JasonWoof Got questions, comments, patches, etc.? Contact Jason Woofenden
several changes, new stuff
[dwm.git] / util.c
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
14 #include "util.h"
15
16 void
17 error(char *errstr, ...) {
18         va_list ap;
19         va_start(ap, errstr);
20         vfprintf(stderr, errstr, ap);
21         va_end(ap);
22         exit(1);
23 }
24
25 static void
26 bad_malloc(unsigned int size)
27 {
28         fprintf(stderr, "fatal: could not malloc() %d bytes\n",
29                         (int) size);
30         exit(1);
31 }
32
33 void *
34 emallocz(unsigned int size)
35 {
36         void *res = calloc(1, size);
37         if(!res)
38                 bad_malloc(size);
39         return res;
40 }
41
42 void *
43 emalloc(unsigned int size)
44 {
45         void *res = malloc(size);
46         if(!res)
47                 bad_malloc(size);
48         return res;
49 }
50
51 void *
52 erealloc(void *ptr, unsigned int size)
53 {
54         void *res = realloc(ptr, size);
55         if(!res)
56                 bad_malloc(size);
57         return res;
58 }
59
60 char *
61 estrdup(const char *str)
62 {
63         void *res = strdup(str);
64         if(!res)
65                 bad_malloc(strlen(str));
66         return res;
67 }
68
69 void
70 failed_assert(char *a, char *file, int line)
71 {
72         fprintf(stderr, "Assertion \"%s\" failed at %s:%d\n", a, file, line);
73         abort();
74 }
75
76 void
77 swap(void **p1, void **p2)
78 {
79         void *tmp = *p1;
80         *p1 = *p2;
81         *p2 = tmp;
82 }
83
84 void
85 spawn(Display *dpy, char *argv[])
86 {
87         if(!argv || !argv[0])
88                 return;
89         if(fork() == 0) {
90                 if(fork() == 0) {
91                         if(dpy)
92                                 close(ConnectionNumber(dpy));
93                         setsid();
94                         execvp(argv[0], argv);
95                         fprintf(stderr, "gridwm: execvp %s", argv[0]);
96                         perror(" failed");
97                 }
98                 exit (0);
99         }
100         wait(0);
101 }
102
103 void
104 pipe_spawn(char *buf, unsigned int len, Display *dpy, char *argv[])
105 {
106         unsigned int l, n;
107         int pfd[2];
108
109         if(!argv || !argv[0])
110                 return;
111
112         if(pipe(pfd) == -1) {
113                 perror("pipe");
114                 exit(1);
115         }
116
117         if(fork() == 0) {
118                 if(dpy)
119                         close(ConnectionNumber(dpy));
120                 setsid();
121                 dup2(pfd[1], STDOUT_FILENO);
122                 close(pfd[0]);
123                 close(pfd[1]);
124                 execvp(argv[0], argv);
125                 fprintf(stderr, "gridwm: execvp %s", argv[0]);
126                 perror(" failed");
127         }
128         else {
129                 n = 0;
130                 close(pfd[1]);
131                 while(l > n) {
132                         if((l = read(pfd[0], buf + n, len - n)) < 1)
133                                 break;
134                         n += l;
135                 }
136                 close(pfd[0]);
137                 buf[n < len ? n : len - 1] = 0;
138         }
139         wait(0);
140 }