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/* uroot - User's root
* utils.h Header file with various utility functions
*
* Copyright (C) 2018 Karel Kočí
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#ifndef _UROOT_UTILS_H_
#define _UROOT_UTILS_H_
#define _GNU_SOURCE
#include <alloca.h>
#include <sys/types.h>
// Compute the size needed (including \0) to format given message
size_t printf_len(const char *msg, ...) __attribute__((format(printf, 1, 2)));
// Like sprintf, but returs the string. Expects there's enough space.
char *printf_into(char *dst, const char *msg, ...) __attribute__((format(printf, 2, 3)));
// Like printf, but allocates the data on the stack with alloca and returns. It
// uses the arguments multiple times, so beware of side effects.
#define aprintf(...) printf_into(alloca(printf_len(__VA_ARGS__)), __VA_ARGS__)
// returns path to shell interpreter
const char *get_shell();
enum mapidtype {
MAP_ID_USER,
MAP_ID_GROUP
};
// call newuidmap or newgidmap for process of given pid
int new_map_id(enum mapidtype type, pid_t pid, int id);
#endif
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