c3-lang/c3/libc3/buf_getc.c

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• Hash : 820c00e8
  Author : Thomas de Grivel
  Date : 2024-04-22T23:45:36
  CI :

  wip defmodule
  

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• libc3/buf_getc.c

• /* c3
   * Copyright 2022-2024 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 <errno.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  #include "../libc3/c3.h"
  
  static sw buf_getc_refill (s_buf *buf);
  
  void buf_getc_close (s_buf *buf)
  {
    FILE *fp;
    assert(buf);
    assert(buf->refill == buf_getc_refill);
    assert(buf->user_ptr);
    buf->refill = NULL;
    fp = buf->user_ptr;
    fclose(fp);
  }
  
  s_buf * buf_getc_open_r (s_buf *buf, const char *path)
  {
    FILE *fp;
    assert(buf);
    assert(! buf->refill);
    assert(! buf->user_ptr);
    fp = file_open(path, "rb");
    if (! fp)
      return NULL;
    buf->refill = buf_getc_refill;
    buf->user_ptr = fp;
    return buf;
  }
  
  sw buf_getc_refill (s_buf *buf)
  {
    sw c = 0;
    FILE *fp;
    uw result = 0;
    assert(buf);
    assert(buf->user_ptr);
    if (buf->rpos > buf->wpos ||
        buf->wpos > buf->size)
      return -1;
    fp = buf->user_ptr;
    if (feof(fp))
      return -1;
    while (buf->wpos < buf->size &&
           c != '\n' &&
           (c = getc(fp)) != EOF &&
           c <= 255) {
      buf_write_u8(buf, c);
      result++;
    }
    return result;
  }
  

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