#include "search-path.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


notmuch_bool_t
test_for_executable (const char *exename)
{
    char *path = NULL, *save = NULL, *tok;
    notmuch_bool_t ret = FALSE;

    if (strchr (exename, '/')) {
	if (0 == access (exename, X_OK))
	    return TRUE;
	else
	    return FALSE;
    }

    path = getenv ("PATH");
    if (path)
	path = strdup (path);
    else {
	size_t n = confstr (_CS_PATH, NULL, 0);
	path = (char *) malloc (n);
	if (! path)
	    return FALSE;
	confstr (_CS_PATH, path, n);
    }

    tok = strtok_r (path, ":", &save);
    while (tok) {
	int dir_fd = open (tok, O_DIRECTORY | O_RDONLY);
	if (dir_fd != -1) {
	    int access = faccessat (dir_fd, exename, X_OK, 0);
	    close (dir_fd);
	    if (access == 0) {
		ret = TRUE;
		break;
	    }
	}
	tok = strtok_r (NULL, ":", &save);
    }
    if (path)
	free (path);
    return ret;
}