From f10f0fe3970de778125a29d73e65e63f32c138e1 Mon Sep 17 00:00:00 2001 From: Ingo Schwarze Date: Fri, 13 Mar 2020 15:32:28 +0000 Subject: Split tagging into a validation part including prioritization in tag.{h,c} and {mdoc,man}_validate.c and into a formatting part including command line argument checking in term_tag.{h,c}, html.c, and {mdoc|man}_{term|html}.c. Immediate functional benefits include: * Improved prioritization of automatic tags for .Em and .Sy. * Avoiding bogus automatic tags when .Em, .Fn, or .Sy are explicitly tagged. * Explicit tagging of .Er and .Fl now works in HTML output. * Automatic tagging of .IP and .TP now works in HTML output. But mainly, this patch provides clean earth to build further improvements on. Technical changes: * Main program: Write a tag file for ASCII and UTF-8 output only. * All formatters: There is no more need to delay writing the tags. * mdoc(7)+man(7) formatters: No more need for elaborate syntax tree inspection. * HTML formatter: If available, use the "string" attribute as the tag. * HTML formatter: New function to write permalinks, to reduce code duplication. Style cleanup in the vicinity while here: * mdoc(7) terminal formatter: To set up bold font for children, defer to termp_bold_pre() rather than calling term_fontpush() manually. * mdoc(7) terminal formatter: Garbage collect some duplicate functions. * mdoc(7) HTML formatter: Unify handling, delete redundant functions. * Where possible, use switch statements rather than if cascades. * Get rid of some more Yoda notation. The necessity for such changes was first discussed with kn@, but i didn't bother him with a request to review the resulting -673/+782 line patch. --- term_tag.c | 206 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 206 insertions(+) create mode 100644 term_tag.c (limited to 'term_tag.c') diff --git a/term_tag.c b/term_tag.c new file mode 100644 index 00000000..cb9fa16d --- /dev/null +++ b/term_tag.c @@ -0,0 +1,206 @@ +/* $Id: term_tag.c,v 1.1 2020/03/13 15:32:29 schwarze Exp $ */ +/* + * Copyright (c) 2015,2016,2018,2019,2020 Ingo Schwarze + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + * + * Functions to write a ctags(1) file. + * For use by the mandoc(1) ASCII and UTF-8 formatters only. + */ +#include "config.h" + +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "mandoc.h" +#include "roff.h" +#include "tag.h" +#include "term_tag.h" + +static void tag_signal(int) __attribute__((__noreturn__)); + +static struct tag_files tag_files; + + +/* + * Prepare for using a pager. + * Not all pagers are capable of using a tag file, + * but for simplicity, create it anyway. + */ +struct tag_files * +term_tag_init(char *tagname) +{ + struct sigaction sa; + int ofd; /* In /tmp/, dup(2)ed to stdout. */ + int tfd; + + ofd = tfd = -1; + tag_files.tfs = NULL; + tag_files.tcpgid = -1; + tag_files.tagname = tagname; + + /* Clean up when dying from a signal. */ + + memset(&sa, 0, sizeof(sa)); + sigfillset(&sa.sa_mask); + sa.sa_handler = tag_signal; + sigaction(SIGHUP, &sa, NULL); + sigaction(SIGINT, &sa, NULL); + sigaction(SIGTERM, &sa, NULL); + + /* + * POSIX requires that a process calling tcsetpgrp(3) + * from the background gets a SIGTTOU signal. + * In that case, do not stop. + */ + + sa.sa_handler = SIG_IGN; + sigaction(SIGTTOU, &sa, NULL); + + /* Save the original standard output for use by the pager. */ + + if ((tag_files.ofd = dup(STDOUT_FILENO)) == -1) { + mandoc_msg(MANDOCERR_DUP, 0, 0, "%s", strerror(errno)); + goto fail; + } + + /* Create both temporary output files. */ + + (void)strlcpy(tag_files.ofn, "/tmp/man.XXXXXXXXXX", + sizeof(tag_files.ofn)); + (void)strlcpy(tag_files.tfn, "/tmp/man.XXXXXXXXXX", + sizeof(tag_files.tfn)); + if ((ofd = mkstemp(tag_files.ofn)) == -1) { + mandoc_msg(MANDOCERR_MKSTEMP, 0, 0, + "%s: %s", tag_files.ofn, strerror(errno)); + goto fail; + } + if ((tfd = mkstemp(tag_files.tfn)) == -1) { + mandoc_msg(MANDOCERR_MKSTEMP, 0, 0, + "%s: %s", tag_files.tfn, strerror(errno)); + goto fail; + } + if ((tag_files.tfs = fdopen(tfd, "w")) == NULL) { + mandoc_msg(MANDOCERR_FDOPEN, 0, 0, "%s", strerror(errno)); + goto fail; + } + tfd = -1; + if (dup2(ofd, STDOUT_FILENO) == -1) { + mandoc_msg(MANDOCERR_DUP, 0, 0, "%s", strerror(errno)); + goto fail; + } + close(ofd); + return &tag_files; + +fail: + term_tag_unlink(); + if (ofd != -1) + close(ofd); + if (tfd != -1) + close(tfd); + if (tag_files.ofd != -1) { + close(tag_files.ofd); + tag_files.ofd = -1; + } + tag_files.tagname = NULL; + return NULL; +} + +void +term_tag_write(struct roff_node *n, size_t line) +{ + const char *cp; + int len; + + if (tag_files.tfs == NULL) + return; + if (n->string == NULL) + n = n->child; + cp = n->string; + if (cp[0] == '\\' && (cp[1] == '&' || cp[1] == 'e')) + cp += 2; + len = strcspn(cp, " \t\\"); + fprintf(tag_files.tfs, "%.*s %s %zu\n", + len, cp, tag_files.ofn, line); +} + +void +term_tag_finish(void) +{ + if (tag_files.tfs == NULL) + return; + fclose(tag_files.tfs); + tag_files.tfs = NULL; + switch (tag_check(tag_files.tagname)) { + case TAG_EMPTY: + unlink(tag_files.tfn); + *tag_files.tfn = '\0'; + /* FALLTHROUGH */ + case TAG_MISS: + if (tag_files.tagname == NULL) + break; + mandoc_msg(MANDOCERR_TAG, 0, 0, "%s", tag_files.tagname); + tag_files.tagname = NULL; + break; + case TAG_OK: + break; + } +} + +void +term_tag_unlink(void) +{ + pid_t tc_pgid; + + if (tag_files.tcpgid != -1) { + tc_pgid = tcgetpgrp(tag_files.ofd); + if (tc_pgid == tag_files.pager_pid || + tc_pgid == getpgid(0) || + getpgid(tc_pgid) == -1) + (void)tcsetpgrp(tag_files.ofd, tag_files.tcpgid); + } + if (*tag_files.ofn != '\0') { + unlink(tag_files.ofn); + *tag_files.ofn = '\0'; + } + if (*tag_files.tfn != '\0') { + unlink(tag_files.tfn); + *tag_files.tfn = '\0'; + } + if (tag_files.tfs != NULL) { + fclose(tag_files.tfs); + tag_files.tfs = NULL; + } +} + +static void +tag_signal(int signum) +{ + struct sigaction sa; + + term_tag_unlink(); + memset(&sa, 0, sizeof(sa)); + sigemptyset(&sa.sa_mask); + sa.sa_handler = SIG_DFL; + sigaction(signum, &sa, NULL); + kill(getpid(), signum); + /* NOTREACHED */ + _exit(1); +} -- cgit v1.2.3-56-ge451