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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 1.5 2004/11/12 22:02:51 dillon 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 */
85 static int ForExec(void *, void *);
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 *-----------------------------------------------------------------------
109 char *line; /* Line to parse */
111 char *ptr = line, *sub, *wrd;
112 int level; /* Level at which to report errors. */
121 for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
124 * If we are not in a for loop quickly determine if the statement is
127 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
128 !isspace((unsigned char) ptr[3]))
133 * we found a for loop, and now we are going to parse it.
135 while (*ptr && isspace((unsigned char) *ptr))
142 for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++)
144 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd);
146 forVar = (char *) Buf_GetAll(buf, &varlen);
148 Parse_Error (level, "missing variable in for");
151 Buf_Destroy(buf, FALSE);
153 while (*ptr && isspace((unsigned char) *ptr))
159 if (ptr[0] != 'i' || ptr[1] != 'n' ||
160 !isspace((unsigned char) ptr[2])) {
161 Parse_Error (level, "missing `in' in for");
167 while (*ptr && isspace((unsigned char) *ptr))
171 * Make a list with the remaining words
173 forLst = Lst_Init(FALSE);
175 sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
178 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
179 Buf_AddByte(buf, (Byte) '\0'), \
180 Lst_AtFront(forLst, (void *) Buf_GetAll(buf, &varlen)), \
181 Buf_Destroy(buf, FALSE)
183 for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
186 for (wrd = ptr; *ptr; ptr++)
187 if (isspace((unsigned char) *ptr)) {
190 while (*ptr && isspace((unsigned char) *ptr))
195 (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub);
199 Buf_Destroy(buf, TRUE);
202 forBuf = Buf_Init(0);
206 else if (*ptr == '.') {
208 for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
211 if (strncmp(ptr, "endfor", 6) == 0 &&
212 (isspace((unsigned char) ptr[6]) || !ptr[6])) {
214 (void) fprintf(stderr, "For: end for %d\n", forLevel);
215 if (--forLevel < 0) {
216 Parse_Error (level, "for-less endfor");
220 else if (strncmp(ptr, "for", 3) == 0 &&
221 isspace((unsigned char) ptr[3])) {
224 (void) fprintf(stderr, "For: new loop %d\n", forLevel);
229 Buf_AddBytes(forBuf, strlen(line), (Byte *) line);
230 Buf_AddByte(forBuf, (Byte) '\n');
239 *-----------------------------------------------------------------------
241 * Expand the for loop for this index and push it in the Makefile
249 *-----------------------------------------------------------------------
256 char *name = (char *) namep;
257 For *arg = (For *) argp;
259 Var_Set(arg->var, name, VAR_GLOBAL);
261 (void) fprintf(stderr, "--- %s = %s\n", arg->var, name);
262 Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len),
264 Var_Delete(arg->var, VAR_GLOBAL);
271 *-----------------------------------------------------------------------
273 * Run the for loop, immitating the actions of an include file
281 *-----------------------------------------------------------------------
288 if (forVar == NULL || forBuf == NULL || forLst == NULL)
297 Lst_ForEach(arg.lst, ForExec, (void *) &arg);
300 Lst_Destroy(arg.lst, (void (*)(void *)) free);
301 Buf_Destroy(arg.buf, TRUE);