File: [local] / src / usr.bin / make / for.c (download)
Revision 1.7, Mon Dec 6 22:24:31 1999 UTC (24 years, 6 months ago) by espie
Branch: MAIN
Changes since 1.6: +5 -6 lines
Clean up buffers interface somewhat:
- buf.c deals exclusively with chars. Be explicit about it, and remove
extraneous dumb casts to char (can hide real type errors).
- buffer sizes are size_t. Note that bp->left can never become NULL.
- Buf_GetAll is happy with a NULL pointer for the size, remove unneeded
extra pointers.
- Propagate size_t to all places where buffer functions are used.
|
/* $OpenBSD: for.c,v 1.7 1999/12/06 22:24:31 espie Exp $ */
/* $NetBSD: for.c,v 1.4 1996/11/06 17:59:05 christos Exp $ */
/*
* Copyright (c) 1999 Marc Espie.
*
* Extensive code modifications for the OpenBSD project.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
* PROJECT 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.
*/
/*
* 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
#if 0
static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: for.c,v 1.7 1999/12/06 22:24:31 espie Exp $";
#endif
#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 */
static unsigned long forLineno; /* Line at beginning of loop */
/*
* State of a for loop.
*/
typedef struct _For {
Buffer buf; /* Unexpanded buffer */
char* var; /* Index name */
Lst lst; /* List of variables */
unsigned long lineno;
} For;
static int ForExec __P((ClientData, ClientData));
static void build_words_list __P((Lst, const char *));
/* Cut a string into words, stuff that into list. */
static void
build_words_list(lst, s)
Lst lst;
const char *s;
{
const char *wrd;
for (;;) {
for (; *s != '\0' && isspace(*s); s++)
continue;
if (*s == '\0')
break;
for (wrd = s; *s != '\0' && !isspace(*s); s++)
continue;
/* note that we fill the list backward, since
* Parse_FromString stacks strings. */
Lst_AtFront(lst, (ClientData)interval_dup(wrd, s));
}
}
/*-
*-----------------------------------------------------------------------
* 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;
int level; /* Level at which to report errors. */
level = PARSE_FATAL;
if (forLevel == 0) {
char *endVar;
char *sub;
char *wrd;
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. */
for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
continue;
if (ptr - wrd == 0) {
Parse_Error(level, "missing variable in for");
return 0;
}
endVar = ptr++;
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;
/* .for loop is go, collate what we need. */
forVar = interval_dup(wrd, endVar);
/* Make a list with the remaining words. */
sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
if (DEBUG(FOR))
(void)fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
forLst = Lst_Init(FALSE);
build_words_list(forLst, sub);
free(sub);
forLineno = Parse_Getlineno();
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_AddChars(forBuf, strlen(line), line);
Buf_AddChar(forBuf, '\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;
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, Buf_GetAll(arg->buf, NULL),
VAR_GLOBAL, FALSE), arg->lineno);
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;
arg.lineno = forLineno;
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);
}