isblank() implementation.

[minix.git] / commands / make / compat.c

/*      $NetBSD: compat.c,v 1.76 2009/02/22 07:33:00 dholland Exp $     */

/*
 * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * 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. 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.
 */

/*
 * Copyright (c) 1988, 1989 by Adam de Boor
 * Copyright (c) 1989 by Berkeley Softworks
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Adam de Boor.
 *
 * 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.
 */

#ifndef MAKE_NATIVE
static char rcsid[] = "$NetBSD: compat.c,v 1.76 2009/02/22 07:33:00 dholland Exp $";
#else
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)compat.c    8.2 (Berkeley) 3/19/94";
#else
__RCSID("$NetBSD: compat.c,v 1.76 2009/02/22 07:33:00 dholland Exp $");
#endif
#endif /* not lint */
#endif

/*-
 * compat.c --
 *      The routines in this file implement the full-compatibility
 *      mode of PMake. Most of the special functionality of PMake
 *      is available in this mode. Things not supported:
 *          - different shells.
 *          - friendly variable substitution.
 *
 * Interface:
 *      Compat_Run          Initialize things for this module and recreate
 *                          thems as need creatin'
 */

#include    <sys/types.h>
#include    <sys/stat.h>
#include    <sys/wait.h>

#include    <ctype.h>
#include    <errno.h>
#include    <signal.h>
#include    <stdio.h>

#include    "make.h"
#include    "hash.h"
#include    "dir.h"
#include    "job.h"
#include    "pathnames.h"

/*
 * The following array is used to make a fast determination of which
 * characters are interpreted specially by the shell.  If a command
 * contains any of these characters, it is executed by the shell, not
 * directly by us.
 */

static char         meta[256];

static GNode        *curTarg = NULL;
static GNode        *ENDNode;
static void CompatInterrupt(int);

static void
Compat_Init(void)
{
    const char *cp;

    Shell_Init();               /* setup default shell */
    
    for (cp = "#=|^(){};&<>*?[]:$`\\\n"; *cp != '\0'; cp++) {
        meta[(unsigned char) *cp] = 1;
    }
    /*
     * The null character serves as a sentinel in the string.
     */
    meta[0] = 1;
}

/*-
 *-----------------------------------------------------------------------
 * CompatInterrupt --
 *      Interrupt the creation of the current target and remove it if
 *      it ain't precious.
 *
 * Results:
 *      None.
 *
 * Side Effects:
 *      The target is removed and the process exits. If .INTERRUPT exists,
 *      its commands are run first WITH INTERRUPTS IGNORED..
 *
 *-----------------------------------------------------------------------
 */
static void
CompatInterrupt(int signo)
{
    GNode   *gn;

    if ((curTarg != NULL) && !Targ_Precious (curTarg)) {
        char      *p1;
        char      *file = Var_Value(TARGET, curTarg, &p1);

        if (!noExecute && eunlink(file) != -1) {
            Error("*** %s removed", file);
        }
        if (p1)
            free(p1);

        /*
         * Run .INTERRUPT only if hit with interrupt signal
         */
        if (signo == SIGINT) {
            gn = Targ_FindNode(".INTERRUPT", TARG_NOCREATE);
            if (gn != NULL) {
                Compat_Make(gn, gn);
            }
        }

    }
    exit(signo);
}
\f
/*-
 *-----------------------------------------------------------------------
 * CompatRunCommand --
 *      Execute the next command for a target. If the command returns an
 *      error, the node's made field is set to ERROR and creation stops.
 *
 * Input:
 *      cmdp            Command to execute
 *      gnp             Node from which the command came
 *
 * Results:
 *      0 if the command succeeded, 1 if an error occurred.
 *
 * Side Effects:
 *      The node's 'made' field may be set to ERROR.
 *
 *-----------------------------------------------------------------------
 */
int
CompatRunCommand(void *cmdp, void *gnp)
{
    char          *cmdStart;    /* Start of expanded command */
    char          *cp, *bp;
    Boolean       silent,       /* Don't print command */
                  doIt;         /* Execute even if -n */
    volatile Boolean errCheck;  /* Check errors */
    int           reason;       /* Reason for child's death */
    int           status;       /* Description of child's death */
    pid_t         cpid;         /* Child actually found */
    pid_t         retstat;      /* Result of wait */
    LstNode       cmdNode;      /* Node where current command is located */
    const char  ** volatile av; /* Argument vector for thing to exec */
    char        ** volatile mav;/* Copy of the argument vector for freeing */
    int           argc;         /* Number of arguments in av or 0 if not
                                 * dynamically allocated */
    Boolean       local;        /* TRUE if command should be executed
                                 * locally */
    Boolean       useShell;     /* TRUE if command should be executed
                                 * using a shell */
    char          * volatile cmd = (char *)cmdp;
    GNode         *gn = (GNode *)gnp;

    silent = gn->type & OP_SILENT;
    errCheck = !(gn->type & OP_IGNORE);
    doIt = FALSE;
    
    cmdNode = Lst_Member(gn->commands, cmd);
    cmdStart = Var_Subst(NULL, cmd, gn, FALSE);

    /*
     * brk_string will return an argv with a NULL in av[0], thus causing
     * execvp to choke and die horribly. Besides, how can we execute a null
     * command? In any case, we warn the user that the command expanded to
     * nothing (is this the right thing to do?).
     */

    if (*cmdStart == '\0') {
        free(cmdStart);
        Error("%s expands to empty string", cmd);
        return(0);
    }
    cmd = cmdStart;
    Lst_Replace(cmdNode, cmdStart);

    if ((gn->type & OP_SAVE_CMDS) && (gn != ENDNode)) {
        (void)Lst_AtEnd(ENDNode->commands, cmdStart);
        return(0);
    }
    if (strcmp(cmdStart, "...") == 0) {
        gn->type |= OP_SAVE_CMDS;
        return(0);
    }

    while ((*cmd == '@') || (*cmd == '-') || (*cmd == '+')) {
        switch (*cmd) {
        case '@':
            silent = DEBUG(LOUD) ? FALSE : TRUE;
            break;
        case '-':
            errCheck = FALSE;
            break;
        case '+':
            doIt = TRUE;
            if (!meta[0])               /* we came here from jobs */
                Compat_Init();
            break;
        }
        cmd++;
    }

    while (isspace((unsigned char)*cmd))
        cmd++;

#if !defined(MAKE_NATIVE)
    /*
     * In a non-native build, the host environment might be weird enough
     * that it's necessary to go through a shell to get the correct
     * behaviour.  Or perhaps the shell has been replaced with something
     * that does extra logging, and that should not be bypassed.
     */
    useShell = TRUE;
#else
    /*
     * Search for meta characters in the command. If there are no meta
     * characters, there's no need to execute a shell to execute the
     * command.
     */
    for (cp = cmd; !meta[(unsigned char)*cp]; cp++) {
        continue;
    }
    useShell = (*cp != '\0');
#endif

    /*
     * Print the command before echoing if we're not supposed to be quiet for
     * this one. We also print the command if -n given.
     */
    if (!silent || NoExecute(gn)) {
        printf("%s\n", cmd);
        fflush(stdout);
    }

    /*
     * If we're not supposed to execute any commands, this is as far as
     * we go...
     */
    if (!doIt && NoExecute(gn)) {
        return (0);
    }
    if (DEBUG(JOB))
        fprintf(debug_file, "Execute: '%s'\n", cmd);

again:
    if (useShell) {
        /*
         * We need to pass the command off to the shell, typically
         * because the command contains a "meta" character.
         */
        static const char *shargv[4];

        shargv[0] = shellPath;
        /*
         * The following work for any of the builtin shell specs.
         */
        if (DEBUG(SHELL))
                shargv[1] = "-xc";
        else
                shargv[1] = "-c";
        shargv[2] = cmd;
        shargv[3] = NULL;
        av = shargv;
        argc = 0;
        bp = NULL;
        mav = NULL;
    } else {
        /*
         * No meta-characters, so no need to exec a shell. Break the command
         * into words to form an argument vector we can execute.
         */
        mav = brk_string(cmd, &argc, TRUE, &bp);
        if (mav == NULL) {
                useShell = 1;
                goto again;
        }
        av = (const char **)mav;
    }

    local = TRUE;

    /*
     * Fork and execute the single command. If the fork fails, we abort.
     */
#if defined(__minix)
    cpid = fork();
#else
    cpid = vfork();
#endif
    if (cpid < 0) {
        Fatal("Could not fork");
    }
    if (cpid == 0) {
        Check_Cwd(av);
        Var_ExportVars();
        if (local)
            (void)execvp(av[0], (char *const *)UNCONST(av));
        else
            (void)execv(av[0], (char *const *)UNCONST(av));
        execError("exec", av[0]);
        _exit(1);
    }
    if (mav)
        free(mav);
    if (bp)
        free(bp);
    Lst_Replace(cmdNode, NULL);

    /*
     * The child is off and running. Now all we can do is wait...
     */
    while (1) {

        while ((retstat = wait(&reason)) != cpid) {
            if (retstat == -1 && errno != EINTR) {
                break;
            }
        }

        if (retstat > -1) {
            if (WIFSTOPPED(reason)) {
                status = WSTOPSIG(reason);              /* stopped */
            } else if (WIFEXITED(reason)) {
                status = WEXITSTATUS(reason);           /* exited */
                if (status != 0) {
                    if (DEBUG(ERROR)) {
                        fprintf(debug_file, "\n*** Failed target:  %s\n*** Failed command: ",
                            gn->name);
                        for (cp = cmd; *cp; ) {
                            if (isspace((unsigned char)*cp)) {
                                fprintf(debug_file, " ");
                                while (isspace((unsigned char)*cp))
                                    cp++;
                            } else {
                                fprintf(debug_file, "%c", *cp);
                                cp++;
                            }
                        }
                        fprintf(debug_file, "\n");
                    }
                    fprintf(debug_file, "*** Error code %d", status);
                }
            } else {
                status = WTERMSIG(reason);              /* signaled */
                printf("*** Signal %d", status);
            }


            if (!WIFEXITED(reason) || (status != 0)) {
                if (errCheck) {
                    gn->made = ERROR;
                    if (keepgoing) {
                        /*
                         * Abort the current target, but let others
                         * continue.
                         */
                        printf(" (continuing)\n");
                    }
                } else {
                    /*
                     * Continue executing commands for this target.
                     * If we return 0, this will happen...
                     */
                    printf(" (ignored)\n");
                    status = 0;
                }
            }
            break;
        } else {
            Fatal("error in wait: %d: %s", retstat, strerror(errno));
            /*NOTREACHED*/
        }
    }
    free(cmdStart);

    return (status);
}
\f
/*-
 *-----------------------------------------------------------------------
 * Compat_Make --
 *      Make a target.
 *
 * Input:
 *      gnp             The node to make
 *      pgnp            Parent to abort if necessary
 *
 * Results:
 *      0
 *
 * Side Effects:
 *      If an error is detected and not being ignored, the process exits.
 *
 *-----------------------------------------------------------------------
 */
int
Compat_Make(void *gnp, void *pgnp)
{
    GNode *gn = (GNode *)gnp;
    GNode *pgn = (GNode *)pgnp;

    if (!meta[0])               /* we came here from jobs */
        Compat_Init();
    if (gn->made == UNMADE && (gn == pgn || (pgn->type & OP_MADE) == 0)) {
        /*
         * First mark ourselves to be made, then apply whatever transformations
         * the suffix module thinks are necessary. Once that's done, we can
         * descend and make all our children. If any of them has an error
         * but the -k flag was given, our 'make' field will be set FALSE again.
         * This is our signal to not attempt to do anything but abort our
         * parent as well.
         */
        gn->flags |= REMAKE;
        gn->made = BEINGMADE;
        if ((gn->type & OP_MADE) == 0)
            Suff_FindDeps(gn);
        Lst_ForEach(gn->children, Compat_Make, gn);
        if ((gn->flags & REMAKE) == 0) {
            gn->made = ABORTED;
            pgn->flags &= ~REMAKE;
            goto cohorts;
        }

        if (Lst_Member(gn->iParents, pgn) != NULL) {
            char *p1;
            Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn, 0);
            if (p1)
                free(p1);
        }

        /*
         * All the children were made ok. Now cmtime contains the modification
         * time of the newest child, we need to find out if we exist and when
         * we were modified last. The criteria for datedness are defined by the
         * Make_OODate function.
         */
        if (DEBUG(MAKE)) {
            fprintf(debug_file, "Examining %s...", gn->name);
        }
        if (! Make_OODate(gn)) {
            gn->made = UPTODATE;
            if (DEBUG(MAKE)) {
                fprintf(debug_file, "up-to-date.\n");
            }
            goto cohorts;
        } else if (DEBUG(MAKE)) {
            fprintf(debug_file, "out-of-date.\n");
        }

        /*
         * If the user is just seeing if something is out-of-date, exit now
         * to tell him/her "yes".
         */
        if (queryFlag) {
            exit(1);
        }

        /*
         * We need to be re-made. We also have to make sure we've got a $?
         * variable. To be nice, we also define the $> variable using
         * Make_DoAllVar().
         */
        Make_DoAllVar(gn);

        /*
         * Alter our type to tell if errors should be ignored or things
         * should not be printed so CompatRunCommand knows what to do.
         */
        if (Targ_Ignore(gn)) {
            gn->type |= OP_IGNORE;
        }
        if (Targ_Silent(gn)) {
            gn->type |= OP_SILENT;
        }

        if (Job_CheckCommands(gn, Fatal)) {
            /*
             * Our commands are ok, but we still have to worry about the -t
             * flag...
             */
            if (!touchFlag || (gn->type & OP_MAKE)) {
                curTarg = gn;
                Lst_ForEach(gn->commands, CompatRunCommand, gn);
                curTarg = NULL;
            } else {
                Job_Touch(gn, gn->type & OP_SILENT);
            }
        } else {
            gn->made = ERROR;
        }

        if (gn->made != ERROR) {
            /*
             * If the node was made successfully, mark it so, update
             * its modification time and timestamp all its parents. Note
             * that for .ZEROTIME targets, the timestamping isn't done.
             * This is to keep its state from affecting that of its parent.
             */
            gn->made = MADE;
            pgn->flags |= Make_Recheck(gn) == 0 ? FORCE : 0;
            if (!(gn->type & OP_EXEC)) {
                pgn->flags |= CHILDMADE;
                Make_TimeStamp(pgn, gn);
            }
        } else if (keepgoing) {
            pgn->flags &= ~REMAKE;
        } else {
            PrintOnError("\n\nStop.");
            exit(1);
        }
    } else if (gn->made == ERROR) {
        /*
         * Already had an error when making this beastie. Tell the parent
         * to abort.
         */
        pgn->flags &= ~REMAKE;
    } else {
        if (Lst_Member(gn->iParents, pgn) != NULL) {
            char *p1;
            Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn, 0);
            if (p1)
                free(p1);
        }
        switch(gn->made) {
            case BEINGMADE:
                Error("Graph cycles through %s", gn->name);
                gn->made = ERROR;
                pgn->flags &= ~REMAKE;
                break;
            case MADE:
                if ((gn->type & OP_EXEC) == 0) {
                    pgn->flags |= CHILDMADE;
                    Make_TimeStamp(pgn, gn);
                }
                break;
            case UPTODATE:
                if ((gn->type & OP_EXEC) == 0) {
                    Make_TimeStamp(pgn, gn);
                }
                break;
            default:
                break;
        }
    }

cohorts:
    Lst_ForEach(gn->cohorts, Compat_Make, pgnp);
    return (0);
}
\f
/*-
 *-----------------------------------------------------------------------
 * Compat_Run --
 *      Initialize this mode and start making.
 *
 * Input:
 *      targs           List of target nodes to re-create
 *
 * Results:
 *      None.
 *
 * Side Effects:
 *      Guess what?
 *
 *-----------------------------------------------------------------------
 */
void
Compat_Run(Lst targs)
{
    GNode         *gn = NULL;/* Current root target */
    int           errors;   /* Number of targets not remade due to errors */

    Compat_Init();

    if (signal(SIGINT, SIG_IGN) != SIG_IGN) {
        signal(SIGINT, CompatInterrupt);
    }
    if (signal(SIGTERM, SIG_IGN) != SIG_IGN) {
        signal(SIGTERM, CompatInterrupt);
    }
    if (signal(SIGHUP, SIG_IGN) != SIG_IGN) {
        signal(SIGHUP, CompatInterrupt);
    }
    if (signal(SIGQUIT, SIG_IGN) != SIG_IGN) {
        signal(SIGQUIT, CompatInterrupt);
    }

    ENDNode = Targ_FindNode(".END", TARG_CREATE);
    ENDNode->type = OP_SPECIAL;
    /*
     * If the user has defined a .BEGIN target, execute the commands attached
     * to it.
     */
    if (!queryFlag) {
        gn = Targ_FindNode(".BEGIN", TARG_NOCREATE);
        if (gn != NULL) {
            Compat_Make(gn, gn);
            if (gn->made == ERROR) {
                PrintOnError("\n\nStop.");
                exit(1);
            }
        }
    }

    /*
     * Expand .USE nodes right now, because they can modify the structure
     * of the tree.
     */
    Make_ExpandUse(targs);

    /*
     * For each entry in the list of targets to create, call Compat_Make on
     * it to create the thing. Compat_Make will leave the 'made' field of gn
     * in one of several states:
     *      UPTODATE        gn was already up-to-date
     *      MADE            gn was recreated successfully
     *      ERROR           An error occurred while gn was being created
     *      ABORTED         gn was not remade because one of its inferiors
     *                      could not be made due to errors.
     */
    errors = 0;
    while (!Lst_IsEmpty (targs)) {
        gn = (GNode *)Lst_DeQueue(targs);
        Compat_Make(gn, gn);

        if (gn->made == UPTODATE) {
            printf("`%s' is up to date.\n", gn->name);
        } else if (gn->made == ABORTED) {
            printf("`%s' not remade because of errors.\n", gn->name);
            errors += 1;
        }
    }

    /*
     * If the user has defined a .END target, run its commands.
     */
    if (errors == 0) {
        Compat_Make(ENDNode, ENDNode);
        if (gn->made == ERROR) {
            PrintOnError("\n\nStop.");
            exit(1);
        }
    }
}