[unix-history] / usr / othersrc / public / ghostscript-2.4.1 / ansi2knr.c

/* Copyright (C) 1989, 1991 Aladdin Enterprises.  All rights reserved.
   Distributed by Free Software Foundation, Inc.

This file is part of Ghostscript.

Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing.  Refer
to the Ghostscript General Public License for full details.

Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License.  A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities.  It should be in a file named COPYING.  Among other
things, the copyright notice and this notice must be preserved on all
copies.  */

/* ansi2knr.c */
/* Convert ANSI function declarations to K&R syntax */
#include <stdio.h>
#include <ctype.h>
#include "string_.h"
#include "malloc_.h"

/* Usage:
	ansi2knr input_file output_file
 * If no output_file is supplied, output goes to stdout.
 * There are no error messages.
 *
 * ansi2knr recognizes functions by seeing a non-keyword identifier
 * at the left margin, followed by a left parenthesis,
 * with a right parenthesis as the last character on the line.
 * It will recognize a multi-line header if the last character
 * on each line but the last is a left parenthesis or comma.
 * These algorithms ignore whitespace and comments, except that
 * the function name must be the first thing on the line.
 * The following constructs will confuse it:
	- Any other construct that starts at the left margin and
	    follows the above syntax (such as a macro or function call).
	- Macros that tinker with the syntax of the function header.
 */

/* Scanning macros */
#define isidchar(ch) (isalnum(ch) || (ch) == '_')
#define isidfirstchar(ch) (isalpha(ch) || (ch) == '_')

main(argc, argv)
    int argc;
    char *argv[];
{	FILE *in, *out;
#define bufsize 500			/* arbitrary size */
	char buf[bufsize];
	char *line;
	switch ( argc )
	   {
	default:
		printf("Usage: ansi2knr input_file [output_file]\n");
		exit(0);
	case 2:
		out = stdout; break;
	case 3:
		out = fopen(argv[2], "w");
		if ( out == NULL )
		   {	fprintf(stderr, "Cannot open %s\n", argv[2]);
			exit(1);
		   }
	   }
	in = fopen(argv[1], "r");
	if ( in == NULL )
	   {	fprintf(stderr, "Cannot open %s\n", argv[1]);
		exit(1);
	   }
	fprintf(out, "#line 1 \"%s\"\n", argv[1]);
	line = buf;
	while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
	   {	switch ( test1(buf) )
		   {
		case 1:			/* a function */
			convert1(buf, out);
			break;
		case -1:		/* maybe the start of a function */
			line = buf + strlen(buf);
			continue;
		default:		/* not a function */
			fputs(buf, out);
			break;
		   }
		line = buf;
	   }
	if ( line != buf ) fputs(buf, out);
	fclose(out);
	fclose(in);
	return 0;
}

/* Skip over space and comments, in either direction. */
char *
skipspace(p, dir)
    register char *p;
    register int dir;			/* 1 for forward, -1 for backward */
{	for ( ; ; )
	   {	while ( isspace(*p) ) p += dir;
		if ( !(*p == '/' && p[dir] == '*') ) break;
		p += dir;  p += dir;
		while ( !(*p == '*' && p[dir] == '/') )
		   {	if ( *p == 0 ) return p;	/* multi-line comment?? */
			p += dir;
		   }
		p += dir;  p += dir;
	   }
	return p;
}

/*
 * Write blanks over part of a string.
 */
void
writeblanks(start, end)
    char *start;
    char *end;
{	char *p;
	for ( p = start; p < end; p++ ) *p = ' ';
}

/*
 * Test whether the string in buf is a function definition.
 * The string may contain and/or end with a newline.
 * Return as follows:
 *	0 - definitely not a function definition;
 *	1 - definitely a function definition;
 *	-1 - may be the beginning of a function definition,
 *		append another line and look again.
 */
test1(buf)
    char *buf;
{	register char *p = buf;
	char *bend;
	char *endfn;
	int contin;
	if ( !isidfirstchar(*p) )
		return 0;		/* no name at left margin */
	bend = skipspace(buf + strlen(buf) - 1, -1);
	switch ( *bend )
	   {
	case ')': contin = 1; break;
	case '(':
	case ',': contin = -1; break;
	default: return 0;		/* not a function */
	   }
	while ( isidchar(*p) ) p++;
	endfn = p;
	p = skipspace(p, 1);
	if ( *p++ != '(' )
		return 0;		/* not a function */
	p = skipspace(p, 1);
	if ( *p == ')' )
		return 0;		/* no parameters */
	/* Check that the apparent function name isn't a keyword. */
	/* We only need to check for keywords that could be followed */
	/* by a left parenthesis (which, unfortunately, is most of them). */
	   {	static char *words[] =
		   {	"asm", "auto", "case", "char", "const", "double",
			"extern", "float", "for", "if", "int", "long",
			"register", "return", "short", "signed", "sizeof",
			"static", "switch", "typedef", "unsigned",
			"void", "volatile", "while", 0
		   };
		char **key = words;
		char *kp;
		int len = endfn - buf;
		while ( (kp = *key) != 0 )
		   {	if ( strlen(kp) == len && !strncmp(kp, buf, len) )
				return 0;	/* name is a keyword */
			key++;
		   }
	   }
	return contin;
}

convert1(buf, out)
    char *buf;
    FILE *out;
{	char *endfn = strchr(buf, '(') + 1;
	register char *p;
	char **breaks;
	unsigned num_breaks = 2;	/* for testing */
	char **btop;
	char **bp;
	char **ap;
top:	p = endfn;
	breaks = (char **)malloc(sizeof(char *) * num_breaks * 2);
	if ( breaks == 0 )
	   {	/* Couldn't allocate break table, give up */
		fprintf(stderr, "Unable to allocate break table!\n");
		fputs(buf, out);
		return -1;
	   }
	btop = breaks + num_breaks * 2 - 2;
	bp = breaks;
	/* Parse the argument list */
	do
	   {	int level = 0;
		char *end = NULL;
		if ( bp >= btop )
		   {	/* Filled up break table. */
			/* Allocate a bigger one and start over. */
			free((char *)breaks);
			num_breaks <<= 1;
			goto top;
		   }
		*bp++ = p;
		/* Find the end of the argument */
		for ( ; end == NULL; p++ )
		   {	switch(*p)
			   {
			case ',': if ( !level ) end = p; break;
			case '(': level++; break;
			case ')': if ( --level < 0 ) end = p; break;
			case '/': p = skipspace(p, 1) - 1; break;
			default: ;
			   }
		   }
		p--;			/* back up over terminator */
		/* Find the name being declared. */
		/* This is complicated because of procedure and */
		/* array modifiers. */
		for ( ; ; )
		   {	p = skipspace(p - 1, -1);
			switch ( *p )
			   {
			case ']':	/* skip array dimension(s) */
			case ')':	/* skip procedure args OR name */
			   {	int level = 1;
				while ( level )
				 switch ( *--p )
				   {
				case ']': case ')': level++; break;
				case '[': case '(': level--; break;
				case '/': p = skipspace(p, -1) + 1; break;
				default: ;
				   }
			   }
				if ( *p == '(' && *skipspace(p + 1, 1) == '*' )
				   {	/* We found the name being declared */
					while ( !isidfirstchar(*p) )
						p = skipspace(p, 1) + 1;
					goto found;
				   }
				break;
			default: goto found;
			   }
		   }
found:		if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
		   {	p++;
			if ( bp == breaks + 1 )	/* sole argument */
				writeblanks(breaks[0], p);
			else
				writeblanks(bp[-1] - 1, p);
			bp--;
		   }
		else
		   {	while ( isidchar(*p) ) p--;
			*bp++ = p+1;
		   }
		p = end;
	   }
	while ( *p++ == ',' );
	*bp = p;
	/* Make a special check for 'void' arglist */
	if ( bp == breaks+2 )
	   {	p = skipspace(breaks[0], 1);
		if ( !strncmp(p, "void", 4) )
		   {	p = skipspace(p+4, 1);
			if ( p == breaks[2] - 1 )
			   {	bp = breaks;	/* yup, pretend arglist is empty */
				writeblanks(breaks[0], p + 1);
			   }
		   }
	   }
	/* Put out the function name */
	p = buf;
	while ( p != endfn ) putc(*p, out), p++;
	/* Put out the declaration */
	for ( ap = breaks+1; ap < bp; ap += 2 )
	   {	p = *ap;
		while ( isidchar(*p) ) putc(*p, out), p++;
		if ( ap < bp - 1 ) fputs(", ", out);
	   }
	fputs(")  ", out);
	/* Put out the argument declarations */
	for ( ap = breaks+2; ap <= bp; ap += 2 ) (*ap)[-1] = ';';
	fputs(breaks[0], out);
	free((char *)breaks);
	return 0;
}
Commit	Line	Data
528b75e1 WJ	1	/* Copyright (C) 1989, 1991 Aladdin Enterprises. All rights reserved.
	2	Distributed by Free Software Foundation, Inc.
	3
	4	This file is part of Ghostscript.
	5
	6	Ghostscript is distributed in the hope that it will be useful, but
	7	WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
	8	to anyone for the consequences of using it or for whether it serves any
	9	particular purpose or works at all, unless he says so in writing. Refer
	10	to the Ghostscript General Public License for full details.
	11
	12	Everyone is granted permission to copy, modify and redistribute
	13	Ghostscript, but only under the conditions described in the Ghostscript
	14	General Public License. A copy of this license is supposed to have been
	15	given to you along with Ghostscript so you can know your rights and
	16	responsibilities. It should be in a file named COPYING. Among other
	17	things, the copyright notice and this notice must be preserved on all
	18	copies. */
	19
	20	/* ansi2knr.c */
	21	/* Convert ANSI function declarations to K&R syntax */
	22	#include <stdio.h>
	23	#include <ctype.h>
	24	#include "string_.h"
	25	#include "malloc_.h"
	26
	27	/* Usage:
	28	ansi2knr input_file output_file
	29	* If no output_file is supplied, output goes to stdout.
	30	* There are no error messages.
	31	*
	32	* ansi2knr recognizes functions by seeing a non-keyword identifier
	33	* at the left margin, followed by a left parenthesis,
	34	* with a right parenthesis as the last character on the line.
	35	* It will recognize a multi-line header if the last character
	36	* on each line but the last is a left parenthesis or comma.
	37	* These algorithms ignore whitespace and comments, except that
	38	* the function name must be the first thing on the line.
	39	* The following constructs will confuse it:
	40	- Any other construct that starts at the left margin and
	41	follows the above syntax (such as a macro or function call).
	42	- Macros that tinker with the syntax of the function header.
	43	*/
	44
	45	/* Scanning macros */
	46	#define isidchar(ch) (isalnum(ch) \|\| (ch) == '_')
	47	#define isidfirstchar(ch) (isalpha(ch) \|\| (ch) == '_')
	48
	49	main(argc, argv)
	50	int argc;
	51	char *argv[];
	52	{ FILE in, out;
	53	#define bufsize 500 /* arbitrary size */
	54	char buf[bufsize];
	55	char *line;
	56	switch ( argc )
	57	{
	58	default:
	59	printf("Usage: ansi2knr input_file [output_file]\n");
	60	exit(0);
	61	case 2:
	62	out = stdout; break;
	63	case 3:
	64	out = fopen(argv[2], "w");
65	if ( out == NULL )
66	{ fprintf(stderr, "Cannot open %s\n", argv[2]);
67	exit(1);
68	}
69	}
70	in = fopen(argv[1], "r");
71	if ( in == NULL )
72	{ fprintf(stderr, "Cannot open %s\n", argv[1]);
73	exit(1);
74	}
75	fprintf(out, "#line 1 \"%s\"\n", argv[1]);
76	line = buf;
77	while ( fgets(line, (unsigned)(buf + bufsize - line), in) != NULL )
78	{ switch ( test1(buf) )
79	{
80	case 1: /* a function */
81	convert1(buf, out);
82	break;
83	case -1: /* maybe the start of a function */
84	line = buf + strlen(buf);
85	continue;
86	default: /* not a function */
87	fputs(buf, out);
88	break;
89	}
90	line = buf;
91	}
92	if ( line != buf ) fputs(buf, out);
93	fclose(out);
94	fclose(in);
95	return 0;
96	}
97
98	/* Skip over space and comments, in either direction. */
99	char *
100	skipspace(p, dir)
101	register char *p;
102	register int dir; /* 1 for forward, -1 for backward */
103	{ for ( ; ; )
104	{ while ( isspace(*p) ) p += dir;
105	if ( !(p == '/' && p[dir] == '') ) break;
106	p += dir; p += dir;
107	while ( !(p == '' && p[dir] == '/') )
108	{ if ( p == 0 ) return p; / multi-line comment?? */
109	p += dir;
110	}
111	p += dir; p += dir;
112	}
113	return p;
114	}
115
116	/*
117	* Write blanks over part of a string.
118	*/
119	void
120	writeblanks(start, end)
121	char *start;
122	char *end;
123	{ char *p;
124	for ( p = start; p < end; p++ ) *p = ' ';
125	}
126
127	/*
128	* Test whether the string in buf is a function definition.
129	* The string may contain and/or end with a newline.
130	* Return as follows:
131	* 0 - definitely not a function definition;
132	* 1 - definitely a function definition;
133	* -1 - may be the beginning of a function definition,
134	* append another line and look again.
135	*/
136	test1(buf)
137	char *buf;
138	{ register char *p = buf;
139	char *bend;
140	char *endfn;
141	int contin;
142	if ( !isidfirstchar(*p) )
143	return 0; /* no name at left margin */
144	bend = skipspace(buf + strlen(buf) - 1, -1);
145	switch ( *bend )
146	{
147	case ')': contin = 1; break;
148	case '(':
149	case ',': contin = -1; break;
150	default: return 0; /* not a function */
151	}
152	while ( isidchar(*p) ) p++;
153	endfn = p;
154	p = skipspace(p, 1);
155	if ( *p++ != '(' )
156	return 0; /* not a function */
157	p = skipspace(p, 1);
158	if ( *p == ')' )
159	return 0; /* no parameters */
160	/* Check that the apparent function name isn't a keyword. */
161	/* We only need to check for keywords that could be followed */
162	/* by a left parenthesis (which, unfortunately, is most of them). */
163	{ static char *words[] =
164	{ "asm", "auto", "case", "char", "const", "double",
165	"extern", "float", "for", "if", "int", "long",
166	"register", "return", "short", "signed", "sizeof",
167	"static", "switch", "typedef", "unsigned",
168	"void", "volatile", "while", 0
169	};
170	char **key = words;
171	char *kp;
172	int len = endfn - buf;
173	while ( (kp = *key) != 0 )
174	{ if ( strlen(kp) == len && !strncmp(kp, buf, len) )
175	return 0; /* name is a keyword */
176	key++;
177	}
178	}
179	return contin;
180	}
181
182	convert1(buf, out)
183	char *buf;
184	FILE *out;
185	{ char *endfn = strchr(buf, '(') + 1;
186	register char *p;
187	char **breaks;
188	unsigned num_breaks = 2; /* for testing */
189	char **btop;
190	char **bp;
191	char **ap;
192	top: p = endfn;
193	breaks = (char *)malloc(sizeof(char ) * num_breaks * 2);
194	if ( breaks == 0 )
195	{ /* Couldn't allocate break table, give up */
196	fprintf(stderr, "Unable to allocate break table!\n");
197	fputs(buf, out);
198	return -1;
199	}
200	btop = breaks + num_breaks * 2 - 2;
201	bp = breaks;
202	/* Parse the argument list */
203	do
204	{ int level = 0;
205	char *end = NULL;
206	if ( bp >= btop )
207	{ /* Filled up break table. */
208	/* Allocate a bigger one and start over. */
209	free((char *)breaks);
210	num_breaks <<= 1;
211	goto top;
212	}
213	*bp++ = p;
214	/* Find the end of the argument */
215	for ( ; end == NULL; p++ )
216	{ switch(*p)
217	{
218	case ',': if ( !level ) end = p; break;
219	case '(': level++; break;
220	case ')': if ( --level < 0 ) end = p; break;
221	case '/': p = skipspace(p, 1) - 1; break;
222	default: ;
223	}
224	}
225	p--; /* back up over terminator */
226	/* Find the name being declared. */
227	/* This is complicated because of procedure and */
228	/* array modifiers. */
229	for ( ; ; )
230	{ p = skipspace(p - 1, -1);
231	switch ( *p )
232	{
233	case ']': /* skip array dimension(s) */
234	case ')': /* skip procedure args OR name */
235	{ int level = 1;
236	while ( level )
237	switch ( *--p )
238	{
239	case ']': case ')': level++; break;
240	case '[': case '(': level--; break;
241	case '/': p = skipspace(p, -1) + 1; break;
242	default: ;
243	}
244	}
245	if ( p == '(' && skipspace(p + 1, 1) == '*' )
246	{ /* We found the name being declared */
247	while ( !isidfirstchar(*p) )
248	p = skipspace(p, 1) + 1;
249	goto found;
250	}
251	break;
252	default: goto found;
253	}
254	}
255	found: if ( *p == '.' && p[-1] == '.' && p[-2] == '.' )
256	{ p++;
257	if ( bp == breaks + 1 ) /* sole argument */
258	writeblanks(breaks[0], p);
259	else
260	writeblanks(bp[-1] - 1, p);
261	bp--;
262	}
263	else
264	{ while ( isidchar(*p) ) p--;
265	*bp++ = p+1;
266	}
267	p = end;
268	}
269	while ( *p++ == ',' );
270	*bp = p;
271	/* Make a special check for 'void' arglist */
272	if ( bp == breaks+2 )
273	{ p = skipspace(breaks[0], 1);
274	if ( !strncmp(p, "void", 4) )
275	{ p = skipspace(p+4, 1);
276	if ( p == breaks[2] - 1 )
277	{ bp = breaks; /* yup, pretend arglist is empty */
278	writeblanks(breaks[0], p + 1);
279	}
280	}
281	}
282	/* Put out the function name */
283	p = buf;
284	while ( p != endfn ) putc(*p, out), p++;
285	/* Put out the declaration */
286	for ( ap = breaks+1; ap < bp; ap += 2 )
287	{ p = *ap;
288	while ( isidchar(p) ) putc(p, out), p++;
289	if ( ap < bp - 1 ) fputs(", ", out);
290	}
291	fputs(") ", out);
292	/* Put out the argument declarations */
293	for ( ap = breaks+2; ap <= bp; ap += 2 ) (*ap)[-1] = ';';
294	fputs(breaks[0], out);
295	free((char *)breaks);
296	return 0;
297	}