text_freeze(t); |
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130 | } |
131 | |
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132 | /* --- Read data into the buffer --- * |
133 | * |
134 | * This is a bit of a mess. |
135 | */ |
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136 | |
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137 | for (;;) { |
138 | int r = read(fd, buf, sizeof(buf)); |
139 | |
140 | /* --- The read failed --- * |
141 | * |
142 | * Maybe there's no more data to read. In this case, we get |
143 | * @EWOULDBLOCK@, indicating it's time to stop and do something else. |
144 | * Otherwise something serious has happened. |
145 | */ |
146 | |
147 | if (r < 0) { |
148 | if (errno == EWOULDBLOCK) |
149 | break; |
150 | msg(":~OK", "error reading data: %s", strerror(errno)); |
151 | exit(EXIT_FAILURE); |
152 | } |
153 | |
154 | /* --- End of file --- * |
155 | * |
156 | * If the box is closed, then exit quiety; otherwise wait for it to |
157 | * go away. |
158 | */ |
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159 | |
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160 | if (r == 0) { |
161 | close(fd); |
162 | if (textbox) |
163 | flags |= f_closed; |
164 | else |
165 | gtk_main_quit(); |
166 | break; |
167 | } |
168 | |
169 | /* --- If there's no output window, create one --- */ |
170 | |
171 | if (!textbox) { |
172 | GtkWidget *win; |
173 | GtkWidget *tbl; |
174 | GtkWidget *w; |
175 | |
176 | win = gtk_dialog_new(); |
177 | gtk_signal_connect(GTK_OBJECT(win), "destroy", |
178 | GTK_SIGNAL_FUNC(killwin), 0); |
179 | |
180 | tbl = gtk_table_new(2, 2, 0); |
181 | gtk_container_border_width(GTK_CONTAINER(tbl), 8); |
182 | gtk_box_pack_start(GTK_BOX(GTK_DIALOG(win)->vbox), tbl, 1, 1, 0); |
183 | gtk_widget_show(tbl); |
184 | |
185 | textbox = gtk_text_new(0, 0); |
186 | t = GTK_TEXT(textbox); |
187 | va = t->vadj; |
188 | gtk_table_attach(GTK_TABLE(tbl), textbox, 0, 1, 0, 1, |
189 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, |
190 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, |
191 | 0, 0); |
192 | gtk_text_set_editable(t, 0); |
193 | gtk_widget_set_usize(textbox, 500, 300); |
194 | gtk_text_freeze(t); |
195 | gtk_widget_show(textbox); |
196 | |
197 | w = gtk_vscrollbar_new(va); |
198 | gtk_table_attach(GTK_TABLE(tbl), w, 1, 2, 0, 1, |
199 | 0, GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0); |
200 | gtk_widget_show(w); |
201 | |
202 | w = gtk_hscrollbar_new(t->hadj); |
203 | gtk_table_attach(GTK_TABLE(tbl), w, 0, 1, 1, 2, |
204 | GTK_EXPAND | GTK_SHRINK | GTK_FILL, 0, 0, 0); |
205 | gtk_widget_show(w); |
206 | |
207 | gtk_box_set_homogeneous(GTK_BOX(GTK_DIALOG(win)->action_area), 0); |
208 | w = gtk_button_new_with_label("Dismiss"); |
209 | gtk_signal_connect_object(GTK_OBJECT(w), "clicked", |
210 | GTK_SIGNAL_FUNC(gtk_object_destroy), |
211 | GTK_OBJECT(win)); |
212 | gtk_box_pack_end(GTK_BOX(GTK_DIALOG(win)->action_area), w, 0, 0, 0); |
213 | GTK_WIDGET_SET_FLAGS(w, GTK_CAN_DEFAULT); |
214 | gtk_widget_grab_default(w); |
215 | cancel(GTK_WINDOW(win), w); |
216 | gtk_widget_show(w); |
217 | |
218 | gtk_widget_show(win); |
219 | } |
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220 | |
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221 | gtk_text_insert(t, font, 0, 0, buf, r); |
222 | } |
223 | |
224 | if (textbox) { |
225 | gtk_text_thaw(t); |
226 | if (doscroll) |
227 | gtk_adjustment_set_value(va, va->upper - va->page_size); |
228 | } |
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229 | } |
230 | |
231 | /* --- Signal handler --- */ |
232 | |
233 | static void reap(int sig) |
234 | { |
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235 | pid_t k; |
236 | int s; |
237 | |
238 | for (;;) { |
239 | k = waitpid(-1, &s, WNOHANG); |
240 | if (k <= 0) |
241 | break; |
242 | if (k == kid) { |
243 | if (WIFEXITED(s)) |
244 | status = WEXITSTATUS(s); |
245 | else |
246 | status = 127; |
247 | } |
248 | } |
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249 | } |
250 | |
251 | /* --- Main program --- */ |
252 | |
253 | static void version(FILE *fp) |
254 | { |
255 | fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS); |
256 | } |
257 | |
258 | static void usage(FILE *fp) |
259 | { |
260 | fprintf(fp, "Usage: %s [-f file] [-F font] [command [args...]]\n", QUIS); |
261 | } |
262 | |
263 | int main(int argc, char *argv[]) |
264 | { |
265 | int fd = -1; |
266 | |
267 | ego(argv[0]); |
268 | |
269 | gtk_init(&argc, &argv); |
270 | |
271 | for (;;) { |
272 | static struct option opt[] = { |
273 | { "help", 0, 0, 'h' }, |
274 | { "usage", 0, 0, 'u' }, |
275 | { "version", 0, 0, 'v' }, |
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276 | { "file", OPTF_ARGREQ, 0, 'f' }, |
277 | { "font", OPTF_ARGREQ, 0, 'F' }, |
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278 | { 0, 0, 0, 0 } |
279 | }; |
280 | int i = mdwopt(argc, argv, "huvf:F:", opt, 0, 0, 0); |
281 | |
282 | if (i < 0) |
283 | break; |
284 | |
285 | switch (i) { |
286 | case 'h': |
287 | version(stdout); |
288 | fputc('\n', stdout); |
289 | usage(stdout); |
290 | fputs( |
291 | "\n" |
292 | "Catches input from a pipe or other source, and captures it in a window.\n" |
293 | "Nothing is displayed if there's no input.\n" |
294 | "\n" |
295 | "Options provided:\n" |
296 | "\n" |
297 | "-h, --help Display this help text\n" |
298 | "-u, --usage Display a quick usage summary\n" |
299 | "-v, --version Display the version number\n" |
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300 | "-f, --file=FILE\t Read input from the named file\n" |
301 | "-F, --font=FONT\t Display output in the named font\n", |
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302 | stdout); |
303 | exit(0); |
304 | break; |
305 | case 'u': |
306 | usage(stdout); |
307 | exit(0); |
308 | break; |
309 | case 'v': |
310 | version(stdout); |
311 | exit(0); |
312 | break; |
313 | case 'f': |
314 | if ((fd = open(optarg, O_RDONLY)) < 0) { |
315 | die(1, "couldn't open file: %s", strerror(errno)); |
316 | exit(1); |
317 | } |
318 | break; |
319 | case 'F': |
320 | font = gdk_font_load(optarg); |
321 | break; |
322 | default: |
323 | flags |= f_bogus; |
324 | break; |
325 | } |
326 | } |
327 | |
328 | if (flags & f_bogus) { |
329 | usage(stderr); |
330 | exit(1); |
331 | } |
332 | |
333 | if (fd == -1) { |
334 | if (optind == argc) |
335 | fd = STDIN_FILENO; |
336 | else { |
337 | int pfd[2]; |
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338 | struct sigaction sa; |
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339 | sigset_t newmask, oldmask; |
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340 | |
341 | /* --- Set up a signal handler --- */ |
342 | |
343 | sa.sa_handler = reap; |
344 | sigemptyset(&sa.sa_mask); |
345 | sa.sa_flags = 0; |
346 | sigaction(SIGCHLD, &sa, 0); |
347 | |
348 | /* --- Start a child program --- */ |
349 | |
350 | if (pipe(pfd)) |
351 | die(1, "couldn't open pipe: %s", strerror(errno)); |
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352 | |
353 | sigemptyset(&newmask); |
354 | sigaddset(&newmask, SIGCHLD); |
355 | sigprocmask(SIG_BLOCK, &newmask, &oldmask); |
356 | |
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357 | kid = fork(); |
358 | if (kid < 0) |
359 | die(1, "couldn't fork: %s", strerror(errno)); |
360 | if (kid == 0) { |
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361 | dstr d = DSTR_INIT; |
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362 | |
363 | close(pfd[0]); |
364 | if (pfd[1] != STDOUT_FILENO) |
365 | dup2(pfd[1], STDOUT_FILENO); |
366 | if (pfd[1] != STDERR_FILENO) |
367 | dup2(pfd[1], STDERR_FILENO); |
368 | if (pfd[1] != STDOUT_FILENO && pfd[1] != STDERR_FILENO) |
369 | close(pfd[1]); |
370 | execvp(argv[optind], argv + optind); |
371 | |
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372 | dstr_putf(&d, "%s: couldn't run `%s': %s\n", |
373 | QUIS, argv[optind], strerror(errno)); |
374 | write(STDERR_FILENO, d.buf, d.len); |
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375 | dstr_destroy(&d); |
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376 | _exit(127); |
377 | } |
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378 | |
379 | sigprocmask(SIG_SETMASK, &oldmask, 0); |
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380 | fd = pfd[0]; |
381 | close(pfd[1]); |
382 | } |
383 | } |
384 | |
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385 | { |
386 | int f = fcntl(fd, F_GETFL); |
387 | fcntl(fd, F_SETFL, f | O_NONBLOCK); |
388 | } |
389 | |
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390 | gdk_input_add(fd, GDK_INPUT_READ, ready, 0); |
391 | gtk_main(); |
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392 | return (status); |
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393 | } |
394 | |
395 | /*----- That's all, folks -------------------------------------------------*/ |