kc3-lang/kc3/c3s/buf_readline.c

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• Hash : 3d8d7728
  Author : Thomas de Grivel
  Date : 2023-03-23T17:19:58
  

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• c3s/buf_readline.c

• /* c3
   * Copyright 2022,2023 kmx.io <contact@kmx.io>
   *
   * Permission is hereby granted to use this software granted the above
   * copyright notice and this permission paragraph are included in all
   * copies and substantial portions of this software.
   *
   * THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
   * PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
   * AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
   * THIS SOFTWARE.
   */
  #include <assert.h>
  #include <err.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include "../libc3/c3.h"
  
  typedef struct buf_readline {
    s_buf       buf;
  } s_buf_readline;
  
  sw buf_readline_refill_fgets (s_buf *buf);
  
  void buf_readline_close (s_buf *buf)
  {
    assert(buf);
    buf->refill = NULL;
    free(buf->user_ptr);
    buf->user_ptr = NULL;
  }
  
  s_buf * buf_readline_open_r (s_buf *buf)
  {
    s_buf_readline *buf_readline;
    assert(buf);
    buf_readline = malloc(sizeof(s_buf_readline));
    if (! buf_readline)
      errx(1, "buf_readline_open_r: out of memory");
    buf_init_1(&buf_readline->buf, "");
    buf->refill = buf_readline_refill_fgets;
    buf->user_ptr = buf_readline;
    return buf;
  }
  
  sw buf_readline_refill_fgets (s_buf *buf)
  {
    sw c = 0;
    uw result = 0;
    assert(buf);
    assert(buf->user_ptr);
    if (buf->rpos > buf->wpos ||
        buf->wpos > buf->size)
      return -1;
    if (feof(stdin))
      return -1;
    while (buf->wpos < buf->size &&
           c != '\n' &&
           (c = getchar()) != EOF &&
           c <= 255) {
      buf_write_u8(buf, c);
      result++;
    }
    return result;
  }
  

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