/* pnmtile.c - replicate a portable anymap into a specified size

**

** Copyright (C) 1989 by Jef Poskanzer.

**

** Permission to use, copy, modify, and distribute this software and its

** documentation for any purpose and without fee is hereby granted, provided

** that the above copyright notice appear in all copies and that both that

** copyright notice and this permission notice appear in supporting

** documentation.  This software is provided "as is" without express or

** implied warranty.

*/

#include "pm_c_util.h"

#include "mallocvar.h"

#include "shhopt.h"

#include "pnm.h"

struct cmdlineInfo {

    /* All the information the user supplied in the command line,

       in a form easy for the program to use.

    */

    const char * inputFileName;

    unsigned int width;

    unsigned int height;

};

static void

parseCommandLine(int argc, const char ** argv,

                 struct cmdlineInfo * const cmdlineP) {

/*----------------------------------------------------------------------------

   Note that the file spec array we return is stored in the storage that

   was passed to us as the argv array.

-----------------------------------------------------------------------------*/

    optEntry *option_def;

        /* Instructions to OptParseOptions3 on how to parse our options.

         */

    optStruct3 opt;

    unsigned int option_def_index;

    MALLOCARRAY_NOFAIL(option_def, 100);

    option_def_index = 0;   /* incremented by OPTENT3 */

    opt.opt_table = option_def;

    opt.short_allowed = FALSE;  /* We have no short (old-fashioned) options */

    opt.allowNegNum = FALSE;  /* We have no parms that are negative numbers */

    OPTENTINIT;

    pm_optParseOptions3(&argc, (char**)argv, opt, sizeof opt, 0);

        /* Uses and sets argc, argv, and some of *cmdlineP and others. */

    if (argc-1 < 2)

        pm_error("You must specify at least two parameters: "

                 "width and height.  You specified %u",

                 argc-1);

    else {

        cmdlineP->width  = pm_parse_width(argv[1]);

        cmdlineP->height = pm_parse_height(argv[2]);

        if (argc-1 > 2) {

            cmdlineP->inputFileName = argv[3];

            if (argc-1 > 3)

                pm_error("There are at most three arguments: "

                         "width, height, file name.  You specified %u",

                         argc-1);

        } else 

            cmdlineP->inputFileName = "-";

    }

}

int

main(int argc, const char ** argv) {

    struct cmdlineInfo cmdline;

    FILE * ifP;

    xel ** xels;

    xel * xelrow;

    xelval maxval;

    int rows, cols;

    int format;

    unsigned int row;

    pm_proginit(&argc, argv);

    parseCommandLine(argc, argv, &cmdline);

    ifP = pm_openr(cmdline.inputFileName);

    xels = pnm_readpnm(ifP, &cols, &rows, &maxval, &format);

    pm_close(ifP);

    xelrow = pnm_allocrow(cmdline.width);

    pnm_writepnminit(stdout, cmdline.width, cmdline.height, maxval, format, 0);

    for (row = 0; row < cmdline.height; ++row) {

        unsigned int col;

        for (col = 0; col < cmdline.width; ++col)

            xelrow[col] = xels[row % rows][col % cols];

        pnm_writepnmrow(stdout, xelrow, cmdline.width, maxval, format, 0);

    }

    pm_close(stdout);

    return 0;

}