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|
/* fix-header.c - Make C header file suitable for C++.
Copyright (C) 1993 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* This program massages a system include file (such as stdio.h),
into a form more conformant with ANSI/POSIX, and more suitable for C++:
* extern "C" { ... } braces are added (inside #ifndef __cplusplus),
if they seem to be needed. These prevent C++ compilers from name
mangling the functions inside the braces.
* If an old-style incomplete function declaration is seen (without
an argument list), and it is a "standard" function listed in
the file sys-protos.h (and with a non-empty argument list), then
the declaration is converted to a complete prototype by replacing
the empty parameter list with the argument lust from sys-protos.h.
* The program can be given a list of (names of) required standard
functions (such as fclose for stdio.h). If a reqquired function
is not seen in the input, then a prototype for it will be
written to the output.
* If all of the non-comment code of the original file is protected
against multiple inclusion:
#ifndef FOO
#define FOO
<body of include file>
#endif
then extra matter added to the include file is placed inside the <body>.
* If the input file is OK (nothing needs to be done);
the output file is not written (nor removed if it exists).
There are also some special actions that are done for certain
well-known standard include files:
* If argv[1] is "sys/stat.h", the Posix.1 macros
S_ISBLK, S_ISCHR, S_ISDIR, S_ISFIFO, S_ISLNK, S_ISREG are added if
they were missing, and the corresponding "traditional" S_IFxxx
macros were defined.
* If argv[1] is "errno.h", errno is declared if it was missing.
* TODO: The input file should be read complete into memory, because:
a) it needs to be scanned twice anyway, and
b) it would be nice to allow update in place.
Usage:
fix-header FOO.H INFILE.H OUTFILE.H REQUIRED_FUNCS <SCAN-FILE
where:
* FOO.H is the relative file name of the include file,
as it would be #include'd by a C file. (E.g. stdio.h)
* INFILE.H is a full pathname for the input file (e.g. /usr/include/stdio.h)
* OUTFILE.H is the full pathname for where to write the output file,
if anything needs to be done. (e.g. ./include/stdio.h)
* SCAN-FILE is the output of the scan-decls program.
* REQUIRED_FUNCS is a list of required function (e.g. fclose for stdio.h).
Written by Per Bothner <bothner@cygnus.com>, July 1993. */
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#include "hconfig.h"
#include "obstack.h"
#include "scan.h"
int verbose = 0;
int partial_count = 0;
int missing_extern_C_count = 0;
int missing_errno = 0;
#include "xsys-protos.h"
char *inf_buffer;
char *inf_limit;
char *inf_ptr;
/* Certain standard files get extra treatment */
enum special_file
{
no_special,
errno_special,
sys_stat_special
};
enum special_file special_file_handling = no_special;
/* The following are only used when handling sys/stat.h */
/* They are set if the corresponding macro has been seen. */
int seen_S_IFBLK = 0, seen_S_ISBLK = 0;
int seen_S_IFCHR = 0, seen_S_ISCHR = 0;
int seen_S_IFDIR = 0, seen_S_ISDIR = 0;
int seen_S_IFIFO = 0, seen_S_ISFIFO = 0;
int seen_S_IFLNK = 0, seen_S_ISLNK = 0;
int seen_S_IFREG = 0, seen_S_ISREG = 0;
/* Wrapper around free, to avoid prototype clashes. */
void
xfree (ptr)
char *ptr;
{
free (ptr);
}
/* Avoid error if config defines abort as fancy_abort.
It's not worth "really" implementing this because ordinary
compiler users never run fix-header. */
void
fancy_abort ()
{
abort ();
}
#define obstack_chunk_alloc xmalloc
#define obstack_chunk_free xfree
struct obstack scan_file_obstack;
/* NOTE: If you edit this, also edit gen-protos.c !! */
struct fn_decl *
lookup_std_proto (name)
char *name;
{
int i = hash (name) % HASH_SIZE;
int i0 = i;
for (;;)
{
struct fn_decl *fn;
if (hash_tab[i] == 0)
return NULL;
fn = &std_protos[hash_tab[i]];
if (strcmp (fn->fname, name) == 0)
return fn;
i = (i+1) % HASH_SIZE;
if (i == i0)
abort ();
}
}
char *inc_filename;
int inc_filename_length;
char *progname = "fix-header";
FILE *outf;
sstring buf;
sstring line;
int lbrac_line, rbrac_line;
char **required_functions;
int required_unseen_count;
int
write_lbrac ()
{
if (missing_extern_C_count + required_unseen_count > 0)
fprintf (outf, "#ifdef __cplusplus\nextern \"C\" {\n#endif\n");
if (partial_count)
{
fprintf (outf, "#ifndef _PARAMS\n");
fprintf (outf, "#if defined(__STDC__) || defined(__cplusplus)\n");
fprintf (outf, "#define _PARAMS(ARGS) ARGS\n");
fprintf (outf, "#else\n");
fprintf (outf, "#define _PARAMS(ARGS) ()\n");
fprintf (outf, "#endif\n#endif /* _PARAMS */\n");
}
}
struct partial_proto
{
struct partial_proto *next;
char *fname; /* name of function */
char *rtype; /* return type */
struct fn_decl *fn;
int line_seen;
};
struct partial_proto *partial_proto_list = NULL;
struct partial_proto required_dummy_proto;
#define REQUIRED(FN) ((FN)->partial == &required_dummy_proto)
#define SET_REQUIRED(FN) ((FN)->partial = &required_dummy_proto)
#define CLEAR_REQUIRED(FN) ((FN)->partial = 0)
void
recognized_macro (fname)
char *fname;
{
/* The original include file defines fname as a macro. */
struct fn_decl *fn = lookup_std_proto (fname);
/* Since fname is a macro, don't require a prototype for it. */
if (fn && REQUIRED (fn))
{
CLEAR_REQUIRED (fn);
required_unseen_count--;
}
switch (special_file_handling)
{
case errno_special:
if (strcmp (fname, "errno") == 0) missing_errno = 0;
break;
case sys_stat_special:
if (fname[0] == 'S' && fname[1] == '_')
{
if (strcmp (fname, "S_IFBLK") == 0) seen_S_IFBLK++;
else if (strcmp (fname, "S_ISBLK") == 0) seen_S_ISBLK++;
else if (strcmp (fname, "S_IFCHR") == 0) seen_S_IFCHR++;
else if (strcmp (fname, "S_ISCHR") == 0) seen_S_ISCHR++;
else if (strcmp (fname, "S_IFDIR") == 0) seen_S_IFDIR++;
else if (strcmp (fname, "S_ISDIR") == 0) seen_S_ISDIR++;
else if (strcmp (fname, "S_IFIFO") == 0) seen_S_IFIFO++;
else if (strcmp (fname, "S_ISFIFO") == 0) seen_S_ISFIFO++;
else if (strcmp (fname, "S_IFLNK") == 0) seen_S_IFLNK++;
else if (strcmp (fname, "S_ISLNK") == 0) seen_S_ISLNK++;
else if (strcmp (fname, "S_IFREG") == 0) seen_S_IFREG++;
else if (strcmp (fname, "S_ISREG") == 0) seen_S_ISREG++;
}
}
}
void
recognized_extern (name, type)
char *name;
char *type;
{
switch (special_file_handling)
{
case errno_special:
if (strcmp (name, "errno") == 0) missing_errno = 0;
break;
}
}
/* Called by scan_decls if it saw a function definition for a function
named FNAME, with return type RTYPE, and argument list ARGS,
in source file FILE_SEEN on line LINE_SEEN.
KIND is 'I' for an inline function;
'F' if a normal function declaration preceded by 'extern "C"'
(or nested inside 'extern "C"' braces); or
'f' for other function declarations. */
void
recognized_function (fname, kind, rtype, args, file_seen, line_seen)
char *fname;
int kind; /* One of 'f' 'F' or 'I' */
char *rtype;
char *args;
char *file_seen;
int line_seen;
{
struct partial_proto *partial;
int i;
struct fn_decl *fn;
if (kind == 'f')
missing_extern_C_count++;
fn = lookup_std_proto (fname);
/* Remove the function from the list of required function. */
if (fn && REQUIRED (fn))
{
CLEAR_REQUIRED (fn);
required_unseen_count--;
}
/* If we have a full prototype, we're done. */
if (args[0] != '\0')
return;
if (kind == 'I') /* don't edit inline function */
return;
/* If the partial prototype was included from some other file,
we don't need to patch it up (in this run). */
i = strlen (file_seen);
if (i < inc_filename_length
|| strcmp (inc_filename, file_seen + (i - inc_filename_length)) != 0)
return;
if (fn == NULL)
return;
if (fn->params[0] == '\0' || strcmp (fn->params, "void") == 0)
return;
/* We only have a partial function declaration,
so remember that we have to add a complete prototype. */
partial_count++;
partial = (struct partial_proto*)
obstack_alloc (&scan_file_obstack, sizeof (struct partial_proto));
partial->fname = obstack_alloc (&scan_file_obstack, strlen (fname) + 1);
strcpy (partial->fname, fname);
partial->rtype = obstack_alloc (&scan_file_obstack, strlen (rtype) + 1);
strcpy (partial->rtype, rtype);
partial->line_seen = line_seen;
partial->fn = fn;
fn->partial = partial;
partial->next = partial_proto_list;
partial_proto_list = partial;
if (verbose)
{
fprintf (stderr, "(%s: %s non-prototype function declaration.)\n",
inc_filename, fname);
}
}
void
read_scan_file (scan_file)
FILE *scan_file;
{
char **rptr;
obstack_init (&scan_file_obstack);
scan_decls (scan_file);
if (missing_extern_C_count + required_unseen_count + partial_count
+ missing_errno == 0)
{
if (verbose)
fprintf (stderr, "%s: OK, nothing needs to be done.\n", inc_filename);
exit (0);
}
if (!verbose)
fprintf (stderr, "%s: fixing %s\n", progname, inc_filename);
else
{
if (required_unseen_count)
fprintf (stderr, "%s: %d missing function declarations.\n",
inc_filename, required_unseen_count);
if (partial_count)
fprintf (stderr, "%s: %d non-prototype function declarations.\n",
inc_filename, partial_count);
if (missing_extern_C_count)
fprintf (stderr,
"%s: %d declarations not protected by extern \"C\".\n",
inc_filename, missing_extern_C_count);
}
}
write_rbrac ()
{
struct fn_decl *fn;
char **rptr;
register struct partial_proto *partial;
if (required_unseen_count)
fprintf (outf, "#if defined(__STDC__) || defined(__cplusplus)\n");
/* Now we print out prototypes for those functions that we haven't seen. */
for (rptr = required_functions; *rptr; rptr++)
{
int macro_protect = 0;
fn = lookup_std_proto (*rptr);
if (fn == NULL || !REQUIRED (fn))
continue;
/* In the case of memmove, protect in case the application
defines it as a macro before including the header. */
if (!strcmp (fn->fname, "memmove")
|| !strcmp (fn->fname, "vprintf")
|| !strcmp (fn->fname, "vfprintf")
|| !strcmp (fn->fname, "vsprintf"))
macro_protect = 1;
if (macro_protect)
fprintf (outf, "#ifndef %s\n", fn->fname);
fprintf (outf, "extern %s %s (%s);\n",
fn->rtype, fn->fname, fn->params);
if (macro_protect)
fprintf (outf, "#endif\n");
}
if (required_unseen_count)
fprintf (outf,
"#endif /* defined(__STDC__) || defined(__cplusplus) */\n");
switch (special_file_handling)
{
case errno_special:
if (missing_errno)
fprintf (outf, "extern int errno;\n");
break;
case sys_stat_special:
if (!seen_S_ISBLK && seen_S_IFBLK)
fprintf (outf,
"#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)\n");
if (!seen_S_ISCHR && seen_S_IFCHR)
fprintf (outf,
"#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)\n");
if (!seen_S_ISDIR && seen_S_IFDIR)
fprintf (outf,
"#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)\n");
if (!seen_S_ISFIFO && seen_S_IFIFO)
fprintf (outf,
"#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO)\n");
if (!seen_S_ISLNK && seen_S_IFLNK)
fprintf (outf,
"#define S_ISLNK(mode) (((mode) & S_IFMT) == S_IFLNK)\n");
if (!seen_S_ISREG && seen_S_IFREG)
fprintf (outf,
"#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)\n");
break;
}
if (missing_extern_C_count + required_unseen_count > 0)
fprintf (outf, "#ifdef __cplusplus\n}\n#endif\n");
}
char *
strdup (str)
char *str;
{
char *copy = (char *) xmalloc (strlen (str) + 1);
strcpy (copy, str);
return copy;
}
/* Returns 1 iff the file is properly protected from multiple inclusion:
#ifndef PROTECT_NAME
#define PROTECT_NAME
#endif
*/
#define INF_GET() (inf_ptr < inf_limit ? *(unsigned char*)inf_ptr++ : EOF)
#define INF_UNGET(c) ((c)!=EOF && inf_ptr--)
int
inf_skip_spaces (c)
int c;
{
for (;;)
{
if (c == ' ' || c == '\t')
c = INF_GET ();
else if (c == '/')
{
c = INF_GET ();
if (c != '*')
{
INF_UNGET (c);
return '/';
}
c = INF_GET ();
for (;;)
{
if (c == EOF)
return EOF;
else if (c != '*')
{
if (c == '\n')
source_lineno++, lineno++;
c = INF_GET ();
}
else if ((c = INF_GET ()) == '/')
return INF_GET ();
}
}
else
break;
}
return c;
}
/* Read into STR from inf_buffer upto DELIM. */
int
inf_read_upto (str, delim)
sstring *str;
int delim;
{
int ch;
for (;;)
{
ch = INF_GET ();
if (ch == EOF || ch == delim)
break;
SSTRING_PUT (str, ch);
}
MAKE_SSTRING_SPACE (str, 1);
*str->ptr = 0;
return ch;
}
int
inf_scan_ident (s, c)
register sstring *s;
int c;
{
s->ptr = s->base;
if (isalpha (c) || c == '_')
{
for (;;)
{
SSTRING_PUT (s, c);
c = INF_GET ();
if (c == EOF || !(isalnum (c) || c == '_'))
break;
}
}
MAKE_SSTRING_SPACE (s, 1);
*s->ptr = 0;
return c;
}
/* Returns 1 if the file is correctly protected against multiple
inclusion, setting *ifndef_line to the line number of the initial #ifndef
and setting *endif_line to the final #endif.
Otherwise return 0. */
int
check_protection (ifndef_line, endif_line)
int *ifndef_line, *endif_line;
{
int c;
int if_nesting = 1; /* Level of nesting of #if's */
char *protect_name = NULL; /* Identifier following initial #ifndef */
int define_seen = 0;
/* Skip initial white space (including comments). */
for (;; lineno++)
{
c = inf_skip_spaces (' ');
if (c == EOF)
return 0;
if (c != '\n')
break;
}
if (c != '#')
return 0;
c = inf_scan_ident (&buf, inf_skip_spaces (' '));
if (SSTRING_LENGTH (&buf) == 0 || strcmp (buf.base, "ifndef") != 0)
return 0;
/* So far so good: We've seen an initial #ifndef. */
*ifndef_line = lineno;
c = inf_scan_ident (&buf, inf_skip_spaces (c));
if (SSTRING_LENGTH (&buf) == 0 || c == EOF)
return 0;
protect_name = strdup (buf.base);
INF_UNGET (c);
c = inf_read_upto (&buf, '\n');
if (c == EOF)
return 0;
lineno++;
for (;;)
{
c = inf_skip_spaces (' ');
if (c == EOF)
return 0;
if (c == '\n')
{
lineno++;
continue;
}
if (c != '#')
goto skip_to_eol;
c = inf_scan_ident (&buf, inf_skip_spaces (' '));
if (SSTRING_LENGTH (&buf) == 0)
;
else if (!strcmp (buf.base, "ifndef")
|| !strcmp (buf.base, "ifdef") || !strcmp (buf.base, "if"))
{
if_nesting++;
}
else if (!strcmp (buf.base, "endif"))
{
if_nesting--;
if (if_nesting == 0)
break;
}
else if (!strcmp (buf.base, "else"))
{
if (if_nesting == 1)
return 0;
}
else if (!strcmp (buf.base, "define"))
{
if (if_nesting != 1)
goto skip_to_eol;
c = inf_skip_spaces (c);
c = inf_scan_ident (&buf, c);
if (buf.base[0] > 0 && strcmp (buf.base, protect_name) == 0)
define_seen = 1;
}
skip_to_eol:
for (;;)
{
if (c == '\n' || c == EOF)
break;
c = INF_GET ();
}
if (c == EOF)
return 0;
lineno++;
}
if (!define_seen)
return 0;
*endif_line = lineno;
/* Skip final white space (including comments). */
for (;;)
{
c = inf_skip_spaces (' ');
if (c == EOF)
break;
if (c != '\n')
return 0;
}
return 1;
}
int
main (argc, argv)
int argc;
char **argv;
{
int inf_fd;
struct stat sbuf;
int c;
int i, done;
char *cptr, *cptr0, **pptr;
int ifndef_line;
int endif_line;
long to_read;
long int inf_size;
if (argv[0] && argv[0][0])
{
register char *p;
progname = 0;
for (p = argv[0]; *p; p++)
if (*p == '/')
progname = p;
progname = progname ? progname+1 : argv[0];
}
if (argc < 4)
{
fprintf (stderr, "%s: Usage: foo.h infile.h outfile.h req_funcs <scan-file-name\n",
progname);
exit (-1);
}
inc_filename = argv[1];
inc_filename_length = strlen (inc_filename);
if (strcmp (inc_filename, "sys/stat.h") == 0)
special_file_handling = sys_stat_special;
else if (strcmp (inc_filename, "errno.h") == 0)
special_file_handling = errno_special, missing_errno = 1;
/* Calculate an upper bound of the number of function names in argv[4] */
for (i = 1, cptr = argv[4]; *cptr; cptr++)
if (*cptr == ' ') i++;
/* Find the list of prototypes required for this include file. */
required_functions = (char**)xmalloc ((i+1) * sizeof (char*));
for (cptr = argv[4], cptr0 = cptr, pptr = required_functions, done = 0;
!done; cptr++)
{
done = *cptr == '\0';
if (*cptr == ' ' || done)
{
*cptr = '\0';
if (cptr > cptr0)
{
struct fn_decl *fn = lookup_std_proto (cptr0);
*pptr++ = cptr0;
if (fn == NULL)
fprintf (stderr, "Internal error: No prototype for %s\n",
cptr0);
else
SET_REQUIRED (fn);
}
cptr0 = cptr + 1;
}
}
required_unseen_count = pptr - required_functions;
*pptr = 0;
read_scan_file (stdin);
inf_fd = open (argv[2], O_RDONLY, 0666);
if (inf_fd < 0)
{
fprintf (stderr, "%s: Cannot open '%s' for reading -",
progname, argv[2]);
perror (NULL);
exit (-1);
}
if (fstat (inf_fd, &sbuf) < 0)
{
fprintf (stderr, "%s: Cannot get size of '%s' -", progname, argv[2]);
perror (NULL);
exit (-1);
}
inf_size = sbuf.st_size;
inf_buffer = (char*) xmalloc (inf_size + 2);
inf_buffer[inf_size] = '\n';
inf_buffer[inf_size + 1] = '\0';
inf_limit = inf_buffer + inf_size;
inf_ptr = inf_buffer;
to_read = inf_size;
while (to_read > 0)
{
long i = read (inf_fd, inf_buffer + inf_size - to_read, to_read);
if (i < 0)
{
fprintf (stderr, "%s: Failed to read '%s' -", progname, argv[2]);
perror (NULL);
exit (-1);
}
if (i == 0)
{
inf_size -= to_read;
break;
}
to_read -= i;
}
close (inf_fd);
/* If file doesn't end with '\n', add one. */
if (inf_limit > inf_buffer && inf_limit[-1] != '\n')
inf_limit++;
unlink (argv[3]);
outf = fopen (argv[3], "w");
if (outf == NULL)
{
fprintf (stderr, "%s: Cannot open '%s' for writing -",
progname, argv[3]);
perror (NULL);
exit (-1);
}
lineno = 1;
if (check_protection (&ifndef_line, &endif_line))
{
#if 0
fprintf (stderr, "#ifndef %s on line %d; #endif on line %d\n",
protect_name, ifndef_line, endif_line);
#endif
lbrac_line = ifndef_line+1;
rbrac_line = endif_line;
}
else
{
lbrac_line = 1;
rbrac_line = -1;
}
/* Reset input file. */
inf_ptr = inf_buffer;
lineno = 1;
for (;;)
{
if (lineno == lbrac_line)
write_lbrac ();
if (lineno == rbrac_line)
write_rbrac ();
for (;;)
{
struct fn_decl *fn;
c = INF_GET ();
if (c == EOF)
break;
if (isalpha (c) || c == '_')
{
struct partial_proto *partial;
c = inf_scan_ident (&buf, c);
INF_UNGET (c);
fputs (buf.base, outf);
fn = lookup_std_proto (buf.base);
/* We only want to edit the declaration matching the one
seen by scan-decls, as there can be multiple
declarations, selected by #ifdef __STDC__ or whatever. */
if (fn && fn->partial && fn->partial->line_seen == lineno)
{
c = inf_skip_spaces (' ');
if (c == EOF)
break;
if (c == '(')
{
c = inf_skip_spaces (' ');
if (c == ')')
{
fprintf (outf, " _PARAMS((%s))", fn->params);
}
else
{
putc ('(', outf);
INF_UNGET (c);
}
}
else
fprintf (outf, " %c", c);
}
}
else
{
putc (c, outf);
if (c == '\n')
break;
}
}
if (c == EOF)
break;
lineno++;
}
if (rbrac_line < 0)
write_rbrac ();
fclose (outf);
return 0;
}
|
