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 75static int forLevel = 0; /* Nesting level */ 76static char *forVar; /* Iteration variable */ 77static Buffer *forBuf; /* Commands in loop */ 78static 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 */ 91Boolean 92For_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 */ 174Boolean 175For_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 */ 231void 232For_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