util.c
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/*
* (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 "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);
}