/*
 * dos2unix Version 0.1
 * Bart Trzynadlowski, September 17, 2000
 * Public domain
 */

/*
 * Converts ASCII DOS files to UNIX format by turning 13,10->10
 * Usage: dos2unix <files> [-v]
 * -v,-V prints version information
 *
 * Contact Bart Trzynadlowski:
 *  Email: trzy@powernet.net
 *  WWW: http://www.powernet.net/~trzy
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main(int argc, char **argv)
{
    FILE    *fp;
    char    *buf;
    int     i, j, s;
    if (argc <= 1)
    {
        printf("dos2unix: No input file(s) specified\n");
        exit(0);
    }
    else
    {
        for (i = 1; i < argc; i++)
        {
            if (!strcmp(argv[i], "-v") || !strcmp(argv[i], "-V"))
            {
                printf("dos2unix: Version 0.1, September 17, 2000\n");
                exit(0);
            }
        }
    }

    for (i = 1; i < argc; i++)
    {
        if ((fp = fopen(argv[i], "rb")) == NULL)
            fprintf(stderr, "dos2unix: Warning: Failed to open \"%s\"\n", argv[i]);
        else
        {
            fseek(fp, 0, SEEK_END);
            fgetpos(fp, (void *) &s);   /* get size */
            rewind(fp);
            if ((buf = calloc(s + 1, sizeof(char))) == NULL)
                fprintf(stderr, "dos2unix: Warning: Not enough memory to load \"%s\"\n", argv[i]);
            else
            {
                fread(buf, sizeof(char), s, fp);
                fclose(fp);
                for (j = 0; j < s; j++)
                {
                    if (buf[j] == 13 && buf[j + 1] == 10)
                    {
                        memmove(&buf[j + 1], &buf[j + 2], s - (j + 2));
                        buf[j] = 10;
                        s--;
                    }
                }
                if ((fp = fopen(argv[i], "wb")) == NULL)
                    fprintf(stderr, "dos2unix: Warning: Failed to write back to \"%s\"\n", argv[i]);
                else
                    fwrite(buf, sizeof(char), s, fp);                    
                free(buf);
            }
        }
    }

    return 0;
}