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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 1.32 2005/02/23 21:07:43 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 # */
91 *-----------------------------------------------------------------------
93 * Evaluate the for loop in the passed line. The line
95 * .for <variable> in <varlist>
98 * TRUE: We found a for loop, or we are inside a for loop
99 * FALSE: We did not find a for loop, or we found the end of the for
105 *-----------------------------------------------------------------------
113 int level; /* Level at which to report errors. */
120 * maybe start of a for loop
125 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
128 * If we are not in a for loop quickly determine if
129 * the statement is a for.
131 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
132 !isspace((unsigned char)ptr[3]))
137 * we found a for loop, and now we are going to parse it.
139 while (*ptr && isspace((unsigned char)*ptr))
146 for (wrd = ptr; *ptr && !isspace((unsigned char)*ptr); ptr++)
148 Buf_AppendRange(buf, wrd, ptr);
150 forVar = (char *)Buf_GetAll(buf, &varlen);
152 /* XXXHB Buf_Destroy(buf, TRUE) */
153 Parse_Error(level, "missing variable in for");
156 Buf_Destroy(buf, FALSE);
158 while (*ptr && isspace((unsigned char)*ptr))
164 if (ptr[0] != 'i' || ptr[1] != 'n' ||
165 !isspace((unsigned char)ptr[2])) {
166 /* XXXHB free(forVar) */
167 Parse_Error(level, "missing `in' in for");
173 while (*ptr && isspace((unsigned char)*ptr))
177 * Make a list with the remaining words
184 buf1 = Var_Subst(NULL, ptr, VAR_CMD, FALSE);
185 sub = Buf_GetAll(buf1, NULL);
186 Buf_Destroy(buf1, FALSE);
189 for (ptr = sub; *ptr && isspace((unsigned char)*ptr); ptr++)
192 for (wrd = ptr; *ptr; ptr++) {
193 if (isspace((unsigned char)*ptr)) {
194 Buf_AppendRange(buf, wrd, ptr);
195 Buf_AddByte(buf, (Byte)'\0');
196 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
197 Buf_Destroy(buf, FALSE);
199 while (*ptr && isspace((unsigned char)*ptr))
204 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
206 Buf_AppendRange(buf, wrd, ptr);
207 Buf_AddByte(buf, (Byte)'\0');
208 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
209 Buf_Destroy(buf, FALSE);
211 Buf_Destroy(buf, TRUE);
215 forBuf = Buf_Init(0);
222 * Need to check for 'endfor' and 'for' to find the end
223 * of our loop or to find embedded for loops.
225 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
228 if (strncmp(ptr, "endfor", 6) == 0 &&
229 (isspace((unsigned char)ptr[6]) || !ptr[6])) {
230 DEBUGF(FOR, ("For: end for %d\n", forLevel));
231 if (--forLevel < 0) {
232 Parse_Error(level, "for-less endfor");
236 } else if (strncmp(ptr, "for", 3) == 0 &&
237 isspace((unsigned char)ptr[3])) {
239 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
245 * Still in loop - append the line
247 Buf_Append(forBuf, line);
248 Buf_AddByte(forBuf, (Byte)'\n');
256 *-----------------------------------------------------------------------
258 * Run the for loop, immitating the actions of an include file
264 * The values of the variables forLst, forVar and forBuf are freed.
266 *-----------------------------------------------------------------------
271 Lst values; /* list of values for the variable */
272 char *var; /* the variable's name */
273 Buffer *buf; /* the contents of the for loop */
274 const char *val; /* current value of loop variable */
280 if (forVar == NULL || forBuf == NULL)
283 /* copy the global variables to have them free for embedded fors */
287 Lst_Concat(&values, &forLst, LST_CONCLINK);
292 LST_FOREACH(ln, &values) {
294 Var_Set(var, val, VAR_GLOBAL);
296 DEBUGF(FOR, ("--- %s = %s\n", var, val));
298 buf2 = Var_Subst(var,
299 (char *)Buf_GetAll(buf, NULL),
301 str = Buf_GetAll(buf2, NULL);
302 Buf_Destroy(buf2, FALSE);
304 Parse_FromString(str, lineno);
305 Var_Delete(var, VAR_GLOBAL);
309 Lst_Destroy(&values, free);
310 Buf_Destroy(buf, TRUE);