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512be259a7
Reviewed by: rodrigc
268 lines
6.3 KiB
C
268 lines
6.3 KiB
C
/*-
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* Copyright (c) 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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* Christos Zoulas.
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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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* @(#)for.c 8.1 (Berkeley) 6/6/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "buf.h"
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#include "for.h"
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#include "globals.h"
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#include "lst.h"
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#include "parse.h"
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#include "str.h"
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#include "util.h"
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#include "var.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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static int forLevel = 0; /* Nesting level */
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static char *forVar; /* Iteration variable */
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static Buffer *forBuf; /* Commands in loop */
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static Lst forLst; /* List of items */
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/**
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* For_For
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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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* The line pointer points just behind the for.
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*
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* Results:
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* TRUE: Syntax ok.
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* FALSE: Syntax error.
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*/
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Boolean
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For_For(char *line)
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{
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char *ptr;
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char *wrd;
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char *sub;
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Buffer *buf;
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size_t varlen;
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int i;
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ArgArray words;
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ptr = line;
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/*
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* Skip space between for and the variable.
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*/
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for (ptr++; *ptr && isspace((u_char)*ptr); ptr++)
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;
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/*
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* Grab the variable
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*/
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for (wrd = ptr; *ptr && !isspace((u_char)*ptr); ptr++)
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;
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buf = Buf_Init(0);
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Buf_AppendRange(buf, wrd, ptr);
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forVar = Buf_GetAll(buf, &varlen);
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if (varlen == 0) {
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Buf_Destroy(buf, TRUE);
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Parse_Error(PARSE_FATAL, "missing variable in for");
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return (FALSE);
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}
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Buf_Destroy(buf, FALSE);
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/*
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* Skip to 'in'.
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*/
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while (*ptr && isspace((u_char)*ptr))
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ptr++;
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/*
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* Grab the `in'
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*/
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if (ptr[0] != 'i' || ptr[1] != 'n' || !isspace((u_char)ptr[2])) {
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free(forVar);
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Parse_Error(PARSE_FATAL, "missing `in' in for");
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fprintf(stderr, "%s\n", ptr);
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return (FALSE);
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}
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ptr += 3;
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/*
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* Skip to values
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*/
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while (*ptr && isspace((u_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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sub = Buf_Peel(Var_Subst(ptr, VAR_CMD, FALSE));
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brk_string(&words, sub, FALSE);
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Lst_Init(&forLst);
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for (i = 1; i < words.argc; i++) {
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if (words.argv[i][0] != '\0')
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Lst_AtFront(&forLst, estrdup(words.argv[i]));
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}
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ArgArray_Done(&words);
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DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
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free(sub);
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forBuf = Buf_Init(0);
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forLevel++;
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return (TRUE);
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}
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/**
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* For_Eval
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* Eat a line of the .for body looking for embedded .for loops
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* and the .endfor
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*/
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Boolean
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For_Eval(char *line)
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{
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char *ptr;
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ptr = line;
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if (*ptr == '.') {
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/*
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* Need to check for 'endfor' and 'for' to find the end
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* of our loop or to find embedded for loops.
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*/
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for (ptr++; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
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;
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/* XXX the isspace is wrong */
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if (strncmp(ptr, "endfor", 6) == 0 &&
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(isspace((u_char)ptr[6]) || ptr[6] == '\0')) {
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DEBUGF(FOR, ("For: end for %d\n", forLevel));
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if (forLevel == 0) {
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/* should not be here */
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abort();
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}
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forLevel--;
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} else if (strncmp(ptr, "for", 3) == 0 &&
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isspace((u_char)ptr[3])) {
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forLevel++;
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DEBUGF(FOR, ("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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/*
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* Still in loop - append the line
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*/
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Buf_Append(forBuf, line);
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Buf_AddByte(forBuf, (Byte)'\n');
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return (TRUE);
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}
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return (FALSE);
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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, immitating 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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* The values of the variables forLst, forVar and forBuf are freed.
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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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Lst values; /* list of values for the variable */
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char *var; /* the variable's name */
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Buffer *buf; /* the contents of the for loop */
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const char *val; /* current value of loop variable */
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LstNode *ln;
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char *str;
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if (forVar == NULL || forBuf == NULL)
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return;
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/* copy the global variables to have them free for embedded fors */
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var = forVar;
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buf = forBuf;
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Lst_Init(&values);
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Lst_Concat(&values, &forLst, LST_CONCLINK);
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forVar = NULL;
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forBuf = NULL;
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LST_FOREACH(ln, &values) {
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val = Lst_Datum(ln);
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Var_SetGlobal(var, val);
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DEBUGF(FOR, ("--- %s = %s\n", var, val));
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str = Buf_Peel(Var_SubstOnly(var, Buf_Data(buf), FALSE));
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Parse_FromString(str, lineno);
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Var_Delete(var, VAR_GLOBAL);
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}
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free(var);
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Lst_Destroy(&values, free);
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Buf_Destroy(buf, TRUE);
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}
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