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fget.c

/*
 * Copyright (c) 2000-2001 Sendmail, Inc. and its suppliers.
 *      All rights reserved.
 * Copyright (c) 1990, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Chris Torek.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 */

#include <sm/gen.h>
SM_RCSID("@(#)$Id: fget.c,v 1.24 2001/09/11 04:04:48 gshapiro Exp $")
#include <stdlib.h>
#include <string.h>
#include <sm/io.h>
#include <sm/assert.h>
#include "local.h"

/*
**  SM_IO_FGETS -- get a string from a file
**
**  Read at most n-1 characters from the given file.
**  Stop when a newline has been read, or the count ('n') runs out.
**
**    Parameters:
**          fp -- the file to read from
**          timeout -- time to complete reading the string in milliseconds
**          buf -- buffer to place read string in
**          n -- size of 'buf'
**
**    Returns:
**          success: returns value of 'buf'
**          failure: NULL (no characters were read)
**          timeout: NULL and errno set to EAGAIN
**
**    Side Effects:
**          may move the file pointer
*/

char *
sm_io_fgets(fp, timeout, buf, n)
      register SM_FILE_T *fp;
      int timeout;
      char *buf;
      register int n;
{
      register int len;
      register char *s;
      register unsigned char *p, *t;

      SM_REQUIRE_ISA(fp, SmFileMagic);
      if (n <= 0)       /* sanity check */
            return NULL;

      s = buf;
      n--;              /* leave space for NUL */
      while (n > 0)
      {
            /* If the buffer is empty, refill it. */
            if ((len = fp->f_r) <= 0)
            {

                  /*
                  **  Timeout is only passed if we can't get the data
                  **  from the buffer (which is counted as immediately).
                  */

                  if (sm_refill(fp, timeout) != 0)
                  {
                        /* EOF/error: stop with partial or no line */
                        if (s == buf)
                              return NULL;
                        break;
                  }
                  len = fp->f_r;
            }
            p = fp->f_p;

            /*
            **  Scan through at most n bytes of the current buffer,
            **  looking for '\n'.  If found, copy up to and including
            **  newline, and stop.  Otherwise, copy entire chunk
            **  and loop.
            */

            if (len > n)
                  len = n;
            t = (unsigned char *) memchr((void *) p, '\n', len);
            if (t != NULL)
            {
                  len = ++t - p;
                  fp->f_r -= len;
                  fp->f_p = t;
                  (void) memcpy((void *) s, (void *) p, len);
                  s[len] = 0;
                  return buf;
            }
            fp->f_r -= len;
            fp->f_p += len;
            (void) memcpy((void *) s, (void *) p, len);
            s += len;
            n -= len;
      }
      *s = 0;
      return buf;
}

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