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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libc/] [getgrent.c] - Rev 846
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/* * POSIX 1003.1b - 9.2.1 - Group Database Access Routines * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.OARcorp.com/rtems/license.html. * * $Id: getgrent.c,v 1.2 2001-09-27 12:01:15 chris Exp $ */ #include <stdio.h> #include <sys/types.h> #include <grp.h> #include <errno.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <limits.h> static struct group gr_group; /* password structure */ static FILE *group_fp; /* * The size of these buffers is arbitrary and there is no provision * to protect any of them from overflowing. The scanf patterns * need to be changed to prevent overflowing. In addition, * the limits on these needs to be examined. */ static char groupname[8]; static char password[1024]; static char groups[1024]; static char *gr_mem[16] = { } ; extern void init_etc_passwd_group(void); int getgrnam_r( const char *name, struct group *grp, char *buffer, size_t bufsize, struct group **result ) { FILE *fp; init_etc_passwd_group(); if ((fp = fopen ("/etc/group", "r")) == NULL) { errno = EINVAL; return -1; } while (fgets (buffer, bufsize, fp)) { sscanf (buffer, "%[^:]:%[^:]:%d:%s\n", groupname, password, (int *) &grp->gr_gid, groups); grp->gr_name = groupname; grp->gr_passwd = password; grp->gr_mem = gr_mem ; if (!strcmp (groupname, name)) { fclose (fp); *result = grp; return 0; } } fclose (fp); errno = EINVAL; return -1; } struct group *getgrnam( const char *name ) { char buf[1024]; struct group *g; if ( getgrnam_r( name, &gr_group, buf, 1024, &g ) ) return NULL; return g; } int getgrgid_r( gid_t gid, struct group *grp, char *buffer, size_t bufsize, struct group **result ) { FILE *fp; init_etc_passwd_group(); if ((fp = fopen ("/etc/group", "r")) == NULL) { errno = EINVAL; return -1; } while (fgets (buffer, bufsize, fp)) { sscanf (buffer, "%[^:]:%[^:]:%d:%s\n", groupname, password, (int *) &gr_group.gr_gid, groups); gr_group.gr_name = groupname; gr_group.gr_passwd = password; gr_group.gr_mem = gr_mem ; if (gid == gr_group.gr_gid) { fclose (fp); *result = grp; return 0; } } fclose (fp); errno = EINVAL; return -1; } struct group *getgrgid ( gid_t gid ) { char buf[1024]; struct group *g; if ( getgrgid_r( gid, &gr_group, buf, 1024, &g ) ) return NULL; return g; } struct group *getgrent( void ) { char buf[1024]; if (group_fp == NULL) return NULL; if (fgets (buf, sizeof (buf), group_fp) == NULL) return NULL; sscanf (buf, "%[^:]:%[^:]:%d:%s\n", groupname, password, (int *) &gr_group.gr_gid, groups); gr_group.gr_name = groupname; gr_group.gr_passwd = password; gr_group.gr_mem = gr_mem ; return &gr_group; } void setgrent () { init_etc_passwd_group(); if (group_fp != NULL) fclose (group_fp); group_fp = fopen ("/etc/group", "r"); } void endgrent () { if (group_fp != NULL) fclose (group_fp); }
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