NetBSD/usr.bin/make/for.c

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/*
* Copyright (c) 1992, The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
/* from: static char sccsid[] = "@(#)for.c 5.6 (Berkeley) 6/1/90"; */
static char *rcsid = "$Id: for.c,v 1.2 1994/06/06 22:45:28 jtc Exp $";
#endif /* not lint */
/*-
* 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 "make.h"
#include "hash.h"
#include "dir.h"
#include "buf.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 */
/*
* State of a for loop.
*/
typedef struct _For {
Buffer buf; /* Unexpanded buffer */
char* var; /* Index name */
Lst lst; /* List of variables */
} For;
static int ForExec __P((ClientData, ClientData));
/*-
*-----------------------------------------------------------------------
* For_Eval --
* Evaluate the for loop in the passed line. The line
* looks like this:
* .for <variable> in <varlist>
*
* Results:
* TRUE: We found a for loop, or we are inside a for loop
* FALSE: We did not find a for loop, or we found the end of the for
* for loop.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
int
For_Eval (line)
char *line; /* Line to parse */
{
char *ptr = line, *sub, *wrd;
int level; /* Level at which to report errors. */
level = PARSE_FATAL;
if (forLevel == 0) {
Buffer buf;
int varlen;
for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
continue;
/*
* If we are not in a for loop quickly determine if the statement is
* a for.
*/
if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
!isspace((unsigned char) ptr[3]))
return FALSE;
ptr += 3;
/*
* we found a for loop, and now we are going to parse it.
*/
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
/*
* Grab the variable
*/
buf = Buf_Init(0);
for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
continue;
Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd);
forVar = (char *) Buf_GetAll(buf, &varlen);
if (varlen == 0) {
Parse_Error (level, "missing variable in for");
return 0;
}
Buf_Destroy(buf, FALSE);
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
/*
* Grab the `in'
*/
if (ptr[0] != 'i' || ptr[1] != 'n' ||
!isspace((unsigned char) ptr[2])) {
Parse_Error (level, "missing `in' in for");
printf("%s\n", ptr);
return 0;
}
ptr += 3;
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
/*
* Make a list with the remaining words
*/
forLst = Lst_Init(FALSE);
buf = Buf_Init(0);
sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
#define ADDWORD() \
Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
Buf_AddByte(buf, (Byte) '\0'), \
Lst_AtEnd(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \
Buf_Destroy(buf, FALSE)
for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
continue;
for (wrd = ptr; *ptr; ptr++)
if (isspace((unsigned char) *ptr)) {
ADDWORD();
buf = Buf_Init(0);
while (*ptr && isspace((unsigned char) *ptr))
ptr++;
wrd = ptr--;
}
if (DEBUG(FOR))
(void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
if (ptr - wrd > 0)
ADDWORD();
else
Buf_Destroy(buf, TRUE);
free((Address) sub);
forBuf = Buf_Init(0);
forLevel++;
return 1;
}
else if (*ptr == '.') {
for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
continue;
if (strncmp(ptr, "endfor", 6) == 0 &&
(isspace((unsigned char) ptr[6]) || !ptr[6])) {
if (DEBUG(FOR))
(void) fprintf(stderr, "For: end for %d\n", forLevel);
if (--forLevel < 0) {
Parse_Error (level, "for-less endfor");
return 0;
}
}
else if (strncmp(ptr, "for", 3) == 0 &&
isspace((unsigned char) ptr[3])) {
forLevel++;
if (DEBUG(FOR))
(void) fprintf(stderr, "For: new loop %d\n", forLevel);
}
}
if (forLevel != 0) {
Buf_AddBytes(forBuf, strlen(line), (Byte *) line);
Buf_AddByte(forBuf, (Byte) '\n');
return 1;
}
else {
return 0;
}
}
/*-
*-----------------------------------------------------------------------
* ForExec --
* Expand the for loop for this index and push it in the Makefile
*
* Results:
* None.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
static int
ForExec(namep, argp)
ClientData namep;
ClientData argp;
{
char *name = (char *) namep;
For *arg = (For *) argp;
int len;
Var_Set(arg->var, name, VAR_GLOBAL);
if (DEBUG(FOR))
(void) fprintf(stderr, "--- %s = %s\n", arg->var, name);
Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len),
VAR_GLOBAL, FALSE));
Var_Delete(arg->var, VAR_GLOBAL);
return 0;
}
/*-
*-----------------------------------------------------------------------
* For_Run --
* Run the for loop, immitating the actions of an include file
*
* Results:
* None.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
void
For_Run()
{
For arg;
if (forVar == NULL || forBuf == NULL || forLst == NULL)
return;
arg.var = forVar;
arg.buf = forBuf;
arg.lst = forLst;
forVar = NULL;
forBuf = NULL;
forLst = NULL;
Lst_ForEach(arg.lst, ForExec, (ClientData) &arg);
free((Address)arg.var);
Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free);
Buf_Destroy(arg.buf, TRUE);
}