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497 lines
12 KiB
C
497 lines
12 KiB
C
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/* $NetBSD: for.c,v 1.49 2012/06/03 04:29:40 sjg 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 1.49 2012/06/03 04:29:40 sjg 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 1.49 2012/06/03 04:29:40 sjg 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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#include "strlist.h"
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#define FOR_SUB_ESCAPE_CHAR 1
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#define FOR_SUB_ESCAPE_BRACE 2
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#define FOR_SUB_ESCAPE_PAREN 4
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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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strlist_t vars; /* Iteration variables */
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strlist_t items; /* Substitution items */
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char *parse_buf;
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int short_var;
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int sub_next;
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} For;
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static For *accumFor; /* Loop being accumulated */
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static char *
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make_str(const char *ptr, int len)
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{
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char *new_ptr;
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new_ptr = bmake_malloc(len + 1);
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memcpy(new_ptr, ptr, len);
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new_ptr[len] = 0;
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return new_ptr;
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}
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static void
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For_Free(For *arg)
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{
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Buf_Destroy(&arg->buf, TRUE);
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strlist_clean(&arg->vars);
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strlist_clean(&arg->items);
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free(arg->parse_buf);
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free(arg);
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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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* 0: Not a .for statement, parse the line
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* 1: We found a for loop
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* -1: A .for statement with a bad syntax error, discard.
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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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For *new_for;
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char *ptr = line, *sub;
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int len;
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int escapes;
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unsigned char ch;
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char **words, *word_buf;
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int n, nwords;
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/* Skip the '.' and any following whitespace */
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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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if (ptr[0] == 'e' && strncmp(ptr+1, "ndfor", 5) == 0) {
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Parse_Error(PARSE_FATAL, "for-less endfor");
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return -1;
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}
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return 0;
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}
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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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new_for = bmake_malloc(sizeof *new_for);
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memset(new_for, 0, sizeof *new_for);
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/* Grab the variables. Terminate on "in". */
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for (;; ptr += len) {
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while (*ptr && isspace((unsigned char) *ptr))
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ptr++;
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if (*ptr == '\0') {
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Parse_Error(PARSE_FATAL, "missing `in' in for");
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For_Free(new_for);
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return -1;
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}
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for (len = 1; ptr[len] && !isspace((unsigned char)ptr[len]); len++)
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continue;
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if (len == 2 && ptr[0] == 'i' && ptr[1] == 'n') {
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ptr += 2;
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break;
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}
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if (len == 1)
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new_for->short_var = 1;
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strlist_add_str(&new_for->vars, make_str(ptr, len), len);
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}
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if (strlist_num(&new_for->vars) == 0) {
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Parse_Error(PARSE_FATAL, "no iteration variables in for");
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For_Free(new_for);
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return -1;
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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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* Make a list with the remaining words
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* The values are substituted as ${:U<value>...} so we must \ escape
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* characters that break that syntax.
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* Variables are fully expanded - so it is safe for escape $.
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* We can't do the escapes here - because we don't know whether
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* we are substuting into ${...} or $(...).
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*/
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sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
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/*
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* Split into words allowing for quoted strings.
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*/
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words = brk_string(sub, &nwords, FALSE, &word_buf);
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free(sub);
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if (words != NULL) {
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for (n = 0; n < nwords; n++) {
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ptr = words[n];
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if (!*ptr)
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continue;
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escapes = 0;
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while ((ch = *ptr++)) {
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switch(ch) {
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case ':':
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case '$':
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case '\\':
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escapes |= FOR_SUB_ESCAPE_CHAR;
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break;
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case ')':
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escapes |= FOR_SUB_ESCAPE_PAREN;
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break;
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case /*{*/ '}':
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escapes |= FOR_SUB_ESCAPE_BRACE;
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break;
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}
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}
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/*
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* We have to dup words[n] to maintain the semantics of
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* strlist.
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*/
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strlist_add_str(&new_for->items, bmake_strdup(words[n]), escapes);
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}
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free(words);
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free(word_buf);
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if ((len = strlist_num(&new_for->items)) > 0 &&
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len % (n = strlist_num(&new_for->vars))) {
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Parse_Error(PARSE_FATAL,
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"Wrong number of words (%d) in .for substitution list"
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" with %d vars", len, n);
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/*
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* Return 'success' so that the body of the .for loop is
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* accumulated.
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* Remove all items so that the loop doesn't iterate.
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*/
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strlist_clean(&new_for->items);
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}
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}
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Buf_Init(&new_for->buf, 0);
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accumFor = new_for;
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forLevel = 1;
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return 1;
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}
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/*
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* Add another line to a .for loop.
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* Returns 0 when the matching .endfor is reached.
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*/
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int
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For_Accum(char *line)
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{
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char *ptr = line;
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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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return 0;
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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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Buf_AddBytes(&accumFor->buf, strlen(line), line);
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Buf_AddByte(&accumFor->buf, '\n');
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return 1;
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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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static int
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for_var_len(const char *var)
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{
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char ch, var_start, var_end;
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int depth;
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int len;
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var_start = *var;
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if (var_start == 0)
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/* just escape the $ */
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return 0;
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if (var_start == '(')
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var_end = ')';
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else if (var_start == '{')
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var_end = '}';
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else
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/* Single char variable */
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return 1;
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depth = 1;
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for (len = 1; (ch = var[len++]) != 0;) {
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if (ch == var_start)
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depth++;
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else if (ch == var_end && --depth == 0)
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return len;
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}
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/* Variable end not found, escape the $ */
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return 0;
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}
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static void
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for_substitute(Buffer *cmds, strlist_t *items, unsigned int item_no, char ech)
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{
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const char *item = strlist_str(items, item_no);
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int len;
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char ch;
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/* If there were no escapes, or the only escape is the other variable
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* terminator, then just substitute the full string */
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if (!(strlist_info(items, item_no) &
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(ech == ')' ? ~FOR_SUB_ESCAPE_BRACE : ~FOR_SUB_ESCAPE_PAREN))) {
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Buf_AddBytes(cmds, strlen(item), item);
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return;
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}
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/* Escape ':', '$', '\\' and 'ech' - removed by :U processing */
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|
|
while ((ch = *item++) != 0) {
|
|||
|
|
if (ch == '$') {
|
|||
|
|
len = for_var_len(item);
|
|||
|
|
if (len != 0) {
|
|||
|
|
Buf_AddBytes(cmds, len + 1, item - 1);
|
|||
|
|
item += len;
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
Buf_AddByte(cmds, '\\');
|
|||
|
|
} else if (ch == ':' || ch == '\\' || ch == ech)
|
|||
|
|
Buf_AddByte(cmds, '\\');
|
|||
|
|
Buf_AddByte(cmds, ch);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
static char *
|
|||
|
|
For_Iterate(void *v_arg, size_t *ret_len)
|
|||
|
|
{
|
|||
|
|
For *arg = v_arg;
|
|||
|
|
int i, len;
|
|||
|
|
char *var;
|
|||
|
|
char *cp;
|
|||
|
|
char *cmd_cp;
|
|||
|
|
char *body_end;
|
|||
|
|
char ch;
|
|||
|
|
Buffer cmds;
|
|||
|
|
|
|||
|
|
if (arg->sub_next + strlist_num(&arg->vars) > strlist_num(&arg->items)) {
|
|||
|
|
/* No more iterations */
|
|||
|
|
For_Free(arg);
|
|||
|
|
return NULL;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
free(arg->parse_buf);
|
|||
|
|
arg->parse_buf = NULL;
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Scan the for loop body and replace references to the loop variables
|
|||
|
|
* with variable references that expand to the required text.
|
|||
|
|
* Using variable expansions ensures that the .for loop can't generate
|
|||
|
|
* syntax, and that the later parsing will still see a variable.
|
|||
|
|
* We assume that the null variable will never be defined.
|
|||
|
|
*
|
|||
|
|
* The detection of substitions of the loop control variable is naive.
|
|||
|
|
* Many of the modifiers use \ to escape $ (not $) so it is possible
|
|||
|
|
* to contrive a makefile where an unwanted substitution happens.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
cmd_cp = Buf_GetAll(&arg->buf, &len);
|
|||
|
|
body_end = cmd_cp + len;
|
|||
|
|
Buf_Init(&cmds, len + 256);
|
|||
|
|
for (cp = cmd_cp; (cp = strchr(cp, '$')) != NULL;) {
|
|||
|
|
char ech;
|
|||
|
|
ch = *++cp;
|
|||
|
|
if ((ch == '(' && (ech = ')')) || (ch == '{' && (ech = '}'))) {
|
|||
|
|
cp++;
|
|||
|
|
/* Check variable name against the .for loop variables */
|
|||
|
|
STRLIST_FOREACH(var, &arg->vars, i) {
|
|||
|
|
len = strlist_info(&arg->vars, i);
|
|||
|
|
if (memcmp(cp, var, len) != 0)
|
|||
|
|
continue;
|
|||
|
|
if (cp[len] != ':' && cp[len] != ech && cp[len] != '\\')
|
|||
|
|
continue;
|
|||
|
|
/* Found a variable match. Replace with :U<value> */
|
|||
|
|
Buf_AddBytes(&cmds, cp - cmd_cp, cmd_cp);
|
|||
|
|
Buf_AddBytes(&cmds, 2, ":U");
|
|||
|
|
cp += len;
|
|||
|
|
cmd_cp = cp;
|
|||
|
|
for_substitute(&cmds, &arg->items, arg->sub_next + i, ech);
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
if (ch == 0)
|
|||
|
|
break;
|
|||
|
|
/* Probably a single character name, ignore $$ and stupid ones. {*/
|
|||
|
|
if (!arg->short_var || strchr("}):$", ch) != NULL) {
|
|||
|
|
cp++;
|
|||
|
|
continue;
|
|||
|
|
}
|
|||
|
|
STRLIST_FOREACH(var, &arg->vars, i) {
|
|||
|
|
if (var[0] != ch || var[1] != 0)
|
|||
|
|
continue;
|
|||
|
|
/* Found a variable match. Replace with ${:U<value>} */
|
|||
|
|
Buf_AddBytes(&cmds, cp - cmd_cp, cmd_cp);
|
|||
|
|
Buf_AddBytes(&cmds, 3, "{:U");
|
|||
|
|
cmd_cp = ++cp;
|
|||
|
|
for_substitute(&cmds, &arg->items, arg->sub_next + i, /*{*/ '}');
|
|||
|
|
Buf_AddBytes(&cmds, 1, "}");
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
Buf_AddBytes(&cmds, body_end - cmd_cp, cmd_cp);
|
|||
|
|
|
|||
|
|
cp = Buf_Destroy(&cmds, FALSE);
|
|||
|
|
if (DEBUG(FOR))
|
|||
|
|
(void)fprintf(debug_file, "For: loop body:\n%s", cp);
|
|||
|
|
|
|||
|
|
arg->sub_next += strlist_num(&arg->vars);
|
|||
|
|
|
|||
|
|
arg->parse_buf = cp;
|
|||
|
|
*ret_len = strlen(cp);
|
|||
|
|
return cp;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void
|
|||
|
|
For_Run(int lineno)
|
|||
|
|
{
|
|||
|
|
For *arg;
|
|||
|
|
|
|||
|
|
arg = accumFor;
|
|||
|
|
accumFor = NULL;
|
|||
|
|
|
|||
|
|
if (strlist_num(&arg->items) == 0) {
|
|||
|
|
/* Nothing to expand - possibly due to an earlier syntax error. */
|
|||
|
|
For_Free(arg);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
Parse_SetInput(NULL, lineno, -1, For_Iterate, arg);
|
|||
|
|
}
|