[PATCH] replace fgets() with mmap() and introduce udev_lib.[hc]

[elogind.git] / klibc_fixups.c

diff --git a/klibc_fixups.c b/klibc_fixups.c
index a5d5d5948a1ea876855136fa317b33f468640abc..eaa240c183fa59c6a34161d21c8ad30ea3d9f9d9 100644 (file)
--- a/klibc_fixups.c
+++ b/klibc_fixups.c
@@ -1,33 +1,161 @@
+/*
+ * klibc_fixups.c - very simple implementation of stuff missing in klibc
+ *
+ * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
+ *
+ *     This program is free software; you can redistribute it and/or modify it
+ *     under the terms of the GNU General Public License as published by the
+ *     Free Software Foundation version 2 of the License.
+ * 
+ *     This program 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
+ *     General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License along
+ *     with this program; if not, write to the Free Software Foundation, Inc.,
+ *     675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
 
 #ifdef __KLIBC__
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <ctype.h>
+#include <fcntl.h>
+#include <sys/types.h>
 
-char *strerror(int errnum)
+#include "udev.h"
+#include "klibc_fixups.h"
+#include "logging.h"
+
+#define PW_FILE                "/etc/passwd"
+#define GR_FILE                "/etc/group"
+#define UTMP_FILE      "/var/run/utmp"
+
+
+/* return the id of a passwd style line, selected by the users name */
+static unsigned long get_id_by_name(const char *uname, const char *dbfile)
+{
+       unsigned long id = -1;
+       char line[255];
+       char *buf;
+       size_t bufsize;
+       size_t cur;
+       size_t count;
+       char *pos;
+       char *name;
+       char *idstr;
+       char *tail;
+
+       if (file_map(dbfile, &buf, &bufsize) == 0) {
+               dbg("reading '%s' as db file", dbfile);
+       } else {
+               dbg("can't open '%s' as db file", dbfile);
+               return -1;
+       }
+
+       /* loop through the whole file */
+
+       cur = 0;
+       while (1) {
+               count = buf_get_line(buf, bufsize, cur);
+
+               strncpy(line, buf + cur, count);
+               line[count] = '\0';
+               pos = line;
+
+               cur += count+1;
+               if (cur > bufsize)
+                       break;
+
+               /* get name */
+               name = strsep(&pos, ":");
+               if (name == NULL)
+                       continue;
+
+               /* skip pass */
+               if (strsep(&pos, ":") == NULL)
+                       continue;
+
+               /* get id */
+               idstr = strsep(&pos, ":");
+               if (idstr == NULL)
+                       continue;
+
+               if (strcmp(uname, name) == 0) {
+                       id = strtoul(idstr, &tail, 10);
+                       if (tail[0] != '\0')
+                               id = -1;
+                       else
+                               dbg("id for '%s' is '%li'", name, id);
+                       break;
+               }
+       }
+
+       file_unmap(buf, bufsize);
+       return id;
+}
+
+struct passwd *getpwnam(const char *name)
+{
+       static struct passwd pw;
+
+       memset(&pw, 0x00, sizeof(struct passwd));
+       pw.pw_uid = (uid_t) get_id_by_name(name, PW_FILE);
+       if (pw.pw_uid < 0)
+               return NULL;
+       else
+               return &pw;
+}
+
+struct group *getgrnam(const char *name)
 {
-       return "some error";
+       static struct group gr;
+
+       memset(&gr, 0x00, sizeof(struct group));
+       gr.gr_gid = (gid_t) get_id_by_name(name, GR_FILE);
+       if (gr.gr_gid < 0)
+               return NULL;
+       else
+               return &gr;
 }
 
-int strcasecmp(const char *s1, const char *s2)
+
+int ufd = -1;
+
+void setutent()
 {
-       char *n1;
-       char *n2;
+       if (ufd < 0)
+               ufd = open(UTMP_FILE, O_RDONLY);
+       fcntl(ufd, F_SETFD, FD_CLOEXEC);
+       lseek(ufd, 0, SEEK_SET);
+}
+
+void endutent() {
+       if (ufd < 0)
+               return;
+       close(ufd);
+       ufd = -1;
+}
+
+struct utmp *getutent(void)
+{
+       static struct utmp utmp;
        int retval;
-       int i;
-
-       n1 = strdup(s1);
-       n2 = strdup(s2);
-       
-       for (i = 0; i < strlen(n1); ++i)
-               n1[i] = toupper(n1[i]);
-       for (i = 0; i < strlen(n2); ++i)
-               n2[i] = toupper(n2[i]);
-       retval = strcmp(n1, n2);
-       free(n1);
-       free(n2);
-       return retval;
+
+       if (ufd < 0) {
+               setutent();
+               if (ufd < 0)
+                       return NULL;
+       }
+       retval = read(ufd, &utmp, sizeof(struct utmp));
+       if (retval < 1)
+               return NULL;
+       return &utmp;
 }
-       
+
 #endif