added logo+description

[dwm.git] / util.c

diff --git a/util.c b/util.c
index 3553f5d..0a5bd96 100644 (file)
--- a/util.c
+++ b/util.c
@@ -6,9 +6,15 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#include "wm.h"
 
 void
-error(char *errstr, ...) {
+error(const char *errstr, ...) {
        va_list ap;
        va_start(ap, errstr);
        vfprintf(stderr, errstr, ap);
@@ -16,3 +22,73 @@ error(char *errstr, ...) {
        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)
+{
+       char *res = strdup(str);
+       if(!res)
+               bad_malloc(strlen(str));
+       return res;
+}
+
+void
+swap(void **p1, void **p2)
+{
+       void *tmp = *p1;
+       *p1 = *p2;
+       *p2 = tmp;
+}
+
+void
+spawn(char *argv[])
+{
+       if(!argv || !argv[0])
+               return;
+       if(fork() == 0) {
+               if(fork() == 0) {
+                       if(dpy)
+                               close(ConnectionNumber(dpy));
+                       setsid();
+                       execvp(argv[0], argv);
+                       fprintf(stderr, "dwm: execvp %s", argv[0]);
+                       perror(" failed");
+               }
+               exit (0);
+       }
+       wait(0);
+}