libc/pwd_grp/pwd_grp_internal.c

   1 /*
   2  * Copyright (C) 2003     Manuel Novoa III <mjn3@uclibc.org>
   3  * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
   4  *
   5  * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 /*  Nov 6, 2003  Initial version.
   9  *
  10  *  NOTE: This implementation is quite strict about requiring all
  11  *    field seperators.  It also does not allow leading whitespace
  12  *    except when processing the numeric fields.  glibc is more
  13  *    lenient.  See the various glibc difference comments below.
  14  *
  15  *  TODO:
  16  *    Move to dynamic allocation of (currently statically allocated)
  17  *      buffers; especially for the group-related functions since
  18  *      large group member lists will cause error returns.
  19  *
  20  */
  21
  22 #include <features.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <stdint.h>
  26 #include <string.h>
  27 #include <stddef.h>
  28 #include <errno.h>
  29 #include <malloc.h>
  30 #include <assert.h>
  31 #include <ctype.h>
  32 #include <pwd.h>
  33 #include <grp.h>
  34 #include <paths.h>
  35 #ifdef __UCLIBC_HAS_SHADOW__
  36 #include <shadow.h>
  37 #endif
  38
  39 /**********************************************************************/
  40 /* Prototypes for internal functions. */
  41
  42 #if !defined(GETXXKEY_R_FUNC) && !defined(GETXXKEY_FUNC)
  43 #error GETXXKEY_R_FUNC/GETXXKEY_FUNC are not defined!
  44 #endif
  45 /**********************************************************************/
  46 #ifdef GETXXKEY_R_FUNC
  47
  48 libc_hidden_proto(GETXXKEY_R_FUNC)
  49 int GETXXKEY_R_FUNC(DO_GETXXKEY_R_KEYTYPE key,
  50                                         GETXXKEY_R_ENTTYPE *__restrict resultbuf,
  51                                         char *__restrict buffer, size_t buflen,
  52                                         GETXXKEY_R_ENTTYPE **__restrict result)
  53 {
  54         FILE *stream;
  55         int rv;
  56
  57         *result = NULL;
  58
  59         if (!(stream = fopen(DO_GETXXKEY_R_PATHNAME, "r"))) {
  60                 rv = errno;
  61         } else {
  62                 __STDIO_SET_USER_LOCKING(stream);
  63                 do {
  64                         if (!(rv = __pgsreader(GETXXKEY_R_PARSER, resultbuf,
  65                                                                    buffer, buflen, stream))
  66                                 ) {
  67                                 if (GETXXKEY_R_TEST(resultbuf)) { /* Found key? */
  68                                         *result = resultbuf;
  69                                         break;
  70                                 }
  71                         } else {
  72                                 if (rv == ENOENT) {     /* end-of-file encountered. */
  73                                         rv = 0;
  74                                 }
  75                                 break;
  76                         }
  77                 } while (1);
  78                 fclose(stream);
  79         }
  80
  81         return rv;
  82 }
  83 libc_hidden_def(GETXXKEY_R_FUNC)
  84
  85 #endif /* GETXXKEY_R_FUNC */
  86
  87 /**********************************************************************/
  88 #ifdef GETXXKEY_FUNC
  89
  90 #define REENTRANT_NAME APPEND_R(GETXXKEY_FUNC)
  91 #define APPEND_R(name) APPEND_R1(name)
  92 #define APPEND_R1(name) name##_r
  93
  94 GETXXKEY_ENTTYPE *GETXXKEY_FUNC(GETXXKEY_ADD_PARAMS)
  95 {
  96         static char *buffer = NULL;
  97         static GETXXKEY_ENTTYPE resultbuf;
  98         GETXXKEY_ENTTYPE *result;
  99
 100         if (buffer == NULL)
 101                 buffer = (char *)__uc_malloc(GETXXKEY_BUFLEN);
 102
 103 # ifdef GETXXKEY_ADD_VARIABLES
 104         REENTRANT_NAME(GETXXKEY_ADD_VARIABLES, &resultbuf, buffer, GETXXKEY_BUFLEN, &result);
 105 # else
 106         REENTRANT_NAME(&resultbuf, buffer, GETXXKEY_BUFLEN, &result);
 107 # endif
 108         return result;
 109 }
 110 #ifdef GETXXKEY_FUNC_HIDDEN
 111 libc_hidden_def(GETXXKEY_FUNC)
 112 #endif
 113
 114 #undef REENTRANT_NAME
 115 #undef APPEND_R
 116 #undef APPEND_R1
 117 #endif /* GETXXKEY_FUNC */
 118
 119 /**********************************************************************/
 120 #undef GETXXKEY_FUNC
 121 #undef GETXXKEY_ENTTYPE
 122 #undef GETXXKEY_BUFLEN
 123 #undef GETXXKEY_FUNC_HIDDEN
 124 #undef GETXXKEY_ADD_PARAMS
 125 #undef GETXXKEY_ADD_VARIABLES
 126 #undef GETXXKEY_R_FUNC
 127 #undef GETXXKEY_R_PARSER
 128 #undef GETXXKEY_R_ENTTYPE
 129 #undef GETXXKEY_R_TEST
 130 #undef DO_GETXXKEY_R_KEYTYPE
 131 #undef DO_GETXXKEY_R_PATHNAME