opn.c 2.3 KB

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  1. /* $Id$ */
  2. /*
  3. * (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
  4. *
  5. * This product is part of the Amsterdam Compiler Kit.
  6. *
  7. * Permission to use, sell, duplicate or disclose this software must be
  8. * obtained in writing. Requests for such permissions may be sent to
  9. *
  10. * Dr. Andrew S. Tanenbaum
  11. * Wiskundig Seminarium
  12. * Vrije Universiteit
  13. * Postbox 7161
  14. * 1007 MC Amsterdam
  15. * The Netherlands
  16. *
  17. */
  18. /* Author: J.W. Stevenson */
  19. #include <pc_file.h>
  20. #include <pc_err.h>
  21. extern struct file **_extfl;
  22. extern int _extflc;
  23. extern struct file *_curfil;
  24. extern int _pargc;
  25. extern char **_pargv;
  26. extern char **_penvp;
  27. extern _cls();
  28. extern _xcls();
  29. extern _trp();
  30. extern int _getpid();
  31. extern int _creat();
  32. extern int _open();
  33. extern int _close();
  34. extern int _unlink();
  35. extern long _lseek();
  36. static int tmpfil() {
  37. static char namebuf[] = "/tmp/plf.xxxxx";
  38. int i; char *p,*q;
  39. i = _getpid();
  40. p = namebuf;
  41. q = p + 13;
  42. do
  43. *q++ = (i & 07) + '0';
  44. while (i >>= 3);
  45. *q = '\0';
  46. if ((i = _creat(p,0644)) < 0)
  47. if ((i = _creat(p += 4,0644)) < 0)
  48. if ((i = _creat(p += 5,0644)) < 0)
  49. goto error;
  50. if (_close(i) != 0)
  51. goto error;
  52. if ((i = _open(p,2)) < 0)
  53. goto error;
  54. if (_unlink(p) != 0)
  55. error: _trp(EREWR);
  56. return(i);
  57. }
  58. static int initfl(descr,sz,f) int descr; int sz; struct file *f; {
  59. int i;
  60. _curfil = f;
  61. if (sz == 0) {
  62. sz++;
  63. descr |= TXTBIT;
  64. }
  65. for (i=0; i<_extflc; i++)
  66. if (f == _extfl[i])
  67. break;
  68. if (i >= _extflc) { /* local file */
  69. f->fname = "LOCAL";
  70. if ((descr & WRBIT) == 0 && (f->flags & 0377) == MAGIC) {
  71. _xcls(f);
  72. if (_lseek(f->ufd,(long)0,0) == -1)
  73. _trp(ERESET);
  74. } else {
  75. _cls(f);
  76. f->ufd = tmpfil();
  77. }
  78. } else { /* external file */
  79. if (--i <= 0)
  80. return(0);
  81. if (i >= _pargc)
  82. _trp(EARGC);
  83. f->fname = _pargv[i];
  84. _cls(f);
  85. if ((descr & WRBIT) == 0) {
  86. if ((f->ufd = _open(f->fname,0)) < 0)
  87. _trp(ERESET);
  88. } else {
  89. if ((f->ufd = _creat(f->fname,0644)) < 0)
  90. _trp(EREWR);
  91. }
  92. }
  93. f->buflen = (sz>PC_BUFLEN ? sz : PC_BUFLEN-PC_BUFLEN%sz);
  94. f->size = sz;
  95. f->ptr = f->bufadr;
  96. f->flags = descr;
  97. return(1);
  98. }
  99. _opn(sz,f) int sz; struct file *f; {
  100. if (initfl(MAGIC,sz,f))
  101. f->count = 0;
  102. }
  103. _cre(sz,f) int sz; struct file *f; {
  104. if (initfl(WRBIT|EOFBIT|ELNBIT|MAGIC,sz,f))
  105. f->count = f->buflen;
  106. }