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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [sccl.c] - Blame information for rev 207

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1 207 jeremybenn
/*-
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 * Copyright (c) 1990 The Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms are permitted
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 * provided that the above copyright notice and this paragraph are
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 * duplicated in all such forms and that any documentation,
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 * advertising materials, and other materials related to such
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 * distribution and use acknowledge that the software was developed
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 * by the University of California, Berkeley.  The name of the
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 * University may not be used to endorse or promote products derived
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 * from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 */
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/* Split from vfscanf.c  */
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#include <_ansi.h>
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#include <reent.h>
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#include <newlib.h>
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#include <stdio.h>
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#include "local.h"
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/*
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 * Fill in the given table from the scanset at the given format
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 * (just after `[').  Return a pointer to the character past the
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 * closing `]'.  The table has a 1 wherever characters should be
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 * considered part of the scanset.
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 */
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u_char *
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_DEFUN(__sccl, (tab, fmt),
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       register char *tab _AND
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       register u_char *fmt)
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{
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  register int c, n, v;
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  /* first `clear' the whole table */
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  c = *fmt++;                   /* first char hat => negated scanset */
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  if (c == '^')
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    {
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      v = 1;                    /* default => accept */
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      c = *fmt++;               /* get new first char */
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    }
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  else
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    v = 0;                       /* default => reject */
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  /* should probably use memset here */
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  for (n = 0; n < 256; n++)
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    tab[n] = v;
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  if (c == 0)
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    return fmt - 1;             /* format ended before closing ] */
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  /*
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   * Now set the entries corresponding to the actual scanset to the
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   * opposite of the above.
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   *
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   * The first character may be ']' (or '-') without being special; the
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   * last character may be '-'.
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   */
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  v = 1 - v;
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  for (;;)
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    {
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      tab[c] = v;               /* take character c */
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    doswitch:
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      n = *fmt++;               /* and examine the next */
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      switch (n)
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        {
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        case 0:          /* format ended too soon */
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          return fmt - 1;
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        case '-':
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          /*
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           * A scanset of the form [01+-] is defined as `the digit 0, the
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           * digit 1, the character +, the character -', but the effect of a
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           * scanset such as [a-zA-Z0-9] is implementation defined.  The V7
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           * Unix scanf treats `a-z' as `the letters a through z', but treats
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           * `a-a' as `the letter a, the character -, and the letter a'.
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           *
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           * For compatibility, the `-' is not considerd to define a range if
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           * the character following it is either a close bracket (required by
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           * ANSI) or is not numerically greater than the character we just
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           * stored in the table (c).
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           */
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          n = *fmt;
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          if (n == ']' || n < c)
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            {
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              c = '-';
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              break;            /* resume the for(;;) */
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            }
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          fmt++;
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          do
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            {                   /* fill in the range */
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              tab[++c] = v;
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            }
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          while (c < n);
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#if 1                   /* XXX another disgusting compatibility hack */
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          /*
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           * Alas, the V7 Unix scanf also treats formats such
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           * as [a-c-e] as `the letters a through e'. This too
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           * is permitted by the standard....
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           */
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          goto doswitch;
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#else
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          c = *fmt++;
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          if (c == 0)
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            return fmt - 1;
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          if (c == ']')
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            return fmt;
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#endif
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          break;
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        case ']':               /* end of scanset */
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          return fmt;
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        default:                /* just another character */
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          c = n;
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          break;
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        }
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    }
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  /* NOTREACHED */
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}

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