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curl_get_line.c 2.4 KB

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  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. #include "curl_setup.h"
  25. #if !defined(CURL_DISABLE_COOKIES) || !defined(CURL_DISABLE_ALTSVC) || \
  26. !defined(CURL_DISABLE_HSTS) || !defined(CURL_DISABLE_NETRC)
  27. #include "curl_get_line.h"
  28. #include "curl_memory.h"
  29. /* The last #include file should be: */
  30. #include "memdebug.h"
  31. /*
  32. * Curl_get_line() makes sure to only return complete whole lines that fit in
  33. * 'len' bytes and end with a newline.
  34. */
  35. char *Curl_get_line(char *buf, int len, FILE *input)
  36. {
  37. bool partial = FALSE;
  38. while(1) {
  39. char *b = fgets(buf, len, input);
  40. if(b) {
  41. size_t rlen = strlen(b);
  42. if(!rlen)
  43. break;
  44. if(b[rlen-1] == '\n') {
  45. /* b is \n terminated */
  46. if(partial) {
  47. partial = FALSE;
  48. continue;
  49. }
  50. return b;
  51. }
  52. else if(feof(input)) {
  53. if(partial)
  54. /* Line is already too large to return, ignore rest */
  55. break;
  56. if(rlen + 1 < (size_t) len) {
  57. /* b is EOF terminated, insert missing \n */
  58. b[rlen] = '\n';
  59. b[rlen + 1] = '\0';
  60. return b;
  61. }
  62. else
  63. /* Maximum buffersize reached + EOF
  64. * This line is impossible to add a \n to so we'll ignore it
  65. */
  66. break;
  67. }
  68. else
  69. /* Maximum buffersize reached */
  70. partial = TRUE;
  71. }
  72. else
  73. break;
  74. }
  75. return NULL;
  76. }
  77. #endif /* if not disabled */