/usr.bin/vis/foldit.c

https://bitbucket.org/freebsd/freebsd-head/ · C · 76 lines · 37 code · 7 blank · 32 comment · 3 complexity · c51721d7ef138369c90f0adeb5b36818 MD5 · raw file

  1. /*-
  2. * Copyright (c) 1990, 1993
  3. * The Regents of the University of California. All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 4. Neither the name of the University nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. */
  29. #include <sys/cdefs.h>
  30. __FBSDID("$FreeBSD$");
  31. #ifndef lint
  32. static const char sccsid[] = "@(#)foldit.c 8.1 (Berkeley) 6/6/93";
  33. #endif
  34. #include <stdio.h>
  35. #include "extern.h"
  36. int
  37. foldit(char *chunk, int col, int max)
  38. {
  39. char *cp;
  40. /*
  41. * Keep track of column position. Insert hidden newline
  42. * if this chunk puts us over the limit.
  43. */
  44. again:
  45. cp = chunk;
  46. while (*cp) {
  47. switch(*cp) {
  48. case '\n':
  49. case '\r':
  50. col = 0;
  51. break;
  52. case '\t':
  53. col = (col + 8) &~ 07;
  54. break;
  55. case '\b':
  56. col = col ? col - 1 : 0;
  57. break;
  58. default:
  59. col++;
  60. }
  61. if (col > (max - 2)) {
  62. printf("\\\n");
  63. col = 0;
  64. goto again;
  65. }
  66. cp++;
  67. }
  68. return (col);
  69. }