opn.c 2.2 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 <stdlib.h>
  20. #include <unistd.h>
  21. #include <pc_file.h>
  22. #include <pc_err.h>
  23. extern struct file **_extfl;
  24. extern int _extflc;
  25. extern struct file *_curfil;
  26. extern int _pargc;
  27. extern char **_pargv;
  28. extern char **_penvp;
  29. extern _cls();
  30. extern _xcls();
  31. extern _trp();
  32. static int tmpfil() {
  33. static char namebuf[] = "/tmp/plf.xxxxx";
  34. int i; char *p,*q;
  35. i = getpid();
  36. p = namebuf;
  37. q = p + 13;
  38. do
  39. *q++ = (i & 07) + '0';
  40. while (i >>= 3);
  41. *q = '\0';
  42. if ((i = creat(p,0644)) < 0)
  43. if ((i = creat(p += 4,0644)) < 0)
  44. if ((i = creat(p += 5,0644)) < 0)
  45. goto error;
  46. if (close(i) != 0)
  47. goto error;
  48. if ((i = open(p,2)) < 0)
  49. goto error;
  50. if (remove(p) != 0)
  51. error: _trp(EREWR);
  52. return(i);
  53. }
  54. static int initfl(descr,sz,f) int descr; int sz; struct file *f; {
  55. int i;
  56. _curfil = f;
  57. if (sz == 0) {
  58. sz++;
  59. descr |= TXTBIT;
  60. }
  61. for (i=0; i<_extflc; i++)
  62. if (f == _extfl[i])
  63. break;
  64. if (i >= _extflc) { /* local file */
  65. f->fname = "LOCAL";
  66. if ((descr & WRBIT) == 0 && (f->flags & 0377) == MAGIC) {
  67. _xcls(f);
  68. if (lseek(f->ufd,(long)0,0) == -1)
  69. _trp(ERESET);
  70. } else {
  71. _cls(f);
  72. f->ufd = tmpfil();
  73. }
  74. } else { /* external file */
  75. if (--i <= 0)
  76. return(0);
  77. if (i >= _pargc)
  78. _trp(EARGC);
  79. f->fname = _pargv[i];
  80. _cls(f);
  81. if ((descr & WRBIT) == 0) {
  82. if ((f->ufd = _open(f->fname,0)) < 0)
  83. _trp(ERESET);
  84. } else {
  85. if ((f->ufd = _creat(f->fname,0644)) < 0)
  86. _trp(EREWR);
  87. }
  88. }
  89. f->buflen = (sz>PC_BUFLEN ? sz : PC_BUFLEN-PC_BUFLEN%sz);
  90. f->size = sz;
  91. f->ptr = f->bufadr;
  92. f->flags = descr;
  93. return(1);
  94. }
  95. _opn(sz,f) int sz; struct file *f; {
  96. if (initfl(MAGIC,sz,f))
  97. f->count = 0;
  98. }
  99. _cre(sz,f) int sz; struct file *f; {
  100. if (initfl(WRBIT|EOFBIT|ELNBIT|MAGIC,sz,f))
  101. f->count = f->buflen;
  102. }