usr/src/usr.bin/cmp/special.c

/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)special.c   8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "extern.h"

void
c_special(fd1, file1, skip1, fd2, file2, skip2)
        int fd1, fd2;
        char *file1, *file2;
        register off_t skip1, skip2;
{
        register int ch1, ch2;
        register off_t byte, line;
        FILE *fp1, *fp2;
        int dfound;

        if ((fp1 = fdopen(fd1, "r")) == NULL)
                err("%s: %s", file1, strerror(errno));
        if ((fp2 = fdopen(fd2, "r")) == NULL)
                err("%s: %s", file1, strerror(errno));

        while (skip1--)
                if (getc(fp1) == EOF)
                        goto eof;
        while (skip2--)
                if (getc(fp2) == EOF)
                        goto eof;

        dfound = 0;
        for (byte = line = 1;; ++byte) {
                ch1 = getc(fp1);
                ch2 = getc(fp2);
                if (ch1 == EOF || ch2 == EOF)
                        break;
                if (ch1 != ch2)
                        if (lflag) {
                                dfound = 1;
                                (void)printf("%6qd %3o %3o\n", byte, ch1, ch2);
                        } else
                                diffmsg(file1, file2, byte, line);
                                /* NOTREACHED */
                if (ch1 == '\n')
                        ++line;
        }

eof:    if (ferror(fp1))
                err("%s: %s", file1, strerror(errno));
        if (ferror(fp2))
                err("%s: %s", file2, strerror(errno));
        if (feof(fp1)) {
                if (!feof(fp2))
                        eofmsg(file1);
        } else
                if (feof(fp2))
                        eofmsg(file2);
        if (dfound)
                exit(1);
}