overhaul internally-public declarations using wrapper headers

[musl] / src / env / getenv.c

#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libc.h"

char *getenv(const char *name)
{
        size_t l = __strchrnul(name, '=') - name;
        if (l && !name[l] && __environ)
                for (char **e = __environ; *e; e++)
                        if (!strncmp(name, *e, l) && l[*e] == '=')
                                return *e + l+1;
        return 0;
}