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/*
* Copyright (C) 1984-2000 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information about less, or for information on how to
* contact the author, see the README file.
*/
#include "less.h"
#define WHITESP(c) ((c)==' ' || (c)=='\t')
#if TAGS
public char *tags = "tags";
static char *tagfile;
static char *tagpattern;
static int taglinenum;
static int tagendline;
extern int linenums;
extern int sigs;
extern int jump_sline;
/*
* Find a tag in the "tags" file.
* Sets "tagfile" to the name of the file containing the tag,
* and "tagpattern" to the search pattern which should be used
* to find the tag.
*/
public void
findtag(tag)
register char *tag;
{
char *p;
char *q;
register FILE *f;
register int taglen;
int search_char;
int err;
char tline[TAGLINE_SIZE];
p = unquote_file(tags);
f = fopen(p, "r");
free(p);
if (f == NULL)
{
error("No tags file", NULL_PARG);
tagfile = NULL;
return;
}
taglen = strlen(tag);
/*
* Search the tags file for the desired tag.
*/
while (fgets(tline, sizeof(tline), f) != NULL)
{
if (strncmp(tag, tline, taglen) != 0 || !WHITESP(tline[taglen]))
continue;
/*
* Found it.
* The line contains the tag, the filename and the
* location in the file, separated by white space.
* The location is either a decimal line number,
* or a search pattern surrounded by a pair of delimiters.
* Parse the line and extract these parts.
*/
tagfile = tagpattern = NULL;
taglinenum = 0;
/*
* Skip over the whitespace after the tag name.
*/
p = skipsp(tline+taglen);
if (*p == '\0')
/* File name is missing! */
continue;
/*
* Save the file name.
* Skip over the whitespace after the file name.
*/
tagfile = p;
while (!WHITESP(*p) && *p != '\0')
p++;
*p++ = '\0';
p = skipsp(p);
if (*p == '\0')
/* Pattern is missing! */
continue;
tagfile = save(tagfile);
/*
* First see if it is a line number.
*/
taglinenum = getnum(&p, 0, &err);
if (err)
{
/*
* No, it must be a pattern.
* Delete the initial "^" (if present) and
* the final "$" from the pattern.
* Delete any backslash in the pattern.
*/
taglinenum = 0;
search_char = *p++;
if (*p == '^')
p++;
tagpattern = (char *) ecalloc(strlen(p)+1, sizeof(char));
q = tagpattern;
while (*p != search_char && *p != '\0')
{
if (*p == '\\')
p++;
*q++ = *p++;
}
tagendline = (q[-1] == '$');
if (tagendline)
q--;
*q = '\0';
}
fclose(f);
return;
}
fclose(f);
error("No such tag in tags file", NULL_PARG);
tagfile = NULL;
}
public int
edit_tagfile()
{
int r;
if (tagfile == NULL)
return (1);
r = edit(tagfile);
free(tagfile);
tagfile = NULL;
return (r);
}
/*
* Search for a tag.
* This is a stripped-down version of search().
* We don't use search() for several reasons:
* - We don't want to blow away any search string we may have saved.
* - The various regular-expression functions (from different systems:
* regcmp vs. re_comp) behave differently in the presence of
* parentheses (which are almost always found in a tag).
*/
public POSITION
tagsearch()
{
POSITION pos, linepos;
int linenum;
int len;
char *line;
/*
* If we have the line number of the tag instead of the pattern,
* just use find_pos.
*/
if (taglinenum)
return (find_pos(taglinenum));
pos = ch_zero();
linenum = find_linenum(pos);
for (;;)
{
/*
* Get lines until we find a matching one or
* until we hit end-of-file.
*/
if (ABORT_SIGS())
return (NULL_POSITION);
/*
* Read the next line, and save the
* starting position of that line in linepos.
*/
linepos = pos;
pos = forw_raw_line(pos, &line);
if (linenum != 0)
linenum++;
if (pos == NULL_POSITION)
{
/*
* We hit EOF without a match.
*/
error("Tag not found", NULL_PARG);
return (NULL_POSITION);
}
/*
* If we're using line numbers, we might as well
* remember the information we have now (the position
* and line number of the current line).
*/
if (linenums)
add_lnum(linenum, pos);
/*
* Test the line to see if we have a match.
* Use strncmp because the pattern may be
* truncated (in the tags file) if it is too long.
* If tagendline is set, make sure we match all
* the way to end of line (no extra chars after the match).
*/
len = strlen(tagpattern);
if (strncmp(tagpattern, line, len) == 0 &&
(!tagendline || line[len] == '\0' || line[len] == '\r'))
break;
}
free(tagpattern);
tagpattern = NULL;
return (linepos);
}
#endif
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