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36 * @(#)for.c 8.1 (Berkeley) 6/6/93
37 * $FreeBSD: src/usr.bin/make/for.c,v 1.10 1999/09/11 13:08:01 hoek Exp $
38 * $DragonFly: src/usr.bin/make/for.c,v 1.16 2004/12/17 08:13:30 okumoto Exp $
43 * Functions to handle loops in a makefile.
46 * For_Eval Evaluate the loop in the passed line.
47 * For_Run Run accumulated loop
58 * For statements are of the form:
60 * .for <variable> in <varlist>
64 * The trick is to look for the matching end inside for for loop
65 * To do that, we count the current nesting level of the for loops.
66 * and the .endfor statements, accumulating all the statements between
67 * the initial .for loop and the matching .endfor;
68 * then we evaluate the for loop for each variable in the varlist.
71 static int forLevel = 0; /* Nesting level */
72 static char *forVar; /* Iteration variable */
73 static Buffer forBuf; /* Commands in loop */
74 static Lst forLst; /* List of items */
77 * State of a for loop.
80 Buffer buf; /* Unexpanded buffer */
81 char* var; /* Index name */
82 Lst lst; /* List of variables */
83 int lineno; /* Line # */
86 static int ForExec(void *, void *);
89 *-----------------------------------------------------------------------
91 * Evaluate the for loop in the passed line. The line
93 * .for <variable> in <varlist>
96 * TRUE: We found a for loop, or we are inside a for loop
97 * FALSE: We did not find a for loop, or we found the end of the for
103 *-----------------------------------------------------------------------
108 char *ptr = line, *sub, *wrd;
109 int level; /* Level at which to report errors. */
118 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
121 * If we are not in a for loop quickly determine if the statement is
124 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
125 !isspace((unsigned char)ptr[3]))
130 * we found a for loop, and now we are going to parse it.
132 while (*ptr && isspace((unsigned char)*ptr))
139 for (wrd = ptr; *ptr && !isspace((unsigned char)*ptr); ptr++)
141 Buf_AddBytes(buf, ptr - wrd, (Byte *)wrd);
143 forVar = (char *)Buf_GetAll(buf, &varlen);
145 Parse_Error(level, "missing variable in for");
148 Buf_Destroy(buf, FALSE);
150 while (*ptr && isspace((unsigned char)*ptr))
156 if (ptr[0] != 'i' || ptr[1] != 'n' ||
157 !isspace((unsigned char)ptr[2])) {
158 Parse_Error(level, "missing `in' in for");
164 while (*ptr && isspace((unsigned char)*ptr))
168 * Make a list with the remaining words
172 sub = Var_Subst(NULL, ptr, VAR_CMD, FALSE);
175 Buf_AddBytes(buf, ptr - wrd, (Byte *)wrd), \
176 Buf_AddByte(buf, (Byte)'\0'), \
177 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen)), \
178 Buf_Destroy(buf, FALSE)
180 for (ptr = sub; *ptr && isspace((unsigned char)*ptr); ptr++)
183 for (wrd = ptr; *ptr; ptr++)
184 if (isspace((unsigned char)*ptr)) {
187 while (*ptr && isspace((unsigned char)*ptr))
191 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
195 Buf_Destroy(buf, TRUE);
198 forBuf = Buf_Init(0);
202 else if (*ptr == '.') {
204 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
207 if (strncmp(ptr, "endfor", 6) == 0 &&
208 (isspace((unsigned char)ptr[6]) || !ptr[6])) {
209 DEBUGF(FOR, ("For: end for %d\n", forLevel));
210 if (--forLevel < 0) {
211 Parse_Error(level, "for-less endfor");
215 else if (strncmp(ptr, "for", 3) == 0 &&
216 isspace((unsigned char)ptr[3])) {
218 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
223 Buf_AddBytes(forBuf, strlen(line), (Byte *)line);
224 Buf_AddByte(forBuf, (Byte)'\n');
233 *-----------------------------------------------------------------------
235 * Expand the for loop for this index and push it in the Makefile
243 *-----------------------------------------------------------------------
246 ForExec(void *namep, void *argp)
252 Var_Set(arg->var, name, VAR_GLOBAL);
253 DEBUGF(FOR, ("--- %s = %s\n", arg->var, name));
254 Parse_FromString(Var_Subst(arg->var, (char *)Buf_GetAll(arg->buf, &len),
255 VAR_GLOBAL, FALSE), arg->lineno);
256 Var_Delete(arg->var, VAR_GLOBAL);
262 *-----------------------------------------------------------------------
264 * Run the for loop, immitating the actions of an include file
272 *-----------------------------------------------------------------------
279 if (forVar == NULL || forBuf == NULL)
284 /* move the forLst to the arg to get it free for nested for's */
286 Lst_Concat(&arg.lst, &forLst, LST_CONCLINK);
292 Lst_ForEach(&arg.lst, ForExec, &arg);
295 Lst_Destroy(&arg.lst, free);
296 Buf_Destroy(arg.buf, TRUE);