1 /* $NetBSD: for.c,v 1.5 1997/07/01 21:17:19 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1992, The Regents of the University of California. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 6/6/93"; 40 #else 41 __RCSID("$NetBSD: for.c,v 1.5 1997/07/01 21:17:19 christos Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 /*- 46 * for.c -- 47 * Functions to handle loops in a makefile. 48 * 49 * Interface: 50 * For_Eval Evaluate the loop in the passed line. 51 * For_Run Run accumulated loop 52 * 53 */ 54 55 #include <ctype.h> 56 #include "make.h" 57 #include "hash.h" 58 #include "dir.h" 59 #include "buf.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 * State of a for loop. 82 */ 83 typedef struct _For { 84 Buffer buf; /* Unexpanded buffer */ 85 char* var; /* Index name */ 86 Lst lst; /* List of variables */ 87 } For; 88 89 static int ForExec __P((ClientData, ClientData)); 90 91 92 93 94 /*- 95 *----------------------------------------------------------------------- 96 * For_Eval -- 97 * Evaluate the for loop in the passed line. The line 98 * looks like this: 99 * .for <variable> in <varlist> 100 * 101 * Results: 102 * TRUE: We found a for loop, or we are inside a for loop 103 * FALSE: We did not find a for loop, or we found the end of the for 104 * for loop. 105 * 106 * Side Effects: 107 * None. 108 * 109 *----------------------------------------------------------------------- 110 */ 111 int 112 For_Eval (line) 113 char *line; /* Line to parse */ 114 { 115 char *ptr = line, *sub, *wrd; 116 int level; /* Level at which to report errors. */ 117 118 level = PARSE_FATAL; 119 120 121 if (forLevel == 0) { 122 Buffer buf; 123 int varlen; 124 125 for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++) 126 continue; 127 /* 128 * If we are not in a for loop quickly determine if the statement is 129 * a for. 130 */ 131 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' || 132 !isspace((unsigned char) ptr[3])) 133 return FALSE; 134 ptr += 3; 135 136 /* 137 * we found a for loop, and now we are going to parse it. 138 */ 139 while (*ptr && isspace((unsigned char) *ptr)) 140 ptr++; 141 142 /* 143 * Grab the variable 144 */ 145 buf = Buf_Init(0); 146 for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++) 147 continue; 148 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd); 149 150 forVar = (char *) Buf_GetAll(buf, &varlen); 151 if (varlen == 0) { 152 Parse_Error (level, "missing variable in for"); 153 return 0; 154 } 155 Buf_Destroy(buf, FALSE); 156 157 while (*ptr && isspace((unsigned char) *ptr)) 158 ptr++; 159 160 /* 161 * Grab the `in' 162 */ 163 if (ptr[0] != 'i' || ptr[1] != 'n' || 164 !isspace((unsigned char) ptr[2])) { 165 Parse_Error (level, "missing `in' in for"); 166 printf("%s\n", ptr); 167 return 0; 168 } 169 ptr += 3; 170 171 while (*ptr && isspace((unsigned char) *ptr)) 172 ptr++; 173 174 /* 175 * Make a list with the remaining words 176 */ 177 forLst = Lst_Init(FALSE); 178 buf = Buf_Init(0); 179 sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE); 180 181 #define ADDWORD() \ 182 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \ 183 Buf_AddByte(buf, (Byte) '\0'), \ 184 Lst_AtFront(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \ 185 Buf_Destroy(buf, FALSE) 186 187 for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++) 188 continue; 189 190 for (wrd = ptr; *ptr; ptr++) 191 if (isspace((unsigned char) *ptr)) { 192 ADDWORD(); 193 buf = Buf_Init(0); 194 while (*ptr && isspace((unsigned char) *ptr)) 195 ptr++; 196 wrd = ptr--; 197 } 198 if (DEBUG(FOR)) 199 (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub); 200 if (ptr - wrd > 0) 201 ADDWORD(); 202 else 203 Buf_Destroy(buf, TRUE); 204 free((Address) sub); 205 206 forBuf = Buf_Init(0); 207 forLevel++; 208 return 1; 209 } 210 else if (*ptr == '.') { 211 212 for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++) 213 continue; 214 215 if (strncmp(ptr, "endfor", 6) == 0 && 216 (isspace((unsigned char) ptr[6]) || !ptr[6])) { 217 if (DEBUG(FOR)) 218 (void) fprintf(stderr, "For: end for %d\n", forLevel); 219 if (--forLevel < 0) { 220 Parse_Error (level, "for-less endfor"); 221 return 0; 222 } 223 } 224 else if (strncmp(ptr, "for", 3) == 0 && 225 isspace((unsigned char) ptr[3])) { 226 forLevel++; 227 if (DEBUG(FOR)) 228 (void) fprintf(stderr, "For: new loop %d\n", forLevel); 229 } 230 } 231 232 if (forLevel != 0) { 233 Buf_AddBytes(forBuf, strlen(line), (Byte *) line); 234 Buf_AddByte(forBuf, (Byte) '\n'); 235 return 1; 236 } 237 else { 238 return 0; 239 } 240 } 241 242 /*- 243 *----------------------------------------------------------------------- 244 * ForExec -- 245 * Expand the for loop for this index and push it in the Makefile 246 * 247 * Results: 248 * None. 249 * 250 * Side Effects: 251 * None. 252 * 253 *----------------------------------------------------------------------- 254 */ 255 static int 256 ForExec(namep, argp) 257 ClientData namep; 258 ClientData argp; 259 { 260 char *name = (char *) namep; 261 For *arg = (For *) argp; 262 int len; 263 Var_Set(arg->var, name, VAR_GLOBAL); 264 if (DEBUG(FOR)) 265 (void) fprintf(stderr, "--- %s = %s\n", arg->var, name); 266 Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len), 267 VAR_GLOBAL, FALSE)); 268 Var_Delete(arg->var, VAR_GLOBAL); 269 270 return 0; 271 } 272 273 274 /*- 275 *----------------------------------------------------------------------- 276 * For_Run -- 277 * Run the for loop, immitating the actions of an include file 278 * 279 * Results: 280 * None. 281 * 282 * Side Effects: 283 * None. 284 * 285 *----------------------------------------------------------------------- 286 */ 287 void 288 For_Run() 289 { 290 For arg; 291 292 if (forVar == NULL || forBuf == NULL || forLst == NULL) 293 return; 294 arg.var = forVar; 295 arg.buf = forBuf; 296 arg.lst = forLst; 297 forVar = NULL; 298 forBuf = NULL; 299 forLst = NULL; 300 301 Lst_ForEach(arg.lst, ForExec, (ClientData) &arg); 302 303 free((Address)arg.var); 304 Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free); 305 Buf_Destroy(arg.buf, TRUE); 306 } 307