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 8.2 (Berkeley) 04/28/95"; 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 typedef struct _For { 54 Buffer buf; /* Unexpanded buffer */ 55 char* var; /* Index name */ 56 Lst lst; /* List of variables */ 57 } For; 58 59 static int ForExec __P((ClientData, ClientData)); 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((unsigned char) *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' || 102 !isspace((unsigned char) ptr[3])) 103 return FALSE; 104 ptr += 3; 105 106 /* 107 * we found a for loop, and now we are going to parse it. 108 */ 109 while (*ptr && isspace((unsigned char) *ptr)) 110 ptr++; 111 112 /* 113 * Grab the variable 114 */ 115 buf = Buf_Init(0); 116 for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++) 117 continue; 118 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd); 119 120 forVar = (char *) Buf_GetAll(buf, &varlen); 121 if (varlen == 0) { 122 Parse_Error (level, "missing variable in for"); 123 return 0; 124 } 125 Buf_Destroy(buf, FALSE); 126 127 while (*ptr && isspace((unsigned char) *ptr)) 128 ptr++; 129 130 /* 131 * Grab the `in' 132 */ 133 if (ptr[0] != 'i' || ptr[1] != 'n' || 134 !isspace((unsigned char) ptr[2])) { 135 Parse_Error (level, "missing `in' in for"); 136 printf("%s\n", ptr); 137 return 0; 138 } 139 ptr += 3; 140 141 while (*ptr && isspace((unsigned char) *ptr)) 142 ptr++; 143 144 /* 145 * Make a list with the remaining words 146 */ 147 forLst = Lst_Init(FALSE); 148 buf = Buf_Init(0); 149 sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE); 150 151 #define ADDWORD() \ 152 Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \ 153 Buf_AddByte(buf, (Byte) '\0'), \ 154 Lst_AtEnd(forLst, (ClientData) Buf_GetAll(buf, &varlen)), \ 155 Buf_Destroy(buf, FALSE) 156 157 for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++) 158 continue; 159 160 for (wrd = ptr; *ptr; ptr++) 161 if (isspace((unsigned char) *ptr)) { 162 ADDWORD(); 163 buf = Buf_Init(0); 164 while (*ptr && isspace((unsigned char) *ptr)) 165 ptr++; 166 wrd = ptr--; 167 } 168 if (DEBUG(FOR)) 169 (void) fprintf(stderr, "For: Iterator %s List %s\n", forVar, sub); 170 if (ptr - wrd > 0) 171 ADDWORD(); 172 else 173 Buf_Destroy(buf, TRUE); 174 free((Address) sub); 175 176 forBuf = Buf_Init(0); 177 forLevel++; 178 return 1; 179 } 180 else if (*ptr == '.') { 181 182 for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++) 183 continue; 184 185 if (strncmp(ptr, "endfor", 6) == 0 && 186 (isspace((unsigned char) ptr[6]) || !ptr[6])) { 187 if (DEBUG(FOR)) 188 (void) fprintf(stderr, "For: end for %d\n", forLevel); 189 if (--forLevel < 0) { 190 Parse_Error (level, "for-less endfor"); 191 return 0; 192 } 193 } 194 else if (strncmp(ptr, "for", 3) == 0 && 195 isspace((unsigned char) ptr[3])) { 196 forLevel++; 197 if (DEBUG(FOR)) 198 (void) fprintf(stderr, "For: new loop %d\n", forLevel); 199 } 200 } 201 202 if (forLevel != 0) { 203 Buf_AddBytes(forBuf, strlen(line), (Byte *) line); 204 Buf_AddByte(forBuf, (Byte) '\n'); 205 return 1; 206 } 207 else { 208 return 0; 209 } 210 } 211 212 /*- 213 *----------------------------------------------------------------------- 214 * ForExec -- 215 * Expand the for loop for this index and push it in the Makefile 216 * 217 * Results: 218 * None. 219 * 220 * Side Effects: 221 * None. 222 * 223 *----------------------------------------------------------------------- 224 */ 225 static int 226 ForExec(namep, argp) 227 ClientData namep; 228 ClientData argp; 229 { 230 char *name = (char *) namep; 231 For *arg = (For *) argp; 232 int len; 233 Var_Set(arg->var, name, VAR_GLOBAL); 234 if (DEBUG(FOR)) 235 (void) fprintf(stderr, "--- %s = %s\n", arg->var, name); 236 Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len), 237 VAR_GLOBAL, FALSE)); 238 Var_Delete(arg->var, VAR_GLOBAL); 239 240 return 0; 241 } 242 243 244 /*- 245 *----------------------------------------------------------------------- 246 * For_Run -- 247 * Run the for loop, immitating the actions of an include file 248 * 249 * Results: 250 * None. 251 * 252 * Side Effects: 253 * None. 254 * 255 *----------------------------------------------------------------------- 256 */ 257 void 258 For_Run() 259 { 260 For arg; 261 262 if (forVar == NULL || forBuf == NULL || forLst == NULL) 263 return; 264 arg.var = forVar; 265 arg.buf = forBuf; 266 arg.lst = forLst; 267 forVar = NULL; 268 forBuf = NULL; 269 forLst = NULL; 270 271 Lst_ForEach(arg.lst, ForExec, (ClientData) &arg); 272 273 free((Address)arg.var); 274 Lst_Destroy(arg.lst, (void (*) __P((ClientData))) free); 275 Buf_Destroy(arg.buf, TRUE); 276 } 277