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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 1.47 2005/09/24 07:38:03 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 */
82 * Evaluate the for loop in the passed line. The line
84 * .for <variable> in <varlist>
85 * The line pointer points just behind the for.
89 * false: Syntax error.
102 * Skip space between for and the variable.
104 for (ptr++; *ptr && isspace((u_char)*ptr); ptr++)
110 for (wrd = ptr; *ptr && !isspace((u_char)*ptr); ptr++)
114 Buf_AppendRange(buf, wrd, ptr);
115 forVar = Buf_Data(buf);
117 if (Buf_Size(buf) == 0) {
118 Buf_Destroy(buf, true);
119 Parse_Error(PARSE_FATAL, "missing variable in for");
122 Buf_Destroy(buf, false);
127 while (*ptr && isspace((u_char)*ptr))
133 if (ptr[0] != 'i' || ptr[1] != 'n' || !isspace((u_char)ptr[2])) {
135 Parse_Error(PARSE_FATAL, "missing `in' in for");
136 fprintf(stderr, "%s\n", ptr);
144 while (*ptr && isspace((u_char)*ptr))
148 * Make a list with the remaining words
150 sub = Buf_Peel(Var_Subst(ptr, VAR_CMD, false));
151 for (ptr = sub; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
156 for (wrd = ptr; *ptr != '\0'; ptr++) {
157 if (isspace((u_char)*ptr)) {
158 Buf_AppendRange(buf, wrd, ptr);
159 Lst_AtFront(&forLst, Buf_Peel(buf));
162 while (*ptr != '\0' && isspace((u_char)*ptr))
167 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
170 Buf_AppendRange(buf, wrd, ptr);
171 Lst_AtFront(&forLst, Buf_Peel(buf));
173 Buf_Destroy(buf, true);
177 forBuf = Buf_Init(0);
184 * Eat a line of the .for body looking for embedded .for loops
196 * Need to check for 'endfor' and 'for' to find the end
197 * of our loop or to find embedded for loops.
199 for (ptr++; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
202 /* XXX the isspace is wrong */
203 if (strncmp(ptr, "endfor", 6) == 0 &&
204 (isspace((u_char)ptr[6]) || ptr[6] == '\0')) {
205 DEBUGF(FOR, ("For: end for %d\n", forLevel));
207 /* should not be here */
212 } else if (strncmp(ptr, "for", 3) == 0 &&
213 isspace((u_char)ptr[3])) {
215 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
221 * Still in loop - append the line
223 Buf_Append(forBuf, line);
224 Buf_AddByte(forBuf, '\n');
232 *-----------------------------------------------------------------------
234 * Run the for loop, immitating the actions of an include file
240 * The values of the variables forLst, forVar and forBuf are freed.
242 *-----------------------------------------------------------------------
247 Lst values; /* list of values for the variable */
248 char *var; /* the variable's name */
249 Buffer *buf; /* the contents of the for loop */
250 const char *val; /* current value of loop variable */
254 if (forVar == NULL || forBuf == NULL)
257 /* copy the global variables to have them free for embedded fors */
261 Lst_Concat(&values, &forLst, LST_CONCLINK);
266 LST_FOREACH(ln, &values) {
268 Var_SetGlobal(var, val);
270 DEBUGF(FOR, ("--- %s = %s\n", var, val));
271 str = Buf_Peel(Var_SubstOnly(var, Buf_Data(buf), false));
273 Parse_FromString(str, lineno);
274 Var_Delete(var, VAR_GLOBAL);
278 Lst_Destroy(&values, free);
279 Buf_Destroy(buf, true);