aboutsummaryrefslogtreecommitdiff
path: root/util.c
blob: 052d535a108fbdc866929cfdd736263f7df5e3db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
/*
 * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
 * See LICENSE file for license details.
 */

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <X11/Xatom.h>

#include "util.h"

static char *shell = NULL;

void
error(char *errstr, ...) {
	va_list ap;
	va_start(ap, errstr);
	vfprintf(stderr, errstr, ap);
	va_end(ap);
	exit(1);
}

static void
bad_malloc(unsigned int size)
{
	fprintf(stderr, "fatal: could not malloc() %d bytes\n",
			(int) size);
	exit(1);
}

void *
emallocz(unsigned int size)
{
	void *res = calloc(1, size);
	if(!res)
		bad_malloc(size);
	return res;
}

void *
emalloc(unsigned int size)
{
	void *res = malloc(size);
	if(!res)
		bad_malloc(size);
	return res;
}

void *
erealloc(void *ptr, unsigned int size)
{
	void *res = realloc(ptr, size);
	if(!res)
		bad_malloc(size);
	return res;
}

char *
estrdup(const char *str)
{
	void *res = strdup(str);
	if(!res)
		bad_malloc(strlen(str));
	return res;
}

void
failed_assert(char *a, char *file, int line)
{
	fprintf(stderr, "Assertion \"%s\" failed at %s:%d\n", a, file, line);
	abort();
}

void
swap(void **p1, void **p2)
{
	void *tmp = *p1;
	*p1 = *p2;
	*p2 = tmp;
}

void
spawn(Display *dpy, const char *cmd)
{
	if(!shell && !(shell = getenv("SHELL")))
		shell = "/bin/sh";

	if(!cmd)
		return;
	if(fork() == 0) {
		if(fork() == 0) {
			if(dpy)
				close(ConnectionNumber(dpy));
			setsid();
			fprintf(stderr, "gridwm: execlp %s %s -c %s", shell, shell, cmd);
			execlp(shell, shell, "-c", cmd, NULL);
			fprintf(stderr, "gridwm: execlp %s", cmd);
			perror(" failed");
		}
		exit (0);
	}
	wait(0);
}

void
pipe_spawn(char *buf, unsigned int len, Display *dpy, const char *cmd)
{
	unsigned int l, n;
	int pfd[2];

	if(!shell && !(shell = getenv("SHELL")))
		shell = "/bin/sh";

	if(!cmd)
		return;

	if(pipe(pfd) == -1) {
		perror("pipe");
		exit(1);
	}

	if(fork() == 0) {
		if(dpy)
			close(ConnectionNumber(dpy));
		setsid();
		dup2(pfd[1], STDOUT_FILENO);
		close(pfd[0]);
		close(pfd[1]);
		execlp(shell, shell, "-c", cmd, NULL);
		fprintf(stderr, "gridwm: execlp %s", cmd);
		perror(" failed");
	}
	else {
		n = 0;
		close(pfd[1]);
		while(l > n) {
			if((l = read(pfd[0], buf + n, len - n)) < 1)
				break;
			n += l;
		}
		close(pfd[0]);
		buf[n - 1] = 0;
	}
	wait(0);
}


unsigned char *
getselection(unsigned long offset, unsigned long *len, unsigned long *remain)
{
	Display *dpy;
	Atom xa_clip_string;
	Window w;
	XEvent ev;
	Atom typeret;
	int format;
	unsigned char *data;
	unsigned char *result = NULL;

	dpy = XOpenDisplay(0);
	if(!dpy)
		return NULL;
	xa_clip_string = XInternAtom(dpy, "_SEL_STRING", False);
	w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 10, 10, 200, 200,
			1, CopyFromParent, CopyFromParent);
	XConvertSelection(dpy, XA_PRIMARY, XA_STRING, xa_clip_string,
			w, CurrentTime);
	XFlush(dpy);
	XNextEvent(dpy, &ev);
	if(ev.type == SelectionNotify && ev.xselection.property != None) {
		XGetWindowProperty(dpy, w, ev.xselection.property, offset, 4096L, False,
				AnyPropertyType, &typeret, &format, len, remain, &data);
		if(*len) {
			result = emalloc(sizeof(unsigned char) * *len);
			memcpy(result, data, *len);
		}
		XDeleteProperty(dpy, w, ev.xselection.property);
	}
	XDestroyWindow(dpy, w);
	XCloseDisplay(dpy);
	return result;
}