Annotation of src/usr.bin/make/var.c, Revision 1.44
1.44 ! espie 1: /* $OpenBSD: var.c,v 1.43 2000/07/17 23:09:06 espie Exp $ */
1.6 millert 2: /* $NetBSD: var.c,v 1.18 1997/03/18 19:24:46 christos Exp $ */
1.1 deraadt 3:
4: /*
1.17 espie 5: * Copyright (c) 1999 Marc Espie.
6: *
7: * Extensive code modifications for the OpenBSD project.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: *
18: * THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
19: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
22: * PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29: */
30:
31: /*
1.5 millert 32: * Copyright (c) 1988, 1989, 1990, 1993
33: * The Regents of the University of California. All rights reserved.
1.1 deraadt 34: * Copyright (c) 1989 by Berkeley Softworks
35: * All rights reserved.
36: *
37: * This code is derived from software contributed to Berkeley by
38: * Adam de Boor.
39: *
40: * Redistribution and use in source and binary forms, with or without
41: * modification, are permitted provided that the following conditions
42: * are met:
43: * 1. Redistributions of source code must retain the above copyright
44: * notice, this list of conditions and the following disclaimer.
45: * 2. Redistributions in binary form must reproduce the above copyright
46: * notice, this list of conditions and the following disclaimer in the
47: * documentation and/or other materials provided with the distribution.
48: * 3. All advertising materials mentioning features or use of this software
49: * must display the following acknowledgement:
50: * This product includes software developed by the University of
51: * California, Berkeley and its contributors.
52: * 4. Neither the name of the University nor the names of its contributors
53: * may be used to endorse or promote products derived from this software
54: * without specific prior written permission.
55: *
56: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66: * SUCH DAMAGE.
67: */
68:
69: #ifndef lint
70: #if 0
1.5 millert 71: static char sccsid[] = "@(#)var.c 8.3 (Berkeley) 3/19/94";
1.1 deraadt 72: #else
1.44 ! espie 73: static char rcsid[] = "$OpenBSD: var.c,v 1.43 2000/07/17 23:09:06 espie Exp $";
1.1 deraadt 74: #endif
75: #endif /* not lint */
76:
77: /*-
78: * var.c --
79: * Variable-handling functions
80: *
81: * Interface:
82: * Var_Set Set the value of a variable in the given
83: * context. The variable is created if it doesn't
84: * yet exist. The value and variable name need not
85: * be preserved.
86: *
87: * Var_Append Append more characters to an existing variable
88: * in the given context. The variable needn't
89: * exist already -- it will be created if it doesn't.
90: * A space is placed between the old value and the
91: * new one.
92: *
93: * Var_Exists See if a variable exists.
94: *
95: * Var_Value Return the value of a variable in a context or
96: * NULL if the variable is undefined.
97: *
98: * Var_Subst Substitute named variable, or all variables if
99: * NULL in a string using
100: * the given context as the top-most one. If the
101: * third argument is non-zero, Parse_Error is
102: * called if any variables are undefined.
103: *
104: * Var_Parse Parse a variable expansion from a string and
105: * return the result and the number of characters
106: * consumed.
107: *
108: * Var_Delete Delete a variable in a context.
109: *
110: * Var_Init Initialize this module.
111: *
112: * Debugging:
113: * Var_Dump Print out all variables defined in the given
114: * context.
115: *
116: * XXX: There's a lot of duplication in these functions.
117: */
118:
119: #include <ctype.h>
1.6 millert 120: #ifndef MAKE_BOOTSTRAP
1.9 deraadt 121: #include <sys/types.h>
1.6 millert 122: #include <regex.h>
123: #endif
124: #include <stdlib.h>
1.35 espie 125: #include <stddef.h>
1.1 deraadt 126: #include "make.h"
127: #include "buf.h"
1.38 espie 128: #include "ohash.h"
129: #include "hashconsts.h"
1.43 espie 130: #include "varmodifiers.h"
1.34 espie 131:
1.37 espie 132: static SymTable *CTXT_GLOBAL, *CTXT_CMD, *CTXT_ENV;
133:
1.34 espie 134: static char *varnames[] = {
135: TARGET,
136: OODATE,
137: ALLSRC,
138: IMPSRC,
139: PREFIX,
140: ARCHIVE,
141: MEMBER };
142:
1.1 deraadt 143: /*
144: * This is a harmless return value for Var_Parse that can be used by Var_Subst
145: * to determine if there was an error in parsing -- easier than returning
146: * a flag, as things outside this module don't give a hoot.
147: */
148: char var_Error[] = "";
149:
150: /*
151: * Similar to var_Error, but returned when the 'err' flag for Var_Parse is
152: * set false. Why not just use a constant? Well, gcc likes to condense
153: * identical string instances...
154: */
155: static char varNoError[] = "";
156:
157: /*
158: * Internally, variables are contained in four different contexts.
159: * 1) the environment. They may not be changed. If an environment
160: * variable is appended-to, the result is placed in the global
161: * context.
162: * 2) the global context. Variables set in the Makefile are located in
163: * the global context. It is the penultimate context searched when
164: * substituting.
165: * 3) the command-line context. All variables set on the command line
166: * are placed in this context. They are UNALTERABLE once placed here.
167: * 4) the local context. Each target has associated with it a context
168: * list. On this list are located the structures describing such
169: * local variables as $(@) and $(*)
170: * The four contexts are searched in the reverse order from which they are
171: * listed.
172: */
1.37 espie 173: GSymT *VAR_GLOBAL; /* variables from the makefile */
174: GSymT *VAR_CMD; /* variables defined on the command-line */
175: static GSymT *VAR_ENV; /* variables read from env */
1.1 deraadt 176:
1.39 espie 177: #define FIND_MINE 0x1 /* look in CTXT_CMD and CTXT_GLOBAL */
178: #define FIND_ENV 0x2 /* look in the environment */
1.1 deraadt 179:
1.37 espie 180: typedef struct Var_ {
1.23 espie 181: BUFFER val; /* its value */
1.1 deraadt 182: int flags; /* miscellaneous status flags */
183: #define VAR_IN_USE 1 /* Variable's value currently being used.
184: * Used to avoid recursion */
185: #define VAR_JUNK 4 /* Variable is a junk variable that
186: * should be destroyed when done with
187: * it. Used by Var_Parse for undefined,
188: * modified variables */
1.38 espie 189: char name[1]; /* the variable's name */
1.1 deraadt 190: } Var;
191:
1.38 espie 192: static struct hash_info var_info = {
193: offsetof(Var, name),
194: NULL, hash_alloc, hash_free, element_alloc };
195: static int quick_lookup __P((const char *, const char **, u_int32_t *));
1.23 espie 196: #define VarValue(v) Buf_Retrieve(&((v)->val))
1.39 espie 197: static Var *varfind __P((const char *, const char *, SymTable *, int, int, u_int32_t));
198: static Var *VarFind_interval __P((const char *, const char *, SymTable *, int));
199: #define VarFind(n, ctxt, flags) VarFind_interval(n, NULL, ctxt, flags)
200: static Var *VarAdd __P((const char *, const char *, GSymT *));
1.32 espie 201: static void VarDelete __P((void *));
202: static void VarPrintVar __P((void *));
1.38 espie 203: static const char *context_name __P((GSymT *));
1.39 espie 204: static Var *new_var __P((const char *, const char *));
205: static Var *getvar __P((GSymT *, const char *, const char *, u_int32_t));
1.37 espie 206:
207: void
208: SymTable_Init(ctxt)
209: SymTable *ctxt;
210: {
211: static SymTable sym_template;
212: memcpy(ctxt, &sym_template, sizeof(*ctxt));
213: }
214:
215: void
216: SymTable_Destroy(ctxt)
217: SymTable *ctxt;
218: {
219: int i;
220:
221: for (i = 0; i < LOCAL_SIZE; i++)
222: if (ctxt->locals[i] != NULL)
223: VarDelete(ctxt->locals[i]);
224: }
225:
1.38 espie 226: static int
227: quick_lookup(name, end, pk)
228: const char *name;
229: const char **end;
230: u_int32_t *pk;
231: {
232: size_t len;
233:
234: *pk = hash_interval(name, end);
235: len = *end - name;
236: /* substitute short version for long local name */
237: switch (*pk % MAGICSLOTS) { /* MAGICSLOTS should be the */
238: case K_LONGALLSRC % MAGICSLOTS: /* smallest constant yielding */
239: /* distinct case values */
240: if (*pk == K_LONGALLSRC && strncmp(name, LONGALLSRC, len) == 0 &&
241: len == strlen(LONGALLSRC))
242: return ALLSRC_INDEX;
243: break;
244: case K_LONGARCHIVE % MAGICSLOTS:
245: if (*pk == K_LONGARCHIVE && strncmp(name, LONGARCHIVE, len) == 0 &&
246: len == strlen(LONGARCHIVE))
247: return ARCHIVE_INDEX;
248: break;
249: case K_LONGIMPSRC % MAGICSLOTS:
250: if (*pk == K_LONGIMPSRC && strncmp(name, LONGIMPSRC, len) == 0 &&
251: len == strlen(LONGIMPSRC))
252: return IMPSRC_INDEX;
253: break;
254: case K_LONGMEMBER % MAGICSLOTS:
255: if (*pk == K_LONGMEMBER && strncmp(name, LONGMEMBER, len) == 0 &&
256: len == strlen(LONGMEMBER))
257: return MEMBER_INDEX;
258: break;
259: case K_LONGOODATE % MAGICSLOTS:
260: if (*pk == K_LONGOODATE && strncmp(name, LONGOODATE, len) == 0 &&
261: len == strlen(LONGOODATE))
262: return OODATE_INDEX;
263: break;
264: case K_LONGPREFIX % MAGICSLOTS:
265: if (*pk == K_LONGPREFIX && strncmp(name, LONGPREFIX, len) == 0 &&
266: len == strlen(LONGPREFIX))
267: return PREFIX_INDEX;
268: break;
269: case K_LONGTARGET % MAGICSLOTS:
270: if (*pk == K_LONGTARGET && strncmp(name, LONGTARGET, len) == 0 &&
271: len == strlen(LONGTARGET))
272: return TARGET_INDEX;
273: break;
274: case K_TARGET % MAGICSLOTS:
275: if (name[0] == TARGET[0] && len == 1)
276: return TARGET_INDEX;
277: break;
278: case K_OODATE % MAGICSLOTS:
279: if (name[0] == OODATE[0] && len == 1)
280: return OODATE_INDEX;
281: break;
282: case K_ALLSRC % MAGICSLOTS:
283: if (name[0] == ALLSRC[0] && len == 1)
284: return ALLSRC_INDEX;
285: break;
286: case K_IMPSRC % MAGICSLOTS:
287: if (name[0] == IMPSRC[0] && len == 1)
288: return IMPSRC_INDEX;
289: break;
290: case K_PREFIX % MAGICSLOTS:
291: if (name[0] == PREFIX[0] && len == 1)
292: return PREFIX_INDEX;
293: break;
294: case K_ARCHIVE % MAGICSLOTS:
295: if (name[0] == ARCHIVE[0] && len == 1)
296: return ARCHIVE_INDEX;
297: break;
298: case K_MEMBER % MAGICSLOTS:
299: if (name[0] == MEMBER[0] && len == 1)
300: return MEMBER_INDEX;
301: break;
302: default:
303: break;
304: }
305: return -1;
306: }
1.37 espie 307:
308: void
309: Varq_Set(idx, val, gn)
310: int idx;
311: char *val;
312: GNode *gn;
313: {
1.38 espie 314: /* We only look for a variable in the given context since anything set
315: * here will override anything in a lower context, so there's not much
316: * point in searching them all just to save a bit of memory... */
1.37 espie 317: Var *v = gn->context.locals[idx];
318:
319: if (v == NULL) {
320: v = new_var(varnames[idx], val);
321: v->flags = 0;
322: gn->context.locals[idx] = v;
323: } else {
324: Buf_Reset(&(v->val));
325: Buf_AddString(&(v->val), val);
326:
327: }
328: if (DEBUG(VAR))
329: printf("%s:%s = %s\n", gn->name, varnames[idx], val);
330: }
331:
332: void
333: Varq_Append(idx, val, gn)
334: int idx;
335: char *val;
336: GNode *gn;
337: {
338: Var *v = gn->context.locals[idx];
339:
340: if (v == NULL) {
341: v = new_var(varnames[idx], val);
342: v->flags = 0;
343: gn->context.locals[idx] = v;
344: } else {
345: Buf_AddSpace(&(v->val));
346: Buf_AddString(&(v->val), val);
347: }
348: if (DEBUG(VAR))
349: printf("%s:%s = %s\n", gn->name, varnames[idx], VarValue(v));
350: }
351:
352: char *
353: Varq_Value(idx, gn)
354: int idx;
355: GNode *gn;
356: {
357: Var *v = gn->context.locals[idx];
358:
359: if (v != NULL)
360: return VarValue(v);
361: else
362: return NULL;
363: }
364:
365: Boolean
366: Varq_Exists(idx, gn)
367: int idx;
368: GNode *gn;
369: {
370: return gn->context.locals[idx] != NULL;
371: }
1.1 deraadt 372:
1.35 espie 373:
1.38 espie 374: static const char *
1.35 espie 375: context_name(ctxt)
1.37 espie 376: GSymT *ctxt;
1.35 espie 377: {
378: if (ctxt == VAR_GLOBAL)
379: return "Global";
1.37 espie 380: else if (ctxt == VAR_CMD)
1.35 espie 381: return "Command";
1.37 espie 382: else
1.35 espie 383: return "Environment";
384: }
385:
1.37 espie 386: /* Create a variable, to pass to VarAdd. */
387: static Var *
388: new_var(name, val)
1.39 espie 389: const char *name;
390: const char *val;
1.37 espie 391: {
392: Var *v;
1.38 espie 393: const char *end = NULL;
1.37 espie 394:
1.38 espie 395: v = hash_create_entry(&var_info, name, &end);
1.37 espie 396:
397: if (val != NULL) {
398: size_t len = strlen(val);
399: Buf_Init(&(v->val), len+1);
400: Buf_AddChars(&(v->val), len, val);
401: } else
402: Buf_Init(&(v->val), 1);
403:
404: return v;
405: }
406:
1.38 espie 407: static Var *
408: getvar(ctxt, name, end, k)
409: GSymT *ctxt;
1.39 espie 410: const char *name;
1.38 espie 411: const char *end;
412: u_int32_t k;
1.1 deraadt 413: {
1.38 espie 414: return hash_find(ctxt, hash_lookup_interval(ctxt, name, end, k));
1.37 espie 415: }
416:
1.1 deraadt 417: /*-
418: *-----------------------------------------------------------------------
1.39 espie 419: * VarFind_interval --
1.1 deraadt 420: * Find the given variable in the given context and any other contexts
1.39 espie 421: * indicated. if end is NULL, name is a string, otherwise, only
422: * the interval name - end is concerned.
1.1 deraadt 423: *
424: * Results:
425: * A pointer to the structure describing the desired variable or
1.26 espie 426: * NULL if the variable does not exist.
1.1 deraadt 427: *
428: * Side Effects:
1.17 espie 429: * Caches env variables in the VAR_ENV context.
1.1 deraadt 430: *-----------------------------------------------------------------------
431: */
432: static Var *
1.39 espie 433: VarFind_interval(name, end, ctxt, flags)
434: const char *name; /* name to find */
435: const char *end; /* end of name */
1.35 espie 436: SymTable *ctxt; /* context in which to find it */
1.39 espie 437: int flags; /* FIND_MINE set means to look in the
438: * CTXT_GLOBAL and CTXT_CMD contexts also.
1.1 deraadt 439: * FIND_ENV set means to look in the
1.39 espie 440: * environment */
1.1 deraadt 441: {
1.38 espie 442: int idx;
443: u_int32_t k;
444:
445: idx = quick_lookup(name, &end, &k);
1.39 espie 446: return varfind(name, end, ctxt, flags, idx, k);
447: }
448:
449: static Var *
450: varfind(name, end, ctxt, flags, idx, k)
451: const char *name;
452: const char *end;
453: SymTable *ctxt;
454: int flags;
455: int idx;
456: u_int32_t k;
457: {
458: Var *v;
1.1 deraadt 459:
460: /*
461: * First look for the variable in the given context. If it's not there,
462: * look for it in VAR_CMD, VAR_GLOBAL and the environment, in that order,
463: * depending on the FIND_* flags in 'flags'
464: */
1.37 espie 465: if (ctxt == NULL)
466: v = NULL;
467: else if (ctxt == CTXT_GLOBAL || ctxt == CTXT_CMD || ctxt == CTXT_ENV)
1.38 espie 468: v = getvar((GSymT *)ctxt, name, end, k);
1.37 espie 469: else {
1.38 espie 470: if (idx == -1)
471: v = NULL;
472: else
473: v = ctxt->locals[idx];
1.37 espie 474: }
475: if (v != NULL)
476: return v;
477:
1.39 espie 478: if ((flags & FIND_MINE) && ctxt != CTXT_CMD)
1.38 espie 479: v = getvar(VAR_CMD, name, end, k);
1.37 espie 480: if (v != NULL)
481: return v;
482:
1.39 espie 483: if (!checkEnvFirst && (flags & FIND_MINE) && ctxt != CTXT_GLOBAL)
1.38 espie 484: v = getvar(VAR_GLOBAL, name, end, k);
1.37 espie 485: if (v != NULL)
486: return v;
487:
488: if ((flags & FIND_ENV)) {
489: char *env;
1.42 espie 490: char *n;
1.37 espie 491:
1.38 espie 492: v = getvar(VAR_ENV, name, end, k);
1.37 espie 493: if (v != NULL)
494: return v;
1.1 deraadt 495:
1.42 espie 496: /* getenv requires a null-terminated name */
497: n = interval_dup(name, end);
498: env = getenv(n);
499: free(n);
500: if (env != NULL)
1.37 espie 501: return VarAdd(name, env, VAR_ENV);
502: }
1.17 espie 503:
1.39 espie 504: if (checkEnvFirst && (flags & FIND_MINE) && ctxt != CTXT_GLOBAL)
1.38 espie 505: v = getvar(VAR_GLOBAL, name, end, k);
1.37 espie 506: return v;
1.1 deraadt 507: }
508:
509: /*-
510: *-----------------------------------------------------------------------
511: * VarAdd --
512: * Add a new variable of name name and value val to the given context
513: *
514: * Results:
1.17 espie 515: * The added variable
1.1 deraadt 516: *
517: * Side Effects:
518: * The new variable is placed at the front of the given context
519: * The name and val arguments are duplicated so they may
520: * safely be freed.
521: *-----------------------------------------------------------------------
522: */
1.17 espie 523: static Var *
524: VarAdd(name, val, ctxt)
1.39 espie 525: const char *name; /* name of variable to add */
526: const char *val; /* value to set it to */
1.37 espie 527: GSymT *ctxt; /* context in which to set it */
1.1 deraadt 528: {
1.38 espie 529: Var *v;
530: const char *end = NULL;
531: int idx;
532: u_int32_t k;
1.1 deraadt 533:
1.37 espie 534: v = new_var(name, val);
1.1 deraadt 535:
536: v->flags = 0;
537:
1.38 espie 538: idx = quick_lookup(name, &end, &k);
539:
540: if (idx != -1) {
541: Parse_Error(PARSE_FATAL, "Trying to set dynamic variable %s",
542: v->name);
543: } else
544: hash_insert(ctxt, hash_lookup_interval(ctxt, name, end, k), v);
1.17 espie 545: return v;
1.1 deraadt 546: }
547:
548:
549: /*-
550: *-----------------------------------------------------------------------
551: * VarDelete --
552: * Delete a variable and all the space associated with it.
553: *
554: * Results:
555: * None
556: *
557: * Side Effects:
558: * None
559: *-----------------------------------------------------------------------
560: */
561: static void
562: VarDelete(vp)
1.32 espie 563: void *vp;
1.1 deraadt 564: {
565: Var *v = (Var *) vp;
1.23 espie 566: Buf_Destroy(&(v->val));
567: free(v);
1.1 deraadt 568: }
569:
570:
571:
572: /*-
573: *-----------------------------------------------------------------------
574: * Var_Delete --
575: * Remove a variable from a context.
576: *
577: * Results:
578: * None.
579: *
580: * Side Effects:
581: * The Var structure is removed and freed.
582: *
583: *-----------------------------------------------------------------------
584: */
585: void
586: Var_Delete(name, ctxt)
587: char *name;
1.37 espie 588: GSymT *ctxt;
1.1 deraadt 589: {
1.38 espie 590: Var *v;
591: u_int32_t k;
592: const char *end = NULL;
1.1 deraadt 593:
1.37 espie 594: if (DEBUG(VAR))
1.35 espie 595: printf("%s:delete %s\n", context_name(ctxt), name);
1.38 espie 596: (void)quick_lookup(name, &end, &k);
597: v = hash_remove(ctxt, hash_lookup_interval(ctxt, name, end, k));
1.37 espie 598:
1.38 espie 599: if (v != NULL)
1.30 espie 600: VarDelete(v);
1.1 deraadt 601: }
602:
603: /*-
604: *-----------------------------------------------------------------------
605: * Var_Set --
606: * Set the variable name to the value val in the given context.
607: *
608: * Results:
609: * None.
610: *
611: * Side Effects:
612: * If the variable doesn't yet exist, a new record is created for it.
613: * Else the old value is freed and the new one stuck in its place
614: *
615: * Notes:
616: * The variable is searched for only in its context before being
617: * created in that context. I.e. if the context is VAR_GLOBAL,
618: * only VAR_GLOBAL->context is searched. Likewise if it is VAR_CMD, only
619: * VAR_CMD->context is searched. This is done to avoid the literally
620: * thousands of unnecessary strcmp's that used to be done to
621: * set, say, $(@) or $(<).
622: *-----------------------------------------------------------------------
623: */
624: void
1.35 espie 625: Var_Set(name, val, ctxt)
1.37 espie 626: char *name; /* name of variable to set */
627: char *val; /* value to give to the variable */
628: GSymT *ctxt; /* context in which to set it */
1.1 deraadt 629: {
630: register Var *v;
631:
632: /*
633: * We only look for a variable in the given context since anything set
634: * here will override anything in a lower context, so there's not much
635: * point in searching them all just to save a bit of memory...
636: */
1.37 espie 637: v = VarFind(name, (SymTable *)ctxt, 0);
1.38 espie 638: if (v == NULL)
1.17 espie 639: (void)VarAdd(name, val, ctxt);
1.38 espie 640: else {
1.23 espie 641: Buf_Reset(&(v->val));
642: Buf_AddString(&(v->val), val);
1.1 deraadt 643:
644: }
1.37 espie 645: if (DEBUG(VAR))
646: printf("%s:%s = %s\n", context_name(ctxt), name, val);
1.1 deraadt 647: /*
648: * Any variables given on the command line are automatically exported
1.17 espie 649: * to the environment (as per POSIX standard).
650: * We put them into the env cache directly.
651: * (Note that additions to VAR_CMD occur very early, so VAR_ENV is
652: * actually empty at this point).
1.1 deraadt 653: */
654: if (ctxt == VAR_CMD) {
655: setenv(name, val, 1);
1.17 espie 656: (void)VarAdd(name, val, VAR_ENV);
1.1 deraadt 657: }
658: }
659:
660: /*-
661: *-----------------------------------------------------------------------
662: * Var_Append --
663: * The variable of the given name has the given value appended to it in
664: * the given context.
665: *
666: * Results:
667: * None
668: *
669: * Side Effects:
670: * If the variable doesn't exist, it is created. Else the strings
671: * are concatenated (with a space in between).
672: *
673: * Notes:
674: * Only if the variable is being sought in the global context is the
675: * environment searched.
676: * XXX: Knows its calling circumstances in that if called with ctxt
677: * an actual target, it will only search that context since only
678: * a local variable could be being appended to. This is actually
679: * a big win and must be tolerated.
680: *-----------------------------------------------------------------------
681: */
682: void
1.35 espie 683: Var_Append(name, val, ctxt)
1.37 espie 684: char *name; /* Name of variable to modify */
685: char *val; /* String to append to it */
686: GSymT *ctxt; /* Context in which this should occur */
1.1 deraadt 687: {
688: register Var *v;
689:
1.37 espie 690: v = VarFind(name, (SymTable *)ctxt, (ctxt == VAR_GLOBAL) ? FIND_ENV : 0);
1.1 deraadt 691:
1.26 espie 692: if (v == NULL) {
1.17 espie 693: (void)VarAdd(name, val, ctxt);
1.1 deraadt 694: } else {
1.23 espie 695: Buf_AddSpace(&(v->val));
696: Buf_AddString(&(v->val), val);
1.1 deraadt 697:
698:
699: }
1.37 espie 700: if (DEBUG(VAR))
701: printf("%s:%s = %s\n", context_name(ctxt), name, VarValue(v));
1.1 deraadt 702: }
703:
704: /*-
705: *-----------------------------------------------------------------------
706: * Var_Exists --
707: * See if the given variable exists.
708: *
709: * Results:
710: * TRUE if it does, FALSE if it doesn't
711: *
712: * Side Effects:
713: * None.
714: *
715: *-----------------------------------------------------------------------
716: */
717: Boolean
718: Var_Exists(name, ctxt)
1.37 espie 719: char *name; /* Variable to find */
720: GSymT *ctxt; /* Context in which to start search */
1.1 deraadt 721: {
722: Var *v;
723:
1.39 espie 724: v = VarFind(name, (SymTable *)ctxt, FIND_MINE|FIND_ENV);
1.1 deraadt 725:
1.26 espie 726: if (v == NULL)
1.17 espie 727: return FALSE;
728: else
729: return TRUE;
1.1 deraadt 730: }
731:
732: /*-
733: *-----------------------------------------------------------------------
734: * Var_Value --
735: * Return the value of the named variable in the given context
736: *
737: * Results:
738: * The value if the variable exists, NULL if it doesn't
739: *
740: * Side Effects:
741: * None
742: *-----------------------------------------------------------------------
743: */
744: char *
1.18 espie 745: Var_Value(name, ctxt)
1.37 espie 746: char *name; /* name to find */
747: GSymT *ctxt; /* context in which to search for it */
1.1 deraadt 748: {
749: Var *v;
750:
1.39 espie 751: v = VarFind(name, (SymTable *)ctxt, FIND_ENV | FIND_MINE);
1.26 espie 752: if (v != NULL)
1.23 espie 753: return VarValue(v);
1.21 espie 754: else
1.17 espie 755: return NULL;
1.1 deraadt 756: }
757:
758: /*-
759: *-----------------------------------------------------------------------
760: * Var_Parse --
761: * Given the start of a variable invocation, extract the variable
762: * name and find its value, then modify it according to the
763: * specification.
764: *
765: * Results:
766: * The (possibly-modified) value of the variable or var_Error if the
767: * specification is invalid. The length of the specification is
768: * placed in *lengthPtr (for invalid specifications, this is just
769: * 2...?).
770: * A Boolean in *freePtr telling whether the returned string should
771: * be freed by the caller.
772: *-----------------------------------------------------------------------
773: */
774: char *
1.35 espie 775: Var_Parse(str, ctxt, err, lengthPtr, freePtr)
1.44 ! espie 776: char *str; /* The string to parse */
! 777: SymTable *ctxt; /* The context for the variable */
! 778: Boolean err; /* TRUE if undefined variables are an error */
! 779: size_t *lengthPtr; /* OUT: The length of the specification */
! 780: Boolean *freePtr; /* OUT: TRUE if caller should free result */
! 781: {
! 782: char *tstr; /* Pointer into str */
! 783: Var *v; /* Variable in invocation */
! 784: char endc; /* Ending character when variable in parens
1.1 deraadt 785: * or braces */
1.44 ! espie 786: char *start;
! 787: char *val; /* Variable value */
! 788: u_int32_t k;
! 789: int idx;
1.5 millert 790:
1.1 deraadt 791: *freePtr = FALSE;
1.44 ! espie 792: start = str++;
1.5 millert 793:
1.44 ! espie 794: val = NULL;
! 795:
! 796: if (*str != '(' && *str != '{') {
! 797: tstr = str + 1;
! 798: *lengthPtr = 2;
! 799: endc = '\0';
1.1 deraadt 800: } else {
1.44 ! espie 801: endc = *str == '(' ? ')' : '}';
! 802: str++;
1.5 millert 803:
1.44 ! espie 804: /* Find eventual modifiers in the variable */
! 805: for (tstr = str; *tstr != ':'; tstr++)
! 806: if (*tstr == '\0' || *tstr == endc) {
! 807: endc = '\0';
! 808: break;
1.1 deraadt 809: }
1.44 ! espie 810: *lengthPtr = tstr+1 - start;
! 811: }
1.5 millert 812:
1.44 ! espie 813: idx = quick_lookup(str, &tstr, &k);
! 814: v = varfind(str, tstr, ctxt, FIND_ENV | FIND_MINE, idx, k);
! 815: if (v == NULL) {
! 816: /* Find out about D and F forms of local variables. */
! 817: if (idx == -1 && tstr == str+2 && (str[1] == 'D' || str[1] == 'F')) {
! 818: switch (*str) {
! 819: case '@':
! 820: idx = TARGET_INDEX;
! 821: break;
! 822: case '!':
! 823: idx = ARCHIVE_INDEX;
! 824: break;
! 825: case '*':
! 826: idx = PREFIX_INDEX;
! 827: break;
! 828: case '%':
! 829: idx = MEMBER_INDEX;
! 830: break;
! 831: default:
! 832: break;
1.1 deraadt 833: }
1.44 ! espie 834: /* This is a DF form, check if we can expand it now. */
! 835: if (idx != -1 && ctxt != NULL && ctxt != CTXT_GLOBAL) {
! 836: v = varfind(str, str+1, ctxt, 0, idx, 0);
! 837: /* No need for nested expansion or anything, as we're
! 838: * the only one who sets these things and we sure don't
! 839: * do nested invocations in them... */
! 840: if (v != NULL) {
! 841: val = VarValue(v);
! 842: if (str[1] == 'D')
! 843: val = Var_GetHead(val);
! 844: else
! 845: val = Var_GetTail(val);
1.1 deraadt 846: *freePtr = TRUE;
1.44 ! espie 847: }
1.1 deraadt 848: }
849: }
1.44 ! espie 850: } else {
! 851: if (v->flags & VAR_IN_USE)
! 852: Fatal("Variable %s is recursive.", v->name);
! 853: /*NOTREACHED*/
! 854: else
! 855: v->flags |= VAR_IN_USE;
! 856: /* Before doing any modification, we have to make sure the value
! 857: * has been fully expanded. If it looks like recursion might be
! 858: * necessary (there's a dollar sign somewhere in the variable's value)
! 859: * we just call Var_Subst to do any other substitutions that are
! 860: * necessary. Note that the value returned by Var_Subst will have
! 861: * been dynamically-allocated, so it will need freeing when we
! 862: * return. */
! 863: val = VarValue(v);
! 864: if (strchr(val, '$') != NULL) {
! 865: val = Var_Subst(val, ctxt, err);
! 866: *freePtr = TRUE;
! 867: }
! 868:
! 869: v->flags &= ~VAR_IN_USE;
1.1 deraadt 870: }
1.44 ! espie 871: if (endc != '\0')
! 872: val = VarModifiers_Apply(val, ctxt, err, freePtr, tstr+1, endc,
1.42 espie 873: lengthPtr);
1.44 ! espie 874: if (val == NULL) {
! 875: /* Dynamic source that can't be expanded for now: copy the var
! 876: * specification instead. */
! 877: if (idx != -1 && (ctxt == NULL || ctxt == CTXT_GLOBAL)) {
1.42 espie 878: *freePtr = TRUE;
1.44 ! espie 879: val = interval_dup(start, start+ *lengthPtr);
! 880: } else
! 881: val = err ? var_Error : varNoError;
1.42 espie 882: }
1.44 ! espie 883:
! 884: return val;
1.42 espie 885: }
886:
1.1 deraadt 887: /*-
888: *-----------------------------------------------------------------------
889: * Var_Subst --
1.24 espie 890: * Substitute for all variables in a string in a context
1.1 deraadt 891: * If undefErr is TRUE, Parse_Error will be called when an undefined
892: * variable is encountered.
893: *
894: * Results:
895: * The resulting string.
896: *
897: * Side Effects:
898: * None. The old string must be freed by the caller
899: *-----------------------------------------------------------------------
900: */
901: char *
1.24 espie 902: Var_Subst(str, ctxt, undefErr)
1.1 deraadt 903: char *str; /* the string in which to substitute */
1.35 espie 904: SymTable *ctxt; /* the context wherein to find variables */
1.1 deraadt 905: Boolean undefErr; /* TRUE if undefineds are an error */
906: {
1.24 espie 907: BUFFER buf; /* Buffer for forming things */
1.1 deraadt 908: static Boolean errorReported; /* Set true if an error has already
909: * been reported to prevent a plethora
910: * of messages when recursing */
911:
1.23 espie 912: Buf_Init(&buf, MAKE_BSIZE);
1.1 deraadt 913: errorReported = FALSE;
914:
1.24 espie 915: for (;;) {
916: char *val; /* Value to substitute for a variable */
917: size_t length; /* Length of the variable invocation */
918: Boolean doFree; /* Set true if val should be freed */
919: const char *cp;
920:
921: /* copy uninteresting stuff */
922: for (cp = str; *str != '\0' && *str != '$'; str++)
923: ;
924: Buf_AddInterval(&buf, cp, str);
925: if (*str == '\0')
926: break;
927: if (str[1] == '$') {
928: /* A dollar sign may be escaped with another dollar sign. */
929: Buf_AddChar(&buf, '$');
930: str += 2;
931: continue;
932: }
933: val = Var_Parse(str, ctxt, undefErr, &length, &doFree);
934: /* When we come down here, val should either point to the
935: * value of this variable, suitably modified, or be NULL.
936: * Length should be the total length of the potential
937: * variable invocation (from $ to end character...) */
938: if (val == var_Error || val == varNoError) {
939: /* If performing old-time variable substitution, skip over
940: * the variable and continue with the substitution. Otherwise,
941: * store the dollar sign and advance str so we continue with
942: * the string... */
943: if (oldVars) {
944: str += length;
945: } else if (undefErr) {
946: /* If variable is undefined, complain and skip the
947: * variable. The complaint will stop us from doing anything
948: * when the file is parsed. */
949: if (!errorReported) {
950: Parse_Error(PARSE_FATAL,
951: "Undefined variable \"%.*s\"",length,str);
952: }
953: str += length;
954: errorReported = TRUE;
955: } else {
956: Buf_AddChar(&buf, *str);
957: str += 1;
958: }
959: } else {
960: /* We've now got a variable structure to store in. But first,
961: * advance the string pointer. */
962: str += length;
963:
964: /* Copy all the characters from the variable value straight
965: * into the new string. */
966: Buf_AddString(&buf, val);
967: if (doFree)
968: free(val);
969: }
970: }
971: return Buf_Retrieve(&buf);
972: }
1.1 deraadt 973:
1.24 espie 974: /*-
975: *-----------------------------------------------------------------------
976: * Var_SubstVar --
977: * Substitute for one variable in the given string in the given context
978: * If undefErr is TRUE, Parse_Error will be called when an undefined
979: * variable is encountered.
980: *
981: * Side Effects:
982: * Append the result to the buffer
983: *-----------------------------------------------------------------------
984: */
985: void
986: Var_SubstVar(buf, str, var, ctxt)
987: Buffer buf; /* Where to store the result */
988: char *str; /* The string in which to substitute */
989: const char *var; /* Named variable */
1.37 espie 990: GSymT *ctxt; /* The context wherein to find variables */
1.24 espie 991: {
992: char *val; /* Value substituted for a variable */
993: size_t length; /* Length of the variable invocation */
994: Boolean doFree; /* Set true if val should be freed */
995:
996: for (;;) {
997: const char *cp;
998: /* copy uninteresting stuff */
999: for (cp = str; *str != '\0' && *str != '$'; str++)
1000: ;
1001: Buf_AddInterval(buf, cp, str);
1002: if (*str == '\0')
1003: break;
1004: if (str[1] == '$') {
1005: Buf_AddString(buf, "$$");
1006: str += 2;
1007: continue;
1008: }
1009: if (str[1] != '(' && str[1] != '{') {
1010: if (str[1] != *var || var[1] != '\0') {
1011: Buf_AddChars(buf, 2, str);
1012: str += 2;
1.1 deraadt 1013: continue;
1.24 espie 1014: }
1.1 deraadt 1015: } else {
1.24 espie 1016: char *p;
1017: char endc;
1.1 deraadt 1018:
1.24 espie 1019: if (str[1] == '(')
1020: endc = ')';
1021: else if (str[1] == '{')
1022: endc = '}';
1023:
1024: /* Find the end of the variable specification. */
1025: p = str+2;
1026: while (*p != '\0' && *p != ':' && *p != endc && *p != '$')
1027: p++;
1028: /* A variable inside the variable. We don't know how to
1029: * expand the external variable at this point, so we try
1030: * again with the nested variable. */
1031: if (*p == '$') {
1032: Buf_AddInterval(buf, str, p);
1033: str = p;
1034: continue;
1.1 deraadt 1035: }
1.5 millert 1036:
1.24 espie 1037: if (strncmp(var, str + 2, p - str - 2) != 0 ||
1038: var[p - str - 2] != '\0') {
1039: /* Not the variable we want to expand. */
1040: Buf_AddInterval(buf, str, p);
1041: str = p;
1042: continue;
1043: }
1.1 deraadt 1044: }
1.24 espie 1045: /* okay, so we've found the variable we want to expand. */
1.37 espie 1046: val = Var_Parse(str, (SymTable *)ctxt, FALSE, &length, &doFree);
1.24 espie 1047: /* We've now got a variable structure to store in. But first,
1048: * advance the string pointer. */
1049: str += length;
1050:
1051: /* Copy all the characters from the variable value straight
1052: * into the new string. */
1053: Buf_AddString(buf, val);
1054: if (doFree)
1055: free(val);
1.1 deraadt 1056: }
1057: }
1058:
1059: /*-
1060: *-----------------------------------------------------------------------
1061: * Var_Init --
1062: * Initialize the module
1063: *
1064: * Side Effects:
1.5 millert 1065: * The VAR_CMD and VAR_GLOBAL contexts are created
1.1 deraadt 1066: *-----------------------------------------------------------------------
1067: */
1068: void
1.33 espie 1069: Var_Init()
1.1 deraadt 1070: {
1.37 espie 1071: static GSymT global_vars, cmd_vars, env_vars;
1.35 espie 1072:
1073: VAR_GLOBAL = &global_vars;
1074: VAR_CMD = &cmd_vars;
1075: VAR_ENV = &env_vars;
1.38 espie 1076: hash_init(VAR_GLOBAL, 10, &var_info);
1077: hash_init(VAR_CMD, 5, &var_info);
1078: hash_init(VAR_ENV, 5, &var_info);
1.37 espie 1079: CTXT_GLOBAL = (SymTable *)VAR_GLOBAL;
1080: CTXT_CMD = (SymTable *)VAR_CMD;
1081: CTXT_ENV = (SymTable *)VAR_ENV;
1.1 deraadt 1082: }
1083:
1084:
1085: void
1.33 espie 1086: Var_End()
1.1 deraadt 1087: {
1.37 espie 1088: #ifdef CLEANUP
1.38 espie 1089: Var *v;
1090: unsigned int i;
1091:
1092: for (v = hash_first(VAR_GLOBAL, &i); v != NULL;
1093: v = hash_next(VAR_GLOBAL, &i))
1094: VarDelete(v);
1095: for (v = hash_first(VAR_CMD, &i); v != NULL;
1096: v = hash_next(VAR_CMD, &i))
1097: VarDelete(v);
1098: for (v = hash_first(VAR_ENV, &i); v != NULL;
1099: v = hash_next(VAR_ENV, &i))
1100: VarDelete(v);
1.37 espie 1101: #endif
1.1 deraadt 1102: }
1.5 millert 1103:
1.1 deraadt 1104:
1105: /****************** PRINT DEBUGGING INFO *****************/
1.31 espie 1106: static void
1107: VarPrintVar(vp)
1.32 espie 1108: void *vp;
1.1 deraadt 1109: {
1.31 espie 1110: Var *v = (Var *)vp;
1111:
1.23 espie 1112: printf("%-16s = %s\n", v->name, VarValue(v));
1.1 deraadt 1113: }
1114:
1115: /*-
1116: *-----------------------------------------------------------------------
1117: * Var_Dump --
1118: * print all variables in a context
1119: *-----------------------------------------------------------------------
1120: */
1121: void
1.35 espie 1122: Var_Dump(ctxt)
1.37 espie 1123: GSymT *ctxt;
1.1 deraadt 1124: {
1.38 espie 1125: Var *v;
1126: unsigned int i;
1127:
1128: for (v = hash_first(ctxt, &i); v != NULL;
1129: v = hash_next(ctxt, &i))
1130: VarPrintVar(v);
1.1 deraadt 1131: }
1.37 espie 1132:
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