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ctags.c
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ctags.c
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/* ctags.c */
/* This is a reimplementation of the ctags(1) program. It supports ANSI C,
* and has heaps o' flags. It is meant to be distributed with elvis.
*
* 30.04.1995 Michael Beck & Dirk Verworner ([email protected])
* added support for inline definitions and
* function pointers in parameter declaration
*/
#include "elvis.h"
#ifdef FEATURE_RCSID
char id_ctags[] = "$Id: ctags.c,v 2.44 2003/10/17 17:41:23 steve Exp $";
#endif
#if OSEXPANDARGS
# define JUST_DIRFIRST
# include "osdir.c"
#endif
#ifndef FALSE
# define FALSE 0
# define TRUE 1
#endif
#ifndef TAGS
# define TAGS "tags"
#endif
#ifndef REFS
# define REFS "refs"
#endif
#ifndef BLKSIZE
# define BLKSIZE 512
#endif
#define TAGKIND_INDEX 3
#define TAGKIND attr[TAGKIND_INDEX]
/* #define EOF -1 */
#define DELETED 0
#define BODY 1
#define ARGS 2
#define COMMA 3
#define SEMICOLON 4
#define CLASSSEP 5
#define TYPEDEF 6
#define CLASS 7
#define STRUCT 8
#define UNION 9
#define ENUM 10
#define KSTATIC 11
#define EXTERN 12
#define NAME 13
#define INLINE 14
extern void file_open P_((char *));
extern int file_getc P_((void));
extern void file_ungetc P_((int));
extern int file_copyline P_((long, FILE *, char *));
extern void cpp_open P_((char *));
extern void cpp_echo P_((int));
extern int cpp_getc P_((void));
extern void cpp_ungetc P_((int));
extern int lex_gettoken P_((void));
extern void maketag P_((int, char*, long, long, int, char*, char *));
extern void mkbodytags P_((int, char*, char*, long));
extern void ctags P_((char *));
extern void usage P_((void));
extern int main P_((int, char **));
#if defined (GUI_WIN32)
extern void set_current_file (char *file_name);
extern void set_current_tags (int num_tags);
extern void set_total_tags (int num_tags);
static int num_tags = 0;
static int total_tags = 0;
#endif
/* support for elvis' ctype macros */
#include "ctypetbl.h"
/* -------------------------------------------------------------------------- */
/* Some global variables */
/* The following boolean variables are set according to command line flags */
char *del_word; /* -Dword ignore word -- good for parameter macro */
int backward; /* -B regexp patterns search backwards */
int use_numbers; /* -N use line numbers instead of regexp patterns */
int as_global; /* -g store static tags as though they were global */
int incl_static; /* -s include static tags */
int incl_extern; /* -e include extern tags */
int incl_types; /* -t include typedefs and structs */
int incl_vars; /* -v include variables */
int incl_inline; /* -i include inline's */
int make_parse; /* -p write parsed tokens to stdout */
int warn_duplicate; /* -d write warnings about duplicates to stdout */
int make_xtbl; /* -x write cross-reference table to stdout */
int make_tags = 1; /* generate a "tags" file (implied by lack of -x) */
int make_refs; /* -r generate a "refs" file */
int append_files; /* -a append to "tags" [and "refs"] files */
int add_hints; /* -h include extra fields that give elvis hints */
int add_ln; /* -l include line number in hints */
/* The following are used for outputting to the "tags" and "refs" files */
FILE *tags; /* used for writing to the "tags" file */
FILE *refs; /* used for writing to the "refs" file */
/* The following are either empty or store hints */
char hint_class[200];/* class name, for tags preceeded by a name and :: */
/* -------------------------------------------------------------------------- */
/* display a fatal error message from safe.c */
#if USE_PROTOTYPES
void msg(MSGIMP type, char *msg, ...)
#else
void msg(type, msg)
MSGIMP type;
char *msg;
#endif
{
fprintf(stderr, "%s\n", msg);
abort();
}
/* -------------------------------------------------------------------------- */
/* Most tag sorting functions try to sort by timestamp if nothing else. ctags
* is different -- it doesn't care about timestamps. To get this behavior,
* we define a custom version of dirtime here.
*/
char *dirtime(filename)
char *filename;
{
return "";
}
/* -------------------------------------------------------------------------- */
/* These are used for reading a source file. It keeps track of line numbers */
char *file_name; /* name of the current file */
FILE *file_fp; /* stream used for reading the file */
long file_lnum; /* line number in the current file */
long file_seek; /* fseek() offset to the start of current line */
int file_afternl; /* boolean: was previous character a newline? */
int file_prevch; /* a single character that was ungotten */
int file_header; /* boolean: is the current file a header file? */
/* This function opens a file, and resets the line counter. If it fails, it
* it will display an error message and leave the file_fp set to NULL.
*/
void file_open(name)
char *name; /* name of file to be opened */
{
/* if another file was already open, then close it */
if (file_fp)
{
fclose(file_fp);
}
/* try to open the file for reading. The file must be opened in
* "binary" mode because otherwise fseek() would misbehave under DOS.
*/
file_fp = fopen(name, "rb");
if (!file_fp)
{
perror(name);
}
/* reset the name & line number */
file_name = name;
file_lnum = 0L;
file_seek = 0L;
file_afternl = TRUE;
/* determine whether this is a header file */
file_header = FALSE;
name += strlen(name) - 2;
if (name >= file_name && name[0] == '.' && (name[1] == 'h' || name[1] == 'H'))
{
file_header = TRUE;
}
}
/* This function reads a single character from the stream. If the *previous*
* character was a newline, then it also increments file_lnum and sets
* file_offset.
*/
int file_getc()
{
int ch;
/* if there is an ungotten character, then return it. Don't do any
* other processing on it, though, because we already did that the
* first time it was read.
*/
if (file_prevch)
{
ch = file_prevch;
file_prevch = 0;
return ch;
}
/* if previous character was a newline, then we're starting a line */
if (file_afternl && file_fp)
{
file_afternl = FALSE;
file_seek = ftell(file_fp);
file_lnum++;
}
/* Get a character. If no file is open, then return EOF */
ch = (file_fp ? getc(file_fp) : EOF);
/* if it is a newline, then remember that fact */
if (ch == '\n')
{
file_afternl = TRUE;
}
/* return the character */
return ch;
}
/* This function ungets a character from the current source file */
void file_ungetc(ch)
int ch; /* character to be ungotten */
{
file_prevch = ch;
}
/* This function copies the current line out some other fp. It has no effect
* on the file_getc() function. During copying, any '\' characters are doubled
* and a leading '^' or trailing '$' is also quoted. The '\n' character is not
* copied. If the '\n' is preceded by a '\r', then the '\r' isn't copied.
*
* This is meant to be used when generating a tag line.
*/
int file_copyline(seek, fp, buf)
long seek; /* where the lines starts in the source file */
FILE *fp; /* the output stream to copy it to if buf==NULL */
char *buf; /* line buffer, or NULL to write to fp */
{
long oldseek;/* where the file's pointer was before we messed it up */
int ch; /* a single character from the file */
char next; /* the next character from this file */
char *build; /* where to store the next character */
/* go to the start of the line */
oldseek = ftell(file_fp);
fseek(file_fp, seek, 0);
/* write everything up to, but not including, the newline */
for (ch = getc(file_fp), build = buf; ch != '\n' && ch != EOF; ch = next)
{
/* if too many chars have been written already, then stop */
if (build && build >= &buf[160])
{
break;
}
/* preread the next character from this file */
next = getc(file_fp);
/* if character is '\', or a terminal '$', then quote it */
if (build && (ch == '\\'
|| ch == (backward ? '?' : '/')
|| (ch == '$' && next == '\n')))
{
*build++ = '\\';
}
/* copy the character, unless it is a terminal '\r' */
if (ch != '\r' || next != '\n')
{
if (build)
*build++ = ch;
else
putc(ch, fp);
}
}
/* mark the end of the line */
if (build)
*build = '\0';
/* seek back to the old position */
fseek(file_fp, oldseek, 0);
/* return 1 if it fit, 0 if it was truncated */
if (build && build >= &buf[160])
return 0;
else
return 1;
}
/* -------------------------------------------------------------------------- */
/* This section handles preprocessor directives. It strips out all of the
* directives, and may emit a tag for #define directives.
*/
int cpp_afternl; /* boolean: look for '#' character? */
int cpp_prevch; /* an ungotten character, if any */
int cpp_refsok; /* boolean: can we echo characters out to "refs"? */
int cpp_refsnl; /* boolean: dup next \n in "refs"? */
/* This function opens the file & resets variables */
void cpp_open(name)
char *name; /* name of source file to be opened */
{
/* use the lower-level file_open function to open the file */
file_open(name);
/* reset variables */
cpp_afternl = TRUE;
cpp_refsok = TRUE;
}
/* This function copies a character from the source file to the "refs" file */
void cpp_echo(ch)
int ch; /* the character to copy */
{
static int wasnl;
/* echo non-EOF chars, unless not making "ref", or echo turned off */
if (ch != EOF && make_refs && cpp_refsok && !file_header)
{
/* try to avoid blank lines */
if (ch == '\n')
{
/* hack: double \n at end of declarations, to
help `ref' find the right starting point...
*/
if (cpp_refsnl)
{
putc('\n', refs);
cpp_refsnl = FALSE;
}
if (wasnl)
{
return;
}
wasnl = TRUE;
}
else
{
wasnl = FALSE;
}
/* add the character */
putc(ch, refs);
}
}
/* This function returns the next character which isn't part of a directive */
int cpp_getc()
{
static
int ch; /* the next input character */
char *scan;
char name[50];/* name of a macro */
int len; /* length of macro name */
/* if we have an ungotten character, then return it */
if (cpp_prevch)
{
ch = cpp_prevch;
cpp_prevch = 0;
return ch;
}
/* Get a character from the file. Return it if not special '#' */
ch = file_getc();
if (ch == '\n')
{
cpp_afternl = TRUE;
cpp_echo(ch);
return ch;
}
else if (ch != '#' || !cpp_afternl)
{
/* normal character. Any non-whitespace should turn off afternl */
if (ch != ' ' && ch != '\t')
{
cpp_afternl = FALSE;
}
cpp_echo(ch);
return ch;
}
/* Yikes! We found a directive */
/* see whether this is a #define line */
scan = " define ";
while (*scan)
{
if (*scan == ' ')
{
/* space character matches any whitespace */
do
{
ch = file_getc();
} while (ch == ' ' || ch == '\t');
file_ungetc(ch);
}
else
{
/* other characters should match exactly */
ch = file_getc();
if (ch != *scan)
{
file_ungetc(ch);
break;
}
}
scan++;
}
/* is this a #define line? and should we generate a tag for it? */
if (!*scan)
{
/* collect chars of the tag name */
for (ch = file_getc(), len = 0;
elvalnum(ch) || ch == '_';
ch = file_getc())
{
if ((unsigned)len < sizeof(name) - 2)
{
name[len++] = ch;
}
}
name[len] = '\0';
/* maybe output parsing info */
if (make_parse)
{
printf("#define %s\n", name);
}
/* output a tag line */
maketag(file_header ? 0 : KSTATIC, name, file_lnum, file_seek, TRUE, "d", NULL);
}
/* skip to the end of the directive -- a newline that isn't preceded
* by a '\' character.
*/
while (ch != EOF && ch != '\n')
{
if (ch == '\\')
{
ch = file_getc();
}
ch = file_getc();
}
/* return the newline that we found at the end of the directive */
cpp_echo(ch);
return ch;
}
/* This puts a character back into the input queue for the source file */
void cpp_ungetc(ch)
int ch; /* a character to be ungotten */
{
cpp_prevch = ch;
}
/* -------------------------------------------------------------------------- */
/* This is the lexical analyzer. It gets characters from the preprocessor,
* and gives tokens to the parser. Some special codes are...
* (deleted) / *...* / (comments)
* (deleted) / /...\n (comments)
* (deleted) (* (parens used in complex declaration)
* (deleted) [...] (array subscript, when ... contains no ])
* (deleted) struct (intro to structure declaration)
* (deleted) :words{ (usually ":public baseclass {" in a class declaration
* BODY {...} ('{' can occur anywhere, '}' only at BOL if ... has '{')
* ARGS (...{ (args of function, not extern or forward)
* ARGS (...); (args of an extern/forward function declaration)
* COMMA , (separate declarations that have same scope)
* SEMICOLON ; (separate declarations that have different scope)
* SEMICOLON =...; (initializer)
* CLASSSEP :: (class separator)
* TYPEDEF typedef (the "typedef" keyword)
* KSTATIC static (the "static" keyword)
* KSTATIC private (the "static" keyword)
* KSTATIC PRIVATE (the "static" keyword)
* NAME [a-z]+ (really any valid name that isn't reserved word)
*/
char lex_name[BLKSIZE]; /* the name of a "NAME" token */
long lex_seek; /* start of line that contains lex_name */
long lex_lnum; /* line number of lex_name occurrence */
char lex_body[BLKSIZE]; /* space-delimited names from body */
int lex_gettoken()
{
char name[BLKSIZE]; /* stores a temporary word */
char newname[BLKSIZE];/* stores a temporary word */
int ch; /* a character from the preprocessor */
int next; /* the next character */
int token; /* the token that we'll return */
int par; /* '()' counter */
int hasname; /* have we seen an arg name lately? */
int i;
/* loop until we get a token that isn't "DELETED" */
do
{
/* get the next character */
ch = cpp_getc();
/* process the character */
switch (ch)
{
case ',':
token = COMMA;
break;
case ';':
token = SEMICOLON;
break;
case '/':
/* get the next character */
ch = cpp_getc();
switch (ch)
{
case '*': /* start of C comment */
ch = cpp_getc();
next = cpp_getc();
while (next != EOF && (ch != '*' || next != '/'))
{
ch = next;
next = cpp_getc();
}
break;
case '/': /* start of a C++ comment */
do
{
ch = cpp_getc();
} while (ch != '\n' && ch != EOF);
break;
default: /* some other slash */
cpp_ungetc(ch);
}
token = DELETED;
break;
case '(':
ch = cpp_getc();
if (ch == '*')
{
/* In a declaration such as (*name)(), we
* want to delete the (* but show the name.
*/
token = DELETED;
}
else
{
/* After the name of a function declaration or
* definition, we want to parse the args as a
* single token. New-style args are easy to
* parse, but old-style is not. Begin by
* parsing matching parentheses.
*/
for (par = 1; par > 0; ch = cpp_getc())
{
switch (ch)
{
case '(': par++; break;
case ')': par--; break;
case EOF: par = 0; break;
}
}
/* now we may have old-style arguments, or
* a semicolon or a '{'. We want to stop
* before the first semicolon which isn't
* preceded by a word, or before any '{'
*/
for (hasname = FALSE;
ch!=EOF && ch!='{' && (ch!=';' || hasname);
ch = cpp_getc())
{
if (elvalpha(ch) || ch == '_')
hasname = TRUE;
}
if (ch != EOF)
{
cpp_ungetc(ch);
}
token = ARGS;
}
break;
case '{':/*}*/
/* don't send the next characters to "refs" */
cpp_refsok = FALSE;
/* skip ahead to closing '}', or to embedded '{' */
i = hasname = 0;
*lex_body = '\0';
do
{
ch = cpp_getc();
if (elvalnum(ch) || ch == '_')
{
newname[i++] = ch;
}
else
{
/* is this the end of a name? */
if (i > 0)
{
/* mark the end of the name */
newname[i] = '\0';
i = 0;
/* store it, unless it is
* a name that is specifically
* supposed to be ignored, or
* appears to be a number.
*/
if (strcmp(newname, "P_")
&& strcmp(newname, "__P")
&& (!del_word || strcmp(newname, del_word))
&& !elvdigit(*newname))
{
hasname = 1;
strcpy(name, newname);
}
}
/* Skip comments. The best way to do
* this would be to recurse, but we do
* it the cheap way: skip everything
* between / and EOL.
*/
if (ch == '/')
{
while ((ch = cpp_getc()) != '\n')
{
}
}
/* the last name before a comma, '=', or
* semicolon should be saved so we can
* generate tags for the struct/enum
* body later.
*/
if (hasname && (ch == ',' || ch == '=' || ch == ';' || ch == '}'))
{
if (strlen(name) + strlen(lex_body) + 2 < QTY(lex_body))
{
if (*lex_body)
strcat(lex_body, " ");
strcat(lex_body, name);
}
hasname = 0;
}
/* the contents of parentheses should
* be skipped, so we see function names
* instead of parameter names as being
* the last name before a semicolon.
* Note that this doesn't work well for
* inline functions -- the {} trips it
* up.
*/
if (hasname && ch == '(')
{
i = 1;
do
{
ch = cpp_getc();
switch (ch)
{
case '(':
i++;
break;
case ')':
i--;
break;
case '{':
case '}':
case EOF:
i = 0;
break;
}
} while (i != 0);
}
}
} while (ch != '{' && ch != '}' && ch != EOF);
/* if has embedded '{', then skip to '}' in column 1 */
if (ch == '{') /*}*/
{
ch = cpp_getc();
next = cpp_getc();
while (ch != EOF && (ch != '\n' || next != '}'))/*{*/
{
ch = next;
next = cpp_getc();
}
}
/* resume "refs" processing */
cpp_refsok = TRUE;
cpp_echo('}');
token = BODY;
cpp_refsnl = TRUE;
break;
case '[':
/* skip to matching ']' */
do
{
ch = cpp_getc();
} while (ch != ']' && ch != EOF);
token = DELETED;
break;
case '=':
/* skip to next ';' */
do
{
ch = cpp_getc();
/* leave array initializers out of "refs" */
if (ch == '{')
{
cpp_refsok = FALSE;
}
} while (ch != ';' && ch != EOF);
/* resume echoing to "refs" */
if (!cpp_refsok)
{
cpp_refsok = TRUE;
cpp_echo('}');
cpp_echo(';');
}
token = SEMICOLON;
break;
case ':':
/* check for a second ':' */
ch = cpp_getc();
if (ch == ':')
{
token = CLASSSEP;
}
else
{
/* probably ": public baseclass {" in a class
* declaration.
*/
while (elvspace(ch) || elvalnum(ch) || ch == '_')
{
ch = cpp_getc();
}
cpp_ungetc(ch);
token = DELETED;
}
break;
case EOF:
token = EOF;
break;
default:
/* is this the start of a name/keyword? */
if (elvalpha(ch) || ch == '_')
{
/* collect the whole word */
name[0] = ch;
for (i = 1, ch = cpp_getc();
i < BLKSIZE - 1 && (elvalnum(ch) || ch == '_');
i++, ch = cpp_getc())
{
name[i] = ch;
}
name[i] = '\0';
cpp_ungetc(ch);
/* is it a reserved word? */
if (!strcmp(name, "typedef"))
{
token = TYPEDEF;
lex_seek = -1L;
}
else if (!strcmp(name, "class"))
{
token = CLASS;
lex_seek = -1L;
}
else if (!strcmp(name, "struct"))
{
token = STRUCT;
lex_seek = -1L;
}
else if (!strcmp(name, "union"))
{
token = UNION;
lex_seek = -1L;
}
else if (!strcmp(name, "enum"))
{
token = ENUM;
lex_seek = -1L;
}
else if (!strcmp(name, "static")
|| !strcmp(name, "private")
|| !strcmp(name, "protected")
|| !strcmp(name, "PRIVATE"))
{
token = KSTATIC;
/* ch already contains ungotten next
* char. If ':' then delete it.
*/
if (ch == ':')
(void)cpp_getc();
lex_seek = -1L;
}
else if (!strcmp(name, "extern")
|| !strcmp(name, "EXTERN")
|| !strcmp(name, "FORWARD")
|| !strcmp(name, "virtual"))
{
/* if `extern "C"' then skip chars
* up to following non-space char.
* If that char is '{', skip it too.
*/
do
{
ch = cpp_getc();
} while (elvspace(ch));
if (ch == '"')
{
do
{
ch = cpp_getc();
} while (ch != '"');
do
{
ch = cpp_getc();
} while (elvspace(ch));
if (ch != '{')
cpp_ungetc(ch);
token = DELETED;
}
else
{
cpp_ungetc(ch);
token = EXTERN;
lex_seek = -1L;
}
}
else if (!strcmp(name, "inline")
|| !strcmp(name, "__inline")
|| !strcmp(name, "__inline__"))
{
token = INLINE;
lex_seek = -1L;
}
else if (!strcmp(name, "public")
|| !strcmp(name, "P_")
|| !strcmp(name, "__P")
|| (del_word && !strcmp(name, del_word)))
{
token = DELETED;
lex_seek = -1L;
}
else if (!strcmp(name, "operator"))
{
token = NAME;
ch = cpp_getc();
while (strchr("[]<>=!%^&*+-?/:,|~", ch))
{
name[i++] = ch;
ch = cpp_getc();
}
cpp_ungetc(ch);
name[i] = '\0';
strcpy(lex_name, name);
lex_seek = file_seek;
lex_lnum = file_lnum;
}
else
{
token = NAME;
strcpy(lex_name, name);
lex_seek = file_seek;
lex_lnum = file_lnum;
}
}
else /* not part of a name/keyword */
{
token = DELETED;
}
} /* end switch(ch) */
} while (token == DELETED);
return token;
}
/* -------------------------------------------------------------------------- */
/* This is the parser. It locates tag candidates, and then decides whether to
* generate a tag for them.
*/
/* This function generates a tag for the object in lex_name, whose tag line is
* located at a given seek offset.
*/
void maketag(scope, name, lnum, seek, number, kind, inside)
int scope; /* 0 if global, or KSTATIC if static */
char *name; /* name of the tag */
long lnum; /* line number of the tag */
long seek; /* the seek offset of the line */
int number; /* 1 to give line number, or 0 to give regexp */
char *kind; /* token type of the tag: "f" for function, etc. */
char *inside;/* name of struct/enum that name is defined in */
{
TAG tag; /* structure for storing tag info */
char buf[300];
char lnbuf[20];
TAG *scan, *ref, *next;
/* if tag has a scope that we don't care about, ignore it */
if ((scope == EXTERN && !incl_extern)
|| (scope == KSTATIC && !incl_static))
{
return;
}
if (make_tags)
{
/* search for a matching name */
for (scan = taglist;
scan && strcmp(scan->TAGNAME, name) < 0;
scan = next)
{
if (scan->bighop && strcmp(scan->TAGNAME, name) < 0)
next = scan->bighop;
else
next = scan->next;
}
if (scan && strcmp(scan->TAGNAME, name) != 0)
scan = NULL;
/* Ensure that tags with kind="t" are unique. This is helpful
* because the parser can be stupid about typedef tags in some
* contexts.
*/
if (scan)
{
if (kind && !strcmp(kind, "t"))
{
/* this is a kind="t" tag */
/* delete it, and any other matches after it */
for (; scan && !strcmp(scan->TAGNAME,name); scan = next)
{
if (warn_duplicate)
printf("duplicate tag \"%s\" is typedef: keeping one from %s, not %ss\n", name, file_name, scan->TAGFILE);
/* make any references to it point to
* the next tag instead.
*/
for (ref=taglist; ref != scan; ref = next)
{
assert(ref != NULL);
next = ref->next;
if (ref->next == scan)
ref->next = scan->next;
if (ref->bighop == scan)
ref->bighop = scan->next;
}
if (taglist == scan)
taglist = scan->next;
/* delete this one */
(void)tagfree(scan);
}
}
else if (scan->TAGKIND && !strcmp(scan->TAGKIND, "t"))
{
/* This is not a kind="t" tag, but an existing
* duplicate tag is. Skip this new tag.
*/
if (warn_duplicate)
printf("duplicate tag \"%s\" skipped: existing tag is typedef\n", name);