| #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) |
| { |
| FILE *f; |
| char *line = 0; |
| size_t len = 0; |
| char **mem = 0; |
| size_t nmem = 0; |
| int rv = 0; |
| size_t i; |
| |
| f = fopen("/etc/group", "rb"); |
| if (!f) return errno; |
| |
| *res = 0; |
| while (__getgrent_a(f, gr, &line, &len, &mem, &nmem)) { |
| if (name && !strcmp(name, gr->gr_name) |
| || !name && gr->gr_gid == gid) { |
| if (size < len + nmem*sizeof(char *) + 32) { |
| rv = ERANGE; |
| break; |
| } |
| *res = gr; |
| buf += (16-(uintptr_t)buf)%16; |
| gr->gr_mem = (void *)buf; |
| buf += nmem*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; |
| break; |
| } |
| } |
| free(mem); |
| free(line); |
| fclose(f); |
| 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); |
| } |