github.com/aergoio/aergo@v1.3.1/libtool/src/gmp-6.1.2/scanf/sscanffuns.c (about)

     1  /* __gmp_sscanf_funs -- support for formatted input from a string.
     2  
     3     THE FUNCTIONS IN THIS FILE ARE FOR INTERNAL USE ONLY.  THEY'RE ALMOST
     4     CERTAIN TO BE SUBJECT TO INCOMPATIBLE CHANGES OR DISAPPEAR COMPLETELY IN
     5     FUTURE GNU MP RELEASES.
     6  
     7  Copyright 2001-2003, 2009 Free Software Foundation, Inc.
     8  
     9  This file is part of the GNU MP Library.
    10  
    11  The GNU MP Library is free software; you can redistribute it and/or modify
    12  it under the terms of either:
    13  
    14    * the GNU Lesser General Public License as published by the Free
    15      Software Foundation; either version 3 of the License, or (at your
    16      option) any later version.
    17  
    18  or
    19  
    20    * the GNU General Public License as published by the Free Software
    21      Foundation; either version 2 of the License, or (at your option) any
    22      later version.
    23  
    24  or both in parallel, as here.
    25  
    26  The GNU MP Library is distributed in the hope that it will be useful, but
    27  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    28  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    29  for more details.
    30  
    31  You should have received copies of the GNU General Public License and the
    32  GNU Lesser General Public License along with the GNU MP Library.  If not,
    33  see https://www.gnu.org/licenses/.  */
    34  
    35  #include <stdio.h>
    36  #include <stdarg.h>
    37  #include "gmp.h"
    38  #include "gmp-impl.h"
    39  
    40  
    41  #if 0
    42  static int
    43  scan (const char **sp, const char *fmt, ...)
    44  {
    45      va_list ap;
    46      int ret;
    47  
    48      va_start(ap, fmt);
    49      ret = vsscanf(*sp, fmt, ap);
    50      va_end(ap);
    51  
    52      return ret;
    53  }
    54  #else
    55  static int
    56  scan (const char **sp, const char *fmt, ...)
    57  {
    58    va_list ap;
    59    void *p1, *p2;
    60    int ret;
    61  
    62    va_start (ap, fmt);
    63    p1 = va_arg (ap, void *);
    64    p2 = va_arg (ap, void *);
    65  
    66    ret = sscanf (*sp, fmt, p1, p2);
    67  
    68    va_end (ap);
    69  
    70    return ret;
    71  }
    72  #endif
    73  
    74  static void
    75  step (const char **sp, int n)
    76  {
    77    ASSERT (n >= 0);
    78  
    79    /* shouldn't push us past the end of the string */
    80  #if WANT_ASSERT
    81    {
    82      int  i;
    83      for (i = 0; i < n; i++)
    84        ASSERT ((*sp)[i] != '\0');
    85    }
    86  #endif
    87  
    88    (*sp) += n;
    89  }
    90  
    91  static int
    92  get (const char **sp)
    93  {
    94    const char  *s;
    95    int  c;
    96    s = *sp;
    97    c = (unsigned char) *s++;
    98    if (c == '\0')
    99      return EOF;
   100    *sp = s;
   101    return c;
   102  }
   103  
   104  static void
   105  unget (int c, const char **sp)
   106  {
   107    const char  *s;
   108    s = *sp;
   109    if (c == EOF)
   110      {
   111        ASSERT (*s == '\0');
   112        return;
   113      }
   114    s--;
   115    ASSERT ((unsigned char) *s == c);
   116    *sp = s;
   117  }
   118  
   119  const struct gmp_doscan_funs_t  __gmp_sscanf_funs = {
   120    (gmp_doscan_scan_t)  scan,
   121    (gmp_doscan_step_t)  step,
   122    (gmp_doscan_get_t)   get,
   123    (gmp_doscan_unget_t) unget,
   124  };