/*
* build an input token..
* consider only those starting with _ or A-Za-z. This is a
* combo with lookup to speed things up.
*/
static ndptr
inspect(int c, char *tp)
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
unsigned int h;
h = *tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
h = (h << 5) + h + (*tp++ = c);
if (c != EOF)
PUTBACK(c);
*tp = EOS;
/* token is too long, it won't match anything, but it can still
* be output. */
if (tp == ep) {
outputstr(name);
while (isalnum(c = gpbc()) || c == '_') {
if (sp < 0)
putc(c, active);
else
CHRSAVE(c);
}
*name = EOS;
return nil;
}
for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
if (h == p->hv && STREQ(name, p->name))
break;
return p;
}
/*
* build an input token..
* consider only those starting with _ or A-Za-z.
*/
static ndptr
inspect(int c, char *tp)
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
*tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
*tp++ = c;
if (c != EOF)
PUSHBACK(c);
*tp = EOS;
/* token is too long, it won't match anything, but it can still
* be output. */
if (tp == ep) {
outputstr(name);
while (isalnum(c = gpbc()) || c == '_') {
if (sp < 0)
reallyputchar(c);
else
CHRSAVE(c);
}
*name = EOS;
return NULL;
}
p = ohash_find(¯os, ohash_qlookupi(¯os, name, (const char **)&tp));
if (p == NULL)
return NULL;
if (macro_getdef(p) == NULL)
return NULL;
return p;
}
/*
* Look ahead for `token'.
* (on input `t == token[0]')
* Used for comment and quoting delimiters.
* Returns 1 if `token' present; copied to output.
* 0 if `token' not found; all characters pushed back
*/
static int
do_look_ahead(int t, const char *token)
{
int i;
assert((unsigned char)t == (unsigned char)token[0]);
for (i = 1; *++token; i++) {
t = gpbc();
if (t == EOF || (unsigned char)t != (unsigned char)*token) {
putback(t);
while (--i)
putback(*--token);
return 0;
}
}
return 1;
}
/*
* expand_builtin - evaluate built-in macros.
*/
void
expand_builtin(const char *argv[], int argc, int td)
{
int c, n;
int ac;
static int sysval = 0;
#ifdef DEBUG
printf("argc = %d\n", argc);
for (n = 0; n < argc; n++)
printf("argv[%d] = %s\n", n, argv[n]);
fflush(stdout);
#endif
/*
* if argc == 3 and argv[2] is null, then we
* have macro-or-builtin() type call. We adjust
* argc to avoid further checking..
*/
/* we keep the initial value for those built-ins that differentiate
* between builtin() and builtin.
*/
ac = argc;
if (argc == 3 && !*(argv[2]) && !mimic_gnu)
argc--;
switch (td & TYPEMASK) {
case DEFITYPE:
if (argc > 2)
dodefine(argv[2], (argc > 3) ? argv[3] : null);
break;
case PUSDTYPE:
if (argc > 2)
dopushdef(argv[2], (argc > 3) ? argv[3] : null);
break;
case DUMPTYPE:
dodump(argv, argc);
break;
case TRACEONTYPE:
dotrace(argv, argc, 1);
break;
case TRACEOFFTYPE:
dotrace(argv, argc, 0);
break;
case EXPRTYPE:
/*
* doexpr - evaluate arithmetic
* expression
*/
{
int base = 10;
int maxdigits = 0;
const char *errstr;
if (argc > 3) {
base = strtonum(argv[3], 2, 36, &errstr);
if (errstr) {
m4errx(1, "expr: base %s invalid.", argv[3]);
}
}
if (argc > 4) {
maxdigits = strtonum(argv[4], 0, INT_MAX, &errstr);
if (errstr) {
m4errx(1, "expr: maxdigits %s invalid.", argv[4]);
}
}
if (argc > 2)
pbnumbase(expr(argv[2]), base, maxdigits);
break;
}
case IFELTYPE:
if (argc > 4)
doifelse(argv, argc);
break;
case IFDFTYPE:
/*
* doifdef - select one of two
* alternatives based on the existence of
* another definition
*/
if (argc > 3) {
if (lookup_macro_definition(argv[2]) != NULL)
pbstr(argv[3]);
else if (argc > 4)
pbstr(argv[4]);
}
break;
case LENGTYPE:
/*
* dolen - find the length of the
* argument
*/
pbnum((argc > 2) ? strlen(argv[2]) : 0);
break;
case INCRTYPE:
/*
* doincr - increment the value of the
* argument
*/
if (argc > 2)
pbnum(atoi(argv[2]) + 1);
break;
case DECRTYPE:
/*
* dodecr - decrement the value of the
* argument
*/
if (argc > 2)
pbnum(atoi(argv[2]) - 1);
break;
case SYSCTYPE:
/*
* dosys - execute system command
*/
if (argc > 2) {
fflush(stdout);
sysval = system(argv[2]);
}
break;
case SYSVTYPE:
/*
* dosysval - return value of the last
* system call.
*
*/
pbnum(sysval);
break;
case ESYSCMDTYPE:
if (argc > 2)
doesyscmd(argv[2]);
break;
case INCLTYPE:
if (argc > 2)
if (!doincl(argv[2])) {
if (mimic_gnu) {
warn("%s at line %lu: include(%s)",
CURRENT_NAME, CURRENT_LINE, argv[2]);
exit_code = 1;
} else
err(1, "%s at line %lu: include(%s)",
CURRENT_NAME, CURRENT_LINE, argv[2]);
}
break;
case SINCTYPE:
if (argc > 2)
(void) doincl(argv[2]);
break;
#ifdef EXTENDED
case PASTTYPE:
if (argc > 2)
if (!dopaste(argv[2]))
err(1, "%s at line %lu: paste(%s)",
CURRENT_NAME, CURRENT_LINE, argv[2]);
break;
case SPASTYPE:
if (argc > 2)
(void) dopaste(argv[2]);
break;
case FORMATTYPE:
doformat(argv, argc);
break;
#endif
case CHNQTYPE:
dochq(argv, ac);
break;
case CHNCTYPE:
dochc(argv, argc);
break;
case SUBSTYPE:
/*
* dosub - select substring
*
*/
if (argc > 3)
dosub(argv, argc);
break;
case SHIFTYPE:
/*
* doshift - push back all arguments
* except the first one (i.e. skip
* argv[2])
*/
if (argc > 3) {
for (n = argc - 1; n > 3; n--) {
pbstr(rquote);
pbstr(argv[n]);
pbstr(lquote);
pushback(COMMA);
}
pbstr(rquote);
pbstr(argv[3]);
pbstr(lquote);
}
break;
case DIVRTYPE:
if (argc > 2 && (n = atoi(argv[2])) != 0)
dodiv(n);
else {
active = stdout;
oindex = 0;
}
break;
case UNDVTYPE:
doundiv(argv, argc);
break;
case DIVNTYPE:
/*
* dodivnum - return the number of
* current output diversion
*/
pbnum(oindex);
break;
case UNDFTYPE:
/*
* doundefine - undefine a previously
* defined macro(s) or m4 keyword(s).
*/
if (argc > 2)
for (n = 2; n < argc; n++)
macro_undefine(argv[n]);
break;
case POPDTYPE:
/*
* dopopdef - remove the topmost
* definitions of macro(s) or m4
* keyword(s).
*/
if (argc > 2)
for (n = 2; n < argc; n++)
macro_popdef(argv[n]);
break;
case MKTMTYPE:
/*
* dotemp - create a temporary file
*/
if (argc > 2) {
int fd;
char *temp;
temp = xstrdup(argv[2]);
fd = mkstemp(temp);
if (fd == -1)
err(1,
"%s at line %lu: couldn't make temp file %s",
CURRENT_NAME, CURRENT_LINE, argv[2]);
close(fd);
pbstr(temp);
free(temp);
}
break;
case TRNLTYPE:
/*
* dotranslit - replace all characters in
* the source string that appears in the
* "from" string with the corresponding
* characters in the "to" string.
*/
if (argc > 3) {
char *temp;
temp = xalloc(strlen(argv[2])+1, NULL);
if (argc > 4)
map(temp, argv[2], argv[3], argv[4]);
else
map(temp, argv[2], argv[3], null);
pbstr(temp);
free(temp);
} else if (argc > 2)
pbstr(argv[2]);
break;
case INDXTYPE:
/*
* doindex - find the index of the second
* argument string in the first argument
* string. -1 if not present.
*/
pbnum((argc > 3) ? indx(argv[2], argv[3]) : -1);
break;
case ERRPTYPE:
/*
* doerrp - print the arguments to stderr
* file
*/
if (argc > 2) {
for (n = 2; n < argc; n++)
fprintf(stderr, "%s ", argv[n]);
fprintf(stderr, "\n");
}
break;
case DNLNTYPE:
/*
* dodnl - eat-up-to and including
* newline
*/
while ((c = gpbc()) != '\n' && c != EOF)
;
break;
case M4WRTYPE:
/*
* dom4wrap - set up for
* wrap-up/wind-down activity
*/
if (argc > 2)
dom4wrap(argv[2]);
break;
case EXITTYPE:
/*
* doexit - immediate exit from m4.
*/
killdiv();
exit((argc > 2) ? atoi(argv[2]) : 0);
break;
case DEFNTYPE:
if (argc > 2)
for (n = 2; n < argc; n++)
dodefn(argv[n]);
break;
case INDIRTYPE: /* Indirect call */
if (argc > 2)
doindir(argv, argc);
break;
case BUILTINTYPE: /* Builtins only */
if (argc > 2)
dobuiltin(argv, argc);
break;
case PATSTYPE:
if (argc > 2)
dopatsubst(argv, argc);
break;
case REGEXPTYPE:
if (argc > 2)
doregexp(argv, argc);
break;
case LINETYPE:
doprintlineno(infile+ilevel);
break;
case FILENAMETYPE:
doprintfilename(infile+ilevel);
break;
case SELFTYPE:
pbstr(rquote);
pbstr(argv[1]);
pbstr(lquote);
break;
default:
m4errx(1, "eval: major botch.");
break;
}
}
/*
* macro - the work horse..
*/
static void
macro(void)
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
cycle {
t = gpbc();
if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != nil)
putback(l = gpbc());
if (p == nil || (l != LPAREN &&
(p->type & NEEDARGS) != 0))
outputstr(token);
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(p->type); /* type of the call */
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs1(p->defn); /* defn string */
pushs1(p->name); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if ((uintptr_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (sp > -1) {
warnx( "unexpected end of input, unclosed parenthesis:");
dump_stack(paren, PARLEV);
exit(1);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
free(inname[ilevel+1]);
bufbase = bbase[ilevel];
emitline();
continue;
}
/*
* non-alpha token possibly seen..
* [the order of else if .. stmts is important.]
*/
else if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
nlpar = 0;
record(quotes, nlpar++);
/*
* Opening quote: scan forward until matching
* closing quote has been found.
*/
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
if (--nlpar > 0)
outputstr(rquote);
} else if (LOOK_AHEAD(l,lquote)) {
record(quotes, nlpar++);
outputstr(lquote);
} else if (l == EOF) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx("%d unclosed quotes:", nlpar);
dump_stack(quotes, nlpar);
exit(1);
} else {
if (nlpar > 0) {
if (sp < 0)
putc(l, active);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
}
else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
fputs(scommt, active);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
fputs(ecommt, active);
break;
}
if (t == EOF)
break;
putc(t, active);
}
}
else if (sp < 0) { /* not in a macro at all */
putc(t, active); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc()))
; /* skip blank, tab, nl.. */
putback(l);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if ((uintptr_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, sp-fp,
CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
break;
case COMMA:
if (PARLEV == 1) {
chrsave(EOS); /* new argument */
while (isspace(l = gpbc()))
;
putback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
if (LOOK_AHEAD(t, scommt)) {
char *pc;
for (pc = scommt; *pc; pc++)
chrsave(*pc);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (pc = ecommt; *pc; pc++)
chrsave(*pc);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
/*
* macro - the work horse..
*/
static void
macro(void)
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
cycle {
t = gpbc();
if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
nlpar = 0;
record(quotes, nlpar++);
/*
* Opening quote: scan forward until matching
* closing quote has been found.
*/
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
if (--nlpar > 0)
outputstr(rquote);
} else if (LOOK_AHEAD(l,lquote)) {
record(quotes, nlpar++);
outputstr(lquote);
} else if (l == EOF) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx("%d unclosed quotes:", nlpar);
dump_stack(quotes, nlpar);
exit(1);
} else {
if (nlpar > 0) {
if (sp < 0)
reallyputchar(l);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
} else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
reallyoutputstr(scommt);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
reallyoutputstr(ecommt);
break;
}
if (t == EOF)
break;
reallyputchar(t);
}
} else if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != NULL)
pushback(l = gpbc());
if (p == NULL || (l != LPAREN &&
(macro_getdef(p)->type & NEEDARGS) != 0))
outputstr(token);
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(macro_getdef(p)->type); /* type of the call */
pushf(is_traced(p));
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs1(macro_getdef(p)->defn); /* defn string */
pushs1((char *)macro_name(p)); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if (sp == (int)STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP, TRACESTATUS);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (!mimic_gnu /* you can puke right there */
&& sp > -1 && ilevel <= 0) {
warnx( "unexpected end of input, unclosed parenthesis:");
dump_stack(paren, PARLEV);
exit(1);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
emit_synchline();
bufbase = bbase[ilevel];
continue;
} else if (sp < 0) { /* not in a macro at all */
reallyputchar(t); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc())) /* skip blank, tab, nl.. */
if (PARLEV > 0)
chrsave(l);
pushback(l);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if (sp == (int)STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, sp-fp,
CALTYP, TRACESTATUS);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
break;
case COMMA:
if (PARLEV == 1) {
chrsave(EOS); /* new argument */
while (isspace(l = gpbc()))
;
pushback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
if (LOOK_AHEAD(t, scommt)) {
char *cp;
for (cp = scommt; *cp; cp++)
chrsave(*cp);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (cp = ecommt; *cp; cp++)
chrsave(*cp);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
