/usr.bin/mail/strings.c

https://bitbucket.org/freebsd/freebsd-head/ · C · 124 lines · 63 code · 10 blank · 51 comment · 15 complexity · 9b9e184efa7c987de079fb8b0be24ca4 MD5 · raw file

  1. /*
  2. * Copyright (c) 1980, 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. #ifndef lint
  30. #if 0
  31. static char sccsid[] = "@(#)strings.c 8.1 (Berkeley) 6/6/93";
  32. #endif
  33. #endif /* not lint */
  34. #include <sys/cdefs.h>
  35. __FBSDID("$FreeBSD$");
  36. /*
  37. * Mail -- a mail program
  38. *
  39. * String allocation routines.
  40. * Strings handed out here are reclaimed at the top of the command
  41. * loop each time, so they need not be freed.
  42. */
  43. #include "rcv.h"
  44. #include "extern.h"
  45. /*
  46. * Allocate size more bytes of space and return the address of the
  47. * first byte to the caller. An even number of bytes are always
  48. * allocated so that the space will always be on a word boundary.
  49. * The string spaces are of exponentially increasing size, to satisfy
  50. * the occasional user with enormous string size requests.
  51. */
  52. char *
  53. salloc(int size)
  54. {
  55. char *t;
  56. int s, index;
  57. struct strings *sp;
  58. s = size;
  59. s += (sizeof(char *) - 1);
  60. s &= ~(sizeof(char *) - 1);
  61. index = 0;
  62. for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
  63. if (sp->s_topFree == NULL && (STRINGSIZE << index) >= s)
  64. break;
  65. if (sp->s_nleft >= s)
  66. break;
  67. index++;
  68. }
  69. if (sp >= &stringdope[NSPACE])
  70. errx(1, "String too large");
  71. if (sp->s_topFree == NULL) {
  72. index = sp - &stringdope[0];
  73. if ((sp->s_topFree = malloc(STRINGSIZE << index)) == NULL)
  74. err(1, "No room for space %d", index);
  75. sp->s_nextFree = sp->s_topFree;
  76. sp->s_nleft = STRINGSIZE << index;
  77. }
  78. sp->s_nleft -= s;
  79. t = sp->s_nextFree;
  80. sp->s_nextFree += s;
  81. return (t);
  82. }
  83. /*
  84. * Reset the string area to be empty.
  85. * Called to free all strings allocated
  86. * since last reset.
  87. */
  88. void
  89. sreset(void)
  90. {
  91. struct strings *sp;
  92. int index;
  93. if (noreset)
  94. return;
  95. index = 0;
  96. for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++) {
  97. if (sp->s_topFree == NULL)
  98. continue;
  99. sp->s_nextFree = sp->s_topFree;
  100. sp->s_nleft = STRINGSIZE << index;
  101. index++;
  102. }
  103. }
  104. /*
  105. * Make the string area permanent.
  106. * Meant to be called in main, after initialization.
  107. */
  108. void
  109. spreserve(void)
  110. {
  111. struct strings *sp;
  112. for (sp = &stringdope[0]; sp < &stringdope[NSPACE]; sp++)
  113. sp->s_topFree = NULL;
  114. }