/* Append an input line to a String.
*
* Returns a pointer to the character string (or 0).
* Leading whitespace and newlines are removed.
*
* Empty lines and lines starting with '#' are ignored.
*/
extern char *
s_getline(Biobuf *fp, String *to)
{
int c;
int len=0;
s_terminate(to);
/* end of input */
if ((c = Bgetc(fp)) < 0)
return 0;
/* take care of inconsequentials */
for(;;) {
/* eat leading white */
while(c==' ' || c=='\t' || c=='\n' || c=='\r')
c = Bgetc(fp);
if(c < 0)
return 0;
/* take care of comments */
if(c == '#'){
do {
c = Bgetc(fp);
if(c < 0)
return 0;
} while(c != '\n');
continue;
}
/* if we got here, we've gotten something useful */
break;
}
/* gather up a line */
for(;;) {
len++;
switch(c) {
case -1:
s_terminate(to);
return len ? to->ptr-len : 0;
case '\\':
c = Bgetc(fp);
if (c != '\n') {
s_putc(to, '\\');
s_putc(to, c);
}
break;
case '\n':
s_terminate(to);
return len ? to->ptr-len : 0;
default:
s_putc(to, c);
break;
}
c = Bgetc(fp);
}
}
