contrib/sendmail-8.14/libsm/sscanf.c

   1 /*
   2  * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Chris Torek.
   9  *
  10  * By using this file, you agree to the terms and conditions set
  11  * forth in the LICENSE file which can be found at the top level of
  12  * the sendmail distribution.
  13  */
  14
  15 #include <sm/gen.h>
  16 SM_RCSID("@(#)$Id: sscanf.c,v 1.25 2002/02/01 02:28:00 ca Exp $")
  17 #include <string.h>
  18 #include <sm/varargs.h>
  19 #include <sm/io.h>
  20 #include "local.h"
  21
  22 /*
  23 **  SM_EOFREAD -- dummy read function for faked file below
  24 **
  25 **      Parameters:
  26 **              fp -- file pointer
  27 **              buf -- location to place read data
  28 **              len -- number of bytes to read
  29 **
  30 **      Returns:
  31 **              0 (zero) always
  32 */
  33
  34 static ssize_t
  35 sm_eofread __P((
  36         SM_FILE_T *fp,
  37         char *buf,
  38         size_t len));
  39
  40 /* ARGSUSED0 */
  41 static ssize_t
  42 sm_eofread(fp, buf, len)
  43         SM_FILE_T *fp;
  44         char *buf;
  45         size_t len;
  46 {
  47         return 0;
  48 }
  49
  50 /*
  51 **  SM_IO_SSCANF -- scan a string to find data units
  52 **
  53 **      Parameters:
  54 **              str -- strings containing data
  55 **              fmt -- format directive for finding data units
  56 **              ... -- memory locations to place format found data units
  57 **
  58 **      Returns:
  59 **              Failure: SM_IO_EOF
  60 **              Success: number of data units found
  61 **
  62 **      Side Effects:
  63 **              Attempts to strlen() 'str'; if not a '\0' terminated string
  64 **                      then the call may SEGV/fail.
  65 **              Faking the string 'str' as a file.
  66 */
  67
  68 int
  69 #if SM_VA_STD
  70 sm_io_sscanf(const char *str, char const *fmt, ...)
  71 #else /* SM_VA_STD */
  72 sm_io_sscanf(str, fmt, va_alist)
  73         const char *str;
  74         char *fmt;
  75         va_dcl
  76 #endif /* SM_VA_STD */
  77 {
  78         int ret;
  79         SM_FILE_T fake;
  80         SM_VA_LOCAL_DECL
  81
  82         fake.sm_magic = SmFileMagic;
  83         fake.f_flags = SMRD;
  84         fake.f_bf.smb_base = fake.f_p = (unsigned char *) str;
  85         fake.f_bf.smb_size = fake.f_r = strlen(str);
  86         fake.f_file = -1;
  87         fake.f_read = sm_eofread;
  88         fake.f_write = NULL;
  89         fake.f_close = NULL;
  90         fake.f_open = NULL;
  91         fake.f_seek = NULL;
  92         fake.f_setinfo = fake.f_getinfo = NULL;
  93         fake.f_type = "sm_io_sscanf:fake";
  94         fake.f_flushfp = NULL;
  95         fake.f_ub.smb_base = NULL;
  96         fake.f_timeout = SM_TIME_FOREVER;
  97         fake.f_timeoutstate = SM_TIME_BLOCK;
  98         SM_VA_START(ap, fmt);
  99         ret = sm_vfscanf(&fake, SM_TIME_FOREVER, fmt, ap);
 100         SM_VA_END(ap);
 101         return ret;
 102 }