Annotation of src/usr.bin/make/for.c, Revision 1.4
1.3 millert 1: /* $OpenBSD: for.c,v 1.2 1996/06/26 05:36:30 deraadt Exp $ */
2: /* $NetBSD: for.c,v 1.4 1996/11/06 17:59:05 christos Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1992, The Regents of the University of California.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: #if 0
1.3 millert 39: static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93";
1.1 deraadt 40: #else
1.3 millert 41: static char rcsid[] = "$OpenBSD: for.c,v 1.2 1996/06/26 05:36:30 deraadt Exp $";
1.1 deraadt 42: #endif
43: #endif /* not lint */
44:
45: /*-
46: * for.c --
47: * Functions to handle loops in a makefile.
48: *
49: * Interface:
50: * For_Eval Evaluate the loop in the passed line.
51: * For_Run Run accumulated loop
52: *
53: */
54:
55: #include <ctype.h>
56: #include "make.h"
57: #include "hash.h"
58: #include "dir.h"
59: #include "buf.h"
60:
61: /*
62: * For statements are of the form:
63: *
64: * .for <variable> in <varlist>
65: * ...
66: * .endfor
67: *
68: * The trick is to look for the matching end inside for for loop
69: * To do that, we count the current nesting level of the for loops.
70: * and the .endfor statements, accumulating all the statements between
1.3 millert 71: * the initial .for loop and the matching .endfor;
1.1 deraadt 72: * then we evaluate the for loop for each variable in the varlist.
73: */
74:
75: static int forLevel = 0; /* Nesting level */
76: static char *forVar; /* Iteration variable */
77: static Buffer forBuf; /* Commands in loop */
78: static Lst forLst; /* List of items */
79:
80: /*
81: * State of a for loop.
82: */
83: typedef struct _For {
84: Buffer buf; /* Unexpanded buffer */
85: char* var; /* Index name */
86: Lst lst; /* List of variables */
87: } For;
88:
89: static int ForExec __P((ClientData, ClientData));
90:
91:
92:
93:
94: /*-
95: *-----------------------------------------------------------------------
96: * For_Eval --
97: * Evaluate the for loop in the passed line. The line
98: * looks like this:
99: * .for <variable> in <varlist>
100: *
101: * Results:
102: * TRUE: We found a for loop, or we are inside a for loop
103: * FALSE: We did not find a for loop, or we found the end of the for
104: * for loop.
105: *
106: * Side Effects:
107: * None.
108: *
109: *-----------------------------------------------------------------------
110: */
111: int
112: For_Eval (line)
113: char *line; /* Line to parse */
114: {
115: char *ptr = line, *sub, *wrd;
116: int level; /* Level at which to report errors. */
117:
118: level = PARSE_FATAL;
119:
120:
121: if (forLevel == 0) {
122: Buffer buf;
123: int varlen;
124:
125: for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
126: continue;
127: /*
128: * If we are not in a for loop quickly determine if the statement is
129: * a for.
130: */
131: if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
132: !isspace((unsigned char) ptr[3]))
133: return FALSE;
134: ptr += 3;
1.3 millert 135:
1.1 deraadt 136: /*
137: * we found a for loop, and now we are going to parse it.
138: */
139: while (*ptr && isspace((unsigned char) *ptr))
140: ptr++;
1.3 millert 141:
1.1 deraadt 142: /*
143: * Grab the variable
144: */
145: buf = Buf_Init(0);
1.3 millert 146: for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
1.1 deraadt 147: continue;
148: Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd);
149:
150: forVar = (char *) Buf_GetAll(buf, &varlen);
151: if (varlen == 0) {
152: Parse_Error (level, "missing variable in for");
153: return 0;
154: }
155: Buf_Destroy(buf, FALSE);
156:
157: while (*ptr && isspace((unsigned char) *ptr))
158: ptr++;
159:
160: /*
161: * Grab the `in'
162: */
163: if (ptr[0] != 'i' || ptr[1] != 'n' ||
164: !isspace((unsigned char) ptr[2])) {
165: Parse_Error (level, "missing `in' in for");
166: printf("%s\n", ptr);
167: return 0;
168: }
169: ptr += 3;
170:
171: while (*ptr && isspace((unsigned char) *ptr))
172: ptr++;
173:
174: /*
175: * Make a list with the remaining words
176: */
177: forLst = Lst_Init(FALSE);
178: buf = Buf_Init(0);
1.3 millert 179: sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
1.1 deraadt 180:
181: #define ADDWORD() \
182: Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
183: Buf_AddByte(buf, (Byte) '\0'), \
1.3 millert 184: Lst_AtFront(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \
1.1 deraadt 185: Buf_Destroy(buf, FALSE)
186:
187: for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
188: continue;
189:
190: for (wrd = ptr; *ptr; ptr++)
191: if (isspace((unsigned char) *ptr)) {
192: ADDWORD();
193: buf = Buf_Init(0);
194: while (*ptr && isspace((unsigned char) *ptr))
195: ptr++;
196: wrd = ptr--;
197: }
198: if (DEBUG(FOR))
199: (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
1.3 millert 200: if (ptr - wrd > 0)
1.1 deraadt 201: ADDWORD();
202: else
203: Buf_Destroy(buf, TRUE);
204: free((Address) sub);
1.3 millert 205:
1.1 deraadt 206: forBuf = Buf_Init(0);
207: forLevel++;
208: return 1;
209: }
210: else if (*ptr == '.') {
211:
212: for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
213: continue;
214:
215: if (strncmp(ptr, "endfor", 6) == 0 &&
216: (isspace((unsigned char) ptr[6]) || !ptr[6])) {
217: if (DEBUG(FOR))
218: (void) fprintf(stderr, "For: end for %d\n", forLevel);
219: if (--forLevel < 0) {
220: Parse_Error (level, "for-less endfor");
221: return 0;
222: }
223: }
224: else if (strncmp(ptr, "for", 3) == 0 &&
225: isspace((unsigned char) ptr[3])) {
226: forLevel++;
227: if (DEBUG(FOR))
228: (void) fprintf(stderr, "For: new loop %d\n", forLevel);
229: }
230: }
231:
232: if (forLevel != 0) {
233: Buf_AddBytes(forBuf, strlen(line), (Byte *) line);
234: Buf_AddByte(forBuf, (Byte) '\n');
235: return 1;
236: }
237: else {
238: return 0;
239: }
240: }
241:
242: /*-
243: *-----------------------------------------------------------------------
244: * ForExec --
245: * Expand the for loop for this index and push it in the Makefile
246: *
247: * Results:
248: * None.
249: *
250: * Side Effects:
251: * None.
252: *
253: *-----------------------------------------------------------------------
254: */
255: static int
256: ForExec(namep, argp)
257: ClientData namep;
258: ClientData argp;
259: {
260: char *name = (char *) namep;
261: For *arg = (For *) argp;
262: int len;
263: Var_Set(arg->var, name, VAR_GLOBAL);
264: if (DEBUG(FOR))
265: (void) fprintf(stderr, "--- %s = %s\n", arg->var, name);
1.3 millert 266: Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len),
1.1 deraadt 267: VAR_GLOBAL, FALSE));
268: Var_Delete(arg->var, VAR_GLOBAL);
269:
270: return 0;
271: }
272:
273:
274: /*-
275: *-----------------------------------------------------------------------
276: * For_Run --
277: * Run the for loop, immitating the actions of an include file
278: *
279: * Results:
280: * None.
281: *
282: * Side Effects:
283: * None.
284: *
285: *-----------------------------------------------------------------------
286: */
287: void
288: For_Run()
289: {
290: For arg;
291:
292: if (forVar == NULL || forBuf == NULL || forLst == NULL)
293: return;
294: arg.var = forVar;
295: arg.buf = forBuf;
296: arg.lst = forLst;
297: forVar = NULL;
298: forBuf = NULL;
299: forLst = NULL;
300:
301: Lst_ForEach(arg.lst, ForExec, (ClientData) &arg);
302:
303: free((Address)arg.var);
304: Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free);
305: Buf_Destroy(arg.buf, TRUE);
306: }
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