128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
/*-
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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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