xref: /third_party/curl/lib/curl_get_line.c (revision 13498266) 
1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24
25#include "curl_setup.h"
26
27#if !defined(CURL_DISABLE_COOKIES) || !defined(CURL_DISABLE_ALTSVC) ||  \
28  !defined(CURL_DISABLE_HSTS) || !defined(CURL_DISABLE_NETRC)
29
30#include "curl_get_line.h"
31#include "curl_memory.h"
32/* The last #include file should be: */
33#include "memdebug.h"
34
35/*
36 * Curl_get_line() makes sure to only return complete whole lines that fit in
37 * 'len' bytes and end with a newline.
38 */
39char *Curl_get_line(char *buf, int len, FILE *input)
40{
41  bool partial = FALSE;
42  while(1) {
43    char *b = fgets(buf, len, input);
44
45    if(b) {
46      size_t rlen = strlen(b);
47
48      if(!rlen)
49        break;
50
51      if(b[rlen-1] == '\n') {
52        /* b is \n terminated */
53        if(partial) {
54          partial = FALSE;
55          continue;
56        }
57        return b;
58      }
59      else if(feof(input)) {
60        if(partial)
61          /* Line is already too large to return, ignore rest */
62          break;
63
64        if(rlen + 1 < (size_t) len) {
65          /* b is EOF terminated, insert missing \n */
66          b[rlen] = '\n';
67          b[rlen + 1] = '\0';
68          return b;
69        }
70        else
71          /* Maximum buffersize reached + EOF
72           * This line is impossible to add a \n to so we'll ignore it
73           */
74          break;
75      }
76      else
77        /* Maximum buffersize reached */
78        partial = TRUE;
79    }
80    else
81      break;
82  }
83  return NULL;
84}
85
86#endif /* if not disabled */
87