1
/* $NetBSD: for.c,v 1.49 2012/06/03 04:29:40 sjg Exp $ */
4
* Copyright (c) 1992, The Regents of the University of California.
7
* Redistribution and use in source and binary forms, with or without
8
* modification, are permitted provided that the following conditions
10
* 1. Redistributions of source code must retain the above copyright
11
* notice, this list of conditions and the following disclaimer.
12
* 2. Redistributions in binary form must reproduce the above copyright
13
* notice, this list of conditions and the following disclaimer in the
14
* documentation and/or other materials provided with the distribution.
15
* 3. Neither the name of the University nor the names of its contributors
16
* may be used to endorse or promote products derived from this software
17
* without specific prior written permission.
19
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33
static char rcsid[] = "$NetBSD: for.c,v 1.49 2012/06/03 04:29:40 sjg Exp $";
35
#include <sys/cdefs.h>
38
static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93";
40
__RCSID("$NetBSD: for.c,v 1.49 2012/06/03 04:29:40 sjg Exp $");
47
* Functions to handle loops in a makefile.
50
* For_Eval Evaluate the loop in the passed line.
51
* For_Run Run accumulated loop
64
#define FOR_SUB_ESCAPE_CHAR 1
65
#define FOR_SUB_ESCAPE_BRACE 2
66
#define FOR_SUB_ESCAPE_PAREN 4
69
* For statements are of the form:
71
* .for <variable> in <varlist>
75
* The trick is to look for the matching end inside for for loop
76
* To do that, we count the current nesting level of the for loops.
77
* and the .endfor statements, accumulating all the statements between
78
* the initial .for loop and the matching .endfor;
79
* then we evaluate the for loop for each variable in the varlist.
81
* Note that any nested fors are just passed through; they get handled
82
* recursively in For_Eval when we're expanding the enclosing for in
86
static int forLevel = 0; /* Nesting level */
89
* State of a for loop.
92
Buffer buf; /* Body of loop */
93
strlist_t vars; /* Iteration variables */
94
strlist_t items; /* Substitution items */
100
static For *accumFor; /* Loop being accumulated */
105
make_str(const char *ptr, int len)
109
new_ptr = bmake_malloc(len + 1);
110
memcpy(new_ptr, ptr, len);
118
Buf_Destroy(&arg->buf, TRUE);
119
strlist_clean(&arg->vars);
120
strlist_clean(&arg->items);
121
free(arg->parse_buf);
127
*-----------------------------------------------------------------------
129
* Evaluate the for loop in the passed line. The line
131
* .for <variable> in <varlist>
137
* 0: Not a .for statement, parse the line
138
* 1: We found a for loop
139
* -1: A .for statement with a bad syntax error, discard.
144
*-----------------------------------------------------------------------
150
char *ptr = line, *sub;
154
char **words, *word_buf;
157
/* Skip the '.' and any following whitespace */
158
for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
162
* If we are not in a for loop quickly determine if the statement is
165
if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
166
!isspace((unsigned char) ptr[3])) {
167
if (ptr[0] == 'e' && strncmp(ptr+1, "ndfor", 5) == 0) {
168
Parse_Error(PARSE_FATAL, "for-less endfor");
176
* we found a for loop, and now we are going to parse it.
179
new_for = bmake_malloc(sizeof *new_for);
180
memset(new_for, 0, sizeof *new_for);
182
/* Grab the variables. Terminate on "in". */
183
for (;; ptr += len) {
184
while (*ptr && isspace((unsigned char) *ptr))
187
Parse_Error(PARSE_FATAL, "missing `in' in for");
191
for (len = 1; ptr[len] && !isspace((unsigned char)ptr[len]); len++)
193
if (len == 2 && ptr[0] == 'i' && ptr[1] == 'n') {
198
new_for->short_var = 1;
199
strlist_add_str(&new_for->vars, make_str(ptr, len), len);
202
if (strlist_num(&new_for->vars) == 0) {
203
Parse_Error(PARSE_FATAL, "no iteration variables in for");
208
while (*ptr && isspace((unsigned char) *ptr))
212
* Make a list with the remaining words
213
* The values are substituted as ${:U<value>...} so we must \ escape
214
* characters that break that syntax.
215
* Variables are fully expanded - so it is safe for escape $.
216
* We can't do the escapes here - because we don't know whether
217
* we are substuting into ${...} or $(...).
219
sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
222
* Split into words allowing for quoted strings.
224
words = brk_string(sub, &nwords, FALSE, &word_buf);
229
for (n = 0; n < nwords; n++) {
234
while ((ch = *ptr++)) {
239
escapes |= FOR_SUB_ESCAPE_CHAR;
242
escapes |= FOR_SUB_ESCAPE_PAREN;
245
escapes |= FOR_SUB_ESCAPE_BRACE;
250
* We have to dup words[n] to maintain the semantics of
253
strlist_add_str(&new_for->items, bmake_strdup(words[n]), escapes);
259
if ((len = strlist_num(&new_for->items)) > 0 &&
260
len % (n = strlist_num(&new_for->vars))) {
261
Parse_Error(PARSE_FATAL,
262
"Wrong number of words (%d) in .for substitution list"
263
" with %d vars", len, n);
265
* Return 'success' so that the body of the .for loop is
267
* Remove all items so that the loop doesn't iterate.
269
strlist_clean(&new_for->items);
273
Buf_Init(&new_for->buf, 0);
280
* Add another line to a .for loop.
281
* Returns 0 when the matching .endfor is reached.
285
For_Accum(char *line)
291
for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
294
if (strncmp(ptr, "endfor", 6) == 0 &&
295
(isspace((unsigned char) ptr[6]) || !ptr[6])) {
297
(void)fprintf(debug_file, "For: end for %d\n", forLevel);
300
} else if (strncmp(ptr, "for", 3) == 0 &&
301
isspace((unsigned char) ptr[3])) {
304
(void)fprintf(debug_file, "For: new loop %d\n", forLevel);
308
Buf_AddBytes(&accumFor->buf, strlen(line), line);
309
Buf_AddByte(&accumFor->buf, '\n');
315
*-----------------------------------------------------------------------
317
* Run the for loop, imitating the actions of an include file
325
*-----------------------------------------------------------------------
329
for_var_len(const char *var)
331
char ch, var_start, var_end;
337
/* just escape the $ */
340
if (var_start == '(')
342
else if (var_start == '{')
345
/* Single char variable */
349
for (len = 1; (ch = var[len++]) != 0;) {
352
else if (ch == var_end && --depth == 0)
356
/* Variable end not found, escape the $ */
361
for_substitute(Buffer *cmds, strlist_t *items, unsigned int item_no, char ech)
363
const char *item = strlist_str(items, item_no);
367
/* If there were no escapes, or the only escape is the other variable
368
* terminator, then just substitute the full string */
369
if (!(strlist_info(items, item_no) &
370
(ech == ')' ? ~FOR_SUB_ESCAPE_BRACE : ~FOR_SUB_ESCAPE_PAREN))) {
371
Buf_AddBytes(cmds, strlen(item), item);
375
/* Escape ':', '$', '\\' and 'ech' - removed by :U processing */
376
while ((ch = *item++) != 0) {
378
len = for_var_len(item);
380
Buf_AddBytes(cmds, len + 1, item - 1);
384
Buf_AddByte(cmds, '\\');
385
} else if (ch == ':' || ch == '\\' || ch == ech)
386
Buf_AddByte(cmds, '\\');
387
Buf_AddByte(cmds, ch);
392
For_Iterate(void *v_arg, size_t *ret_len)
403
if (arg->sub_next + strlist_num(&arg->vars) > strlist_num(&arg->items)) {
404
/* No more iterations */
409
free(arg->parse_buf);
410
arg->parse_buf = NULL;
413
* Scan the for loop body and replace references to the loop variables
414
* with variable references that expand to the required text.
415
* Using variable expansions ensures that the .for loop can't generate
416
* syntax, and that the later parsing will still see a variable.
417
* We assume that the null variable will never be defined.
419
* The detection of substitions of the loop control variable is naive.
420
* Many of the modifiers use \ to escape $ (not $) so it is possible
421
* to contrive a makefile where an unwanted substitution happens.
424
cmd_cp = Buf_GetAll(&arg->buf, &len);
425
body_end = cmd_cp + len;
426
Buf_Init(&cmds, len + 256);
427
for (cp = cmd_cp; (cp = strchr(cp, '$')) != NULL;) {
430
if ((ch == '(' && (ech = ')')) || (ch == '{' && (ech = '}'))) {
432
/* Check variable name against the .for loop variables */
433
STRLIST_FOREACH(var, &arg->vars, i) {
434
len = strlist_info(&arg->vars, i);
435
if (memcmp(cp, var, len) != 0)
437
if (cp[len] != ':' && cp[len] != ech && cp[len] != '\\')
439
/* Found a variable match. Replace with :U<value> */
440
Buf_AddBytes(&cmds, cp - cmd_cp, cmd_cp);
441
Buf_AddBytes(&cmds, 2, ":U");
444
for_substitute(&cmds, &arg->items, arg->sub_next + i, ech);
451
/* Probably a single character name, ignore $$ and stupid ones. {*/
452
if (!arg->short_var || strchr("}):$", ch) != NULL) {
456
STRLIST_FOREACH(var, &arg->vars, i) {
457
if (var[0] != ch || var[1] != 0)
459
/* Found a variable match. Replace with ${:U<value>} */
460
Buf_AddBytes(&cmds, cp - cmd_cp, cmd_cp);
461
Buf_AddBytes(&cmds, 3, "{:U");
463
for_substitute(&cmds, &arg->items, arg->sub_next + i, /*{*/ '}');
464
Buf_AddBytes(&cmds, 1, "}");
468
Buf_AddBytes(&cmds, body_end - cmd_cp, cmd_cp);
470
cp = Buf_Destroy(&cmds, FALSE);
472
(void)fprintf(debug_file, "For: loop body:\n%s", cp);
474
arg->sub_next += strlist_num(&arg->vars);
477
*ret_len = strlen(cp);
489
if (strlist_num(&arg->items) == 0) {
490
/* Nothing to expand - possibly due to an earlier syntax error. */
495
Parse_SetInput(NULL, lineno, -1, For_Iterate, arg);
added
removed
for.c
