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32 * @(#)for.c 8.1 (Berkeley) 6/6/93
33 * $FreeBSD: src/usr.bin/make/for.c,v 1.35 2005/02/10 14:39:05 harti Exp $
34 * $DragonFly: src/usr.bin/make/for.c,v 1.30 2005/02/15 01:01:18 okumoto Exp $
39 * Functions to handle loops in a makefile.
42 * For_Eval Evaluate the loop in the passed line.
43 * For_Run Run accumulated loop
62 * For statements are of the form:
64 * .for <variable> in <varlist>
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
71 * the initial .for loop and the matching .endfor;
72 * then we evaluate the for loop for each variable in the varlist.
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 */
81 * State of a for loop.
84 Buffer *buf; /* Unexpanded buffer */
85 char* var; /* Index name */
86 Lst lst; /* List of variables */
87 int lineno; /* Line # */
90 static int ForExec(void *, void *);
93 *-----------------------------------------------------------------------
95 * Evaluate the for loop in the passed line. The line
97 * .for <variable> in <varlist>
100 * TRUE: We found a for loop, or we are inside a for loop
101 * FALSE: We did not find a for loop, or we found the end of the for
107 *-----------------------------------------------------------------------
112 char *ptr = line, *sub, *wrd;
113 int level; /* Level at which to report errors. */
122 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
125 * If we are not in a for loop quickly determine if the statement is
128 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
129 !isspace((unsigned char)ptr[3]))
134 * we found a for loop, and now we are going to parse it.
136 while (*ptr && isspace((unsigned char)*ptr))
143 for (wrd = ptr; *ptr && !isspace((unsigned char)*ptr); ptr++)
145 Buf_AppendRange(buf, wrd, ptr);
147 forVar = (char *)Buf_GetAll(buf, &varlen);
149 Parse_Error(level, "missing variable in for");
152 Buf_Destroy(buf, FALSE);
154 while (*ptr && isspace((unsigned char)*ptr))
160 if (ptr[0] != 'i' || ptr[1] != 'n' ||
161 !isspace((unsigned char)ptr[2])) {
162 Parse_Error(level, "missing `in' in for");
168 while (*ptr && isspace((unsigned char)*ptr))
172 * Make a list with the remaining words
179 buf1 = Var_Subst(NULL, ptr, VAR_CMD, FALSE);
180 sub = Buf_GetAll(buf1, NULL);
181 Buf_Destroy(buf1, FALSE);
184 for (ptr = sub; *ptr && isspace((unsigned char)*ptr); ptr++)
187 for (wrd = ptr; *ptr; ptr++)
188 if (isspace((unsigned char)*ptr)) {
189 Buf_AppendRange(buf, wrd, ptr);
190 Buf_AddByte(buf, (Byte)'\0');
191 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
192 Buf_Destroy(buf, FALSE);
194 while (*ptr && isspace((unsigned char)*ptr))
198 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
200 Buf_AppendRange(buf, wrd, ptr);
201 Buf_AddByte(buf, (Byte)'\0');
202 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
203 Buf_Destroy(buf, FALSE);
205 Buf_Destroy(buf, TRUE);
209 forBuf = Buf_Init(0);
213 else if (*ptr == '.') {
215 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
218 if (strncmp(ptr, "endfor", 6) == 0 &&
219 (isspace((unsigned char)ptr[6]) || !ptr[6])) {
220 DEBUGF(FOR, ("For: end for %d\n", forLevel));
221 if (--forLevel < 0) {
222 Parse_Error(level, "for-less endfor");
226 else if (strncmp(ptr, "for", 3) == 0 &&
227 isspace((unsigned char)ptr[3])) {
229 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
234 Buf_Append(forBuf, line);
235 Buf_AddByte(forBuf, (Byte)'\n');
244 *-----------------------------------------------------------------------
246 * Expand the for loop for this index and push it in the Makefile
254 *-----------------------------------------------------------------------
257 ForExec(void *namep, void *argp)
264 Var_Set(arg->var, name, VAR_GLOBAL);
265 DEBUGF(FOR, ("--- %s = %s\n", arg->var, name));
267 buf = Var_Subst(arg->var,
268 (char *)Buf_GetAll(arg->buf, NULL), VAR_GLOBAL, FALSE);
269 str = Buf_GetAll(buf, NULL);
270 Buf_Destroy(buf, FALSE);
272 Parse_FromString(str, arg->lineno);
273 Var_Delete(arg->var, VAR_GLOBAL);
279 *-----------------------------------------------------------------------
281 * Run the for loop, immitating the actions of an include file
289 *-----------------------------------------------------------------------
296 if (forVar == NULL || forBuf == NULL)
301 /* move the forLst to the arg to get it free for nested for's */
303 Lst_Concat(&arg.lst, &forLst, LST_CONCLINK);
309 Lst_ForEach(&arg.lst, ForExec, &arg);
312 Lst_Destroy(&arg.lst, free);
313 Buf_Destroy(arg.buf, TRUE);