xref: /src/usr.bin/fsplit/fsplit.c

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Asa Romberger and Jerry Berkman.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "from: @(#)fsplit.c	8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: fsplit.c,v 1.16 2008/11/16 03:52:24 dholland Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>

#include <ctype.h>
#include <err.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/*
 *	usage:		fsplit [-e efile] ... [file]
 *
 *	split single file containing source for several fortran programs
 *		and/or subprograms into files each containing one
 *		subprogram unit.
 *	each separate file will be named using the corresponding subroutine,
 *		function, block data or program name if one is found; otherwise
 *		the name will be of the form mainNNN.f or blkdtaNNN.f .
 *		If a file of that name exists, it is saved in a name of the
 *		form zzz000.f .
 *	If -e option is used, then only those subprograms named in the -e
 *		option are split off; e.g.:
 *			fsplit -esub1 -e sub2 prog.f
 *		isolates sub1 and sub2 in sub1.f and sub2.f.  The space
 *		after -e is optional.
 *
 *	Modified Feb., 1983 by Jerry Berkman, Computing Services, U.C. Berkeley.
 *		- added comments
 *		- more function types: double complex, character*(*), etc.
 *		- fixed minor bugs
 *		- instead of all unnamed going into zNNN.f, put mains in
 *		  mainNNN.f, block datas in blkdtaNNN.f, dups in zzzNNN.f .
 */

#define BSZ 512
static char buf[BSZ];
static FILE *ifp;

static char x[]="zzz000.f";
static char mainp[]="main000.f";
static char blkp[]="blkdta000.f";

static void badparms(void);
static const char *functs(const char *);
static int getline(void);
static void get_name(char *, int);
static int lend(void);
static int lname(char *, size_t);
static const char *look(const char *, const char *);
static int saveit(const char *);
static int scan_name(char *, const char *);
static const char *skiplab(const char *);

static bool	extr = false;
static int	extrknt = -1;
static bool	extrfnd[100];
static char	extrbuf[1000];
static char	*extrnames[100];
static struct stat sbuf;

#define trim(p)	while (*p == ' ' || *p == '\t') p++

int
main(int argc, char **argv)
{
	FILE *ofp;	/* output file */
	int rv;		/* 1 if got card in output file, 0 otherwise */
	char *ptr;
	int nflag;	/* 1 if got name of subprog., 0 otherwise */
	int retval, i;
	char name[20], *extrptr = extrbuf;

	/*  scan -e options */
	while ( argc > 1  && argv[1][0] == '-' && argv[1][1] == 'e') {
		extr = true;
		ptr = argv[1] + 2;
		if(!*ptr) {
			argc--;
			argv++;
			if(argc <= 1) badparms();
			ptr = argv[1];
		}
		extrknt = extrknt + 1;
		extrnames[extrknt] = extrptr;
		extrfnd[extrknt] = false;
		while(*ptr) *extrptr++ = *ptr++;
		*extrptr++ = '\0';
		argc--;
		argv++;
	}

	if (argc > 2)
		badparms();
	else if (argc == 2) {
		if ((ifp = fopen(argv[1], "r")) == NULL) {
			err(1, "%s", argv[1]);
		}
	}
	else
		ifp = stdin;
    for(;;) {
	/* look for a temp file that doesn't correspond to an existing file */
	get_name(x, 3);
	ofp = fopen(x, "w");
	if (ofp == NULL) {
		err(1, "%s", x);
	}
	nflag = 0;
	rv = 0;
	while (getline() > 0) {
		rv = 1;
		fprintf(ofp, "%s", buf);
		if (lend())		/* look for an 'end' statement */
			break;
		if (nflag == 0)		/* if no name yet, try and find one */
			nflag = lname(name, sizeof(name));
	}
	fclose(ofp);
	if (rv == 0) {			/* no lines in file, forget the file */
		unlink(x);
		retval = 0;
		for ( i = 0; i <= extrknt; i++ )
			if(!extrfnd[i]) {
				retval = 1;
				warnx("%s not found\n", extrnames[i]);
			}
		exit( retval );
	}
	if (nflag) {			/* rename the file */
		if(saveit(name)) {
			if (stat(name, &sbuf) < 0 ) {
				link(x, name);
				unlink(x);
				printf("%s\n", name);
				continue;
			} else if (strcmp(name, x) == 0) {
				printf("%s\n", x);
				continue;
			}
			printf("%s already exists, put in %s\n", name, x);
			continue;
		} else
			unlink(x);
			continue;
	}
	if(!extr)
		printf("%s\n", x);
	else
		unlink(x);
    }
}

static void
badparms(void)
{
	err(1, "Usage: fsplit [-e efile] ... [file]");
}

static int
saveit(const char *name)
{
	int i;
	char	fname[50],
		*fptr = fname;

	if(!extr) return(1);
	while(*name) *fptr++ = *name++;
	*--fptr = '\0';
	*--fptr = '\0';
	for ( i=0 ; i<=extrknt; i++ )
		if( strcmp(fname, extrnames[i]) == 0 ) {
			extrfnd[i] = true;
			return(1);
		}
	return(0);
}

static void
get_name(char *name, int letters)
{
	char *ptr;

	while (stat(name, &sbuf) >= 0) {
		for (ptr = name + letters + 2; ptr >= name + letters; ptr--) {
			(*ptr)++;
			if (*ptr <= '9')
				break;
			*ptr = '0';
		}
		if(ptr < name + letters) {
			errx(1, "Ran out of file names.\n");
		}
	}
}

static int
getline(void)
{
	char *ptr;

	for (ptr = buf; ptr < &buf[BSZ]; ) {
		*ptr = getc(ifp);
		if (feof(ifp))
			return (-1);
		if (*ptr++ == '\n') {
			*ptr = '\0';
			return (1);
		}
	}
	while (getc(ifp) != '\n' && feof(ifp) == 0) ;
	warnx("Line truncated to %d characters.", BSZ);
	return (1);
}

/* return 1 for 'end' alone on card (up to col. 72),  0 otherwise */
static int
lend(void)
{
	const char *p;

	if ((p = skiplab(buf)) == 0)
		return (0);
	trim(p);
	if (*p != 'e' && *p != 'E') return(0);
	p++;
	trim(p);
	if (*p != 'n' && *p != 'N') return(0);
	p++;
	trim(p);
	if (*p != 'd' && *p != 'D') return(0);
	p++;
	trim(p);
	if (p - buf >= 72 || *p == '\n')
		return (1);
	return (0);
}

/*		check for keywords for subprograms
		return 0 if comment card, 1 if found
		name and put in arg string. invent name for unnamed
		block datas and main programs.		*/

static int
lname(char *s, size_t l)
{
#	define LINESIZE 80
	const char *ptr, *p;
	char	line[LINESIZE], *iptr = line;

	/* first check for comment cards */
	if(buf[0] == 'c' || buf[0] == 'C' || buf[0] == '*') return(0);
	ptr = buf;
	while (*ptr == ' ' || *ptr == '\t') ptr++;
	if(*ptr == '\n') return(0);


	ptr = skiplab(buf);
	if (ptr == NULL)
		return (0);


	/*  copy to buffer and converting to lower case */
	p = ptr;
	while (*p && p <= &buf[71] ) {
	   *iptr = tolower((unsigned char)*p);
	   iptr++;
	   p++;
	}
	*iptr = '\n';

	if ((ptr = look(line, "subroutine")) != NULL ||
	    (ptr = look(line, "function")) != NULL ||
	    (ptr = functs(line)) != NULL) {
		if(scan_name(s, ptr)) return(1);
		strlcpy(s, x, l);
	} else if((ptr = look(line, "program")) != NULL) {
		if(scan_name(s, ptr)) return(1);
		get_name(mainp, 4);
		strlcpy(s, mainp, l);
	} else if((ptr = look(line, "blockdata")) != NULL) {
		if(scan_name(s, ptr)) return(1);
		get_name( blkp, 6);
		strlcpy(s, blkp, l);
	} else if((ptr = functs(line)) != NULL) {
		if(scan_name(s, ptr)) return(1);
		strlcpy(s, x, l);
	} else {
		get_name(mainp, 4);
		strlcpy(s, mainp, l);
	}
	return(1);
}

static int
scan_name(char *s, const char *ptr)
{
	char *sptr;

	/* scan off the name */
	trim(ptr);
	sptr = s;
	while (*ptr != '(' && *ptr != '\n') {
		if (*ptr != ' ' && *ptr != '\t')
			*sptr++ = *ptr;
		ptr++;
	}

	if (sptr == s) return(0);

	*sptr++ = '.';
	*sptr++ = 'f';
	*sptr++ = '\0';
	return(1);
}

static const char *
functs(const char *p)
{
        const char *ptr;

/*      look for typed functions such as: real*8 function,
                character*16 function, character*(*) function  */

        if((ptr = look(p,"character")) != NULL ||
           (ptr = look(p,"logical")) != NULL ||
           (ptr = look(p,"real")) != NULL ||
           (ptr = look(p,"integer")) != NULL ||
           (ptr = look(p,"doubleprecision")) != NULL ||
           (ptr = look(p,"complex")) != NULL ||
           (ptr = look(p,"doublecomplex")) != NULL ) {
                while ( *ptr == ' ' || *ptr == '\t' || *ptr == '*'
			|| (*ptr >= '0' && *ptr <= '9')
			|| *ptr == '(' || *ptr == ')') ptr++;
		ptr = look(ptr,"function");
		return(ptr);
	}
        else
                return NULL;
}

/* 	if first 6 col. blank, return ptr to col. 7,
	if blanks and then tab, return ptr after tab,
	else return NULL (labelled statement, comment or continuation) */

static const char *
skiplab(const char *p)
{
	const char *ptr;

	for (ptr = p; ptr < &p[6]; ptr++) {
		if (*ptr == ' ')
			continue;
		if (*ptr == '\t') {
			ptr++;
			break;
		}
		return NULL;
	}
	return (ptr);
}

/* 	return NULL if m doesn't match initial part of s;
	otherwise return ptr to next char after m in s */

static const char *
look(const char *s, const char *m)
{
	const char *sp, *mp;

	sp = s; mp = m;
	while (*mp) {
		trim(sp);
		if (*sp++ != *mp++)
			return NULL;
	}
	return (sp);
}