getttyent.c 5.3 KB

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  1. /*
  2. * Copyright (c) 1989, 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 <features.h>
  30. #include <ttyent.h>
  31. #include <stdio.h>
  32. #include <stdio_ext.h>
  33. #include <ctype.h>
  34. #include <string.h>
  35. #include <stdlib.h>
  36. #ifdef __UCLIBC_HAS_THREADS__
  37. #include <pthread.h>
  38. #endif
  39. libc_hidden_proto(strchr)
  40. libc_hidden_proto(strcmp)
  41. libc_hidden_proto(strncmp)
  42. libc_hidden_proto(__fsetlocking)
  43. libc_hidden_proto(rewind)
  44. libc_hidden_proto(fgets_unlocked)
  45. libc_hidden_proto(getc_unlocked)
  46. libc_hidden_proto(__fgetc_unlocked)
  47. libc_hidden_proto(fopen)
  48. libc_hidden_proto(fclose)
  49. libc_hidden_proto(abort)
  50. #ifdef __UCLIBC_HAS_XLOCALE__
  51. libc_hidden_proto(__ctype_b_loc)
  52. #else
  53. libc_hidden_proto(__ctype_b)
  54. #endif
  55. static char zapchar;
  56. static FILE *tf;
  57. static struct ttyent tty;
  58. /* Skip over the current field, removing quotes, and return
  59. * a pointer to the next field.
  60. */
  61. #define QUOTED 1
  62. static char * skip(register char *p)
  63. {
  64. register char *t;
  65. register int c, q;
  66. for (q = 0, t = p; (c = *p) != '\0'; p++) {
  67. if (c == '"') {
  68. q ^= QUOTED; /* obscure, but nice */
  69. continue;
  70. }
  71. if (q == QUOTED && *p == '\\' && *(p+1) == '"')
  72. p++;
  73. *t++ = *p;
  74. if (q == QUOTED)
  75. continue;
  76. if (c == '#') {
  77. zapchar = c;
  78. *p = 0;
  79. break;
  80. }
  81. if (c == '\t' || c == ' ' || c == '\n') {
  82. zapchar = c;
  83. *p++ = 0;
  84. while ((c = *p) == '\t' || c == ' ' || c == '\n')
  85. p++;
  86. break;
  87. }
  88. }
  89. *--t = '\0';
  90. return (p);
  91. }
  92. static char * value(register char *p)
  93. {
  94. return ((p = strchr(p, '=')) ? ++p : NULL);
  95. }
  96. libc_hidden_proto(setttyent)
  97. int setttyent(void)
  98. {
  99. if (tf) {
  100. rewind(tf);
  101. return (1);
  102. } else if ((tf = fopen(_PATH_TTYS, "r"))) {
  103. /* We do the locking ourselves. */
  104. #ifdef __UCLIBC_HAS_THREADS__
  105. __fsetlocking (tf, FSETLOCKING_BYCALLER);
  106. #endif
  107. return (1);
  108. }
  109. return (0);
  110. }
  111. libc_hidden_def(setttyent)
  112. libc_hidden_proto(getttyent)
  113. struct ttyent * getttyent(void)
  114. {
  115. register int c;
  116. register char *p;
  117. static char *line = NULL;
  118. if (!tf && !setttyent())
  119. return (NULL);
  120. if (!line) {
  121. line = malloc(BUFSIZ);
  122. if (!line)
  123. abort();
  124. }
  125. __STDIO_ALWAYS_THREADLOCK(tf);
  126. for (;;) {
  127. if (!fgets_unlocked(p = line, BUFSIZ, tf)) {
  128. __STDIO_ALWAYS_THREADUNLOCK(tf);
  129. return (NULL);
  130. }
  131. /* skip lines that are too big */
  132. if (!strchr(p, '\n')) {
  133. while ((c = getc_unlocked(tf)) != '\n' && c != EOF)
  134. ;
  135. continue;
  136. }
  137. while (isspace(*p))
  138. ++p;
  139. if (*p && *p != '#')
  140. break;
  141. }
  142. zapchar = 0;
  143. tty.ty_name = p;
  144. p = skip(p);
  145. if (!*(tty.ty_getty = p))
  146. tty.ty_getty = tty.ty_type = NULL;
  147. else {
  148. p = skip(p);
  149. if (!*(tty.ty_type = p))
  150. tty.ty_type = NULL;
  151. else
  152. p = skip(p);
  153. }
  154. tty.ty_status = 0;
  155. tty.ty_window = NULL;
  156. #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
  157. #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
  158. for (; *p; p = skip(p)) {
  159. if (scmp(_TTYS_OFF))
  160. tty.ty_status &= ~TTY_ON;
  161. else if (scmp(_TTYS_ON))
  162. tty.ty_status |= TTY_ON;
  163. else if (scmp(_TTYS_SECURE))
  164. tty.ty_status |= TTY_SECURE;
  165. else if (vcmp(_TTYS_WINDOW))
  166. tty.ty_window = value(p);
  167. else
  168. break;
  169. }
  170. /* We can release the lock only here since `zapchar' is global. */
  171. __STDIO_ALWAYS_THREADUNLOCK(tf);
  172. if (zapchar == '#' || *p == '#')
  173. while ((c = *++p) == ' ' || c == '\t')
  174. ;
  175. tty.ty_comment = p;
  176. if (*p == 0)
  177. tty.ty_comment = 0;
  178. if ((p = strchr(p, '\n')))
  179. *p = '\0';
  180. return (&tty);
  181. }
  182. libc_hidden_def(getttyent)
  183. libc_hidden_proto(endttyent)
  184. int endttyent(void)
  185. {
  186. int rval;
  187. if (tf) {
  188. rval = !(fclose(tf) == EOF);
  189. tf = NULL;
  190. return (rval);
  191. }
  192. return (1);
  193. }
  194. libc_hidden_def(endttyent)
  195. struct ttyent * getttynam(const char *_tty)
  196. {
  197. register struct ttyent *t;
  198. setttyent();
  199. while ((t = getttyent()))
  200. if (!strcmp(_tty, t->ty_name))
  201. break;
  202. endttyent();
  203. return (t);
  204. }