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Viewing changes to src/passwd/getgr_r.c

  • Committer: Package Import Robot
  • Author(s): Kevin Bortis
  • Date: 2013-09-20 20:54:14 UTC
  • Revision ID: package-import@ubuntu.com-20130920205414-5b61trtmma18w58o
Tags: upstream-0.9.13
Import upstream version 0.9.13

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Lines of Context:
src/passwd/getgr_r.c
 
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#include "pwf.h"
 
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#include <pthread.h>
 
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#define FIX(x) (gr->gr_##x = gr->gr_##x-line+buf)
 
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static int getgr_r(const char *name, gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
 
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{
 
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        FILE *f;
 
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        char *line = 0;
 
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        size_t len = 0;
 
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        char **mem = 0;
 
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        size_t nmem = 0;
 
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        int rv = 0;
 
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        size_t i;
 
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        int cs;
 
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        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
 
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        f = fopen("/etc/group", "rbe");
 
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        if (!f) {
 
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                rv = errno;
 
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                goto done;
 
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        }
 
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        *res = 0;
 
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        while (__getgrent_a(f, gr, &line, &len, &mem, &nmem)) {
 
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                if (name && !strcmp(name, gr->gr_name)
 
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                || !name && gr->gr_gid == gid) {
 
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                        if (size < len + nmem*sizeof(char *) + 32) {
 
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                                rv = ERANGE;
 
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                                break;
 
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                        }
 
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                        *res = gr;
 
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                        buf += (16-(uintptr_t)buf)%16;
 
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                        gr->gr_mem = (void *)buf;
 
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                        buf += nmem*sizeof(char *);
 
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                        memcpy(buf, line, len);
 
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                        FIX(name);
 
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                        FIX(passwd);
 
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                        for (i=0; mem[i]; i++)
 
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                                gr->gr_mem[i] = mem[i]-line+buf;
 
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                        gr->gr_mem[i] = 0;
 
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                        break;
 
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                }
 
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        }
 
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        free(mem);
 
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        free(line);
 
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        fclose(f);
 
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done:
 
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        pthread_setcancelstate(cs, 0);
 
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        return rv;
 
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}
 
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int getgrnam_r(const char *name, struct group *gr, char *buf, size_t size, struct group **res)
 
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{
 
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        return getgr_r(name, 0, gr, buf, size, res);
 
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}
 
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int getgrgid_r(gid_t gid, struct group *gr, char *buf, size_t size, struct group **res)
 
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{
 
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        return getgr_r(0, gid, gr, buf, size, res);
 
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}