slstatus/components/run_command.c

/* See LICENSE file for copyright and license details. */
#include <errno.h>
#include <stdio.h>
#include <string.h>

#include "../util.h"

const char *
run_command(const char *cmd)
{
	char *p;
	FILE *fp;

	if (!(fp = popen(cmd, "r"))) {
		fprintf(stderr, "popen '%s': %s\n", cmd, strerror(errno));
		return NULL;
	}
	p = fgets(buf, sizeof(buf) - 1, fp);
	pclose(fp);
	if (!p)
		return NULL;
	if ((p = strrchr(buf, '\n')) != NULL)
		p[0] = '\0';

	return buf[0] ? buf : NULL;
}