From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/passwd/getgr_r.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/passwd/getgr_r.c (limited to 'src/passwd/getgr_r.c') diff --git a/src/passwd/getgr_r.c b/src/passwd/getgr_r.c new file mode 100644 index 00000000..5b1333e3 --- /dev/null +++ b/src/passwd/getgr_r.c @@ -0,0 +1,53 @@ +#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 getgruid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res) +{ + return getgr_r(0, gid, gr, buf, size, res); +} -- cgit v1.2.1