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-rw-r--r--pwd/pwdread.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/pwd/pwdread.c b/pwd/pwdread.c
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index 0000000..0ce27d7
--- /dev/null
+++ b/pwd/pwdread.c
@@ -0,0 +1,116 @@
+/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pwd.h>
+#include <sys/types.h>
+
+
+/* This is the function that all the others are based on.
+ The format of the password file is known only here. */
+
+/* Structure containing info kept by each __pwdread caller. */
+typedef struct
+ {
+ char *buf;
+ size_t buflen;
+ struct passwd p;
+ } pwdread_info;
+
+
+/* Return a chunk of memory containing a pre-initialized `pwdread_info'. */
+PTR
+DEFUN_VOID(__pwdalloc)
+{
+ pwdread_info *info = (PTR) malloc (sizeof(pwdread_info));
+ if (info == NULL)
+ return NULL;
+ info->buf = NULL;
+ info->buflen = 0;
+ return info;
+}
+
+/* Read a password entry from STREAM, filling in P. */
+struct passwd *
+DEFUN(__pwdread, (stream, p), FILE *stream AND PTR CONST p)
+{
+ register pwdread_info *CONST info = (pwdread_info *) p;
+ char *start, *end;
+
+ /* Idiocy checks. */
+ if (stream == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ do
+ if (__getline (&info->buf, &info->buflen, stream) == -1)
+ return NULL;
+ while (info->buf[0] == '#');
+
+ start = info->buf;
+ end = strchr (start, ':');
+ if (end == NULL)
+ return NULL;
+ *end = '\0';
+ info->p.pw_name = start;
+
+ start = end + 1;
+ end = strchr (start, ':');
+ if (end == NULL)
+ return NULL;
+ *end = '\0';
+ info->p.pw_passwd = start;
+
+ info->p.pw_uid = (uid_t) strtol (end + 1, &end, 10);
+ if (*end != ':')
+ return NULL;
+ info->p.pw_gid = (gid_t) strtol (end + 1, &end, 10);
+ if (*end != ':')
+ return NULL;
+
+ start = end + 1;
+ end = strchr (start, ':');
+ if (end == NULL)
+ return NULL;
+ *end = '\0';
+ info->p.pw_gecos = start;
+
+ start = end + 1;
+ end = strchr (start, ':');
+ if (end == NULL)
+ return NULL;
+ *end = '\0';
+ info->p.pw_dir = start;
+
+ start = end + 1;
+ end = strchr (start, '\n');
+ if (end == NULL)
+ return NULL;
+ *end = '\0';
+ info->p.pw_shell = start;
+
+ return &info->p;
+}