getline.c 1.6 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859
  1. /*
  2. * Check: a unit test framework for C
  3. * Copyright (C) 2001, 2002 Arien Malec
  4. *
  5. * This library is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU Lesser General Public
  7. * License as published by the Free Software Foundation; either
  8. * version 2.1 of the License, or (at your option) any later version.
  9. *
  10. * This library is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13. * Lesser General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU Lesser General Public
  16. * License along with this library; if not, write to the
  17. * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
  18. * MA 02110-1301, USA.
  19. */
  20. #include "libcompat.h"
  21. #include <stdio.h>
  22. #define INITIAL_SIZE 16
  23. #define DELIMITER '\n'
  24. ssize_t getline(char **lineptr, size_t *n, FILE *stream)
  25. {
  26. ssize_t written = 0;
  27. int character;
  28. if(*lineptr == NULL || *n < INITIAL_SIZE)
  29. {
  30. free(*lineptr);
  31. *lineptr = (char *)malloc(INITIAL_SIZE);
  32. *n = INITIAL_SIZE;
  33. }
  34. while( (character = fgetc(stream)) != EOF)
  35. {
  36. written += 1;
  37. if(written >= *n)
  38. {
  39. *n = *n * 2;
  40. *lineptr = realloc(*lineptr, *n);
  41. }
  42. (*lineptr)[written-1] = character;
  43. if(character == DELIMITER)
  44. {
  45. break;
  46. }
  47. }
  48. (*lineptr)[written] = '\0';
  49. return written;
  50. }