ex/ex_util.c

   1 /*-
   2  * Copyright (c) 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * %sccs.include.redist.c%
   6  */
   7
   8 #ifndef lint
   9 static char sccsid[] = "$Id: ex_util.c,v 8.3 1993/11/13 18:02:32 bostic Exp $ (Berkeley) $Date: 1993/11/13 18:02:32 $";
  10 #endif /* not lint */
  11
  12 #include <sys/types.h>
  13
  14 #include <errno.h>
  15 #include <stdlib.h>
  16 #include <string.h>
  17
  18 #include "vi.h"
  19 #include "excmd.h"
  20
  21 /*
  22  * ex_getline --
  23  *      Return a line from the terminal.
  24  */
  25 int
  26 ex_getline(sp, fp, lenp)
  27         SCR *sp;
  28         FILE *fp;
  29         size_t *lenp;
  30 {
  31         EX_PRIVATE *exp;
  32         size_t off;
  33         int ch;
  34         char *p;
  35
  36         exp = EXP(sp);
  37         for (off = 0, p = exp->ibp;; ++off) {
  38                 ch = getc(fp);
  39                 if (off >= exp->ibp_len) {
  40                         BINC(sp, exp->ibp, exp->ibp_len, off + 1);
  41                         p = exp->ibp + off;
  42                 }
  43                 if (ch == EOF || ch == '\n') {
  44                         if (ch == EOF && !off)
  45                                 return (1);
  46                         *lenp = off;
  47                         return (0);
  48                 }
  49                 *p++ = ch;
  50         }
  51         /* NOTREACHED */
  52 }