usr/src/usr.bin/uucp/libuu/cfgets.c

#ifndef lint
static char sccsid[] = "@(#)cfgets.c    5.1 (Berkeley) %G%";
#endif

/*
 * get nonblank, non-comment, (possibly continued) line. Alan S. Watt
 */

#include <stdio.h>
#define COMMENT         '#'
#define CONTINUE        '\\'
#define EOLN            '\n'
#define EOS             '\0'

char *
cfgets (buf, siz, fil)
register char *buf;
int siz;
FILE *fil;
{
        register char *s;
        register i, c, len;
        char *fgets();

        for (i=0,s=buf; i = (fgets (s, siz-i, fil) != NULL); i = s - buf) {

                /* get last character of line */
                c = s[len = (strlen (s) - 1)];

                /* skip comments; make sure end of comment line seen */
                if (*s == COMMENT) {
                        while (c != EOLN && c != EOF)
                                c = fgetc (fil);
                        *s = EOS;
                }

                /* skip blank lines */
                else if (*s != EOLN) {
                        s += len;

                        /* continue lines ending with CONTINUE */
                        if (c != EOLN || *--s != CONTINUE)
                                break;
                }
        }

        return (i ? buf : NULL);
}

#ifdef TEST
main()
{
        char buf[512];

        while (cfgets (buf, sizeof buf, stdin))
                fputs (buf, stdout);
}
#endif TEST