small tool to recover some files clobbered by ASCII mode conversions

ftp-repair.c

#include <stdio.h>

int main(int argc, char **argv)
{
    FILE    *fi, *fo;
    char    c1, c2;
    
    if (argc != 3)
    {
        printf("Usage: %s <in> <out>\n", argv[0]);
        return 1;
    }
    
    fi = fopen(argv[1], "rb");
    fo = fopen(argv[2], "wb");
    
    while (!feof(fi))
    {
        fscanf(fi, "%c", &c1);
        if (feof(fi))
          break;
        if (c1 != '\x0d' || feof(fi))
        {
            fprintf(fo, "%c", c1);
            continue;
        }
loop:
        fscanf(fi, "%c", &c2);
        if (c2 != '\x0d' || feof(fi))
        {
            if (c2 != '\x0a')
                fprintf(fo, "%c", c1);
            fprintf(fo, "%c", c2);
        }
        else
          if (c2 =='\x0d')
          {
            fprintf(fo, "%c", c1);
            c1 = c2;
            goto loop;
          }
    }
    fclose(fi);
    fclose(fo);
}