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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 1.36 2005/03/12 09:58:06 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 *-----------------------------------------------------------------------
83 * Evaluate the for loop in the passed line. The line
85 * .for <variable> in <varlist>
88 * TRUE: We found a for loop, or we are inside a for loop
89 * FALSE: We did not find a for loop, or we found the end of the for
95 *-----------------------------------------------------------------------
103 int level; /* Level at which to report errors. */
110 * maybe start of a for loop
115 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
118 * If we are not in a for loop quickly determine if
119 * the statement is a for.
121 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
122 !isspace((unsigned char)ptr[3]))
127 * we found a for loop, and now we are going to parse it.
129 while (*ptr && isspace((unsigned char)*ptr))
136 for (wrd = ptr; *ptr && !isspace((unsigned char)*ptr); ptr++)
138 Buf_AppendRange(buf, wrd, ptr);
140 forVar = (char *)Buf_GetAll(buf, &varlen);
142 /* XXXHB Buf_Destroy(buf, TRUE) */
143 Parse_Error(level, "missing variable in for");
146 Buf_Destroy(buf, FALSE);
148 while (*ptr && isspace((unsigned char)*ptr))
154 if (ptr[0] != 'i' || ptr[1] != 'n' ||
155 !isspace((unsigned char)ptr[2])) {
156 /* XXXHB free(forVar) */
157 Parse_Error(level, "missing `in' in for");
163 while (*ptr && isspace((unsigned char)*ptr))
167 * Make a list with the remaining words
169 sub = Buf_Peel(Var_Subst(NULL, ptr, VAR_CMD, FALSE));
170 for (ptr = sub; *ptr && isspace((unsigned char)*ptr); ptr++)
175 for (wrd = ptr; *ptr != '\0'; ptr++) {
176 if (isspace((unsigned char)*ptr)) {
177 Buf_AppendRange(buf, wrd, ptr);
178 Lst_AtFront(&forLst, Buf_Peel(buf));
181 while (*ptr && isspace((unsigned char)*ptr))
186 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
188 Buf_AppendRange(buf, wrd, ptr);
189 Lst_AtFront(&forLst, Buf_Peel(buf));
191 Buf_Destroy(buf, TRUE);
195 forBuf = Buf_Init(0);
202 * Need to check for 'endfor' and 'for' to find the end
203 * of our loop or to find embedded for loops.
205 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
208 if (strncmp(ptr, "endfor", 6) == 0 &&
209 (isspace((unsigned char)ptr[6]) || !ptr[6])) {
210 DEBUGF(FOR, ("For: end for %d\n", forLevel));
211 if (--forLevel < 0) {
212 Parse_Error(level, "for-less endfor");
216 } else if (strncmp(ptr, "for", 3) == 0 &&
217 isspace((unsigned char)ptr[3])) {
219 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
225 * Still in loop - append the line
227 Buf_Append(forBuf, line);
228 Buf_AddByte(forBuf, (Byte)'\n');
236 *-----------------------------------------------------------------------
238 * Run the for loop, immitating the actions of an include file
244 * The values of the variables forLst, forVar and forBuf are freed.
246 *-----------------------------------------------------------------------
251 Lst values; /* list of values for the variable */
252 char *var; /* the variable's name */
253 Buffer *buf; /* the contents of the for loop */
254 const char *val; /* current value of loop variable */
258 if (forVar == NULL || forBuf == NULL)
261 /* copy the global variables to have them free for embedded fors */
265 Lst_Concat(&values, &forLst, LST_CONCLINK);
270 LST_FOREACH(ln, &values) {
272 Var_Set(var, val, VAR_GLOBAL);
274 DEBUGF(FOR, ("--- %s = %s\n", var, val));
275 str = Buf_Peel(Var_Subst(var, (char *)Buf_GetAll(buf, NULL),
278 Parse_FromString(str, lineno);
279 Var_Delete(var, VAR_GLOBAL);
283 Lst_Destroy(&values, free);
284 Buf_Destroy(buf, TRUE);