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Diffstat (limited to 'usr.bin/make/for.c')
| -rw-r--r-- | usr.bin/make/for.c | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/usr.bin/make/for.c b/usr.bin/make/for.c new file mode 100644 index 000000000000..650240179458 --- /dev/null +++ b/usr.bin/make/for.c @@ -0,0 +1,298 @@ +/* + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Christos Zoulas. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)for.c 8.1 (Berkeley) 6/6/93 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/*- + * for.c -- + * Functions to handle loops in a makefile. + * + * Interface: + * For_Eval Evaluate the loop in the passed line. + * For_Run Run accumulated loop + * + */ + +#include <ctype.h> +#include "make.h" +#include "hash.h" +#include "dir.h" +#include "buf.h" + +/* + * For statements are of the form: + * + * .for <variable> in <varlist> + * ... + * .endfor + * + * The trick is to look for the matching end inside for for loop + * To do that, we count the current nesting level of the for loops. + * and the .endfor statements, accumulating all the statements between + * the initial .for loop and the matching .endfor; + * then we evaluate the for loop for each variable in the varlist. + */ + +static int forLevel = 0; /* Nesting level */ +static char *forVar; /* Iteration variable */ +static Buffer forBuf; /* Commands in loop */ +static Lst forLst; /* List of items */ + +/* + * State of a for loop. + */ +typedef struct _For { + Buffer buf; /* Unexpanded buffer */ + char* var; /* Index name */ + Lst lst; /* List of variables */ + int lineno; /* Line # */ +} For; + +static int ForExec(void *, void *); + + + + +/*- + *----------------------------------------------------------------------- + * For_Eval -- + * Evaluate the for loop in the passed line. The line + * looks like this: + * .for <variable> in <varlist> + * + * Results: + * TRUE: We found a for loop, or we are inside a for loop + * FALSE: We did not find a for loop, or we found the end of the for + * for loop. + * + * Side Effects: + * None. + * + *----------------------------------------------------------------------- + */ +int +For_Eval (char *line) +{ + char *ptr = line, *sub, *wrd; + int level; /* Level at which to report errors. */ + + level = PARSE_FATAL; + + + if (forLevel == 0) { + Buffer buf; + int varlen; + + for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++) + continue; + /* + * If we are not in a for loop quickly determine if the statement is + * a for. + */ + if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' || + !isspace((unsigned char) ptr[3])) + return FALSE; + ptr += 3; + + /* + * we found a for loop, and now we are going to parse it. + */ + while (*ptr && isspace((unsigned char) *ptr)) + ptr++; + + /* + * Grab the variable + */ + buf = Buf_Init(0); + for (wrd = ptr; *ptr && !isspace((unsigned char) *ptr); ptr++) + continue; + Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd); + + forVar = (char *) Buf_GetAll(buf, &varlen); + if (varlen == 0) { + Parse_Error (level, "missing variable in for"); + return 0; + } + Buf_Destroy(buf, FALSE); + + while (*ptr && isspace((unsigned char) *ptr)) + ptr++; + + /* + * Grab the `in' + */ + if (ptr[0] != 'i' || ptr[1] != 'n' || + !isspace((unsigned char) ptr[2])) { + Parse_Error (level, "missing `in' in for"); + printf("%s\n", ptr); + return 0; + } + ptr += 3; + + while (*ptr && isspace((unsigned char) *ptr)) + ptr++; + + /* + * Make a list with the remaining words + */ + forLst = Lst_Init(FALSE); + buf = Buf_Init(0); + sub = Var_Subst(NULL, ptr, VAR_CMD, FALSE); + +#define ADDWORD() \ + Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \ + Buf_AddByte(buf, (Byte) '\0'), \ + Lst_AtFront(forLst, (void *) Buf_GetAll(buf, &varlen)), \ + Buf_Destroy(buf, FALSE) + + for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++) + continue; + + for (wrd = ptr; *ptr; ptr++) + if (isspace((unsigned char) *ptr)) { + ADDWORD(); + buf = Buf_Init(0); + while (*ptr && isspace((unsigned char) *ptr)) + ptr++; + wrd = ptr--; + } + DEBUGF(FOR, ("For: Iterator %s List %s\n", forVar, sub)); + if (ptr - wrd > 0) + ADDWORD(); + else + Buf_Destroy(buf, TRUE); + free(sub); + + forBuf = Buf_Init(0); + forLevel++; + return 1; + } + else if (*ptr == '.') { + + for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++) + continue; + + if (strncmp(ptr, "endfor", 6) == 0 && + (isspace((unsigned char) ptr[6]) || !ptr[6])) { + DEBUGF(FOR, ("For: end for %d\n", forLevel)); + if (--forLevel < 0) { + Parse_Error (level, "for-less endfor"); + return 0; + } + } + else if (strncmp(ptr, "for", 3) == 0 && + isspace((unsigned char) ptr[3])) { + forLevel++; + DEBUGF(FOR, ("For: new loop %d\n", forLevel)); + } + } + + if (forLevel != 0) { + Buf_AddBytes(forBuf, strlen(line), (Byte *) line); + Buf_AddByte(forBuf, (Byte) '\n'); + return 1; + } + else { + return 0; + } +} + +/*- + *----------------------------------------------------------------------- + * ForExec -- + * Expand the for loop for this index and push it in the Makefile + * + * Results: + * None. + * + * Side Effects: + * None. + * + *----------------------------------------------------------------------- + */ +static int +ForExec(void *namep, void *argp) +{ + char *name = (char *) namep; + For *arg = (For *) argp; + int len; + Var_Set(arg->var, name, VAR_GLOBAL); + DEBUGF(FOR, ("--- %s = %s\n", arg->var, name)); + Parse_FromString(Var_Subst(arg->var, (char *) Buf_GetAll(arg->buf, &len), + VAR_GLOBAL, FALSE), arg->lineno); + Var_Delete(arg->var, VAR_GLOBAL); + + return 0; +} + + +/*- + *----------------------------------------------------------------------- + * For_Run -- + * Run the for loop, immitating the actions of an include file + * + * Results: + * None. + * + * Side Effects: + * None. + * + *----------------------------------------------------------------------- + */ +void +For_Run(int lineno) +{ + For arg; + + if (forVar == NULL || forBuf == NULL || forLst == NULL) + return; + arg.var = forVar; + arg.buf = forBuf; + arg.lst = forLst; + arg.lineno = lineno; + forVar = NULL; + forBuf = NULL; + forLst = NULL; + + Lst_ForEach(arg.lst, ForExec, (void *) &arg); + + free(arg.var); + Lst_Destroy(arg.lst, (void (*)(void *)) free); + Buf_Destroy(arg.buf, TRUE); +} |