794 lines
16 KiB
C
794 lines
16 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ozan Yigit at York University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)eval.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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/*
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* eval.c
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* Facility: m4 macro processor
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* by: oz
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mdef.h"
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#include "stdd.h"
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#include "extern.h"
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#include "pathnames.h"
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/*
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* eval - evaluate built-in macros.
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* argc - number of elements in argv.
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* argv - element vector :
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* argv[0] = definition of a user
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* macro or nil if built-in.
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* argv[1] = name of the macro or
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* built-in.
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* argv[2] = parameters to user-defined
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* . macro or built-in.
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* .
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*
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* Note that the minimum value for argc is 3. A call in the form
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* of macro-or-builtin() will result in:
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* argv[0] = nullstr
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* argv[1] = macro-or-builtin
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* argv[2] = nullstr
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*/
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void
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eval(argv, argc, td)
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register char *argv[];
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register int argc;
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register int td;
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{
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register int c, n;
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static int sysval = 0;
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#ifdef DEBUG
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printf("argc = %d\n", argc);
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for (n = 0; n < argc; n++)
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printf("argv[%d] = %s\n", n, argv[n]);
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#endif
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/*
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* if argc == 3 and argv[2] is null, then we
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* have macro-or-builtin() type call. We adjust
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* argc to avoid further checking..
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*/
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if (argc == 3 && !*(argv[2]))
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argc--;
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switch (td & ~STATIC) {
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case DEFITYPE:
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if (argc > 2)
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dodefine(argv[2], (argc > 3) ? argv[3] : null);
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break;
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case PUSDTYPE:
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if (argc > 2)
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dopushdef(argv[2], (argc > 3) ? argv[3] : null);
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break;
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case DUMPTYPE:
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dodump(argv, argc);
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break;
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case EXPRTYPE:
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/*
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* doexpr - evaluate arithmetic
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* expression
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*/
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if (argc > 2)
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pbnum(expr(argv[2]));
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break;
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case IFELTYPE:
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if (argc > 4)
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doifelse(argv, argc);
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break;
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case IFDFTYPE:
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/*
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* doifdef - select one of two
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* alternatives based on the existence of
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* another definition
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*/
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if (argc > 3) {
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if (lookup(argv[2]) != nil)
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pbstr(argv[3]);
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else if (argc > 4)
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pbstr(argv[4]);
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}
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break;
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case LENGTYPE:
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/*
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* dolen - find the length of the
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* argument
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*/
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if (argc > 2)
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pbnum((argc > 2) ? strlen(argv[2]) : 0);
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break;
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case INCRTYPE:
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/*
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* doincr - increment the value of the
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* argument
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*/
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if (argc > 2)
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pbnum(atoi(argv[2]) + 1);
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break;
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case DECRTYPE:
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/*
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* dodecr - decrement the value of the
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* argument
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*/
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if (argc > 2)
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pbnum(atoi(argv[2]) - 1);
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break;
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case SYSCTYPE:
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/*
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* dosys - execute system command
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*/
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/* Make sure m4 output is NOT interrupted */
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fflush(stdout);
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fflush(stderr);
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if (argc > 2)
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sysval = system(argv[2]);
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break;
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case SYSVTYPE:
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/*
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* dosysval - return value of the last
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* system call.
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*
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*/
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pbnum(sysval);
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break;
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case INCLTYPE:
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if (argc > 2)
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if (!doincl(argv[2]))
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oops("%s: %s", argv[2], strerror(errno));
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break;
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case SINCTYPE:
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if (argc > 2)
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(void) doincl(argv[2]);
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break;
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#ifdef EXTENDED
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case PASTTYPE:
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if (argc > 2)
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if (!dopaste(argv[2]))
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oops("%s: %s", argv[2], strerror(errno));
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break;
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case SPASTYPE:
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if (argc > 2)
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(void) dopaste(argv[2]);
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break;
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#endif
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case CHNQTYPE:
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dochq(argv, argc);
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break;
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case CHNCTYPE:
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dochc(argv, argc);
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break;
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case SUBSTYPE:
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/*
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* dosub - select substring
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*
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*/
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if (argc > 3)
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dosub(argv, argc);
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break;
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case SHIFTYPE:
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/*
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* doshift - push back all arguments
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* except the first one (i.e. skip
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* argv[2])
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*/
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if (argc > 3) {
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for (n = argc - 1; n > 3; n--) {
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putback(rquote);
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pbstr(argv[n]);
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putback(lquote);
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putback(',');
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}
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putback(rquote);
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pbstr(argv[3]);
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putback(lquote);
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}
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break;
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case DIVRTYPE:
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if (argc > 2 && (n = atoi(argv[2])) != 0)
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dodiv(n);
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else {
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active = stdout;
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oindex = 0;
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}
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break;
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case UNDVTYPE:
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doundiv(argv, argc);
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break;
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case DIVNTYPE:
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/*
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* dodivnum - return the number of
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* current output diversion
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*/
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pbnum(oindex);
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break;
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case UNDFTYPE:
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/*
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* doundefine - undefine a previously
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* defined macro(s) or m4 keyword(s).
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*/
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if (argc > 2)
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for (n = 2; n < argc; n++)
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remhash(argv[n], ALL);
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break;
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case POPDTYPE:
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/*
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* dopopdef - remove the topmost
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* definitions of macro(s) or m4
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* keyword(s).
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*/
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if (argc > 2)
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for (n = 2; n < argc; n++)
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remhash(argv[n], TOP);
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break;
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case MKTMTYPE:
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/*
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* dotemp - create a temporary file
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*/
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if (argc > 2)
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pbstr(mktemp(argv[2]));
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break;
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case TRNLTYPE:
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/*
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* dotranslit - replace all characters in
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* the source string that appears in the
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* "from" string with the corresponding
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* characters in the "to" string.
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*/
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if (argc > 3) {
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char temp[MAXTOK];
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if (argc > 4)
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map(temp, argv[2], argv[3], argv[4]);
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else
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map(temp, argv[2], argv[3], null);
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pbstr(temp);
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}
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else if (argc > 2)
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pbstr(argv[2]);
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break;
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case INDXTYPE:
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/*
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* doindex - find the index of the second
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* argument string in the first argument
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* string. -1 if not present.
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*/
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pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1);
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break;
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case ERRPTYPE:
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/*
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* doerrp - print the arguments to stderr
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* file
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*/
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if (argc > 2) {
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for (n = 2; n < argc; n++)
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fprintf(stderr, "%s ", argv[n]);
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fprintf(stderr, "\n");
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}
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break;
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case DNLNTYPE:
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/*
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* dodnl - eat-up-to and including
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* newline
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*/
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while ((c = gpbc()) != '\n' && c != EOF)
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;
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break;
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case M4WRTYPE:
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/*
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* dom4wrap - set up for
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* wrap-up/wind-down activity
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*/
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m4wraps = (argc > 2) ? xstrdup(argv[2]) : null;
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break;
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case EXITTYPE:
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/*
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* doexit - immediate exit from m4.
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*/
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killdiv();
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exit((argc > 2) ? atoi(argv[2]) : 0);
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break;
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case DEFNTYPE:
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if (argc > 2)
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for (n = 2; n < argc; n++)
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dodefn(argv[n]);
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break;
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default:
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oops("%s: major botch.", "eval");
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break;
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}
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}
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char *dumpfmt = "`%s'\t`%s'\n"; /* format string for dumpdef */
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/*
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* expand - user-defined macro expansion
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*/
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void
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expand(argv, argc)
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register char *argv[];
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register int argc;
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{
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register unsigned char *t;
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register unsigned char *p;
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register int n;
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register int argno;
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t = argv[0]; /* defn string as a whole */
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p = t;
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while (*p)
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p++;
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p--; /* last character of defn */
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while (p > t) {
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if (*(p - 1) != ARGFLAG)
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putback(*p);
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else {
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switch (*p) {
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case '#':
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pbnum(argc - 2);
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if ((argno = *p - '0') < argc - 1)
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pbstr(argv[argno + 1]);
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break;
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case '*':
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for (n = argc - 1; n > 2; n--) {
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pbstr(argv[n]);
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putback(',');
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}
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pbstr(argv[2]);
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break;
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default:
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putback(*p);
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putback('$');
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break;
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}
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p--;
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}
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p--;
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}
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if (p == t) /* do last character */
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putback(*p);
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}
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/*
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* dodefine - install definition in the table
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*/
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void
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dodefine(name, defn)
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register char *name;
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register char *defn;
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{
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register ndptr p;
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if (!*name)
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oops("null definition.");
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if (STREQ(name, defn))
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oops("%s: recursive definition.", name);
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if ((p = lookup(name)) == nil)
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p = addent(name);
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else if (p->defn != null)
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free((char *) p->defn);
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if (!*defn)
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p->defn = null;
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else
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p->defn = xstrdup(defn);
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p->type = MACRTYPE;
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}
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/*
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* dodefn - push back a quoted definition of
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* the given name.
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*/
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void
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dodefn(name)
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char *name;
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{
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register ndptr p;
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if ((p = lookup(name)) != nil && p->defn != null) {
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putback(rquote);
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pbstr(p->defn);
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putback(lquote);
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}
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}
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/*
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* dopushdef - install a definition in the hash table
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* without removing a previous definition. Since
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* each new entry is entered in *front* of the
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* hash bucket, it hides a previous definition from
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* lookup.
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*/
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void
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dopushdef(name, defn)
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register char *name;
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register char *defn;
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{
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register ndptr p;
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if (!*name)
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oops("null definition");
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if (STREQ(name, defn))
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oops("%s: recursive definition.", name);
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p = addent(name);
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if (!*defn)
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p->defn = null;
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else
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p->defn = xstrdup(defn);
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p->type = MACRTYPE;
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}
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/*
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* dodumpdef - dump the specified definitions in the hash
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* table to stderr. If nothing is specified, the entire
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* hash table is dumped.
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*/
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void
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dodump(argv, argc)
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register char *argv[];
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register int argc;
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{
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register int n;
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ndptr p;
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if (argc > 2) {
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for (n = 2; n < argc; n++)
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if ((p = lookup(argv[n])) != nil)
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fprintf(stderr, dumpfmt, p->name,
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p->defn);
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}
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else {
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for (n = 0; n < HASHSIZE; n++)
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for (p = hashtab[n]; p != nil; p = p->nxtptr)
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fprintf(stderr, dumpfmt, p->name,
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p->defn);
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}
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}
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/*
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* doifelse - select one of two alternatives - loop.
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*/
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void
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doifelse(argv, argc)
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register char *argv[];
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register int argc;
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{
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cycle {
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if (STREQ(argv[2], argv[3]))
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pbstr(argv[4]);
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else if (argc == 6)
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pbstr(argv[5]);
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else if (argc > 6) {
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argv += 3;
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argc -= 3;
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continue;
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}
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break;
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}
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}
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/*
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* doinclude - include a given file.
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*/
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int
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doincl(ifile)
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char *ifile;
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{
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if (ilevel + 1 == MAXINP)
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oops("too many include files.");
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if ((infile[ilevel + 1] = fopen(ifile, "r")) != NULL) {
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ilevel++;
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bbase[ilevel] = bufbase = bp;
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return (1);
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}
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else
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return (0);
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}
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#ifdef EXTENDED
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/*
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* dopaste - include a given file without any
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* macro processing.
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*/
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int
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dopaste(pfile)
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char *pfile;
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{
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FILE *pf;
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register int c;
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if ((pf = fopen(pfile, "r")) != NULL) {
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while ((c = getc(pf)) != EOF)
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putc(c, active);
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(void) fclose(pf);
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return (1);
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}
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else
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return (0);
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}
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#endif
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/*
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* dochq - change quote characters
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*/
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void
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dochq(argv, argc)
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register char *argv[];
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register int argc;
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{
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if (argc > 2) {
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if (*argv[2])
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lquote = *argv[2];
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if (argc > 3) {
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if (*argv[3])
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rquote = *argv[3];
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}
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else
|
|
rquote = lquote;
|
|
}
|
|
else {
|
|
lquote = LQUOTE;
|
|
rquote = RQUOTE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dochc - change comment characters
|
|
*/
|
|
void
|
|
dochc(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
if (argc > 2) {
|
|
if (*argv[2])
|
|
scommt = *argv[2];
|
|
if (argc > 3) {
|
|
if (*argv[3])
|
|
ecommt = *argv[3];
|
|
}
|
|
else
|
|
ecommt = ECOMMT;
|
|
}
|
|
else {
|
|
scommt = SCOMMT;
|
|
ecommt = ECOMMT;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* dodivert - divert the output to a temporary file
|
|
*/
|
|
void
|
|
dodiv(n)
|
|
register int n;
|
|
{
|
|
if (n < 0 || n >= MAXOUT)
|
|
n = 0; /* bitbucket */
|
|
if (outfile[n] == NULL) {
|
|
m4temp[UNIQUE] = n + '0';
|
|
if ((outfile[n] = fopen(m4temp, "w")) == NULL)
|
|
oops("%s: cannot divert.", m4temp);
|
|
}
|
|
oindex = n;
|
|
active = outfile[n];
|
|
}
|
|
|
|
/*
|
|
* doundivert - undivert a specified output, or all
|
|
* other outputs, in numerical order.
|
|
*/
|
|
void
|
|
doundiv(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register int ind;
|
|
register int n;
|
|
|
|
if (argc > 2) {
|
|
for (ind = 2; ind < argc; ind++) {
|
|
n = atoi(argv[ind]);
|
|
if (n > 0 && n < MAXOUT && outfile[n] != NULL)
|
|
getdiv(n);
|
|
|
|
}
|
|
}
|
|
else
|
|
for (n = 1; n < MAXOUT; n++)
|
|
if (outfile[n] != NULL)
|
|
getdiv(n);
|
|
}
|
|
|
|
/*
|
|
* dosub - select substring
|
|
*/
|
|
void
|
|
dosub(argv, argc)
|
|
register char *argv[];
|
|
register int argc;
|
|
{
|
|
register unsigned char *ap, *fc, *k;
|
|
register int nc;
|
|
|
|
if (argc < 5)
|
|
nc = MAXTOK;
|
|
else
|
|
#ifdef EXPR
|
|
nc = expr(argv[4]);
|
|
#else
|
|
nc = atoi(argv[4]);
|
|
#endif
|
|
ap = argv[2]; /* target string */
|
|
#ifdef EXPR
|
|
fc = ap + expr(argv[3]); /* first char */
|
|
#else
|
|
fc = ap + atoi(argv[3]); /* first char */
|
|
#endif
|
|
if (fc >= ap && fc < ap + strlen(ap))
|
|
for (k = fc + min(nc, strlen(fc)) - 1; k >= fc; k--)
|
|
putback(*k);
|
|
}
|
|
|
|
/*
|
|
* map:
|
|
* map every character of s1 that is specified in from
|
|
* into s3 and replace in s. (source s1 remains untouched)
|
|
*
|
|
* This is a standard implementation of map(s,from,to) function of ICON
|
|
* language. Within mapvec, we replace every character of "from" with
|
|
* the corresponding character in "to". If "to" is shorter than "from",
|
|
* than the corresponding entries are null, which means that those
|
|
* characters dissapear altogether. Furthermore, imagine
|
|
* map(dest, "sourcestring", "srtin", "rn..*") type call. In this case,
|
|
* `s' maps to `r', `r' maps to `n' and `n' maps to `*'. Thus, `s'
|
|
* ultimately maps to `*'. In order to achieve this effect in an efficient
|
|
* manner (i.e. without multiple passes over the destination string), we
|
|
* loop over mapvec, starting with the initial source character. if the
|
|
* character value (dch) in this location is different than the source
|
|
* character (sch), sch becomes dch, once again to index into mapvec, until
|
|
* the character value stabilizes (i.e. sch = dch, in other words
|
|
* mapvec[n] == n). Even if the entry in the mapvec is null for an ordinary
|
|
* character, it will stabilize, since mapvec[0] == 0 at all times. At the
|
|
* end, we restore mapvec* back to normal where mapvec[n] == n for
|
|
* 0 <= n <= 127. This strategy, along with the restoration of mapvec, is
|
|
* about 5 times faster than any algorithm that makes multiple passes over
|
|
* destination string.
|
|
*/
|
|
void
|
|
map(dest, src, from, to)
|
|
register char *dest;
|
|
register char *src;
|
|
register char *from;
|
|
register char *to;
|
|
{
|
|
register char *tmp;
|
|
register char sch, dch;
|
|
static char mapvec[128] = {
|
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
|
|
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23,
|
|
24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
|
|
36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
|
|
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
|
|
60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
|
|
72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
|
|
84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
|
|
96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
|
|
108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119,
|
|
120, 121, 122, 123, 124, 125, 126, 127
|
|
};
|
|
|
|
if (*src) {
|
|
tmp = from;
|
|
/*
|
|
* create a mapping between "from" and
|
|
* "to"
|
|
*/
|
|
while (*from)
|
|
mapvec[*from++] = (*to) ? *to++ : (char) 0;
|
|
|
|
while (*src) {
|
|
sch = *src++;
|
|
dch = mapvec[sch];
|
|
while (dch != sch) {
|
|
sch = dch;
|
|
dch = mapvec[sch];
|
|
}
|
|
if (*dest = dch)
|
|
dest++;
|
|
}
|
|
/*
|
|
* restore all the changed characters
|
|
*/
|
|
while (*tmp) {
|
|
mapvec[*tmp] = *tmp;
|
|
tmp++;
|
|
}
|
|
}
|
|
*dest = (char) 0;
|
|
}
|