usr/src/contrib/sort/sort.c

/*-
 * Copyright (c) 1993 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Peter McIlroy.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1993 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)sort.c      5.1 (Berkeley) %G%";
#endif /* not lint */

/* Sort sorts a file using an optional user-defined key.
 * Sort uses radix sort for internal sorting, and allows
 * a choice of merge sort and radix sort for external sorting.
 */

#include "sort.h"
#include "fsort.h"
#include "pathnames.h"

#include <paths.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int REC_D = '\n';
u_char d_mask[NBINS];           /* flags for rec_d, field_d, <blank> */
/*
 * weight tables.  Gweights is one of ascii, Rascii..
 * modified to weight rec_d = 0 (or 255)
 */
extern u_char gweights[NBINS];
u_char ascii[NBINS], Rascii[NBINS], RFtable[NBINS], Ftable[NBINS];
/*
 * masks of ignored characters.  Alltable is 256 ones
 */
u_char dtable[NBINS], itable[NBINS], alltable[NBINS];
int SINGL_FLD = 0, SEP_FLAG = 0, UNIQUE = 0;
struct coldesc clist[(ND+1)*2];
int ncols = 0;
extern struct coldesc clist[(ND+1)*2];
extern int ncols;

char devstdin[] = _PATH_STDIN;
char toutpath[_POSIX_PATH_MAX];

static void cleanup __P((void));
static void onsig __P((int));
static void usage __P((char *));

int
main(argc, argv)
        int argc;
        char *argv[];
{
        extern int optind;
        extern char *optarg;
        int (*get)();
        int ch, i, stdinflag = 0, tmp = 0;
        char cflag = 0, mflag = 0, nflag = 0;
        char *outfile, *outpath = 0;
        struct field fldtab[ND+2], *ftpos;
        union f_handle filelist;
        FILE *outfd;
        memset(fldtab, 0, (ND+2)*sizeof(struct field));
        memset(d_mask, 0, NBINS);
        d_mask[REC_D = '\n'] = REC_D_F;
        SINGL_FLD = SEP_FLAG = 0;
        d_mask['\t'] = d_mask[' '] = BLANK | FLD_D;
        ftpos = fldtab;
        fixit(&argc, argv);
        while ((ch = getopt(argc, argv, "bcdfik:mHno:rt:T:ux")) != EOF) {
        switch (ch) {
                case 'b': fldtab->flags |= BI | BT;
                        break;
                case 'd':
                case 'i':
                case 'f':
                case 'r': tmp |= optval(ch, 0);
                        if (tmp & R && tmp & F)
                                fldtab->weights = RFtable;
                        else if (tmp & F)
                                fldtab->weights = Ftable;
                        else if(tmp & R)
                                fldtab->weights = Rascii;
                        fldtab->flags |= tmp;
                        break;
                case 'o':
                        outpath = optarg;
                        break;
                case 'n':
                        nflag = 1;
                        setfield("1n", ++ftpos, fldtab->flags&(~R));
                        break;
                case 'k':
                         setfield(optarg, ++ftpos, fldtab->flags);
                        break;
                case 't':
                        if (SEP_FLAG)
                                usage("multiple field delimiters");
                        SEP_FLAG = 1;
                        d_mask[' '] &= ~FLD_D;
                        d_mask['\t'] &= ~FLD_D;
                        d_mask[*optarg] |= FLD_D;
                        if (d_mask[*optarg] & REC_D_F)
                                err(2, "record/field delimiter clash");
                        break;
                case 'T':
                        if (REC_D != '\n')
                                usage("multiple record delimiters");
                        if ('\n' == (REC_D = *optarg))
                                break;
                        d_mask['\n'] = d_mask[' '];
                        d_mask[REC_D] = REC_D_F;
                        break;
                case 'u':
                        UNIQUE = 1;
                        break;
                case 'c':
                        cflag = 1;
                        break;
                case 'm':
                        mflag = 1;
                        break;
                case 'H':
                        PANIC = 0;
                        break;
                case '?':
                default: usage("");
                }
        }
        if (cflag && argc > optind+1)
                errx(2, "too many input files for -c option");
        if (argc - 2 > optind && !strcmp(argv[argc-2], "-o")) {
                outpath = argv[argc-1];
                argc -= 2;
        }
        if (mflag && argc - optind > (MAXFCT - (16+1))*16)
                errx(2, "too many input files for -m option");
        for (i = optind; i < argc; i++) {
                /* allow one occurrence of /dev/stdin */
                if (!strcmp(argv[i], "-") || !strcmp(argv[i], devstdin)) {
                        if (stdinflag)
                                warnx("ignoring extra \"%s\" in file list",
                                    argv[i]);
                        else {
                                stdinflag = 1;
                                argv[i] = devstdin;
                        }
                } else if (ch = access(argv[i], R_OK))
                        err(2, "%s", argv[i]);
        }
        if (!(fldtab->flags & (I|D) || fldtab[1].icol.num)) {
                SINGL_FLD = 1;
                fldtab[0].icol.num = 1;
        } else {
                if (!fldtab[1].icol.num) {
                        fldtab[0].flags &= ~(BI|BT);
                        setfield("1", ++ftpos, fldtab->flags);
                }
                if (nflag)
                        fldtab[1].flags |= fldtab->flags;
                fldreset(fldtab);
                fldtab[0].flags &= ~F;
        }
        settables(fldtab[0].flags);
        num_init();
        fldtab->weights = gweights;
        if (optind == argc)
                argv[--optind] = devstdin;
        filelist.names = argv+optind;
        if (SINGL_FLD)
                get = makeline;
        else
                get = makekey;
        if (cflag) {
                order(filelist, get, fldtab);
                /* NOT REACHED */
        }
        if (!outpath) {
                (void)snprintf(toutpath,
                    sizeof(toutpath), "%sstdout", _PATH_DEV);
                outfile = outpath = toutpath;
        } else if (!(ch = access(outpath, 0)) &&
            strncmp(_PATH_DEV, outpath, 5)) {
                struct sigaction act = {0, SIG_BLOCK, 6};
                int sigtable[] = {SIGHUP, SIGINT, SIGPIPE, SIGXCPU, SIGXFSZ,
                    SIGVTALRM, SIGPROF, 0};
                errno = 0;
                if (access(outpath, W_OK))
                        err(2, "%s", outpath);
                act.sa_handler = cleanup;
                (void)snprintf(toutpath, sizeof(toutpath), "%sXXXX", outpath);
                outfile = mktemp(toutpath);
                if (!outfile)
                        err(2, "%s", toutpath);
                (void)atexit(cleanup);
                for (i = 0; sigtable[i]; ++i)   /* always unlink toutpath */
                        sigaction(sigtable[i], &act, 0);
        } else outfile = outpath;
        if (!(outfd = fopen(outfile, "w")))
                err(2, "%s", outfile);
        if (mflag)
                fmerge(-1, filelist, argc-optind, get, outfd, putline, fldtab);
        else
                fsort(-1, 0, filelist, argc-optind, outfd, fldtab);
        if (outfile != outpath) {
                if (access(outfile, 0))
                        err(2, "%s", outfile);
                (void)unlink(outpath);
                if (link(outfile, outpath))
                        err(2, "cannot link %s: output left in %s",
                            outpath, outfile);
                (void)unlink(outfile);
        }
        exit(0);
}

static void
onsig(s)
        int s;
{
        cleanup();
        exit(2);                        /* return 2 on error/interrupt */
}

static void
cleanup()
{
        if (toutpath[0])
                (void)unlink(toutpath);
}

static void
usage(msg)
        char *msg;
{
        if (msg)
                (void)fprintf(stderr, "sort: %s\n", msg);
        (void)fprintf(stderr, "usage: [-o output] [-cmubdfinr] [-t char] ");
        (void)fprintf(stderr, "[-T char] [-k keydef] ... [files]\n");
        exit(2);
}