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minix/commands/elvis/ctags.c
Arun Thomas 5706670029 Convert boot/ and commands/ over to bsdmake
2010-05-12 16:28:54 +00:00

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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.
*/
#include <stdio.h>
#include "config.h"
#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 1024
#endif
#include "ctype.c" /* yes, that really is the .c file, not the .h one. */
/* -------------------------------------------------------------------------- */
/* Some global variables */
/* The following boolean variables are set according to command line flags */
int incl_static; /* -s include static tags */
int incl_types; /* -t include typedefs and structs */
int incl_vars; /* -v include variables */
int make_refs; /* -r generate a "refs" file */
int append_files; /* -a append to "tags" [and "refs"] files */
/* 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 */
/* -------------------------------------------------------------------------- */
/* 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.
*/
#if MSDOS || TOS
file_fp = fopen(name, "rb");
#else
file_fp = fopen(name, "r");
#endif
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_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 '$' is also quoted. The newline character is
* not copied.
*
* This is meant to be used when generating a tag line.
*/
void file_copyline(seek, fp)
long seek; /* where the lines starts in the source file */
FILE *fp; /* the output stream to copy it to */
{
long oldseek;/* where the file's pointer was before we messed it up */
char ch; /* a single character from the file */
char next; /* the next character from this file */
/* go to the start of the line */
oldseek = ftell(file_fp);
fseek(file_fp, seek, 0);
/* if first character is '^', then emit \^ */
ch = getc(file_fp);
if (ch == '^')
{
putc('\\', fp);
putc('^', fp);
ch = getc(file_fp);
}
/* write everything up to, but not including, the newline */
while (ch != '\n')
{
/* preread the next character from this file */
next = getc(file_fp);
/* if character is '\', or a terminal '$', then quote it */
if (ch == '\\' || (ch == '$' && next == '\n'))
{
putc('\\', fp);
}
putc(ch, fp);
/* next character... */
ch = next;
}
/* seek back to the old position */
fseek(file_fp, oldseek, 0);
}
/* -------------------------------------------------------------------------- */
/* 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"? */
/* 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 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')
{
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;
/* 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 && (file_header || incl_static))
{
/* if not a header, then this will be a static tag */
if (!file_header)
{
fputs(file_name, tags);
putc(':', tags);
}
/* output the tag name */
for (ch = file_getc(); isalnum(ch) || ch == '_'; ch = file_getc())
{
putc(ch, tags);
}
/* output a tab, the filename, another tab, and the line number */
fprintf(tags, "\t%s\t%ld\n", file_name, file_lnum);
}
/* 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 */
cpp_ungetc(ch)
int ch; /* a character to be ungotten */
{
cpp_prevch = ch;
}
/* -------------------------------------------------------------------------- */
/* This is the lexical analyser. 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)
* BODY {...} ('{' can occur anywhere, '}' only at BOW 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)
* TYPEDEF typedef (the "typedef" keyword)
* STATIC static (the "static" keyword)
* STATIC private (the "static" keyword)
* STATIC PRIVATE (the "static" keyword)
* NAME [a-z]+ (really any valid name that isn't reserved word)
*/
/* #define EOF -1 */
#define DELETED 0
#define BODY 1
#define ARGS 2
#define COMMA 3
#define SEMICOLON 4
#define TYPEDEF 5
#define STATIC 6
#define EXTERN 7
#define NAME 8
char lex_name[BLKSIZE]; /* the name of a "NAME" token */
long lex_seek; /* start of line that contains lex_name */
lex_gettoken()
{
int ch; /* a character from the preprocessor */
int next; /* the next character */
int token; /* the token that we'll return */
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 == '*')
{
token = DELETED;
}
else
{
next = cpp_getc();
while (ch != '{' && ch != EOF && (ch != ')' || next != ';'))/*}*/
{
ch = next;
next = cpp_getc();
}
if (ch == '{')/*}*/
{
cpp_ungetc(ch);
}
else if (next == ';')
{
cpp_ungetc(next);
}
token = ARGS;
}
break;
case '{':/*}*/
/* don't send the next characters to "refs" */
cpp_refsok = FALSE;
/* skip ahead to closing '}', or to embedded '{' */
do
{
ch = cpp_getc();
} 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;
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 EOF:
token = EOF;
break;
default:
/* is this the start of a name/keyword? */
if (isalpha(ch) || ch == '_')
{
/* collect the whole word */
lex_name[0] = ch;
for (i = 1, ch = cpp_getc();
i < BLKSIZE - 1 && (isalnum(ch) || ch == '_');
i++, ch = cpp_getc())
{
lex_name[i] = ch;
}
lex_name[i] = '\0';
cpp_ungetc(ch);
/* is it a reserved word? */
if (!strcmp(lex_name, "typedef"))
{
token = TYPEDEF;
lex_seek = -1L;
}
else if (!strcmp(lex_name, "static")
|| !strcmp(lex_name, "private")
|| !strcmp(lex_name, "PRIVATE"))
{
token = STATIC;
lex_seek = -1L;
}
else if (!strcmp(lex_name, "extern")
|| !strcmp(lex_name, "EXTERN")
|| !strcmp(lex_name, "FORWARD"))
{
token = EXTERN;
lex_seek = -1L;
}
else
{
token = NAME;
lex_seek = file_seek;
}
}
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, seek)
int scope; /* 0 if global, or STATIC if static */
long seek; /* the seek offset of the line */
{
/* output the tagname and filename fields */
if (scope == EXTERN)
{
/* whoa! we should *never* output a tag for "extern" decl */
return;
}
else if (scope == STATIC)
{
fprintf(tags, "%s:%s\t%s\t", file_name, lex_name, file_name);
}
else
{
fprintf(tags, "%s\t%s\t", lex_name, file_name);
}
/* output the target line */
putc('/', tags);
putc('^', tags);
file_copyline(seek, tags);
putc('$', tags);
putc('/', tags);
putc('\n', tags);
}
/* This function parses a source file, adding any tags that it finds */
void ctags(name)
char *name; /* the name of a source file to be checked */
{
int prev; /* the previous token from the source file */
int token; /* the current token from the source file */
int scope; /* normally 0, but could be a TYPEDEF or STATIC token */
int gotname;/* boolean: does lex_name contain a tag candidate? */
long tagseek;/* start of line that contains lex_name */
/* open the file */
cpp_open(name);
/* reset */
scope = 0;
gotname = FALSE;
token = SEMICOLON;
/* parse until the end of the file */
while (prev = token, (token = lex_gettoken()) != EOF)
{
/* scope keyword? */
if (token == TYPEDEF || token == STATIC || token == EXTERN)
{
scope = token;
gotname = FALSE;
continue;
}
/* name of a possible tag candidate? */
if (token == NAME)
{
tagseek = file_seek;
gotname = TRUE;
continue;
}
/* if NAME BODY, without ARGS, then NAME is a struct tag */
if (gotname && token == BODY && prev != ARGS)
{
gotname = FALSE;
/* ignore if in typedef -- better name is coming soon */
if (scope == TYPEDEF)
{
continue;
}
/* generate a tag, if -t and maybe -s */
if (incl_types && (file_header || incl_static))
{
maketag(file_header ? 0 : STATIC, tagseek);
}
}
/* If NAME ARGS BODY, then NAME is a function */
if (gotname && prev == ARGS && token == BODY)
{
gotname = FALSE;
/* generate a tag, maybe checking -s */
if (scope != STATIC || incl_static)
{
maketag(scope, tagseek);
}
}
/* If NAME SEMICOLON or NAME COMMA, then NAME is var/typedef */
if (gotname && (token == SEMICOLON || token == COMMA))
{
gotname = FALSE;
/* generate a tag, if -v/-t and maybe -s */
if (scope == TYPEDEF && incl_types && (file_header || incl_static)
|| scope == STATIC && incl_vars && incl_static
|| incl_vars)
{
/* a TYPEDEF outside of a header is STATIC */
if (scope == TYPEDEF && !file_header)
{
maketag(STATIC, tagseek);
}
else /* use whatever scope was declared */
{
maketag(scope, tagseek);
}
}
}
/* reset after a semicolon or ARGS BODY pair */
if (token == SEMICOLON || (prev == ARGS && token == BODY))
{
scope = 0;
gotname = FALSE;
}
}
/* The source file will be automatically closed */
}
/* -------------------------------------------------------------------------- */
void usage()
{
fprintf(stderr, "usage: ctags [flags] filenames...\n");
fprintf(stderr, "\t-s include static functions\n");
fprintf(stderr, "\t-t include typedefs\n");
fprintf(stderr, "\t-v include variable declarations\n");
fprintf(stderr, "\t-r generate a \"refs\" file, too\n");
fprintf(stderr, "\t-a append to \"tags\", instead of overwriting\n");
exit(2);
}
#if AMIGA
# include "amiwild.c"
#endif
#if VMS
# include "vmswild.c"
#endif
main(argc, argv)
int argc;
char **argv;
{
int i, j;
#if MSDOS || TOS
char **wildexpand();
argv = wildexpand(&argc, argv);
#endif
/* build the tables used by the ctype macros */
_ct_init("");
/* parse the option flags */
for (i = 1; i < argc && argv[i][0] == '-'; i++)
{
for (j = 1; argv[i][j]; j++)
{
switch (argv[i][j])
{
case 's': incl_static = TRUE; break;
case 't': incl_types = TRUE; break;
case 'v': incl_vars = TRUE; break;
case 'r': make_refs = TRUE; break;
case 'a': append_files = TRUE; break;
default: usage();
}
}
}
/* There should always be at least one source file named in args */
if (i == argc)
{
usage();
}
/* open the "tags" and maybe "refs" files */
tags = fopen(TAGS, append_files ? "a" : "w");
if (!tags)
{
perror(TAGS);
exit(3);
}
if (make_refs)
{
refs = fopen(REFS, append_files ? "a" : "w");
if (!refs)
{
perror(REFS);
exit(4);
}
}
/* parse each source file */
for (; i < argc; i++)
{
ctags(argv[i]);
}
/* close "tags" and maybe "refs" */
fclose(tags);
if (make_refs)
{
fclose(refs);
}
#ifdef SORT
/* This is a hack which will sort the tags list. It should
* on UNIX and OS-9. You may have trouble with csh. Note
* that the tags list only has to be sorted if you intend to
* use it with the real vi; elvis permits unsorted tags.
*/
# if OSK
system("qsort tags >-_tags; -nx; del tags; rename _tags tags");
# else
system("sort tags >_tags$$; mv _tags$$ tags");
# endif
#endif
exit(0);
/*NOTREACHED*/
}
#if MSDOS || TOS
# define WILDCARD_NO_MAIN
# include "wildcard.c"
#endif
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