Annotation of src/usr.bin/mandoc/tag.c, Revision 1.15
1.15 ! schwarze 1: /* $OpenBSD: tag.c,v 1.14 2016/11/08 15:27:06 schwarze Exp $ */
1.1 schwarze 2: /*
1.14 schwarze 3: * Copyright (c) 2015, 2016 Ingo Schwarze <schwarze@openbsd.org>
1.1 schwarze 4: *
5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16: */
17: #include <sys/types.h>
18:
1.2 schwarze 19: #include <signal.h>
1.1 schwarze 20: #include <stddef.h>
1.7 schwarze 21: #include <stdint.h>
1.1 schwarze 22: #include <stdio.h>
23: #include <stdlib.h>
24: #include <string.h>
25: #include <unistd.h>
26:
27: #include "mandoc_aux.h"
1.10 schwarze 28: #include "mandoc_ohash.h"
1.1 schwarze 29: #include "tag.h"
30:
31: struct tag_entry {
1.14 schwarze 32: size_t *lines;
33: size_t maxlines;
34: size_t nlines;
1.4 schwarze 35: int prio;
1.1 schwarze 36: char s[];
37: };
38:
1.13 schwarze 39: static void tag_signal(int) __attribute__((noreturn));
1.1 schwarze 40:
41: static struct ohash tag_data;
1.6 schwarze 42: static struct tag_files tag_files;
1.1 schwarze 43:
44:
45: /*
1.6 schwarze 46: * Prepare for using a pager.
47: * Not all pagers are capable of using a tag file,
48: * but for simplicity, create it anyway.
1.1 schwarze 49: */
1.6 schwarze 50: struct tag_files *
1.1 schwarze 51: tag_init(void)
52: {
1.11 schwarze 53: struct sigaction sa;
1.6 schwarze 54: int ofd;
1.1 schwarze 55:
1.6 schwarze 56: ofd = -1;
57: tag_files.tfd = -1;
1.11 schwarze 58: tag_files.tcpgid = -1;
1.6 schwarze 59:
1.12 schwarze 60: /* Clean up when dying from a signal. */
61:
62: memset(&sa, 0, sizeof(sa));
63: sigfillset(&sa.sa_mask);
64: sa.sa_handler = tag_signal;
65: sigaction(SIGHUP, &sa, NULL);
66: sigaction(SIGINT, &sa, NULL);
67: sigaction(SIGTERM, &sa, NULL);
68:
69: /*
70: * POSIX requires that a process calling tcsetpgrp(3)
71: * from the background gets a SIGTTOU signal.
72: * In that case, do not stop.
73: */
74:
75: sa.sa_handler = SIG_IGN;
76: sigaction(SIGTTOU, &sa, NULL);
77:
1.6 schwarze 78: /* Save the original standard output for use by the pager. */
79:
80: if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1)
81: goto fail;
82:
83: /* Create both temporary output files. */
84:
85: (void)strlcpy(tag_files.ofn, "/tmp/man.XXXXXXXXXX",
86: sizeof(tag_files.ofn));
87: (void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX",
88: sizeof(tag_files.tfn));
89: if ((ofd = mkstemp(tag_files.ofn)) == -1)
90: goto fail;
91: if ((tag_files.tfd = mkstemp(tag_files.tfn)) == -1)
92: goto fail;
93: if (dup2(ofd, STDOUT_FILENO) == -1)
94: goto fail;
95: close(ofd);
96:
97: /*
98: * Set up the ohash table to collect output line numbers
99: * where various marked-up terms are documented.
100: */
1.1 schwarze 101:
1.10 schwarze 102: mandoc_ohash_init(&tag_data, 4, offsetof(struct tag_entry, s));
1.8 schwarze 103: return &tag_files;
1.6 schwarze 104:
105: fail:
106: tag_unlink();
107: if (ofd != -1)
108: close(ofd);
109: if (tag_files.ofd != -1)
110: close(tag_files.ofd);
111: if (tag_files.tfd != -1)
112: close(tag_files.tfd);
113: *tag_files.ofn = '\0';
114: *tag_files.tfn = '\0';
115: tag_files.ofd = -1;
116: tag_files.tfd = -1;
1.8 schwarze 117: return NULL;
1.1 schwarze 118: }
119:
120: /*
1.5 schwarze 121: * Set the line number where a term is defined,
122: * unless it is already defined at a higher priority.
1.1 schwarze 123: */
124: void
1.5 schwarze 125: tag_put(const char *s, int prio, size_t line)
1.1 schwarze 126: {
127: struct tag_entry *entry;
1.5 schwarze 128: size_t len;
1.1 schwarze 129: unsigned int slot;
130:
1.15 ! schwarze 131: /* Sanity checks. */
! 132:
! 133: if (tag_files.tfd <= 0)
! 134: return;
! 135: if (s[0] == '\\' && (s[1] == '&' || s[1] == 'e'))
! 136: s += 2;
! 137: if (*s == '\0' || strchr(s, ' ') != NULL)
1.1 schwarze 138: return;
1.14 schwarze 139:
1.5 schwarze 140: slot = ohash_qlookup(&tag_data, s);
1.1 schwarze 141: entry = ohash_find(&tag_data, slot);
1.14 schwarze 142:
1.1 schwarze 143: if (entry == NULL) {
1.14 schwarze 144:
145: /* Build a new entry. */
146:
1.5 schwarze 147: len = strlen(s) + 1;
148: entry = mandoc_malloc(sizeof(*entry) + len);
1.1 schwarze 149: memcpy(entry->s, s, len);
1.14 schwarze 150: entry->lines = NULL;
151: entry->maxlines = entry->nlines = 0;
1.1 schwarze 152: ohash_insert(&tag_data, slot, entry);
1.14 schwarze 153:
154: } else {
155:
156: /* A better entry is already present, ignore the new one. */
157:
158: if (entry->prio < prio)
159: return;
160:
161: /* The existing entry is worse, clear it. */
162:
163: if (entry->prio > prio)
164: entry->nlines = 0;
165: }
166:
167: /* Remember the new line. */
168:
169: if (entry->maxlines == entry->nlines) {
170: entry->maxlines += 4;
171: entry->lines = mandoc_reallocarray(entry->lines,
172: entry->maxlines, sizeof(*entry->lines));
173: }
174: entry->lines[entry->nlines++] = line;
1.4 schwarze 175: entry->prio = prio;
1.1 schwarze 176: }
177:
178: /*
179: * Write out the tags file using the previously collected
180: * information and clear the ohash table while going along.
181: */
182: void
183: tag_write(void)
184: {
185: FILE *stream;
186: struct tag_entry *entry;
1.14 schwarze 187: size_t i;
1.1 schwarze 188: unsigned int slot;
189:
1.6 schwarze 190: if (tag_files.tfd <= 0)
1.1 schwarze 191: return;
1.6 schwarze 192: stream = fdopen(tag_files.tfd, "w");
1.1 schwarze 193: entry = ohash_first(&tag_data, &slot);
194: while (entry != NULL) {
195: if (stream != NULL)
1.14 schwarze 196: for (i = 0; i < entry->nlines; i++)
197: fprintf(stream, "%s %s %zu\n",
198: entry->s, tag_files.ofn, entry->lines[i]);
199: free(entry->lines);
1.1 schwarze 200: free(entry);
201: entry = ohash_next(&tag_data, &slot);
202: }
203: ohash_delete(&tag_data);
204: if (stream != NULL)
205: fclose(stream);
206: }
207:
208: void
209: tag_unlink(void)
210: {
1.11 schwarze 211: pid_t tc_pgid;
1.1 schwarze 212:
1.11 schwarze 213: if (tag_files.tcpgid != -1) {
214: tc_pgid = tcgetpgrp(STDIN_FILENO);
215: if (tc_pgid == tag_files.pager_pid ||
216: tc_pgid == getpgid(0) ||
217: getpgid(tc_pgid) == -1)
218: (void)tcsetpgrp(STDIN_FILENO, tag_files.tcpgid);
219: }
1.6 schwarze 220: if (*tag_files.ofn != '\0')
221: unlink(tag_files.ofn);
222: if (*tag_files.tfn != '\0')
223: unlink(tag_files.tfn);
1.2 schwarze 224: }
225:
226: static void
227: tag_signal(int signum)
228: {
1.11 schwarze 229: struct sigaction sa;
1.2 schwarze 230:
231: tag_unlink();
1.11 schwarze 232: memset(&sa, 0, sizeof(sa));
233: sigemptyset(&sa.sa_mask);
234: sa.sa_handler = SIG_DFL;
235: sigaction(signum, &sa, NULL);
1.2 schwarze 236: kill(getpid(), signum);
237: /* NOTREACHED */
238: _exit(1);
1.1 schwarze 239: }
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