/*      $OpenBSD: ctags.c,v 1.19 2022/12/04 23:50:47 cheloha Exp $      */
/*      $NetBSD: ctags.c,v 1.4 1995/09/02 05:57:23 jtc Exp $    */

/*
 * Copyright (c) 1987, 1993, 1994, 1995
 *      The Regents of the University of California.  All rights reserved.
 *
 * 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.
 */

#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>

#include "ctags.h"

/*
 * ctags: create a tags file
 */

NODE    *head;                  /* head of the sorted binary tree */

                                /* boolean "func" (see init()) */
bool    _wht[256], _itk[256], _btk[256];

FILE    *inf;                   /* ioptr for current input file */
FILE    *outf;                  /* ioptr for tags file */

long    lineftell;              /* ftell after getc( inf ) == '\n' */

int     lineno;                 /* line number of current line */
int     dflag;                  /* -d: non-macro defines */
int     vflag;                  /* -v: vgrind style index output */
int     wflag;                  /* -w: suppress warnings */
int     xflag;                  /* -x: cxref style output */

char    *curfile;               /* current input file name */
char    searchar = '/';         /* use /.../ searches by default */
char    lbuf[LINE_MAX];

void    init(void);
void    find_entries(char *);
void    preload_entries(char *, int, char *[]);

int
main(int argc, char *argv[])
{
        static char     *outfile = "tags";      /* output file */
        int     aflag;                          /* -a: append to tags */
        int     uflag;                          /* -u: update tags */
        int     exit_val;                       /* exit value */
        int     step;                           /* step through args */
        int     ch;                             /* getopts char */

        if (pledge("stdio rpath wpath cpath", NULL) == -1)
                err(1, "pledge");

        aflag = uflag = NO;
        while ((ch = getopt(argc, argv, "BFadf:tuwvx")) != -1)
                switch(ch) {
                case 'B':
                        searchar = '?';
                        break;
                case 'F':
                        searchar = '/';
                        break;
                case 'a':
                        aflag = 1;
                        break;
                case 'd':
                        dflag = 1;
                        break;
                case 'f':
                        outfile = optarg;
                        break;
                case 't':
                        /* backwards compatibility */
                        break;
                case 'u':
                        uflag = 1;
                        break;
                case 'w':
                        wflag = 1;
                        break;
                case 'v':
                        vflag = 1;
                case 'x':
                        xflag = 1;
                        break;
                default:
                        goto usage;
                }
        argv += optind;
        argc -= optind;
        if (!argc) {
usage:          (void)fprintf(stderr,
                        "usage: ctags [-aBdFuvwx] [-f tagsfile] file ...\n");
                exit(1);
        }

        init();
        if (uflag && !vflag && !xflag)
                preload_entries(outfile, argc, argv);

        for (exit_val = step = 0; step < argc; ++step)
                if (!(inf = fopen(argv[step], "r"))) {
                        warn("%s", argv[step]);
                        exit_val = 1;
                }
                else {
                        curfile = argv[step];
                        find_entries(argv[step]);
                        (void)fclose(inf);
                }

        if (head) {
                if (xflag)
                        put_entries(head);
                else {
                        if (!(outf = fopen(outfile, aflag ? "a" : "w")))
                                err(exit_val, "%s", outfile);
                        put_entries(head);
                        (void)fclose(outf);
                }
        }
        exit(exit_val);
}

/*
 * init --
 *      this routine sets up the boolean psuedo-functions which work by
 *      setting boolean flags dependent upon the corresponding character.
 *      Every char which is NOT in that string is false with respect to
 *      the pseudo-function.  Therefore, all of the array "_wht" is NO
 *      by default and then the elements subscripted by the chars in
 *      CWHITE are set to YES.  Thus, "_wht" of a char is YES if it is in
 *      the string CWHITE, else NO.
 */
void
init(void)
{
        int             i;
        unsigned char   *sp;

        for (i = 0; i < 256; i++)
                _wht[i] = _itk[i] = _btk[i] = NO;
#define CWHITE  " \f\t\n"
        for (sp = CWHITE; *sp; sp++)    /* white space chars */
                _wht[*sp] = YES;
#define CINTOK  "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz0123456789"
        for (sp = CINTOK; *sp; sp++)    /* valid in-token chars */
                _itk[*sp] = YES;
#define CBEGIN  "ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz"
        for (sp = CBEGIN; *sp; sp++)    /* token starting chars */
                _btk[*sp] = YES;
}

/*
 * find_entries --
 *      this routine opens the specified file and calls the function
 *      which searches the file.
 */
void
find_entries(char *file)
{
        char    *cp;

        lineno = 0;                             /* should be 1 ?? KB */
        if ((cp = strrchr(file, '.'))) {
                if (cp[1] == 'l' && !cp[2]) {
                        int     c;

                        for (;;) {
                                if (GETC(==, EOF))
                                        return;
                                if (!iswhite(c)) {
                                        rewind(inf);
                                        break;
                                }
                        }
#define LISPCHR ";(["
/* lisp */              if (strchr(LISPCHR, c)) {
                                l_entries();
                                return;
                        }
/* lex */               else {
                                /*
                                 * we search all 3 parts of a lex file
                                 * for C references.  This may be wrong.
                                 */
                                toss_yysec();
                                (void)strlcpy(lbuf, "%%$", sizeof lbuf);
                                pfnote("yylex", lineno);
                                rewind(inf);
                        }
                }
/* yacc */      else if (cp[1] == 'y' && !cp[2]) {
                        /*
                         * we search only the 3rd part of a yacc file
                         * for C references.  This may be wrong.
                         */
                        toss_yysec();
                        (void)strlcpy(lbuf, "%%$", sizeof lbuf);
                        pfnote("yyparse", lineno);
                        y_entries();
                }
/* fortran */   else if ((cp[1] != 'c' && cp[1] != 'h') && !cp[2]) {
                        if (PF_funcs())
                                return;
                        rewind(inf);
                }
        }
/* C */ c_entries();
}

void
preload_entries(char *tagsfile, int argc, char *argv[])
{
        FILE    *fp;
        char     line[LINE_MAX];
        char    *entry = NULL;
        char    *file = NULL;
        char    *pattern = NULL;
        char    *eol;
        int      i;

        in_preload = YES;

        if ((fp = fopen(tagsfile, "r")) == NULL)
                err(1, "preload_entries: %s", tagsfile);

        while (1) {
next:
                if (fgets(line, sizeof(line), fp) == NULL)
                        break;

                if ((eol = strchr(line, '\n')) == NULL)
                        errx(1, "preload_entries: line too long");
                *eol = '\0';

                /* extract entry */
                entry = line;
                if ((file = strchr(line, '\t')) == NULL)
                        errx(1, "preload_entries: couldn't parse entry: %s",
                            tagsfile);
                *file = '\0';

                /* extract file */
                file++;
                if ((pattern = strchr(file, '\t')) == NULL)
                        errx(1, "preload_entries: couldn't parse filename: %s",
                            tagsfile);
                *pattern = '\0';

                /* skip this file ? */
                for(i = 0; i < argc; i++)
                        if (strcmp(file, argv[i]) == 0)
                                goto next;

                /* rest of string is pattern */
                pattern++;

                /* grab searchar, and don't keep it around the pattern */
                if ((pattern[0] == '/' || pattern[0] == '?')
                    && pattern[1] == '^') {

                        i = strlen(pattern);
                        if (pattern[i-1] == pattern[0])
                                /* remove searchar at end */
                                pattern[i-1] = '\0';
                        else
                                errx(1, "preload_entries: couldn't parse "
                                    "pattern: %s", tagsfile);

                        /* remove searchar at begin */
                        pattern += 2;
                }

                /* add entry */
                if ((curfile = strdup(file)) == NULL)
                        err(1, "preload_entries: strdup");
                (void)strlcpy(lbuf, pattern, sizeof(lbuf));
                pfnote(entry, 0);
        }
        if (ferror(fp))
                err(1, "preload_entries: fgets");

        (void)fclose(fp);
        in_preload = NO;
}