/*
  Copyright (C) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
  Portions Copyright (C) 2008-2020 David Anderson.  All Rights Reserved.

  This program is free software; you can redistribute it
  and/or modify it under the terms of version 2.1 of the
  GNU Lesser General Public License as published by the Free
  Software Foundation.

  This program is distributed in the hope that it would be
  useful, but WITHOUT ANY WARRANTY; without even the implied
  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  PURPOSE.

  Further, this software is distributed without any warranty
  that it is free of the rightful claim of any third person
  regarding infringement or the like.  Any license provided
  herein, whether implied or otherwise, applies only to this
  software file.  Patent licenses, if any, provided herein
  do not apply to combinations of this program with other
  software, or any other product whatsoever.

  You should have received a copy of the GNU Lesser General
  Public License along with this program; if not, write the
  Free Software Foundation, Inc., 51 Franklin Street - Fifth
  Floor, Boston MA 02110-1301, USA.

*/

#include "config.h"
#include "dwarf_incl.h"
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>  /* For exit(), strtoul() declaration etc. */
#endif

#include "dwarf_errmsg_list.h"


#define FALSE 0
#define TRUE 1
/* This is just to help localize the error. */
static void
printone(int i)
{
    int arraysize = sizeof(_dwarf_errmsgs) / sizeof(char *);
    if ( i >= arraysize) {
        printf("%d is outside the array! Missing something!\n",i);
    } else {
        printf("%d is: %s\n",i,_dwarf_errmsgs[i]);
    }
}

/* Arbitrary. A much smaller max length value would work. */
#define MAX_NUM_LENGTH 12

/* return TRUE on error */
static int
check_errnum_mismatches(unsigned i)
{
    unsigned nextstop = 0;
    const char *sp = _dwarf_errmsgs[i];
    const char *cp = sp;
    unsigned innit = FALSE;
    unsigned prevchar = 0;
    unsigned value = 0;

    for( ; *cp; cp++) {
        unsigned c = 0;
        c = 0xff & *cp;
        if ( c >= '0' && c <= '9' && !innit
            && prevchar != '(') {
            /* Skip. number part of macro name. */
            prevchar = c;
            continue;
        }
        if ( c >= '0' && c <= '9') {
            value = value * 10;
            value += (c - '0');
            nextstop++;
            if (nextstop > MAX_NUM_LENGTH) {
                break;
            }
            innit = TRUE;
        } else {
            if (innit) {
                break;
            }
            prevchar= c;
        }
    }
    if (innit) {
        if (i != value) {
            return TRUE;
        }
        return FALSE;
    }
    /* There is no number to check. Ignore it. */
    printf("mismatch value %d has no errnum to check %s\n",i,_dwarf_errmsgs[i]);
    return TRUE;
}

/* We don't allow arbitrary DW_DLE line length. */
#define MAXDEFINELINE 200

static int
splmatches(char *base, unsigned baselen,char *test)
{
    if (baselen != strlen(test) ) {
        return FALSE;
    }
    for ( ; *test; ++test,++base) {
        if (*test != *base) {
            return FALSE;
        }
    }
    return TRUE;
}

static void
check_dle_list(const char *path)
{
    /*  The format should be
        #define<space>name<spaces>number<spaces>optional-c-comment
        and we are intentionally quite rigid about it all except
        that the number of spaces before any comment is allowed. */
    char buffer[MAXDEFINELINE];
    unsigned linenum = 0;
    unsigned long prevdefval = 0;
    unsigned foundlast = 0;
    unsigned foundlouser = 0;
    FILE*fin = 0;

    fin = fopen(path, "r");
    if(!fin) {
        printf("Unable to open define list to read %s\n",path);
        exit(1);
    }
    for(;;++linenum) {
        char *line = 0;
        unsigned linelen = 0;
        char *  curdefname = 0;
        char *  pastname = 0;
        unsigned curdefname_len = 0;
        char *numstart = 0;
        char * endptr = 0;
        unsigned long v = 0;

        line = fgets(buffer,MAXDEFINELINE,fin);
        if(!line) {
            break;
        }
        linelen = strlen(line);
        if (linelen >= (unsigned)(MAXDEFINELINE-1)) {
            printf("define line %u is too long!\n",linenum);
            exit(1);
        }
        if(strncmp(line,"#define DW_DLE_",15)) {
            printf("define line %u has wrong leading chars!\n",linenum);
            exit(1);
        }
        curdefname = line+8;
        /* ASSERT: line ends with NUL byte. */
        for( ; ; curdefname_len++) {
            if (foundlouser) {
                printf("define line %u has  stuff after DW_DLE_LO_USER!\n",
                    linenum);
                exit(1);
            }
            pastname = curdefname +curdefname_len;
            if (!*pastname) {
                /* At end of line. Missing value. */
                printf("define line %u of %s: has no number value!\n",
                    linenum,path);
                exit(1);
            }
            if (*pastname == ' ') {
                /* Ok. Now look for value. */
                numstart = pastname + 1;
                break;
            }
        }
        /* strtoul skips leading whitespace. */
        v = strtoul(numstart,&endptr,0);
        /*  This test is a bit odd. But is valid till
            we decide it is inappropriate. */
        if (v > DW_DLE_LO_USER) {
            printf("define line %u: number value unreasonable. %lu\n",
                linenum,v);
            exit(1);
        }
        if (v == 0 && endptr == numstart) {
            printf("define line %u of %s: number value missing.\n",
                linenum,path);
            printf("Leaving a space as in #define A B 3"
                " in libdwarf.h.in will cause this.\n");
            exit(1);
        }
        if (*endptr != ' ' && *endptr != '\n') {
            printf("define line %u: number value terminates oddly\n",
                linenum);
            exit(1);
        }
        if (splmatches(curdefname,curdefname_len,"DW_DLE_LAST")) {
            if (foundlast) {
                printf("duplicated DW_DLE_LAST! line %u\n",linenum);
                exit(1);
            }
            foundlast = 1;
            if (v != prevdefval) {
                printf("Invalid: Last value mismatch! %lu vs %lu\n",
                    v,prevdefval);
            }
        } else if (splmatches(curdefname,curdefname_len,"DW_DLE_LO_USER")) {
            if (!foundlast) {
                printf("error:expected DW_DLE_LO_USER after LAST! line %u\n",
                    linenum);
                exit(1);
            }
            if (foundlouser) {
                printf("Error:duplicated DW_DLE_LO_USER! line %u\n",
                    linenum);
                exit(1);
            }
            foundlouser = 1;
            continue;
        } else {
            if (linenum > 0) {
                if (v != prevdefval+1) {
                    printf("Invalid: Missing value! %lu vs %lu\n",
                        prevdefval,v);
                    exit(1);
                }
            }
            prevdefval = v;
        }
        /* Ignoring rest of line for now. */
    }
    fclose(fin);
}

int
main(int argc, char **argv)
{
    unsigned arraysize = sizeof(_dwarf_errmsgs) / sizeof(char *);
    unsigned i = 0;
    const char *path = 0;

    if (argc != 3) {
        printf("Expected -f <filename> of DW_DLE lines from libdwarf.h");
        exit(1);
    }
    if (strcmp(argv[1],"-f")) {
        printf("Expected -f");
        exit(1);
    }
    path = argv[2];
    check_dle_list(path);


    if (arraysize != (DW_DLE_LAST + 1)) {
        printf("Missing or extra entry in dwarf error strings array"
            " %u expected DW_DLE_LAST+1 %d\n",arraysize, DW_DLE_LAST+1);
        printone(1);
        printone(100);
        printone(200);
        printone(250);
        printone(260);
        printone(262);
        printone(263);
        printone(264);
        printone(265);
        printone(273);
        printone(274);
        printone(275);
        printone(300);
        printone(328);
        exit(1);
    }
    for ( i = 0; i <= DW_DLE_LAST; ++i) {
        if(check_errnum_mismatches(i)) {
            printf("mismatch value %d is: %s\n",i,_dwarf_errmsgs[i]);
            exit(1);
        }
    }
    /* OK. */
    exit(0);
}