// SPDX-License-Identifier: GPL-2.0-or-later
//
// <stdlib.h> for lwIP, shadowing the host's. See shim/string.h for why these
// files exist at all.
//
// lwIP does not need an allocator from here: MEM_LIBC_MALLOC is off, so it uses
// its own pools out of a static heap. That is not a workaround -- the kernel's
// allocator hands out whole pages and lwIP wants byte granularity, so its pools
// are the better fit either way.
//
// atoi is the one thing it genuinely calls, in netif_name_to_index, to turn the
// digits at the end of an interface name into a number.
#ifndef LWIP_SHIM_STDLIB_H
#define LWIP_SHIM_STDLIB_H

// Deliberately not a general atoi: no sign, no whitespace, no overflow
// handling. It is fed the tail of an interface name ("en0" -> "0"), and
// anything cleverer would be untested code answering a question nobody asks.
static inline int
atoi(const char *s)
{
    int n = 0;
    while (*s >= '0' && *s <= '9')
        n = n * 10 + (*s++ - '0');
    return n;
}

#endif