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 "wm.h"
  15
  16 void
  17 error(const 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         char *res = strdup(str);
  64         if(!res)
  65                 bad_malloc(strlen(str));
  66         return res;
  67 }
  68
  69 void
  70 swap(void **p1, void **p2)
  71 {
  72         void *tmp = *p1;
  73         *p1 = *p2;
  74         *p2 = tmp;
  75 }
  76
  77 void
  78 spawn(char *argv[])
  79 {
  80         if(!argv || !argv[0])
  81                 return;
  82         if(fork() == 0) {
  83                 if(fork() == 0) {
  84                         if(dpy)
  85                                 close(ConnectionNumber(dpy));
  86                         setsid();
  87                         execvp(argv[0], argv);
  88                         fprintf(stderr, "dwm: execvp %s", argv[0]);
  89                         perror(" failed");
  90                 }
  91                 exit (0);
  92         }
  93         wait(0);
  94 }