/*-
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)for.c 8.1 (Berkeley) 6/6/93
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* for.c --
* Functions to handle loops in a makefile.
*
* Interface:
* For_Eval Evaluate the loop in the passed line.
* For_Run Run accumulated loop
*
*/
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "buf.h"
#include "dir.h"
#include "for.h"
#include "globals.h"
#include "lst.h"
#include "make.h"
#include "parse.h"
#include "util.h"
#include "var.h"
/*
* For statements are of the form:
*
* .for <variable> in <varlist>
* ...
* .endfor
*
* The trick is to look for the matching end inside for for loop
* To do that, we count the current nesting level of the for loops.
* and the .endfor statements, accumulating all the statements between
* the initial .for loop and the matching .endfor;
* then we evaluate the for loop for each variable in the varlist.
*/
static int forLevel = 0; /* Nesting level */
static char *forVar; /* Iteration variable */
static Buffer *forBuf; /* Commands in loop */
static Lst forLst; /* List of items */
/**
* For_For
* Evaluate the for loop in the passed line. The line
* looks like this:
* .for <variable> in <varlist>
* The line pointer points just behind the for.
*
* Results:
* TRUE: Syntax ok.
* FALSE: Syntax error.
*/
Boolean
For_For(char *line)
{
char *ptr;
char *wrd;
char *sub;
Buffer *buf;
size_t varlen;
ptr = line;
/*
* Skip space between for and the variable.
*/
for (ptr++; *ptr && isspace((u_char)*ptr); ptr++)
;
/*
* Grab the variable
*/
for (wrd = ptr; *ptr && !isspace((u_char)*ptr); ptr++)
;
buf = Buf_Init(0);
Buf_AppendRange(buf, wrd, ptr);
forVar = Buf_GetAll(buf, &varlen);
if (varlen == 0) {
Buf_Destroy(buf, TRUE);
Parse_Error(PARSE_FATAL, "missing variable in for");
return (FALSE);
}
Buf_Destroy(buf, FALSE);
/*
* Skip to 'in'.
*/
while (*ptr && isspace((u_char)*ptr))
ptr++;
/*
* Grab the `in'
*/
if (ptr[0] != 'i' || ptr[1] != 'n' || !isspace((u_char)ptr[2])) {
free(forVar);
Parse_Error(PARSE_FATAL, "missing `in' in for");
fprintf(stderr, "%s\n", ptr);
return (FALSE);
}
ptr += 3;
/*
* Skip to values
*/
while (*ptr && isspace((u_char)*ptr))
ptr++;
/*
* Make a list with the remaining words
* XXX should use brk_string here.
*/
sub = Buf_Peel(Var_Subst(ptr, VAR_CMD, FALSE));
for (ptr = sub; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
;
Lst_Init(&forLst);
buf = Buf_Init(0);
for (wrd = ptr; *ptr != '\0'; ptr++) {
if (isspace((u_char)*ptr)) {
Buf_AppendRange(buf, wrd, ptr);
Lst_AtFront(&forLst, Buf_Peel(buf));
buf = Buf_Init(0);
while (*ptr != '\0' && isspace((u_char)*ptr))
ptr++;
wrd = ptr--;
}
}
DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
if (ptr - wrd > 0) {
Buf_AppendRange(buf, wrd, ptr);
Lst_AtFront(&forLst, Buf_Peel(buf));
} else {
Buf_Destroy(buf, TRUE);
}
free(sub);
forBuf = Buf_Init(0);
forLevel++;
return (TRUE);
}
/**
* For_Eval
* Eat a line of the .for body looking for embedded .for loops
* and the .endfor
*/
Boolean
For_Eval(char *line)
{
char *ptr;
ptr = line;
if (*ptr == '.') {
/*
* Need to check for 'endfor' and 'for' to find the end
* of our loop or to find embedded for loops.
*/
for (ptr++; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
;
/* XXX the isspace is wrong */
if (strncmp(ptr, "endfor", 6) == 0 &&
(isspace((u_char)ptr[6]) || ptr[6] == '\0')) {
DEBUGF(FOR, ("For: end for %d\n", forLevel));
if (forLevel == 0) {
/* should not be here */
abort();
}
forLevel--;
} else if (strncmp(ptr, "for", 3) == 0 &&
isspace((u_char)ptr[3])) {
forLevel++;
DEBUGF(FOR, ("For: new loop %d\n", forLevel));
}
}
if (forLevel != 0) {
/*
* Still in loop - append the line
*/
Buf_Append(forBuf, line);
Buf_AddByte(forBuf, (Byte)'\n');
return (TRUE);
}
return (FALSE);
}
/*-
*-----------------------------------------------------------------------
* For_Run --
* Run the for loop, immitating the actions of an include file
*
* Results:
* None.
*
* Side Effects:
* The values of the variables forLst, forVar and forBuf are freed.
*
*-----------------------------------------------------------------------
*/
void
For_Run(int lineno)
{
Lst values; /* list of values for the variable */
char *var; /* the variable's name */
Buffer *buf; /* the contents of the for loop */
const char *val; /* current value of loop variable */
LstNode *ln;
char *str;
if (forVar == NULL || forBuf == NULL)
return;
/* copy the global variables to have them free for embedded fors */
var = forVar;
buf = forBuf;
Lst_Init(&values);
Lst_Concat(&values, &forLst, LST_CONCLINK);
forVar = NULL;
forBuf = NULL;
LST_FOREACH(ln, &values) {
val = Lst_Datum(ln);
Var_Set(var, val, VAR_GLOBAL);
DEBUGF(FOR, ("--- %s = %s\n", var, val));
str = Buf_Peel(Var_SubstOnly(var, Buf_Data(buf), FALSE));
Parse_FromString(str, lineno);
Var_Delete(var, VAR_GLOBAL);
}
free(var);
Lst_Destroy(&values, free);
Buf_Destroy(buf, TRUE);
}
