cmd/refer/hunt7.c

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <stdio.h>
#include <locale.h>
#include <assert.h>
#define SAME 0
#define FGCT 10
#define FGSIZE 150

int keepold = 1;    /* keep old things for fgrep search */
char fgspace[FGSIZE];
char *fgp = fgspace;
char *fgnames[FGCT];
char **fgnamp = fgnames;

extern char *mindex();

long
findline(char *in, char **out, int outlen, long indexdate)
{
    static char name[100] = "";
    char *p, **ftp;
    extern long gdate();
    static FILE *fa = NULL;
    long lp, llen;
    int len, k, nofil;

#if D1
    fprintf(stderr, "findline: %s\n", in);
#endif
    if (mindex(in, '!'))
        return (0);

    nofil = in[0] == 0;
    for (p = in; *p && *p != ':' && *p != ';'; p++)
        ;
    if (*p) *p++ = 0;
    else p = in;
    k = sscanf(p, "%ld,%ld", &lp, &llen);
#ifdef D1
    fprintf(stderr, "p %s k %d lp %ld llen %ld\n", p, k, lp, llen);
#endif
    if (k < 2) {
        lp = 0;
        llen = outlen;
    }
#ifdef D1
    fprintf(stderr, "lp %ld llen %ld\n", lp, llen);
#endif
#ifdef D1
    fprintf(stderr, "fa now %o, p %o in %o %s\n", fa, p, in, in);
#endif
    if (nofil) {
#if D1
        fprintf(stderr, "set fa to stdin\n");
#endif
        fa = stdin;
    } else
        if (strcmp(name, in) != 0 || 1) {
#if D1
            fprintf(stderr, "old: %s new %s not equal\n", name, in);
#endif
            if (fa != NULL)
                fa = freopen(in, "r", fa);
            else
                fa = fopen(in, "r");
#if D1
            if (fa == NULL)
                fprintf(stderr, "failed to (re)open *%s*\n",
                    in);
#endif
            if (fa == NULL)
                return (0);
            /* err("Can't open %s", in); */
            strcpy(name, in);
            if (gdate(fa) > indexdate && indexdate != 0) {
                if (keepold) {
                    for (ftp = fgnames; ftp < fgnamp; ftp++)
                        if (strcmp(*ftp, name) == SAME)
                            return (0);
                    strcpy(*fgnamp++ = fgp, name);
                    assert(fgnamp < fgnames+FGCT);
                    while (*fgp && *fgp != ':')
                        fgp++;
                    *fgp++ = 0;
                    assert(fgp < fgspace+FGSIZE);
                    return (0);
                }
                fprintf(stderr, gettext(
                    "Warning: index predates file '%s'\n"),
                    name);
            }
        }
#if D1
        else
            fprintf(stderr, "old %s new %s same fa %o\n",
                name, in, fa);
#endif
    if (fa != NULL) {
        fseek(fa, lp, 0);
        *out = (char *)malloc(llen + 1);
        if (*out == NULL) {
            return (0);
        }
        len = fread(*out, 1, llen, fa);
        *(*out + llen) = 0;
#ifdef D1
        fprintf(stderr, "length as read is %d\n", len);
#endif
    }
    return (llen);
}