dwm-meillo

view util.c @ 12:a2b399582afe

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new stuff
author Anselm R. Garbe <garbeam@wmii.de>
date Tue, 11 Jul 2006 14:53:22 +0200
parents d567f430a81d
children 5c078b66347b
line source
1 /*
2 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
3 * See LICENSE file for license details.
4 */
5
6 #include <stdarg.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <sys/types.h>
11 #include <sys/wait.h>
12 #include <unistd.h>
13 #include <X11/Xatom.h>
14
15 #include "util.h"
16
17 static char *shell = NULL;
18
19 void
20 error(char *errstr, ...) {
21 va_list ap;
22 va_start(ap, errstr);
23 vfprintf(stderr, errstr, ap);
24 va_end(ap);
25 exit(1);
26 }
27
28 static void
29 bad_malloc(unsigned int size)
30 {
31 fprintf(stderr, "fatal: could not malloc() %d bytes\n",
32 (int) size);
33 exit(1);
34 }
35
36 void *
37 emallocz(unsigned int size)
38 {
39 void *res = calloc(1, size);
40 if(!res)
41 bad_malloc(size);
42 return res;
43 }
44
45 void *
46 emalloc(unsigned int size)
47 {
48 void *res = malloc(size);
49 if(!res)
50 bad_malloc(size);
51 return res;
52 }
53
54 void *
55 erealloc(void *ptr, unsigned int size)
56 {
57 void *res = realloc(ptr, size);
58 if(!res)
59 bad_malloc(size);
60 return res;
61 }
62
63 char *
64 estrdup(const char *str)
65 {
66 void *res = strdup(str);
67 if(!res)
68 bad_malloc(strlen(str));
69 return res;
70 }
71
72 void
73 failed_assert(char *a, char *file, int line)
74 {
75 fprintf(stderr, "Assertion \"%s\" failed at %s:%d\n", a, file, line);
76 abort();
77 }
78
79 void
80 swap(void **p1, void **p2)
81 {
82 void *tmp = *p1;
83 *p1 = *p2;
84 *p2 = tmp;
85 }
86
87 void
88 spawn(Display *dpy, const char *cmd)
89 {
90 if(!shell && !(shell = getenv("SHELL")))
91 shell = "/bin/sh";
92
93 if(!cmd)
94 return;
95 if(fork() == 0) {
96 if(fork() == 0) {
97 if(dpy)
98 close(ConnectionNumber(dpy));
99 setsid();
100 fprintf(stderr, "gridwm: execlp %s %s -c %s", shell, shell, cmd);
101 execlp(shell, shell, "-c", cmd, NULL);
102 fprintf(stderr, "gridwm: execlp %s", cmd);
103 perror(" failed");
104 }
105 exit (0);
106 }
107 wait(0);
108 }
109
110 void
111 pipe_spawn(char *buf, unsigned int len, Display *dpy, const char *cmd)
112 {
113 unsigned int l, n;
114 int pfd[2];
115
116 if(!shell && !(shell = getenv("SHELL")))
117 shell = "/bin/sh";
118
119 if(!cmd)
120 return;
121
122 if(pipe(pfd) == -1) {
123 perror("pipe");
124 exit(1);
125 }
126
127 if(fork() == 0) {
128 if(dpy)
129 close(ConnectionNumber(dpy));
130 setsid();
131 dup2(pfd[1], STDOUT_FILENO);
132 close(pfd[0]);
133 close(pfd[1]);
134 execlp(shell, shell, "-c", cmd, NULL);
135 fprintf(stderr, "gridwm: execlp %s", cmd);
136 perror(" failed");
137 }
138 else {
139 n = 0;
140 close(pfd[1]);
141 while(l > n) {
142 if((l = read(pfd[0], buf + n, len - n)) < 1)
143 break;
144 n += l;
145 }
146 close(pfd[0]);
147 buf[n - 1] = 0;
148 }
149 wait(0);
150 }
151
152
153 unsigned char *
154 getselection(unsigned long offset, unsigned long *len, unsigned long *remain)
155 {
156 Display *dpy;
157 Atom xa_clip_string;
158 Window w;
159 XEvent ev;
160 Atom typeret;
161 int format;
162 unsigned char *data;
163 unsigned char *result = NULL;
164
165 dpy = XOpenDisplay(0);
166 if(!dpy)
167 return NULL;
168 xa_clip_string = XInternAtom(dpy, "_SEL_STRING", False);
169 w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 10, 10, 200, 200,
170 1, CopyFromParent, CopyFromParent);
171 XConvertSelection(dpy, XA_PRIMARY, XA_STRING, xa_clip_string,
172 w, CurrentTime);
173 XFlush(dpy);
174 XNextEvent(dpy, &ev);
175 if(ev.type == SelectionNotify && ev.xselection.property != None) {
176 XGetWindowProperty(dpy, w, ev.xselection.property, offset, 4096L, False,
177 AnyPropertyType, &typeret, &format, len, remain, &data);
178 if(*len) {
179 result = emalloc(sizeof(unsigned char) * *len);
180 memcpy(result, data, *len);
181 }
182 XDeleteProperty(dpy, w, ev.xselection.property);
183 }
184 XDestroyWindow(dpy, w);
185 XCloseDisplay(dpy);
186 return result;
187 }