/** Splits the chain in order to write to a header file.
* Similar in spirit to the 'tee' program.
* The header file name is in extra.
* @return 0 (zero) on success, and -1 on failure.
*/
int filter_tee_header (struct filter *chain)
{
/* This function reads from stdin and writes to both the C file and the
* header file at the same time.
*/
const int readsz = 512;
char *buf;
int to_cfd = -1;
FILE *to_c = NULL, *to_h = NULL;
bool write_header;
write_header = (chain->extra != NULL);
/* Store a copy of the stdout pipe, which is already piped to C file
* through the running chain. Then create a new pipe to the H file as
* stdout, and fork the rest of the chain again.
*/
if ((to_cfd = dup (1)) == -1)
flexfatal (_("dup(1) failed"));
to_c = fdopen (to_cfd, "w");
if (write_header) {
if (freopen ((char *) chain->extra, "w", stdout) == NULL)
flexfatal (_("freopen(headerfilename) failed"));
filter_apply_chain (chain->next);
to_h = stdout;
}
/* Now to_c is a pipe to the C branch, and to_h is a pipe to the H branch.
*/
if (write_header) {
fputs (check_4_gnu_m4, to_h);
fputs ("m4_changecom`'m4_dnl\n", to_h);
fputs ("m4_changequote`'m4_dnl\n", to_h);
fputs ("m4_changequote([[,]])[[]]m4_dnl\n", to_h);
fputs ("m4_define([[M4_YY_NOOP]])[[]]m4_dnl\n", to_h);
fputs ("m4_define( [[M4_YY_IN_HEADER]],[[]])m4_dnl\n",
to_h);
fprintf (to_h, "#ifndef %sHEADER_H\n", prefix);
fprintf (to_h, "#define %sHEADER_H 1\n", prefix);
fprintf (to_h, "#define %sIN_HEADER 1\n\n", prefix);
fprintf (to_h,
"m4_define( [[M4_YY_OUTFILE_NAME]],[[%s]])m4_dnl\n",
headerfilename ? headerfilename : "<stdout>");
}
fputs (check_4_gnu_m4, to_c);
fputs ("m4_changecom`'m4_dnl\n", to_c);
fputs ("m4_changequote`'m4_dnl\n", to_c);
fputs ("m4_changequote([[,]])[[]]m4_dnl\n", to_c);
fputs ("m4_define([[M4_YY_NOOP]])[[]]m4_dnl\n", to_c);
fprintf (to_c, "m4_define( [[M4_YY_OUTFILE_NAME]],[[%s]])m4_dnl\n",
outfilename ? outfilename : "<stdout>");
buf = malloc(readsz);
if (!buf)
flexerror(_("malloc failed in filter_tee_header"));
while (fgets (buf, readsz, stdin)) {
fputs (buf, to_c);
if (write_header)
fputs (buf, to_h);
}
if (write_header) {
fprintf (to_h, "\n");
/* write a fake line number. It will get fixed by the linedir filter. */
fprintf (to_h, "#line 4000 \"M4_YY_OUTFILE_NAME\"\n");
fprintf (to_h, "#undef %sIN_HEADER\n", prefix);
fprintf (to_h, "#endif /* %sHEADER_H */\n", prefix);
fputs ("m4_undefine( [[M4_YY_IN_HEADER]])m4_dnl\n", to_h);
fflush (to_h);
if (ferror (to_h))
lerr (_("error writing output file %s"),
(char *) chain->extra);
else if (fclose (to_h))
lerr (_("error closing output file %s"),
(char *) chain->extra);
}
fflush (to_c);
if (ferror (to_c))
lerr (_("error writing output file %s"),
outfilename ? outfilename : "<stdout>");
else if (fclose (to_c))
lerr (_("error closing output file %s"),
outfilename ? outfilename : "<stdout>");
while (wait (0) > 0) ;
exit (0);
return 0;
}
/** Fork and exec entire filter chain.
* @param chain The head of the chain.
* @return true on success.
*/
bool
filter_apply_chain(struct filter * chain)
{
int pid, pipes[2];
int r;
const int readsz = 512;
char *buf;
/*
* Tricky recursion, since we want to begin the chain at the END.
* Why? Because we need all the forked processes to be children of
* the main flex process.
*/
if (chain)
filter_apply_chain(chain->next);
else
return true;
/*
* Now we are the right-most unprocessed link in the chain.
*/
fflush(stdout);
fflush(stderr);
if (pipe(pipes) == -1)
flexerror(_("pipe failed"));
if ((pid = fork()) == -1)
flexerror(_("fork failed"));
if (pid == 0) {
/* child */
/*
* We need stdin (the FILE* stdin) to connect to this new
* pipe. There is no portable way to set stdin to a new file
* descriptor, as stdin is not an lvalue on some systems
* (BSD). So we dup the new pipe onto the stdin descriptor
* and use a no-op fseek to sync the stream. This is a Hail
* Mary situation. It seems to work.
*/
close(pipes[1]);
clearerr(stdin);
if (dup2(pipes[0], fileno(stdin)) == -1)
flexfatal(_("dup2(pipes[0],0)"));
close(pipes[0]);
fseek(stdin, 0, SEEK_CUR);
/* run as a filter, either internally or by exec */
if (chain->filter_func) {
int r;
if ((r = chain->filter_func(chain)) == -1)
flexfatal(_("filter_func failed"));
exit(0);
} else {
execvp(chain->argv[0],
(char **const) (chain->argv));
lerrsf_fatal(_("exec of %s failed"),
chain->argv[0]);
}
exit(1);
}
/* Parent */
close(pipes[0]);
if (dup2(pipes[1], fileno(stdout)) == -1)
flexfatal(_("dup2(pipes[1],1)"));
close(pipes[1]);
fseek(stdout, 0, SEEK_CUR);
return true;
}
/** Fork and exec entire filter chain.
* @param chain The head of the chain.
* @return true on success.
*/
bool filter_apply_chain (struct filter * chain)
{
int pid, pipes[2];
/* Tricky recursion, since we want to begin the chain
* at the END. Why? Because we need all the forked processes
* to be children of the main flex process.
*/
if (chain)
filter_apply_chain (chain->next);
else
return true;
/* Now we are the right-most unprocessed link in the chain.
*/
fflush (stdout);
fflush (stderr);
if (pipe (pipes) == -1)
flexerror (_("pipe failed"));
if ((pid = fork ()) == -1)
flexerror (_("fork failed"));
if (pid == 0) {
/* child */
/* We need stdin (the FILE* stdin) to connect to this new pipe.
* There is no portable way to set stdin to a new file descriptor,
* as stdin is not an lvalue on some systems (BSD).
* So we dup the new pipe onto the stdin descriptor and use a no-op fseek
* to sync the stream. This is a Hail Mary situation. It seems to work.
*/
close (pipes[1]);
clearerr(stdin);
if (dup2 (pipes[0], fileno (stdin)) == -1)
flexfatal (_("dup2(pipes[0],0)"));
close (pipes[0]);
fseek (stdin, 0, SEEK_CUR);
ungetc(' ', stdin); /* still an evil hack, but one that works better */
(void)fgetc(stdin); /* on NetBSD than the fseek attempt does */
/* run as a filter, either internally or by exec */
if (chain->filter_func) {
int r;
if ((r = chain->filter_func (chain)) == -1)
flexfatal (_("filter_func failed"));
exit (0);
}
else {
execvp (chain->argv[0],
(char **const) (chain->argv));
lerr_fatal ( _("exec of %s failed"),
chain->argv[0]);
}
exit (1);
}
/* Parent */
close (pipes[0]);
if (dup2 (pipes[1], fileno (stdout)) == -1)
flexfatal (_("dup2(pipes[1],1)"));
close (pipes[1]);
fseek (stdout, 0, SEEK_CUR);
return true;
}
void check_options (void)
{
int i;
const char * m4 = NULL;
if (lex_compat) {
if (C_plus_plus)
flexerror (_("Can't use -+ with -l option"));
if (fulltbl || fullspd)
flexerror (_("Can't use -f or -F with -l option"));
if (reentrant || bison_bridge_lval)
flexerror (_
("Can't use --reentrant or --bison-bridge with -l option"));
yytext_is_array = true;
do_yylineno = true;
use_read = false;
}
#if 0
/* This makes no sense whatsoever. I'm removing it. */
if (do_yylineno)
/* This should really be "maintain_backup_tables = true" */
reject_really_used = true;
#endif
if (csize == unspecified) {
if ((fulltbl || fullspd) && !useecs)
csize = DEFAULT_CSIZE;
else
csize = CSIZE;
}
if (interactive == unspecified) {
if (fulltbl || fullspd)
interactive = false;
else
interactive = true;
}
if (fulltbl || fullspd) {
if (usemecs)
flexerror (_
("-Cf/-CF and -Cm don't make sense together"));
if (interactive)
flexerror (_("-Cf/-CF and -I are incompatible"));
if (lex_compat)
flexerror (_
("-Cf/-CF are incompatible with lex-compatibility mode"));
if (fulltbl && fullspd)
flexerror (_
("-Cf and -CF are mutually exclusive"));
}
if (C_plus_plus && fullspd)
flexerror (_("Can't use -+ with -CF option"));
if (C_plus_plus && yytext_is_array) {
lwarn (_("%array incompatible with -+ option"));
yytext_is_array = false;
}
if (C_plus_plus && (reentrant))
flexerror (_("Options -+ and --reentrant are mutually exclusive."));
if (C_plus_plus && bison_bridge_lval)
flexerror (_("bison bridge not supported for the C++ scanner."));
if (useecs) { /* Set up doubly-linked equivalence classes. */
/* We loop all the way up to csize, since ecgroup[csize] is
* the position used for NUL characters.
*/
ecgroup[1] = NIL;
for (i = 2; i <= csize; ++i) {
ecgroup[i] = i - 1;
nextecm[i - 1] = i;
}
nextecm[csize] = NIL;
}
else {
/* Put everything in its own equivalence class. */
for (i = 1; i <= csize; ++i) {
ecgroup[i] = i;
nextecm[i] = BAD_SUBSCRIPT; /* to catch errors */
}
}
if (extra_type)
buf_m4_define( &m4defs_buf, "M4_EXTRA_TYPE_DEFS", extra_type);
if (!use_stdout) {
FILE *prev_stdout;
if (!did_outfilename) {
char *suffix;
if (C_plus_plus)
suffix = "cc";
else
suffix = "c";
snprintf (outfile_path, sizeof(outfile_path), outfile_template,
prefix, suffix);
outfilename = outfile_path;
}
prev_stdout = freopen (outfilename, "w+", stdout);
if (prev_stdout == NULL)
lerr (_("could not create %s"), outfilename);
outfile_created = 1;
}
/* Setup the filter chain. */
output_chain = filter_create_int(NULL, filter_tee_header, headerfilename);
if ( !(m4 = getenv("M4"))) {
char *slash;
m4 = M4;
if ((slash = strrchr(M4, '/')) != NULL) {
m4 = slash+1;
/* break up $PATH */
const char *path = getenv("PATH");
if (!path) {
m4 = M4;
} else {
int m4_length = strlen(m4);
do {
size_t length = strlen(path);
struct stat sbuf;
const char *endOfDir = strchr(path, ':');
if (!endOfDir)
endOfDir = path+length;
{
char *m4_path = calloc(endOfDir-path + 1 + m4_length + 1, 1);
memcpy(m4_path, path, endOfDir-path);
m4_path[endOfDir-path] = '/';
memcpy(m4_path + (endOfDir-path) + 1, m4, m4_length + 1);
if (stat(m4_path, &sbuf) == 0 &&
(S_ISREG(sbuf.st_mode)) && sbuf.st_mode & S_IXUSR) {
m4 = m4_path;
break;
}
free(m4_path);
}
path = endOfDir+1;
} while (path[0]);
if (!path[0])
m4 = M4;
}
}
}
filter_create_ext(output_chain, m4, "-P", 0);
filter_create_int(output_chain, filter_fix_linedirs, NULL);
/* For debugging, only run the requested number of filters. */
if (preproc_level > 0) {
filter_truncate(output_chain, preproc_level);
filter_apply_chain(output_chain);
}
yyout = stdout;
/* always generate the tablesverify flag. */
buf_m4_define (&m4defs_buf, "M4_YY_TABLES_VERIFY", tablesverify ? "1" : "0");
if (tablesext)
gentables = false;
if (tablesverify)
/* force generation of C tables. */
gentables = true;
if (tablesext) {
FILE *tablesout;
struct yytbl_hdr hdr;
char *pname = 0;
size_t nbytes = 0;
buf_m4_define (&m4defs_buf, "M4_YY_TABLES_EXTERNAL", NULL);
if (!tablesfilename) {
nbytes = strlen (prefix) + strlen (tablesfile_template) + 2;
tablesfilename = pname = calloc(nbytes, 1);
snprintf (pname, nbytes, tablesfile_template, prefix);
}
if ((tablesout = fopen (tablesfilename, "w")) == NULL)
lerr (_("could not create %s"), tablesfilename);
free(pname);
tablesfilename = 0;
yytbl_writer_init (&tableswr, tablesout);
nbytes = strlen (prefix) + strlen ("tables") + 2;
tablesname = calloc(nbytes, 1);
snprintf (tablesname, nbytes, "%stables", prefix);
yytbl_hdr_init (&hdr, flex_version, tablesname);
if (yytbl_hdr_fwrite (&tableswr, &hdr) <= 0)
flexerror (_("could not write tables header"));
}
if (skelname && (skelfile = fopen (skelname, "r")) == NULL)
lerr (_("can't open skeleton file %s"), skelname);
if (reentrant) {
buf_m4_define (&m4defs_buf, "M4_YY_REENTRANT", NULL);
if (yytext_is_array)
buf_m4_define (&m4defs_buf, "M4_YY_TEXT_IS_ARRAY", NULL);
}
if ( bison_bridge_lval)
buf_m4_define (&m4defs_buf, "M4_YY_BISON_LVAL", NULL);
if ( bison_bridge_lloc)
buf_m4_define (&m4defs_buf, "<M4_YY_BISON_LLOC>", NULL);
if (strchr(prefix, '[') || strchr(prefix, ']'))
flexerror(_("Prefix cannot include '[' or ']'"));
buf_m4_define(&m4defs_buf, "M4_YY_PREFIX", prefix);
if (did_outfilename)
line_directive_out (stdout, 0);
if (do_yylineno)
buf_m4_define (&m4defs_buf, "M4_YY_USE_LINENO", NULL);
/* Create the alignment type. */
buf_strdefine (&userdef_buf, "YY_INT_ALIGNED",
long_align ? "long int" : "short int");
/* Define the start condition macros. */
{
struct Buf tmpbuf;
buf_init(&tmpbuf, sizeof(char));
for (i = 1; i <= lastsc; i++) {
char *str, *fmt = "#define %s %d\n";
size_t strsz;
strsz = strlen(fmt) + strlen(scname[i]) + (size_t)(1 + ceil (log10(i))) + 2;
str = malloc(strsz);
if (!str)
flexfatal(_("allocation of macro definition failed"));
snprintf(str, strsz, fmt, scname[i], i - 1);
buf_strappend(&tmpbuf, str);
free(str);
}
buf_m4_define(&m4defs_buf, "M4_YY_SC_DEFS", tmpbuf.elts);
buf_destroy(&tmpbuf);
}
/* This is where we begin writing to the file. */
/* Dump the %top code. */
if( top_buf.elts)
outn((char*) top_buf.elts);
/* Dump the m4 definitions. */
buf_print_strings(&m4defs_buf, stdout);
m4defs_buf.nelts = 0; /* memory leak here. */
/* Place a bogus line directive, it will be fixed in the filter. */
if (gen_line_dirs)
outn("#line 0 \"M4_YY_OUTFILE_NAME\"\n");
/* Dump the user defined preproc directives. */
if (userdef_buf.elts)
outn ((char *) (userdef_buf.elts));
skelout ();
/* %% [1.0] */
}
