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Annotation of src/usr.bin/make/for.c, Revision 1.13

1.13    ! wiz         1: /*     $NetBSD: for.c,v 1.12 2002/03/12 20:15:15 christos Exp $        */
1.3       christos    2:
1.1       cgd         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:
1.6       lukem      36: #ifdef MAKE_BOOTSTRAP
1.13    ! wiz        37: static char rcsid[] = "$NetBSD: for.c,v 1.12 2002/03/12 20:15:15 christos Exp $";
1.6       lukem      38: #else
1.5       christos   39: #include <sys/cdefs.h>
1.1       cgd        40: #ifndef lint
1.3       christos   41: #if 0
1.4       christos   42: static char sccsid[] = "@(#)for.c      8.1 (Berkeley) 6/6/93";
1.3       christos   43: #else
1.13    ! wiz        44: __RCSID("$NetBSD: for.c,v 1.12 2002/03/12 20:15:15 christos Exp $");
1.3       christos   45: #endif
1.1       cgd        46: #endif /* not lint */
1.6       lukem      47: #endif
1.1       cgd        48:
                     49: /*-
                     50:  * for.c --
                     51:  *     Functions to handle loops in a makefile.
                     52:  *
                     53:  * Interface:
                     54:  *     For_Eval        Evaluate the loop in the passed line.
                     55:  *     For_Run         Run accumulated loop
                     56:  *
                     57:  */
                     58:
1.13    ! wiz        59: #include    <assert.h>
1.1       cgd        60: #include    <ctype.h>
1.13    ! wiz        61:
1.1       cgd        62: #include    "make.h"
                     63: #include    "hash.h"
                     64: #include    "dir.h"
                     65: #include    "buf.h"
                     66:
                     67: /*
                     68:  * For statements are of the form:
                     69:  *
                     70:  * .for <variable> in <varlist>
                     71:  * ...
                     72:  * .endfor
                     73:  *
                     74:  * The trick is to look for the matching end inside for for loop
                     75:  * To do that, we count the current nesting level of the for loops.
                     76:  * and the .endfor statements, accumulating all the statements between
1.4       christos   77:  * the initial .for loop and the matching .endfor;
1.1       cgd        78:  * then we evaluate the for loop for each variable in the varlist.
1.7       christos   79:  *
                     80:  * Note that any nested fors are just passed through; they get handled
                     81:  * recursively in For_Eval when we're expanding the enclosing for in
                     82:  * For_Run.
1.1       cgd        83:  */
                     84:
                     85: static int       forLevel = 0;         /* Nesting level        */
                     86:
                     87: /*
                     88:  * State of a for loop.
                     89:  */
1.2       jtc        90: typedef struct _For {
1.7       christos   91:     Buffer       buf;                  /* Body of loop         */
                     92:     char       **vars;                 /* Iteration variables  */
                     93:     int           nvars;               /* # of iteration vars  */
                     94:     Lst          lst;                  /* List of items        */
1.2       jtc        95: } For;
1.1       cgd        96:
1.7       christos   97: static For        accumFor;             /* Loop being accumulated */
1.1       cgd        98:
1.13    ! wiz        99: static void ForAddVar(const char *, size_t);
1.1       cgd       100:
                    101:
                    102: 
1.7       christos  103:
                    104: /*-
                    105:  *-----------------------------------------------------------------------
                    106:  * ForAddVar --
                    107:  *     Add an iteration variable to the currently accumulating for.
                    108:  *
                    109:  * Results: none
                    110:  * Side effects: no additional side effects.
                    111:  *-----------------------------------------------------------------------
                    112:  */
                    113: static void
1.13    ! wiz       114: ForAddVar(const char *data, size_t len)
1.7       christos  115: {
                    116:        Buffer buf;
1.8       simonb    117:        int varlen;
1.7       christos  118:
                    119:        buf = Buf_Init(0);
                    120:        Buf_AddBytes(buf, len, (Byte *) data);
                    121:
                    122:        accumFor.nvars++;
                    123:        accumFor.vars = erealloc(accumFor.vars, accumFor.nvars*sizeof(char *));
                    124:
                    125:        accumFor.vars[accumFor.nvars-1] = (char *) Buf_GetAll(buf, &varlen);
                    126:
                    127:        Buf_Destroy(buf, FALSE);
                    128: }
                    129:
1.1       cgd       130: /*-
                    131:  *-----------------------------------------------------------------------
                    132:  * For_Eval --
                    133:  *     Evaluate the for loop in the passed line. The line
                    134:  *     looks like this:
                    135:  *         .for <variable> in <varlist>
                    136:  *
1.13    ! wiz       137:  * Input:
        !           138:  *     line            Line to parse
        !           139:  *
1.1       cgd       140:  * Results:
                    141:  *     TRUE: We found a for loop, or we are inside a for loop
                    142:  *     FALSE: We did not find a for loop, or we found the end of the for
                    143:  *            for loop.
                    144:  *
                    145:  * Side Effects:
                    146:  *     None.
                    147:  *
                    148:  *-----------------------------------------------------------------------
                    149:  */
                    150: int
1.13    ! wiz       151: For_Eval(char *line)
1.1       cgd       152: {
1.7       christos  153:     char           *ptr = line, *sub, *in, *wrd;
1.1       cgd       154:     int                    level;      /* Level at which to report errors. */
                    155:
                    156:     level = PARSE_FATAL;
                    157:
                    158:
                    159:     if (forLevel == 0) {
                    160:        Buffer      buf;
                    161:        int         varlen;
1.12      christos  162:        static const char instr[] = "in";
1.1       cgd       163:
1.2       jtc       164:        for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
1.1       cgd       165:            continue;
                    166:        /*
                    167:         * If we are not in a for loop quickly determine if the statement is
                    168:         * a for.
                    169:         */
1.2       jtc       170:        if (ptr[0] != 'f' || ptr[1] != 'o' || ptr[2] != 'r' ||
                    171:            !isspace((unsigned char) ptr[3]))
1.1       cgd       172:            return FALSE;
                    173:        ptr += 3;
1.4       christos  174:
1.1       cgd       175:        /*
                    176:         * we found a for loop, and now we are going to parse it.
                    177:         */
1.2       jtc       178:        while (*ptr && isspace((unsigned char) *ptr))
1.1       cgd       179:            ptr++;
1.4       christos  180:
1.1       cgd       181:        /*
1.7       christos  182:         * Find the "in".
1.1       cgd       183:         */
1.7       christos  184:        for (in = ptr; *in; in++) {
                    185:            if (isspace((unsigned char) in[0]) && in[1]== 'i' &&
                    186:                in[2] == 'n' &&
                    187:                (in[3] == '\0' || isspace((unsigned char) in[3])))
                    188:                break;
                    189:        }
                    190:        if (*in == '\0') {
                    191:            Parse_Error(level, "missing `in' in for");
1.1       cgd       192:            return 0;
                    193:        }
                    194:
                    195:        /*
1.7       christos  196:         * Grab the variables.
1.1       cgd       197:         */
1.7       christos  198:        accumFor.vars = NULL;
                    199:
                    200:        while (ptr < in) {
                    201:            wrd = ptr;
                    202:            while (*ptr && !isspace((unsigned char) *ptr))
                    203:                ptr++;
                    204:            ForAddVar(wrd, ptr - wrd);
                    205:            while (*ptr && isspace((unsigned char) *ptr))
                    206:                ptr++;
                    207:        }
                    208:
                    209:        if (accumFor.nvars == 0) {
                    210:            Parse_Error(level, "no iteration variables in for");
1.1       cgd       211:            return 0;
                    212:        }
1.7       christos  213:
                    214:        /* At this point we should be pointing right at the "in" */
1.12      christos  215:        /*
                    216:         * compensate for hp/ux's brain damaged assert macro that
                    217:         * does not handle double quotes nicely.
                    218:         */
                    219:        assert(!memcmp(ptr, instr, 2));
1.7       christos  220:        ptr += 2;
1.1       cgd       221:
1.2       jtc       222:        while (*ptr && isspace((unsigned char) *ptr))
1.1       cgd       223:            ptr++;
                    224:
                    225:        /*
                    226:         * Make a list with the remaining words
                    227:         */
1.7       christos  228:        accumFor.lst = Lst_Init(FALSE);
1.1       cgd       229:        buf = Buf_Init(0);
1.4       christos  230:        sub = Var_Subst(NULL, ptr, VAR_GLOBAL, FALSE);
1.1       cgd       231:
                    232: #define ADDWORD() \
                    233:        Buf_AddBytes(buf, ptr - wrd, (Byte *) wrd), \
                    234:        Buf_AddByte(buf, (Byte) '\0'), \
1.7       christos  235:        Lst_AtFront(accumFor.lst, (ClientData) Buf_GetAll(buf, &varlen)), \
1.1       cgd       236:        Buf_Destroy(buf, FALSE)
                    237:
1.2       jtc       238:        for (ptr = sub; *ptr && isspace((unsigned char) *ptr); ptr++)
1.1       cgd       239:            continue;
                    240:
                    241:        for (wrd = ptr; *ptr; ptr++)
1.2       jtc       242:            if (isspace((unsigned char) *ptr)) {
1.1       cgd       243:                ADDWORD();
                    244:                buf = Buf_Init(0);
1.2       jtc       245:                while (*ptr && isspace((unsigned char) *ptr))
1.1       cgd       246:                    ptr++;
                    247:                wrd = ptr--;
                    248:            }
1.7       christos  249:        if (DEBUG(FOR)) {
                    250:            int i;
                    251:            for (i = 0; i < accumFor.nvars; i++) {
                    252:                (void) fprintf(stderr, "For: variable %s\n", accumFor.vars[i]);
                    253:            }
                    254:            (void) fprintf(stderr, "For: list %s\n", sub);
                    255:        }
1.4       christos  256:        if (ptr - wrd > 0)
1.1       cgd       257:            ADDWORD();
                    258:        else
                    259:            Buf_Destroy(buf, TRUE);
                    260:        free((Address) sub);
1.4       christos  261:
1.7       christos  262:        accumFor.buf = Buf_Init(0);
1.1       cgd       263:        forLevel++;
                    264:        return 1;
                    265:     }
                    266:     else if (*ptr == '.') {
                    267:
1.2       jtc       268:        for (ptr++; *ptr && isspace((unsigned char) *ptr); ptr++)
1.1       cgd       269:            continue;
                    270:
1.2       jtc       271:        if (strncmp(ptr, "endfor", 6) == 0 &&
                    272:            (isspace((unsigned char) ptr[6]) || !ptr[6])) {
1.1       cgd       273:            if (DEBUG(FOR))
                    274:                (void) fprintf(stderr, "For: end for %d\n", forLevel);
                    275:            if (--forLevel < 0) {
                    276:                Parse_Error (level, "for-less endfor");
                    277:                return 0;
                    278:            }
                    279:        }
1.2       jtc       280:        else if (strncmp(ptr, "for", 3) == 0 &&
                    281:                 isspace((unsigned char) ptr[3])) {
1.1       cgd       282:            forLevel++;
                    283:            if (DEBUG(FOR))
                    284:                (void) fprintf(stderr, "For: new loop %d\n", forLevel);
                    285:        }
                    286:     }
                    287:
                    288:     if (forLevel != 0) {
1.7       christos  289:        Buf_AddBytes(accumFor.buf, strlen(line), (Byte *) line);
                    290:        Buf_AddByte(accumFor.buf, (Byte) '\n');
1.1       cgd       291:        return 1;
                    292:     }
                    293:     else {
                    294:        return 0;
                    295:     }
                    296: }
                    297:
                    298: 
                    299: /*-
                    300:  *-----------------------------------------------------------------------
                    301:  * For_Run --
1.7       christos  302:  *     Run the for loop, imitating the actions of an include file
1.1       cgd       303:  *
                    304:  * Results:
                    305:  *     None.
                    306:  *
                    307:  * Side Effects:
                    308:  *     None.
                    309:  *
                    310:  *-----------------------------------------------------------------------
                    311:  */
                    312: void
1.13    ! wiz       313: For_Run(void)
1.1       cgd       314: {
1.2       jtc       315:     For arg;
1.7       christos  316:     LstNode ln;
                    317:     char **values;
                    318:     int i, done = 0, len;
1.10      mycroft   319:     char *guy, *orig_guy, *old_guy;
1.7       christos  320:
                    321:     if (accumFor.buf == NULL || accumFor.vars == NULL || accumFor.lst == NULL)
                    322:        return;
                    323:     arg = accumFor;
                    324:     accumFor.buf = NULL;
                    325:     accumFor.vars = NULL;
                    326:     accumFor.nvars = 0;
                    327:     accumFor.lst = NULL;
1.1       cgd       328:
1.7       christos  329:     if (Lst_Open(arg.lst) != SUCCESS)
1.1       cgd       330:        return;
                    331:
1.7       christos  332:     values = emalloc(arg.nvars * sizeof(char *));
                    333:
                    334:     while (!done) {
                    335:        /*
                    336:         * due to the dumb way this is set up, this loop must run
                    337:         * backwards.
                    338:         */
                    339:        for (i = arg.nvars - 1; i >= 0; i--) {
                    340:            ln = Lst_Next(arg.lst);
                    341:            if (ln == NILLNODE) {
                    342:                if (i != arg.nvars-1) {
                    343:                    Parse_Error(PARSE_FATAL,
                    344:                        "Not enough words in for substitution list");
                    345:                }
                    346:                done = 1;
                    347:                break;
                    348:            } else {
                    349:                values[i] = (char *) Lst_Datum(ln);
                    350:            }
                    351:        }
                    352:        if (done)
                    353:            break;
                    354:
                    355:        for (i = 0; i < arg.nvars; i++) {
1.11      sjg       356:            Var_Set(arg.vars[i], values[i], VAR_GLOBAL, 0);
1.7       christos  357:            if (DEBUG(FOR))
                    358:                (void) fprintf(stderr, "--- %s = %s\n", arg.vars[i],
                    359:                    values[i]);
                    360:        }
                    361:
                    362:        /*
                    363:         * Hack, hack, kludge.
                    364:         * This is really ugly, but to do it any better way would require
                    365:         * making major changes to var.c, which I don't want to get into
                    366:         * yet. There is no mechanism for expanding some variables, only
                    367:         * for expanding a single variable. That should be corrected, but
                    368:         * not right away. (XXX)
                    369:         */
                    370:
                    371:        guy = (char *) Buf_GetAll(arg.buf, &len);
1.10      mycroft   372:        orig_guy = guy;
                    373:        for (i = 0; i < arg.nvars; i++) {
                    374:            old_guy = guy;
                    375:            guy = Var_Subst(arg.vars[i], guy, VAR_GLOBAL, FALSE);
                    376:            if (old_guy != orig_guy)
                    377:                free(old_guy);
                    378:        }
1.7       christos  379:        Parse_FromString(guy);
                    380:
                    381:        for (i = 0; i < arg.nvars; i++)
1.10      mycroft   382:            Var_Delete(arg.vars[i], VAR_GLOBAL);
1.7       christos  383:     }
                    384:
                    385:     free(values);
                    386:
                    387:     Lst_Close(arg.lst);
                    388:
                    389:     for (i=0; i<arg.nvars; i++) {
                    390:        free(arg.vars[i]);
                    391:     }
                    392:     free(arg.vars);
1.1       cgd       393:
1.13    ! wiz       394:     Lst_Destroy(arg.lst, (void (*)(ClientData)) free);
1.1       cgd       395:     Buf_Destroy(arg.buf, TRUE);
                    396: }

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