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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 1.35 2005/02/28 12:17:37 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
126 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
129 * If we are not in a for loop quickly determine if
130 * the statement is a for.
132 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
133 !isspace((unsigned char)ptr[3]))
138 * we found a for loop, and now we are going to parse it.
140 while (*ptr && isspace((unsigned char)*ptr))
147 for (wrd = ptr; *ptr && !isspace((unsigned char)*ptr); ptr++)
149 Buf_AppendRange(buf, wrd, ptr);
151 forVar = (char *)Buf_GetAll(buf, &varlen);
153 /* XXXHB Buf_Destroy(buf, TRUE) */
154 Parse_Error(level, "missing variable in for");
157 Buf_Destroy(buf, FALSE);
159 while (*ptr && isspace((unsigned char)*ptr))
165 if (ptr[0] != 'i' || ptr[1] != 'n' ||
166 !isspace((unsigned char)ptr[2])) {
167 /* XXXHB free(forVar) */
168 Parse_Error(level, "missing `in' in for");
174 while (*ptr && isspace((unsigned char)*ptr))
178 * Make a list with the remaining words
183 buf1 = Var_Subst(NULL, ptr, VAR_CMD, FALSE);
184 sub = Buf_GetAll(buf1, NULL);
185 Buf_Destroy(buf1, FALSE);
187 for (ptr = sub; *ptr && isspace((unsigned char)*ptr); ptr++)
190 for (wrd = ptr; *ptr; ptr++) {
191 if (isspace((unsigned char)*ptr)) {
192 Buf_AppendRange(buf, wrd, ptr);
193 Buf_AddByte(buf, (Byte)'\0');
194 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
195 Buf_Destroy(buf, FALSE);
197 while (*ptr && isspace((unsigned char)*ptr))
202 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
204 Buf_AppendRange(buf, wrd, ptr);
205 Buf_AddByte(buf, (Byte)'\0');
206 Lst_AtFront(&forLst, Buf_GetAll(buf, &varlen));
207 Buf_Destroy(buf, FALSE);
209 Buf_Destroy(buf, TRUE);
213 forBuf = Buf_Init(0);
220 * Need to check for 'endfor' and 'for' to find the end
221 * of our loop or to find embedded for loops.
223 for (ptr++; *ptr && isspace((unsigned char)*ptr); ptr++)
226 if (strncmp(ptr, "endfor", 6) == 0 &&
227 (isspace((unsigned char)ptr[6]) || !ptr[6])) {
228 DEBUGF(FOR, ("For: end for %d\n", forLevel));
229 if (--forLevel < 0) {
230 Parse_Error(level, "for-less endfor");
234 } else if (strncmp(ptr, "for", 3) == 0 &&
235 isspace((unsigned char)ptr[3])) {
237 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
243 * Still in loop - append the line
245 Buf_Append(forBuf, line);
246 Buf_AddByte(forBuf, (Byte)'\n');
254 *-----------------------------------------------------------------------
256 * Run the for loop, immitating the actions of an include file
262 * The values of the variables forLst, forVar and forBuf are freed.
264 *-----------------------------------------------------------------------
269 Lst values; /* list of values for the variable */
270 char *var; /* the variable's name */
271 Buffer *buf; /* the contents of the for loop */
272 const char *val; /* current value of loop variable */
277 if (forVar == NULL || forBuf == NULL)
280 /* copy the global variables to have them free for embedded fors */
284 Lst_Concat(&values, &forLst, LST_CONCLINK);
289 LST_FOREACH(ln, &values) {
291 Var_Set(var, val, VAR_GLOBAL);
293 DEBUGF(FOR, ("--- %s = %s\n", var, val));
294 buf1 = Var_Subst(var, (char *)Buf_GetAll(buf, NULL),
296 str = Buf_GetAll(buf1, NULL);
297 Buf_Destroy(buf1, FALSE);
299 Parse_FromString(str, lineno);
300 Var_Delete(var, VAR_GLOBAL);
304 Lst_Destroy(&values, free);
305 Buf_Destroy(buf, TRUE);