392 lines
9.6 KiB
C
392 lines
9.6 KiB
C
/* $NetBSD: for.c,v 1.26 2007/01/01 21:31:51 dsl Exp $ */
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/*
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* Copyright (c) 1992, The Regents of the University of California.
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* All rights reserved.
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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. 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 MAKE_NATIVE
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static char rcsid[] = "$NetBSD: for.c,v 1.26 2007/01/01 21:31:51 dsl Exp $";
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#else
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: for.c,v 1.26 2007/01/01 21:31:51 dsl Exp $");
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#endif
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#endif /* not lint */
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#endif
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/*-
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* for.c --
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* Functions to handle loops in a makefile.
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*
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* Interface:
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* For_Eval Evaluate the loop in the passed line.
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* For_Run Run accumulated loop
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*
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*/
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#include <assert.h>
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#include <ctype.h>
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#include "make.h"
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#include "hash.h"
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#include "dir.h"
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#include "buf.h"
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/*
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* For statements are of the form:
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*
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* .for <variable> in <varlist>
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* ...
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* .endfor
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*
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* The trick is to look for the matching end inside for for loop
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* To do that, we count the current nesting level of the for loops.
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* and the .endfor statements, accumulating all the statements between
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* the initial .for loop and the matching .endfor;
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* then we evaluate the for loop for each variable in the varlist.
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*
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* Note that any nested fors are just passed through; they get handled
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* recursively in For_Eval when we're expanding the enclosing for in
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* For_Run.
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*/
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static int forLevel = 0; /* Nesting level */
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/*
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* State of a for loop.
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*/
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typedef struct _For {
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Buffer buf; /* Body of loop */
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char **vars; /* Iteration variables */
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int nvars; /* # of iteration vars */
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Lst lst; /* List of items */
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} For;
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static For accumFor; /* Loop being accumulated */
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static void ForAddVar(const char *, size_t);
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/*-
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*-----------------------------------------------------------------------
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* ForAddVar --
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* Add an iteration variable to the currently accumulating for.
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*
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* Results: none
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* Side effects: no additional side effects.
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*-----------------------------------------------------------------------
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*/
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static void
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ForAddVar(const char *data, size_t len)
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{
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Buffer buf;
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int varlen;
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buf = Buf_Init(0);
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Buf_AddBytes(buf, len, (Byte *)UNCONST(data));
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accumFor.nvars++;
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accumFor.vars = erealloc(accumFor.vars, accumFor.nvars*sizeof(char *));
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accumFor.vars[accumFor.nvars-1] = (char *)Buf_GetAll(buf, &varlen);
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Buf_Destroy(buf, FALSE);
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}
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/*-
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*-----------------------------------------------------------------------
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* For_Eval --
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* Evaluate the for loop in the passed line. The line
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* looks like this:
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* .for <variable> in <varlist>
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*
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* Input:
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* line Line to parse
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*
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* Results:
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* TRUE: We found a for loop, or we are inside a for loop
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* FALSE: We did not find a for loop, or we found the end of the for
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* for loop.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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int
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For_Eval(char *line)
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{
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char *ptr = line, *sub, *in, *wrd;
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int level; /* Level at which to report errors. */
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level = PARSE_FATAL;
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if (forLevel == 0) {
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Buffer buf;
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int varlen;
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static const char instr[] = "in";
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for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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/*
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* If we are not in a for loop quickly determine if the statement is
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* a for.
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*/
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if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
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!isspace((unsigned char) ptr[3]))
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return FALSE;
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ptr += 3;
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/*
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* we found a for loop, and now we are going to parse it.
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*/
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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/*
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* Find the "in".
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*/
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for (in = ptr; *in; in++) {
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if (isspace((unsigned char) in[0]) && in[1]== 'i' &&
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in[2] == 'n' &&
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(in[3] == '\0' || isspace((unsigned char) in[3])))
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break;
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}
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if (*in == '\0') {
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Parse_Error(level, "missing `in' in for");
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return 0;
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}
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/*
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* Grab the variables.
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*/
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accumFor.vars = NULL;
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while (ptr < in) {
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wrd = ptr;
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while (*ptr && !isspace((unsigned char) *ptr))
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ptr++;
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ForAddVar(wrd, ptr - wrd);
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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}
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if (accumFor.nvars == 0) {
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Parse_Error(level, "no iteration variables in for");
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return 0;
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}
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/* At this point we should be pointing right at the "in" */
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/*
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* compensate for hp/ux's brain damaged assert macro that
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* does not handle double quotes nicely.
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*/
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assert(!memcmp(ptr, instr, 2));
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ptr += 2;
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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/*
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* Make a list with the remaining words
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*/
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accumFor.lst = Lst_Init(FALSE);
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buf = Buf_Init(0);
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sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
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#define ADDWORD() \
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Buf_AddBytes(buf, ptr - wrd, (Byte *)wrd), \
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Buf_AddByte(buf, (Byte)'\0'), \
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Lst_AtFront(accumFor.lst, Buf_GetAll(buf, &varlen)), \
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Buf_Destroy(buf, FALSE)
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for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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for (wrd = ptr; *ptr; ptr++)
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if (isspace((unsigned char) *ptr)) {
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ADDWORD();
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buf = Buf_Init(0);
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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wrd = ptr--;
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}
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if (DEBUG(FOR)) {
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int i;
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for (i = 0; i < accumFor.nvars; i++) {
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(void)fprintf(debug_file, "For: variable %s\n", accumFor.vars[i]);
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}
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(void)fprintf(debug_file, "For: list %s\n", sub);
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}
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if (ptr - wrd > 0)
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ADDWORD();
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else
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Buf_Destroy(buf, TRUE);
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free(sub);
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accumFor.buf = Buf_Init(0);
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forLevel++;
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return 1;
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}
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if (*ptr == '.') {
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for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
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continue;
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if (strncmp(ptr, "endfor", 6) == 0 &&
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(isspace((unsigned char) ptr[6]) || !ptr[6])) {
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if (DEBUG(FOR))
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(void)fprintf(debug_file, "For: end for %d\n", forLevel);
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if (--forLevel < 0) {
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Parse_Error(level, "for-less endfor");
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return 0;
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}
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} else if (strncmp(ptr, "for", 3) == 0 &&
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isspace((unsigned char) ptr[3])) {
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forLevel++;
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if (DEBUG(FOR))
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(void)fprintf(debug_file, "For: new loop %d\n", forLevel);
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}
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}
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if (forLevel != 0) {
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Buf_AddBytes(accumFor.buf, strlen(line), (Byte *)line);
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Buf_AddByte(accumFor.buf, (Byte)'\n');
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return 1;
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}
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return 0;
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}
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/*-
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*-----------------------------------------------------------------------
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* For_Run --
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* Run the for loop, imitating the actions of an include file
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*
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* Results:
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* None.
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*
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* Side Effects:
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* None.
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*
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*-----------------------------------------------------------------------
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*/
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void
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For_Run(int lineno)
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{
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For arg;
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LstNode ln;
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char **values;
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int i, done = 0, len;
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char *guy, *orig_guy, *old_guy;
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if (accumFor.buf == NULL || accumFor.vars == NULL || accumFor.lst == NULL)
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return;
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arg = accumFor;
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accumFor.buf = NULL;
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accumFor.vars = NULL;
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accumFor.nvars = 0;
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accumFor.lst = NULL;
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if (Lst_Open(arg.lst) != SUCCESS)
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return;
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values = emalloc(arg.nvars * sizeof(char *));
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while (!done) {
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/*
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* due to the dumb way this is set up, this loop must run
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* backwards.
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*/
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for (i = arg.nvars - 1; i >= 0; i--) {
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ln = Lst_Next(arg.lst);
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if (ln == NILLNODE) {
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if (i != arg.nvars-1) {
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Parse_Error(PARSE_FATAL,
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"Not enough words in for substitution list");
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}
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done = 1;
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break;
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} else {
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values[i] = (char *)Lst_Datum(ln);
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}
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}
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if (done)
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break;
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for (i = 0; i < arg.nvars; i++) {
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Var_Set(arg.vars[i], values[i], VAR_GLOBAL, 0);
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if (DEBUG(FOR))
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(void)fprintf(debug_file, "--- %s = %s\n", arg.vars[i],
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values[i]);
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}
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/*
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* Hack, hack, kludge.
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* This is really ugly, but to do it any better way would require
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* making major changes to var.c, which I don't want to get into
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* yet. There is no mechanism for expanding some variables, only
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* for expanding a single variable. That should be corrected, but
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* not right away. (XXX)
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*/
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guy = (char *)Buf_GetAll(arg.buf, &len);
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orig_guy = guy;
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for (i = 0; i < arg.nvars; i++) {
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old_guy = guy;
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guy = Var_Subst(arg.vars[i], guy, VAR_GLOBAL, FALSE);
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if (old_guy != orig_guy)
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free(old_guy);
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}
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Parse_SetInput(NULL, lineno, -1, guy);
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for (i = 0; i < arg.nvars; i++)
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Var_Delete(arg.vars[i], VAR_GLOBAL);
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}
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free(values);
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Lst_Close(arg.lst);
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for (i=0; i<arg.nvars; i++) {
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free(arg.vars[i]);
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}
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free(arg.vars);
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Lst_Destroy(arg.lst, (FreeProc *)free);
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Buf_Destroy(arg.buf, TRUE);
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}
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