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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [sccl.c] - Rev 262
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/*- * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* Split from vfscanf.c */ #include <_ansi.h> #include <reent.h> #include <newlib.h> #include <stdio.h> #include "local.h" /* * Fill in the given table from the scanset at the given format * (just after `['). Return a pointer to the character past the * closing `]'. The table has a 1 wherever characters should be * considered part of the scanset. */ u_char * _DEFUN(__sccl, (tab, fmt), register char *tab _AND register u_char *fmt) { register int c, n, v; /* first `clear' the whole table */ c = *fmt++; /* first char hat => negated scanset */ if (c == '^') { v = 1; /* default => accept */ c = *fmt++; /* get new first char */ } else v = 0; /* default => reject */ /* should probably use memset here */ for (n = 0; n < 256; n++) tab[n] = v; if (c == 0) return fmt - 1; /* format ended before closing ] */ /* * Now set the entries corresponding to the actual scanset to the * opposite of the above. * * The first character may be ']' (or '-') without being special; the * last character may be '-'. */ v = 1 - v; for (;;) { tab[c] = v; /* take character c */ doswitch: n = *fmt++; /* and examine the next */ switch (n) { case 0: /* format ended too soon */ return fmt - 1; case '-': /* * A scanset of the form [01+-] is defined as `the digit 0, the * digit 1, the character +, the character -', but the effect of a * scanset such as [a-zA-Z0-9] is implementation defined. The V7 * Unix scanf treats `a-z' as `the letters a through z', but treats * `a-a' as `the letter a, the character -, and the letter a'. * * For compatibility, the `-' is not considerd to define a range if * the character following it is either a close bracket (required by * ANSI) or is not numerically greater than the character we just * stored in the table (c). */ n = *fmt; if (n == ']' || n < c) { c = '-'; break; /* resume the for(;;) */ } fmt++; do { /* fill in the range */ tab[++c] = v; } while (c < n); #if 1 /* XXX another disgusting compatibility hack */ /* * Alas, the V7 Unix scanf also treats formats such * as [a-c-e] as `the letters a through e'. This too * is permitted by the standard.... */ goto doswitch; #else c = *fmt++; if (c == 0) return fmt - 1; if (c == ']') return fmt; #endif break; case ']': /* end of scanset */ return fmt; default: /* just another character */ c = n; break; } } /* NOTREACHED */ }
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