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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libpp/ppsym.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1986-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * cpp predefined symbol detection support

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 *

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 * with no args stdin is treated as an a.out for

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 * a Reiser derived cpp -- all strings that may

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 * be identifiers are listed on fd 3 (1 if no 3)

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 *

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 * with args the -D argument values are listed on fd 3 (1 if no 3)

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 */

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#include <ast.h>

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#include <ctype.h>

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int

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main(int argc, char** argv)

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{

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	register int	state;

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	register int	c;

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	register char*	s;

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	Sfio_t*		out;

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	NoP(argc);

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	if (dup(3) < 0 || !(out = sfnew(NiL, NiL, -1, 3, SF_WRITE)))

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		out = sfstdout;

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	if (*++argv)

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	{

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		while (s = *argv++)

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			if (*s++ == '-' && *s++ == 'D' && isalpha(*s))

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			{

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				while (*s && *s != '=') sfputc(out, *s++);

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				sfputc(out, '\n');

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			}

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		return 0;

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	}

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	state = 0;

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	for (;;)

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	{

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		switch (c = sfgetc(sfstdin))

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		{

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		case EOF:

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			break;

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		case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': 

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		case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': 

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		case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': 

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		case 's': case 't': case 'u': case 'v': case 'w': case 'x':

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		case 'y': case 'z': case '_':

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		case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': 

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		case 'G': case 'H': case 'I': case 'J': case 'K': case 'L': 

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		case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': 

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		case 'S': case 'T': case 'U': case 'V': case 'W': case 'X':

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		case 'Y': case 'Z': 

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			state++;

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			sfputc(out, c);

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			continue;

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		case '0': case '1': case '2': case '3': case '4': case '5': 

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		case '6': case '7': case '8': case '9':

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			if (state)

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			{

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				sfputc(out, c);

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				continue;

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			}

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			/*FALLTHROUGH*/

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		default:

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			if (state)

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			{

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				sfputc(out, '\n');

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				state = 0;

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			}

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			continue;

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		}

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		break;

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	}

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	return 0;

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}

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