third_party/ulib/musl/src/passwd/getgr_r.c

#include "pwf.h"

#define FIX(x) (gr->gr_##x = gr->gr_##x - line + buf)

static int getgr_r(const char* name, gid_t gid, struct group* gr, char* buf, size_t size,
                   struct group** res) {
    char* line = 0;
    size_t len = 0;
    char** mem = 0;
    size_t nmem = 0;
    int rv = 0;
    size_t i;

    rv = __getgr_a(name, gid, gr, &line, &len, &mem, &nmem, res);
    if (*res && size < len + (nmem + 1) * sizeof(char*) + 32) {
        *res = 0;
        rv = ERANGE;
    }
    if (*res) {
        buf += (16 - (uintptr_t)buf) % 16;
        gr->gr_mem = (void*)buf;
        buf += (nmem + 1) * sizeof(char*);
        memcpy(buf, line, len);
        FIX(name);
        FIX(passwd);
        for (i = 0; mem[i]; i++)
            gr->gr_mem[i] = mem[i] - line + buf;
        gr->gr_mem[i] = 0;
    }
    free(mem);
    free(line);
    return rv;
}

int getgrnam_r(const char* name, struct group* gr, char* buf, size_t size, struct group** res) {
    return getgr_r(name, 0, gr, buf, size, res);
}

int getgrgid_r(gid_t gid, struct group* gr, char* buf, size_t size, struct group** res) {
    return getgr_r(0, gid, gr, buf, size, res);
}