source/libs/gmp/gmp-src/scanf/sscanffuns.c

   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 };