garbeam@2: /*
garbeam@2:  * (C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
garbeam@2:  * See LICENSE file for license details.
garbeam@2:  */
garbeam@2: 
garbeam@2: #include <stdarg.h>
garbeam@2: #include <stdio.h>
garbeam@2: #include <stdlib.h>
garbeam@3: #include <string.h>
garbeam@5: #include <sys/types.h>
garbeam@5: #include <sys/wait.h>
garbeam@5: #include <unistd.h>
garbeam@5: 
garbeam@5: #include "util.h"
garbeam@2: 
garbeam@6: static char *shell = NULL;
garbeam@6: 
garbeam@2: void
garbeam@2: error(char *errstr, ...) {
garbeam@2: 	va_list ap;
garbeam@2: 	va_start(ap, errstr);
garbeam@2: 	vfprintf(stderr, errstr, ap);
garbeam@2: 	va_end(ap);
garbeam@2: 	exit(1);
garbeam@2: }
garbeam@2: 
garbeam@3: static void
garbeam@3: bad_malloc(unsigned int size)
garbeam@3: {
garbeam@3: 	fprintf(stderr, "fatal: could not malloc() %d bytes\n",
garbeam@3: 			(int) size);
garbeam@3: 	exit(1);
garbeam@3: }
garbeam@3: 
garbeam@3: void *
garbeam@3: emallocz(unsigned int size)
garbeam@3: {
garbeam@3: 	void *res = calloc(1, size);
garbeam@3: 	if(!res)
garbeam@3: 		bad_malloc(size);
garbeam@3: 	return res;
garbeam@3: }
garbeam@3: 
garbeam@3: void *
garbeam@3: emalloc(unsigned int size)
garbeam@3: {
garbeam@3: 	void *res = malloc(size);
garbeam@3: 	if(!res)
garbeam@3: 		bad_malloc(size);
garbeam@3: 	return res;
garbeam@3: }
garbeam@3: 
garbeam@3: void *
garbeam@3: erealloc(void *ptr, unsigned int size)
garbeam@3: {
garbeam@3: 	void *res = realloc(ptr, size);
garbeam@3: 	if(!res)
garbeam@3: 		bad_malloc(size);
garbeam@3: 	return res;
garbeam@3: }
garbeam@3: 
garbeam@3: char *
garbeam@3: estrdup(const char *str)
garbeam@3: {
garbeam@3: 	void *res = strdup(str);
garbeam@3: 	if(!res)
garbeam@3: 		bad_malloc(strlen(str));
garbeam@3: 	return res;
garbeam@3: }
garbeam@3: 
garbeam@3: void
garbeam@3: failed_assert(char *a, char *file, int line)
garbeam@3: {
garbeam@3: 	fprintf(stderr, "Assertion \"%s\" failed at %s:%d\n", a, file, line);
garbeam@3: 	abort();
garbeam@3: }
garbeam@3: 
garbeam@3: void
garbeam@3: swap(void **p1, void **p2)
garbeam@3: {
garbeam@3: 	void *tmp = *p1;
garbeam@3: 	*p1 = *p2;
garbeam@3: 	*p2 = tmp;
garbeam@3: }
garbeam@5: 
garbeam@5: void
garbeam@6: spawn(Display *dpy, const char *cmd)
garbeam@5: {
garbeam@6: 	if(!shell && !(shell = getenv("SHELL")))
garbeam@6: 		shell = "/bin/sh";
garbeam@6: 
garbeam@6: 	if(!cmd)
garbeam@5: 		return;
garbeam@5: 	if(fork() == 0) {
garbeam@5: 		if(fork() == 0) {
garbeam@5: 			if(dpy)
garbeam@5: 				close(ConnectionNumber(dpy));
garbeam@9: 			setsid();
garbeam@9: 			fprintf(stderr, "gridwm: execlp %s %s -c %s", shell, shell, cmd);
garbeam@9: 			execlp(shell, shell, "-c", cmd, NULL);
garbeam@9: 			fprintf(stderr, "gridwm: execlp %s", cmd);
garbeam@5: 			perror(" failed");
garbeam@5: 		}
garbeam@5: 		exit (0);
garbeam@5: 	}
garbeam@5: 	wait(0);
garbeam@5: }
garbeam@6: 
garbeam@6: void
garbeam@6: pipe_spawn(char *buf, unsigned int len, Display *dpy, const char *cmd)
garbeam@6: {
garbeam@6: 	unsigned int l, n;
garbeam@6: 	int pfd[2];
garbeam@6: 
garbeam@6: 	if(!shell && !(shell = getenv("SHELL")))
garbeam@6: 		shell = "/bin/sh";
garbeam@6: 
garbeam@6: 	if(!cmd)
garbeam@6: 		return;
garbeam@6: 
garbeam@6: 	if(pipe(pfd) == -1) {
garbeam@6: 		perror("pipe");
garbeam@6: 		exit(1);
garbeam@6: 	}
garbeam@6: 
garbeam@6: 	if(fork() == 0) {
garbeam@6: 		if(dpy)
garbeam@6: 			close(ConnectionNumber(dpy));
garbeam@9: 		setsid();
garbeam@6: 		dup2(pfd[1], STDOUT_FILENO);
garbeam@6: 		close(pfd[0]);
garbeam@6: 		close(pfd[1]);
garbeam@9: 		execlp(shell, shell, "-c", cmd, NULL);
garbeam@9: 		fprintf(stderr, "gridwm: execlp %s", cmd);
garbeam@6: 		perror(" failed");
garbeam@6: 	}
garbeam@6: 	else {
garbeam@6: 		n = 0;
garbeam@6: 		close(pfd[1]);
garbeam@6: 		while(l > n) {
garbeam@6: 			if((l = read(pfd[0], buf + n, len - n)) < 1)
garbeam@6: 				break;
garbeam@6: 			n += l;
garbeam@6: 		}
garbeam@6: 		close(pfd[0]);
garbeam@6: 		buf[n - 1] = 0;
garbeam@6: 	}
garbeam@6: 	wait(0);
garbeam@6: }