setup.c

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#include        <stdio.h>
#include        <stdlib.h>
#include        "advent.h"

_PROTOTYPE(int main, (void));
_PROTOTYPE(void file_error, (char *));
_PROTOTYPE(void encode, (unsigned char *));

int main()
{

    FILE *isam, *src, *dest;
    char itxt[255];
    int cnt, i;
    long llen;
    char filename[12];
    static char *headername[] = {
       "idx1[MAXLOC]", "idx2[MAXLOC]", "idx3[MAXOBJ]", "idx4[MAXMSG]",
    };

    long x29 = (1L << 29), x30 = (1L << 30);
    if (!(x30 / 2 == x29 && 0L < x30 && x29 < x30)) {
        fprintf(stderr, "Sorry, advent needs 32-bit `long int's.\n");
        exit(EXIT_FAILURE);
    }
    isam = fopen("advtext.h", "w");
    if (!isam) {
        fprintf(stderr, "Sorry, I can't open advtext.h...\n");
        exit(EXIT_FAILURE);
    }
    fprintf(isam, "\n/*\theader: ADVTEXT.H\t\t\t\t\t*/\n\n\n");

    for (i = 1; i <= 4; i++) {
        cnt = -1;
        llen = 0L;
        sprintf(filename, "advent%d.txt", i);
        src = fopen(filename, "r");
        if (!src)
            file_error(filename);
        sprintf(filename, "advent%d.dat", i);
        dest = fopen(filename, "w");
        if (!dest)
            file_error(filename);
        fprintf(isam, "long\t%s = {\n\t", headername[i - 1]);
        while (fgets(itxt, 255, src)) {
            encode((unsigned char *) itxt);
            if (fprintf(dest, "%s\n", itxt) == EOF)
                file_error(filename);
            if (itxt[0] == '#') {
                if (llen)
                    fprintf(isam, "%ld,%s\t", llen,
                            &"\0\0\0\0\0\0\0\n"[++cnt & 7]);
                llen = ftell(dest);
                if (llen <= 0) {
                    fprintf(stderr, "ftell err in %s\n", filename);
                    exit(EXIT_FAILURE);
                }                       /* if (!llen)    */
            }                           /* if (itxt[0])  */
        }                               /* while fgets   */
        if (fprintf(isam, "%ld\n\t};\n\n", llen) == EOF)
            file_error("advtext.h");
        fclose(src);
        if (fclose(dest) == EOF)
            file_error(filename);
    }

    if (fclose(isam) == EOF)
        file_error("advtext.h");
    return EXIT_SUCCESS;
}                                       /* main          */

void file_error(filename)
char *filename;
{
    perror(filename);
    exit(EXIT_FAILURE);
}

_CONST unsigned char key[4] = {'c' | 0x80, 'L' | 0x80, 'y' | 0x80, 'D' | 0x80};

void encode(msg)
unsigned char *msg;
{
    register int i;

    for (i = 1; msg[i]; i++)
        msg[i] ^= key[i & 3];
    msg[--i] = '\0';
    return;
}

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