cffe28ef8
Denys Vlasenko
2013-11-26
Subject
libbb: add sketch of tentative 'better' passwd/group API
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libbb/bb_pwd.c+48 -0
| @@ -110,3 +110,51 @@ unsigned long FAST_FUNC get_ug_id(const char *s, | |
| return xname2id(s); | |
| return r; | |
| } | |
| + | |
| + | /* Experimental "mallocing" API. |
| + | * The goal is nice: "we want to support a case when "guests" group is very large" |
| + | * but the code is butt-ugly. |
| + | */ |
| + | #if 0 |
| + | static char *find_latest(char last, char *cp) |
| + | { |
| + | if (!cp) |
| + | return last; |
| + | cp += strlen(cp) + 1; |
| + | if (last < cp) |
| + | last = cp; |
| + | return last; |
| + | } |
| + | |
| + | struct group* FAST_FUNC xmalloc_getgrnam(const char *name) |
| + | { |
| + | struct { |
| + | struct group gr; |
| + | // May still be not enough! |
| + | char buf[64*1024 - sizeof(struct group) - 16]; |
| + | } *s; |
| + | struct group *grp; |
| + | int r; |
| + | char *last; |
| + | char **gr_mem; |
| + | |
| + | s = xmalloc(sizeof(*s)); |
| + | r = getgrnam_r(name, &s->gr, s->buf, sizeof(s->buf), &grp); |
| + | if (!grp) { |
| + | free(s); |
| + | return grp; |
| + | } |
| + | last = find_latest(s->buf, grp->gr_name); |
| + | last = find_latest(last, grp->gr_passwd); |
| + | gr_mem = grp->gr_mem; |
| + | while (*gr_mem) |
| + | last = find_latest(last, *gr_mem++); |
| + | gr_mem++; /* points past NULL */ |
| + | if (last < (char*)gr_mem) |
| + | last = (char*)gr_mem; |
| + | //FIXME: what if we get not only truncated, but also moved here? |
| + | // grp->gr_name pointer and friends are invalid now!!! |
| + | s = xrealloc(s, last - (char*)s); |
| + | return grp; |
| + | } |
| + | #endif |