386BSD 0.1 development

[unix-history] / usr / src / usr.bin / m4 / misc.c

/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ozan Yigit.
*
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. 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.
*/

#ifndef lint
static char sccsid[] = "@(#)misc.c      5.6 (Berkeley) 2/26/91";
#endif /* not lint */

/*
* misc.c
* Facility: m4 macro processor
* by: oz
*/

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mdef.h"
#include "extr.h" 
#include "pathnames.h"

/*
* indx - find the index of second str in the
*        first str.
*/
indx(s1, s2)
char *s1;
char *s2;
{
       register char *t;
       register char *p;
       register char *m;

       for (p = s1; *p; p++) {
               for (t = p, m = s2; *m && *m == *t; m++, t++)
                       ;
               if (!*m)
                       return(p - s1);
       }
       return (-1);
}

/*
*  putback - push character back onto input
*
*/
putback (c)
char c;
{
       if (bp < endpbb)
               *bp++ = c;
       else
               error("m4: too many characters pushed back");
}

/*
*  pbstr - push string back onto input
*          putback is replicated to improve
*          performance.
*
*/
pbstr(s)
register char *s;
{
       register char *es;
       register char *zp;

       es = s;
       zp = bp;

       while (*es)
               es++;
       es--;
       while (es >= s)
               if (zp < endpbb)
                       *zp++ = *es--;
       if ((bp = zp) == endpbb)
               error("m4: too many characters pushed back");
}

/*
*  pbnum - convert number to string, push back on input.
*
*/
pbnum (n)
int n;
{
       register int num;

       num = (n < 0) ? -n : n;
       do {
               putback(num % 10 + '0');
       }
       while ((num /= 10) > 0);

       if (n < 0) putback('-');
}

/*
*  chrsave - put single char on string space
*
*/
chrsave (c)
char c;
{
/***        if (sp < 0)
               putc(c, active);
       else ***/ if (ep < endest)
               *ep++ = c;
       else
               error("m4: string space overflow");
}

/*
* getdiv - read in a diversion file, and
*          trash it.
*/
getdiv(ind) {
       register int c;
       register FILE *dfil;

       if (active == outfile[ind])
               error("m4: undivert: diversion still active.");
       (void) fclose(outfile[ind]);
       outfile[ind] = NULL;
       m4temp[UNIQUE] = ind + '0';
       if ((dfil = fopen(m4temp, "r")) == NULL)
               error("m4: cannot undivert.");
       else
               while((c = getc(dfil)) != EOF)
                       putc(c, active);
       (void) fclose(dfil);

       if (unlink(m4temp) == -1)
               error("m4: cannot unlink.");
}

/*
* Very fatal error. Close all files
* and die hard.
*/
error(s)
char *s;
{
       killdiv();
       fprintf(stderr,"%s\n",s);
       exit(1);
}

/*
* Interrupt handling
*/
static char *msg = "\ninterrupted.";

void
onintr() {
       error(msg);
}

/*
* killdiv - get rid of the diversion files
*
*/
killdiv() {
       register int n;

       for (n = 0; n < MAXOUT; n++)
               if (outfile[n] != NULL) {
                       (void) fclose (outfile[n]);
                       m4temp[UNIQUE] = n + '0';
                       (void) unlink (m4temp);
               }
}

usage() {
       fprintf(stderr, "usage: m4 [-Dname[=val]] [-Uname]\n");
       exit(1);
}