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 * %sccs.include.redist.c% 9 */ 10 11 #ifndef lint 12 static char sccsid[] = "@(#)for.c 8.1 (Berkeley) 06/06/93"; 13 #endif /* not lint */ 14 15 /*- 16 * for.c -- 17 * Functions to handle loops in a makefile. 18 * 19 * Interface: 20 * For_Eval Evaluate the loop in the passed line. 21 * For_Run Run accumulated loop 22 * 23 */ 24 25 #include <ctype.h> 26 #include "make.h" 27 #include "hash.h" 28 #include "dir.h" 29 #include "buf.h" 30 31 /* 32 * For statements are of the form: 33 * 34 * .for <variable> in <varlist> 35 * ... 36 * .endfor 37 * 38 * The trick is to look for the matching end inside for for loop 39 * To do that, we count the current nesting level of the for loops. 40 * and the .endfor statements, accumulating all the statements between 41 * the initial .for loop and the matching .endfor; 42 * then we evaluate the for loop for each variable in the varlist. 43 */ 44 45 static int forLevel = 0; /* Nesting level */ 46 static char *forVar; /* Iteration variable */ 47 static Buffer forBuf; /* Commands in loop */ 48 static Lst forLst; /* List of items */ 49 50 /* 51 * State of a for loop. 52 */ 53 struct For { 54 Buffer buf; /* Unexpanded buffer */ 55 char* var; /* Index name */ 56 Lst lst; /* List of variables */ 57 }; 58 59 static int ForExec __P((char *, struct For *)); 60 61 62 63 64 /*- 65 *----------------------------------------------------------------------- 66 * For_Eval -- 67 * Evaluate the for loop in the passed line. The line 68 * looks like this: 69 * .for <variable> in <varlist> 70 * 71 * Results: 72 * TRUE: We found a for loop, or we are inside a for loop 73 * FALSE: We did not find a for loop, or we found the end of the for 74 * for loop. 75 * 76 * Side Effects: 77 * None. 78 * 79 *----------------------------------------------------------------------- 80 */ 81 int 82 For_Eval (line) 83 char *line; /* Line to parse */ 84 { 85 char *ptr = line, *sub, *wrd; 86 int level; /* Level at which to report errors. */ 87 88 level = PARSE_FATAL; 89 90 91 if (forLevel == 0) { 92 Buffer buf; 93 int varlen; 94 95 for (ptr++; *ptr && isspace(*ptr); ptr++) 96 continue; 97 /* 98 * If we are not in a for loop quickly determine if the statement is 99 * a for. 100 */ 101 if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' || !isspace(ptr[3])) 102 return FALSE; 103 ptr += 3; 104 105 /* 106 * we found a for loop, and now we are going to parse it. 107 */ 108 while (*ptr && isspace(*ptr)) 109 ptr++; 110 111 /* 112 * Grab the variable 113 */ 114 buf = Buf_Init(0); 115 for (wrd = ptr; *ptr && !isspace(*ptr); ptr++) 116 continue; 117 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd); 118 119 forVar = (char *) Buf_GetAll(buf, &varlen); 120 if (varlen == 0) { 121 Parse_Error (level, "missing variable in for"); 122 return 0; 123 } 124 Buf_Destroy(buf, FALSE); 125 126 while (*ptr && isspace(*ptr)) 127 ptr++; 128 129 /* 130 * Grab the `in' 131 */ 132 if (ptr[0] != 'i' || ptr[1] != 'n' || !isspace(ptr[2])) { 133 Parse_Error (level, "missing `in' in for"); 134 printf("%s\n", ptr); 135 return 0; 136 } 137 ptr += 3; 138 139 while (*ptr && isspace(*ptr)) 140 ptr++; 141 142 /* 143 * Make a list with the remaining words 144 */ 145 forLst = Lst_Init(FALSE); 146 buf = Buf_Init(0); 147 sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE); 148 149 #define ADDWORD() \ 150 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \ 151 Buf_AddByte(buf, (Byte) '\0'), \ 152 Lst_AtEnd(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \ 153 Buf_Destroy(buf, FALSE) 154 155 for (ptr = sub; *ptr && isspace(*ptr); ptr++) 156 continue; 157 158 for (wrd = ptr; *ptr; ptr++) 159 if (isspace(*ptr)) { 160 ADDWORD(); 161 buf = Buf_Init(0); 162 while (*ptr && isspace(*ptr)) 163 ptr++; 164 wrd = ptr--; 165 } 166 if (DEBUG(FOR)) 167 (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub); 168 if (ptr - wrd > 0) 169 ADDWORD(); 170 else 171 Buf_Destroy(buf, TRUE); 172 free((Address) sub); 173 174 forBuf = Buf_Init(0); 175 forLevel++; 176 return 1; 177 } 178 else if (*ptr == '.') { 179 180 for (ptr++; *ptr && isspace(*ptr); ptr++) 181 continue; 182 183 if (strncmp(ptr, "endfor", 6) == 0 && (isspace(ptr[6]) || !ptr[6])) { 184 if (DEBUG(FOR)) 185 (void) fprintf(stderr, "For: end for %d\n", forLevel); 186 if (--forLevel < 0) { 187 Parse_Error (level, "for-less endfor"); 188 return 0; 189 } 190 } 191 else if (strncmp(ptr, "for", 3) == 0 && isspace(ptr[3])) { 192 forLevel++; 193 if (DEBUG(FOR)) 194 (void) fprintf(stderr, "For: new loop %d\n", forLevel); 195 } 196 } 197 198 if (forLevel != 0) { 199 Buf_AddBytes(forBuf, strlen(line), (Byte *) line); 200 Buf_AddByte(forBuf, (Byte) '\n'); 201 return 1; 202 } 203 else { 204 return 0; 205 } 206 } 207 208 /*- 209 *----------------------------------------------------------------------- 210 * ForExec -- 211 * Expand the for loop for this index and push it in the Makefile 212 * 213 * Results: 214 * None. 215 * 216 * Side Effects: 217 * None. 218 * 219 *----------------------------------------------------------------------- 220 */ 221 static int 222 ForExec(name, arg) 223 char *name; 224 struct For *arg; 225 { 226 int len; 227 Var_Set(arg->var, name, VAR_GLOBAL); 228 if (DEBUG(FOR)) 229 (void) fprintf(stderr, "--- %s = %s\n", arg->var, name); 230 Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len), 231 VAR_GLOBAL, FALSE)); 232 Var_Delete(arg->var, VAR_GLOBAL); 233 234 return 0; 235 } 236 237 238 /*- 239 *----------------------------------------------------------------------- 240 * For_Run -- 241 * Run the for loop, immitating the actions of an include file 242 * 243 * Results: 244 * None. 245 * 246 * Side Effects: 247 * None. 248 * 249 *----------------------------------------------------------------------- 250 */ 251 void 252 For_Run() 253 { 254 struct For arg; 255 256 if (forVar == NULL || forBuf == NULL || forLst == NULL) 257 return; 258 arg.var = forVar; 259 arg.buf = forBuf; 260 arg.lst = forLst; 261 forVar = NULL; 262 forBuf = NULL; 263 forLst = NULL; 264 265 Lst_ForEach(arg.lst, ForExec, (ClientData) &arg); 266 267 free((Address)arg.var); 268 Lst_Destroy(arg.lst, free); 269 Buf_Destroy(arg.buf, TRUE); 270 } 271