1 /*-
2 * Copyright (c) 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Christos Zoulas.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)for.c 8.1 (Berkeley) 6/6/93
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 /*-
39 * for.c --
40 * Functions to handle loops in a makefile.
41 *
42 * Interface:
43 * For_Eval Evaluate the loop in the passed line.
44 * For_Run Run accumulated loop
45 *
46 */
47
48 #include <ctype.h>
49 #include <stdlib.h>
50 #include <string.h>
51
52 #include "buf.h"
53 #include "for.h"
54 #include "globals.h"
55 #include "lst.h"
56 #include "parse.h"
57 #include "str.h"
58 #include "util.h"
59 #include "var.h"
60
61 /*
62 * For statements are of the form:
63 *
64 * .for <variable> in <varlist>
65 * ...
66 * .endfor
67 *
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.
73 */
74
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 */
79
80 /**
81 * For_For
82 * Evaluate the for loop in the passed line. The line
83 * looks like this:
84 * .for <variable> in <varlist>
85 * The line pointer points just behind the for.
86 *
87 * Results:
88 * TRUE: Syntax ok.
89 * FALSE: Syntax error.
90 */
91 Boolean
For_For(char * line)92 For_For(char *line)
93 {
94 char *ptr;
95 char *wrd;
96 char *sub;
97 Buffer *buf;
98 size_t varlen;
99 int i;
100 ArgArray words;
101
102 ptr = line;
103
104 /*
105 * Skip space between for and the variable.
106 */
107 for (ptr++; *ptr && isspace((u_char)*ptr); ptr++)
108 ;
109
110 /*
111 * Grab the variable
112 */
113 for (wrd = ptr; *ptr && !isspace((u_char)*ptr); ptr++)
114 ;
115
116 buf = Buf_Init(0);
117 Buf_AppendRange(buf, wrd, ptr);
118 forVar = Buf_GetAll(buf, &varlen);
119
120 if (varlen == 0) {
121 Buf_Destroy(buf, TRUE);
122 Parse_Error(PARSE_FATAL, "missing variable in for");
123 return (FALSE);
124 }
125 Buf_Destroy(buf, FALSE);
126
127 /*
128 * Skip to 'in'.
129 */
130 while (*ptr && isspace((u_char)*ptr))
131 ptr++;
132
133 /*
134 * Grab the `in'
135 */
136 if (ptr[0] != 'i' || ptr[1] != 'n' || !isspace((u_char)ptr[2])) {
137 free(forVar);
138 Parse_Error(PARSE_FATAL, "missing `in' in for");
139 fprintf(stderr, "%s\n", ptr);
140 return (FALSE);
141 }
142 ptr += 3;
143
144 /*
145 * Skip to values
146 */
147 while (*ptr && isspace((u_char)*ptr))
148 ptr++;
149
150 /*
151 * Make a list with the remaining words
152 */
153 sub = Buf_Peel(Var_Subst(ptr, VAR_CMD, FALSE));
154 brk_string(&words, sub, FALSE);
155 Lst_Init(&forLst);
156 for (i = 1; i < words.argc; i++) {
157 if (words.argv[i][0] != '\0')
158 Lst_AtFront(&forLst, estrdup(words.argv[i]));
159 }
160 ArgArray_Done(&words);
161 DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub));
162 free(sub);
163
164 forBuf = Buf_Init(0);
165 forLevel++;
166 return (TRUE);
167 }
168
169 /**
170 * For_Eval
171 * Eat a line of the .for body looking for embedded .for loops
172 * and the .endfor
173 */
174 Boolean
For_Eval(char * line)175 For_Eval(char *line)
176 {
177 char *ptr;
178
179 ptr = line;
180
181 if (*ptr == '.') {
182 /*
183 * Need to check for 'endfor' and 'for' to find the end
184 * of our loop or to find embedded for loops.
185 */
186 for (ptr++; *ptr != '\0' && isspace((u_char)*ptr); ptr++)
187 ;
188
189 /* XXX the isspace is wrong */
190 if (strncmp(ptr, "endfor", 6) == 0 &&
191 (isspace((u_char)ptr[6]) || ptr[6] == '\0')) {
192 DEBUGF(FOR, ("For: end for %d\n", forLevel));
193 if (forLevel == 0) {
194 /* should not be here */
195 abort();
196 }
197 forLevel--;
198
199 } else if (strncmp(ptr, "for", 3) == 0 &&
200 isspace((u_char)ptr[3])) {
201 forLevel++;
202 DEBUGF(FOR, ("For: new loop %d\n", forLevel));
203 }
204 }
205
206 if (forLevel != 0) {
207 /*
208 * Still in loop - append the line
209 */
210 Buf_Append(forBuf, line);
211 Buf_AddByte(forBuf, (Byte)'\n');
212 return (TRUE);
213 }
214
215 return (FALSE);
216 }
217
218 /*-
219 *-----------------------------------------------------------------------
220 * For_Run --
221 * Run the for loop, imitating the actions of an include file
222 *
223 * Results:
224 * None.
225 *
226 * Side Effects:
227 * The values of the variables forLst, forVar and forBuf are freed.
228 *
229 *-----------------------------------------------------------------------
230 */
231 void
For_Run(int lineno)232 For_Run(int lineno)
233 {
234 Lst values; /* list of values for the variable */
235 char *var; /* the variable's name */
236 Buffer *buf; /* the contents of the for loop */
237 const char *val; /* current value of loop variable */
238 LstNode *ln;
239 char *str;
240
241 if (forVar == NULL || forBuf == NULL)
242 return;
243
244 /* copy the global variables to have them free for embedded fors */
245 var = forVar;
246 buf = forBuf;
247 Lst_Init(&values);
248 Lst_Concat(&values, &forLst, LST_CONCLINK);
249
250 forVar = NULL;
251 forBuf = NULL;
252
253 LST_FOREACH(ln, &values) {
254 val = Lst_Datum(ln);
255 Var_SetGlobal(var, val);
256
257 DEBUGF(FOR, ("--- %s = %s\n", var, val));
258 str = Buf_Peel(Var_SubstOnly(var, Buf_Data(buf), FALSE));
259
260 Parse_FromString(str, lineno);
261 Var_Delete(var, VAR_GLOBAL);
262 }
263
264 free(var);
265 Lst_Destroy(&values, free);
266 Buf_Destroy(buf, TRUE);
267 }
268